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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /Documentation/driver-api
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'Documentation/driver-api')
-rw-r--r--Documentation/driver-api/80211/cfg80211.rst178
-rw-r--r--Documentation/driver-api/80211/index.rst17
-rw-r--r--Documentation/driver-api/80211/introduction.rst17
-rw-r--r--Documentation/driver-api/80211/mac80211-advanced.rst239
-rw-r--r--Documentation/driver-api/80211/mac80211.rst155
-rw-r--r--Documentation/driver-api/acpi/index.rst9
-rw-r--r--Documentation/driver-api/acpi/linuxized-acpica.rst279
-rw-r--r--Documentation/driver-api/acpi/scan_handlers.rst83
-rw-r--r--Documentation/driver-api/aperture.rst13
-rw-r--r--Documentation/driver-api/auxiliary_bus.rst50
-rw-r--r--Documentation/driver-api/backlight/lp855x-driver.rst81
-rw-r--r--Documentation/driver-api/basics.rst130
-rw-r--r--Documentation/driver-api/clk.rst312
-rw-r--r--Documentation/driver-api/component.rst19
-rw-r--r--Documentation/driver-api/connector.rst157
-rw-r--r--Documentation/driver-api/console.rst152
-rw-r--r--Documentation/driver-api/cxl/index.rst12
-rw-r--r--Documentation/driver-api/cxl/memory-devices.rst383
-rw-r--r--Documentation/driver-api/dcdbas.rst99
-rw-r--r--Documentation/driver-api/devfreq.rst30
-rw-r--r--Documentation/driver-api/device-io.rst521
-rw-r--r--Documentation/driver-api/device_link.rst320
-rw-r--r--Documentation/driver-api/dma-buf.rst366
-rw-r--r--Documentation/driver-api/dmaengine/client.rst379
-rw-r--r--Documentation/driver-api/dmaengine/dmatest.rst232
-rw-r--r--Documentation/driver-api/dmaengine/index.rst55
-rw-r--r--Documentation/driver-api/dmaengine/provider.rst647
-rw-r--r--Documentation/driver-api/dmaengine/pxa_dma.rst190
-rw-r--r--Documentation/driver-api/driver-model/binding.rst98
-rw-r--r--Documentation/driver-api/driver-model/bus.rst146
-rw-r--r--Documentation/driver-api/driver-model/design-patterns.rst116
-rw-r--r--Documentation/driver-api/driver-model/device.rst120
-rw-r--r--Documentation/driver-api/driver-model/devres.rst462
-rw-r--r--Documentation/driver-api/driver-model/driver.rst286
-rw-r--r--Documentation/driver-api/driver-model/index.rst23
-rw-r--r--Documentation/driver-api/driver-model/overview.rst124
-rw-r--r--Documentation/driver-api/driver-model/platform.rst246
-rw-r--r--Documentation/driver-api/driver-model/porting.rst448
-rw-r--r--Documentation/driver-api/early-userspace/buffer-format.rst119
-rw-r--r--Documentation/driver-api/early-userspace/early_userspace_support.rst154
-rw-r--r--Documentation/driver-api/early-userspace/index.rst18
-rw-r--r--Documentation/driver-api/edac.rst298
-rw-r--r--Documentation/driver-api/eisa.rst230
-rw-r--r--Documentation/driver-api/firewire.rst48
-rw-r--r--Documentation/driver-api/firmware/built-in-fw.rst33
-rw-r--r--Documentation/driver-api/firmware/core.rst17
-rw-r--r--Documentation/driver-api/firmware/direct-fs-lookup.rst30
-rw-r--r--Documentation/driver-api/firmware/efi/index.rst11
-rw-r--r--Documentation/driver-api/firmware/fallback-mechanisms.rst308
-rw-r--r--Documentation/driver-api/firmware/firmware-usage-guidelines.rst44
-rw-r--r--Documentation/driver-api/firmware/firmware_cache.rst51
-rw-r--r--Documentation/driver-api/firmware/fw_search_path.rst31
-rw-r--r--Documentation/driver-api/firmware/fw_upload.rst127
-rw-r--r--Documentation/driver-api/firmware/index.rst19
-rw-r--r--Documentation/driver-api/firmware/introduction.rst27
-rw-r--r--Documentation/driver-api/firmware/lookup-order.rst20
-rw-r--r--Documentation/driver-api/firmware/other_interfaces.rst51
-rw-r--r--Documentation/driver-api/firmware/request_firmware.rst80
-rw-r--r--Documentation/driver-api/fpga/fpga-bridge.rst22
-rw-r--r--Documentation/driver-api/fpga/fpga-mgr.rst162
-rw-r--r--Documentation/driver-api/fpga/fpga-programming.rst107
-rw-r--r--Documentation/driver-api/fpga/fpga-region.rst109
-rw-r--r--Documentation/driver-api/fpga/index.rst15
-rw-r--r--Documentation/driver-api/fpga/intro.rst54
-rw-r--r--Documentation/driver-api/frame-buffer.rst62
-rw-r--r--Documentation/driver-api/generic-counter.rst573
-rw-r--r--Documentation/driver-api/gpio/board.rst222
-rw-r--r--Documentation/driver-api/gpio/bt8xxgpio.rst62
-rw-r--r--Documentation/driver-api/gpio/consumer.rst468
-rw-r--r--Documentation/driver-api/gpio/driver.rst778
-rw-r--r--Documentation/driver-api/gpio/drivers-on-gpio.rst114
-rw-r--r--Documentation/driver-api/gpio/index.rst50
-rw-r--r--Documentation/driver-api/gpio/intro.rst124
-rw-r--r--Documentation/driver-api/gpio/legacy.rst695
-rw-r--r--Documentation/driver-api/gpio/using-gpio.rst50
-rw-r--r--Documentation/driver-api/hsi.rst88
-rw-r--r--Documentation/driver-api/hte/hte.rst79
-rw-r--r--Documentation/driver-api/hte/index.rst22
-rw-r--r--Documentation/driver-api/hte/tegra-hte.rst47
-rw-r--r--Documentation/driver-api/i2c.rst48
-rw-r--r--Documentation/driver-api/i3c/device-driver-api.rst9
-rw-r--r--Documentation/driver-api/i3c/index.rst11
-rw-r--r--Documentation/driver-api/i3c/master-driver-api.rst9
-rw-r--r--Documentation/driver-api/i3c/protocol.rst203
-rw-r--r--Documentation/driver-api/iio/buffers.rst126
-rw-r--r--Documentation/driver-api/iio/core.rst182
-rw-r--r--Documentation/driver-api/iio/hw-consumer.rst50
-rw-r--r--Documentation/driver-api/iio/index.rst18
-rw-r--r--Documentation/driver-api/iio/intro.rst33
-rw-r--r--Documentation/driver-api/iio/triggered-buffers.rst69
-rw-r--r--Documentation/driver-api/iio/triggers.rst78
-rw-r--r--Documentation/driver-api/index.rst123
-rw-r--r--Documentation/driver-api/infiniband.rst124
-rw-r--r--Documentation/driver-api/infrastructure.rst97
-rw-r--r--Documentation/driver-api/input.rst42
-rw-r--r--Documentation/driver-api/interconnect.rst140
-rw-r--r--Documentation/driver-api/io-mapping.rst91
-rw-r--r--Documentation/driver-api/io_ordering.rst51
-rw-r--r--Documentation/driver-api/ioctl.rst253
-rw-r--r--Documentation/driver-api/ipmb.rst109
-rw-r--r--Documentation/driver-api/ipmi.rst810
-rw-r--r--Documentation/driver-api/isa.rst122
-rw-r--r--Documentation/driver-api/isapnp.rst15
-rw-r--r--Documentation/driver-api/libata.rst993
-rw-r--r--Documentation/driver-api/mailbox.rst129
-rw-r--r--Documentation/driver-api/md/index.rst12
-rw-r--r--Documentation/driver-api/md/md-cluster.rst385
-rw-r--r--Documentation/driver-api/md/raid5-cache.rst111
-rw-r--r--Documentation/driver-api/md/raid5-ppl.rst47
-rw-r--r--Documentation/driver-api/media/camera-sensor.rst175
-rw-r--r--Documentation/driver-api/media/cec-core.rst502
-rw-r--r--Documentation/driver-api/media/drivers/bttv-devel.rst116
-rw-r--r--Documentation/driver-api/media/drivers/ccs/ccs-regs.asc1041
-rw-r--r--Documentation/driver-api/media/drivers/ccs/ccs.rst117
-rwxr-xr-xDocumentation/driver-api/media/drivers/ccs/mk-ccs-regs434
-rw-r--r--Documentation/driver-api/media/drivers/contributors.rst131
-rw-r--r--Documentation/driver-api/media/drivers/cx2341x-devel.rst3685
-rw-r--r--Documentation/driver-api/media/drivers/cx88-devel.rst113
-rw-r--r--Documentation/driver-api/media/drivers/dvb-usb.rst357
-rw-r--r--Documentation/driver-api/media/drivers/fimc-devel.rst33
-rw-r--r--Documentation/driver-api/media/drivers/frontends.rst32
-rw-r--r--Documentation/driver-api/media/drivers/index.rst40
-rw-r--r--Documentation/driver-api/media/drivers/pvrusb2.rst202
-rw-r--r--Documentation/driver-api/media/drivers/pxa_camera.rst194
-rw-r--r--Documentation/driver-api/media/drivers/radiotrack.rst168
-rw-r--r--Documentation/driver-api/media/drivers/rkisp1.rst43
-rw-r--r--Documentation/driver-api/media/drivers/saa7134-devel.rst67
-rw-r--r--Documentation/driver-api/media/drivers/sh_mobile_ceu_camera.rst142
-rw-r--r--Documentation/driver-api/media/drivers/tuners.rst133
-rw-r--r--Documentation/driver-api/media/drivers/vidtv.rst513
-rw-r--r--Documentation/driver-api/media/drivers/vimc-devel.rst15
-rw-r--r--Documentation/driver-api/media/drivers/zoran.rst575
-rw-r--r--Documentation/driver-api/media/dtv-ca.rst6
-rw-r--r--Documentation/driver-api/media/dtv-common.rst53
-rw-r--r--Documentation/driver-api/media/dtv-core.rst39
-rw-r--r--Documentation/driver-api/media/dtv-demux.rst84
-rw-r--r--Documentation/driver-api/media/dtv-frontend.rst445
-rw-r--r--Documentation/driver-api/media/dtv-net.rst6
-rw-r--r--Documentation/driver-api/media/index.rst59
-rw-r--r--Documentation/driver-api/media/maintainer-entry-profile.rst206
-rw-r--r--Documentation/driver-api/media/mc-core.rst326
-rw-r--r--Documentation/driver-api/media/rc-core.rst88
-rw-r--r--Documentation/driver-api/media/tx-rx.rst133
-rw-r--r--Documentation/driver-api/media/v4l2-async.rst5
-rw-r--r--Documentation/driver-api/media/v4l2-cci.rst5
-rw-r--r--Documentation/driver-api/media/v4l2-common.rst8
-rw-r--r--Documentation/driver-api/media/v4l2-controls.rst823
-rw-r--r--Documentation/driver-api/media/v4l2-core.rst29
-rw-r--r--Documentation/driver-api/media/v4l2-dev.rst375
-rw-r--r--Documentation/driver-api/media/v4l2-device.rst146
-rw-r--r--Documentation/driver-api/media/v4l2-dv-timings.rst6
-rw-r--r--Documentation/driver-api/media/v4l2-event.rst181
-rw-r--r--Documentation/driver-api/media/v4l2-fh.rst141
-rw-r--r--Documentation/driver-api/media/v4l2-flash-led-class.rst6
-rw-r--r--Documentation/driver-api/media/v4l2-fwnode.rst5
-rw-r--r--Documentation/driver-api/media/v4l2-intro.rst76
-rw-r--r--Documentation/driver-api/media/v4l2-mc.rst6
-rw-r--r--Documentation/driver-api/media/v4l2-mediabus.rst6
-rw-r--r--Documentation/driver-api/media/v4l2-mem2mem.rst6
-rw-r--r--Documentation/driver-api/media/v4l2-rect.rst6
-rw-r--r--Documentation/driver-api/media/v4l2-subdev.rst637
-rw-r--r--Documentation/driver-api/media/v4l2-tuner.rst8
-rw-r--r--Documentation/driver-api/media/v4l2-tveeprom.rst6
-rw-r--r--Documentation/driver-api/media/v4l2-videobuf.rst403
-rw-r--r--Documentation/driver-api/media/v4l2-videobuf2.rst12
-rw-r--r--Documentation/driver-api/mei/hdcp.rst32
-rw-r--r--Documentation/driver-api/mei/iamt.rst101
-rw-r--r--Documentation/driver-api/mei/index.rst23
-rw-r--r--Documentation/driver-api/mei/mei-client-bus.rst168
-rw-r--r--Documentation/driver-api/mei/mei.rst213
-rw-r--r--Documentation/driver-api/mei/nfc.rst28
-rw-r--r--Documentation/driver-api/memory-devices/index.rst18
-rw-r--r--Documentation/driver-api/memory-devices/ti-emif.rst64
-rw-r--r--Documentation/driver-api/memory-devices/ti-gpmc.rst179
-rw-r--r--Documentation/driver-api/men-chameleon-bus.rst187
-rw-r--r--Documentation/driver-api/message-based.rst12
-rw-r--r--Documentation/driver-api/misc_devices.rst5
-rw-r--r--Documentation/driver-api/miscellaneous.rst48
-rw-r--r--Documentation/driver-api/mmc/index.rst13
-rw-r--r--Documentation/driver-api/mmc/mmc-async-req.rst98
-rw-r--r--Documentation/driver-api/mmc/mmc-dev-attrs.rst91
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-rw-r--r--Documentation/driver-api/mmc/mmc-tools.rst37
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-rw-r--r--Documentation/driver-api/mtd/nand_ecc.rst763
-rw-r--r--Documentation/driver-api/mtd/spi-intel.rst90
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-rw-r--r--Documentation/driver-api/phy/index.rst18
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-rw-r--r--Documentation/driver-api/phy/samsung-usb2.rst137
-rw-r--r--Documentation/driver-api/pin-control.rst1455
-rw-r--r--Documentation/driver-api/pldmfw/driver-ops.rst56
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-rw-r--r--Documentation/driver-api/pm/cpuidle.rst279
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diff --git a/Documentation/driver-api/80211/cfg80211.rst b/Documentation/driver-api/80211/cfg80211.rst
new file mode 100644
index 0000000000..836f609c3f
--- /dev/null
+++ b/Documentation/driver-api/80211/cfg80211.rst
@@ -0,0 +1,178 @@
+==================
+cfg80211 subsystem
+==================
+
+.. kernel-doc:: include/net/cfg80211.h
+ :doc: Introduction
+
+Device registration
+===================
+
+.. kernel-doc:: include/net/cfg80211.h
+ :doc: Device registration
+
+.. kernel-doc:: include/net/cfg80211.h
+ :functions:
+ ieee80211_channel_flags
+ ieee80211_channel
+ ieee80211_rate_flags
+ ieee80211_rate
+ ieee80211_sta_ht_cap
+ ieee80211_supported_band
+ cfg80211_signal_type
+ wiphy_params_flags
+ wiphy_flags
+ wiphy
+ wireless_dev
+ wiphy_new
+ wiphy_read_of_freq_limits
+ wiphy_register
+ wiphy_unregister
+ wiphy_free
+ wiphy_name
+ wiphy_dev
+ wiphy_priv
+ priv_to_wiphy
+ set_wiphy_dev
+ wdev_priv
+ ieee80211_iface_limit
+ ieee80211_iface_combination
+ cfg80211_check_combinations
+
+Actions and configuration
+=========================
+
+.. kernel-doc:: include/net/cfg80211.h
+ :doc: Actions and configuration
+
+.. kernel-doc:: include/net/cfg80211.h
+ :functions:
+ cfg80211_ops
+ vif_params
+ key_params
+ survey_info_flags
+ survey_info
+ cfg80211_beacon_data
+ cfg80211_ap_settings
+ station_parameters
+ rate_info_flags
+ rate_info
+ station_info
+ monitor_flags
+ mpath_info_flags
+ mpath_info
+ bss_parameters
+ ieee80211_txq_params
+ cfg80211_crypto_settings
+ cfg80211_auth_request
+ cfg80211_assoc_request
+ cfg80211_deauth_request
+ cfg80211_disassoc_request
+ cfg80211_ibss_params
+ cfg80211_connect_params
+ cfg80211_pmksa
+ cfg80211_rx_mlme_mgmt
+ cfg80211_auth_timeout
+ cfg80211_rx_assoc_resp
+ cfg80211_assoc_timeout
+ cfg80211_tx_mlme_mgmt
+ cfg80211_ibss_joined
+ cfg80211_connect_resp_params
+ cfg80211_connect_done
+ cfg80211_connect_result
+ cfg80211_connect_bss
+ cfg80211_connect_timeout
+ cfg80211_roamed
+ cfg80211_disconnected
+ cfg80211_ready_on_channel
+ cfg80211_remain_on_channel_expired
+ cfg80211_new_sta
+ cfg80211_rx_mgmt
+ cfg80211_mgmt_tx_status
+ cfg80211_cqm_rssi_notify
+ cfg80211_cqm_pktloss_notify
+ cfg80211_michael_mic_failure
+
+Scanning and BSS list handling
+==============================
+
+.. kernel-doc:: include/net/cfg80211.h
+ :doc: Scanning and BSS list handling
+
+.. kernel-doc:: include/net/cfg80211.h
+ :functions:
+ cfg80211_ssid
+ cfg80211_scan_request
+ cfg80211_scan_done
+ cfg80211_bss
+ cfg80211_inform_bss
+ cfg80211_inform_bss_frame_data
+ cfg80211_inform_bss_data
+ cfg80211_unlink_bss
+ cfg80211_find_ie
+ ieee80211_bss_get_ie
+
+Utility functions
+=================
+
+.. kernel-doc:: include/net/cfg80211.h
+ :doc: Utility functions
+
+.. kernel-doc:: include/net/cfg80211.h
+ :functions:
+ ieee80211_channel_to_frequency
+ ieee80211_frequency_to_channel
+ ieee80211_get_channel
+ ieee80211_get_response_rate
+ ieee80211_hdrlen
+ ieee80211_get_hdrlen_from_skb
+ ieee80211_radiotap_iterator
+
+Data path helpers
+=================
+
+.. kernel-doc:: include/net/cfg80211.h
+ :doc: Data path helpers
+
+.. kernel-doc:: include/net/cfg80211.h
+ :functions:
+ ieee80211_data_to_8023
+ ieee80211_amsdu_to_8023s
+ cfg80211_classify8021d
+
+Regulatory enforcement infrastructure
+=====================================
+
+.. kernel-doc:: include/net/cfg80211.h
+ :doc: Regulatory enforcement infrastructure
+
+.. kernel-doc:: include/net/cfg80211.h
+ :functions:
+ regulatory_hint
+ wiphy_apply_custom_regulatory
+ freq_reg_info
+
+RFkill integration
+==================
+
+.. kernel-doc:: include/net/cfg80211.h
+ :doc: RFkill integration
+
+.. kernel-doc:: include/net/cfg80211.h
+ :functions:
+ wiphy_rfkill_set_hw_state
+ wiphy_rfkill_start_polling
+ wiphy_rfkill_stop_polling
+
+Test mode
+=========
+
+.. kernel-doc:: include/net/cfg80211.h
+ :doc: Test mode
+
+.. kernel-doc:: include/net/cfg80211.h
+ :functions:
+ cfg80211_testmode_alloc_reply_skb
+ cfg80211_testmode_reply
+ cfg80211_testmode_alloc_event_skb
+ cfg80211_testmode_event
diff --git a/Documentation/driver-api/80211/index.rst b/Documentation/driver-api/80211/index.rst
new file mode 100644
index 0000000000..af210859d3
--- /dev/null
+++ b/Documentation/driver-api/80211/index.rst
@@ -0,0 +1,17 @@
+=====================================
+Linux 802.11 Driver Developer's Guide
+=====================================
+
+.. toctree::
+
+ introduction
+ cfg80211
+ mac80211
+ mac80211-advanced
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/80211/introduction.rst b/Documentation/driver-api/80211/introduction.rst
new file mode 100644
index 0000000000..4938fa8769
--- /dev/null
+++ b/Documentation/driver-api/80211/introduction.rst
@@ -0,0 +1,17 @@
+============
+Introduction
+============
+
+Explaining wireless 802.11 networking in the Linux kernel
+
+Copyright 2007-2009 Johannes Berg
+
+These books attempt to give a description of the various subsystems
+that play a role in 802.11 wireless networking in Linux. Since these
+books are for kernel developers they attempts to document the
+structures and functions used in the kernel as well as giving a
+higher-level overview.
+
+The reader is expected to be familiar with the 802.11 standard as
+published by the IEEE in 802.11-2007 (or possibly later versions).
+References to this standard will be given as "802.11-2007 8.1.5".
diff --git a/Documentation/driver-api/80211/mac80211-advanced.rst b/Documentation/driver-api/80211/mac80211-advanced.rst
new file mode 100644
index 0000000000..f8df7b3af8
--- /dev/null
+++ b/Documentation/driver-api/80211/mac80211-advanced.rst
@@ -0,0 +1,239 @@
+=============================
+mac80211 subsystem (advanced)
+=============================
+
+Information contained within this part of the book is of interest only
+for advanced interaction of mac80211 with drivers to exploit more
+hardware capabilities and improve performance.
+
+LED support
+===========
+
+Mac80211 supports various ways of blinking LEDs. Wherever possible,
+device LEDs should be exposed as LED class devices and hooked up to the
+appropriate trigger, which will then be triggered appropriately by
+mac80211.
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions:
+ ieee80211_get_tx_led_name
+ ieee80211_get_rx_led_name
+ ieee80211_get_assoc_led_name
+ ieee80211_get_radio_led_name
+ ieee80211_tpt_blink
+ ieee80211_tpt_led_trigger_flags
+ ieee80211_create_tpt_led_trigger
+
+Hardware crypto acceleration
+============================
+
+.. kernel-doc:: include/net/mac80211.h
+ :doc: Hardware crypto acceleration
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions:
+ set_key_cmd
+ ieee80211_key_conf
+ ieee80211_key_flags
+ ieee80211_get_tkip_p1k
+ ieee80211_get_tkip_p1k_iv
+ ieee80211_get_tkip_p2k
+
+Powersave support
+=================
+
+.. kernel-doc:: include/net/mac80211.h
+ :doc: Powersave support
+
+Beacon filter support
+=====================
+
+.. kernel-doc:: include/net/mac80211.h
+ :doc: Beacon filter support
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions: ieee80211_beacon_loss
+
+Multiple queues and QoS support
+===============================
+
+TBD
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions: ieee80211_tx_queue_params
+
+Access point mode support
+=========================
+
+TBD
+
+Some parts of the if_conf should be discussed here instead
+
+Insert notes about VLAN interfaces with hw crypto here or in the hw
+crypto chapter.
+
+support for powersaving clients
+-------------------------------
+
+.. kernel-doc:: include/net/mac80211.h
+ :doc: AP support for powersaving clients
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions:
+ ieee80211_get_buffered_bc
+ ieee80211_beacon_get
+ ieee80211_sta_eosp
+ ieee80211_frame_release_type
+ ieee80211_sta_ps_transition
+ ieee80211_sta_ps_transition_ni
+ ieee80211_sta_set_buffered
+ ieee80211_sta_block_awake
+
+Supporting multiple virtual interfaces
+======================================
+
+TBD
+
+Note: WDS with identical MAC address should almost always be OK
+
+Insert notes about having multiple virtual interfaces with different MAC
+addresses here, note which configurations are supported by mac80211, add
+notes about supporting hw crypto with it.
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions:
+ ieee80211_iterate_active_interfaces
+ ieee80211_iterate_active_interfaces_atomic
+
+Station handling
+================
+
+TODO
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions:
+ ieee80211_sta
+ sta_notify_cmd
+ ieee80211_find_sta
+ ieee80211_find_sta_by_ifaddr
+
+Hardware scan offload
+=====================
+
+TBD
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions: ieee80211_scan_completed
+
+Aggregation
+===========
+
+TX A-MPDU aggregation
+---------------------
+
+.. kernel-doc:: net/mac80211/agg-tx.c
+ :doc: TX A-MPDU aggregation
+
+.. WARNING: DOCPROC directive not supported: !Cnet/mac80211/agg-tx.c
+
+RX A-MPDU aggregation
+---------------------
+
+.. kernel-doc:: net/mac80211/agg-rx.c
+ :doc: RX A-MPDU aggregation
+
+.. WARNING: DOCPROC directive not supported: !Cnet/mac80211/agg-rx.c
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions: ieee80211_ampdu_mlme_action
+
+Spatial Multiplexing Powersave (SMPS)
+=====================================
+
+.. kernel-doc:: include/net/mac80211.h
+ :doc: Spatial multiplexing power save
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions:
+ ieee80211_request_smps
+ ieee80211_smps_mode
+
+TBD
+
+This part of the book describes the rate control algorithm interface and
+how it relates to mac80211 and drivers.
+
+Rate Control API
+================
+
+TBD
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions:
+ ieee80211_start_tx_ba_session
+ ieee80211_start_tx_ba_cb_irqsafe
+ ieee80211_stop_tx_ba_session
+ ieee80211_stop_tx_ba_cb_irqsafe
+ ieee80211_rate_control_changed
+ ieee80211_tx_rate_control
+
+TBD
+
+This part of the book describes mac80211 internals.
+
+Key handling
+============
+
+Key handling basics
+-------------------
+
+.. kernel-doc:: net/mac80211/key.c
+ :doc: Key handling basics
+
+MORE TBD
+--------
+
+TBD
+
+Receive processing
+==================
+
+TBD
+
+Transmit processing
+===================
+
+TBD
+
+Station info handling
+=====================
+
+Programming information
+-----------------------
+
+.. kernel-doc:: net/mac80211/sta_info.h
+ :functions:
+ sta_info
+ ieee80211_sta_info_flags
+
+STA information lifetime rules
+------------------------------
+
+.. kernel-doc:: net/mac80211/sta_info.c
+ :doc: STA information lifetime rules
+
+Aggregation Functions
+=====================
+
+.. kernel-doc:: net/mac80211/sta_info.h
+ :functions:
+ sta_ampdu_mlme
+ tid_ampdu_tx
+ tid_ampdu_rx
+
+Synchronisation Functions
+=========================
+
+TBD
+
+Locking, lots of RCU
diff --git a/Documentation/driver-api/80211/mac80211.rst b/Documentation/driver-api/80211/mac80211.rst
new file mode 100644
index 0000000000..67d2e58b45
--- /dev/null
+++ b/Documentation/driver-api/80211/mac80211.rst
@@ -0,0 +1,155 @@
+===========================
+mac80211 subsystem (basics)
+===========================
+
+You should read and understand the information contained within this
+part of the book while implementing a mac80211 driver. In some chapters,
+advanced usage is noted, those may be skipped if this isn't needed.
+
+This part of the book only covers station and monitor mode
+functionality, additional information required to implement the other
+modes is covered in the second part of the book.
+
+Basic hardware handling
+=======================
+
+TBD
+
+This chapter shall contain information on getting a hw struct allocated
+and registered with mac80211.
+
+Since it is required to allocate rates/modes before registering a hw
+struct, this chapter shall also contain information on setting up the
+rate/mode structs.
+
+Additionally, some discussion about the callbacks and the general
+programming model should be in here, including the definition of
+ieee80211_ops which will be referred to a lot.
+
+Finally, a discussion of hardware capabilities should be done with
+references to other parts of the book.
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions:
+ ieee80211_hw
+ ieee80211_hw_flags
+ SET_IEEE80211_DEV
+ SET_IEEE80211_PERM_ADDR
+ ieee80211_ops
+ ieee80211_alloc_hw
+ ieee80211_register_hw
+ ieee80211_unregister_hw
+ ieee80211_free_hw
+
+PHY configuration
+=================
+
+TBD
+
+This chapter should describe PHY handling including start/stop callbacks
+and the various structures used.
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions:
+ ieee80211_conf
+ ieee80211_conf_flags
+
+Virtual interfaces
+==================
+
+TBD
+
+This chapter should describe virtual interface basics that are relevant
+to the driver (VLANs, MGMT etc are not.) It should explain the use of
+the add_iface/remove_iface callbacks as well as the interface
+configuration callbacks.
+
+Things related to AP mode should be discussed there.
+
+Things related to supporting multiple interfaces should be in the
+appropriate chapter, a BIG FAT note should be here about this though and
+the recommendation to allow only a single interface in STA mode at
+first!
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions: ieee80211_vif
+
+Receive and transmit processing
+===============================
+
+what should be here
+-------------------
+
+TBD
+
+This should describe the receive and transmit paths in mac80211/the
+drivers as well as transmit status handling.
+
+Frame format
+------------
+
+.. kernel-doc:: include/net/mac80211.h
+ :doc: Frame format
+
+Packet alignment
+----------------
+
+.. kernel-doc:: net/mac80211/rx.c
+ :doc: Packet alignment
+
+Calling into mac80211 from interrupts
+-------------------------------------
+
+.. kernel-doc:: include/net/mac80211.h
+ :doc: Calling mac80211 from interrupts
+
+functions/definitions
+---------------------
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions:
+ ieee80211_rx_status
+ mac80211_rx_encoding_flags
+ mac80211_rx_flags
+ mac80211_tx_info_flags
+ mac80211_tx_control_flags
+ mac80211_rate_control_flags
+ ieee80211_tx_rate
+ ieee80211_tx_info
+ ieee80211_tx_info_clear_status
+ ieee80211_rx
+ ieee80211_rx_ni
+ ieee80211_rx_irqsafe
+ ieee80211_tx_status
+ ieee80211_tx_status_ni
+ ieee80211_tx_status_irqsafe
+ ieee80211_rts_get
+ ieee80211_rts_duration
+ ieee80211_ctstoself_get
+ ieee80211_ctstoself_duration
+ ieee80211_generic_frame_duration
+ ieee80211_wake_queue
+ ieee80211_stop_queue
+ ieee80211_wake_queues
+ ieee80211_stop_queues
+ ieee80211_queue_stopped
+
+Frame filtering
+===============
+
+.. kernel-doc:: include/net/mac80211.h
+ :doc: Frame filtering
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions: ieee80211_filter_flags
+
+The mac80211 workqueue
+======================
+
+.. kernel-doc:: include/net/mac80211.h
+ :doc: mac80211 workqueue
+
+.. kernel-doc:: include/net/mac80211.h
+ :functions:
+ ieee80211_queue_work
+ ieee80211_queue_delayed_work
diff --git a/Documentation/driver-api/acpi/index.rst b/Documentation/driver-api/acpi/index.rst
new file mode 100644
index 0000000000..ace0008e54
--- /dev/null
+++ b/Documentation/driver-api/acpi/index.rst
@@ -0,0 +1,9 @@
+============
+ACPI Support
+============
+
+.. toctree::
+ :maxdepth: 2
+
+ linuxized-acpica
+ scan_handlers
diff --git a/Documentation/driver-api/acpi/linuxized-acpica.rst b/Documentation/driver-api/acpi/linuxized-acpica.rst
new file mode 100644
index 0000000000..cc234353d2
--- /dev/null
+++ b/Documentation/driver-api/acpi/linuxized-acpica.rst
@@ -0,0 +1,279 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. include:: <isonum.txt>
+
+============================================================
+Linuxized ACPICA - Introduction to ACPICA Release Automation
+============================================================
+
+:Copyright: |copy| 2013-2016, Intel Corporation
+
+:Author: Lv Zheng <lv.zheng@intel.com>
+
+
+Abstract
+========
+This document describes the ACPICA project and the relationship between
+ACPICA and Linux. It also describes how ACPICA code in drivers/acpi/acpica,
+include/acpi and tools/power/acpi is automatically updated to follow the
+upstream.
+
+ACPICA Project
+==============
+
+The ACPI Component Architecture (ACPICA) project provides an operating
+system (OS)-independent reference implementation of the Advanced
+Configuration and Power Interface Specification (ACPI). It has been
+adapted by various host OSes. By directly integrating ACPICA, Linux can
+also benefit from the application experiences of ACPICA from other host
+OSes.
+
+The homepage of ACPICA project is: www.acpica.org, it is maintained and
+supported by Intel Corporation.
+
+The following figure depicts the Linux ACPI subsystem where the ACPICA
+adaptation is included::
+
+ +---------------------------------------------------------+
+ | |
+ | +---------------------------------------------------+ |
+ | | +------------------+ | |
+ | | | Table Management | | |
+ | | +------------------+ | |
+ | | +----------------------+ | |
+ | | | Namespace Management | | |
+ | | +----------------------+ | |
+ | | +------------------+ ACPICA Components | |
+ | | | Event Management | | |
+ | | +------------------+ | |
+ | | +---------------------+ | |
+ | | | Resource Management | | |
+ | | +---------------------+ | |
+ | | +---------------------+ | |
+ | | | Hardware Management | | |
+ | | +---------------------+ | |
+ | +---------------------------------------------------+ | |
+ | | | +------------------+ | | |
+ | | | | OS Service Layer | | | |
+ | | | +------------------+ | | |
+ | | +-------------------------------------------------|-+ |
+ | | +--------------------+ | |
+ | | | Device Enumeration | | |
+ | | +--------------------+ | |
+ | | +------------------+ | |
+ | | | Power Management | | |
+ | | +------------------+ Linux/ACPI Components | |
+ | | +--------------------+ | |
+ | | | Thermal Management | | |
+ | | +--------------------+ | |
+ | | +--------------------------+ | |
+ | | | Drivers for ACPI Devices | | |
+ | | +--------------------------+ | |
+ | | +--------+ | |
+ | | | ...... | | |
+ | | +--------+ | |
+ | +---------------------------------------------------+ |
+ | |
+ +---------------------------------------------------------+
+
+ Figure 1. Linux ACPI Software Components
+
+.. note::
+ A. OS Service Layer - Provided by Linux to offer OS dependent
+ implementation of the predefined ACPICA interfaces (acpi_os_*).
+ ::
+
+ include/acpi/acpiosxf.h
+ drivers/acpi/osl.c
+ include/acpi/platform
+ include/asm/acenv.h
+ B. ACPICA Functionality - Released from ACPICA code base to offer
+ OS independent implementation of the ACPICA interfaces (acpi_*).
+ ::
+
+ drivers/acpi/acpica
+ include/acpi/ac*.h
+ tools/power/acpi
+ C. Linux/ACPI Functionality - Providing Linux specific ACPI
+ functionality to the other Linux kernel subsystems and user space
+ programs.
+ ::
+
+ drivers/acpi
+ include/linux/acpi.h
+ include/linux/acpi*.h
+ include/acpi
+ tools/power/acpi
+ D. Architecture Specific ACPICA/ACPI Functionalities - Provided by the
+ ACPI subsystem to offer architecture specific implementation of the
+ ACPI interfaces. They are Linux specific components and are out of
+ the scope of this document.
+ ::
+
+ include/asm/acpi.h
+ include/asm/acpi*.h
+ arch/*/acpi
+
+ACPICA Release
+==============
+
+The ACPICA project maintains its code base at the following repository URL:
+https://github.com/acpica/acpica.git. As a rule, a release is made every
+month.
+
+As the coding style adopted by the ACPICA project is not acceptable by
+Linux, there is a release process to convert the ACPICA git commits into
+Linux patches. The patches generated by this process are referred to as
+"linuxized ACPICA patches". The release process is carried out on a local
+copy the ACPICA git repository. Each commit in the monthly release is
+converted into a linuxized ACPICA patch. Together, they form the monthly
+ACPICA release patchset for the Linux ACPI community. This process is
+illustrated in the following figure::
+
+ +-----------------------------+
+ | acpica / master (-) commits |
+ +-----------------------------+
+ /|\ |
+ | \|/
+ | /---------------------\ +----------------------+
+ | < Linuxize repo Utility >-->| old linuxized acpica |--+
+ | \---------------------/ +----------------------+ |
+ | |
+ /---------\ |
+ < git reset > \
+ \---------/ \
+ /|\ /+-+
+ | / |
+ +-----------------------------+ | |
+ | acpica / master (+) commits | | |
+ +-----------------------------+ | |
+ | | |
+ \|/ | |
+ /-----------------------\ +----------------------+ | |
+ < Linuxize repo Utilities >-->| new linuxized acpica |--+ |
+ \-----------------------/ +----------------------+ |
+ \|/
+ +--------------------------+ /----------------------\
+ | Linuxized ACPICA Patches |<----------------< Linuxize patch Utility >
+ +--------------------------+ \----------------------/
+ |
+ \|/
+ /---------------------------\
+ < Linux ACPI Community Review >
+ \---------------------------/
+ |
+ \|/
+ +-----------------------+ /------------------\ +----------------+
+ | linux-pm / linux-next |-->< Linux Merge Window >-->| linux / master |
+ +-----------------------+ \------------------/ +----------------+
+
+ Figure 2. ACPICA -> Linux Upstream Process
+
+.. note::
+ A. Linuxize Utilities - Provided by the ACPICA repository, including a
+ utility located in source/tools/acpisrc folder and a number of
+ scripts located in generate/linux folder.
+ B. acpica / master - "master" branch of the git repository at
+ <https://github.com/acpica/acpica.git>.
+ C. linux-pm / linux-next - "linux-next" branch of the git repository at
+ <https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git>.
+ D. linux / master - "master" branch of the git repository at
+ <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git>.
+
+ Before the linuxized ACPICA patches are sent to the Linux ACPI community
+ for review, there is a quality assurance build test process to reduce
+ porting issues. Currently this build process only takes care of the
+ following kernel configuration options:
+ CONFIG_ACPI/CONFIG_ACPI_DEBUG/CONFIG_ACPI_DEBUGGER
+
+ACPICA Divergences
+==================
+
+Ideally, all of the ACPICA commits should be converted into Linux patches
+automatically without manual modifications, the "linux / master" tree should
+contain the ACPICA code that exactly corresponds to the ACPICA code
+contained in "new linuxized acpica" tree and it should be possible to run
+the release process fully automatically.
+
+As a matter of fact, however, there are source code differences between
+the ACPICA code in Linux and the upstream ACPICA code, referred to as
+"ACPICA Divergences".
+
+The various sources of ACPICA divergences include:
+ 1. Legacy divergences - Before the current ACPICA release process was
+ established, there already had been divergences between Linux and
+ ACPICA. Over the past several years those divergences have been greatly
+ reduced, but there still are several ones and it takes time to figure
+ out the underlying reasons for their existence.
+ 2. Manual modifications - Any manual modification (eg. coding style fixes)
+ made directly in the Linux sources obviously hurts the ACPICA release
+ automation. Thus it is recommended to fix such issues in the ACPICA
+ upstream source code and generate the linuxized fix using the ACPICA
+ release utilities (please refer to Section 4 below for the details).
+ 3. Linux specific features - Sometimes it's impossible to use the
+ current ACPICA APIs to implement features required by the Linux kernel,
+ so Linux developers occasionally have to change ACPICA code directly.
+ Those changes may not be acceptable by ACPICA upstream and in such cases
+ they are left as committed ACPICA divergences unless the ACPICA side can
+ implement new mechanisms as replacements for them.
+ 4. ACPICA release fixups - ACPICA only tests commits using a set of the
+ user space simulation utilities, thus the linuxized ACPICA patches may
+ break the Linux kernel, leaving us build/boot failures. In order to
+ avoid breaking Linux bisection, fixes are applied directly to the
+ linuxized ACPICA patches during the release process. When the release
+ fixups are backported to the upstream ACPICA sources, they must follow
+ the upstream ACPICA rules and so further modifications may appear.
+ That may result in the appearance of new divergences.
+ 5. Fast tracking of ACPICA commits - Some ACPICA commits are regression
+ fixes or stable-candidate material, so they are applied in advance with
+ respect to the ACPICA release process. If such commits are reverted or
+ rebased on the ACPICA side in order to offer better solutions, new ACPICA
+ divergences are generated.
+
+ACPICA Development
+==================
+
+This paragraph guides Linux developers to use the ACPICA upstream release
+utilities to obtain Linux patches corresponding to upstream ACPICA commits
+before they become available from the ACPICA release process.
+
+ 1. Cherry-pick an ACPICA commit
+
+ First you need to git clone the ACPICA repository and the ACPICA change
+ you want to cherry pick must be committed into the local repository.
+
+ Then the gen-patch.sh command can help to cherry-pick an ACPICA commit
+ from the ACPICA local repository::
+
+ $ git clone https://github.com/acpica/acpica
+ $ cd acpica
+ $ generate/linux/gen-patch.sh -u [commit ID]
+
+ Here the commit ID is the ACPICA local repository commit ID you want to
+ cherry pick. It can be omitted if the commit is "HEAD".
+
+ 2. Cherry-pick recent ACPICA commits
+
+ Sometimes you need to rebase your code on top of the most recent ACPICA
+ changes that haven't been applied to Linux yet.
+
+ You can generate the ACPICA release series yourself and rebase your code on
+ top of the generated ACPICA release patches::
+
+ $ git clone https://github.com/acpica/acpica
+ $ cd acpica
+ $ generate/linux/make-patches.sh -u [commit ID]
+
+ The commit ID should be the last ACPICA commit accepted by Linux. Usually,
+ it is the commit modifying ACPI_CA_VERSION. It can be found by executing
+ "git blame source/include/acpixf.h" and referencing the line that contains
+ "ACPI_CA_VERSION".
+
+ 3. Inspect the current divergences
+
+ If you have local copies of both Linux and upstream ACPICA, you can generate
+ a diff file indicating the state of the current divergences::
+
+ # git clone https://github.com/acpica/acpica
+ # git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
+ # cd acpica
+ # generate/linux/divergence.sh -s ../linux
diff --git a/Documentation/driver-api/acpi/scan_handlers.rst b/Documentation/driver-api/acpi/scan_handlers.rst
new file mode 100644
index 0000000000..7a197b3a33
--- /dev/null
+++ b/Documentation/driver-api/acpi/scan_handlers.rst
@@ -0,0 +1,83 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. include:: <isonum.txt>
+
+==================
+ACPI Scan Handlers
+==================
+
+:Copyright: |copy| 2012, Intel Corporation
+
+:Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+
+During system initialization and ACPI-based device hot-add, the ACPI namespace
+is scanned in search of device objects that generally represent various pieces
+of hardware. This causes a struct acpi_device object to be created and
+registered with the driver core for every device object in the ACPI namespace
+and the hierarchy of those struct acpi_device objects reflects the namespace
+layout (i.e. parent device objects in the namespace are represented by parent
+struct acpi_device objects and analogously for their children). Those struct
+acpi_device objects are referred to as "device nodes" in what follows, but they
+should not be confused with struct device_node objects used by the Device Trees
+parsing code (although their role is analogous to the role of those objects).
+
+During ACPI-based device hot-remove device nodes representing pieces of hardware
+being removed are unregistered and deleted.
+
+The core ACPI namespace scanning code in drivers/acpi/scan.c carries out basic
+initialization of device nodes, such as retrieving common configuration
+information from the device objects represented by them and populating them with
+appropriate data, but some of them require additional handling after they have
+been registered. For example, if the given device node represents a PCI host
+bridge, its registration should cause the PCI bus under that bridge to be
+enumerated and PCI devices on that bus to be registered with the driver core.
+Similarly, if the device node represents a PCI interrupt link, it is necessary
+to configure that link so that the kernel can use it.
+
+Those additional configuration tasks usually depend on the type of the hardware
+component represented by the given device node which can be determined on the
+basis of the device node's hardware ID (HID). They are performed by objects
+called ACPI scan handlers represented by the following structure::
+
+ struct acpi_scan_handler {
+ const struct acpi_device_id *ids;
+ struct list_head list_node;
+ int (*attach)(struct acpi_device *dev, const struct acpi_device_id *id);
+ void (*detach)(struct acpi_device *dev);
+ };
+
+where ids is the list of IDs of device nodes the given handler is supposed to
+take care of, list_node is the hook to the global list of ACPI scan handlers
+maintained by the ACPI core and the .attach() and .detach() callbacks are
+executed, respectively, after registration of new device nodes and before
+unregistration of device nodes the handler attached to previously.
+
+The namespace scanning function, acpi_bus_scan(), first registers all of the
+device nodes in the given namespace scope with the driver core. Then, it tries
+to match a scan handler against each of them using the ids arrays of the
+available scan handlers. If a matching scan handler is found, its .attach()
+callback is executed for the given device node. If that callback returns 1,
+that means that the handler has claimed the device node and is now responsible
+for carrying out any additional configuration tasks related to it. It also will
+be responsible for preparing the device node for unregistration in that case.
+The device node's handler field is then populated with the address of the scan
+handler that has claimed it.
+
+If the .attach() callback returns 0, it means that the device node is not
+interesting to the given scan handler and may be matched against the next scan
+handler in the list. If it returns a (negative) error code, that means that
+the namespace scan should be terminated due to a serious error. The error code
+returned should then reflect the type of the error.
+
+The namespace trimming function, acpi_bus_trim(), first executes .detach()
+callbacks from the scan handlers of all device nodes in the given namespace
+scope (if they have scan handlers). Next, it unregisters all of the device
+nodes in that scope.
+
+ACPI scan handlers can be added to the list maintained by the ACPI core with the
+help of the acpi_scan_add_handler() function taking a pointer to the new scan
+handler as an argument. The order in which scan handlers are added to the list
+is the order in which they are matched against device nodes during namespace
+scans.
+
+All scan handles must be added to the list before acpi_bus_scan() is run for the
+first time and they cannot be removed from it.
diff --git a/Documentation/driver-api/aperture.rst b/Documentation/driver-api/aperture.rst
new file mode 100644
index 0000000000..d173f4e7a7
--- /dev/null
+++ b/Documentation/driver-api/aperture.rst
@@ -0,0 +1,13 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Managing Ownership of the Framebuffer Aperture
+==============================================
+
+.. kernel-doc:: drivers/video/aperture.c
+ :doc: overview
+
+.. kernel-doc:: include/linux/aperture.h
+ :internal:
+
+.. kernel-doc:: drivers/video/aperture.c
+ :export:
diff --git a/Documentation/driver-api/auxiliary_bus.rst b/Documentation/driver-api/auxiliary_bus.rst
new file mode 100644
index 0000000000..cec84908fb
--- /dev/null
+++ b/Documentation/driver-api/auxiliary_bus.rst
@@ -0,0 +1,50 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+.. _auxiliary_bus:
+
+=============
+Auxiliary Bus
+=============
+
+.. kernel-doc:: drivers/base/auxiliary.c
+ :doc: PURPOSE
+
+When Should the Auxiliary Bus Be Used
+=====================================
+
+.. kernel-doc:: drivers/base/auxiliary.c
+ :doc: USAGE
+
+
+Auxiliary Device Creation
+=========================
+
+.. kernel-doc:: include/linux/auxiliary_bus.h
+ :identifiers: auxiliary_device
+
+.. kernel-doc:: drivers/base/auxiliary.c
+ :identifiers: auxiliary_device_init __auxiliary_device_add
+ auxiliary_find_device
+
+Auxiliary Device Memory Model and Lifespan
+------------------------------------------
+
+.. kernel-doc:: include/linux/auxiliary_bus.h
+ :doc: DEVICE_LIFESPAN
+
+
+Auxiliary Drivers
+=================
+
+.. kernel-doc:: include/linux/auxiliary_bus.h
+ :identifiers: auxiliary_driver module_auxiliary_driver
+
+.. kernel-doc:: drivers/base/auxiliary.c
+ :identifiers: __auxiliary_driver_register auxiliary_driver_unregister
+
+Example Usage
+=============
+
+.. kernel-doc:: drivers/base/auxiliary.c
+ :doc: EXAMPLE
+
diff --git a/Documentation/driver-api/backlight/lp855x-driver.rst b/Documentation/driver-api/backlight/lp855x-driver.rst
new file mode 100644
index 0000000000..1e0b224fc3
--- /dev/null
+++ b/Documentation/driver-api/backlight/lp855x-driver.rst
@@ -0,0 +1,81 @@
+====================
+Kernel driver lp855x
+====================
+
+Backlight driver for LP855x ICs
+
+Supported chips:
+
+ Texas Instruments LP8550, LP8551, LP8552, LP8553, LP8555, LP8556 and
+ LP8557
+
+Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+
+Description
+-----------
+
+* Brightness control
+
+ Brightness can be controlled by the pwm input or the i2c command.
+ The lp855x driver supports both cases.
+
+* Device attributes
+
+ 1) bl_ctl_mode
+
+ Backlight control mode.
+
+ Value: pwm based or register based
+
+ 2) chip_id
+
+ The lp855x chip id.
+
+ Value: lp8550/lp8551/lp8552/lp8553/lp8555/lp8556/lp8557
+
+Platform data for lp855x
+------------------------
+
+For supporting platform specific data, the lp855x platform data can be used.
+
+* name:
+ Backlight driver name. If it is not defined, default name is set.
+* device_control:
+ Value of DEVICE CONTROL register.
+* initial_brightness:
+ Initial value of backlight brightness.
+* period_ns:
+ Platform specific PWM period value. unit is nano.
+ Only valid when brightness is pwm input mode.
+* size_program:
+ Total size of lp855x_rom_data.
+* rom_data:
+ List of new eeprom/eprom registers.
+
+Examples
+========
+
+1) lp8552 platform data: i2c register mode with new eeprom data::
+
+ #define EEPROM_A5_ADDR 0xA5
+ #define EEPROM_A5_VAL 0x4f /* EN_VSYNC=0 */
+
+ static struct lp855x_rom_data lp8552_eeprom_arr[] = {
+ {EEPROM_A5_ADDR, EEPROM_A5_VAL},
+ };
+
+ static struct lp855x_platform_data lp8552_pdata = {
+ .name = "lcd-bl",
+ .device_control = I2C_CONFIG(LP8552),
+ .initial_brightness = INITIAL_BRT,
+ .size_program = ARRAY_SIZE(lp8552_eeprom_arr),
+ .rom_data = lp8552_eeprom_arr,
+ };
+
+2) lp8556 platform data: pwm input mode with default rom data::
+
+ static struct lp855x_platform_data lp8556_pdata = {
+ .device_control = PWM_CONFIG(LP8556),
+ .initial_brightness = INITIAL_BRT,
+ .period_ns = 1000000,
+ };
diff --git a/Documentation/driver-api/basics.rst b/Documentation/driver-api/basics.rst
new file mode 100644
index 0000000000..d78b7c328f
--- /dev/null
+++ b/Documentation/driver-api/basics.rst
@@ -0,0 +1,130 @@
+Driver Basics
+=============
+
+Driver Entry and Exit points
+----------------------------
+
+.. kernel-doc:: include/linux/module.h
+ :internal:
+
+Driver device table
+-------------------
+
+.. kernel-doc:: include/linux/mod_devicetable.h
+ :internal:
+ :no-identifiers: pci_device_id
+
+
+Delaying and scheduling routines
+--------------------------------
+
+.. kernel-doc:: include/linux/sched.h
+ :internal:
+
+.. kernel-doc:: kernel/sched/core.c
+ :export:
+
+.. kernel-doc:: kernel/sched/cpupri.c
+ :internal:
+
+.. kernel-doc:: kernel/sched/fair.c
+ :internal:
+
+.. kernel-doc:: include/linux/completion.h
+ :internal:
+
+Time and timer routines
+-----------------------
+
+.. kernel-doc:: include/linux/jiffies.h
+ :internal:
+
+.. kernel-doc:: kernel/time/time.c
+ :export:
+
+.. kernel-doc:: kernel/time/timer.c
+ :export:
+
+High-resolution timers
+----------------------
+
+.. kernel-doc:: include/linux/ktime.h
+ :internal:
+
+.. kernel-doc:: include/linux/hrtimer.h
+ :internal:
+
+.. kernel-doc:: kernel/time/hrtimer.c
+ :export:
+
+Wait queues and Wake events
+---------------------------
+
+.. kernel-doc:: include/linux/wait.h
+ :internal:
+
+.. kernel-doc:: kernel/sched/wait.c
+ :export:
+
+Internal Functions
+------------------
+
+.. kernel-doc:: kernel/exit.c
+ :internal:
+
+.. kernel-doc:: kernel/signal.c
+ :internal:
+
+.. kernel-doc:: include/linux/kthread.h
+ :internal:
+
+.. kernel-doc:: kernel/kthread.c
+ :export:
+
+Reference counting
+------------------
+
+.. kernel-doc:: include/linux/refcount.h
+ :internal:
+
+.. kernel-doc:: lib/refcount.c
+ :export:
+
+Atomics
+-------
+
+.. kernel-doc:: include/linux/atomic/atomic-instrumented.h
+ :internal:
+
+.. kernel-doc:: include/linux/atomic/atomic-arch-fallback.h
+ :internal:
+
+.. kernel-doc:: include/linux/atomic/atomic-long.h
+ :internal:
+
+Kernel objects manipulation
+---------------------------
+
+.. kernel-doc:: lib/kobject.c
+ :export:
+
+Kernel utility functions
+------------------------
+
+.. kernel-doc:: include/linux/kernel.h
+ :internal:
+ :no-identifiers: kstrtol kstrtoul
+
+.. kernel-doc:: kernel/printk/printk.c
+ :export:
+ :no-identifiers: printk
+
+.. kernel-doc:: kernel/panic.c
+ :export:
+
+Device Resource Management
+--------------------------
+
+.. kernel-doc:: drivers/base/devres.c
+ :export:
+
diff --git a/Documentation/driver-api/clk.rst b/Documentation/driver-api/clk.rst
new file mode 100644
index 0000000000..93bab5336d
--- /dev/null
+++ b/Documentation/driver-api/clk.rst
@@ -0,0 +1,312 @@
+========================
+The Common Clk Framework
+========================
+
+:Author: Mike Turquette <mturquette@ti.com>
+
+This document endeavours to explain the common clk framework details,
+and how to port a platform over to this framework. It is not yet a
+detailed explanation of the clock api in include/linux/clk.h, but
+perhaps someday it will include that information.
+
+Introduction and interface split
+================================
+
+The common clk framework is an interface to control the clock nodes
+available on various devices today. This may come in the form of clock
+gating, rate adjustment, muxing or other operations. This framework is
+enabled with the CONFIG_COMMON_CLK option.
+
+The interface itself is divided into two halves, each shielded from the
+details of its counterpart. First is the common definition of struct
+clk which unifies the framework-level accounting and infrastructure that
+has traditionally been duplicated across a variety of platforms. Second
+is a common implementation of the clk.h api, defined in
+drivers/clk/clk.c. Finally there is struct clk_ops, whose operations
+are invoked by the clk api implementation.
+
+The second half of the interface is comprised of the hardware-specific
+callbacks registered with struct clk_ops and the corresponding
+hardware-specific structures needed to model a particular clock. For
+the remainder of this document any reference to a callback in struct
+clk_ops, such as .enable or .set_rate, implies the hardware-specific
+implementation of that code. Likewise, references to struct clk_foo
+serve as a convenient shorthand for the implementation of the
+hardware-specific bits for the hypothetical "foo" hardware.
+
+Tying the two halves of this interface together is struct clk_hw, which
+is defined in struct clk_foo and pointed to within struct clk_core. This
+allows for easy navigation between the two discrete halves of the common
+clock interface.
+
+Common data structures and api
+==============================
+
+Below is the common struct clk_core definition from
+drivers/clk/clk.c, modified for brevity::
+
+ struct clk_core {
+ const char *name;
+ const struct clk_ops *ops;
+ struct clk_hw *hw;
+ struct module *owner;
+ struct clk_core *parent;
+ const char **parent_names;
+ struct clk_core **parents;
+ u8 num_parents;
+ u8 new_parent_index;
+ ...
+ };
+
+The members above make up the core of the clk tree topology. The clk
+api itself defines several driver-facing functions which operate on
+struct clk. That api is documented in include/linux/clk.h.
+
+Platforms and devices utilizing the common struct clk_core use the struct
+clk_ops pointer in struct clk_core to perform the hardware-specific parts of
+the operations defined in clk-provider.h::
+
+ struct clk_ops {
+ int (*prepare)(struct clk_hw *hw);
+ void (*unprepare)(struct clk_hw *hw);
+ int (*is_prepared)(struct clk_hw *hw);
+ void (*unprepare_unused)(struct clk_hw *hw);
+ int (*enable)(struct clk_hw *hw);
+ void (*disable)(struct clk_hw *hw);
+ int (*is_enabled)(struct clk_hw *hw);
+ void (*disable_unused)(struct clk_hw *hw);
+ unsigned long (*recalc_rate)(struct clk_hw *hw,
+ unsigned long parent_rate);
+ long (*round_rate)(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long *parent_rate);
+ int (*determine_rate)(struct clk_hw *hw,
+ struct clk_rate_request *req);
+ int (*set_parent)(struct clk_hw *hw, u8 index);
+ u8 (*get_parent)(struct clk_hw *hw);
+ int (*set_rate)(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long parent_rate);
+ int (*set_rate_and_parent)(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long parent_rate,
+ u8 index);
+ unsigned long (*recalc_accuracy)(struct clk_hw *hw,
+ unsigned long parent_accuracy);
+ int (*get_phase)(struct clk_hw *hw);
+ int (*set_phase)(struct clk_hw *hw, int degrees);
+ void (*init)(struct clk_hw *hw);
+ void (*debug_init)(struct clk_hw *hw,
+ struct dentry *dentry);
+ };
+
+Hardware clk implementations
+============================
+
+The strength of the common struct clk_core comes from its .ops and .hw pointers
+which abstract the details of struct clk from the hardware-specific bits, and
+vice versa. To illustrate consider the simple gateable clk implementation in
+drivers/clk/clk-gate.c::
+
+ struct clk_gate {
+ struct clk_hw hw;
+ void __iomem *reg;
+ u8 bit_idx;
+ ...
+ };
+
+struct clk_gate contains struct clk_hw hw as well as hardware-specific
+knowledge about which register and bit controls this clk's gating.
+Nothing about clock topology or accounting, such as enable_count or
+notifier_count, is needed here. That is all handled by the common
+framework code and struct clk_core.
+
+Let's walk through enabling this clk from driver code::
+
+ struct clk *clk;
+ clk = clk_get(NULL, "my_gateable_clk");
+
+ clk_prepare(clk);
+ clk_enable(clk);
+
+The call graph for clk_enable is very simple::
+
+ clk_enable(clk);
+ clk->ops->enable(clk->hw);
+ [resolves to...]
+ clk_gate_enable(hw);
+ [resolves struct clk gate with to_clk_gate(hw)]
+ clk_gate_set_bit(gate);
+
+And the definition of clk_gate_set_bit::
+
+ static void clk_gate_set_bit(struct clk_gate *gate)
+ {
+ u32 reg;
+
+ reg = __raw_readl(gate->reg);
+ reg |= BIT(gate->bit_idx);
+ writel(reg, gate->reg);
+ }
+
+Note that to_clk_gate is defined as::
+
+ #define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw)
+
+This pattern of abstraction is used for every clock hardware
+representation.
+
+Supporting your own clk hardware
+================================
+
+When implementing support for a new type of clock it is only necessary to
+include the following header::
+
+ #include <linux/clk-provider.h>
+
+To construct a clk hardware structure for your platform you must define
+the following::
+
+ struct clk_foo {
+ struct clk_hw hw;
+ ... hardware specific data goes here ...
+ };
+
+To take advantage of your data you'll need to support valid operations
+for your clk::
+
+ struct clk_ops clk_foo_ops = {
+ .enable = &clk_foo_enable,
+ .disable = &clk_foo_disable,
+ };
+
+Implement the above functions using container_of::
+
+ #define to_clk_foo(_hw) container_of(_hw, struct clk_foo, hw)
+
+ int clk_foo_enable(struct clk_hw *hw)
+ {
+ struct clk_foo *foo;
+
+ foo = to_clk_foo(hw);
+
+ ... perform magic on foo ...
+
+ return 0;
+ };
+
+Below is a matrix detailing which clk_ops are mandatory based upon the
+hardware capabilities of that clock. A cell marked as "y" means
+mandatory, a cell marked as "n" implies that either including that
+callback is invalid or otherwise unnecessary. Empty cells are either
+optional or must be evaluated on a case-by-case basis.
+
+.. table:: clock hardware characteristics
+
+ +----------------+------+-------------+---------------+-------------+------+
+ | | gate | change rate | single parent | multiplexer | root |
+ +================+======+=============+===============+=============+======+
+ |.prepare | | | | | |
+ +----------------+------+-------------+---------------+-------------+------+
+ |.unprepare | | | | | |
+ +----------------+------+-------------+---------------+-------------+------+
+ +----------------+------+-------------+---------------+-------------+------+
+ |.enable | y | | | | |
+ +----------------+------+-------------+---------------+-------------+------+
+ |.disable | y | | | | |
+ +----------------+------+-------------+---------------+-------------+------+
+ |.is_enabled | y | | | | |
+ +----------------+------+-------------+---------------+-------------+------+
+ +----------------+------+-------------+---------------+-------------+------+
+ |.recalc_rate | | y | | | |
+ +----------------+------+-------------+---------------+-------------+------+
+ |.round_rate | | y [1]_ | | | |
+ +----------------+------+-------------+---------------+-------------+------+
+ |.determine_rate | | y [1]_ | | | |
+ +----------------+------+-------------+---------------+-------------+------+
+ |.set_rate | | y | | | |
+ +----------------+------+-------------+---------------+-------------+------+
+ +----------------+------+-------------+---------------+-------------+------+
+ |.set_parent | | | n | y | n |
+ +----------------+------+-------------+---------------+-------------+------+
+ |.get_parent | | | n | y | n |
+ +----------------+------+-------------+---------------+-------------+------+
+ +----------------+------+-------------+---------------+-------------+------+
+ |.recalc_accuracy| | | | | |
+ +----------------+------+-------------+---------------+-------------+------+
+ +----------------+------+-------------+---------------+-------------+------+
+ |.init | | | | | |
+ +----------------+------+-------------+---------------+-------------+------+
+
+.. [1] either one of round_rate or determine_rate is required.
+
+Finally, register your clock at run-time with a hardware-specific
+registration function. This function simply populates struct clk_foo's
+data and then passes the common struct clk parameters to the framework
+with a call to::
+
+ clk_register(...)
+
+See the basic clock types in ``drivers/clk/clk-*.c`` for examples.
+
+Disabling clock gating of unused clocks
+=======================================
+
+Sometimes during development it can be useful to be able to bypass the
+default disabling of unused clocks. For example, if drivers aren't enabling
+clocks properly but rely on them being on from the bootloader, bypassing
+the disabling means that the driver will remain functional while the issues
+are sorted out.
+
+You can see which clocks have been disabled by booting your kernel with these
+parameters::
+
+ tp_printk trace_event=clk:clk_disable
+
+To bypass this disabling, include "clk_ignore_unused" in the bootargs to the
+kernel.
+
+Locking
+=======
+
+The common clock framework uses two global locks, the prepare lock and the
+enable lock.
+
+The enable lock is a spinlock and is held across calls to the .enable,
+.disable operations. Those operations are thus not allowed to sleep,
+and calls to the clk_enable(), clk_disable() API functions are allowed in
+atomic context.
+
+For clk_is_enabled() API, it is also designed to be allowed to be used in
+atomic context. However, it doesn't really make any sense to hold the enable
+lock in core, unless you want to do something else with the information of
+the enable state with that lock held. Otherwise, seeing if a clk is enabled is
+a one-shot read of the enabled state, which could just as easily change after
+the function returns because the lock is released. Thus the user of this API
+needs to handle synchronizing the read of the state with whatever they're
+using it for to make sure that the enable state doesn't change during that
+time.
+
+The prepare lock is a mutex and is held across calls to all other operations.
+All those operations are allowed to sleep, and calls to the corresponding API
+functions are not allowed in atomic context.
+
+This effectively divides operations in two groups from a locking perspective.
+
+Drivers don't need to manually protect resources shared between the operations
+of one group, regardless of whether those resources are shared by multiple
+clocks or not. However, access to resources that are shared between operations
+of the two groups needs to be protected by the drivers. An example of such a
+resource would be a register that controls both the clock rate and the clock
+enable/disable state.
+
+The clock framework is reentrant, in that a driver is allowed to call clock
+framework functions from within its implementation of clock operations. This
+can for instance cause a .set_rate operation of one clock being called from
+within the .set_rate operation of another clock. This case must be considered
+in the driver implementations, but the code flow is usually controlled by the
+driver in that case.
+
+Note that locking must also be considered when code outside of the common
+clock framework needs to access resources used by the clock operations. This
+is considered out of scope of this document.
diff --git a/Documentation/driver-api/component.rst b/Documentation/driver-api/component.rst
new file mode 100644
index 0000000000..57e3759073
--- /dev/null
+++ b/Documentation/driver-api/component.rst
@@ -0,0 +1,19 @@
+.. _component:
+
+======================================
+Component Helper for Aggregate Drivers
+======================================
+
+.. kernel-doc:: drivers/base/component.c
+ :doc: overview
+
+
+API
+===
+
+.. kernel-doc:: include/linux/component.h
+ :internal:
+
+.. kernel-doc:: drivers/base/component.c
+ :export:
+
diff --git a/Documentation/driver-api/connector.rst b/Documentation/driver-api/connector.rst
new file mode 100644
index 0000000000..631b84a48a
--- /dev/null
+++ b/Documentation/driver-api/connector.rst
@@ -0,0 +1,157 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+================
+Kernel Connector
+================
+
+Kernel connector - new netlink based userspace <-> kernel space easy
+to use communication module.
+
+The Connector driver makes it easy to connect various agents using a
+netlink based network. One must register a callback and an identifier.
+When the driver receives a special netlink message with the appropriate
+identifier, the appropriate callback will be called.
+
+From the userspace point of view it's quite straightforward:
+
+ - socket();
+ - bind();
+ - send();
+ - recv();
+
+But if kernelspace wants to use the full power of such connections, the
+driver writer must create special sockets, must know about struct sk_buff
+handling, etc... The Connector driver allows any kernelspace agents to use
+netlink based networking for inter-process communication in a significantly
+easier way::
+
+ int cn_add_callback(const struct cb_id *id, char *name, void (*callback) (struct cn_msg *, struct netlink_skb_parms *));
+ void cn_netlink_send_mult(struct cn_msg *msg, u16 len, u32 portid, u32 __group, int gfp_mask);
+ void cn_netlink_send(struct cn_msg *msg, u32 portid, u32 __group, int gfp_mask);
+
+ struct cb_id
+ {
+ __u32 idx;
+ __u32 val;
+ };
+
+idx and val are unique identifiers which must be registered in the
+connector.h header for in-kernel usage. `void (*callback) (void *)` is a
+callback function which will be called when a message with above idx.val
+is received by the connector core. The argument for that function must
+be dereferenced to `struct cn_msg *`::
+
+ struct cn_msg
+ {
+ struct cb_id id;
+
+ __u32 seq;
+ __u32 ack;
+
+ __u16 len; /* Length of the following data */
+ __u16 flags;
+ __u8 data[0];
+ };
+
+Connector interfaces
+====================
+
+ .. kernel-doc:: include/linux/connector.h
+
+ Note:
+ When registering new callback user, connector core assigns
+ netlink group to the user which is equal to its id.idx.
+
+Protocol description
+====================
+
+The current framework offers a transport layer with fixed headers. The
+recommended protocol which uses such a header is as following:
+
+msg->seq and msg->ack are used to determine message genealogy. When
+someone sends a message, they use a locally unique sequence and random
+acknowledge number. The sequence number may be copied into
+nlmsghdr->nlmsg_seq too.
+
+The sequence number is incremented with each message sent.
+
+If you expect a reply to the message, then the sequence number in the
+received message MUST be the same as in the original message, and the
+acknowledge number MUST be the same + 1.
+
+If we receive a message and its sequence number is not equal to one we
+are expecting, then it is a new message. If we receive a message and
+its sequence number is the same as one we are expecting, but its
+acknowledge is not equal to the sequence number in the original
+message + 1, then it is a new message.
+
+Obviously, the protocol header contains the above id.
+
+The connector allows event notification in the following form: kernel
+driver or userspace process can ask connector to notify it when
+selected ids will be turned on or off (registered or unregistered its
+callback). It is done by sending a special command to the connector
+driver (it also registers itself with id={-1, -1}).
+
+As example of this usage can be found in the cn_test.c module which
+uses the connector to request notification and to send messages.
+
+Reliability
+===========
+
+Netlink itself is not a reliable protocol. That means that messages can
+be lost due to memory pressure or process' receiving queue overflowed,
+so caller is warned that it must be prepared. That is why the struct
+cn_msg [main connector's message header] contains u32 seq and u32 ack
+fields.
+
+Userspace usage
+===============
+
+2.6.14 has a new netlink socket implementation, which by default does not
+allow people to send data to netlink groups other than 1.
+So, if you wish to use a netlink socket (for example using connector)
+with a different group number, the userspace application must subscribe to
+that group first. It can be achieved by the following pseudocode::
+
+ s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
+
+ l_local.nl_family = AF_NETLINK;
+ l_local.nl_groups = 12345;
+ l_local.nl_pid = 0;
+
+ if (bind(s, (struct sockaddr *)&l_local, sizeof(struct sockaddr_nl)) == -1) {
+ perror("bind");
+ close(s);
+ return -1;
+ }
+
+ {
+ int on = l_local.nl_groups;
+ setsockopt(s, 270, 1, &on, sizeof(on));
+ }
+
+Where 270 above is SOL_NETLINK, and 1 is a NETLINK_ADD_MEMBERSHIP socket
+option. To drop a multicast subscription, one should call the above socket
+option with the NETLINK_DROP_MEMBERSHIP parameter which is defined as 0.
+
+2.6.14 netlink code only allows to select a group which is less or equal to
+the maximum group number, which is used at netlink_kernel_create() time.
+In case of connector it is CN_NETLINK_USERS + 0xf, so if you want to use
+group number 12345, you must increment CN_NETLINK_USERS to that number.
+Additional 0xf numbers are allocated to be used by non-in-kernel users.
+
+Due to this limitation, group 0xffffffff does not work now, so one can
+not use add/remove connector's group notifications, but as far as I know,
+only cn_test.c test module used it.
+
+Some work in netlink area is still being done, so things can be changed in
+2.6.15 timeframe, if it will happen, documentation will be updated for that
+kernel.
+
+Code samples
+============
+
+Sample code for a connector test module and user space can be found
+in samples/connector/. To build this code, enable CONFIG_CONNECTOR
+and CONFIG_SAMPLES.
diff --git a/Documentation/driver-api/console.rst b/Documentation/driver-api/console.rst
new file mode 100644
index 0000000000..8394ad7747
--- /dev/null
+++ b/Documentation/driver-api/console.rst
@@ -0,0 +1,152 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============
+Console Drivers
+===============
+
+The Linux kernel has 2 general types of console drivers. The first type is
+assigned by the kernel to all the virtual consoles during the boot process.
+This type will be called 'system driver', and only one system driver is allowed
+to exist. The system driver is persistent and it can never be unloaded, though
+it may become inactive.
+
+The second type has to be explicitly loaded and unloaded. This will be called
+'modular driver' by this document. Multiple modular drivers can coexist at
+any time with each driver sharing the console with other drivers including
+the system driver. However, modular drivers cannot take over the console
+that is currently occupied by another modular driver. (Exception: Drivers that
+call do_take_over_console() will succeed in the takeover regardless of the type
+of driver occupying the consoles.) They can only take over the console that is
+occupied by the system driver. In the same token, if the modular driver is
+released by the console, the system driver will take over.
+
+Modular drivers, from the programmer's point of view, have to call::
+
+ do_take_over_console() - load and bind driver to console layer
+ give_up_console() - unload driver; it will only work if driver
+ is fully unbound
+
+In newer kernels, the following are also available::
+
+ do_register_con_driver()
+ do_unregister_con_driver()
+
+If sysfs is enabled, the contents of /sys/class/vtconsole can be
+examined. This shows the console backends currently registered by the
+system which are named vtcon<n> where <n> is an integer from 0 to 15.
+Thus::
+
+ ls /sys/class/vtconsole
+ . .. vtcon0 vtcon1
+
+Each directory in /sys/class/vtconsole has 3 files::
+
+ ls /sys/class/vtconsole/vtcon0
+ . .. bind name uevent
+
+What do these files signify?
+
+ 1. bind - this is a read/write file. It shows the status of the driver if
+ read, or acts to bind or unbind the driver to the virtual consoles
+ when written to. The possible values are:
+
+ 0
+ - means the driver is not bound and if echo'ed, commands the driver
+ to unbind
+
+ 1
+ - means the driver is bound and if echo'ed, commands the driver to
+ bind
+
+ 2. name - read-only file. Shows the name of the driver in this format::
+
+ cat /sys/class/vtconsole/vtcon0/name
+ (S) VGA+
+
+ '(S)' stands for a (S)ystem driver, i.e., it cannot be directly
+ commanded to bind or unbind
+
+ 'VGA+' is the name of the driver
+
+ cat /sys/class/vtconsole/vtcon1/name
+ (M) frame buffer device
+
+ In this case, '(M)' stands for a (M)odular driver, one that can be
+ directly commanded to bind or unbind.
+
+ 3. uevent - ignore this file
+
+When unbinding, the modular driver is detached first, and then the system
+driver takes over the consoles vacated by the driver. Binding, on the other
+hand, will bind the driver to the consoles that are currently occupied by a
+system driver.
+
+NOTE1:
+ Binding and unbinding must be selected in Kconfig. It's under::
+
+ Device Drivers ->
+ Character devices ->
+ Support for binding and unbinding console drivers
+
+NOTE2:
+ If any of the virtual consoles are in KD_GRAPHICS mode, then binding or
+ unbinding will not succeed. An example of an application that sets the
+ console to KD_GRAPHICS is X.
+
+How useful is this feature? This is very useful for console driver
+developers. By unbinding the driver from the console layer, one can unload the
+driver, make changes, recompile, reload and rebind the driver without any need
+for rebooting the kernel. For regular users who may want to switch from
+framebuffer console to VGA console and vice versa, this feature also makes
+this possible. (NOTE NOTE NOTE: Please read fbcon.txt under Documentation/fb
+for more details.)
+
+Notes for developers
+====================
+
+do_take_over_console() is now broken up into::
+
+ do_register_con_driver()
+ do_bind_con_driver() - private function
+
+give_up_console() is a wrapper to do_unregister_con_driver(), and a driver must
+be fully unbound for this call to succeed. con_is_bound() will check if the
+driver is bound or not.
+
+Guidelines for console driver writers
+=====================================
+
+In order for binding to and unbinding from the console to properly work,
+console drivers must follow these guidelines:
+
+1. All drivers, except system drivers, must call either do_register_con_driver()
+ or do_take_over_console(). do_register_con_driver() will just add the driver
+ to the console's internal list. It won't take over the
+ console. do_take_over_console(), as it name implies, will also take over (or
+ bind to) the console.
+
+2. All resources allocated during con->con_init() must be released in
+ con->con_deinit().
+
+3. All resources allocated in con->con_startup() must be released when the
+ driver, which was previously bound, becomes unbound. The console layer
+ does not have a complementary call to con->con_startup() so it's up to the
+ driver to check when it's legal to release these resources. Calling
+ con_is_bound() in con->con_deinit() will help. If the call returned
+ false(), then it's safe to release the resources. This balance has to be
+ ensured because con->con_startup() can be called again when a request to
+ rebind the driver to the console arrives.
+
+4. Upon exit of the driver, ensure that the driver is totally unbound. If the
+ condition is satisfied, then the driver must call do_unregister_con_driver()
+ or give_up_console().
+
+5. do_unregister_con_driver() can also be called on conditions which make it
+ impossible for the driver to service console requests. This can happen
+ with the framebuffer console that suddenly lost all of its drivers.
+
+The current crop of console drivers should still work correctly, but binding
+and unbinding them may cause problems. With minimal fixes, these drivers can
+be made to work correctly.
+
+Antonino Daplas <adaplas@pol.net>
diff --git a/Documentation/driver-api/cxl/index.rst b/Documentation/driver-api/cxl/index.rst
new file mode 100644
index 0000000000..036e495535
--- /dev/null
+++ b/Documentation/driver-api/cxl/index.rst
@@ -0,0 +1,12 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+====================
+Compute Express Link
+====================
+
+.. toctree::
+ :maxdepth: 1
+
+ memory-devices
+
+.. only:: subproject and html
diff --git a/Documentation/driver-api/cxl/memory-devices.rst b/Documentation/driver-api/cxl/memory-devices.rst
new file mode 100644
index 0000000000..5149ecdc53
--- /dev/null
+++ b/Documentation/driver-api/cxl/memory-devices.rst
@@ -0,0 +1,383 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. include:: <isonum.txt>
+
+===================================
+Compute Express Link Memory Devices
+===================================
+
+A Compute Express Link Memory Device is a CXL component that implements the
+CXL.mem protocol. It contains some amount of volatile memory, persistent memory,
+or both. It is enumerated as a PCI device for configuration and passing
+messages over an MMIO mailbox. Its contribution to the System Physical
+Address space is handled via HDM (Host Managed Device Memory) decoders
+that optionally define a device's contribution to an interleaved address
+range across multiple devices underneath a host-bridge or interleaved
+across host-bridges.
+
+CXL Bus: Theory of Operation
+============================
+Similar to how a RAID driver takes disk objects and assembles them into a new
+logical device, the CXL subsystem is tasked to take PCIe and ACPI objects and
+assemble them into a CXL.mem decode topology. The need for runtime configuration
+of the CXL.mem topology is also similar to RAID in that different environments
+with the same hardware configuration may decide to assemble the topology in
+contrasting ways. One may choose performance (RAID0) striping memory across
+multiple Host Bridges and endpoints while another may opt for fault tolerance
+and disable any striping in the CXL.mem topology.
+
+Platform firmware enumerates a menu of interleave options at the "CXL root port"
+(Linux term for the top of the CXL decode topology). From there, PCIe topology
+dictates which endpoints can participate in which Host Bridge decode regimes.
+Each PCIe Switch in the path between the root and an endpoint introduces a point
+at which the interleave can be split. For example platform firmware may say at a
+given range only decodes to 1 one Host Bridge, but that Host Bridge may in turn
+interleave cycles across multiple Root Ports. An intervening Switch between a
+port and an endpoint may interleave cycles across multiple Downstream Switch
+Ports, etc.
+
+Here is a sample listing of a CXL topology defined by 'cxl_test'. The 'cxl_test'
+module generates an emulated CXL topology of 2 Host Bridges each with 2 Root
+Ports. Each of those Root Ports are connected to 2-way switches with endpoints
+connected to those downstream ports for a total of 8 endpoints::
+
+ # cxl list -BEMPu -b cxl_test
+ {
+ "bus":"root3",
+ "provider":"cxl_test",
+ "ports:root3":[
+ {
+ "port":"port5",
+ "host":"cxl_host_bridge.1",
+ "ports:port5":[
+ {
+ "port":"port8",
+ "host":"cxl_switch_uport.1",
+ "endpoints:port8":[
+ {
+ "endpoint":"endpoint9",
+ "host":"mem2",
+ "memdev":{
+ "memdev":"mem2",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0x1",
+ "numa_node":1,
+ "host":"cxl_mem.1"
+ }
+ },
+ {
+ "endpoint":"endpoint15",
+ "host":"mem6",
+ "memdev":{
+ "memdev":"mem6",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0x5",
+ "numa_node":1,
+ "host":"cxl_mem.5"
+ }
+ }
+ ]
+ },
+ {
+ "port":"port12",
+ "host":"cxl_switch_uport.3",
+ "endpoints:port12":[
+ {
+ "endpoint":"endpoint17",
+ "host":"mem8",
+ "memdev":{
+ "memdev":"mem8",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0x7",
+ "numa_node":1,
+ "host":"cxl_mem.7"
+ }
+ },
+ {
+ "endpoint":"endpoint13",
+ "host":"mem4",
+ "memdev":{
+ "memdev":"mem4",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0x3",
+ "numa_node":1,
+ "host":"cxl_mem.3"
+ }
+ }
+ ]
+ }
+ ]
+ },
+ {
+ "port":"port4",
+ "host":"cxl_host_bridge.0",
+ "ports:port4":[
+ {
+ "port":"port6",
+ "host":"cxl_switch_uport.0",
+ "endpoints:port6":[
+ {
+ "endpoint":"endpoint7",
+ "host":"mem1",
+ "memdev":{
+ "memdev":"mem1",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0",
+ "numa_node":0,
+ "host":"cxl_mem.0"
+ }
+ },
+ {
+ "endpoint":"endpoint14",
+ "host":"mem5",
+ "memdev":{
+ "memdev":"mem5",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0x4",
+ "numa_node":0,
+ "host":"cxl_mem.4"
+ }
+ }
+ ]
+ },
+ {
+ "port":"port10",
+ "host":"cxl_switch_uport.2",
+ "endpoints:port10":[
+ {
+ "endpoint":"endpoint16",
+ "host":"mem7",
+ "memdev":{
+ "memdev":"mem7",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0x6",
+ "numa_node":0,
+ "host":"cxl_mem.6"
+ }
+ },
+ {
+ "endpoint":"endpoint11",
+ "host":"mem3",
+ "memdev":{
+ "memdev":"mem3",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0x2",
+ "numa_node":0,
+ "host":"cxl_mem.2"
+ }
+ }
+ ]
+ }
+ ]
+ }
+ ]
+ }
+
+In that listing each "root", "port", and "endpoint" object correspond a kernel
+'struct cxl_port' object. A 'cxl_port' is a device that can decode CXL.mem to
+its descendants. So "root" claims non-PCIe enumerable platform decode ranges and
+decodes them to "ports", "ports" decode to "endpoints", and "endpoints"
+represent the decode from SPA (System Physical Address) to DPA (Device Physical
+Address).
+
+Continuing the RAID analogy, disks have both topology metadata and on device
+metadata that determine RAID set assembly. CXL Port topology and CXL Port link
+status is metadata for CXL.mem set assembly. The CXL Port topology is enumerated
+by the arrival of a CXL.mem device. I.e. unless and until the PCIe core attaches
+the cxl_pci driver to a CXL Memory Expander there is no role for CXL Port
+objects. Conversely for hot-unplug / removal scenarios, there is no need for
+the Linux PCI core to tear down switch-level CXL resources because the endpoint
+->remove() event cleans up the port data that was established to support that
+Memory Expander.
+
+The port metadata and potential decode schemes that a give memory device may
+participate can be determined via a command like::
+
+ # cxl list -BDMu -d root -m mem3
+ {
+ "bus":"root3",
+ "provider":"cxl_test",
+ "decoders:root3":[
+ {
+ "decoder":"decoder3.1",
+ "resource":"0x8030000000",
+ "size":"512.00 MiB (536.87 MB)",
+ "volatile_capable":true,
+ "nr_targets":2
+ },
+ {
+ "decoder":"decoder3.3",
+ "resource":"0x8060000000",
+ "size":"512.00 MiB (536.87 MB)",
+ "pmem_capable":true,
+ "nr_targets":2
+ },
+ {
+ "decoder":"decoder3.0",
+ "resource":"0x8020000000",
+ "size":"256.00 MiB (268.44 MB)",
+ "volatile_capable":true,
+ "nr_targets":1
+ },
+ {
+ "decoder":"decoder3.2",
+ "resource":"0x8050000000",
+ "size":"256.00 MiB (268.44 MB)",
+ "pmem_capable":true,
+ "nr_targets":1
+ }
+ ],
+ "memdevs:root3":[
+ {
+ "memdev":"mem3",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0x2",
+ "numa_node":0,
+ "host":"cxl_mem.2"
+ }
+ ]
+ }
+
+...which queries the CXL topology to ask "given CXL Memory Expander with a kernel
+device name of 'mem3' which platform level decode ranges may this device
+participate". A given expander can participate in multiple CXL.mem interleave
+sets simultaneously depending on how many decoder resource it has. In this
+example mem3 can participate in one or more of a PMEM interleave that spans to
+Host Bridges, a PMEM interleave that targets a single Host Bridge, a Volatile
+memory interleave that spans 2 Host Bridges, and a Volatile memory interleave
+that only targets a single Host Bridge.
+
+Conversely the memory devices that can participate in a given platform level
+decode scheme can be determined via a command like the following::
+
+ # cxl list -MDu -d 3.2
+ [
+ {
+ "memdevs":[
+ {
+ "memdev":"mem1",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0",
+ "numa_node":0,
+ "host":"cxl_mem.0"
+ },
+ {
+ "memdev":"mem5",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0x4",
+ "numa_node":0,
+ "host":"cxl_mem.4"
+ },
+ {
+ "memdev":"mem7",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0x6",
+ "numa_node":0,
+ "host":"cxl_mem.6"
+ },
+ {
+ "memdev":"mem3",
+ "pmem_size":"256.00 MiB (268.44 MB)",
+ "ram_size":"256.00 MiB (268.44 MB)",
+ "serial":"0x2",
+ "numa_node":0,
+ "host":"cxl_mem.2"
+ }
+ ]
+ },
+ {
+ "root decoders":[
+ {
+ "decoder":"decoder3.2",
+ "resource":"0x8050000000",
+ "size":"256.00 MiB (268.44 MB)",
+ "pmem_capable":true,
+ "nr_targets":1
+ }
+ ]
+ }
+ ]
+
+...where the naming scheme for decoders is "decoder<port_id>.<instance_id>".
+
+Driver Infrastructure
+=====================
+
+This section covers the driver infrastructure for a CXL memory device.
+
+CXL Memory Device
+-----------------
+
+.. kernel-doc:: drivers/cxl/pci.c
+ :doc: cxl pci
+
+.. kernel-doc:: drivers/cxl/pci.c
+ :internal:
+
+.. kernel-doc:: drivers/cxl/mem.c
+ :doc: cxl mem
+
+CXL Port
+--------
+.. kernel-doc:: drivers/cxl/port.c
+ :doc: cxl port
+
+CXL Core
+--------
+.. kernel-doc:: drivers/cxl/cxl.h
+ :doc: cxl objects
+
+.. kernel-doc:: drivers/cxl/cxl.h
+ :internal:
+
+.. kernel-doc:: drivers/cxl/core/port.c
+ :doc: cxl core
+
+.. kernel-doc:: drivers/cxl/core/port.c
+ :identifiers:
+
+.. kernel-doc:: drivers/cxl/core/pci.c
+ :doc: cxl core pci
+
+.. kernel-doc:: drivers/cxl/core/pci.c
+ :identifiers:
+
+.. kernel-doc:: drivers/cxl/core/pmem.c
+ :doc: cxl pmem
+
+.. kernel-doc:: drivers/cxl/core/regs.c
+ :doc: cxl registers
+
+.. kernel-doc:: drivers/cxl/core/mbox.c
+ :doc: cxl mbox
+
+CXL Regions
+-----------
+.. kernel-doc:: drivers/cxl/core/region.c
+ :doc: cxl core region
+
+.. kernel-doc:: drivers/cxl/core/region.c
+ :identifiers:
+
+External Interfaces
+===================
+
+CXL IOCTL Interface
+-------------------
+
+.. kernel-doc:: include/uapi/linux/cxl_mem.h
+ :doc: UAPI
+
+.. kernel-doc:: include/uapi/linux/cxl_mem.h
+ :internal:
diff --git a/Documentation/driver-api/dcdbas.rst b/Documentation/driver-api/dcdbas.rst
new file mode 100644
index 0000000000..309cc57a7c
--- /dev/null
+++ b/Documentation/driver-api/dcdbas.rst
@@ -0,0 +1,99 @@
+===================================
+Dell Systems Management Base Driver
+===================================
+
+Overview
+========
+
+The Dell Systems Management Base Driver provides a sysfs interface for
+systems management software such as Dell OpenManage to perform system
+management interrupts and host control actions (system power cycle or
+power off after OS shutdown) on certain Dell systems.
+
+Dell OpenManage requires this driver on the following Dell PowerEdge systems:
+300, 1300, 1400, 400SC, 500SC, 1500SC, 1550, 600SC, 1600SC, 650, 1655MC,
+700, and 750. Other Dell software such as the open source libsmbios project
+is expected to make use of this driver, and it may include the use of this
+driver on other Dell systems.
+
+The Dell libsmbios project aims towards providing access to as much BIOS
+information as possible. See http://linux.dell.com/libsmbios/main/ for
+more information about the libsmbios project.
+
+
+System Management Interrupt
+===========================
+
+On some Dell systems, systems management software must access certain
+management information via a system management interrupt (SMI). The SMI data
+buffer must reside in 32-bit address space, and the physical address of the
+buffer is required for the SMI. The driver maintains the memory required for
+the SMI and provides a way for the application to generate the SMI.
+The driver creates the following sysfs entries for systems management
+software to perform these system management interrupts::
+
+ /sys/devices/platform/dcdbas/smi_data
+ /sys/devices/platform/dcdbas/smi_data_buf_phys_addr
+ /sys/devices/platform/dcdbas/smi_data_buf_size
+ /sys/devices/platform/dcdbas/smi_request
+
+Systems management software must perform the following steps to execute
+a SMI using this driver:
+
+1) Lock smi_data.
+2) Write system management command to smi_data.
+3) Write "1" to smi_request to generate a calling interface SMI or
+ "2" to generate a raw SMI.
+4) Read system management command response from smi_data.
+5) Unlock smi_data.
+
+
+Host Control Action
+===================
+
+Dell OpenManage supports a host control feature that allows the administrator
+to perform a power cycle or power off of the system after the OS has finished
+shutting down. On some Dell systems, this host control feature requires that
+a driver perform a SMI after the OS has finished shutting down.
+
+The driver creates the following sysfs entries for systems management software
+to schedule the driver to perform a power cycle or power off host control
+action after the system has finished shutting down:
+
+/sys/devices/platform/dcdbas/host_control_action
+/sys/devices/platform/dcdbas/host_control_smi_type
+/sys/devices/platform/dcdbas/host_control_on_shutdown
+
+Dell OpenManage performs the following steps to execute a power cycle or
+power off host control action using this driver:
+
+1) Write host control action to be performed to host_control_action.
+2) Write type of SMI that driver needs to perform to host_control_smi_type.
+3) Write "1" to host_control_on_shutdown to enable host control action.
+4) Initiate OS shutdown.
+ (Driver will perform host control SMI when it is notified that the OS
+ has finished shutting down.)
+
+
+Host Control SMI Type
+=====================
+
+The following table shows the value to write to host_control_smi_type to
+perform a power cycle or power off host control action:
+
+=================== =====================
+PowerEdge System Host Control SMI Type
+=================== =====================
+ 300 HC_SMITYPE_TYPE1
+ 1300 HC_SMITYPE_TYPE1
+ 1400 HC_SMITYPE_TYPE2
+ 500SC HC_SMITYPE_TYPE2
+ 1500SC HC_SMITYPE_TYPE2
+ 1550 HC_SMITYPE_TYPE2
+ 600SC HC_SMITYPE_TYPE2
+ 1600SC HC_SMITYPE_TYPE2
+ 650 HC_SMITYPE_TYPE2
+ 1655MC HC_SMITYPE_TYPE2
+ 700 HC_SMITYPE_TYPE3
+ 750 HC_SMITYPE_TYPE3
+=================== =====================
diff --git a/Documentation/driver-api/devfreq.rst b/Documentation/driver-api/devfreq.rst
new file mode 100644
index 0000000000..4a0bf87a3b
--- /dev/null
+++ b/Documentation/driver-api/devfreq.rst
@@ -0,0 +1,30 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+========================
+Device Frequency Scaling
+========================
+
+Introduction
+------------
+
+This framework provides a standard kernel interface for Dynamic Voltage and
+Frequency Switching on arbitrary devices.
+
+It exposes controls for adjusting frequency through sysfs files which are
+similar to the cpufreq subsystem.
+
+Devices for which current usage can be measured can have their frequency
+automatically adjusted by governors.
+
+API
+---
+
+Device drivers need to initialize a :c:type:`devfreq_profile` and call the
+:c:func:`devfreq_add_device` function to create a :c:type:`devfreq` instance.
+
+.. kernel-doc:: include/linux/devfreq.h
+.. kernel-doc:: include/linux/devfreq-event.h
+.. kernel-doc:: drivers/devfreq/devfreq.c
+ :export:
+.. kernel-doc:: drivers/devfreq/devfreq-event.c
+ :export:
diff --git a/Documentation/driver-api/device-io.rst b/Documentation/driver-api/device-io.rst
new file mode 100644
index 0000000000..2c7abd234f
--- /dev/null
+++ b/Documentation/driver-api/device-io.rst
@@ -0,0 +1,521 @@
+.. Copyright 2001 Matthew Wilcox
+..
+.. This documentation is free software; you can redistribute
+.. it and/or modify it under the terms of the GNU General Public
+.. License as published by the Free Software Foundation; either
+.. version 2 of the License, or (at your option) any later
+.. version.
+
+===============================
+Bus-Independent Device Accesses
+===============================
+
+:Author: Matthew Wilcox
+:Author: Alan Cox
+
+Introduction
+============
+
+Linux provides an API which abstracts performing IO across all busses
+and devices, allowing device drivers to be written independently of bus
+type.
+
+Memory Mapped IO
+================
+
+Getting Access to the Device
+----------------------------
+
+The most widely supported form of IO is memory mapped IO. That is, a
+part of the CPU's address space is interpreted not as accesses to
+memory, but as accesses to a device. Some architectures define devices
+to be at a fixed address, but most have some method of discovering
+devices. The PCI bus walk is a good example of such a scheme. This
+document does not cover how to receive such an address, but assumes you
+are starting with one. Physical addresses are of type unsigned long.
+
+This address should not be used directly. Instead, to get an address
+suitable for passing to the accessor functions described below, you
+should call ioremap(). An address suitable for accessing
+the device will be returned to you.
+
+After you've finished using the device (say, in your module's exit
+routine), call iounmap() in order to return the address
+space to the kernel. Most architectures allocate new address space each
+time you call ioremap(), and they can run out unless you
+call iounmap().
+
+Accessing the device
+--------------------
+
+The part of the interface most used by drivers is reading and writing
+memory-mapped registers on the device. Linux provides interfaces to read
+and write 8-bit, 16-bit, 32-bit and 64-bit quantities. Due to a
+historical accident, these are named byte, word, long and quad accesses.
+Both read and write accesses are supported; there is no prefetch support
+at this time.
+
+The functions are named readb(), readw(), readl(), readq(),
+readb_relaxed(), readw_relaxed(), readl_relaxed(), readq_relaxed(),
+writeb(), writew(), writel() and writeq().
+
+Some devices (such as framebuffers) would like to use larger transfers than
+8 bytes at a time. For these devices, the memcpy_toio(),
+memcpy_fromio() and memset_io() functions are
+provided. Do not use memset or memcpy on IO addresses; they are not
+guaranteed to copy data in order.
+
+The read and write functions are defined to be ordered. That is the
+compiler is not permitted to reorder the I/O sequence. When the ordering
+can be compiler optimised, you can use __readb() and friends to
+indicate the relaxed ordering. Use this with care.
+
+While the basic functions are defined to be synchronous with respect to
+each other and ordered with respect to each other the busses the devices
+sit on may themselves have asynchronicity. In particular many authors
+are burned by the fact that PCI bus writes are posted asynchronously. A
+driver author must issue a read from the same device to ensure that
+writes have occurred in the specific cases the author cares. This kind
+of property cannot be hidden from driver writers in the API. In some
+cases, the read used to flush the device may be expected to fail (if the
+card is resetting, for example). In that case, the read should be done
+from config space, which is guaranteed to soft-fail if the card doesn't
+respond.
+
+The following is an example of flushing a write to a device when the
+driver would like to ensure the write's effects are visible prior to
+continuing execution::
+
+ static inline void
+ qla1280_disable_intrs(struct scsi_qla_host *ha)
+ {
+ struct device_reg *reg;
+
+ reg = ha->iobase;
+ /* disable risc and host interrupts */
+ WRT_REG_WORD(&reg->ictrl, 0);
+ /*
+ * The following read will ensure that the above write
+ * has been received by the device before we return from this
+ * function.
+ */
+ RD_REG_WORD(&reg->ictrl);
+ ha->flags.ints_enabled = 0;
+ }
+
+PCI ordering rules also guarantee that PIO read responses arrive after any
+outstanding DMA writes from that bus, since for some devices the result of
+a readb() call may signal to the driver that a DMA transaction is
+complete. In many cases, however, the driver may want to indicate that the
+next readb() call has no relation to any previous DMA writes
+performed by the device. The driver can use readb_relaxed() for
+these cases, although only some platforms will honor the relaxed
+semantics. Using the relaxed read functions will provide significant
+performance benefits on platforms that support it. The qla2xxx driver
+provides examples of how to use readX_relaxed(). In many cases, a majority
+of the driver's readX() calls can safely be converted to readX_relaxed()
+calls, since only a few will indicate or depend on DMA completion.
+
+Port Space Accesses
+===================
+
+Port Space Explained
+--------------------
+
+Another form of IO commonly supported is Port Space. This is a range of
+addresses separate to the normal memory address space. Access to these
+addresses is generally not as fast as accesses to the memory mapped
+addresses, and it also has a potentially smaller address space.
+
+Unlike memory mapped IO, no preparation is required to access port
+space.
+
+Accessing Port Space
+--------------------
+
+Accesses to this space are provided through a set of functions which
+allow 8-bit, 16-bit and 32-bit accesses; also known as byte, word and
+long. These functions are inb(), inw(),
+inl(), outb(), outw() and
+outl().
+
+Some variants are provided for these functions. Some devices require
+that accesses to their ports are slowed down. This functionality is
+provided by appending a ``_p`` to the end of the function.
+There are also equivalents to memcpy. The ins() and
+outs() functions copy bytes, words or longs to the given
+port.
+
+__iomem pointer tokens
+======================
+
+The data type for an MMIO address is an ``__iomem`` qualified pointer, such as
+``void __iomem *reg``. On most architectures it is a regular pointer that
+points to a virtual memory address and can be offset or dereferenced, but in
+portable code, it must only be passed from and to functions that explicitly
+operated on an ``__iomem`` token, in particular the ioremap() and
+readl()/writel() functions. The 'sparse' semantic code checker can be used to
+verify that this is done correctly.
+
+While on most architectures, ioremap() creates a page table entry for an
+uncached virtual address pointing to the physical MMIO address, some
+architectures require special instructions for MMIO, and the ``__iomem`` pointer
+just encodes the physical address or an offsettable cookie that is interpreted
+by readl()/writel().
+
+Differences between I/O access functions
+========================================
+
+readq(), readl(), readw(), readb(), writeq(), writel(), writew(), writeb()
+
+ These are the most generic accessors, providing serialization against other
+ MMIO accesses and DMA accesses as well as fixed endianness for accessing
+ little-endian PCI devices and on-chip peripherals. Portable device drivers
+ should generally use these for any access to ``__iomem`` pointers.
+
+ Note that posted writes are not strictly ordered against a spinlock, see
+ Documentation/driver-api/io_ordering.rst.
+
+readq_relaxed(), readl_relaxed(), readw_relaxed(), readb_relaxed(),
+writeq_relaxed(), writel_relaxed(), writew_relaxed(), writeb_relaxed()
+
+ On architectures that require an expensive barrier for serializing against
+ DMA, these "relaxed" versions of the MMIO accessors only serialize against
+ each other, but contain a less expensive barrier operation. A device driver
+ might use these in a particularly performance sensitive fast path, with a
+ comment that explains why the usage in a specific location is safe without
+ the extra barriers.
+
+ See memory-barriers.txt for a more detailed discussion on the precise ordering
+ guarantees of the non-relaxed and relaxed versions.
+
+ioread64(), ioread32(), ioread16(), ioread8(),
+iowrite64(), iowrite32(), iowrite16(), iowrite8()
+
+ These are an alternative to the normal readl()/writel() functions, with almost
+ identical behavior, but they can also operate on ``__iomem`` tokens returned
+ for mapping PCI I/O space with pci_iomap() or ioport_map(). On architectures
+ that require special instructions for I/O port access, this adds a small
+ overhead for an indirect function call implemented in lib/iomap.c, while on
+ other architectures, these are simply aliases.
+
+ioread64be(), ioread32be(), ioread16be()
+iowrite64be(), iowrite32be(), iowrite16be()
+
+ These behave in the same way as the ioread32()/iowrite32() family, but with
+ reversed byte order, for accessing devices with big-endian MMIO registers.
+ Device drivers that can operate on either big-endian or little-endian
+ registers may have to implement a custom wrapper function that picks one or
+ the other depending on which device was found.
+
+ Note: On some architectures, the normal readl()/writel() functions
+ traditionally assume that devices are the same endianness as the CPU, while
+ using a hardware byte-reverse on the PCI bus when running a big-endian kernel.
+ Drivers that use readl()/writel() this way are generally not portable, but
+ tend to be limited to a particular SoC.
+
+hi_lo_readq(), lo_hi_readq(), hi_lo_readq_relaxed(), lo_hi_readq_relaxed(),
+ioread64_lo_hi(), ioread64_hi_lo(), ioread64be_lo_hi(), ioread64be_hi_lo(),
+hi_lo_writeq(), lo_hi_writeq(), hi_lo_writeq_relaxed(), lo_hi_writeq_relaxed(),
+iowrite64_lo_hi(), iowrite64_hi_lo(), iowrite64be_lo_hi(), iowrite64be_hi_lo()
+
+ Some device drivers have 64-bit registers that cannot be accessed atomically
+ on 32-bit architectures but allow two consecutive 32-bit accesses instead.
+ Since it depends on the particular device which of the two halves has to be
+ accessed first, a helper is provided for each combination of 64-bit accessors
+ with either low/high or high/low word ordering. A device driver must include
+ either <linux/io-64-nonatomic-lo-hi.h> or <linux/io-64-nonatomic-hi-lo.h> to
+ get the function definitions along with helpers that redirect the normal
+ readq()/writeq() to them on architectures that do not provide 64-bit access
+ natively.
+
+__raw_readq(), __raw_readl(), __raw_readw(), __raw_readb(),
+__raw_writeq(), __raw_writel(), __raw_writew(), __raw_writeb()
+
+ These are low-level MMIO accessors without barriers or byteorder changes and
+ architecture specific behavior. Accesses are usually atomic in the sense that
+ a four-byte __raw_readl() does not get split into individual byte loads, but
+ multiple consecutive accesses can be combined on the bus. In portable code, it
+ is only safe to use these to access memory behind a device bus but not MMIO
+ registers, as there are no ordering guarantees with regard to other MMIO
+ accesses or even spinlocks. The byte order is generally the same as for normal
+ memory, so unlike the other functions, these can be used to copy data between
+ kernel memory and device memory.
+
+inl(), inw(), inb(), outl(), outw(), outb()
+
+ PCI I/O port resources traditionally require separate helpers as they are
+ implemented using special instructions on the x86 architecture. On most other
+ architectures, these are mapped to readl()/writel() style accessors
+ internally, usually pointing to a fixed area in virtual memory. Instead of an
+ ``__iomem`` pointer, the address is a 32-bit integer token to identify a port
+ number. PCI requires I/O port access to be non-posted, meaning that an outb()
+ must complete before the following code executes, while a normal writeb() may
+ still be in progress. On architectures that correctly implement this, I/O port
+ access is therefore ordered against spinlocks. Many non-x86 PCI host bridge
+ implementations and CPU architectures however fail to implement non-posted I/O
+ space on PCI, so they can end up being posted on such hardware.
+
+ In some architectures, the I/O port number space has a 1:1 mapping to
+ ``__iomem`` pointers, but this is not recommended and device drivers should
+ not rely on that for portability. Similarly, an I/O port number as described
+ in a PCI base address register may not correspond to the port number as seen
+ by a device driver. Portable drivers need to read the port number for the
+ resource provided by the kernel.
+
+ There are no direct 64-bit I/O port accessors, but pci_iomap() in combination
+ with ioread64/iowrite64 can be used instead.
+
+inl_p(), inw_p(), inb_p(), outl_p(), outw_p(), outb_p()
+
+ On ISA devices that require specific timing, the _p versions of the I/O
+ accessors add a small delay. On architectures that do not have ISA buses,
+ these are aliases to the normal inb/outb helpers.
+
+readsq, readsl, readsw, readsb
+writesq, writesl, writesw, writesb
+ioread64_rep, ioread32_rep, ioread16_rep, ioread8_rep
+iowrite64_rep, iowrite32_rep, iowrite16_rep, iowrite8_rep
+insl, insw, insb, outsl, outsw, outsb
+
+ These are helpers that access the same address multiple times, usually to copy
+ data between kernel memory byte stream and a FIFO buffer. Unlike the normal
+ MMIO accessors, these do not perform a byteswap on big-endian kernels, so the
+ first byte in the FIFO register corresponds to the first byte in the memory
+ buffer regardless of the architecture.
+
+Device memory mapping modes
+===========================
+
+Some architectures support multiple modes for mapping device memory.
+ioremap_*() variants provide a common abstraction around these
+architecture-specific modes, with a shared set of semantics.
+
+ioremap() is the most common mapping type, and is applicable to typical device
+memory (e.g. I/O registers). Other modes can offer weaker or stronger
+guarantees, if supported by the architecture. From most to least common, they
+are as follows:
+
+ioremap()
+---------
+
+The default mode, suitable for most memory-mapped devices, e.g. control
+registers. Memory mapped using ioremap() has the following characteristics:
+
+* Uncached - CPU-side caches are bypassed, and all reads and writes are handled
+ directly by the device
+* No speculative operations - the CPU may not issue a read or write to this
+ memory, unless the instruction that does so has been reached in committed
+ program flow.
+* No reordering - The CPU may not reorder accesses to this memory mapping with
+ respect to each other. On some architectures, this relies on barriers in
+ readl_relaxed()/writel_relaxed().
+* No repetition - The CPU may not issue multiple reads or writes for a single
+ program instruction.
+* No write-combining - Each I/O operation results in one discrete read or write
+ being issued to the device, and multiple writes are not combined into larger
+ writes. This may or may not be enforced when using __raw I/O accessors or
+ pointer dereferences.
+* Non-executable - The CPU is not allowed to speculate instruction execution
+ from this memory (it probably goes without saying, but you're also not
+ allowed to jump into device memory).
+
+On many platforms and buses (e.g. PCI), writes issued through ioremap()
+mappings are posted, which means that the CPU does not wait for the write to
+actually reach the target device before retiring the write instruction.
+
+On many platforms, I/O accesses must be aligned with respect to the access
+size; failure to do so will result in an exception or unpredictable results.
+
+ioremap_wc()
+------------
+
+Maps I/O memory as normal memory with write combining. Unlike ioremap(),
+
+* The CPU may speculatively issue reads from the device that the program
+ didn't actually execute, and may choose to basically read whatever it wants.
+* The CPU may reorder operations as long as the result is consistent from the
+ program's point of view.
+* The CPU may write to the same location multiple times, even when the program
+ issued a single write.
+* The CPU may combine several writes into a single larger write.
+
+This mode is typically used for video framebuffers, where it can increase
+performance of writes. It can also be used for other blocks of memory in
+devices (e.g. buffers or shared memory), but care must be taken as accesses are
+not guaranteed to be ordered with respect to normal ioremap() MMIO register
+accesses without explicit barriers.
+
+On a PCI bus, it is usually safe to use ioremap_wc() on MMIO areas marked as
+``IORESOURCE_PREFETCH``, but it may not be used on those without the flag.
+For on-chip devices, there is no corresponding flag, but a driver can use
+ioremap_wc() on a device that is known to be safe.
+
+ioremap_wt()
+------------
+
+Maps I/O memory as normal memory with write-through caching. Like ioremap_wc(),
+but also,
+
+* The CPU may cache writes issued to and reads from the device, and serve reads
+ from that cache.
+
+This mode is sometimes used for video framebuffers, where drivers still expect
+writes to reach the device in a timely manner (and not be stuck in the CPU
+cache), but reads may be served from the cache for efficiency. However, it is
+rarely useful these days, as framebuffer drivers usually perform writes only,
+for which ioremap_wc() is more efficient (as it doesn't needlessly trash the
+cache). Most drivers should not use this.
+
+ioremap_np()
+------------
+
+Like ioremap(), but explicitly requests non-posted write semantics. On some
+architectures and buses, ioremap() mappings have posted write semantics, which
+means that writes can appear to "complete" from the point of view of the
+CPU before the written data actually arrives at the target device. Writes are
+still ordered with respect to other writes and reads from the same device, but
+due to the posted write semantics, this is not the case with respect to other
+devices. ioremap_np() explicitly requests non-posted semantics, which means
+that the write instruction will not appear to complete until the device has
+received (and to some platform-specific extent acknowledged) the written data.
+
+This mapping mode primarily exists to cater for platforms with bus fabrics that
+require this particular mapping mode to work correctly. These platforms set the
+``IORESOURCE_MEM_NONPOSTED`` flag for a resource that requires ioremap_np()
+semantics and portable drivers should use an abstraction that automatically
+selects it where appropriate (see the `Higher-level ioremap abstractions`_
+section below).
+
+The bare ioremap_np() is only available on some architectures; on others, it
+always returns NULL. Drivers should not normally use it, unless they are
+platform-specific or they derive benefit from non-posted writes where
+supported, and can fall back to ioremap() otherwise. The normal approach to
+ensure posted write completion is to do a dummy read after a write as
+explained in `Accessing the device`_, which works with ioremap() on all
+platforms.
+
+ioremap_np() should never be used for PCI drivers. PCI memory space writes are
+always posted, even on architectures that otherwise implement ioremap_np().
+Using ioremap_np() for PCI BARs will at best result in posted write semantics,
+and at worst result in complete breakage.
+
+Note that non-posted write semantics are orthogonal to CPU-side ordering
+guarantees. A CPU may still choose to issue other reads or writes before a
+non-posted write instruction retires. See the previous section on MMIO access
+functions for details on the CPU side of things.
+
+ioremap_uc()
+------------
+
+ioremap_uc() behaves like ioremap() except that on the x86 architecture without
+'PAT' mode, it marks memory as uncached even when the MTRR has designated
+it as cacheable, see Documentation/arch/x86/pat.rst.
+
+Portable drivers should avoid the use of ioremap_uc().
+
+ioremap_cache()
+---------------
+
+ioremap_cache() effectively maps I/O memory as normal RAM. CPU write-back
+caches can be used, and the CPU is free to treat the device as if it were a
+block of RAM. This should never be used for device memory which has side
+effects of any kind, or which does not return the data previously written on
+read.
+
+It should also not be used for actual RAM, as the returned pointer is an
+``__iomem`` token. memremap() can be used for mapping normal RAM that is outside
+of the linear kernel memory area to a regular pointer.
+
+Portable drivers should avoid the use of ioremap_cache().
+
+Architecture example
+--------------------
+
+Here is how the above modes map to memory attribute settings on the ARM64
+architecture:
+
++------------------------+--------------------------------------------+
+| API | Memory region type and cacheability |
++------------------------+--------------------------------------------+
+| ioremap_np() | Device-nGnRnE |
++------------------------+--------------------------------------------+
+| ioremap() | Device-nGnRE |
++------------------------+--------------------------------------------+
+| ioremap_uc() | (not implemented) |
++------------------------+--------------------------------------------+
+| ioremap_wc() | Normal-Non Cacheable |
++------------------------+--------------------------------------------+
+| ioremap_wt() | (not implemented; fallback to ioremap) |
++------------------------+--------------------------------------------+
+| ioremap_cache() | Normal-Write-Back Cacheable |
++------------------------+--------------------------------------------+
+
+Higher-level ioremap abstractions
+=================================
+
+Instead of using the above raw ioremap() modes, drivers are encouraged to use
+higher-level APIs. These APIs may implement platform-specific logic to
+automatically choose an appropriate ioremap mode on any given bus, allowing for
+a platform-agnostic driver to work on those platforms without any special
+cases. At the time of this writing, the following ioremap() wrappers have such
+logic:
+
+devm_ioremap_resource()
+
+ Can automatically select ioremap_np() over ioremap() according to platform
+ requirements, if the ``IORESOURCE_MEM_NONPOSTED`` flag is set on the struct
+ resource. Uses devres to automatically unmap the resource when the driver
+ probe() function fails or a device in unbound from its driver.
+
+ Documented in Documentation/driver-api/driver-model/devres.rst.
+
+of_address_to_resource()
+
+ Automatically sets the ``IORESOURCE_MEM_NONPOSTED`` flag for platforms that
+ require non-posted writes for certain buses (see the nonposted-mmio and
+ posted-mmio device tree properties).
+
+of_iomap()
+
+ Maps the resource described in a ``reg`` property in the device tree, doing
+ all required translations. Automatically selects ioremap_np() according to
+ platform requirements, as above.
+
+pci_ioremap_bar(), pci_ioremap_wc_bar()
+
+ Maps the resource described in a PCI base address without having to extract
+ the physical address first.
+
+pci_iomap(), pci_iomap_wc()
+
+ Like pci_ioremap_bar()/pci_ioremap_bar(), but also works on I/O space when
+ used together with ioread32()/iowrite32() and similar accessors
+
+pcim_iomap()
+
+ Like pci_iomap(), but uses devres to automatically unmap the resource when
+ the driver probe() function fails or a device in unbound from its driver
+
+ Documented in Documentation/driver-api/driver-model/devres.rst.
+
+Not using these wrappers may make drivers unusable on certain platforms with
+stricter rules for mapping I/O memory.
+
+Generalizing Access to System and I/O Memory
+============================================
+
+.. kernel-doc:: include/linux/iosys-map.h
+ :doc: overview
+
+.. kernel-doc:: include/linux/iosys-map.h
+ :internal:
+
+Public Functions Provided
+=========================
+
+.. kernel-doc:: arch/x86/include/asm/io.h
+ :internal:
+
+.. kernel-doc:: lib/pci_iomap.c
+ :export:
diff --git a/Documentation/driver-api/device_link.rst b/Documentation/driver-api/device_link.rst
new file mode 100644
index 0000000000..ee913ae163
--- /dev/null
+++ b/Documentation/driver-api/device_link.rst
@@ -0,0 +1,320 @@
+.. _device_link:
+
+============
+Device links
+============
+
+By default, the driver core only enforces dependencies between devices
+that are borne out of a parent/child relationship within the device
+hierarchy: When suspending, resuming or shutting down the system, devices
+are ordered based on this relationship, i.e. children are always suspended
+before their parent, and the parent is always resumed before its children.
+
+Sometimes there is a need to represent device dependencies beyond the
+mere parent/child relationship, e.g. between siblings, and have the
+driver core automatically take care of them.
+
+Secondly, the driver core by default does not enforce any driver presence
+dependencies, i.e. that one device must be bound to a driver before
+another one can probe or function correctly.
+
+Often these two dependency types come together, so a device depends on
+another one both with regards to driver presence *and* with regards to
+suspend/resume and shutdown ordering.
+
+Device links allow representation of such dependencies in the driver core.
+
+In its standard or *managed* form, a device link combines *both* dependency
+types: It guarantees correct suspend/resume and shutdown ordering between a
+"supplier" device and its "consumer" devices, and it guarantees driver
+presence on the supplier. The consumer devices are not probed before the
+supplier is bound to a driver, and they're unbound before the supplier
+is unbound.
+
+When driver presence on the supplier is irrelevant and only correct
+suspend/resume and shutdown ordering is needed, the device link may
+simply be set up with the ``DL_FLAG_STATELESS`` flag. In other words,
+enforcing driver presence on the supplier is optional.
+
+Another optional feature is runtime PM integration: By setting the
+``DL_FLAG_PM_RUNTIME`` flag on addition of the device link, the PM core
+is instructed to runtime resume the supplier and keep it active
+whenever and for as long as the consumer is runtime resumed.
+
+Usage
+=====
+
+The earliest point in time when device links can be added is after
+:c:func:`device_add()` has been called for the supplier and
+:c:func:`device_initialize()` has been called for the consumer.
+
+It is legal to add them later, but care must be taken that the system
+remains in a consistent state: E.g. a device link cannot be added in
+the midst of a suspend/resume transition, so either commencement of
+such a transition needs to be prevented with :c:func:`lock_system_sleep()`,
+or the device link needs to be added from a function which is guaranteed
+not to run in parallel to a suspend/resume transition, such as from a
+device ``->probe`` callback or a boot-time PCI quirk.
+
+Another example for an inconsistent state would be a device link that
+represents a driver presence dependency, yet is added from the consumer's
+``->probe`` callback while the supplier hasn't started to probe yet: Had the
+driver core known about the device link earlier, it wouldn't have probed the
+consumer in the first place. The onus is thus on the consumer to check
+presence of the supplier after adding the link, and defer probing on
+non-presence. [Note that it is valid to create a link from the consumer's
+``->probe`` callback while the supplier is still probing, but the consumer must
+know that the supplier is functional already at the link creation time (that is
+the case, for instance, if the consumer has just acquired some resources that
+would not have been available had the supplier not been functional then).]
+
+If a device link with ``DL_FLAG_STATELESS`` set (i.e. a stateless device link)
+is added in the ``->probe`` callback of the supplier or consumer driver, it is
+typically deleted in its ``->remove`` callback for symmetry. That way, if the
+driver is compiled as a module, the device link is added on module load and
+orderly deleted on unload. The same restrictions that apply to device link
+addition (e.g. exclusion of a parallel suspend/resume transition) apply equally
+to deletion. Device links managed by the driver core are deleted automatically
+by it.
+
+Several flags may be specified on device link addition, two of which
+have already been mentioned above: ``DL_FLAG_STATELESS`` to express that no
+driver presence dependency is needed (but only correct suspend/resume and
+shutdown ordering) and ``DL_FLAG_PM_RUNTIME`` to express that runtime PM
+integration is desired.
+
+Two other flags are specifically targeted at use cases where the device
+link is added from the consumer's ``->probe`` callback: ``DL_FLAG_RPM_ACTIVE``
+can be specified to runtime resume the supplier and prevent it from suspending
+before the consumer is runtime suspended. ``DL_FLAG_AUTOREMOVE_CONSUMER``
+causes the device link to be automatically purged when the consumer fails to
+probe or later unbinds.
+
+Similarly, when the device link is added from supplier's ``->probe`` callback,
+``DL_FLAG_AUTOREMOVE_SUPPLIER`` causes the device link to be automatically
+purged when the supplier fails to probe or later unbinds.
+
+If neither ``DL_FLAG_AUTOREMOVE_CONSUMER`` nor ``DL_FLAG_AUTOREMOVE_SUPPLIER``
+is set, ``DL_FLAG_AUTOPROBE_CONSUMER`` can be used to request the driver core
+to probe for a driver for the consumer driver on the link automatically after
+a driver has been bound to the supplier device.
+
+Note, however, that any combinations of ``DL_FLAG_AUTOREMOVE_CONSUMER``,
+``DL_FLAG_AUTOREMOVE_SUPPLIER`` or ``DL_FLAG_AUTOPROBE_CONSUMER`` with
+``DL_FLAG_STATELESS`` are invalid and cannot be used.
+
+Limitations
+===========
+
+Driver authors should be aware that a driver presence dependency for managed
+device links (i.e. when ``DL_FLAG_STATELESS`` is not specified on link addition)
+may cause probing of the consumer to be deferred indefinitely. This can become
+a problem if the consumer is required to probe before a certain initcall level
+is reached. Worse, if the supplier driver is blacklisted or missing, the
+consumer will never be probed.
+
+Moreover, managed device links cannot be deleted directly. They are deleted
+by the driver core when they are not necessary any more in accordance with the
+``DL_FLAG_AUTOREMOVE_CONSUMER`` and ``DL_FLAG_AUTOREMOVE_SUPPLIER`` flags.
+However, stateless device links (i.e. device links with ``DL_FLAG_STATELESS``
+set) are expected to be removed by whoever called :c:func:`device_link_add()`
+to add them with the help of either :c:func:`device_link_del()` or
+:c:func:`device_link_remove()`.
+
+Passing ``DL_FLAG_RPM_ACTIVE`` along with ``DL_FLAG_STATELESS`` to
+:c:func:`device_link_add()` may cause the PM-runtime usage counter of the
+supplier device to remain nonzero after a subsequent invocation of either
+:c:func:`device_link_del()` or :c:func:`device_link_remove()` to remove the
+device link returned by it. This happens if :c:func:`device_link_add()` is
+called twice in a row for the same consumer-supplier pair without removing the
+link between these calls, in which case allowing the PM-runtime usage counter
+of the supplier to drop on an attempt to remove the link may cause it to be
+suspended while the consumer is still PM-runtime-active and that has to be
+avoided. [To work around this limitation it is sufficient to let the consumer
+runtime suspend at least once, or call :c:func:`pm_runtime_set_suspended()` for
+it with PM-runtime disabled, between the :c:func:`device_link_add()` and
+:c:func:`device_link_del()` or :c:func:`device_link_remove()` calls.]
+
+Sometimes drivers depend on optional resources. They are able to operate
+in a degraded mode (reduced feature set or performance) when those resources
+are not present. An example is an SPI controller that can use a DMA engine
+or work in PIO mode. The controller can determine presence of the optional
+resources at probe time but on non-presence there is no way to know whether
+they will become available in the near future (due to a supplier driver
+probing) or never. Consequently it cannot be determined whether to defer
+probing or not. It would be possible to notify drivers when optional
+resources become available after probing, but it would come at a high cost
+for drivers as switching between modes of operation at runtime based on the
+availability of such resources would be much more complex than a mechanism
+based on probe deferral. In any case optional resources are beyond the
+scope of device links.
+
+Examples
+========
+
+* An MMU device exists alongside a busmaster device, both are in the same
+ power domain. The MMU implements DMA address translation for the busmaster
+ device and shall be runtime resumed and kept active whenever and as long
+ as the busmaster device is active. The busmaster device's driver shall
+ not bind before the MMU is bound. To achieve this, a device link with
+ runtime PM integration is added from the busmaster device (consumer)
+ to the MMU device (supplier). The effect with regards to runtime PM
+ is the same as if the MMU was the parent of the master device.
+
+ The fact that both devices share the same power domain would normally
+ suggest usage of a struct dev_pm_domain or struct generic_pm_domain,
+ however these are not independent devices that happen to share a power
+ switch, but rather the MMU device serves the busmaster device and is
+ useless without it. A device link creates a synthetic hierarchical
+ relationship between the devices and is thus more apt.
+
+* A Thunderbolt host controller comprises a number of PCIe hotplug ports
+ and an NHI device to manage the PCIe switch. On resume from system sleep,
+ the NHI device needs to re-establish PCI tunnels to attached devices
+ before the hotplug ports can resume. If the hotplug ports were children
+ of the NHI, this resume order would automatically be enforced by the
+ PM core, but unfortunately they're aunts. The solution is to add
+ device links from the hotplug ports (consumers) to the NHI device
+ (supplier). A driver presence dependency is not necessary for this
+ use case.
+
+* Discrete GPUs in hybrid graphics laptops often feature an HDA controller
+ for HDMI/DP audio. In the device hierarchy the HDA controller is a sibling
+ of the VGA device, yet both share the same power domain and the HDA
+ controller is only ever needed when an HDMI/DP display is attached to the
+ VGA device. A device link from the HDA controller (consumer) to the
+ VGA device (supplier) aptly represents this relationship.
+
+* ACPI allows definition of a device start order by way of _DEP objects.
+ A classical example is when ACPI power management methods on one device
+ are implemented in terms of I\ :sup:`2`\ C accesses and require a specific
+ I\ :sup:`2`\ C controller to be present and functional for the power
+ management of the device in question to work.
+
+* In some SoCs a functional dependency exists from display, video codec and
+ video processing IP cores on transparent memory access IP cores that handle
+ burst access and compression/decompression.
+
+Alternatives
+============
+
+* A struct dev_pm_domain can be used to override the bus,
+ class or device type callbacks. It is intended for devices sharing
+ a single on/off switch, however it does not guarantee a specific
+ suspend/resume ordering, this needs to be implemented separately.
+ It also does not by itself track the runtime PM status of the involved
+ devices and turn off the power switch only when all of them are runtime
+ suspended. Furthermore it cannot be used to enforce a specific shutdown
+ ordering or a driver presence dependency.
+
+* A struct generic_pm_domain is a lot more heavyweight than a
+ device link and does not allow for shutdown ordering or driver presence
+ dependencies. It also cannot be used on ACPI systems.
+
+Implementation
+==============
+
+The device hierarchy, which -- as the name implies -- is a tree,
+becomes a directed acyclic graph once device links are added.
+
+Ordering of these devices during suspend/resume is determined by the
+dpm_list. During shutdown it is determined by the devices_kset. With
+no device links present, the two lists are a flattened, one-dimensional
+representations of the device tree such that a device is placed behind
+all its ancestors. That is achieved by traversing the ACPI namespace
+or OpenFirmware device tree top-down and appending devices to the lists
+as they are discovered.
+
+Once device links are added, the lists need to satisfy the additional
+constraint that a device is placed behind all its suppliers, recursively.
+To ensure this, upon addition of the device link the consumer and the
+entire sub-graph below it (all children and consumers of the consumer)
+are moved to the end of the list. (Call to :c:func:`device_reorder_to_tail()`
+from :c:func:`device_link_add()`.)
+
+To prevent introduction of dependency loops into the graph, it is
+verified upon device link addition that the supplier is not dependent
+on the consumer or any children or consumers of the consumer.
+(Call to :c:func:`device_is_dependent()` from :c:func:`device_link_add()`.)
+If that constraint is violated, :c:func:`device_link_add()` will return
+``NULL`` and a ``WARNING`` will be logged.
+
+Notably this also prevents the addition of a device link from a parent
+device to a child. However the converse is allowed, i.e. a device link
+from a child to a parent. Since the driver core already guarantees
+correct suspend/resume and shutdown ordering between parent and child,
+such a device link only makes sense if a driver presence dependency is
+needed on top of that. In this case driver authors should weigh
+carefully if a device link is at all the right tool for the purpose.
+A more suitable approach might be to simply use deferred probing or
+add a device flag causing the parent driver to be probed before the
+child one.
+
+State machine
+=============
+
+.. kernel-doc:: include/linux/device.h
+ :functions: device_link_state
+
+::
+
+ .=============================.
+ | |
+ v |
+ DORMANT <=> AVAILABLE <=> CONSUMER_PROBE => ACTIVE
+ ^ |
+ | |
+ '============ SUPPLIER_UNBIND <============'
+
+* The initial state of a device link is automatically determined by
+ :c:func:`device_link_add()` based on the driver presence on the supplier
+ and consumer. If the link is created before any devices are probed, it
+ is set to ``DL_STATE_DORMANT``.
+
+* When a supplier device is bound to a driver, links to its consumers
+ progress to ``DL_STATE_AVAILABLE``.
+ (Call to :c:func:`device_links_driver_bound()` from
+ :c:func:`driver_bound()`.)
+
+* Before a consumer device is probed, presence of supplier drivers is
+ verified by checking the consumer device is not in the wait_for_suppliers
+ list and by checking that links to suppliers are in ``DL_STATE_AVAILABLE``
+ state. The state of the links is updated to ``DL_STATE_CONSUMER_PROBE``.
+ (Call to :c:func:`device_links_check_suppliers()` from
+ :c:func:`really_probe()`.)
+ This prevents the supplier from unbinding.
+ (Call to :c:func:`wait_for_device_probe()` from
+ :c:func:`device_links_unbind_consumers()`.)
+
+* If the probe fails, links to suppliers revert back to ``DL_STATE_AVAILABLE``.
+ (Call to :c:func:`device_links_no_driver()` from :c:func:`really_probe()`.)
+
+* If the probe succeeds, links to suppliers progress to ``DL_STATE_ACTIVE``.
+ (Call to :c:func:`device_links_driver_bound()` from :c:func:`driver_bound()`.)
+
+* When the consumer's driver is later on removed, links to suppliers revert
+ back to ``DL_STATE_AVAILABLE``.
+ (Call to :c:func:`__device_links_no_driver()` from
+ :c:func:`device_links_driver_cleanup()`, which in turn is called from
+ :c:func:`__device_release_driver()`.)
+
+* Before a supplier's driver is removed, links to consumers that are not
+ bound to a driver are updated to ``DL_STATE_SUPPLIER_UNBIND``.
+ (Call to :c:func:`device_links_busy()` from
+ :c:func:`__device_release_driver()`.)
+ This prevents the consumers from binding.
+ (Call to :c:func:`device_links_check_suppliers()` from
+ :c:func:`really_probe()`.)
+ Consumers that are bound are freed from their driver; consumers that are
+ probing are waited for until they are done.
+ (Call to :c:func:`device_links_unbind_consumers()` from
+ :c:func:`__device_release_driver()`.)
+ Once all links to consumers are in ``DL_STATE_SUPPLIER_UNBIND`` state,
+ the supplier driver is released and the links revert to ``DL_STATE_DORMANT``.
+ (Call to :c:func:`device_links_driver_cleanup()` from
+ :c:func:`__device_release_driver()`.)
+
+API
+===
+
+See device_link_add(), device_link_del() and device_link_remove().
diff --git a/Documentation/driver-api/dma-buf.rst b/Documentation/driver-api/dma-buf.rst
new file mode 100644
index 0000000000..f92a32d095
--- /dev/null
+++ b/Documentation/driver-api/dma-buf.rst
@@ -0,0 +1,366 @@
+Buffer Sharing and Synchronization (dma-buf)
+============================================
+
+The dma-buf subsystem provides the framework for sharing buffers for
+hardware (DMA) access across multiple device drivers and subsystems, and
+for synchronizing asynchronous hardware access.
+
+This is used, for example, by drm "prime" multi-GPU support, but is of
+course not limited to GPU use cases.
+
+The three main components of this are: (1) dma-buf, representing a
+sg_table and exposed to userspace as a file descriptor to allow passing
+between devices, (2) fence, which provides a mechanism to signal when
+one device has finished access, and (3) reservation, which manages the
+shared or exclusive fence(s) associated with the buffer.
+
+Shared DMA Buffers
+------------------
+
+This document serves as a guide to device-driver writers on what is the dma-buf
+buffer sharing API, how to use it for exporting and using shared buffers.
+
+Any device driver which wishes to be a part of DMA buffer sharing, can do so as
+either the 'exporter' of buffers, or the 'user' or 'importer' of buffers.
+
+Say a driver A wants to use buffers created by driver B, then we call B as the
+exporter, and A as buffer-user/importer.
+
+The exporter
+
+ - implements and manages operations in :c:type:`struct dma_buf_ops
+ <dma_buf_ops>` for the buffer,
+ - allows other users to share the buffer by using dma_buf sharing APIs,
+ - manages the details of buffer allocation, wrapped in a :c:type:`struct
+ dma_buf <dma_buf>`,
+ - decides about the actual backing storage where this allocation happens,
+ - and takes care of any migration of scatterlist - for all (shared) users of
+ this buffer.
+
+The buffer-user
+
+ - is one of (many) sharing users of the buffer.
+ - doesn't need to worry about how the buffer is allocated, or where.
+ - and needs a mechanism to get access to the scatterlist that makes up this
+ buffer in memory, mapped into its own address space, so it can access the
+ same area of memory. This interface is provided by :c:type:`struct
+ dma_buf_attachment <dma_buf_attachment>`.
+
+Any exporters or users of the dma-buf buffer sharing framework must have a
+'select DMA_SHARED_BUFFER' in their respective Kconfigs.
+
+Userspace Interface Notes
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Mostly a DMA buffer file descriptor is simply an opaque object for userspace,
+and hence the generic interface exposed is very minimal. There's a few things to
+consider though:
+
+- Since kernel 3.12 the dma-buf FD supports the llseek system call, but only
+ with offset=0 and whence=SEEK_END|SEEK_SET. SEEK_SET is supported to allow
+ the usual size discover pattern size = SEEK_END(0); SEEK_SET(0). Every other
+ llseek operation will report -EINVAL.
+
+ If llseek on dma-buf FDs isn't support the kernel will report -ESPIPE for all
+ cases. Userspace can use this to detect support for discovering the dma-buf
+ size using llseek.
+
+- In order to avoid fd leaks on exec, the FD_CLOEXEC flag must be set
+ on the file descriptor. This is not just a resource leak, but a
+ potential security hole. It could give the newly exec'd application
+ access to buffers, via the leaked fd, to which it should otherwise
+ not be permitted access.
+
+ The problem with doing this via a separate fcntl() call, versus doing it
+ atomically when the fd is created, is that this is inherently racy in a
+ multi-threaded app[3]. The issue is made worse when it is library code
+ opening/creating the file descriptor, as the application may not even be
+ aware of the fd's.
+
+ To avoid this problem, userspace must have a way to request O_CLOEXEC
+ flag be set when the dma-buf fd is created. So any API provided by
+ the exporting driver to create a dmabuf fd must provide a way to let
+ userspace control setting of O_CLOEXEC flag passed in to dma_buf_fd().
+
+- Memory mapping the contents of the DMA buffer is also supported. See the
+ discussion below on `CPU Access to DMA Buffer Objects`_ for the full details.
+
+- The DMA buffer FD is also pollable, see `Implicit Fence Poll Support`_ below for
+ details.
+
+- The DMA buffer FD also supports a few dma-buf-specific ioctls, see
+ `DMA Buffer ioctls`_ below for details.
+
+Basic Operation and Device DMA Access
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-buf.c
+ :doc: dma buf device access
+
+CPU Access to DMA Buffer Objects
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-buf.c
+ :doc: cpu access
+
+Implicit Fence Poll Support
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-buf.c
+ :doc: implicit fence polling
+
+DMA-BUF statistics
+~~~~~~~~~~~~~~~~~~
+.. kernel-doc:: drivers/dma-buf/dma-buf-sysfs-stats.c
+ :doc: overview
+
+DMA Buffer ioctls
+~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/uapi/linux/dma-buf.h
+
+DMA-BUF locking convention
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-buf.c
+ :doc: locking convention
+
+Kernel Functions and Structures Reference
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-buf.c
+ :export:
+
+.. kernel-doc:: include/linux/dma-buf.h
+ :internal:
+
+Reservation Objects
+-------------------
+
+.. kernel-doc:: drivers/dma-buf/dma-resv.c
+ :doc: Reservation Object Overview
+
+.. kernel-doc:: drivers/dma-buf/dma-resv.c
+ :export:
+
+.. kernel-doc:: include/linux/dma-resv.h
+ :internal:
+
+DMA Fences
+----------
+
+.. kernel-doc:: drivers/dma-buf/dma-fence.c
+ :doc: DMA fences overview
+
+DMA Fence Cross-Driver Contract
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-fence.c
+ :doc: fence cross-driver contract
+
+DMA Fence Signalling Annotations
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-fence.c
+ :doc: fence signalling annotation
+
+DMA Fence Deadline Hints
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-fence.c
+ :doc: deadline hints
+
+DMA Fences Functions Reference
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-fence.c
+ :export:
+
+.. kernel-doc:: include/linux/dma-fence.h
+ :internal:
+
+DMA Fence Array
+~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-fence-array.c
+ :export:
+
+.. kernel-doc:: include/linux/dma-fence-array.h
+ :internal:
+
+DMA Fence Chain
+~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/dma-fence-chain.c
+ :export:
+
+.. kernel-doc:: include/linux/dma-fence-chain.h
+ :internal:
+
+DMA Fence unwrap
+~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/linux/dma-fence-unwrap.h
+ :internal:
+
+DMA Fence Sync File
+~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/dma-buf/sync_file.c
+ :export:
+
+.. kernel-doc:: include/linux/sync_file.h
+ :internal:
+
+DMA Fence Sync File uABI
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/uapi/linux/sync_file.h
+ :internal:
+
+Indefinite DMA Fences
+~~~~~~~~~~~~~~~~~~~~~
+
+At various times struct dma_fence with an indefinite time until dma_fence_wait()
+finishes have been proposed. Examples include:
+
+* Future fences, used in HWC1 to signal when a buffer isn't used by the display
+ any longer, and created with the screen update that makes the buffer visible.
+ The time this fence completes is entirely under userspace's control.
+
+* Proxy fences, proposed to handle &drm_syncobj for which the fence has not yet
+ been set. Used to asynchronously delay command submission.
+
+* Userspace fences or gpu futexes, fine-grained locking within a command buffer
+ that userspace uses for synchronization across engines or with the CPU, which
+ are then imported as a DMA fence for integration into existing winsys
+ protocols.
+
+* Long-running compute command buffers, while still using traditional end of
+ batch DMA fences for memory management instead of context preemption DMA
+ fences which get reattached when the compute job is rescheduled.
+
+Common to all these schemes is that userspace controls the dependencies of these
+fences and controls when they fire. Mixing indefinite fences with normal
+in-kernel DMA fences does not work, even when a fallback timeout is included to
+protect against malicious userspace:
+
+* Only the kernel knows about all DMA fence dependencies, userspace is not aware
+ of dependencies injected due to memory management or scheduler decisions.
+
+* Only userspace knows about all dependencies in indefinite fences and when
+ exactly they will complete, the kernel has no visibility.
+
+Furthermore the kernel has to be able to hold up userspace command submission
+for memory management needs, which means we must support indefinite fences being
+dependent upon DMA fences. If the kernel also support indefinite fences in the
+kernel like a DMA fence, like any of the above proposal would, there is the
+potential for deadlocks.
+
+.. kernel-render:: DOT
+ :alt: Indefinite Fencing Dependency Cycle
+ :caption: Indefinite Fencing Dependency Cycle
+
+ digraph "Fencing Cycle" {
+ node [shape=box bgcolor=grey style=filled]
+ kernel [label="Kernel DMA Fences"]
+ userspace [label="userspace controlled fences"]
+ kernel -> userspace [label="memory management"]
+ userspace -> kernel [label="Future fence, fence proxy, ..."]
+
+ { rank=same; kernel userspace }
+ }
+
+This means that the kernel might accidentally create deadlocks
+through memory management dependencies which userspace is unaware of, which
+randomly hangs workloads until the timeout kicks in. Workloads, which from
+userspace's perspective, do not contain a deadlock. In such a mixed fencing
+architecture there is no single entity with knowledge of all dependencies.
+Therefore preventing such deadlocks from within the kernel is not possible.
+
+The only solution to avoid dependencies loops is by not allowing indefinite
+fences in the kernel. This means:
+
+* No future fences, proxy fences or userspace fences imported as DMA fences,
+ with or without a timeout.
+
+* No DMA fences that signal end of batchbuffer for command submission where
+ userspace is allowed to use userspace fencing or long running compute
+ workloads. This also means no implicit fencing for shared buffers in these
+ cases.
+
+Recoverable Hardware Page Faults Implications
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Modern hardware supports recoverable page faults, which has a lot of
+implications for DMA fences.
+
+First, a pending page fault obviously holds up the work that's running on the
+accelerator and a memory allocation is usually required to resolve the fault.
+But memory allocations are not allowed to gate completion of DMA fences, which
+means any workload using recoverable page faults cannot use DMA fences for
+synchronization. Synchronization fences controlled by userspace must be used
+instead.
+
+On GPUs this poses a problem, because current desktop compositor protocols on
+Linux rely on DMA fences, which means without an entirely new userspace stack
+built on top of userspace fences, they cannot benefit from recoverable page
+faults. Specifically this means implicit synchronization will not be possible.
+The exception is when page faults are only used as migration hints and never to
+on-demand fill a memory request. For now this means recoverable page
+faults on GPUs are limited to pure compute workloads.
+
+Furthermore GPUs usually have shared resources between the 3D rendering and
+compute side, like compute units or command submission engines. If both a 3D
+job with a DMA fence and a compute workload using recoverable page faults are
+pending they could deadlock:
+
+- The 3D workload might need to wait for the compute job to finish and release
+ hardware resources first.
+
+- The compute workload might be stuck in a page fault, because the memory
+ allocation is waiting for the DMA fence of the 3D workload to complete.
+
+There are a few options to prevent this problem, one of which drivers need to
+ensure:
+
+- Compute workloads can always be preempted, even when a page fault is pending
+ and not yet repaired. Not all hardware supports this.
+
+- DMA fence workloads and workloads which need page fault handling have
+ independent hardware resources to guarantee forward progress. This could be
+ achieved through e.g. through dedicated engines and minimal compute unit
+ reservations for DMA fence workloads.
+
+- The reservation approach could be further refined by only reserving the
+ hardware resources for DMA fence workloads when they are in-flight. This must
+ cover the time from when the DMA fence is visible to other threads up to
+ moment when fence is completed through dma_fence_signal().
+
+- As a last resort, if the hardware provides no useful reservation mechanics,
+ all workloads must be flushed from the GPU when switching between jobs
+ requiring DMA fences or jobs requiring page fault handling: This means all DMA
+ fences must complete before a compute job with page fault handling can be
+ inserted into the scheduler queue. And vice versa, before a DMA fence can be
+ made visible anywhere in the system, all compute workloads must be preempted
+ to guarantee all pending GPU page faults are flushed.
+
+- Only a fairly theoretical option would be to untangle these dependencies when
+ allocating memory to repair hardware page faults, either through separate
+ memory blocks or runtime tracking of the full dependency graph of all DMA
+ fences. This results very wide impact on the kernel, since resolving the page
+ on the CPU side can itself involve a page fault. It is much more feasible and
+ robust to limit the impact of handling hardware page faults to the specific
+ driver.
+
+Note that workloads that run on independent hardware like copy engines or other
+GPUs do not have any impact. This allows us to keep using DMA fences internally
+in the kernel even for resolving hardware page faults, e.g. by using copy
+engines to clear or copy memory needed to resolve the page fault.
+
+In some ways this page fault problem is a special case of the `Infinite DMA
+Fences` discussions: Infinite fences from compute workloads are allowed to
+depend on DMA fences, but not the other way around. And not even the page fault
+problem is new, because some other CPU thread in userspace might
+hit a page fault which holds up a userspace fence - supporting page faults on
+GPUs doesn't anything fundamentally new.
diff --git a/Documentation/driver-api/dmaengine/client.rst b/Documentation/driver-api/dmaengine/client.rst
new file mode 100644
index 0000000000..ecf139f73d
--- /dev/null
+++ b/Documentation/driver-api/dmaengine/client.rst
@@ -0,0 +1,379 @@
+====================
+DMA Engine API Guide
+====================
+
+Vinod Koul <vinod dot koul at intel.com>
+
+.. note:: For DMA Engine usage in async_tx please see:
+ ``Documentation/crypto/async-tx-api.rst``
+
+
+Below is a guide to device driver writers on how to use the Slave-DMA API of the
+DMA Engine. This is applicable only for slave DMA usage only.
+
+DMA usage
+=========
+
+The slave DMA usage consists of following steps:
+
+- Allocate a DMA slave channel
+
+- Set slave and controller specific parameters
+
+- Get a descriptor for transaction
+
+- Submit the transaction
+
+- Issue pending requests and wait for callback notification
+
+The details of these operations are:
+
+1. Allocate a DMA slave channel
+
+ Channel allocation is slightly different in the slave DMA context,
+ client drivers typically need a channel from a particular DMA
+ controller only and even in some cases a specific channel is desired.
+ To request a channel dma_request_chan() API is used.
+
+ Interface:
+
+ .. code-block:: c
+
+ struct dma_chan *dma_request_chan(struct device *dev, const char *name);
+
+ Which will find and return the ``name`` DMA channel associated with the 'dev'
+ device. The association is done via DT, ACPI or board file based
+ dma_slave_map matching table.
+
+ A channel allocated via this interface is exclusive to the caller,
+ until dma_release_channel() is called.
+
+2. Set slave and controller specific parameters
+
+ Next step is always to pass some specific information to the DMA
+ driver. Most of the generic information which a slave DMA can use
+ is in struct dma_slave_config. This allows the clients to specify
+ DMA direction, DMA addresses, bus widths, DMA burst lengths etc
+ for the peripheral.
+
+ If some DMA controllers have more parameters to be sent then they
+ should try to embed struct dma_slave_config in their controller
+ specific structure. That gives flexibility to client to pass more
+ parameters, if required.
+
+ Interface:
+
+ .. code-block:: c
+
+ int dmaengine_slave_config(struct dma_chan *chan,
+ struct dma_slave_config *config)
+
+ Please see the dma_slave_config structure definition in dmaengine.h
+ for a detailed explanation of the struct members. Please note
+ that the 'direction' member will be going away as it duplicates the
+ direction given in the prepare call.
+
+3. Get a descriptor for transaction
+
+ For slave usage the various modes of slave transfers supported by the
+ DMA-engine are:
+
+ - slave_sg: DMA a list of scatter gather buffers from/to a peripheral
+
+ - dma_cyclic: Perform a cyclic DMA operation from/to a peripheral till the
+ operation is explicitly stopped.
+
+ - interleaved_dma: This is common to Slave as well as M2M clients. For slave
+ address of devices' fifo could be already known to the driver.
+ Various types of operations could be expressed by setting
+ appropriate values to the 'dma_interleaved_template' members. Cyclic
+ interleaved DMA transfers are also possible if supported by the channel by
+ setting the DMA_PREP_REPEAT transfer flag.
+
+ A non-NULL return of this transfer API represents a "descriptor" for
+ the given transaction.
+
+ Interface:
+
+ .. code-block:: c
+
+ struct dma_async_tx_descriptor *dmaengine_prep_slave_sg(
+ struct dma_chan *chan, struct scatterlist *sgl,
+ unsigned int sg_len, enum dma_data_direction direction,
+ unsigned long flags);
+
+ struct dma_async_tx_descriptor *dmaengine_prep_dma_cyclic(
+ struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
+ size_t period_len, enum dma_data_direction direction);
+
+ struct dma_async_tx_descriptor *dmaengine_prep_interleaved_dma(
+ struct dma_chan *chan, struct dma_interleaved_template *xt,
+ unsigned long flags);
+
+ The peripheral driver is expected to have mapped the scatterlist for
+ the DMA operation prior to calling dmaengine_prep_slave_sg(), and must
+ keep the scatterlist mapped until the DMA operation has completed.
+ The scatterlist must be mapped using the DMA struct device.
+ If a mapping needs to be synchronized later, dma_sync_*_for_*() must be
+ called using the DMA struct device, too.
+ So, normal setup should look like this:
+
+ .. code-block:: c
+
+ struct device *dma_dev = dmaengine_get_dma_device(chan);
+
+ nr_sg = dma_map_sg(dma_dev, sgl, sg_len);
+ if (nr_sg == 0)
+ /* error */
+
+ desc = dmaengine_prep_slave_sg(chan, sgl, nr_sg, direction, flags);
+
+ Once a descriptor has been obtained, the callback information can be
+ added and the descriptor must then be submitted. Some DMA engine
+ drivers may hold a spinlock between a successful preparation and
+ submission so it is important that these two operations are closely
+ paired.
+
+ .. note::
+
+ Although the async_tx API specifies that completion callback
+ routines cannot submit any new operations, this is not the
+ case for slave/cyclic DMA.
+
+ For slave DMA, the subsequent transaction may not be available
+ for submission prior to callback function being invoked, so
+ slave DMA callbacks are permitted to prepare and submit a new
+ transaction.
+
+ For cyclic DMA, a callback function may wish to terminate the
+ DMA via dmaengine_terminate_async().
+
+ Therefore, it is important that DMA engine drivers drop any
+ locks before calling the callback function which may cause a
+ deadlock.
+
+ Note that callbacks will always be invoked from the DMA
+ engines tasklet, never from interrupt context.
+
+ **Optional: per descriptor metadata**
+
+ DMAengine provides two ways for metadata support.
+
+ DESC_METADATA_CLIENT
+
+ The metadata buffer is allocated/provided by the client driver and it is
+ attached to the descriptor.
+
+ .. code-block:: c
+
+ int dmaengine_desc_attach_metadata(struct dma_async_tx_descriptor *desc,
+ void *data, size_t len);
+
+ DESC_METADATA_ENGINE
+
+ The metadata buffer is allocated/managed by the DMA driver. The client
+ driver can ask for the pointer, maximum size and the currently used size of
+ the metadata and can directly update or read it.
+
+ Because the DMA driver manages the memory area containing the metadata,
+ clients must make sure that they do not try to access or get the pointer
+ after their transfer completion callback has run for the descriptor.
+ If no completion callback has been defined for the transfer, then the
+ metadata must not be accessed after issue_pending.
+ In other words: if the aim is to read back metadata after the transfer is
+ completed, then the client must use completion callback.
+
+ .. code-block:: c
+
+ void *dmaengine_desc_get_metadata_ptr(struct dma_async_tx_descriptor *desc,
+ size_t *payload_len, size_t *max_len);
+
+ int dmaengine_desc_set_metadata_len(struct dma_async_tx_descriptor *desc,
+ size_t payload_len);
+
+ Client drivers can query if a given mode is supported with:
+
+ .. code-block:: c
+
+ bool dmaengine_is_metadata_mode_supported(struct dma_chan *chan,
+ enum dma_desc_metadata_mode mode);
+
+ Depending on the used mode client drivers must follow different flow.
+
+ DESC_METADATA_CLIENT
+
+ - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM:
+
+ 1. prepare the descriptor (dmaengine_prep_*)
+ construct the metadata in the client's buffer
+ 2. use dmaengine_desc_attach_metadata() to attach the buffer to the
+ descriptor
+ 3. submit the transfer
+
+ - DMA_DEV_TO_MEM:
+
+ 1. prepare the descriptor (dmaengine_prep_*)
+ 2. use dmaengine_desc_attach_metadata() to attach the buffer to the
+ descriptor
+ 3. submit the transfer
+ 4. when the transfer is completed, the metadata should be available in the
+ attached buffer
+
+ DESC_METADATA_ENGINE
+
+ - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM:
+
+ 1. prepare the descriptor (dmaengine_prep_*)
+ 2. use dmaengine_desc_get_metadata_ptr() to get the pointer to the
+ engine's metadata area
+ 3. update the metadata at the pointer
+ 4. use dmaengine_desc_set_metadata_len() to tell the DMA engine the
+ amount of data the client has placed into the metadata buffer
+ 5. submit the transfer
+
+ - DMA_DEV_TO_MEM:
+
+ 1. prepare the descriptor (dmaengine_prep_*)
+ 2. submit the transfer
+ 3. on transfer completion, use dmaengine_desc_get_metadata_ptr() to get
+ the pointer to the engine's metadata area
+ 4. read out the metadata from the pointer
+
+ .. note::
+
+ When DESC_METADATA_ENGINE mode is used the metadata area for the descriptor
+ is no longer valid after the transfer has been completed (valid up to the
+ point when the completion callback returns if used).
+
+ Mixed use of DESC_METADATA_CLIENT / DESC_METADATA_ENGINE is not allowed,
+ client drivers must use either of the modes per descriptor.
+
+4. Submit the transaction
+
+ Once the descriptor has been prepared and the callback information
+ added, it must be placed on the DMA engine drivers pending queue.
+
+ Interface:
+
+ .. code-block:: c
+
+ dma_cookie_t dmaengine_submit(struct dma_async_tx_descriptor *desc)
+
+ This returns a cookie can be used to check the progress of DMA engine
+ activity via other DMA engine calls not covered in this document.
+
+ dmaengine_submit() will not start the DMA operation, it merely adds
+ it to the pending queue. For this, see step 5, dma_async_issue_pending.
+
+ .. note::
+
+ After calling ``dmaengine_submit()`` the submitted transfer descriptor
+ (``struct dma_async_tx_descriptor``) belongs to the DMA engine.
+ Consequently, the client must consider invalid the pointer to that
+ descriptor.
+
+5. Issue pending DMA requests and wait for callback notification
+
+ The transactions in the pending queue can be activated by calling the
+ issue_pending API. If channel is idle then the first transaction in
+ queue is started and subsequent ones queued up.
+
+ On completion of each DMA operation, the next in queue is started and
+ a tasklet triggered. The tasklet will then call the client driver
+ completion callback routine for notification, if set.
+
+ Interface:
+
+ .. code-block:: c
+
+ void dma_async_issue_pending(struct dma_chan *chan);
+
+Further APIs
+------------
+
+1. Terminate APIs
+
+ .. code-block:: c
+
+ int dmaengine_terminate_sync(struct dma_chan *chan)
+ int dmaengine_terminate_async(struct dma_chan *chan)
+ int dmaengine_terminate_all(struct dma_chan *chan) /* DEPRECATED */
+
+ This causes all activity for the DMA channel to be stopped, and may
+ discard data in the DMA FIFO which hasn't been fully transferred.
+ No callback functions will be called for any incomplete transfers.
+
+ Two variants of this function are available.
+
+ dmaengine_terminate_async() might not wait until the DMA has been fully
+ stopped or until any running complete callbacks have finished. But it is
+ possible to call dmaengine_terminate_async() from atomic context or from
+ within a complete callback. dmaengine_synchronize() must be called before it
+ is safe to free the memory accessed by the DMA transfer or free resources
+ accessed from within the complete callback.
+
+ dmaengine_terminate_sync() will wait for the transfer and any running
+ complete callbacks to finish before it returns. But the function must not be
+ called from atomic context or from within a complete callback.
+
+ dmaengine_terminate_all() is deprecated and should not be used in new code.
+
+2. Pause API
+
+ .. code-block:: c
+
+ int dmaengine_pause(struct dma_chan *chan)
+
+ This pauses activity on the DMA channel without data loss.
+
+3. Resume API
+
+ .. code-block:: c
+
+ int dmaengine_resume(struct dma_chan *chan)
+
+ Resume a previously paused DMA channel. It is invalid to resume a
+ channel which is not currently paused.
+
+4. Check Txn complete
+
+ .. code-block:: c
+
+ enum dma_status dma_async_is_tx_complete(struct dma_chan *chan,
+ dma_cookie_t cookie, dma_cookie_t *last, dma_cookie_t *used)
+
+ This can be used to check the status of the channel. Please see
+ the documentation in include/linux/dmaengine.h for a more complete
+ description of this API.
+
+ This can be used in conjunction with dma_async_is_complete() and
+ the cookie returned from dmaengine_submit() to check for
+ completion of a specific DMA transaction.
+
+ .. note::
+
+ Not all DMA engine drivers can return reliable information for
+ a running DMA channel. It is recommended that DMA engine users
+ pause or stop (via dmaengine_terminate_all()) the channel before
+ using this API.
+
+5. Synchronize termination API
+
+ .. code-block:: c
+
+ void dmaengine_synchronize(struct dma_chan *chan)
+
+ Synchronize the termination of the DMA channel to the current context.
+
+ This function should be used after dmaengine_terminate_async() to synchronize
+ the termination of the DMA channel to the current context. The function will
+ wait for the transfer and any running complete callbacks to finish before it
+ returns.
+
+ If dmaengine_terminate_async() is used to stop the DMA channel this function
+ must be called before it is safe to free memory accessed by previously
+ submitted descriptors or to free any resources accessed within the complete
+ callback of previously submitted descriptors.
+
+ The behavior of this function is undefined if dma_async_issue_pending() has
+ been called between dmaengine_terminate_async() and this function.
diff --git a/Documentation/driver-api/dmaengine/dmatest.rst b/Documentation/driver-api/dmaengine/dmatest.rst
new file mode 100644
index 0000000000..e2a63cefd7
--- /dev/null
+++ b/Documentation/driver-api/dmaengine/dmatest.rst
@@ -0,0 +1,232 @@
+==============
+DMA Test Guide
+==============
+
+Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+
+This small document introduces how to test DMA drivers using dmatest module.
+
+The dmatest module tests DMA memcpy, memset, XOR and RAID6 P+Q operations using
+various lengths and various offsets into the source and destination buffers. It
+will initialize both buffers with a repeatable pattern and verify that the DMA
+engine copies the requested region and nothing more. It will also verify that
+the bytes aren't swapped around, and that the source buffer isn't modified.
+
+The dmatest module can be configured to test a specific channel. It can also
+test multiple channels at the same time, and it can start multiple threads
+competing for the same channel.
+
+.. note::
+ The test suite works only on the channels that have at least one
+ capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET
+ (const-to-memory or memory-to-memory, when emulated), DMA_XOR, DMA_PQ.
+
+.. note::
+ In case of any related questions use the official mailing list
+ dmaengine@vger.kernel.org.
+
+Part 1 - How to build the test module
+=====================================
+
+The menuconfig contains an option that could be found by following path:
+
+ Device Drivers -> DMA Engine support -> DMA Test client
+
+In the configuration file the option called CONFIG_DMATEST. The dmatest could
+be built as module or inside kernel. Let's consider those cases.
+
+Part 2 - When dmatest is built as a module
+==========================================
+
+Example of usage::
+
+ % modprobe dmatest timeout=2000 iterations=1 channel=dma0chan0 run=1
+
+...or::
+
+ % modprobe dmatest
+ % echo 2000 > /sys/module/dmatest/parameters/timeout
+ % echo 1 > /sys/module/dmatest/parameters/iterations
+ % echo dma0chan0 > /sys/module/dmatest/parameters/channel
+ % echo 1 > /sys/module/dmatest/parameters/run
+
+...or on the kernel command line::
+
+ dmatest.timeout=2000 dmatest.iterations=1 dmatest.channel=dma0chan0 dmatest.run=1
+
+Example of multi-channel test usage (new in the 5.0 kernel)::
+
+ % modprobe dmatest
+ % echo 2000 > /sys/module/dmatest/parameters/timeout
+ % echo 1 > /sys/module/dmatest/parameters/iterations
+ % echo dma0chan0 > /sys/module/dmatest/parameters/channel
+ % echo dma0chan1 > /sys/module/dmatest/parameters/channel
+ % echo dma0chan2 > /sys/module/dmatest/parameters/channel
+ % echo 1 > /sys/module/dmatest/parameters/run
+
+.. note::
+ For all tests, starting in the 5.0 kernel, either single- or multi-channel,
+ the channel parameter(s) must be set after all other parameters. It is at
+ that time that the existing parameter values are acquired for use by the
+ thread(s). All other parameters are shared. Therefore, if changes are made
+ to any of the other parameters, and an additional channel specified, the
+ (shared) parameters used for all threads will use the new values.
+ After the channels are specified, each thread is set as pending. All threads
+ begin execution when the run parameter is set to 1.
+
+.. hint::
+ A list of available channels can be found by running the following command::
+
+ % ls -1 /sys/class/dma/
+
+Once started a message like " dmatest: Added 1 threads using dma0chan0" is
+emitted. A thread for that specific channel is created and is now pending, the
+pending thread is started once run is to 1.
+
+Note that running a new test will not stop any in progress test.
+
+The following command returns the state of the test. ::
+
+ % cat /sys/module/dmatest/parameters/run
+
+To wait for test completion userspace can poll 'run' until it is false, or use
+the wait parameter. Specifying 'wait=1' when loading the module causes module
+initialization to pause until a test run has completed, while reading
+/sys/module/dmatest/parameters/wait waits for any running test to complete
+before returning. For example, the following scripts wait for 42 tests
+to complete before exiting. Note that if 'iterations' is set to 'infinite' then
+waiting is disabled.
+
+Example::
+
+ % modprobe dmatest run=1 iterations=42 wait=1
+ % modprobe -r dmatest
+
+...or::
+
+ % modprobe dmatest run=1 iterations=42
+ % cat /sys/module/dmatest/parameters/wait
+ % modprobe -r dmatest
+
+Part 3 - When built-in in the kernel
+====================================
+
+The module parameters that is supplied to the kernel command line will be used
+for the first performed test. After user gets a control, the test could be
+re-run with the same or different parameters. For the details see the above
+section `Part 2 - When dmatest is built as a module`_.
+
+In both cases the module parameters are used as the actual values for the test
+case. You always could check them at run-time by running ::
+
+ % grep -H . /sys/module/dmatest/parameters/*
+
+Part 4 - Gathering the test results
+===================================
+
+Test results are printed to the kernel log buffer with the format::
+
+ "dmatest: result <channel>: <test id>: '<error msg>' with src_off=<val> dst_off=<val> len=<val> (<err code>)"
+
+Example of output::
+
+ % dmesg | tail -n 1
+ dmatest: result dma0chan0-copy0: #1: No errors with src_off=0x7bf dst_off=0x8ad len=0x3fea (0)
+
+The message format is unified across the different types of errors. A
+number in the parentheses represents additional information, e.g. error
+code, error counter, or status. A test thread also emits a summary line at
+completion listing the number of tests executed, number that failed, and a
+result code.
+
+Example::
+
+ % dmesg | tail -n 1
+ dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)
+
+The details of a data miscompare error are also emitted, but do not follow the
+above format.
+
+Part 5 - Handling channel allocation
+====================================
+
+Allocating Channels
+-------------------
+
+Channels do not need to be configured prior to starting a test run. Attempting
+to run the test without configuring the channels will result in testing any
+channels that are available.
+
+Example::
+
+ % echo 1 > /sys/module/dmatest/parameters/run
+ dmatest: No channels configured, continue with any
+
+Channels are registered using the "channel" parameter. Channels can be requested by their
+name, once requested, the channel is registered and a pending thread is added to the test list.
+
+Example::
+
+ % echo dma0chan2 > /sys/module/dmatest/parameters/channel
+ dmatest: Added 1 threads using dma0chan2
+
+More channels can be added by repeating the example above.
+Reading back the channel parameter will return the name of last channel that was added successfully.
+
+Example::
+
+ % echo dma0chan1 > /sys/module/dmatest/parameters/channel
+ dmatest: Added 1 threads using dma0chan1
+ % echo dma0chan2 > /sys/module/dmatest/parameters/channel
+ dmatest: Added 1 threads using dma0chan2
+ % cat /sys/module/dmatest/parameters/channel
+ dma0chan2
+
+Another method of requesting channels is to request a channel with an empty string, Doing so
+will request all channels available to be tested:
+
+Example::
+
+ % echo "" > /sys/module/dmatest/parameters/channel
+ dmatest: Added 1 threads using dma0chan0
+ dmatest: Added 1 threads using dma0chan3
+ dmatest: Added 1 threads using dma0chan4
+ dmatest: Added 1 threads using dma0chan5
+ dmatest: Added 1 threads using dma0chan6
+ dmatest: Added 1 threads using dma0chan7
+ dmatest: Added 1 threads using dma0chan8
+
+At any point during the test configuration, reading the "test_list" parameter will
+print the list of currently pending tests.
+
+Example::
+
+ % cat /sys/module/dmatest/parameters/test_list
+ dmatest: 1 threads using dma0chan0
+ dmatest: 1 threads using dma0chan3
+ dmatest: 1 threads using dma0chan4
+ dmatest: 1 threads using dma0chan5
+ dmatest: 1 threads using dma0chan6
+ dmatest: 1 threads using dma0chan7
+ dmatest: 1 threads using dma0chan8
+
+Note: Channels will have to be configured for each test run as channel configurations do not
+carry across to the next test run.
+
+Releasing Channels
+-------------------
+
+Channels can be freed by setting run to 0.
+
+Example::
+
+ % echo dma0chan1 > /sys/module/dmatest/parameters/channel
+ dmatest: Added 1 threads using dma0chan1
+ % cat /sys/class/dma/dma0chan1/in_use
+ 1
+ % echo 0 > /sys/module/dmatest/parameters/run
+ % cat /sys/class/dma/dma0chan1/in_use
+ 0
+
+Channels allocated by previous test runs are automatically freed when a new
+channel is requested after completing a successful test run.
diff --git a/Documentation/driver-api/dmaengine/index.rst b/Documentation/driver-api/dmaengine/index.rst
new file mode 100644
index 0000000000..bdc45d8b4c
--- /dev/null
+++ b/Documentation/driver-api/dmaengine/index.rst
@@ -0,0 +1,55 @@
+=======================
+DMAEngine documentation
+=======================
+
+DMAEngine documentation provides documents for various aspects of DMAEngine
+framework.
+
+DMAEngine development documentation
+-----------------------------------
+
+This book helps with DMAengine internal APIs and guide for DMAEngine device
+driver writers.
+
+.. toctree::
+ :maxdepth: 1
+
+ provider
+
+DMAEngine client documentation
+------------------------------
+
+This book is a guide to device driver writers on how to use the Slave-DMA
+API of the DMAEngine. This is applicable only for slave DMA usage only.
+
+.. toctree::
+ :maxdepth: 1
+
+ client
+
+DMA Test documentation
+----------------------
+
+This book introduces how to test DMA drivers using dmatest module.
+
+.. toctree::
+ :maxdepth: 1
+
+ dmatest
+
+PXA DMA documentation
+----------------------
+
+This book adds some notes about PXA DMA
+
+.. toctree::
+ :maxdepth: 1
+
+ pxa_dma
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/dmaengine/provider.rst b/Documentation/driver-api/dmaengine/provider.rst
new file mode 100644
index 0000000000..ceac2a300e
--- /dev/null
+++ b/Documentation/driver-api/dmaengine/provider.rst
@@ -0,0 +1,647 @@
+==================================
+DMAengine controller documentation
+==================================
+
+Hardware Introduction
+=====================
+
+Most of the Slave DMA controllers have the same general principles of
+operations.
+
+They have a given number of channels to use for the DMA transfers, and
+a given number of requests lines.
+
+Requests and channels are pretty much orthogonal. Channels can be used
+to serve several to any requests. To simplify, channels are the
+entities that will be doing the copy, and requests what endpoints are
+involved.
+
+The request lines actually correspond to physical lines going from the
+DMA-eligible devices to the controller itself. Whenever the device
+will want to start a transfer, it will assert a DMA request (DRQ) by
+asserting that request line.
+
+A very simple DMA controller would only take into account a single
+parameter: the transfer size. At each clock cycle, it would transfer a
+byte of data from one buffer to another, until the transfer size has
+been reached.
+
+That wouldn't work well in the real world, since slave devices might
+require a specific number of bits to be transferred in a single
+cycle. For example, we may want to transfer as much data as the
+physical bus allows to maximize performances when doing a simple
+memory copy operation, but our audio device could have a narrower FIFO
+that requires data to be written exactly 16 or 24 bits at a time. This
+is why most if not all of the DMA controllers can adjust this, using a
+parameter called the transfer width.
+
+Moreover, some DMA controllers, whenever the RAM is used as a source
+or destination, can group the reads or writes in memory into a buffer,
+so instead of having a lot of small memory accesses, which is not
+really efficient, you'll get several bigger transfers. This is done
+using a parameter called the burst size, that defines how many single
+reads/writes it's allowed to do without the controller splitting the
+transfer into smaller sub-transfers.
+
+Our theoretical DMA controller would then only be able to do transfers
+that involve a single contiguous block of data. However, some of the
+transfers we usually have are not, and want to copy data from
+non-contiguous buffers to a contiguous buffer, which is called
+scatter-gather.
+
+DMAEngine, at least for mem2dev transfers, require support for
+scatter-gather. So we're left with two cases here: either we have a
+quite simple DMA controller that doesn't support it, and we'll have to
+implement it in software, or we have a more advanced DMA controller,
+that implements in hardware scatter-gather.
+
+The latter are usually programmed using a collection of chunks to
+transfer, and whenever the transfer is started, the controller will go
+over that collection, doing whatever we programmed there.
+
+This collection is usually either a table or a linked list. You will
+then push either the address of the table and its number of elements,
+or the first item of the list to one channel of the DMA controller,
+and whenever a DRQ will be asserted, it will go through the collection
+to know where to fetch the data from.
+
+Either way, the format of this collection is completely dependent on
+your hardware. Each DMA controller will require a different structure,
+but all of them will require, for every chunk, at least the source and
+destination addresses, whether it should increment these addresses or
+not and the three parameters we saw earlier: the burst size, the
+transfer width and the transfer size.
+
+The one last thing is that usually, slave devices won't issue DRQ by
+default, and you have to enable this in your slave device driver first
+whenever you're willing to use DMA.
+
+These were just the general memory-to-memory (also called mem2mem) or
+memory-to-device (mem2dev) kind of transfers. Most devices often
+support other kind of transfers or memory operations that dmaengine
+support and will be detailed later in this document.
+
+DMA Support in Linux
+====================
+
+Historically, DMA controller drivers have been implemented using the
+async TX API, to offload operations such as memory copy, XOR,
+cryptography, etc., basically any memory to memory operation.
+
+Over time, the need for memory to device transfers arose, and
+dmaengine was extended. Nowadays, the async TX API is written as a
+layer on top of dmaengine, and acts as a client. Still, dmaengine
+accommodates that API in some cases, and made some design choices to
+ensure that it stayed compatible.
+
+For more information on the Async TX API, please look the relevant
+documentation file in Documentation/crypto/async-tx-api.rst.
+
+DMAEngine APIs
+==============
+
+``struct dma_device`` Initialization
+------------------------------------
+
+Just like any other kernel framework, the whole DMAEngine registration
+relies on the driver filling a structure and registering against the
+framework. In our case, that structure is dma_device.
+
+The first thing you need to do in your driver is to allocate this
+structure. Any of the usual memory allocators will do, but you'll also
+need to initialize a few fields in there:
+
+- ``channels``: should be initialized as a list using the
+ INIT_LIST_HEAD macro for example
+
+- ``src_addr_widths``:
+ should contain a bitmask of the supported source transfer width
+
+- ``dst_addr_widths``:
+ should contain a bitmask of the supported destination transfer width
+
+- ``directions``:
+ should contain a bitmask of the supported slave directions
+ (i.e. excluding mem2mem transfers)
+
+- ``residue_granularity``:
+ granularity of the transfer residue reported to dma_set_residue.
+ This can be either:
+
+ - Descriptor:
+ your device doesn't support any kind of residue
+ reporting. The framework will only know that a particular
+ transaction descriptor is done.
+
+ - Segment:
+ your device is able to report which chunks have been transferred
+
+ - Burst:
+ your device is able to report which burst have been transferred
+
+- ``dev``: should hold the pointer to the ``struct device`` associated
+ to your current driver instance.
+
+Supported transaction types
+---------------------------
+
+The next thing you need is to set which transaction types your device
+(and driver) supports.
+
+Our ``dma_device structure`` has a field called cap_mask that holds the
+various types of transaction supported, and you need to modify this
+mask using the dma_cap_set function, with various flags depending on
+transaction types you support as an argument.
+
+All those capabilities are defined in the ``dma_transaction_type enum``,
+in ``include/linux/dmaengine.h``
+
+Currently, the types available are:
+
+- DMA_MEMCPY
+
+ - The device is able to do memory to memory copies
+
+ - No matter what the overall size of the combined chunks for source and
+ destination is, only as many bytes as the smallest of the two will be
+ transmitted. That means the number and size of the scatter-gather buffers in
+ both lists need not be the same, and that the operation functionally is
+ equivalent to a ``strncpy`` where the ``count`` argument equals the smallest
+ total size of the two scatter-gather list buffers.
+
+ - It's usually used for copying pixel data between host memory and
+ memory-mapped GPU device memory, such as found on modern PCI video graphics
+ cards. The most immediate example is the OpenGL API function
+ ``glReadPielx()``, which might require a verbatim copy of a huge framebuffer
+ from local device memory onto host memory.
+
+- DMA_XOR
+
+ - The device is able to perform XOR operations on memory areas
+
+ - Used to accelerate XOR intensive tasks, such as RAID5
+
+- DMA_XOR_VAL
+
+ - The device is able to perform parity check using the XOR
+ algorithm against a memory buffer.
+
+- DMA_PQ
+
+ - The device is able to perform RAID6 P+Q computations, P being a
+ simple XOR, and Q being a Reed-Solomon algorithm.
+
+- DMA_PQ_VAL
+
+ - The device is able to perform parity check using RAID6 P+Q
+ algorithm against a memory buffer.
+
+- DMA_MEMSET
+
+ - The device is able to fill memory with the provided pattern
+
+ - The pattern is treated as a single byte signed value.
+
+- DMA_INTERRUPT
+
+ - The device is able to trigger a dummy transfer that will
+ generate periodic interrupts
+
+ - Used by the client drivers to register a callback that will be
+ called on a regular basis through the DMA controller interrupt
+
+- DMA_PRIVATE
+
+ - The devices only supports slave transfers, and as such isn't
+ available for async transfers.
+
+- DMA_ASYNC_TX
+
+ - Must not be set by the device, and will be set by the framework
+ if needed
+
+ - TODO: What is it about?
+
+- DMA_SLAVE
+
+ - The device can handle device to memory transfers, including
+ scatter-gather transfers.
+
+ - While in the mem2mem case we were having two distinct types to
+ deal with a single chunk to copy or a collection of them, here,
+ we just have a single transaction type that is supposed to
+ handle both.
+
+ - If you want to transfer a single contiguous memory buffer,
+ simply build a scatter list with only one item.
+
+- DMA_CYCLIC
+
+ - The device can handle cyclic transfers.
+
+ - A cyclic transfer is a transfer where the chunk collection will
+ loop over itself, with the last item pointing to the first.
+
+ - It's usually used for audio transfers, where you want to operate
+ on a single ring buffer that you will fill with your audio data.
+
+- DMA_INTERLEAVE
+
+ - The device supports interleaved transfer.
+
+ - These transfers can transfer data from a non-contiguous buffer
+ to a non-contiguous buffer, opposed to DMA_SLAVE that can
+ transfer data from a non-contiguous data set to a continuous
+ destination buffer.
+
+ - It's usually used for 2d content transfers, in which case you
+ want to transfer a portion of uncompressed data directly to the
+ display to print it
+
+- DMA_COMPLETION_NO_ORDER
+
+ - The device does not support in order completion.
+
+ - The driver should return DMA_OUT_OF_ORDER for device_tx_status if
+ the device is setting this capability.
+
+ - All cookie tracking and checking API should be treated as invalid if
+ the device exports this capability.
+
+ - At this point, this is incompatible with polling option for dmatest.
+
+ - If this cap is set, the user is recommended to provide an unique
+ identifier for each descriptor sent to the DMA device in order to
+ properly track the completion.
+
+- DMA_REPEAT
+
+ - The device supports repeated transfers. A repeated transfer, indicated by
+ the DMA_PREP_REPEAT transfer flag, is similar to a cyclic transfer in that
+ it gets automatically repeated when it ends, but can additionally be
+ replaced by the client.
+
+ - This feature is limited to interleaved transfers, this flag should thus not
+ be set if the DMA_INTERLEAVE flag isn't set. This limitation is based on
+ the current needs of DMA clients, support for additional transfer types
+ should be added in the future if and when the need arises.
+
+- DMA_LOAD_EOT
+
+ - The device supports replacing repeated transfers at end of transfer (EOT)
+ by queuing a new transfer with the DMA_PREP_LOAD_EOT flag set.
+
+ - Support for replacing a currently running transfer at another point (such
+ as end of burst instead of end of transfer) will be added in the future
+ based on DMA clients needs, if and when the need arises.
+
+These various types will also affect how the source and destination
+addresses change over time.
+
+Addresses pointing to RAM are typically incremented (or decremented)
+after each transfer. In case of a ring buffer, they may loop
+(DMA_CYCLIC). Addresses pointing to a device's register (e.g. a FIFO)
+are typically fixed.
+
+Per descriptor metadata support
+-------------------------------
+Some data movement architecture (DMA controller and peripherals) uses metadata
+associated with a transaction. The DMA controller role is to transfer the
+payload and the metadata alongside.
+The metadata itself is not used by the DMA engine itself, but it contains
+parameters, keys, vectors, etc for peripheral or from the peripheral.
+
+The DMAengine framework provides a generic ways to facilitate the metadata for
+descriptors. Depending on the architecture the DMA driver can implement either
+or both of the methods and it is up to the client driver to choose which one
+to use.
+
+- DESC_METADATA_CLIENT
+
+ The metadata buffer is allocated/provided by the client driver and it is
+ attached (via the dmaengine_desc_attach_metadata() helper to the descriptor.
+
+ From the DMA driver the following is expected for this mode:
+
+ - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM
+
+ The data from the provided metadata buffer should be prepared for the DMA
+ controller to be sent alongside of the payload data. Either by copying to a
+ hardware descriptor, or highly coupled packet.
+
+ - DMA_DEV_TO_MEM
+
+ On transfer completion the DMA driver must copy the metadata to the client
+ provided metadata buffer before notifying the client about the completion.
+ After the transfer completion, DMA drivers must not touch the metadata
+ buffer provided by the client.
+
+- DESC_METADATA_ENGINE
+
+ The metadata buffer is allocated/managed by the DMA driver. The client driver
+ can ask for the pointer, maximum size and the currently used size of the
+ metadata and can directly update or read it. dmaengine_desc_get_metadata_ptr()
+ and dmaengine_desc_set_metadata_len() is provided as helper functions.
+
+ From the DMA driver the following is expected for this mode:
+
+ - get_metadata_ptr()
+
+ Should return a pointer for the metadata buffer, the maximum size of the
+ metadata buffer and the currently used / valid (if any) bytes in the buffer.
+
+ - set_metadata_len()
+
+ It is called by the clients after it have placed the metadata to the buffer
+ to let the DMA driver know the number of valid bytes provided.
+
+ Note: since the client will ask for the metadata pointer in the completion
+ callback (in DMA_DEV_TO_MEM case) the DMA driver must ensure that the
+ descriptor is not freed up prior the callback is called.
+
+Device operations
+-----------------
+
+Our dma_device structure also requires a few function pointers in
+order to implement the actual logic, now that we described what
+operations we were able to perform.
+
+The functions that we have to fill in there, and hence have to
+implement, obviously depend on the transaction types you reported as
+supported.
+
+- ``device_alloc_chan_resources``
+
+- ``device_free_chan_resources``
+
+ - These functions will be called whenever a driver will call
+ ``dma_request_channel`` or ``dma_release_channel`` for the first/last
+ time on the channel associated to that driver.
+
+ - They are in charge of allocating/freeing all the needed
+ resources in order for that channel to be useful for your driver.
+
+ - These functions can sleep.
+
+- ``device_prep_dma_*``
+
+ - These functions are matching the capabilities you registered
+ previously.
+
+ - These functions all take the buffer or the scatterlist relevant
+ for the transfer being prepared, and should create a hardware
+ descriptor or a list of hardware descriptors from it
+
+ - These functions can be called from an interrupt context
+
+ - Any allocation you might do should be using the GFP_NOWAIT
+ flag, in order not to potentially sleep, but without depleting
+ the emergency pool either.
+
+ - Drivers should try to pre-allocate any memory they might need
+ during the transfer setup at probe time to avoid putting to
+ much pressure on the nowait allocator.
+
+ - It should return a unique instance of the
+ ``dma_async_tx_descriptor structure``, that further represents this
+ particular transfer.
+
+ - This structure can be initialized using the function
+ ``dma_async_tx_descriptor_init``.
+
+ - You'll also need to set two fields in this structure:
+
+ - flags:
+ TODO: Can it be modified by the driver itself, or
+ should it be always the flags passed in the arguments
+
+ - tx_submit: A pointer to a function you have to implement,
+ that is supposed to push the current transaction descriptor to a
+ pending queue, waiting for issue_pending to be called.
+
+ - In this structure the function pointer callback_result can be
+ initialized in order for the submitter to be notified that a
+ transaction has completed. In the earlier code the function pointer
+ callback has been used. However it does not provide any status to the
+ transaction and will be deprecated. The result structure defined as
+ ``dmaengine_result`` that is passed in to callback_result
+ has two fields:
+
+ - result: This provides the transfer result defined by
+ ``dmaengine_tx_result``. Either success or some error condition.
+
+ - residue: Provides the residue bytes of the transfer for those that
+ support residue.
+
+- ``device_issue_pending``
+
+ - Takes the first transaction descriptor in the pending queue,
+ and starts the transfer. Whenever that transfer is done, it
+ should move to the next transaction in the list.
+
+ - This function can be called in an interrupt context
+
+- ``device_tx_status``
+
+ - Should report the bytes left to go over on the given channel
+
+ - Should only care about the transaction descriptor passed as
+ argument, not the currently active one on a given channel
+
+ - The tx_state argument might be NULL
+
+ - Should use dma_set_residue to report it
+
+ - In the case of a cyclic transfer, it should only take into
+ account the total size of the cyclic buffer.
+
+ - Should return DMA_OUT_OF_ORDER if the device does not support in order
+ completion and is completing the operation out of order.
+
+ - This function can be called in an interrupt context.
+
+- device_config
+
+ - Reconfigures the channel with the configuration given as argument
+
+ - This command should NOT perform synchronously, or on any
+ currently queued transfers, but only on subsequent ones
+
+ - In this case, the function will receive a ``dma_slave_config``
+ structure pointer as an argument, that will detail which
+ configuration to use.
+
+ - Even though that structure contains a direction field, this
+ field is deprecated in favor of the direction argument given to
+ the prep_* functions
+
+ - This call is mandatory for slave operations only. This should NOT be
+ set or expected to be set for memcpy operations.
+ If a driver support both, it should use this call for slave
+ operations only and not for memcpy ones.
+
+- device_pause
+
+ - Pauses a transfer on the channel
+
+ - This command should operate synchronously on the channel,
+ pausing right away the work of the given channel
+
+- device_resume
+
+ - Resumes a transfer on the channel
+
+ - This command should operate synchronously on the channel,
+ resuming right away the work of the given channel
+
+- device_terminate_all
+
+ - Aborts all the pending and ongoing transfers on the channel
+
+ - For aborted transfers the complete callback should not be called
+
+ - Can be called from atomic context or from within a complete
+ callback of a descriptor. Must not sleep. Drivers must be able
+ to handle this correctly.
+
+ - Termination may be asynchronous. The driver does not have to
+ wait until the currently active transfer has completely stopped.
+ See device_synchronize.
+
+- device_synchronize
+
+ - Must synchronize the termination of a channel to the current
+ context.
+
+ - Must make sure that memory for previously submitted
+ descriptors is no longer accessed by the DMA controller.
+
+ - Must make sure that all complete callbacks for previously
+ submitted descriptors have finished running and none are
+ scheduled to run.
+
+ - May sleep.
+
+
+Misc notes
+==========
+
+(stuff that should be documented, but don't really know
+where to put them)
+
+``dma_run_dependencies``
+
+- Should be called at the end of an async TX transfer, and can be
+ ignored in the slave transfers case.
+
+- Makes sure that dependent operations are run before marking it
+ as complete.
+
+dma_cookie_t
+
+- it's a DMA transaction ID that will increment over time.
+
+- Not really relevant any more since the introduction of ``virt-dma``
+ that abstracts it away.
+
+DMA_CTRL_ACK
+
+- If clear, the descriptor cannot be reused by provider until the
+ client acknowledges receipt, i.e. has a chance to establish any
+ dependency chains
+
+- This can be acked by invoking async_tx_ack()
+
+- If set, does not mean descriptor can be reused
+
+DMA_CTRL_REUSE
+
+- If set, the descriptor can be reused after being completed. It should
+ not be freed by provider if this flag is set.
+
+- The descriptor should be prepared for reuse by invoking
+ ``dmaengine_desc_set_reuse()`` which will set DMA_CTRL_REUSE.
+
+- ``dmaengine_desc_set_reuse()`` will succeed only when channel support
+ reusable descriptor as exhibited by capabilities
+
+- As a consequence, if a device driver wants to skip the
+ ``dma_map_sg()`` and ``dma_unmap_sg()`` in between 2 transfers,
+ because the DMA'd data wasn't used, it can resubmit the transfer right after
+ its completion.
+
+- Descriptor can be freed in few ways
+
+ - Clearing DMA_CTRL_REUSE by invoking
+ ``dmaengine_desc_clear_reuse()`` and submitting for last txn
+
+ - Explicitly invoking ``dmaengine_desc_free()``, this can succeed only
+ when DMA_CTRL_REUSE is already set
+
+ - Terminating the channel
+
+- DMA_PREP_CMD
+
+ - If set, the client driver tells DMA controller that passed data in DMA
+ API is command data.
+
+ - Interpretation of command data is DMA controller specific. It can be
+ used for issuing commands to other peripherals/register reads/register
+ writes for which the descriptor should be in different format from
+ normal data descriptors.
+
+- DMA_PREP_REPEAT
+
+ - If set, the transfer will be automatically repeated when it ends until a
+ new transfer is queued on the same channel with the DMA_PREP_LOAD_EOT flag.
+ If the next transfer to be queued on the channel does not have the
+ DMA_PREP_LOAD_EOT flag set, the current transfer will be repeated until the
+ client terminates all transfers.
+
+ - This flag is only supported if the channel reports the DMA_REPEAT
+ capability.
+
+- DMA_PREP_LOAD_EOT
+
+ - If set, the transfer will replace the transfer currently being executed at
+ the end of the transfer.
+
+ - This is the default behaviour for non-repeated transfers, specifying
+ DMA_PREP_LOAD_EOT for non-repeated transfers will thus make no difference.
+
+ - When using repeated transfers, DMA clients will usually need to set the
+ DMA_PREP_LOAD_EOT flag on all transfers, otherwise the channel will keep
+ repeating the last repeated transfer and ignore the new transfers being
+ queued. Failure to set DMA_PREP_LOAD_EOT will appear as if the channel was
+ stuck on the previous transfer.
+
+ - This flag is only supported if the channel reports the DMA_LOAD_EOT
+ capability.
+
+General Design Notes
+====================
+
+Most of the DMAEngine drivers you'll see are based on a similar design
+that handles the end of transfer interrupts in the handler, but defer
+most work to a tasklet, including the start of a new transfer whenever
+the previous transfer ended.
+
+This is a rather inefficient design though, because the inter-transfer
+latency will be not only the interrupt latency, but also the
+scheduling latency of the tasklet, which will leave the channel idle
+in between, which will slow down the global transfer rate.
+
+You should avoid this kind of practice, and instead of electing a new
+transfer in your tasklet, move that part to the interrupt handler in
+order to have a shorter idle window (that we can't really avoid
+anyway).
+
+Glossary
+========
+
+- Burst: A number of consecutive read or write operations that
+ can be queued to buffers before being flushed to memory.
+
+- Chunk: A contiguous collection of bursts
+
+- Transfer: A collection of chunks (be it contiguous or not)
diff --git a/Documentation/driver-api/dmaengine/pxa_dma.rst b/Documentation/driver-api/dmaengine/pxa_dma.rst
new file mode 100644
index 0000000000..442ee691a1
--- /dev/null
+++ b/Documentation/driver-api/dmaengine/pxa_dma.rst
@@ -0,0 +1,190 @@
+==============================
+PXA/MMP - DMA Slave controller
+==============================
+
+Constraints
+===========
+
+a) Transfers hot queuing
+A driver submitting a transfer and issuing it should be granted the transfer
+is queued even on a running DMA channel.
+This implies that the queuing doesn't wait for the previous transfer end,
+and that the descriptor chaining is not only done in the irq/tasklet code
+triggered by the end of the transfer.
+A transfer which is submitted and issued on a phy doesn't wait for a phy to
+stop and restart, but is submitted on a "running channel". The other
+drivers, especially mmp_pdma waited for the phy to stop before relaunching
+a new transfer.
+
+b) All transfers having asked for confirmation should be signaled
+Any issued transfer with DMA_PREP_INTERRUPT should trigger a callback call.
+This implies that even if an irq/tasklet is triggered by end of tx1, but
+at the time of irq/dma tx2 is already finished, tx1->complete() and
+tx2->complete() should be called.
+
+c) Channel running state
+A driver should be able to query if a channel is running or not. For the
+multimedia case, such as video capture, if a transfer is submitted and then
+a check of the DMA channel reports a "stopped channel", the transfer should
+not be issued until the next "start of frame interrupt", hence the need to
+know if a channel is in running or stopped state.
+
+d) Bandwidth guarantee
+The PXA architecture has 4 levels of DMAs priorities : high, normal, low.
+The high priorities get twice as much bandwidth as the normal, which get twice
+as much as the low priorities.
+A driver should be able to request a priority, especially the real-time
+ones such as pxa_camera with (big) throughputs.
+
+Design
+======
+a) Virtual channels
+Same concept as in sa11x0 driver, ie. a driver was assigned a "virtual
+channel" linked to the requestor line, and the physical DMA channel is
+assigned on the fly when the transfer is issued.
+
+b) Transfer anatomy for a scatter-gather transfer
+
+::
+
+ +------------+-----+---------------+----------------+-----------------+
+ | desc-sg[0] | ... | desc-sg[last] | status updater | finisher/linker |
+ +------------+-----+---------------+----------------+-----------------+
+
+This structure is pointed by dma->sg_cpu.
+The descriptors are used as follows :
+
+ - desc-sg[i]: i-th descriptor, transferring the i-th sg
+ element to the video buffer scatter gather
+
+ - status updater
+ Transfers a single u32 to a well known dma coherent memory to leave
+ a trace that this transfer is done. The "well known" is unique per
+ physical channel, meaning that a read of this value will tell which
+ is the last finished transfer at that point in time.
+
+ - finisher: has ddadr=DADDR_STOP, dcmd=ENDIRQEN
+
+ - linker: has ddadr= desc-sg[0] of next transfer, dcmd=0
+
+c) Transfers hot-chaining
+Suppose the running chain is:
+
+::
+
+ Buffer 1 Buffer 2
+ +---------+----+---+ +----+----+----+---+
+ | d0 | .. | dN | l | | d0 | .. | dN | f |
+ +---------+----+-|-+ ^----+----+----+---+
+ | |
+ +----+
+
+After a call to dmaengine_submit(b3), the chain will look like:
+
+::
+
+ Buffer 1 Buffer 2 Buffer 3
+ +---------+----+---+ +----+----+----+---+ +----+----+----+---+
+ | d0 | .. | dN | l | | d0 | .. | dN | l | | d0 | .. | dN | f |
+ +---------+----+-|-+ ^----+----+----+-|-+ ^----+----+----+---+
+ | | | |
+ +----+ +----+
+ new_link
+
+If while new_link was created the DMA channel stopped, it is _not_
+restarted. Hot-chaining doesn't break the assumption that
+dma_async_issue_pending() is to be used to ensure the transfer is actually started.
+
+One exception to this rule :
+
+- if Buffer1 and Buffer2 had all their addresses 8 bytes aligned
+
+- and if Buffer3 has at least one address not 4 bytes aligned
+
+- then hot-chaining cannot happen, as the channel must be stopped, the
+ "align bit" must be set, and the channel restarted As a consequence,
+ such a transfer tx_submit() will be queued on the submitted queue, and
+ this specific case if the DMA is already running in aligned mode.
+
+d) Transfers completion updater
+Each time a transfer is completed on a channel, an interrupt might be
+generated or not, up to the client's request. But in each case, the last
+descriptor of a transfer, the "status updater", will write the latest
+transfer being completed into the physical channel's completion mark.
+
+This will speed up residue calculation, for large transfers such as video
+buffers which hold around 6k descriptors or more. This also allows without
+any lock to find out what is the latest completed transfer in a running
+DMA chain.
+
+e) Transfers completion, irq and tasklet
+When a transfer flagged as "DMA_PREP_INTERRUPT" is finished, the dma irq
+is raised. Upon this interrupt, a tasklet is scheduled for the physical
+channel.
+
+The tasklet is responsible for :
+
+- reading the physical channel last updater mark
+
+- calling all the transfer callbacks of finished transfers, based on
+ that mark, and each transfer flags.
+
+If a transfer is completed while this handling is done, a dma irq will
+be raised, and the tasklet will be scheduled once again, having a new
+updater mark.
+
+f) Residue
+Residue granularity will be descriptor based. The issued but not completed
+transfers will be scanned for all of their descriptors against the
+currently running descriptor.
+
+g) Most complicated case of driver's tx queues
+The most tricky situation is when :
+
+ - there are not "acked" transfers (tx0)
+
+ - a driver submitted an aligned tx1, not chained
+
+ - a driver submitted an aligned tx2 => tx2 is cold chained to tx1
+
+ - a driver issued tx1+tx2 => channel is running in aligned mode
+
+ - a driver submitted an aligned tx3 => tx3 is hot-chained
+
+ - a driver submitted an unaligned tx4 => tx4 is put in submitted queue,
+ not chained
+
+ - a driver issued tx4 => tx4 is put in issued queue, not chained
+
+ - a driver submitted an aligned tx5 => tx5 is put in submitted queue, not
+ chained
+
+ - a driver submitted an aligned tx6 => tx6 is put in submitted queue,
+ cold chained to tx5
+
+ This translates into (after tx4 is issued) :
+
+ - issued queue
+
+ ::
+
+ +-----+ +-----+ +-----+ +-----+
+ | tx1 | | tx2 | | tx3 | | tx4 |
+ +---|-+ ^---|-+ ^-----+ +-----+
+ | | | |
+ +---+ +---+
+ - submitted queue
+ +-----+ +-----+
+ | tx5 | | tx6 |
+ +---|-+ ^-----+
+ | |
+ +---+
+
+- completed queue : empty
+
+- allocated queue : tx0
+
+It should be noted that after tx3 is completed, the channel is stopped, and
+restarted in "unaligned mode" to handle tx4.
+
+Author: Robert Jarzmik <robert.jarzmik@free.fr>
diff --git a/Documentation/driver-api/driver-model/binding.rst b/Documentation/driver-api/driver-model/binding.rst
new file mode 100644
index 0000000000..7ea1d7a41e
--- /dev/null
+++ b/Documentation/driver-api/driver-model/binding.rst
@@ -0,0 +1,98 @@
+==============
+Driver Binding
+==============
+
+Driver binding is the process of associating a device with a device
+driver that can control it. Bus drivers have typically handled this
+because there have been bus-specific structures to represent the
+devices and the drivers. With generic device and device driver
+structures, most of the binding can take place using common code.
+
+
+Bus
+~~~
+
+The bus type structure contains a list of all devices that are on that bus
+type in the system. When device_register is called for a device, it is
+inserted into the end of this list. The bus object also contains a
+list of all drivers of that bus type. When driver_register is called
+for a driver, it is inserted at the end of this list. These are the
+two events which trigger driver binding.
+
+
+device_register
+~~~~~~~~~~~~~~~
+
+When a new device is added, the bus's list of drivers is iterated over
+to find one that supports it. In order to determine that, the device
+ID of the device must match one of the device IDs that the driver
+supports. The format and semantics for comparing IDs is bus-specific.
+Instead of trying to derive a complex state machine and matching
+algorithm, it is up to the bus driver to provide a callback to compare
+a device against the IDs of a driver. The bus returns 1 if a match was
+found; 0 otherwise.
+
+int match(struct device * dev, struct device_driver * drv);
+
+If a match is found, the device's driver field is set to the driver
+and the driver's probe callback is called. This gives the driver a
+chance to verify that it really does support the hardware, and that
+it's in a working state.
+
+Device Class
+~~~~~~~~~~~~
+
+Upon the successful completion of probe, the device is registered with
+the class to which it belongs. Device drivers belong to one and only one
+class, and that is set in the driver's devclass field.
+devclass_add_device is called to enumerate the device within the class
+and actually register it with the class, which happens with the
+class's register_dev callback.
+
+
+Driver
+~~~~~~
+
+When a driver is attached to a device, the device is inserted into the
+driver's list of devices.
+
+
+sysfs
+~~~~~
+
+A symlink is created in the bus's 'devices' directory that points to
+the device's directory in the physical hierarchy.
+
+A symlink is created in the driver's 'devices' directory that points
+to the device's directory in the physical hierarchy.
+
+A directory for the device is created in the class's directory. A
+symlink is created in that directory that points to the device's
+physical location in the sysfs tree.
+
+A symlink can be created (though this isn't done yet) in the device's
+physical directory to either its class directory, or the class's
+top-level directory. One can also be created to point to its driver's
+directory also.
+
+
+driver_register
+~~~~~~~~~~~~~~~
+
+The process is almost identical for when a new driver is added.
+The bus's list of devices is iterated over to find a match. Devices
+that already have a driver are skipped. All the devices are iterated
+over, to bind as many devices as possible to the driver.
+
+
+Removal
+~~~~~~~
+
+When a device is removed, the reference count for it will eventually
+go to 0. When it does, the remove callback of the driver is called. It
+is removed from the driver's list of devices and the reference count
+of the driver is decremented. All symlinks between the two are removed.
+
+When a driver is removed, the list of devices that it supports is
+iterated over, and the driver's remove callback is called for each
+one. The device is removed from that list and the symlinks removed.
diff --git a/Documentation/driver-api/driver-model/bus.rst b/Documentation/driver-api/driver-model/bus.rst
new file mode 100644
index 0000000000..9709ab62a4
--- /dev/null
+++ b/Documentation/driver-api/driver-model/bus.rst
@@ -0,0 +1,146 @@
+=========
+Bus Types
+=========
+
+Definition
+~~~~~~~~~~
+See the kerneldoc for the struct bus_type.
+
+int bus_register(struct bus_type * bus);
+
+
+Declaration
+~~~~~~~~~~~
+
+Each bus type in the kernel (PCI, USB, etc) should declare one static
+object of this type. They must initialize the name field, and may
+optionally initialize the match callback::
+
+ struct bus_type pci_bus_type = {
+ .name = "pci",
+ .match = pci_bus_match,
+ };
+
+The structure should be exported to drivers in a header file:
+
+extern struct bus_type pci_bus_type;
+
+
+Registration
+~~~~~~~~~~~~
+
+When a bus driver is initialized, it calls bus_register. This
+initializes the rest of the fields in the bus object and inserts it
+into a global list of bus types. Once the bus object is registered,
+the fields in it are usable by the bus driver.
+
+
+Callbacks
+~~~~~~~~~
+
+match(): Attaching Drivers to Devices
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The format of device ID structures and the semantics for comparing
+them are inherently bus-specific. Drivers typically declare an array
+of device IDs of devices they support that reside in a bus-specific
+driver structure.
+
+The purpose of the match callback is to give the bus an opportunity to
+determine if a particular driver supports a particular device by
+comparing the device IDs the driver supports with the device ID of a
+particular device, without sacrificing bus-specific functionality or
+type-safety.
+
+When a driver is registered with the bus, the bus's list of devices is
+iterated over, and the match callback is called for each device that
+does not have a driver associated with it.
+
+
+
+Device and Driver Lists
+~~~~~~~~~~~~~~~~~~~~~~~
+
+The lists of devices and drivers are intended to replace the local
+lists that many buses keep. They are lists of struct devices and
+struct device_drivers, respectively. Bus drivers are free to use the
+lists as they please, but conversion to the bus-specific type may be
+necessary.
+
+The LDM core provides helper functions for iterating over each list::
+
+ int bus_for_each_dev(struct bus_type * bus, struct device * start,
+ void * data,
+ int (*fn)(struct device *, void *));
+
+ int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
+ void * data, int (*fn)(struct device_driver *, void *));
+
+These helpers iterate over the respective list, and call the callback
+for each device or driver in the list. All list accesses are
+synchronized by taking the bus's lock (read currently). The reference
+count on each object in the list is incremented before the callback is
+called; it is decremented after the next object has been obtained. The
+lock is not held when calling the callback.
+
+
+sysfs
+~~~~~~~~
+There is a top-level directory named 'bus'.
+
+Each bus gets a directory in the bus directory, along with two default
+directories::
+
+ /sys/bus/pci/
+ |-- devices
+ `-- drivers
+
+Drivers registered with the bus get a directory in the bus's drivers
+directory::
+
+ /sys/bus/pci/
+ |-- devices
+ `-- drivers
+ |-- Intel ICH
+ |-- Intel ICH Joystick
+ |-- agpgart
+ `-- e100
+
+Each device that is discovered on a bus of that type gets a symlink in
+the bus's devices directory to the device's directory in the physical
+hierarchy::
+
+ /sys/bus/pci/
+ |-- devices
+ | |-- 00:00.0 -> ../../../root/pci0/00:00.0
+ | |-- 00:01.0 -> ../../../root/pci0/00:01.0
+ | `-- 00:02.0 -> ../../../root/pci0/00:02.0
+ `-- drivers
+
+
+Exporting Attributes
+~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ struct bus_attribute {
+ struct attribute attr;
+ ssize_t (*show)(const struct bus_type *, char * buf);
+ ssize_t (*store)(const struct bus_type *, const char * buf, size_t count);
+ };
+
+Bus drivers can export attributes using the BUS_ATTR_RW macro that works
+similarly to the DEVICE_ATTR_RW macro for devices. For example, a
+definition like this::
+
+ static BUS_ATTR_RW(debug);
+
+is equivalent to declaring::
+
+ static bus_attribute bus_attr_debug;
+
+This can then be used to add and remove the attribute from the bus's
+sysfs directory using::
+
+ int bus_create_file(struct bus_type *, struct bus_attribute *);
+ void bus_remove_file(struct bus_type *, struct bus_attribute *);
diff --git a/Documentation/driver-api/driver-model/design-patterns.rst b/Documentation/driver-api/driver-model/design-patterns.rst
new file mode 100644
index 0000000000..41eb8f41f7
--- /dev/null
+++ b/Documentation/driver-api/driver-model/design-patterns.rst
@@ -0,0 +1,116 @@
+=============================
+Device Driver Design Patterns
+=============================
+
+This document describes a few common design patterns found in device drivers.
+It is likely that subsystem maintainers will ask driver developers to
+conform to these design patterns.
+
+1. State Container
+2. container_of()
+
+
+1. State Container
+~~~~~~~~~~~~~~~~~~
+
+While the kernel contains a few device drivers that assume that they will
+only be probed() once on a certain system (singletons), it is custom to assume
+that the device the driver binds to will appear in several instances. This
+means that the probe() function and all callbacks need to be reentrant.
+
+The most common way to achieve this is to use the state container design
+pattern. It usually has this form::
+
+ struct foo {
+ spinlock_t lock; /* Example member */
+ (...)
+ };
+
+ static int foo_probe(...)
+ {
+ struct foo *foo;
+
+ foo = devm_kzalloc(dev, sizeof(*foo), GFP_KERNEL);
+ if (!foo)
+ return -ENOMEM;
+ spin_lock_init(&foo->lock);
+ (...)
+ }
+
+This will create an instance of struct foo in memory every time probe() is
+called. This is our state container for this instance of the device driver.
+Of course it is then necessary to always pass this instance of the
+state around to all functions that need access to the state and its members.
+
+For example, if the driver is registering an interrupt handler, you would
+pass around a pointer to struct foo like this::
+
+ static irqreturn_t foo_handler(int irq, void *arg)
+ {
+ struct foo *foo = arg;
+ (...)
+ }
+
+ static int foo_probe(...)
+ {
+ struct foo *foo;
+
+ (...)
+ ret = request_irq(irq, foo_handler, 0, "foo", foo);
+ }
+
+This way you always get a pointer back to the correct instance of foo in
+your interrupt handler.
+
+
+2. container_of()
+~~~~~~~~~~~~~~~~~
+
+Continuing on the above example we add an offloaded work::
+
+ struct foo {
+ spinlock_t lock;
+ struct workqueue_struct *wq;
+ struct work_struct offload;
+ (...)
+ };
+
+ static void foo_work(struct work_struct *work)
+ {
+ struct foo *foo = container_of(work, struct foo, offload);
+
+ (...)
+ }
+
+ static irqreturn_t foo_handler(int irq, void *arg)
+ {
+ struct foo *foo = arg;
+
+ queue_work(foo->wq, &foo->offload);
+ (...)
+ }
+
+ static int foo_probe(...)
+ {
+ struct foo *foo;
+
+ foo->wq = create_singlethread_workqueue("foo-wq");
+ INIT_WORK(&foo->offload, foo_work);
+ (...)
+ }
+
+The design pattern is the same for an hrtimer or something similar that will
+return a single argument which is a pointer to a struct member in the
+callback.
+
+container_of() is a macro defined in <linux/kernel.h>
+
+What container_of() does is to obtain a pointer to the containing struct from
+a pointer to a member by a simple subtraction using the offsetof() macro from
+standard C, which allows something similar to object oriented behaviours.
+Notice that the contained member must not be a pointer, but an actual member
+for this to work.
+
+We can see here that we avoid having global pointers to our struct foo *
+instance this way, while still keeping the number of parameters passed to the
+work function to a single pointer.
diff --git a/Documentation/driver-api/driver-model/device.rst b/Documentation/driver-api/driver-model/device.rst
new file mode 100644
index 0000000000..0833be568b
--- /dev/null
+++ b/Documentation/driver-api/driver-model/device.rst
@@ -0,0 +1,120 @@
+==========================
+The Basic Device Structure
+==========================
+
+See the kerneldoc for the struct device.
+
+
+Programming Interface
+~~~~~~~~~~~~~~~~~~~~~
+The bus driver that discovers the device uses this to register the
+device with the core::
+
+ int device_register(struct device * dev);
+
+The bus should initialize the following fields:
+
+ - parent
+ - name
+ - bus_id
+ - bus
+
+A device is removed from the core when its reference count goes to
+0. The reference count can be adjusted using::
+
+ struct device * get_device(struct device * dev);
+ void put_device(struct device * dev);
+
+get_device() will return a pointer to the struct device passed to it
+if the reference is not already 0 (if it's in the process of being
+removed already).
+
+A driver can access the lock in the device structure using::
+
+ void lock_device(struct device * dev);
+ void unlock_device(struct device * dev);
+
+
+Attributes
+~~~~~~~~~~
+
+::
+
+ struct device_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct device *dev, struct device_attribute *attr,
+ char *buf);
+ ssize_t (*store)(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count);
+ };
+
+Attributes of devices can be exported by a device driver through sysfs.
+
+Please see Documentation/filesystems/sysfs.rst for more information
+on how sysfs works.
+
+As explained in Documentation/core-api/kobject.rst, device attributes must be
+created before the KOBJ_ADD uevent is generated. The only way to realize
+that is by defining an attribute group.
+
+Attributes are declared using a macro called DEVICE_ATTR::
+
+ #define DEVICE_ATTR(name,mode,show,store)
+
+Example:::
+
+ static DEVICE_ATTR(type, 0444, type_show, NULL);
+ static DEVICE_ATTR(power, 0644, power_show, power_store);
+
+Helper macros are available for common values of mode, so the above examples
+can be simplified to:::
+
+ static DEVICE_ATTR_RO(type);
+ static DEVICE_ATTR_RW(power);
+
+This declares two structures of type struct device_attribute with respective
+names 'dev_attr_type' and 'dev_attr_power'. These two attributes can be
+organized as follows into a group::
+
+ static struct attribute *dev_attrs[] = {
+ &dev_attr_type.attr,
+ &dev_attr_power.attr,
+ NULL,
+ };
+
+ static struct attribute_group dev_group = {
+ .attrs = dev_attrs,
+ };
+
+ static const struct attribute_group *dev_groups[] = {
+ &dev_group,
+ NULL,
+ };
+
+A helper macro is available for the common case of a single group, so the
+above two structures can be declared using:::
+
+ ATTRIBUTE_GROUPS(dev);
+
+This array of groups can then be associated with a device by setting the
+group pointer in struct device before device_register() is invoked::
+
+ dev->groups = dev_groups;
+ device_register(dev);
+
+The device_register() function will use the 'groups' pointer to create the
+device attributes and the device_unregister() function will use this pointer
+to remove the device attributes.
+
+Word of warning: While the kernel allows device_create_file() and
+device_remove_file() to be called on a device at any time, userspace has
+strict expectations on when attributes get created. When a new device is
+registered in the kernel, a uevent is generated to notify userspace (like
+udev) that a new device is available. If attributes are added after the
+device is registered, then userspace won't get notified and userspace will
+not know about the new attributes.
+
+This is important for device driver that need to publish additional
+attributes for a device at driver probe time. If the device driver simply
+calls device_create_file() on the device structure passed to it, then
+userspace will never be notified of the new attributes.
diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
new file mode 100644
index 0000000000..8be086b3f8
--- /dev/null
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -0,0 +1,462 @@
+================================
+Devres - Managed Device Resource
+================================
+
+Tejun Heo <teheo@suse.de>
+
+First draft 10 January 2007
+
+.. contents
+
+ 1. Intro : Huh? Devres?
+ 2. Devres : Devres in a nutshell
+ 3. Devres Group : Group devres'es and release them together
+ 4. Details : Life time rules, calling context, ...
+ 5. Overhead : How much do we have to pay for this?
+ 6. List of managed interfaces: Currently implemented managed interfaces
+
+
+1. Intro
+--------
+
+devres came up while trying to convert libata to use iomap. Each
+iomapped address should be kept and unmapped on driver detach. For
+example, a plain SFF ATA controller (that is, good old PCI IDE) in
+native mode makes use of 5 PCI BARs and all of them should be
+maintained.
+
+As with many other device drivers, libata low level drivers have
+sufficient bugs in ->remove and ->probe failure path. Well, yes,
+that's probably because libata low level driver developers are lazy
+bunch, but aren't all low level driver developers? After spending a
+day fiddling with braindamaged hardware with no document or
+braindamaged document, if it's finally working, well, it's working.
+
+For one reason or another, low level drivers don't receive as much
+attention or testing as core code, and bugs on driver detach or
+initialization failure don't happen often enough to be noticeable.
+Init failure path is worse because it's much less travelled while
+needs to handle multiple entry points.
+
+So, many low level drivers end up leaking resources on driver detach
+and having half broken failure path implementation in ->probe() which
+would leak resources or even cause oops when failure occurs. iomap
+adds more to this mix. So do msi and msix.
+
+
+2. Devres
+---------
+
+devres is basically linked list of arbitrarily sized memory areas
+associated with a struct device. Each devres entry is associated with
+a release function. A devres can be released in several ways. No
+matter what, all devres entries are released on driver detach. On
+release, the associated release function is invoked and then the
+devres entry is freed.
+
+Managed interface is created for resources commonly used by device
+drivers using devres. For example, coherent DMA memory is acquired
+using dma_alloc_coherent(). The managed version is called
+dmam_alloc_coherent(). It is identical to dma_alloc_coherent() except
+for the DMA memory allocated using it is managed and will be
+automatically released on driver detach. Implementation looks like
+the following::
+
+ struct dma_devres {
+ size_t size;
+ void *vaddr;
+ dma_addr_t dma_handle;
+ };
+
+ static void dmam_coherent_release(struct device *dev, void *res)
+ {
+ struct dma_devres *this = res;
+
+ dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle);
+ }
+
+ dmam_alloc_coherent(dev, size, dma_handle, gfp)
+ {
+ struct dma_devres *dr;
+ void *vaddr;
+
+ dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp);
+ ...
+
+ /* alloc DMA memory as usual */
+ vaddr = dma_alloc_coherent(...);
+ ...
+
+ /* record size, vaddr, dma_handle in dr */
+ dr->vaddr = vaddr;
+ ...
+
+ devres_add(dev, dr);
+
+ return vaddr;
+ }
+
+If a driver uses dmam_alloc_coherent(), the area is guaranteed to be
+freed whether initialization fails half-way or the device gets
+detached. If most resources are acquired using managed interface, a
+driver can have much simpler init and exit code. Init path basically
+looks like the following::
+
+ my_init_one()
+ {
+ struct mydev *d;
+
+ d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
+ if (!d)
+ return -ENOMEM;
+
+ d->ring = dmam_alloc_coherent(...);
+ if (!d->ring)
+ return -ENOMEM;
+
+ if (check something)
+ return -EINVAL;
+ ...
+
+ return register_to_upper_layer(d);
+ }
+
+And exit path::
+
+ my_remove_one()
+ {
+ unregister_from_upper_layer(d);
+ shutdown_my_hardware();
+ }
+
+As shown above, low level drivers can be simplified a lot by using
+devres. Complexity is shifted from less maintained low level drivers
+to better maintained higher layer. Also, as init failure path is
+shared with exit path, both can get more testing.
+
+Note though that when converting current calls or assignments to
+managed devm_* versions it is up to you to check if internal operations
+like allocating memory, have failed. Managed resources pertains to the
+freeing of these resources *only* - all other checks needed are still
+on you. In some cases this may mean introducing checks that were not
+necessary before moving to the managed devm_* calls.
+
+
+3. Devres group
+---------------
+
+Devres entries can be grouped using devres group. When a group is
+released, all contained normal devres entries and properly nested
+groups are released. One usage is to rollback series of acquired
+resources on failure. For example::
+
+ if (!devres_open_group(dev, NULL, GFP_KERNEL))
+ return -ENOMEM;
+
+ acquire A;
+ if (failed)
+ goto err;
+
+ acquire B;
+ if (failed)
+ goto err;
+ ...
+
+ devres_remove_group(dev, NULL);
+ return 0;
+
+ err:
+ devres_release_group(dev, NULL);
+ return err_code;
+
+As resource acquisition failure usually means probe failure, constructs
+like above are usually useful in midlayer driver (e.g. libata core
+layer) where interface function shouldn't have side effect on failure.
+For LLDs, just returning error code suffices in most cases.
+
+Each group is identified by `void *id`. It can either be explicitly
+specified by @id argument to devres_open_group() or automatically
+created by passing NULL as @id as in the above example. In both
+cases, devres_open_group() returns the group's id. The returned id
+can be passed to other devres functions to select the target group.
+If NULL is given to those functions, the latest open group is
+selected.
+
+For example, you can do something like the following::
+
+ int my_midlayer_create_something()
+ {
+ if (!devres_open_group(dev, my_midlayer_create_something, GFP_KERNEL))
+ return -ENOMEM;
+
+ ...
+
+ devres_close_group(dev, my_midlayer_create_something);
+ return 0;
+ }
+
+ void my_midlayer_destroy_something()
+ {
+ devres_release_group(dev, my_midlayer_create_something);
+ }
+
+
+4. Details
+----------
+
+Lifetime of a devres entry begins on devres allocation and finishes
+when it is released or destroyed (removed and freed) - no reference
+counting.
+
+devres core guarantees atomicity to all basic devres operations and
+has support for single-instance devres types (atomic
+lookup-and-add-if-not-found). Other than that, synchronizing
+concurrent accesses to allocated devres data is caller's
+responsibility. This is usually non-issue because bus ops and
+resource allocations already do the job.
+
+For an example of single-instance devres type, read pcim_iomap_table()
+in lib/devres.c.
+
+All devres interface functions can be called without context if the
+right gfp mask is given.
+
+
+5. Overhead
+-----------
+
+Each devres bookkeeping info is allocated together with requested data
+area. With debug option turned off, bookkeeping info occupies 16
+bytes on 32bit machines and 24 bytes on 64bit (three pointers rounded
+up to ull alignment). If singly linked list is used, it can be
+reduced to two pointers (8 bytes on 32bit, 16 bytes on 64bit).
+
+Each devres group occupies 8 pointers. It can be reduced to 6 if
+singly linked list is used.
+
+Memory space overhead on ahci controller with two ports is between 300
+and 400 bytes on 32bit machine after naive conversion (we can
+certainly invest a bit more effort into libata core layer).
+
+
+6. List of managed interfaces
+-----------------------------
+
+CLOCK
+ devm_clk_get()
+ devm_clk_get_optional()
+ devm_clk_put()
+ devm_clk_bulk_get()
+ devm_clk_bulk_get_all()
+ devm_clk_bulk_get_optional()
+ devm_get_clk_from_child()
+ devm_clk_hw_register()
+ devm_of_clk_add_hw_provider()
+ devm_clk_hw_register_clkdev()
+
+DMA
+ dmaenginem_async_device_register()
+ dmam_alloc_coherent()
+ dmam_alloc_attrs()
+ dmam_free_coherent()
+ dmam_pool_create()
+ dmam_pool_destroy()
+
+DRM
+ devm_drm_dev_alloc()
+
+GPIO
+ devm_gpiod_get()
+ devm_gpiod_get_array()
+ devm_gpiod_get_array_optional()
+ devm_gpiod_get_index()
+ devm_gpiod_get_index_optional()
+ devm_gpiod_get_optional()
+ devm_gpiod_put()
+ devm_gpiod_unhinge()
+ devm_gpiochip_add_data()
+ devm_gpio_request()
+ devm_gpio_request_one()
+
+I2C
+ devm_i2c_add_adapter()
+ devm_i2c_new_dummy_device()
+
+IIO
+ devm_iio_device_alloc()
+ devm_iio_device_register()
+ devm_iio_dmaengine_buffer_setup()
+ devm_iio_kfifo_buffer_setup()
+ devm_iio_kfifo_buffer_setup_ext()
+ devm_iio_map_array_register()
+ devm_iio_triggered_buffer_setup()
+ devm_iio_triggered_buffer_setup_ext()
+ devm_iio_trigger_alloc()
+ devm_iio_trigger_register()
+ devm_iio_channel_get()
+ devm_iio_channel_get_all()
+ devm_iio_hw_consumer_alloc()
+ devm_fwnode_iio_channel_get_by_name()
+
+INPUT
+ devm_input_allocate_device()
+
+IO region
+ devm_release_mem_region()
+ devm_release_region()
+ devm_release_resource()
+ devm_request_mem_region()
+ devm_request_free_mem_region()
+ devm_request_region()
+ devm_request_resource()
+
+IOMAP
+ devm_ioport_map()
+ devm_ioport_unmap()
+ devm_ioremap()
+ devm_ioremap_uc()
+ devm_ioremap_wc()
+ devm_ioremap_resource() : checks resource, requests memory region, ioremaps
+ devm_ioremap_resource_wc()
+ devm_platform_ioremap_resource() : calls devm_ioremap_resource() for platform device
+ devm_platform_ioremap_resource_byname()
+ devm_platform_get_and_ioremap_resource()
+ devm_iounmap()
+ pcim_iomap()
+ pcim_iomap_regions() : do request_region() and iomap() on multiple BARs
+ pcim_iomap_table() : array of mapped addresses indexed by BAR
+ pcim_iounmap()
+
+IRQ
+ devm_free_irq()
+ devm_request_any_context_irq()
+ devm_request_irq()
+ devm_request_threaded_irq()
+ devm_irq_alloc_descs()
+ devm_irq_alloc_desc()
+ devm_irq_alloc_desc_at()
+ devm_irq_alloc_desc_from()
+ devm_irq_alloc_descs_from()
+ devm_irq_alloc_generic_chip()
+ devm_irq_setup_generic_chip()
+ devm_irq_domain_create_sim()
+
+LED
+ devm_led_classdev_register()
+ devm_led_classdev_register_ext()
+ devm_led_classdev_unregister()
+ devm_led_trigger_register()
+ devm_of_led_get()
+
+MDIO
+ devm_mdiobus_alloc()
+ devm_mdiobus_alloc_size()
+ devm_mdiobus_register()
+ devm_of_mdiobus_register()
+
+MEM
+ devm_free_pages()
+ devm_get_free_pages()
+ devm_kasprintf()
+ devm_kcalloc()
+ devm_kfree()
+ devm_kmalloc()
+ devm_kmalloc_array()
+ devm_kmemdup()
+ devm_krealloc()
+ devm_krealloc_array()
+ devm_kstrdup()
+ devm_kstrdup_const()
+ devm_kvasprintf()
+ devm_kzalloc()
+
+MFD
+ devm_mfd_add_devices()
+
+MUX
+ devm_mux_chip_alloc()
+ devm_mux_chip_register()
+ devm_mux_control_get()
+ devm_mux_state_get()
+
+NET
+ devm_alloc_etherdev()
+ devm_alloc_etherdev_mqs()
+ devm_register_netdev()
+
+PER-CPU MEM
+ devm_alloc_percpu()
+ devm_free_percpu()
+
+PCI
+ devm_pci_alloc_host_bridge() : managed PCI host bridge allocation
+ devm_pci_remap_cfgspace() : ioremap PCI configuration space
+ devm_pci_remap_cfg_resource() : ioremap PCI configuration space resource
+ pcim_enable_device() : after success, all PCI ops become managed
+ pcim_pin_device() : keep PCI device enabled after release
+
+PHY
+ devm_usb_get_phy()
+ devm_usb_get_phy_by_node()
+ devm_usb_get_phy_by_phandle()
+ devm_usb_put_phy()
+
+PINCTRL
+ devm_pinctrl_get()
+ devm_pinctrl_put()
+ devm_pinctrl_get_select()
+ devm_pinctrl_register()
+ devm_pinctrl_register_and_init()
+ devm_pinctrl_unregister()
+
+POWER
+ devm_reboot_mode_register()
+ devm_reboot_mode_unregister()
+
+PWM
+ devm_pwmchip_add()
+ devm_pwm_get()
+ devm_fwnode_pwm_get()
+
+REGULATOR
+ devm_regulator_bulk_register_supply_alias()
+ devm_regulator_bulk_get()
+ devm_regulator_bulk_get_const()
+ devm_regulator_bulk_get_enable()
+ devm_regulator_bulk_put()
+ devm_regulator_get()
+ devm_regulator_get_enable()
+ devm_regulator_get_enable_optional()
+ devm_regulator_get_exclusive()
+ devm_regulator_get_optional()
+ devm_regulator_irq_helper()
+ devm_regulator_put()
+ devm_regulator_register()
+ devm_regulator_register_notifier()
+ devm_regulator_register_supply_alias()
+ devm_regulator_unregister_notifier()
+
+RESET
+ devm_reset_control_get()
+ devm_reset_controller_register()
+
+RTC
+ devm_rtc_device_register()
+ devm_rtc_allocate_device()
+ devm_rtc_register_device()
+ devm_rtc_nvmem_register()
+
+SERDEV
+ devm_serdev_device_open()
+
+SLAVE DMA ENGINE
+ devm_acpi_dma_controller_register()
+ devm_acpi_dma_controller_free()
+
+SPI
+ devm_spi_alloc_master()
+ devm_spi_alloc_slave()
+ devm_spi_register_master()
+
+WATCHDOG
+ devm_watchdog_register_device()
diff --git a/Documentation/driver-api/driver-model/driver.rst b/Documentation/driver-api/driver-model/driver.rst
new file mode 100644
index 0000000000..06f818b1d6
--- /dev/null
+++ b/Documentation/driver-api/driver-model/driver.rst
@@ -0,0 +1,286 @@
+==============
+Device Drivers
+==============
+
+See the kerneldoc for the struct device_driver.
+
+Allocation
+~~~~~~~~~~
+
+Device drivers are statically allocated structures. Though there may
+be multiple devices in a system that a driver supports, struct
+device_driver represents the driver as a whole (not a particular
+device instance).
+
+Initialization
+~~~~~~~~~~~~~~
+
+The driver must initialize at least the name and bus fields. It should
+also initialize the devclass field (when it arrives), so it may obtain
+the proper linkage internally. It should also initialize as many of
+the callbacks as possible, though each is optional.
+
+Declaration
+~~~~~~~~~~~
+
+As stated above, struct device_driver objects are statically
+allocated. Below is an example declaration of the eepro100
+driver. This declaration is hypothetical only; it relies on the driver
+being converted completely to the new model::
+
+ static struct device_driver eepro100_driver = {
+ .name = "eepro100",
+ .bus = &pci_bus_type,
+
+ .probe = eepro100_probe,
+ .remove = eepro100_remove,
+ .suspend = eepro100_suspend,
+ .resume = eepro100_resume,
+ };
+
+Most drivers will not be able to be converted completely to the new
+model because the bus they belong to has a bus-specific structure with
+bus-specific fields that cannot be generalized.
+
+The most common example of this are device ID structures. A driver
+typically defines an array of device IDs that it supports. The format
+of these structures and the semantics for comparing device IDs are
+completely bus-specific. Defining them as bus-specific entities would
+sacrifice type-safety, so we keep bus-specific structures around.
+
+Bus-specific drivers should include a generic struct device_driver in
+the definition of the bus-specific driver. Like this::
+
+ struct pci_driver {
+ const struct pci_device_id *id_table;
+ struct device_driver driver;
+ };
+
+A definition that included bus-specific fields would look like
+(using the eepro100 driver again)::
+
+ static struct pci_driver eepro100_driver = {
+ .id_table = eepro100_pci_tbl,
+ .driver = {
+ .name = "eepro100",
+ .bus = &pci_bus_type,
+ .probe = eepro100_probe,
+ .remove = eepro100_remove,
+ .suspend = eepro100_suspend,
+ .resume = eepro100_resume,
+ },
+ };
+
+Some may find the syntax of embedded struct initialization awkward or
+even a bit ugly. So far, it's the best way we've found to do what we want...
+
+Registration
+~~~~~~~~~~~~
+
+::
+
+ int driver_register(struct device_driver *drv);
+
+The driver registers the structure on startup. For drivers that have
+no bus-specific fields (i.e. don't have a bus-specific driver
+structure), they would use driver_register and pass a pointer to their
+struct device_driver object.
+
+Most drivers, however, will have a bus-specific structure and will
+need to register with the bus using something like pci_driver_register.
+
+It is important that drivers register their driver structure as early as
+possible. Registration with the core initializes several fields in the
+struct device_driver object, including the reference count and the
+lock. These fields are assumed to be valid at all times and may be
+used by the device model core or the bus driver.
+
+
+Transition Bus Drivers
+~~~~~~~~~~~~~~~~~~~~~~
+
+By defining wrapper functions, the transition to the new model can be
+made easier. Drivers can ignore the generic structure altogether and
+let the bus wrapper fill in the fields. For the callbacks, the bus can
+define generic callbacks that forward the call to the bus-specific
+callbacks of the drivers.
+
+This solution is intended to be only temporary. In order to get class
+information in the driver, the drivers must be modified anyway. Since
+converting drivers to the new model should reduce some infrastructural
+complexity and code size, it is recommended that they are converted as
+class information is added.
+
+Access
+~~~~~~
+
+Once the object has been registered, it may access the common fields of
+the object, like the lock and the list of devices::
+
+ int driver_for_each_dev(struct device_driver *drv, void *data,
+ int (*callback)(struct device *dev, void *data));
+
+The devices field is a list of all the devices that have been bound to
+the driver. The LDM core provides a helper function to operate on all
+the devices a driver controls. This helper locks the driver on each
+node access, and does proper reference counting on each device as it
+accesses it.
+
+
+sysfs
+~~~~~
+
+When a driver is registered, a sysfs directory is created in its
+bus's directory. In this directory, the driver can export an interface
+to userspace to control operation of the driver on a global basis;
+e.g. toggling debugging output in the driver.
+
+A future feature of this directory will be a 'devices' directory. This
+directory will contain symlinks to the directories of devices it
+supports.
+
+
+
+Callbacks
+~~~~~~~~~
+
+::
+
+ int (*probe) (struct device *dev);
+
+The probe() entry is called in task context, with the bus's rwsem locked
+and the driver partially bound to the device. Drivers commonly use
+container_of() to convert "dev" to a bus-specific type, both in probe()
+and other routines. That type often provides device resource data, such
+as pci_dev.resource[] or platform_device.resources, which is used in
+addition to dev->platform_data to initialize the driver.
+
+This callback holds the driver-specific logic to bind the driver to a
+given device. That includes verifying that the device is present, that
+it's a version the driver can handle, that driver data structures can
+be allocated and initialized, and that any hardware can be initialized.
+Drivers often store a pointer to their state with dev_set_drvdata().
+When the driver has successfully bound itself to that device, then probe()
+returns zero and the driver model code will finish its part of binding
+the driver to that device.
+
+A driver's probe() may return a negative errno value to indicate that
+the driver did not bind to this device, in which case it should have
+released all resources it allocated.
+
+Optionally, probe() may return -EPROBE_DEFER if the driver depends on
+resources that are not yet available (e.g., supplied by a driver that
+hasn't initialized yet). The driver core will put the device onto the
+deferred probe list and will try to call it again later. If a driver
+must defer, it should return -EPROBE_DEFER as early as possible to
+reduce the amount of time spent on setup work that will need to be
+unwound and reexecuted at a later time.
+
+.. warning::
+ -EPROBE_DEFER must not be returned if probe() has already created
+ child devices, even if those child devices are removed again
+ in a cleanup path. If -EPROBE_DEFER is returned after a child
+ device has been registered, it may result in an infinite loop of
+ .probe() calls to the same driver.
+
+::
+
+ void (*sync_state) (struct device *dev);
+
+sync_state is called only once for a device. It's called when all the consumer
+devices of the device have successfully probed. The list of consumers of the
+device is obtained by looking at the device links connecting that device to its
+consumer devices.
+
+The first attempt to call sync_state() is made during late_initcall_sync() to
+give firmware and drivers time to link devices to each other. During the first
+attempt at calling sync_state(), if all the consumers of the device at that
+point in time have already probed successfully, sync_state() is called right
+away. If there are no consumers of the device during the first attempt, that
+too is considered as "all consumers of the device have probed" and sync_state()
+is called right away.
+
+If during the first attempt at calling sync_state() for a device, there are
+still consumers that haven't probed successfully, the sync_state() call is
+postponed and reattempted in the future only when one or more consumers of the
+device probe successfully. If during the reattempt, the driver core finds that
+there are one or more consumers of the device that haven't probed yet, then
+sync_state() call is postponed again.
+
+A typical use case for sync_state() is to have the kernel cleanly take over
+management of devices from the bootloader. For example, if a device is left on
+and at a particular hardware configuration by the bootloader, the device's
+driver might need to keep the device in the boot configuration until all the
+consumers of the device have probed. Once all the consumers of the device have
+probed, the device's driver can synchronize the hardware state of the device to
+match the aggregated software state requested by all the consumers. Hence the
+name sync_state().
+
+While obvious examples of resources that can benefit from sync_state() include
+resources such as regulator, sync_state() can also be useful for complex
+resources like IOMMUs. For example, IOMMUs with multiple consumers (devices
+whose addresses are remapped by the IOMMU) might need to keep their mappings
+fixed at (or additive to) the boot configuration until all its consumers have
+probed.
+
+While the typical use case for sync_state() is to have the kernel cleanly take
+over management of devices from the bootloader, the usage of sync_state() is
+not restricted to that. Use it whenever it makes sense to take an action after
+all the consumers of a device have probed::
+
+ int (*remove) (struct device *dev);
+
+remove is called to unbind a driver from a device. This may be
+called if a device is physically removed from the system, if the
+driver module is being unloaded, during a reboot sequence, or
+in other cases.
+
+It is up to the driver to determine if the device is present or
+not. It should free any resources allocated specifically for the
+device; i.e. anything in the device's driver_data field.
+
+If the device is still present, it should quiesce the device and place
+it into a supported low-power state.
+
+::
+
+ int (*suspend) (struct device *dev, pm_message_t state);
+
+suspend is called to put the device in a low power state.
+
+::
+
+ int (*resume) (struct device *dev);
+
+Resume is used to bring a device back from a low power state.
+
+
+Attributes
+~~~~~~~~~~
+
+::
+
+ struct driver_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct device_driver *driver, char *buf);
+ ssize_t (*store)(struct device_driver *, const char *buf, size_t count);
+ };
+
+Device drivers can export attributes via their sysfs directories.
+Drivers can declare attributes using a DRIVER_ATTR_RW and DRIVER_ATTR_RO
+macro that works identically to the DEVICE_ATTR_RW and DEVICE_ATTR_RO
+macros.
+
+Example::
+
+ DRIVER_ATTR_RW(debug);
+
+This is equivalent to declaring::
+
+ struct driver_attribute driver_attr_debug;
+
+This can then be used to add and remove the attribute from the
+driver's directory using::
+
+ int driver_create_file(struct device_driver *, const struct driver_attribute *);
+ void driver_remove_file(struct device_driver *, const struct driver_attribute *);
diff --git a/Documentation/driver-api/driver-model/index.rst b/Documentation/driver-api/driver-model/index.rst
new file mode 100644
index 0000000000..4831bdd92e
--- /dev/null
+++ b/Documentation/driver-api/driver-model/index.rst
@@ -0,0 +1,23 @@
+============
+Driver Model
+============
+
+.. toctree::
+ :maxdepth: 1
+
+ binding
+ bus
+ design-patterns
+ device
+ devres
+ driver
+ overview
+ platform
+ porting
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/driver-model/overview.rst b/Documentation/driver-api/driver-model/overview.rst
new file mode 100644
index 0000000000..e98d0ab4a9
--- /dev/null
+++ b/Documentation/driver-api/driver-model/overview.rst
@@ -0,0 +1,124 @@
+=============================
+The Linux Kernel Device Model
+=============================
+
+Patrick Mochel <mochel@digitalimplant.org>
+
+Drafted 26 August 2002
+Updated 31 January 2006
+
+
+Overview
+~~~~~~~~
+
+The Linux Kernel Driver Model is a unification of all the disparate driver
+models that were previously used in the kernel. It is intended to augment the
+bus-specific drivers for bridges and devices by consolidating a set of data
+and operations into globally accessible data structures.
+
+Traditional driver models implemented some sort of tree-like structure
+(sometimes just a list) for the devices they control. There wasn't any
+uniformity across the different bus types.
+
+The current driver model provides a common, uniform data model for describing
+a bus and the devices that can appear under the bus. The unified bus
+model includes a set of common attributes which all busses carry, and a set
+of common callbacks, such as device discovery during bus probing, bus
+shutdown, bus power management, etc.
+
+The common device and bridge interface reflects the goals of the modern
+computer: namely the ability to do seamless device "plug and play", power
+management, and hot plug. In particular, the model dictated by Intel and
+Microsoft (namely ACPI) ensures that almost every device on almost any bus
+on an x86-compatible system can work within this paradigm. Of course,
+not every bus is able to support all such operations, although most
+buses support most of those operations.
+
+
+Downstream Access
+~~~~~~~~~~~~~~~~~
+
+Common data fields have been moved out of individual bus layers into a common
+data structure. These fields must still be accessed by the bus layers,
+and sometimes by the device-specific drivers.
+
+Other bus layers are encouraged to do what has been done for the PCI layer.
+struct pci_dev now looks like this::
+
+ struct pci_dev {
+ ...
+
+ struct device dev; /* Generic device interface */
+ ...
+ };
+
+Note first that the struct device dev within the struct pci_dev is
+statically allocated. This means only one allocation on device discovery.
+
+Note also that that struct device dev is not necessarily defined at the
+front of the pci_dev structure. This is to make people think about what
+they're doing when switching between the bus driver and the global driver,
+and to discourage meaningless and incorrect casts between the two.
+
+The PCI bus layer freely accesses the fields of struct device. It knows about
+the structure of struct pci_dev, and it should know the structure of struct
+device. Individual PCI device drivers that have been converted to the current
+driver model generally do not and should not touch the fields of struct device,
+unless there is a compelling reason to do so.
+
+The above abstraction prevents unnecessary pain during transitional phases.
+If it were not done this way, then when a field was renamed or removed, every
+downstream driver would break. On the other hand, if only the bus layer
+(and not the device layer) accesses the struct device, it is only the bus
+layer that needs to change.
+
+
+User Interface
+~~~~~~~~~~~~~~
+
+By virtue of having a complete hierarchical view of all the devices in the
+system, exporting a complete hierarchical view to userspace becomes relatively
+easy. This has been accomplished by implementing a special purpose virtual
+file system named sysfs.
+
+Almost all mainstream Linux distros mount this filesystem automatically; you
+can see some variation of the following in the output of the "mount" command::
+
+ $ mount
+ ...
+ none on /sys type sysfs (rw,noexec,nosuid,nodev)
+ ...
+ $
+
+The auto-mounting of sysfs is typically accomplished by an entry similar to
+the following in the /etc/fstab file::
+
+ none /sys sysfs defaults 0 0
+
+or something similar in the /lib/init/fstab file on Debian-based systems::
+
+ none /sys sysfs nodev,noexec,nosuid 0 0
+
+If sysfs is not automatically mounted, you can always do it manually with::
+
+ # mount -t sysfs sysfs /sys
+
+Whenever a device is inserted into the tree, a directory is created for it.
+This directory may be populated at each layer of discovery - the global layer,
+the bus layer, or the device layer.
+
+The global layer currently creates two files - 'name' and 'power'. The
+former only reports the name of the device. The latter reports the
+current power state of the device. It will also be used to set the current
+power state.
+
+The bus layer may also create files for the devices it finds while probing the
+bus. For example, the PCI layer currently creates 'irq' and 'resource' files
+for each PCI device.
+
+A device-specific driver may also export files in its directory to expose
+device-specific data or tunable interfaces.
+
+More information about the sysfs directory layout can be found in
+the other documents in this directory and in the file
+Documentation/filesystems/sysfs.rst.
diff --git a/Documentation/driver-api/driver-model/platform.rst b/Documentation/driver-api/driver-model/platform.rst
new file mode 100644
index 0000000000..1fe5c6c619
--- /dev/null
+++ b/Documentation/driver-api/driver-model/platform.rst
@@ -0,0 +1,246 @@
+============================
+Platform Devices and Drivers
+============================
+
+See <linux/platform_device.h> for the driver model interface to the
+platform bus: platform_device, and platform_driver. This pseudo-bus
+is used to connect devices on busses with minimal infrastructure,
+like those used to integrate peripherals on many system-on-chip
+processors, or some "legacy" PC interconnects; as opposed to large
+formally specified ones like PCI or USB.
+
+
+Platform devices
+~~~~~~~~~~~~~~~~
+Platform devices are devices that typically appear as autonomous
+entities in the system. This includes legacy port-based devices and
+host bridges to peripheral buses, and most controllers integrated
+into system-on-chip platforms. What they usually have in common
+is direct addressing from a CPU bus. Rarely, a platform_device will
+be connected through a segment of some other kind of bus; but its
+registers will still be directly addressable.
+
+Platform devices are given a name, used in driver binding, and a
+list of resources such as addresses and IRQs::
+
+ struct platform_device {
+ const char *name;
+ u32 id;
+ struct device dev;
+ u32 num_resources;
+ struct resource *resource;
+ };
+
+
+Platform drivers
+~~~~~~~~~~~~~~~~
+Platform drivers follow the standard driver model convention, where
+discovery/enumeration is handled outside the drivers, and drivers
+provide probe() and remove() methods. They support power management
+and shutdown notifications using the standard conventions::
+
+ struct platform_driver {
+ int (*probe)(struct platform_device *);
+ int (*remove)(struct platform_device *);
+ void (*shutdown)(struct platform_device *);
+ int (*suspend)(struct platform_device *, pm_message_t state);
+ int (*suspend_late)(struct platform_device *, pm_message_t state);
+ int (*resume_early)(struct platform_device *);
+ int (*resume)(struct platform_device *);
+ struct device_driver driver;
+ };
+
+Note that probe() should in general verify that the specified device hardware
+actually exists; sometimes platform setup code can't be sure. The probing
+can use device resources, including clocks, and device platform_data.
+
+Platform drivers register themselves the normal way::
+
+ int platform_driver_register(struct platform_driver *drv);
+
+Or, in common situations where the device is known not to be hot-pluggable,
+the probe() routine can live in an init section to reduce the driver's
+runtime memory footprint::
+
+ int platform_driver_probe(struct platform_driver *drv,
+ int (*probe)(struct platform_device *))
+
+Kernel modules can be composed of several platform drivers. The platform core
+provides helpers to register and unregister an array of drivers::
+
+ int __platform_register_drivers(struct platform_driver * const *drivers,
+ unsigned int count, struct module *owner);
+ void platform_unregister_drivers(struct platform_driver * const *drivers,
+ unsigned int count);
+
+If one of the drivers fails to register, all drivers registered up to that
+point will be unregistered in reverse order. Note that there is a convenience
+macro that passes THIS_MODULE as owner parameter::
+
+ #define platform_register_drivers(drivers, count)
+
+
+Device Enumeration
+~~~~~~~~~~~~~~~~~~
+As a rule, platform specific (and often board-specific) setup code will
+register platform devices::
+
+ int platform_device_register(struct platform_device *pdev);
+
+ int platform_add_devices(struct platform_device **pdevs, int ndev);
+
+The general rule is to register only those devices that actually exist,
+but in some cases extra devices might be registered. For example, a kernel
+might be configured to work with an external network adapter that might not
+be populated on all boards, or likewise to work with an integrated controller
+that some boards might not hook up to any peripherals.
+
+In some cases, boot firmware will export tables describing the devices
+that are populated on a given board. Without such tables, often the
+only way for system setup code to set up the correct devices is to build
+a kernel for a specific target board. Such board-specific kernels are
+common with embedded and custom systems development.
+
+In many cases, the memory and IRQ resources associated with the platform
+device are not enough to let the device's driver work. Board setup code
+will often provide additional information using the device's platform_data
+field to hold additional information.
+
+Embedded systems frequently need one or more clocks for platform devices,
+which are normally kept off until they're actively needed (to save power).
+System setup also associates those clocks with the device, so that
+calls to clk_get(&pdev->dev, clock_name) return them as needed.
+
+
+Legacy Drivers: Device Probing
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Some drivers are not fully converted to the driver model, because they take
+on a non-driver role: the driver registers its platform device, rather than
+leaving that for system infrastructure. Such drivers can't be hotplugged
+or coldplugged, since those mechanisms require device creation to be in a
+different system component than the driver.
+
+The only "good" reason for this is to handle older system designs which, like
+original IBM PCs, rely on error-prone "probe-the-hardware" models for hardware
+configuration. Newer systems have largely abandoned that model, in favor of
+bus-level support for dynamic configuration (PCI, USB), or device tables
+provided by the boot firmware (e.g. PNPACPI on x86). There are too many
+conflicting options about what might be where, and even educated guesses by
+an operating system will be wrong often enough to make trouble.
+
+This style of driver is discouraged. If you're updating such a driver,
+please try to move the device enumeration to a more appropriate location,
+outside the driver. This will usually be cleanup, since such drivers
+tend to already have "normal" modes, such as ones using device nodes that
+were created by PNP or by platform device setup.
+
+None the less, there are some APIs to support such legacy drivers. Avoid
+using these calls except with such hotplug-deficient drivers::
+
+ struct platform_device *platform_device_alloc(
+ const char *name, int id);
+
+You can use platform_device_alloc() to dynamically allocate a device, which
+you will then initialize with resources and platform_device_register().
+A better solution is usually::
+
+ struct platform_device *platform_device_register_simple(
+ const char *name, int id,
+ struct resource *res, unsigned int nres);
+
+You can use platform_device_register_simple() as a one-step call to allocate
+and register a device.
+
+
+Device Naming and Driver Binding
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The platform_device.dev.bus_id is the canonical name for the devices.
+It's built from two components:
+
+ * platform_device.name ... which is also used to for driver matching.
+
+ * platform_device.id ... the device instance number, or else "-1"
+ to indicate there's only one.
+
+These are concatenated, so name/id "serial"/0 indicates bus_id "serial.0", and
+"serial/3" indicates bus_id "serial.3"; both would use the platform_driver
+named "serial". While "my_rtc"/-1 would be bus_id "my_rtc" (no instance id)
+and use the platform_driver called "my_rtc".
+
+Driver binding is performed automatically by the driver core, invoking
+driver probe() after finding a match between device and driver. If the
+probe() succeeds, the driver and device are bound as usual. There are
+three different ways to find such a match:
+
+ - Whenever a device is registered, the drivers for that bus are
+ checked for matches. Platform devices should be registered very
+ early during system boot.
+
+ - When a driver is registered using platform_driver_register(), all
+ unbound devices on that bus are checked for matches. Drivers
+ usually register later during booting, or by module loading.
+
+ - Registering a driver using platform_driver_probe() works just like
+ using platform_driver_register(), except that the driver won't
+ be probed later if another device registers. (Which is OK, since
+ this interface is only for use with non-hotpluggable devices.)
+
+
+Early Platform Devices and Drivers
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The early platform interfaces provide platform data to platform device
+drivers early on during the system boot. The code is built on top of the
+early_param() command line parsing and can be executed very early on.
+
+Example: "earlyprintk" class early serial console in 6 steps
+
+1. Registering early platform device data
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The architecture code registers platform device data using the function
+early_platform_add_devices(). In the case of early serial console this
+should be hardware configuration for the serial port. Devices registered
+at this point will later on be matched against early platform drivers.
+
+2. Parsing kernel command line
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The architecture code calls parse_early_param() to parse the kernel
+command line. This will execute all matching early_param() callbacks.
+User specified early platform devices will be registered at this point.
+For the early serial console case the user can specify port on the
+kernel command line as "earlyprintk=serial.0" where "earlyprintk" is
+the class string, "serial" is the name of the platform driver and
+0 is the platform device id. If the id is -1 then the dot and the
+id can be omitted.
+
+3. Installing early platform drivers belonging to a certain class
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The architecture code may optionally force registration of all early
+platform drivers belonging to a certain class using the function
+early_platform_driver_register_all(). User specified devices from
+step 2 have priority over these. This step is omitted by the serial
+driver example since the early serial driver code should be disabled
+unless the user has specified port on the kernel command line.
+
+4. Early platform driver registration
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Compiled-in platform drivers making use of early_platform_init() are
+automatically registered during step 2 or 3. The serial driver example
+should use early_platform_init("earlyprintk", &platform_driver).
+
+5. Probing of early platform drivers belonging to a certain class
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The architecture code calls early_platform_driver_probe() to match
+registered early platform devices associated with a certain class with
+registered early platform drivers. Matched devices will get probed().
+This step can be executed at any point during the early boot. As soon
+as possible may be good for the serial port case.
+
+6. Inside the early platform driver probe()
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The driver code needs to take special care during early boot, especially
+when it comes to memory allocation and interrupt registration. The code
+in the probe() function can use is_early_platform_device() to check if
+it is called at early platform device or at the regular platform device
+time. The early serial driver performs register_console() at this point.
+
+For further information, see <linux/platform_device.h>.
diff --git a/Documentation/driver-api/driver-model/porting.rst b/Documentation/driver-api/driver-model/porting.rst
new file mode 100644
index 0000000000..931ea879af
--- /dev/null
+++ b/Documentation/driver-api/driver-model/porting.rst
@@ -0,0 +1,448 @@
+=======================================
+Porting Drivers to the New Driver Model
+=======================================
+
+Patrick Mochel
+
+7 January 2003
+
+
+Overview
+
+Please refer to `Documentation/driver-api/driver-model/*.rst` for definitions of
+various driver types and concepts.
+
+Most of the work of porting devices drivers to the new model happens
+at the bus driver layer. This was intentional, to minimize the
+negative effect on kernel drivers, and to allow a gradual transition
+of bus drivers.
+
+In a nutshell, the driver model consists of a set of objects that can
+be embedded in larger, bus-specific objects. Fields in these generic
+objects can replace fields in the bus-specific objects.
+
+The generic objects must be registered with the driver model core. By
+doing so, they will exported via the sysfs filesystem. sysfs can be
+mounted by doing::
+
+ # mount -t sysfs sysfs /sys
+
+
+
+The Process
+
+Step 0: Read include/linux/device.h for object and function definitions.
+
+Step 1: Registering the bus driver.
+
+
+- Define a struct bus_type for the bus driver::
+
+ struct bus_type pci_bus_type = {
+ .name = "pci",
+ };
+
+
+- Register the bus type.
+
+ This should be done in the initialization function for the bus type,
+ which is usually the module_init(), or equivalent, function::
+
+ static int __init pci_driver_init(void)
+ {
+ return bus_register(&pci_bus_type);
+ }
+
+ subsys_initcall(pci_driver_init);
+
+
+ The bus type may be unregistered (if the bus driver may be compiled
+ as a module) by doing::
+
+ bus_unregister(&pci_bus_type);
+
+
+- Export the bus type for others to use.
+
+ Other code may wish to reference the bus type, so declare it in a
+ shared header file and export the symbol.
+
+From include/linux/pci.h::
+
+ extern struct bus_type pci_bus_type;
+
+
+From file the above code appears in::
+
+ EXPORT_SYMBOL(pci_bus_type);
+
+
+
+- This will cause the bus to show up in /sys/bus/pci/ with two
+ subdirectories: 'devices' and 'drivers'::
+
+ # tree -d /sys/bus/pci/
+ /sys/bus/pci/
+ |-- devices
+ `-- drivers
+
+
+
+Step 2: Registering Devices.
+
+struct device represents a single device. It mainly contains metadata
+describing the relationship the device has to other entities.
+
+
+- Embed a struct device in the bus-specific device type::
+
+
+ struct pci_dev {
+ ...
+ struct device dev; /* Generic device interface */
+ ...
+ };
+
+ It is recommended that the generic device not be the first item in
+ the struct to discourage programmers from doing mindless casts
+ between the object types. Instead macros, or inline functions,
+ should be created to convert from the generic object type::
+
+
+ #define to_pci_dev(n) container_of(n, struct pci_dev, dev)
+
+ or
+
+ static inline struct pci_dev * to_pci_dev(struct kobject * kobj)
+ {
+ return container_of(n, struct pci_dev, dev);
+ }
+
+ This allows the compiler to verify type-safety of the operations
+ that are performed (which is Good).
+
+
+- Initialize the device on registration.
+
+ When devices are discovered or registered with the bus type, the
+ bus driver should initialize the generic device. The most important
+ things to initialize are the bus_id, parent, and bus fields.
+
+ The bus_id is an ASCII string that contains the device's address on
+ the bus. The format of this string is bus-specific. This is
+ necessary for representing devices in sysfs.
+
+ parent is the physical parent of the device. It is important that
+ the bus driver sets this field correctly.
+
+ The driver model maintains an ordered list of devices that it uses
+ for power management. This list must be in order to guarantee that
+ devices are shutdown before their physical parents, and vice versa.
+ The order of this list is determined by the parent of registered
+ devices.
+
+ Also, the location of the device's sysfs directory depends on a
+ device's parent. sysfs exports a directory structure that mirrors
+ the device hierarchy. Accurately setting the parent guarantees that
+ sysfs will accurately represent the hierarchy.
+
+ The device's bus field is a pointer to the bus type the device
+ belongs to. This should be set to the bus_type that was declared
+ and initialized before.
+
+ Optionally, the bus driver may set the device's name and release
+ fields.
+
+ The name field is an ASCII string describing the device, like
+
+ "ATI Technologies Inc Radeon QD"
+
+ The release field is a callback that the driver model core calls
+ when the device has been removed, and all references to it have
+ been released. More on this in a moment.
+
+
+- Register the device.
+
+ Once the generic device has been initialized, it can be registered
+ with the driver model core by doing::
+
+ device_register(&dev->dev);
+
+ It can later be unregistered by doing::
+
+ device_unregister(&dev->dev);
+
+ This should happen on buses that support hotpluggable devices.
+ If a bus driver unregisters a device, it should not immediately free
+ it. It should instead wait for the driver model core to call the
+ device's release method, then free the bus-specific object.
+ (There may be other code that is currently referencing the device
+ structure, and it would be rude to free the device while that is
+ happening).
+
+
+ When the device is registered, a directory in sysfs is created.
+ The PCI tree in sysfs looks like::
+
+ /sys/devices/pci0/
+ |-- 00:00.0
+ |-- 00:01.0
+ | `-- 01:00.0
+ |-- 00:02.0
+ | `-- 02:1f.0
+ | `-- 03:00.0
+ |-- 00:1e.0
+ | `-- 04:04.0
+ |-- 00:1f.0
+ |-- 00:1f.1
+ | |-- ide0
+ | | |-- 0.0
+ | | `-- 0.1
+ | `-- ide1
+ | `-- 1.0
+ |-- 00:1f.2
+ |-- 00:1f.3
+ `-- 00:1f.5
+
+ Also, symlinks are created in the bus's 'devices' directory
+ that point to the device's directory in the physical hierarchy::
+
+ /sys/bus/pci/devices/
+ |-- 00:00.0 -> ../../../devices/pci0/00:00.0
+ |-- 00:01.0 -> ../../../devices/pci0/00:01.0
+ |-- 00:02.0 -> ../../../devices/pci0/00:02.0
+ |-- 00:1e.0 -> ../../../devices/pci0/00:1e.0
+ |-- 00:1f.0 -> ../../../devices/pci0/00:1f.0
+ |-- 00:1f.1 -> ../../../devices/pci0/00:1f.1
+ |-- 00:1f.2 -> ../../../devices/pci0/00:1f.2
+ |-- 00:1f.3 -> ../../../devices/pci0/00:1f.3
+ |-- 00:1f.5 -> ../../../devices/pci0/00:1f.5
+ |-- 01:00.0 -> ../../../devices/pci0/00:01.0/01:00.0
+ |-- 02:1f.0 -> ../../../devices/pci0/00:02.0/02:1f.0
+ |-- 03:00.0 -> ../../../devices/pci0/00:02.0/02:1f.0/03:00.0
+ `-- 04:04.0 -> ../../../devices/pci0/00:1e.0/04:04.0
+
+
+
+Step 3: Registering Drivers.
+
+struct device_driver is a simple driver structure that contains a set
+of operations that the driver model core may call.
+
+
+- Embed a struct device_driver in the bus-specific driver.
+
+ Just like with devices, do something like::
+
+ struct pci_driver {
+ ...
+ struct device_driver driver;
+ };
+
+
+- Initialize the generic driver structure.
+
+ When the driver registers with the bus (e.g. doing pci_register_driver()),
+ initialize the necessary fields of the driver: the name and bus
+ fields.
+
+
+- Register the driver.
+
+ After the generic driver has been initialized, call::
+
+ driver_register(&drv->driver);
+
+ to register the driver with the core.
+
+ When the driver is unregistered from the bus, unregister it from the
+ core by doing::
+
+ driver_unregister(&drv->driver);
+
+ Note that this will block until all references to the driver have
+ gone away. Normally, there will not be any.
+
+
+- Sysfs representation.
+
+ Drivers are exported via sysfs in their bus's 'driver's directory.
+ For example::
+
+ /sys/bus/pci/drivers/
+ |-- 3c59x
+ |-- Ensoniq AudioPCI
+ |-- agpgart-amdk7
+ |-- e100
+ `-- serial
+
+
+Step 4: Define Generic Methods for Drivers.
+
+struct device_driver defines a set of operations that the driver model
+core calls. Most of these operations are probably similar to
+operations the bus already defines for drivers, but taking different
+parameters.
+
+It would be difficult and tedious to force every driver on a bus to
+simultaneously convert their drivers to generic format. Instead, the
+bus driver should define single instances of the generic methods that
+forward call to the bus-specific drivers. For instance::
+
+
+ static int pci_device_remove(struct device * dev)
+ {
+ struct pci_dev * pci_dev = to_pci_dev(dev);
+ struct pci_driver * drv = pci_dev->driver;
+
+ if (drv) {
+ if (drv->remove)
+ drv->remove(pci_dev);
+ pci_dev->driver = NULL;
+ }
+ return 0;
+ }
+
+
+The generic driver should be initialized with these methods before it
+is registered::
+
+ /* initialize common driver fields */
+ drv->driver.name = drv->name;
+ drv->driver.bus = &pci_bus_type;
+ drv->driver.probe = pci_device_probe;
+ drv->driver.resume = pci_device_resume;
+ drv->driver.suspend = pci_device_suspend;
+ drv->driver.remove = pci_device_remove;
+
+ /* register with core */
+ driver_register(&drv->driver);
+
+
+Ideally, the bus should only initialize the fields if they are not
+already set. This allows the drivers to implement their own generic
+methods.
+
+
+Step 5: Support generic driver binding.
+
+The model assumes that a device or driver can be dynamically
+registered with the bus at any time. When registration happens,
+devices must be bound to a driver, or drivers must be bound to all
+devices that it supports.
+
+A driver typically contains a list of device IDs that it supports. The
+bus driver compares these IDs to the IDs of devices registered with it.
+The format of the device IDs, and the semantics for comparing them are
+bus-specific, so the generic model does attempt to generalize them.
+
+Instead, a bus may supply a method in struct bus_type that does the
+comparison::
+
+ int (*match)(struct device * dev, struct device_driver * drv);
+
+match should return positive value if the driver supports the device,
+and zero otherwise. It may also return error code (for example
+-EPROBE_DEFER) if determining that given driver supports the device is
+not possible.
+
+When a device is registered, the bus's list of drivers is iterated
+over. bus->match() is called for each one until a match is found.
+
+When a driver is registered, the bus's list of devices is iterated
+over. bus->match() is called for each device that is not already
+claimed by a driver.
+
+When a device is successfully bound to a driver, device->driver is
+set, the device is added to a per-driver list of devices, and a
+symlink is created in the driver's sysfs directory that points to the
+device's physical directory::
+
+ /sys/bus/pci/drivers/
+ |-- 3c59x
+ | `-- 00:0b.0 -> ../../../../devices/pci0/00:0b.0
+ |-- Ensoniq AudioPCI
+ |-- agpgart-amdk7
+ | `-- 00:00.0 -> ../../../../devices/pci0/00:00.0
+ |-- e100
+ | `-- 00:0c.0 -> ../../../../devices/pci0/00:0c.0
+ `-- serial
+
+
+This driver binding should replace the existing driver binding
+mechanism the bus currently uses.
+
+
+Step 6: Supply a hotplug callback.
+
+Whenever a device is registered with the driver model core, the
+userspace program /sbin/hotplug is called to notify userspace.
+Users can define actions to perform when a device is inserted or
+removed.
+
+The driver model core passes several arguments to userspace via
+environment variables, including
+
+- ACTION: set to 'add' or 'remove'
+- DEVPATH: set to the device's physical path in sysfs.
+
+A bus driver may also supply additional parameters for userspace to
+consume. To do this, a bus must implement the 'hotplug' method in
+struct bus_type::
+
+ int (*hotplug) (struct device *dev, char **envp,
+ int num_envp, char *buffer, int buffer_size);
+
+This is called immediately before /sbin/hotplug is executed.
+
+
+Step 7: Cleaning up the bus driver.
+
+The generic bus, device, and driver structures provide several fields
+that can replace those defined privately to the bus driver.
+
+- Device list.
+
+struct bus_type contains a list of all devices registered with the bus
+type. This includes all devices on all instances of that bus type.
+An internal list that the bus uses may be removed, in favor of using
+this one.
+
+The core provides an iterator to access these devices::
+
+ int bus_for_each_dev(struct bus_type * bus, struct device * start,
+ void * data, int (*fn)(struct device *, void *));
+
+
+- Driver list.
+
+struct bus_type also contains a list of all drivers registered with
+it. An internal list of drivers that the bus driver maintains may
+be removed in favor of using the generic one.
+
+The drivers may be iterated over, like devices::
+
+ int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
+ void * data, int (*fn)(struct device_driver *, void *));
+
+
+Please see drivers/base/bus.c for more information.
+
+
+- rwsem
+
+struct bus_type contains an rwsem that protects all core accesses to
+the device and driver lists. This can be used by the bus driver
+internally, and should be used when accessing the device or driver
+lists the bus maintains.
+
+
+- Device and driver fields.
+
+Some of the fields in struct device and struct device_driver duplicate
+fields in the bus-specific representations of these objects. Feel free
+to remove the bus-specific ones and favor the generic ones. Note
+though, that this will likely mean fixing up all the drivers that
+reference the bus-specific fields (though those should all be 1-line
+changes).
diff --git a/Documentation/driver-api/early-userspace/buffer-format.rst b/Documentation/driver-api/early-userspace/buffer-format.rst
new file mode 100644
index 0000000000..7f74e301fd
--- /dev/null
+++ b/Documentation/driver-api/early-userspace/buffer-format.rst
@@ -0,0 +1,119 @@
+=======================
+initramfs buffer format
+=======================
+
+Al Viro, H. Peter Anvin
+
+Last revision: 2002-01-13
+
+Starting with kernel 2.5.x, the old "initial ramdisk" protocol is
+getting {replaced/complemented} with the new "initial ramfs"
+(initramfs) protocol. The initramfs contents is passed using the same
+memory buffer protocol used by the initrd protocol, but the contents
+is different. The initramfs buffer contains an archive which is
+expanded into a ramfs filesystem; this document details the format of
+the initramfs buffer format.
+
+The initramfs buffer format is based around the "newc" or "crc" CPIO
+formats, and can be created with the cpio(1) utility. The cpio
+archive can be compressed using gzip(1). One valid version of an
+initramfs buffer is thus a single .cpio.gz file.
+
+The full format of the initramfs buffer is defined by the following
+grammar, where::
+
+ * is used to indicate "0 or more occurrences of"
+ (|) indicates alternatives
+ + indicates concatenation
+ GZIP() indicates the gzip(1) of the operand
+ ALGN(n) means padding with null bytes to an n-byte boundary
+
+ initramfs := ("\0" | cpio_archive | cpio_gzip_archive)*
+
+ cpio_gzip_archive := GZIP(cpio_archive)
+
+ cpio_archive := cpio_file* + (<nothing> | cpio_trailer)
+
+ cpio_file := ALGN(4) + cpio_header + filename + "\0" + ALGN(4) + data
+
+ cpio_trailer := ALGN(4) + cpio_header + "TRAILER!!!\0" + ALGN(4)
+
+
+In human terms, the initramfs buffer contains a collection of
+compressed and/or uncompressed cpio archives (in the "newc" or "crc"
+formats); arbitrary amounts zero bytes (for padding) can be added
+between members.
+
+The cpio "TRAILER!!!" entry (cpio end-of-archive) is optional, but is
+not ignored; see "handling of hard links" below.
+
+The structure of the cpio_header is as follows (all fields contain
+hexadecimal ASCII numbers fully padded with '0' on the left to the
+full width of the field, for example, the integer 4780 is represented
+by the ASCII string "000012ac"):
+
+============= ================== ==============================================
+Field name Field size Meaning
+============= ================== ==============================================
+c_magic 6 bytes The string "070701" or "070702"
+c_ino 8 bytes File inode number
+c_mode 8 bytes File mode and permissions
+c_uid 8 bytes File uid
+c_gid 8 bytes File gid
+c_nlink 8 bytes Number of links
+c_mtime 8 bytes Modification time
+c_filesize 8 bytes Size of data field
+c_maj 8 bytes Major part of file device number
+c_min 8 bytes Minor part of file device number
+c_rmaj 8 bytes Major part of device node reference
+c_rmin 8 bytes Minor part of device node reference
+c_namesize 8 bytes Length of filename, including final \0
+c_chksum 8 bytes Checksum of data field if c_magic is 070702;
+ otherwise zero
+============= ================== ==============================================
+
+The c_mode field matches the contents of st_mode returned by stat(2)
+on Linux, and encodes the file type and file permissions.
+
+The c_filesize should be zero for any file which is not a regular file
+or symlink.
+
+The c_chksum field contains a simple 32-bit unsigned sum of all the
+bytes in the data field. cpio(1) refers to this as "crc", which is
+clearly incorrect (a cyclic redundancy check is a different and
+significantly stronger integrity check), however, this is the
+algorithm used.
+
+If the filename is "TRAILER!!!" this is actually an end-of-archive
+marker; the c_filesize for an end-of-archive marker must be zero.
+
+
+Handling of hard links
+======================
+
+When a nondirectory with c_nlink > 1 is seen, the (c_maj,c_min,c_ino)
+tuple is looked up in a tuple buffer. If not found, it is entered in
+the tuple buffer and the entry is created as usual; if found, a hard
+link rather than a second copy of the file is created. It is not
+necessary (but permitted) to include a second copy of the file
+contents; if the file contents is not included, the c_filesize field
+should be set to zero to indicate no data section follows. If data is
+present, the previous instance of the file is overwritten; this allows
+the data-carrying instance of a file to occur anywhere in the sequence
+(GNU cpio is reported to attach the data to the last instance of a
+file only.)
+
+c_filesize must not be zero for a symlink.
+
+When a "TRAILER!!!" end-of-archive marker is seen, the tuple buffer is
+reset. This permits archives which are generated independently to be
+concatenated.
+
+To combine file data from different sources (without having to
+regenerate the (c_maj,c_min,c_ino) fields), therefore, either one of
+the following techniques can be used:
+
+a) Separate the different file data sources with a "TRAILER!!!"
+ end-of-archive marker, or
+
+b) Make sure c_nlink == 1 for all nondirectory entries.
diff --git a/Documentation/driver-api/early-userspace/early_userspace_support.rst b/Documentation/driver-api/early-userspace/early_userspace_support.rst
new file mode 100644
index 0000000000..61bdeac1ba
--- /dev/null
+++ b/Documentation/driver-api/early-userspace/early_userspace_support.rst
@@ -0,0 +1,154 @@
+=======================
+Early userspace support
+=======================
+
+Last update: 2004-12-20 tlh
+
+
+"Early userspace" is a set of libraries and programs that provide
+various pieces of functionality that are important enough to be
+available while a Linux kernel is coming up, but that don't need to be
+run inside the kernel itself.
+
+It consists of several major infrastructure components:
+
+- gen_init_cpio, a program that builds a cpio-format archive
+ containing a root filesystem image. This archive is compressed, and
+ the compressed image is linked into the kernel image.
+- initramfs, a chunk of code that unpacks the compressed cpio image
+ midway through the kernel boot process.
+- klibc, a userspace C library, currently packaged separately, that is
+ optimized for correctness and small size.
+
+The cpio file format used by initramfs is the "newc" (aka "cpio -H newc")
+format, and is documented in the file "buffer-format.txt". There are
+two ways to add an early userspace image: specify an existing cpio
+archive to be used as the image or have the kernel build process build
+the image from specifications.
+
+CPIO ARCHIVE method
+-------------------
+
+You can create a cpio archive that contains the early userspace image.
+Your cpio archive should be specified in CONFIG_INITRAMFS_SOURCE and it
+will be used directly. Only a single cpio file may be specified in
+CONFIG_INITRAMFS_SOURCE and directory and file names are not allowed in
+combination with a cpio archive.
+
+IMAGE BUILDING method
+---------------------
+
+The kernel build process can also build an early userspace image from
+source parts rather than supplying a cpio archive. This method provides
+a way to create images with root-owned files even though the image was
+built by an unprivileged user.
+
+The image is specified as one or more sources in
+CONFIG_INITRAMFS_SOURCE. Sources can be either directories or files -
+cpio archives are *not* allowed when building from sources.
+
+A source directory will have it and all of its contents packaged. The
+specified directory name will be mapped to '/'. When packaging a
+directory, limited user and group ID translation can be performed.
+INITRAMFS_ROOT_UID can be set to a user ID that needs to be mapped to
+user root (0). INITRAMFS_ROOT_GID can be set to a group ID that needs
+to be mapped to group root (0).
+
+A source file must be directives in the format required by the
+usr/gen_init_cpio utility (run 'usr/gen_init_cpio -h' to get the
+file format). The directives in the file will be passed directly to
+usr/gen_init_cpio.
+
+When a combination of directories and files are specified then the
+initramfs image will be an aggregate of all of them. In this way a user
+can create a 'root-image' directory and install all files into it.
+Because device-special files cannot be created by a unprivileged user,
+special files can be listed in a 'root-files' file. Both 'root-image'
+and 'root-files' can be listed in CONFIG_INITRAMFS_SOURCE and a complete
+early userspace image can be built by an unprivileged user.
+
+As a technical note, when directories and files are specified, the
+entire CONFIG_INITRAMFS_SOURCE is passed to
+usr/gen_initramfs.sh. This means that CONFIG_INITRAMFS_SOURCE
+can really be interpreted as any legal argument to
+gen_initramfs.sh. If a directory is specified as an argument then
+the contents are scanned, uid/gid translation is performed, and
+usr/gen_init_cpio file directives are output. If a directory is
+specified as an argument to usr/gen_initramfs.sh then the
+contents of the file are simply copied to the output. All of the output
+directives from directory scanning and file contents copying are
+processed by usr/gen_init_cpio.
+
+See also 'usr/gen_initramfs.sh -h'.
+
+Where's this all leading?
+=========================
+
+The klibc distribution contains some of the necessary software to make
+early userspace useful. The klibc distribution is currently
+maintained separately from the kernel.
+
+You can obtain somewhat infrequent snapshots of klibc from
+https://www.kernel.org/pub/linux/libs/klibc/
+
+For active users, you are better off using the klibc git
+repository, at https://git.kernel.org/?p=libs/klibc/klibc.git
+
+The standalone klibc distribution currently provides three components,
+in addition to the klibc library:
+
+- ipconfig, a program that configures network interfaces. It can
+ configure them statically, or use DHCP to obtain information
+ dynamically (aka "IP autoconfiguration").
+- nfsmount, a program that can mount an NFS filesystem.
+- kinit, the "glue" that uses ipconfig and nfsmount to replace the old
+ support for IP autoconfig, mount a filesystem over NFS, and continue
+ system boot using that filesystem as root.
+
+kinit is built as a single statically linked binary to save space.
+
+Eventually, several more chunks of kernel functionality will hopefully
+move to early userspace:
+
+- Almost all of init/do_mounts* (the beginning of this is already in
+ place)
+- ACPI table parsing
+- Insert unwieldy subsystem that doesn't really need to be in kernel
+ space here
+
+If kinit doesn't meet your current needs and you've got bytes to burn,
+the klibc distribution includes a small Bourne-compatible shell (ash)
+and a number of other utilities, so you can replace kinit and build
+custom initramfs images that meet your needs exactly.
+
+For questions and help, you can sign up for the early userspace
+mailing list at https://www.zytor.com/mailman/listinfo/klibc
+
+How does it work?
+=================
+
+The kernel has currently 3 ways to mount the root filesystem:
+
+a) all required device and filesystem drivers compiled into the kernel, no
+ initrd. init/main.c:init() will call prepare_namespace() to mount the
+ final root filesystem, based on the root= option and optional init= to run
+ some other init binary than listed at the end of init/main.c:init().
+
+b) some device and filesystem drivers built as modules and stored in an
+ initrd. The initrd must contain a binary '/linuxrc' which is supposed to
+ load these driver modules. It is also possible to mount the final root
+ filesystem via linuxrc and use the pivot_root syscall. The initrd is
+ mounted and executed via prepare_namespace().
+
+c) using initramfs. The call to prepare_namespace() must be skipped.
+ This means that a binary must do all the work. Said binary can be stored
+ into initramfs either via modifying usr/gen_init_cpio.c or via the new
+ initrd format, an cpio archive. It must be called "/init". This binary
+ is responsible to do all the things prepare_namespace() would do.
+
+ To maintain backwards compatibility, the /init binary will only run if it
+ comes via an initramfs cpio archive. If this is not the case,
+ init/main.c:init() will run prepare_namespace() to mount the final root
+ and exec one of the predefined init binaries.
+
+Bryan O'Sullivan <bos@serpentine.com>
diff --git a/Documentation/driver-api/early-userspace/index.rst b/Documentation/driver-api/early-userspace/index.rst
new file mode 100644
index 0000000000..149c1822f0
--- /dev/null
+++ b/Documentation/driver-api/early-userspace/index.rst
@@ -0,0 +1,18 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============
+Early Userspace
+===============
+
+.. toctree::
+ :maxdepth: 1
+
+ early_userspace_support
+ buffer-format
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/edac.rst b/Documentation/driver-api/edac.rst
new file mode 100644
index 0000000000..f4f044b95c
--- /dev/null
+++ b/Documentation/driver-api/edac.rst
@@ -0,0 +1,298 @@
+Error Detection And Correction (EDAC) Devices
+=============================================
+
+Main Concepts used at the EDAC subsystem
+----------------------------------------
+
+There are several things to be aware of that aren't at all obvious, like
+*sockets, *socket sets*, *banks*, *rows*, *chip-select rows*, *channels*,
+etc...
+
+These are some of the many terms that are thrown about that don't always
+mean what people think they mean (Inconceivable!). In the interest of
+creating a common ground for discussion, terms and their definitions
+will be established.
+
+* Memory devices
+
+The individual DRAM chips on a memory stick. These devices commonly
+output 4 and 8 bits each (x4, x8). Grouping several of these in parallel
+provides the number of bits that the memory controller expects:
+typically 72 bits, in order to provide 64 bits + 8 bits of ECC data.
+
+* Memory Stick
+
+A printed circuit board that aggregates multiple memory devices in
+parallel. In general, this is the Field Replaceable Unit (FRU) which
+gets replaced, in the case of excessive errors. Most often it is also
+called DIMM (Dual Inline Memory Module).
+
+* Memory Socket
+
+A physical connector on the motherboard that accepts a single memory
+stick. Also called as "slot" on several datasheets.
+
+* Channel
+
+A memory controller channel, responsible to communicate with a group of
+DIMMs. Each channel has its own independent control (command) and data
+bus, and can be used independently or grouped with other channels.
+
+* Branch
+
+It is typically the highest hierarchy on a Fully-Buffered DIMM memory
+controller. Typically, it contains two channels. Two channels at the
+same branch can be used in single mode or in lockstep mode. When
+lockstep is enabled, the cacheline is doubled, but it generally brings
+some performance penalty. Also, it is generally not possible to point to
+just one memory stick when an error occurs, as the error correction code
+is calculated using two DIMMs instead of one. Due to that, it is capable
+of correcting more errors than on single mode.
+
+* Single-channel
+
+The data accessed by the memory controller is contained into one dimm
+only. E. g. if the data is 64 bits-wide, the data flows to the CPU using
+one 64 bits parallel access. Typically used with SDR, DDR, DDR2 and DDR3
+memories. FB-DIMM and RAMBUS use a different concept for channel, so
+this concept doesn't apply there.
+
+* Double-channel
+
+The data size accessed by the memory controller is interlaced into two
+dimms, accessed at the same time. E. g. if the DIMM is 64 bits-wide (72
+bits with ECC), the data flows to the CPU using a 128 bits parallel
+access.
+
+* Chip-select row
+
+This is the name of the DRAM signal used to select the DRAM ranks to be
+accessed. Common chip-select rows for single channel are 64 bits, for
+dual channel 128 bits. It may not be visible by the memory controller,
+as some DIMM types have a memory buffer that can hide direct access to
+it from the Memory Controller.
+
+* Single-Ranked stick
+
+A Single-ranked stick has 1 chip-select row of memory. Motherboards
+commonly drive two chip-select pins to a memory stick. A single-ranked
+stick, will occupy only one of those rows. The other will be unused.
+
+.. _doubleranked:
+
+* Double-Ranked stick
+
+A double-ranked stick has two chip-select rows which access different
+sets of memory devices. The two rows cannot be accessed concurrently.
+
+* Double-sided stick
+
+**DEPRECATED TERM**, see :ref:`Double-Ranked stick <doubleranked>`.
+
+A double-sided stick has two chip-select rows which access different sets
+of memory devices. The two rows cannot be accessed concurrently.
+"Double-sided" is irrespective of the memory devices being mounted on
+both sides of the memory stick.
+
+* Socket set
+
+All of the memory sticks that are required for a single memory access or
+all of the memory sticks spanned by a chip-select row. A single socket
+set has two chip-select rows and if double-sided sticks are used these
+will occupy those chip-select rows.
+
+* Bank
+
+This term is avoided because it is unclear when needing to distinguish
+between chip-select rows and socket sets.
+
+* High Bandwidth Memory (HBM)
+
+HBM is a new memory type with low power consumption and ultra-wide
+communication lanes. It uses vertically stacked memory chips (DRAM dies)
+interconnected by microscopic wires called "through-silicon vias," or
+TSVs.
+
+Several stacks of HBM chips connect to the CPU or GPU through an ultra-fast
+interconnect called the "interposer". Therefore, HBM's characteristics
+are nearly indistinguishable from on-chip integrated RAM.
+
+Memory Controllers
+------------------
+
+Most of the EDAC core is focused on doing Memory Controller error detection.
+The :c:func:`edac_mc_alloc`. It uses internally the struct ``mem_ctl_info``
+to describe the memory controllers, with is an opaque struct for the EDAC
+drivers. Only the EDAC core is allowed to touch it.
+
+.. kernel-doc:: include/linux/edac.h
+
+.. kernel-doc:: drivers/edac/edac_mc.h
+
+PCI Controllers
+---------------
+
+The EDAC subsystem provides a mechanism to handle PCI controllers by calling
+the :c:func:`edac_pci_alloc_ctl_info`. It will use the struct
+:c:type:`edac_pci_ctl_info` to describe the PCI controllers.
+
+.. kernel-doc:: drivers/edac/edac_pci.h
+
+EDAC Blocks
+-----------
+
+The EDAC subsystem also provides a generic mechanism to report errors on
+other parts of the hardware via :c:func:`edac_device_alloc_ctl_info` function.
+
+The structures :c:type:`edac_dev_sysfs_block_attribute`,
+:c:type:`edac_device_block`, :c:type:`edac_device_instance` and
+:c:type:`edac_device_ctl_info` provide a generic or abstract 'edac_device'
+representation at sysfs.
+
+This set of structures and the code that implements the APIs for the same, provide for registering EDAC type devices which are NOT standard memory or
+PCI, like:
+
+- CPU caches (L1 and L2)
+- DMA engines
+- Core CPU switches
+- Fabric switch units
+- PCIe interface controllers
+- other EDAC/ECC type devices that can be monitored for
+ errors, etc.
+
+It allows for a 2 level set of hierarchy.
+
+For example, a cache could be composed of L1, L2 and L3 levels of cache.
+Each CPU core would have its own L1 cache, while sharing L2 and maybe L3
+caches. On such case, those can be represented via the following sysfs
+nodes::
+
+ /sys/devices/system/edac/..
+
+ pci/ <existing pci directory (if available)>
+ mc/ <existing memory device directory>
+ cpu/cpu0/.. <L1 and L2 block directory>
+ /L1-cache/ce_count
+ /ue_count
+ /L2-cache/ce_count
+ /ue_count
+ cpu/cpu1/.. <L1 and L2 block directory>
+ /L1-cache/ce_count
+ /ue_count
+ /L2-cache/ce_count
+ /ue_count
+ ...
+
+ the L1 and L2 directories would be "edac_device_block's"
+
+.. kernel-doc:: drivers/edac/edac_device.h
+
+
+Heterogeneous system support
+----------------------------
+
+An AMD heterogeneous system is built by connecting the data fabrics of
+both CPUs and GPUs via custom xGMI links. Thus, the data fabric on the
+GPU nodes can be accessed the same way as the data fabric on CPU nodes.
+
+The MI200 accelerators are data center GPUs. They have 2 data fabrics,
+and each GPU data fabric contains four Unified Memory Controllers (UMC).
+Each UMC contains eight channels. Each UMC channel controls one 128-bit
+HBM2e (2GB) channel (equivalent to 8 X 2GB ranks). This creates a total
+of 4096-bits of DRAM data bus.
+
+While the UMC is interfacing a 16GB (8high X 2GB DRAM) HBM stack, each UMC
+channel is interfacing 2GB of DRAM (represented as rank).
+
+Memory controllers on AMD GPU nodes can be represented in EDAC thusly:
+
+ GPU DF / GPU Node -> EDAC MC
+ GPU UMC -> EDAC CSROW
+ GPU UMC channel -> EDAC CHANNEL
+
+For example: a heterogeneous system with 1 AMD CPU is connected to
+4 MI200 (Aldebaran) GPUs using xGMI.
+
+Some more heterogeneous hardware details:
+
+- The CPU UMC (Unified Memory Controller) is mostly the same as the GPU UMC.
+ They have chip selects (csrows) and channels. However, the layouts are different
+ for performance, physical layout, or other reasons.
+- CPU UMCs use 1 channel, In this case UMC = EDAC channel. This follows the
+ marketing speak. CPU has X memory channels, etc.
+- CPU UMCs use up to 4 chip selects, So UMC chip select = EDAC CSROW.
+- GPU UMCs use 1 chip select, So UMC = EDAC CSROW.
+- GPU UMCs use 8 channels, So UMC channel = EDAC channel.
+
+The EDAC subsystem provides a mechanism to handle AMD heterogeneous
+systems by calling system specific ops for both CPUs and GPUs.
+
+AMD GPU nodes are enumerated in sequential order based on the PCI
+hierarchy, and the first GPU node is assumed to have a Node ID value
+following those of the CPU nodes after latter are fully populated::
+
+ $ ls /sys/devices/system/edac/mc/
+ mc0 - CPU MC node 0
+ mc1 |
+ mc2 |- GPU card[0] => node 0(mc1), node 1(mc2)
+ mc3 |
+ mc4 |- GPU card[1] => node 0(mc3), node 1(mc4)
+ mc5 |
+ mc6 |- GPU card[2] => node 0(mc5), node 1(mc6)
+ mc7 |
+ mc8 |- GPU card[3] => node 0(mc7), node 1(mc8)
+
+For example, a heterogeneous system with one AMD CPU is connected to
+four MI200 (Aldebaran) GPUs using xGMI. This topology can be represented
+via the following sysfs entries::
+
+ /sys/devices/system/edac/mc/..
+
+ CPU # CPU node
+ ├── mc 0
+
+ GPU Nodes are enumerated sequentially after CPU nodes have been populated
+ GPU card 1 # Each MI200 GPU has 2 nodes/mcs
+ ├── mc 1 # GPU node 0 == mc1, Each MC node has 4 UMCs/CSROWs
+ │   ├── csrow 0 # UMC 0
+ │   │   ├── channel 0 # Each UMC has 8 channels
+ │   │   ├── channel 1 # size of each channel is 2 GB, so each UMC has 16 GB
+ │   │   ├── channel 2
+ │   │   ├── channel 3
+ │   │   ├── channel 4
+ │   │   ├── channel 5
+ │   │   ├── channel 6
+ │   │   ├── channel 7
+ │   ├── csrow 1 # UMC 1
+ │   │   ├── channel 0
+ │   │   ├── ..
+ │   │   ├── channel 7
+ │   ├── .. ..
+ │   ├── csrow 3 # UMC 3
+ │   │   ├── channel 0
+ │   │   ├── ..
+ │   │   ├── channel 7
+ │   ├── rank 0
+ │   ├── .. ..
+ │   ├── rank 31 # total 32 ranks/dimms from 4 UMCs
+ ├
+ ├── mc 2 # GPU node 1 == mc2
+ │   ├── .. # each GPU has total 64 GB
+
+ GPU card 2
+ ├── mc 3
+ │   ├── ..
+ ├── mc 4
+ │   ├── ..
+
+ GPU card 3
+ ├── mc 5
+ │   ├── ..
+ ├── mc 6
+ │   ├── ..
+
+ GPU card 4
+ ├── mc 7
+ │   ├── ..
+ ├── mc 8
+ │   ├── ..
diff --git a/Documentation/driver-api/eisa.rst b/Documentation/driver-api/eisa.rst
new file mode 100644
index 0000000000..3eac11b7eb
--- /dev/null
+++ b/Documentation/driver-api/eisa.rst
@@ -0,0 +1,230 @@
+================
+EISA bus support
+================
+
+:Author: Marc Zyngier <maz@wild-wind.fr.eu.org>
+
+This document groups random notes about porting EISA drivers to the
+new EISA/sysfs API.
+
+Starting from version 2.5.59, the EISA bus is almost given the same
+status as other much more mainstream busses such as PCI or USB. This
+has been possible through sysfs, which defines a nice enough set of
+abstractions to manage busses, devices and drivers.
+
+Although the new API is quite simple to use, converting existing
+drivers to the new infrastructure is not an easy task (mostly because
+detection code is generally also used to probe ISA cards). Moreover,
+most EISA drivers are among the oldest Linux drivers so, as you can
+imagine, some dust has settled here over the years.
+
+The EISA infrastructure is made up of three parts:
+
+ - The bus code implements most of the generic code. It is shared
+ among all the architectures that the EISA code runs on. It
+ implements bus probing (detecting EISA cards available on the bus),
+ allocates I/O resources, allows fancy naming through sysfs, and
+ offers interfaces for driver to register.
+
+ - The bus root driver implements the glue between the bus hardware
+ and the generic bus code. It is responsible for discovering the
+ device implementing the bus, and setting it up to be latter probed
+ by the bus code. This can go from something as simple as reserving
+ an I/O region on x86, to the rather more complex, like the hppa
+ EISA code. This is the part to implement in order to have EISA
+ running on an "new" platform.
+
+ - The driver offers the bus a list of devices that it manages, and
+ implements the necessary callbacks to probe and release devices
+ whenever told to.
+
+Every function/structure below lives in <linux/eisa.h>, which depends
+heavily on <linux/device.h>.
+
+Bus root driver
+===============
+
+::
+
+ int eisa_root_register (struct eisa_root_device *root);
+
+The eisa_root_register function is used to declare a device as the
+root of an EISA bus. The eisa_root_device structure holds a reference
+to this device, as well as some parameters for probing purposes::
+
+ struct eisa_root_device {
+ struct device *dev; /* Pointer to bridge device */
+ struct resource *res;
+ unsigned long bus_base_addr;
+ int slots; /* Max slot number */
+ int force_probe; /* Probe even when no slot 0 */
+ u64 dma_mask; /* from bridge device */
+ int bus_nr; /* Set by eisa_root_register */
+ struct resource eisa_root_res; /* ditto */
+ };
+
+============= ======================================================
+node used for eisa_root_register internal purpose
+dev pointer to the root device
+res root device I/O resource
+bus_base_addr slot 0 address on this bus
+slots max slot number to probe
+force_probe Probe even when slot 0 is empty (no EISA mainboard)
+dma_mask Default DMA mask. Usually the bridge device dma_mask.
+bus_nr unique bus id, set by eisa_root_register
+============= ======================================================
+
+Driver
+======
+
+::
+
+ int eisa_driver_register (struct eisa_driver *edrv);
+ void eisa_driver_unregister (struct eisa_driver *edrv);
+
+Clear enough ?
+
+::
+
+ struct eisa_device_id {
+ char sig[EISA_SIG_LEN];
+ unsigned long driver_data;
+ };
+
+ struct eisa_driver {
+ const struct eisa_device_id *id_table;
+ struct device_driver driver;
+ };
+
+=============== ====================================================
+id_table an array of NULL terminated EISA id strings,
+ followed by an empty string. Each string can
+ optionally be paired with a driver-dependent value
+ (driver_data).
+
+driver a generic driver, such as described in
+ Documentation/driver-api/driver-model/driver.rst. Only .name,
+ .probe and .remove members are mandatory.
+=============== ====================================================
+
+An example is the 3c59x driver::
+
+ static struct eisa_device_id vortex_eisa_ids[] = {
+ { "TCM5920", EISA_3C592_OFFSET },
+ { "TCM5970", EISA_3C597_OFFSET },
+ { "" }
+ };
+
+ static struct eisa_driver vortex_eisa_driver = {
+ .id_table = vortex_eisa_ids,
+ .driver = {
+ .name = "3c59x",
+ .probe = vortex_eisa_probe,
+ .remove = vortex_eisa_remove
+ }
+ };
+
+Device
+======
+
+The sysfs framework calls .probe and .remove functions upon device
+discovery and removal (note that the .remove function is only called
+when driver is built as a module).
+
+Both functions are passed a pointer to a 'struct device', which is
+encapsulated in a 'struct eisa_device' described as follows::
+
+ struct eisa_device {
+ struct eisa_device_id id;
+ int slot;
+ int state;
+ unsigned long base_addr;
+ struct resource res[EISA_MAX_RESOURCES];
+ u64 dma_mask;
+ struct device dev; /* generic device */
+ };
+
+======== ============================================================
+id EISA id, as read from device. id.driver_data is set from the
+ matching driver EISA id.
+slot slot number which the device was detected on
+state set of flags indicating the state of the device. Current
+ flags are EISA_CONFIG_ENABLED and EISA_CONFIG_FORCED.
+res set of four 256 bytes I/O regions allocated to this device
+dma_mask DMA mask set from the parent device.
+dev generic device (see Documentation/driver-api/driver-model/device.rst)
+======== ============================================================
+
+You can get the 'struct eisa_device' from 'struct device' using the
+'to_eisa_device' macro.
+
+Misc stuff
+==========
+
+::
+
+ void eisa_set_drvdata (struct eisa_device *edev, void *data);
+
+Stores data into the device's driver_data area.
+
+::
+
+ void *eisa_get_drvdata (struct eisa_device *edev):
+
+Gets the pointer previously stored into the device's driver_data area.
+
+::
+
+ int eisa_get_region_index (void *addr);
+
+Returns the region number (0 <= x < EISA_MAX_RESOURCES) of a given
+address.
+
+Kernel parameters
+=================
+
+eisa_bus.enable_dev
+ A comma-separated list of slots to be enabled, even if the firmware
+ set the card as disabled. The driver must be able to properly
+ initialize the device in such conditions.
+
+eisa_bus.disable_dev
+ A comma-separated list of slots to be disabled, even if the firmware
+ set the card as enabled. The driver won't be called to handle this
+ device.
+
+virtual_root.force_probe
+ Force the probing code to probe EISA slots even when it cannot find an
+ EISA compliant mainboard (nothing appears on slot 0). Defaults to 0
+ (don't force), and set to 1 (force probing) when either
+ CONFIG_ALPHA_JENSEN or CONFIG_EISA_VLB_PRIMING are set.
+
+Random notes
+============
+
+Converting an EISA driver to the new API mostly involves *deleting*
+code (since probing is now in the core EISA code). Unfortunately, most
+drivers share their probing routine between ISA, and EISA. Special
+care must be taken when ripping out the EISA code, so other busses
+won't suffer from these surgical strikes...
+
+You *must not* expect any EISA device to be detected when returning
+from eisa_driver_register, since the chances are that the bus has not
+yet been probed. In fact, that's what happens most of the time (the
+bus root driver usually kicks in rather late in the boot process).
+Unfortunately, most drivers are doing the probing by themselves, and
+expect to have explored the whole machine when they exit their probe
+routine.
+
+For example, switching your favorite EISA SCSI card to the "hotplug"
+model is "the right thing"(tm).
+
+Thanks
+======
+
+I'd like to thank the following people for their help:
+
+- Xavier Benigni for lending me a wonderful Alpha Jensen,
+- James Bottomley, Jeff Garzik for getting this stuff into the kernel,
+- Andries Brouwer for contributing numerous EISA ids,
+- Catrin Jones for coping with far too many machines at home.
diff --git a/Documentation/driver-api/firewire.rst b/Documentation/driver-api/firewire.rst
new file mode 100644
index 0000000000..d3cfa73cbb
--- /dev/null
+++ b/Documentation/driver-api/firewire.rst
@@ -0,0 +1,48 @@
+===========================================
+Firewire (IEEE 1394) driver Interface Guide
+===========================================
+
+Introduction and Overview
+=========================
+
+The Linux FireWire subsystem adds some interfaces into the Linux system to
+ use/maintain+any resource on IEEE 1394 bus.
+
+The main purpose of these interfaces is to access address space on each node
+on IEEE 1394 bus by ISO/IEC 13213 (IEEE 1212) procedure, and to control
+isochronous resources on the bus by IEEE 1394 procedure.
+
+Two types of interfaces are added, according to consumers of the interface. A
+set of userspace interfaces is available via `firewire character devices`. A set
+of kernel interfaces is available via exported symbols in `firewire-core` module.
+
+Firewire char device data structures
+====================================
+
+.. include:: ../ABI/stable/firewire-cdev
+ :literal:
+
+.. kernel-doc:: include/uapi/linux/firewire-cdev.h
+ :internal:
+
+Firewire device probing and sysfs interfaces
+============================================
+
+.. include:: ../ABI/stable/sysfs-bus-firewire
+ :literal:
+
+.. kernel-doc:: drivers/firewire/core-device.c
+ :export:
+
+Firewire core transaction interfaces
+====================================
+
+.. kernel-doc:: drivers/firewire/core-transaction.c
+ :export:
+
+Firewire Isochronous I/O interfaces
+===================================
+
+.. kernel-doc:: drivers/firewire/core-iso.c
+ :export:
+
diff --git a/Documentation/driver-api/firmware/built-in-fw.rst b/Documentation/driver-api/firmware/built-in-fw.rst
new file mode 100644
index 0000000000..bc1c961bac
--- /dev/null
+++ b/Documentation/driver-api/firmware/built-in-fw.rst
@@ -0,0 +1,33 @@
+=================
+Built-in firmware
+=================
+
+Firmware can be built-in to the kernel, this means building the firmware
+into vmlinux directly, to enable avoiding having to look for firmware from
+the filesystem. Instead, firmware can be looked for inside the kernel
+directly. You can enable built-in firmware using the kernel configuration
+options:
+
+ * CONFIG_EXTRA_FIRMWARE
+ * CONFIG_EXTRA_FIRMWARE_DIR
+
+There are a few reasons why you might want to consider building your firmware
+into the kernel with CONFIG_EXTRA_FIRMWARE:
+
+* Speed
+* Firmware is needed for accessing the boot device, and the user doesn't
+ want to stuff the firmware into the boot initramfs.
+
+Even if you have these needs there are a few reasons why you may not be
+able to make use of built-in firmware:
+
+* Legalese - firmware is non-GPL compatible
+* Some firmware may be optional
+* Firmware upgrades are possible, therefore a new firmware would implicate
+ a complete kernel rebuild.
+* Some firmware files may be really large in size. The remote-proc subsystem
+ is an example subsystem which deals with these sorts of firmware
+* The firmware may need to be scraped out from some device specific location
+ dynamically, an example is calibration data for some WiFi chipsets. This
+ calibration data can be unique per sold device.
+
diff --git a/Documentation/driver-api/firmware/core.rst b/Documentation/driver-api/firmware/core.rst
new file mode 100644
index 0000000000..803cd574bb
--- /dev/null
+++ b/Documentation/driver-api/firmware/core.rst
@@ -0,0 +1,17 @@
+==========================
+Firmware API core features
+==========================
+
+The firmware API has a rich set of core features available. This section
+documents these features.
+
+.. toctree::
+
+ fw_search_path
+ built-in-fw
+ firmware_cache
+ direct-fs-lookup
+ fallback-mechanisms
+ lookup-order
+ firmware-usage-guidelines
+
diff --git a/Documentation/driver-api/firmware/direct-fs-lookup.rst b/Documentation/driver-api/firmware/direct-fs-lookup.rst
new file mode 100644
index 0000000000..e04353d1b0
--- /dev/null
+++ b/Documentation/driver-api/firmware/direct-fs-lookup.rst
@@ -0,0 +1,30 @@
+========================
+Direct filesystem lookup
+========================
+
+Direct filesystem lookup is the most common form of firmware lookup performed
+by the kernel. The kernel looks for the firmware directly on the root
+filesystem in the paths documented in the section 'Firmware search paths'.
+The filesystem lookup is implemented in fw_get_filesystem_firmware(), it
+uses common core kernel file loader facility kernel_read_file_from_path().
+The max path allowed is PATH_MAX -- currently this is 4096 characters.
+
+It is recommended you keep /lib/firmware paths on your root filesystem,
+avoid having a separate partition for them in order to avoid possible
+races with lookups and avoid uses of the custom fallback mechanisms
+documented below.
+
+Firmware and initramfs
+----------------------
+
+Drivers which are built-in to the kernel should have the firmware integrated
+also as part of the initramfs used to boot the kernel given that otherwise
+a race is possible with loading the driver and the real rootfs not yet being
+available. Stuffing the firmware into initramfs resolves this race issue,
+however note that using initrd does not suffice to address the same race.
+
+There are circumstances that justify not wanting to include firmware into
+initramfs, such as dealing with large firmware files for the
+remote-proc subsystem. For such cases using a userspace fallback mechanism
+is currently the only viable solution as only userspace can know for sure
+when the real rootfs is ready and mounted.
diff --git a/Documentation/driver-api/firmware/efi/index.rst b/Documentation/driver-api/firmware/efi/index.rst
new file mode 100644
index 0000000000..4fe8abba9f
--- /dev/null
+++ b/Documentation/driver-api/firmware/efi/index.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+============
+UEFI Support
+============
+
+UEFI stub library functions
+===========================
+
+.. kernel-doc:: drivers/firmware/efi/libstub/mem.c
+ :internal:
diff --git a/Documentation/driver-api/firmware/fallback-mechanisms.rst b/Documentation/driver-api/firmware/fallback-mechanisms.rst
new file mode 100644
index 0000000000..5f04c3bcdf
--- /dev/null
+++ b/Documentation/driver-api/firmware/fallback-mechanisms.rst
@@ -0,0 +1,308 @@
+===================
+Fallback mechanisms
+===================
+
+A fallback mechanism is supported to allow to overcome failures to do a direct
+filesystem lookup on the root filesystem or when the firmware simply cannot be
+installed for practical reasons on the root filesystem. The kernel
+configuration options related to supporting the firmware fallback mechanism are:
+
+ * CONFIG_FW_LOADER_USER_HELPER: enables building the firmware fallback
+ mechanism. Most distributions enable this option today. If enabled but
+ CONFIG_FW_LOADER_USER_HELPER_FALLBACK is disabled, only the custom fallback
+ mechanism is available and for the request_firmware_nowait() call.
+ * CONFIG_FW_LOADER_USER_HELPER_FALLBACK: force enables each request to
+ enable the kobject uevent fallback mechanism on all firmware API calls
+ except request_firmware_direct(). Most distributions disable this option
+ today. The call request_firmware_nowait() allows for one alternative
+ fallback mechanism: if this kconfig option is enabled and your second
+ argument to request_firmware_nowait(), uevent, is set to false you are
+ informing the kernel that you have a custom fallback mechanism and it will
+ manually load the firmware. Read below for more details.
+
+Note that this means when having this configuration:
+
+CONFIG_FW_LOADER_USER_HELPER=y
+CONFIG_FW_LOADER_USER_HELPER_FALLBACK=n
+
+the kobject uevent fallback mechanism will never take effect even
+for request_firmware_nowait() when uevent is set to true.
+
+Justifying the firmware fallback mechanism
+==========================================
+
+Direct filesystem lookups may fail for a variety of reasons. Known reasons for
+this are worth itemizing and documenting as it justifies the need for the
+fallback mechanism:
+
+* Race against access with the root filesystem upon bootup.
+
+* Races upon resume from suspend. This is resolved by the firmware cache, but
+ the firmware cache is only supported if you use uevents, and its not
+ supported for request_firmware_into_buf().
+
+* Firmware is not accessible through typical means:
+
+ * It cannot be installed into the root filesystem
+ * The firmware provides very unique device specific data tailored for
+ the unit gathered with local information. An example is calibration
+ data for WiFi chipsets for mobile devices. This calibration data is
+ not common to all units, but tailored per unit. Such information may
+ be installed on a separate flash partition other than where the root
+ filesystem is provided.
+
+Types of fallback mechanisms
+============================
+
+There are really two fallback mechanisms available using one shared sysfs
+interface as a loading facility:
+
+* Kobject uevent fallback mechanism
+* Custom fallback mechanism
+
+First lets document the shared sysfs loading facility.
+
+Firmware sysfs loading facility
+===============================
+
+In order to help device drivers upload firmware using a fallback mechanism
+the firmware infrastructure creates a sysfs interface to enable userspace
+to load and indicate when firmware is ready. The sysfs directory is created
+via fw_create_instance(). This call creates a new struct device named after
+the firmware requested, and establishes it in the device hierarchy by
+associating the device used to make the request as the device's parent.
+The sysfs directory's file attributes are defined and controlled through
+the new device's class (firmware_class) and group (fw_dev_attr_groups).
+This is actually where the original firmware_class module name came from,
+given that originally the only firmware loading mechanism available was the
+mechanism we now use as a fallback mechanism, which registers a struct class
+firmware_class. Because the attributes exposed are part of the module name, the
+module name firmware_class cannot be renamed in the future, to ensure backward
+compatibility with old userspace.
+
+To load firmware using the sysfs interface we expose a loading indicator,
+and a file upload firmware into:
+
+ * /sys/$DEVPATH/loading
+ * /sys/$DEVPATH/data
+
+To upload firmware you will echo 1 onto the loading file to indicate
+you are loading firmware. You then write the firmware into the data file,
+and you notify the kernel the firmware is ready by echo'ing 0 onto
+the loading file.
+
+The firmware device used to help load firmware using sysfs is only created if
+direct firmware loading fails and if the fallback mechanism is enabled for your
+firmware request, this is set up with :c:func:`firmware_fallback_sysfs`. It is
+important to re-iterate that no device is created if a direct filesystem lookup
+succeeded.
+
+Using::
+
+ echo 1 > /sys/$DEVPATH/loading
+
+Will clean any previous partial load at once and make the firmware API
+return an error. When loading firmware the firmware_class grows a buffer
+for the firmware in PAGE_SIZE increments to hold the image as it comes in.
+
+firmware_data_read() and firmware_loading_show() are just provided for the
+test_firmware driver for testing, they are not called in normal use or
+expected to be used regularly by userspace.
+
+firmware_fallback_sysfs
+-----------------------
+.. kernel-doc:: drivers/base/firmware_loader/fallback.c
+ :functions: firmware_fallback_sysfs
+
+Firmware kobject uevent fallback mechanism
+==========================================
+
+Since a device is created for the sysfs interface to help load firmware as a
+fallback mechanism userspace can be informed of the addition of the device by
+relying on kobject uevents. The addition of the device into the device
+hierarchy means the fallback mechanism for firmware loading has been initiated.
+For details of implementation refer to fw_load_sysfs_fallback(), in particular
+on the use of dev_set_uevent_suppress() and kobject_uevent().
+
+The kernel's kobject uevent mechanism is implemented in lib/kobject_uevent.c,
+it issues uevents to userspace. As a supplement to kobject uevents Linux
+distributions could also enable CONFIG_UEVENT_HELPER_PATH, which makes use of
+core kernel's usermode helper (UMH) functionality to call out to a userspace
+helper for kobject uevents. In practice though no standard distribution has
+ever used the CONFIG_UEVENT_HELPER_PATH. If CONFIG_UEVENT_HELPER_PATH is
+enabled this binary would be called each time kobject_uevent_env() gets called
+in the kernel for each kobject uevent triggered.
+
+Different implementations have been supported in userspace to take advantage of
+this fallback mechanism. When firmware loading was only possible using the
+sysfs mechanism the userspace component "hotplug" provided the functionality of
+monitoring for kobject events. Historically this was superseded be systemd's
+udev, however firmware loading support was removed from udev as of systemd
+commit be2ea723b1d0 ("udev: remove userspace firmware loading support")
+as of v217 on August, 2014. This means most Linux distributions today are
+not using or taking advantage of the firmware fallback mechanism provided
+by kobject uevents. This is specially exacerbated due to the fact that most
+distributions today disable CONFIG_FW_LOADER_USER_HELPER_FALLBACK.
+
+Refer to do_firmware_uevent() for details of the kobject event variables
+setup. The variables currently passed to userspace with a "kobject add"
+event are:
+
+* FIRMWARE=firmware name
+* TIMEOUT=timeout value
+* ASYNC=whether or not the API request was asynchronous
+
+By default DEVPATH is set by the internal kernel kobject infrastructure.
+Below is an example simple kobject uevent script::
+
+ # Both $DEVPATH and $FIRMWARE are already provided in the environment.
+ MY_FW_DIR=/lib/firmware/
+ echo 1 > /sys/$DEVPATH/loading
+ cat $MY_FW_DIR/$FIRMWARE > /sys/$DEVPATH/data
+ echo 0 > /sys/$DEVPATH/loading
+
+Firmware custom fallback mechanism
+==================================
+
+Users of the request_firmware_nowait() call have yet another option available
+at their disposal: rely on the sysfs fallback mechanism but request that no
+kobject uevents be issued to userspace. The original logic behind this
+was that utilities other than udev might be required to lookup firmware
+in non-traditional paths -- paths outside of the listing documented in the
+section 'Direct filesystem lookup'. This option is not available to any of
+the other API calls as uevents are always forced for them.
+
+Since uevents are only meaningful if the fallback mechanism is enabled
+in your kernel it would seem odd to enable uevents with kernels that do not
+have the fallback mechanism enabled in their kernels. Unfortunately we also
+rely on the uevent flag which can be disabled by request_firmware_nowait() to
+also setup the firmware cache for firmware requests. As documented above,
+the firmware cache is only set up if uevent is enabled for an API call.
+Although this can disable the firmware cache for request_firmware_nowait()
+calls, users of this API should not use it for the purposes of disabling
+the cache as that was not the original purpose of the flag. Not setting
+the uevent flag means you want to opt-in for the firmware fallback mechanism
+but you want to suppress kobject uevents, as you have a custom solution which
+will monitor for your device addition into the device hierarchy somehow and
+load firmware for you through a custom path.
+
+Firmware fallback timeout
+=========================
+
+The firmware fallback mechanism has a timeout. If firmware is not loaded
+onto the sysfs interface by the timeout value an error is sent to the
+driver. By default the timeout is set to 60 seconds if uevents are
+desirable, otherwise MAX_JIFFY_OFFSET is used (max timeout possible).
+The logic behind using MAX_JIFFY_OFFSET for non-uevents is that a custom
+solution will have as much time as it needs to load firmware.
+
+You can customize the firmware timeout by echo'ing your desired timeout into
+the following file:
+
+* /sys/class/firmware/timeout
+
+If you echo 0 into it means MAX_JIFFY_OFFSET will be used. The data type
+for the timeout is an int.
+
+EFI embedded firmware fallback mechanism
+========================================
+
+On some devices the system's EFI code / ROM may contain an embedded copy
+of firmware for some of the system's integrated peripheral devices and
+the peripheral's Linux device-driver needs to access this firmware.
+
+Device drivers which need such firmware can use the
+firmware_request_platform() function for this, note that this is a
+separate fallback mechanism from the other fallback mechanisms and
+this does not use the sysfs interface.
+
+A device driver which needs this can describe the firmware it needs
+using an efi_embedded_fw_desc struct:
+
+.. kernel-doc:: include/linux/efi_embedded_fw.h
+ :functions: efi_embedded_fw_desc
+
+The EFI embedded-fw code works by scanning all EFI_BOOT_SERVICES_CODE memory
+segments for an eight byte sequence matching prefix; if the prefix is found it
+then does a sha256 over length bytes and if that matches makes a copy of length
+bytes and adds that to its list with found firmwares.
+
+To avoid doing this somewhat expensive scan on all systems, dmi matching is
+used. Drivers are expected to export a dmi_system_id array, with each entries'
+driver_data pointing to an efi_embedded_fw_desc.
+
+To register this array with the efi-embedded-fw code, a driver needs to:
+
+1. Always be builtin to the kernel or store the dmi_system_id array in a
+ separate object file which always gets builtin.
+
+2. Add an extern declaration for the dmi_system_id array to
+ include/linux/efi_embedded_fw.h.
+
+3. Add the dmi_system_id array to the embedded_fw_table in
+ drivers/firmware/efi/embedded-firmware.c wrapped in a #ifdef testing that
+ the driver is being builtin.
+
+4. Add "select EFI_EMBEDDED_FIRMWARE if EFI_STUB" to its Kconfig entry.
+
+The firmware_request_platform() function will always first try to load firmware
+with the specified name directly from the disk, so the EFI embedded-fw can
+always be overridden by placing a file under /lib/firmware.
+
+Note that:
+
+1. The code scanning for EFI embedded-firmware runs near the end
+ of start_kernel(), just before calling rest_init(). For normal drivers and
+ subsystems using subsys_initcall() to register themselves this does not
+ matter. This means that code running earlier cannot use EFI
+ embedded-firmware.
+
+2. At the moment the EFI embedded-fw code assumes that firmwares always start at
+ an offset which is a multiple of 8 bytes, if this is not true for your case
+ send in a patch to fix this.
+
+3. At the moment the EFI embedded-fw code only works on x86 because other archs
+ free EFI_BOOT_SERVICES_CODE before the EFI embedded-fw code gets a chance to
+ scan it.
+
+4. The current brute-force scanning of EFI_BOOT_SERVICES_CODE is an ad-hoc
+ brute-force solution. There has been discussion to use the UEFI Platform
+ Initialization (PI) spec's Firmware Volume protocol. This has been rejected
+ because the FV Protocol relies on *internal* interfaces of the PI spec, and:
+ 1. The PI spec does not define peripheral firmware at all
+ 2. The internal interfaces of the PI spec do not guarantee any backward
+ compatibility. Any implementation details in FV may be subject to change,
+ and may vary system to system. Supporting the FV Protocol would be
+ difficult as it is purposely ambiguous.
+
+Example how to check for and extract embedded firmware
+------------------------------------------------------
+
+To check for, for example Silead touchscreen controller embedded firmware,
+do the following:
+
+1. Boot the system with efi=debug on the kernel commandline
+
+2. cp /sys/kernel/debug/efi/boot_services_code? to your home dir
+
+3. Open the boot_services_code? files in a hex-editor, search for the
+ magic prefix for Silead firmware: F0 00 00 00 02 00 00 00, this gives you
+ the beginning address of the firmware inside the boot_services_code? file.
+
+4. The firmware has a specific pattern, it starts with a 8 byte page-address,
+ typically F0 00 00 00 02 00 00 00 for the first page followed by 32-bit
+ word-address + 32-bit value pairs. With the word-address incrementing 4
+ bytes (1 word) for each pair until a page is complete. A complete page is
+ followed by a new page-address, followed by more word + value pairs. This
+ leads to a very distinct pattern. Scroll down until this pattern stops,
+ this gives you the end of the firmware inside the boot_services_code? file.
+
+5. "dd if=boot_services_code? of=firmware bs=1 skip=<begin-addr> count=<len>"
+ will extract the firmware for you. Inspect the firmware file in a
+ hexeditor to make sure you got the dd parameters correct.
+
+6. Copy it to /lib/firmware under the expected name to test it.
+
+7. If the extracted firmware works, you can use the found info to fill an
+ efi_embedded_fw_desc struct to describe it, run "sha256sum firmware"
+ to get the sha256sum to put in the sha256 field.
diff --git a/Documentation/driver-api/firmware/firmware-usage-guidelines.rst b/Documentation/driver-api/firmware/firmware-usage-guidelines.rst
new file mode 100644
index 0000000000..fdcfce42c6
--- /dev/null
+++ b/Documentation/driver-api/firmware/firmware-usage-guidelines.rst
@@ -0,0 +1,44 @@
+===================
+Firmware Guidelines
+===================
+
+Users switching to a newer kernel should *not* have to install newer
+firmware files to keep their hardware working. At the same time updated
+firmware files must not cause any regressions for users of older kernel
+releases.
+
+Drivers that use firmware from linux-firmware should follow the rules in
+this guide. (Where there is limited control of the firmware,
+i.e. company doesn't support Linux, firmwares sourced from misc places,
+then of course these rules will not apply strictly.)
+
+* Firmware files shall be designed in a way that it allows checking for
+ firmware ABI version changes. It is recommended that firmware files be
+ versioned with at least a major/minor version. It is suggested that
+ the firmware files in linux-firmware be named with some device
+ specific name, and just the major version. The firmware version should
+ be stored in the firmware header, or as an exception, as part of the
+ firmware file name, in order to let the driver detact any non-ABI
+ fixes/changes. The firmware files in linux-firmware should be
+ overwritten with the newest compatible major version. Newer major
+ version firmware shall remain compatible with all kernels that load
+ that major number.
+
+* If the kernel support for the hardware is normally inactive, or the
+ hardware isn't available for public consumption, this can
+ be ignored, until the first kernel release that enables that hardware.
+ This means no major version bumps without the kernel retaining
+ backwards compatibility for the older major versions. Minor version
+ bumps should not introduce new features that newer kernels depend on
+ non-optionally.
+
+* If a security fix needs lockstep firmware and kernel fixes in order to
+ be successful, then all supported major versions in the linux-firmware
+ repo that are required by currently supported stable/LTS kernels,
+ should be updated with the security fix. The kernel patches should
+ detect if the firmware is new enough to declare if the security issue
+ is fixed. All communications around security fixes should point at
+ both the firmware and kernel fixes. If a security fix requires
+ deprecating old major versions, then this should only be done as a
+ last option, and be stated clearly in all communications.
+
diff --git a/Documentation/driver-api/firmware/firmware_cache.rst b/Documentation/driver-api/firmware/firmware_cache.rst
new file mode 100644
index 0000000000..417b9e8347
--- /dev/null
+++ b/Documentation/driver-api/firmware/firmware_cache.rst
@@ -0,0 +1,51 @@
+==============
+Firmware cache
+==============
+
+When Linux resumes from suspend some device drivers require firmware lookups to
+re-initialize devices. During resume there may be a period of time during which
+firmware lookups are not possible, during this short period of time firmware
+requests will fail. Time is of essence though, and delaying drivers to wait for
+the root filesystem for firmware delays user experience with device
+functionality. In order to support these requirements the firmware
+infrastructure implements a firmware cache for device drivers for most API
+calls, automatically behind the scenes.
+
+The firmware cache makes using certain firmware API calls safe during a device
+driver's suspend and resume callback. Users of these API calls needn't cache
+the firmware by themselves for dealing with firmware loss during system resume.
+
+The firmware cache works by requesting for firmware prior to suspend and
+caching it in memory. Upon resume device drivers using the firmware API will
+have access to the firmware immediately, without having to wait for the root
+filesystem to mount or dealing with possible race issues with lookups as the
+root filesystem mounts.
+
+Some implementation details about the firmware cache setup:
+
+* The firmware cache is setup by adding a devres entry for each device that
+ uses all synchronous call except :c:func:`request_firmware_into_buf`.
+
+* If an asynchronous call is used the firmware cache is only set up for a
+ device if the second argument (uevent) to request_firmware_nowait() is
+ true. When uevent is true it requests that a kobject uevent be sent to
+ userspace for the firmware request through the sysfs fallback mechanism
+ if the firmware file is not found.
+
+* If the firmware cache is determined to be needed as per the above two
+ criteria the firmware cache is setup by adding a devres entry for the
+ device making the firmware request.
+
+* The firmware devres entry is maintained throughout the lifetime of the
+ device. This means that even if you release_firmware() the firmware cache
+ will still be used on resume from suspend.
+
+* The timeout for the fallback mechanism is temporarily reduced to 10 seconds
+ as the firmware cache is set up during suspend, the timeout is set back to
+ the old value you had configured after the cache is set up.
+
+* Upon suspend any pending non-uevent firmware requests are killed to avoid
+ stalling the kernel, this is done with kill_requests_without_uevent(). Kernel
+ calls requiring the non-uevent therefore need to implement their own firmware
+ cache mechanism but must not use the firmware API on suspend.
+
diff --git a/Documentation/driver-api/firmware/fw_search_path.rst b/Documentation/driver-api/firmware/fw_search_path.rst
new file mode 100644
index 0000000000..d7cb1e8f00
--- /dev/null
+++ b/Documentation/driver-api/firmware/fw_search_path.rst
@@ -0,0 +1,31 @@
+=====================
+Firmware search paths
+=====================
+
+The following search paths are used to look for firmware on your
+root filesystem.
+
+* fw_path_para - module parameter - default is empty so this is ignored
+* /lib/firmware/updates/UTS_RELEASE/
+* /lib/firmware/updates/
+* /lib/firmware/UTS_RELEASE/
+* /lib/firmware/
+
+The module parameter ''path'' can be passed to the firmware_class module
+to activate the first optional custom fw_path_para. The custom path can
+only be up to 256 characters long. The kernel parameter passed would be:
+
+* 'firmware_class.path=$CUSTOMIZED_PATH'
+
+There is an alternative to customize the path at run time after bootup, you
+can use the file:
+
+* /sys/module/firmware_class/parameters/path
+
+You would echo into it your custom path and firmware requested will be searched
+for there first. Be aware that newline characters will be taken into account
+and may not produce the intended effects. For instance you might want to use:
+
+echo -n /path/to/script > /sys/module/firmware_class/parameters/path
+
+to ensure that your script is being used.
diff --git a/Documentation/driver-api/firmware/fw_upload.rst b/Documentation/driver-api/firmware/fw_upload.rst
new file mode 100644
index 0000000000..edf1d0c5e7
--- /dev/null
+++ b/Documentation/driver-api/firmware/fw_upload.rst
@@ -0,0 +1,127 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===================
+Firmware Upload API
+===================
+
+A device driver that registers with the firmware loader will expose
+persistent sysfs nodes to enable users to initiate firmware updates for
+that device. It is the responsibility of the device driver and/or the
+device itself to perform any validation on the data received. Firmware
+upload uses the same *loading* and *data* sysfs files described in the
+documentation for firmware fallback. It also adds additional sysfs files
+to provide status on the transfer of the firmware image to the device.
+
+Register for firmware upload
+============================
+
+A device driver registers for firmware upload by calling
+firmware_upload_register(). Among the parameter list is a name to
+identify the device under /sys/class/firmware. A user may initiate a
+firmware upload by echoing a 1 to the *loading* sysfs file for the target
+device. Next, the user writes the firmware image to the *data* sysfs
+file. After writing the firmware data, the user echos 0 to the *loading*
+sysfs file to signal completion. Echoing 0 to *loading* also triggers the
+transfer of the firmware to the lower-lever device driver in the context
+of a kernel worker thread.
+
+To use the firmware upload API, write a driver that implements a set of
+ops. The probe function calls firmware_upload_register() and the remove
+function calls firmware_upload_unregister() such as::
+
+ static const struct fw_upload_ops m10bmc_ops = {
+ .prepare = m10bmc_sec_prepare,
+ .write = m10bmc_sec_write,
+ .poll_complete = m10bmc_sec_poll_complete,
+ .cancel = m10bmc_sec_cancel,
+ .cleanup = m10bmc_sec_cleanup,
+ };
+
+ static int m10bmc_sec_probe(struct platform_device *pdev)
+ {
+ const char *fw_name, *truncate;
+ struct m10bmc_sec *sec;
+ struct fw_upload *fwl;
+ unsigned int len;
+
+ sec = devm_kzalloc(&pdev->dev, sizeof(*sec), GFP_KERNEL);
+ if (!sec)
+ return -ENOMEM;
+
+ sec->dev = &pdev->dev;
+ sec->m10bmc = dev_get_drvdata(pdev->dev.parent);
+ dev_set_drvdata(&pdev->dev, sec);
+
+ fw_name = dev_name(sec->dev);
+ truncate = strstr(fw_name, ".auto");
+ len = (truncate) ? truncate - fw_name : strlen(fw_name);
+ sec->fw_name = kmemdup_nul(fw_name, len, GFP_KERNEL);
+
+ fwl = firmware_upload_register(THIS_MODULE, sec->dev, sec->fw_name,
+ &m10bmc_ops, sec);
+ if (IS_ERR(fwl)) {
+ dev_err(sec->dev, "Firmware Upload driver failed to start\n");
+ kfree(sec->fw_name);
+ return PTR_ERR(fwl);
+ }
+
+ sec->fwl = fwl;
+ return 0;
+ }
+
+ static int m10bmc_sec_remove(struct platform_device *pdev)
+ {
+ struct m10bmc_sec *sec = dev_get_drvdata(&pdev->dev);
+
+ firmware_upload_unregister(sec->fwl);
+ kfree(sec->fw_name);
+ return 0;
+ }
+
+firmware_upload_register
+------------------------
+.. kernel-doc:: drivers/base/firmware_loader/sysfs_upload.c
+ :identifiers: firmware_upload_register
+
+firmware_upload_unregister
+--------------------------
+.. kernel-doc:: drivers/base/firmware_loader/sysfs_upload.c
+ :identifiers: firmware_upload_unregister
+
+Firmware Upload Ops
+-------------------
+.. kernel-doc:: include/linux/firmware.h
+ :identifiers: fw_upload_ops
+
+Firmware Upload Progress Codes
+------------------------------
+The following progress codes are used internally by the firmware loader.
+Corresponding strings are reported through the status sysfs node that
+is described below and are documented in the ABI documentation.
+
+.. kernel-doc:: drivers/base/firmware_loader/sysfs_upload.h
+ :identifiers: fw_upload_prog
+
+Firmware Upload Error Codes
+---------------------------
+The following error codes may be returned by the driver ops in case of
+failure:
+
+.. kernel-doc:: include/linux/firmware.h
+ :identifiers: fw_upload_err
+
+Sysfs Attributes
+================
+
+In addition to the *loading* and *data* sysfs files, there are additional
+sysfs files to monitor the status of the data transfer to the target
+device and to determine the final pass/fail status of the transfer.
+Depending on the device and the size of the firmware image, a firmware
+update could take milliseconds or minutes.
+
+The additional sysfs files are:
+
+* status - provides an indication of the progress of a firmware update
+* error - provides error information for a failed firmware update
+* remaining_size - tracks the data transfer portion of an update
+* cancel - echo 1 to this file to cancel the update
diff --git a/Documentation/driver-api/firmware/index.rst b/Documentation/driver-api/firmware/index.rst
new file mode 100644
index 0000000000..9d2c19dc8e
--- /dev/null
+++ b/Documentation/driver-api/firmware/index.rst
@@ -0,0 +1,19 @@
+==================
+Linux Firmware API
+==================
+
+.. toctree::
+
+ introduction
+ core
+ efi/index
+ request_firmware
+ fw_upload
+ other_interfaces
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/firmware/introduction.rst b/Documentation/driver-api/firmware/introduction.rst
new file mode 100644
index 0000000000..211cb44eb9
--- /dev/null
+++ b/Documentation/driver-api/firmware/introduction.rst
@@ -0,0 +1,27 @@
+============
+Introduction
+============
+
+The firmware API enables kernel code to request files required
+for functionality from userspace, the uses vary:
+
+* Microcode for CPU errata
+* Device driver firmware, required to be loaded onto device
+ microcontrollers
+* Device driver information data (calibration data, EEPROM overrides),
+ some of which can be completely optional.
+
+Types of firmware requests
+==========================
+
+There are two types of calls:
+
+* Synchronous
+* Asynchronous
+
+Which one you use vary depending on your requirements, the rule of thumb
+however is you should strive to use the asynchronous APIs unless you also
+are already using asynchronous initialization mechanisms which will not
+stall or delay boot. Even if loading firmware does not take a lot of time
+processing firmware might, and this can still delay boot or initialization,
+as such mechanisms such as asynchronous probe can help supplement drivers.
diff --git a/Documentation/driver-api/firmware/lookup-order.rst b/Documentation/driver-api/firmware/lookup-order.rst
new file mode 100644
index 0000000000..6064672a78
--- /dev/null
+++ b/Documentation/driver-api/firmware/lookup-order.rst
@@ -0,0 +1,20 @@
+=====================
+Firmware lookup order
+=====================
+
+Different functionality is available to enable firmware to be found.
+Below is chronological order of how firmware will be looked for once
+a driver issues a firmware API call.
+
+* The ''Built-in firmware'' is checked first, if the firmware is present we
+ return it immediately
+* The ''Firmware cache'' is looked at next. If the firmware is found we
+ return it immediately
+* The ''Direct filesystem lookup'' is performed next, if found we
+ return it immediately
+* The ''Platform firmware fallback'' is performed next, but only when
+ firmware_request_platform() is used, if found we return it immediately
+* If no firmware has been found and the fallback mechanism was enabled
+ the sysfs interface is created. After this either a kobject uevent
+ is issued or the custom firmware loading is relied upon for firmware
+ loading up to the timeout value.
diff --git a/Documentation/driver-api/firmware/other_interfaces.rst b/Documentation/driver-api/firmware/other_interfaces.rst
new file mode 100644
index 0000000000..06ac89adaa
--- /dev/null
+++ b/Documentation/driver-api/firmware/other_interfaces.rst
@@ -0,0 +1,51 @@
+Other Firmware Interfaces
+=========================
+
+DMI Interfaces
+--------------
+
+.. kernel-doc:: drivers/firmware/dmi_scan.c
+ :export:
+
+EDD Interfaces
+--------------
+
+.. kernel-doc:: drivers/firmware/edd.c
+ :internal:
+
+Generic System Framebuffers Interface
+-------------------------------------
+
+.. kernel-doc:: drivers/firmware/sysfb.c
+ :export:
+
+Intel Stratix10 SoC Service Layer
+---------------------------------
+Some features of the Intel Stratix10 SoC require a level of privilege
+higher than the kernel is granted. Such secure features include
+FPGA programming. In terms of the ARMv8 architecture, the kernel runs
+at Exception Level 1 (EL1), access to the features requires
+Exception Level 3 (EL3).
+
+The Intel Stratix10 SoC service layer provides an in kernel API for
+drivers to request access to the secure features. The requests are queued
+and processed one by one. ARM’s SMCCC is used to pass the execution
+of the requests on to a secure monitor (EL3).
+
+.. kernel-doc:: include/linux/firmware/intel/stratix10-svc-client.h
+ :functions: stratix10_svc_command_code
+
+.. kernel-doc:: include/linux/firmware/intel/stratix10-svc-client.h
+ :functions: stratix10_svc_client_msg
+
+.. kernel-doc:: include/linux/firmware/intel/stratix10-svc-client.h
+ :functions: stratix10_svc_command_config_type
+
+.. kernel-doc:: include/linux/firmware/intel/stratix10-svc-client.h
+ :functions: stratix10_svc_cb_data
+
+.. kernel-doc:: include/linux/firmware/intel/stratix10-svc-client.h
+ :functions: stratix10_svc_client
+
+.. kernel-doc:: drivers/firmware/stratix10-svc.c
+ :export:
diff --git a/Documentation/driver-api/firmware/request_firmware.rst b/Documentation/driver-api/firmware/request_firmware.rst
new file mode 100644
index 0000000000..0d6ea03299
--- /dev/null
+++ b/Documentation/driver-api/firmware/request_firmware.rst
@@ -0,0 +1,80 @@
+====================
+request_firmware API
+====================
+
+You would typically load firmware and then load it into your device somehow.
+The typical firmware work flow is reflected below::
+
+ if(request_firmware(&fw_entry, $FIRMWARE, device) == 0)
+ copy_fw_to_device(fw_entry->data, fw_entry->size);
+ release_firmware(fw_entry);
+
+Synchronous firmware requests
+=============================
+
+Synchronous firmware requests will wait until the firmware is found or until
+an error is returned.
+
+request_firmware
+----------------
+.. kernel-doc:: drivers/base/firmware_loader/main.c
+ :functions: request_firmware
+
+firmware_request_nowarn
+-----------------------
+.. kernel-doc:: drivers/base/firmware_loader/main.c
+ :functions: firmware_request_nowarn
+
+firmware_request_platform
+-------------------------
+.. kernel-doc:: drivers/base/firmware_loader/main.c
+ :functions: firmware_request_platform
+
+request_firmware_direct
+-----------------------
+.. kernel-doc:: drivers/base/firmware_loader/main.c
+ :functions: request_firmware_direct
+
+request_firmware_into_buf
+-------------------------
+.. kernel-doc:: drivers/base/firmware_loader/main.c
+ :functions: request_firmware_into_buf
+
+Asynchronous firmware requests
+==============================
+
+Asynchronous firmware requests allow driver code to not have to wait
+until the firmware or an error is returned. Function callbacks are
+provided so that when the firmware or an error is found the driver is
+informed through the callback. request_firmware_nowait() cannot be called
+in atomic contexts.
+
+request_firmware_nowait
+-----------------------
+.. kernel-doc:: drivers/base/firmware_loader/main.c
+ :functions: request_firmware_nowait
+
+Special optimizations on reboot
+===============================
+
+Some devices have an optimization in place to enable the firmware to be
+retained during system reboot. When such optimizations are used the driver
+author must ensure the firmware is still available on resume from suspend,
+this can be done with firmware_request_cache() instead of requesting for the
+firmware to be loaded.
+
+firmware_request_cache()
+------------------------
+.. kernel-doc:: drivers/base/firmware_loader/main.c
+ :functions: firmware_request_cache
+
+request firmware API expected driver use
+========================================
+
+Once an API call returns you process the firmware and then release the
+firmware. For example if you used request_firmware() and it returns,
+the driver has the firmware image accessible in fw_entry->{data,size}.
+If something went wrong request_firmware() returns non-zero and fw_entry
+is set to NULL. Once your driver is done with processing the firmware it
+can call release_firmware(fw_entry) to release the firmware image
+and any related resource.
diff --git a/Documentation/driver-api/fpga/fpga-bridge.rst b/Documentation/driver-api/fpga/fpga-bridge.rst
new file mode 100644
index 0000000000..6042085340
--- /dev/null
+++ b/Documentation/driver-api/fpga/fpga-bridge.rst
@@ -0,0 +1,22 @@
+FPGA Bridge
+===========
+
+API to implement a new FPGA bridge
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+* struct fpga_bridge - The FPGA Bridge structure
+* struct fpga_bridge_ops - Low level Bridge driver ops
+* fpga_bridge_register() - Create and register a bridge
+* fpga_bridge_unregister() - Unregister a bridge
+
+.. kernel-doc:: include/linux/fpga/fpga-bridge.h
+ :functions: fpga_bridge
+
+.. kernel-doc:: include/linux/fpga/fpga-bridge.h
+ :functions: fpga_bridge_ops
+
+.. kernel-doc:: drivers/fpga/fpga-bridge.c
+ :functions: fpga_bridge_register
+
+.. kernel-doc:: drivers/fpga/fpga-bridge.c
+ :functions: fpga_bridge_unregister
diff --git a/Documentation/driver-api/fpga/fpga-mgr.rst b/Documentation/driver-api/fpga/fpga-mgr.rst
new file mode 100644
index 0000000000..49c0a95126
--- /dev/null
+++ b/Documentation/driver-api/fpga/fpga-mgr.rst
@@ -0,0 +1,162 @@
+FPGA Manager
+============
+
+Overview
+--------
+
+The FPGA manager core exports a set of functions for programming an FPGA with
+an image. The API is manufacturer agnostic. All manufacturer specifics are
+hidden away in a low level driver which registers a set of ops with the core.
+The FPGA image data itself is very manufacturer specific, but for our purposes
+it's just binary data. The FPGA manager core won't parse it.
+
+The FPGA image to be programmed can be in a scatter gather list, a single
+contiguous buffer, or a firmware file. Because allocating contiguous kernel
+memory for the buffer should be avoided, users are encouraged to use a scatter
+gather list instead if possible.
+
+The particulars for programming the image are presented in a structure (struct
+fpga_image_info). This struct contains parameters such as pointers to the
+FPGA image as well as image-specific particulars such as whether the image was
+built for full or partial reconfiguration.
+
+How to support a new FPGA device
+--------------------------------
+
+To add another FPGA manager, write a driver that implements a set of ops. The
+probe function calls fpga_mgr_register() or fpga_mgr_register_full(), such as::
+
+ static const struct fpga_manager_ops socfpga_fpga_ops = {
+ .write_init = socfpga_fpga_ops_configure_init,
+ .write = socfpga_fpga_ops_configure_write,
+ .write_complete = socfpga_fpga_ops_configure_complete,
+ .state = socfpga_fpga_ops_state,
+ };
+
+ static int socfpga_fpga_probe(struct platform_device *pdev)
+ {
+ struct device *dev = &pdev->dev;
+ struct socfpga_fpga_priv *priv;
+ struct fpga_manager *mgr;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ /*
+ * do ioremaps, get interrupts, etc. and save
+ * them in priv
+ */
+
+ mgr = fpga_mgr_register(dev, "Altera SOCFPGA FPGA Manager",
+ &socfpga_fpga_ops, priv);
+ if (IS_ERR(mgr))
+ return PTR_ERR(mgr);
+
+ platform_set_drvdata(pdev, mgr);
+
+ return 0;
+ }
+
+ static int socfpga_fpga_remove(struct platform_device *pdev)
+ {
+ struct fpga_manager *mgr = platform_get_drvdata(pdev);
+
+ fpga_mgr_unregister(mgr);
+
+ return 0;
+ }
+
+Alternatively, the probe function could call one of the resource managed
+register functions, devm_fpga_mgr_register() or devm_fpga_mgr_register_full().
+When these functions are used, the parameter syntax is the same, but the call
+to fpga_mgr_unregister() should be removed. In the above example, the
+socfpga_fpga_remove() function would not be required.
+
+The ops will implement whatever device specific register writes are needed to
+do the programming sequence for this particular FPGA. These ops return 0 for
+success or negative error codes otherwise.
+
+The programming sequence is::
+ 1. .parse_header (optional, may be called once or multiple times)
+ 2. .write_init
+ 3. .write or .write_sg (may be called once or multiple times)
+ 4. .write_complete
+
+The .parse_header function will set header_size and data_size to
+struct fpga_image_info. Before parse_header call, header_size is initialized
+with initial_header_size. If flag skip_header of fpga_manager_ops is true,
+.write function will get image buffer starting at header_size offset from the
+beginning. If data_size is set, .write function will get data_size bytes of
+the image buffer, otherwise .write will get data up to the end of image buffer.
+This will not affect .write_sg, .write_sg will still get whole image in
+sg_table form. If FPGA image is already mapped as a single contiguous buffer,
+whole buffer will be passed into .parse_header. If image is in scatter-gather
+form, core code will buffer up at least .initial_header_size before the first
+call of .parse_header, if it is not enough, .parse_header should set desired
+size into info->header_size and return -EAGAIN, then it will be called again
+with greater part of image buffer on the input.
+
+The .write_init function will prepare the FPGA to receive the image data. The
+buffer passed into .write_init will be at least info->header_size bytes long;
+if the whole bitstream is not immediately available then the core code will
+buffer up at least this much before starting.
+
+The .write function writes a buffer to the FPGA. The buffer may be contain the
+whole FPGA image or may be a smaller chunk of an FPGA image. In the latter
+case, this function is called multiple times for successive chunks. This interface
+is suitable for drivers which use PIO.
+
+The .write_sg version behaves the same as .write except the input is a sg_table
+scatter list. This interface is suitable for drivers which use DMA.
+
+The .write_complete function is called after all the image has been written
+to put the FPGA into operating mode.
+
+The ops include a .state function which will determine the state the FPGA is in
+and return a code of type enum fpga_mgr_states. It doesn't result in a change
+in state.
+
+API for implementing a new FPGA Manager driver
+----------------------------------------------
+
+* ``fpga_mgr_states`` - Values for :c:expr:`fpga_manager->state`.
+* struct fpga_manager - the FPGA manager struct
+* struct fpga_manager_ops - Low level FPGA manager driver ops
+* struct fpga_manager_info - Parameter structure for fpga_mgr_register_full()
+* fpga_mgr_register_full() - Create and register an FPGA manager using the
+ fpga_mgr_info structure to provide the full flexibility of options
+* fpga_mgr_register() - Create and register an FPGA manager using standard
+ arguments
+* devm_fpga_mgr_register_full() - Resource managed version of
+ fpga_mgr_register_full()
+* devm_fpga_mgr_register() - Resource managed version of fpga_mgr_register()
+* fpga_mgr_unregister() - Unregister an FPGA manager
+
+.. kernel-doc:: include/linux/fpga/fpga-mgr.h
+ :functions: fpga_mgr_states
+
+.. kernel-doc:: include/linux/fpga/fpga-mgr.h
+ :functions: fpga_manager
+
+.. kernel-doc:: include/linux/fpga/fpga-mgr.h
+ :functions: fpga_manager_ops
+
+.. kernel-doc:: include/linux/fpga/fpga-mgr.h
+ :functions: fpga_manager_info
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: fpga_mgr_register_full
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: fpga_mgr_register
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: devm_fpga_mgr_register_full
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: devm_fpga_mgr_register
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: fpga_mgr_unregister
diff --git a/Documentation/driver-api/fpga/fpga-programming.rst b/Documentation/driver-api/fpga/fpga-programming.rst
new file mode 100644
index 0000000000..fb4da4240e
--- /dev/null
+++ b/Documentation/driver-api/fpga/fpga-programming.rst
@@ -0,0 +1,107 @@
+In-kernel API for FPGA Programming
+==================================
+
+Overview
+--------
+
+The in-kernel API for FPGA programming is a combination of APIs from
+FPGA manager, bridge, and regions. The actual function used to
+trigger FPGA programming is fpga_region_program_fpga().
+
+fpga_region_program_fpga() uses functionality supplied by
+the FPGA manager and bridges. It will:
+
+ * lock the region's mutex
+ * lock the mutex of the region's FPGA manager
+ * build a list of FPGA bridges if a method has been specified to do so
+ * disable the bridges
+ * program the FPGA using info passed in :c:expr:`fpga_region->info`.
+ * re-enable the bridges
+ * release the locks
+
+The struct fpga_image_info specifies what FPGA image to program. It is
+allocated/freed by fpga_image_info_alloc() and freed with
+fpga_image_info_free()
+
+How to program an FPGA using a region
+-------------------------------------
+
+When the FPGA region driver probed, it was given a pointer to an FPGA manager
+driver so it knows which manager to use. The region also either has a list of
+bridges to control during programming or it has a pointer to a function that
+will generate that list. Here's some sample code of what to do next::
+
+ #include <linux/fpga/fpga-mgr.h>
+ #include <linux/fpga/fpga-region.h>
+
+ struct fpga_image_info *info;
+ int ret;
+
+ /*
+ * First, alloc the struct with information about the FPGA image to
+ * program.
+ */
+ info = fpga_image_info_alloc(dev);
+ if (!info)
+ return -ENOMEM;
+
+ /* Set flags as needed, such as: */
+ info->flags = FPGA_MGR_PARTIAL_RECONFIG;
+
+ /*
+ * Indicate where the FPGA image is. This is pseudo-code; you're
+ * going to use one of these three.
+ */
+ if (image is in a scatter gather table) {
+
+ info->sgt = [your scatter gather table]
+
+ } else if (image is in a buffer) {
+
+ info->buf = [your image buffer]
+ info->count = [image buffer size]
+
+ } else if (image is in a firmware file) {
+
+ info->firmware_name = devm_kstrdup(dev, firmware_name,
+ GFP_KERNEL);
+
+ }
+
+ /* Add info to region and do the programming */
+ region->info = info;
+ ret = fpga_region_program_fpga(region);
+
+ /* Deallocate the image info if you're done with it */
+ region->info = NULL;
+ fpga_image_info_free(info);
+
+ if (ret)
+ return ret;
+
+ /* Now enumerate whatever hardware has appeared in the FPGA. */
+
+API for programming an FPGA
+---------------------------
+
+* fpga_region_program_fpga() - Program an FPGA
+* fpga_image_info() - Specifies what FPGA image to program
+* fpga_image_info_alloc() - Allocate an FPGA image info struct
+* fpga_image_info_free() - Free an FPGA image info struct
+
+.. kernel-doc:: drivers/fpga/fpga-region.c
+ :functions: fpga_region_program_fpga
+
+FPGA Manager flags
+
+.. kernel-doc:: include/linux/fpga/fpga-mgr.h
+ :doc: FPGA Manager flags
+
+.. kernel-doc:: include/linux/fpga/fpga-mgr.h
+ :functions: fpga_image_info
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: fpga_image_info_alloc
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: fpga_image_info_free
diff --git a/Documentation/driver-api/fpga/fpga-region.rst b/Documentation/driver-api/fpga/fpga-region.rst
new file mode 100644
index 0000000000..dc55d60a0b
--- /dev/null
+++ b/Documentation/driver-api/fpga/fpga-region.rst
@@ -0,0 +1,109 @@
+FPGA Region
+===========
+
+Overview
+--------
+
+This document is meant to be a brief overview of the FPGA region API usage. A
+more conceptual look at regions can be found in the Device Tree binding
+document [#f1]_.
+
+For the purposes of this API document, let's just say that a region associates
+an FPGA Manager and a bridge (or bridges) with a reprogrammable region of an
+FPGA or the whole FPGA. The API provides a way to register a region and to
+program a region.
+
+Currently the only layer above fpga-region.c in the kernel is the Device Tree
+support (of-fpga-region.c) described in [#f1]_. The DT support layer uses regions
+to program the FPGA and then DT to handle enumeration. The common region code
+is intended to be used by other schemes that have other ways of accomplishing
+enumeration after programming.
+
+An fpga-region can be set up to know the following things:
+
+ * which FPGA manager to use to do the programming
+
+ * which bridges to disable before programming and enable afterwards.
+
+Additional info needed to program the FPGA image is passed in the struct
+fpga_image_info including:
+
+ * pointers to the image as either a scatter-gather buffer, a contiguous
+ buffer, or the name of firmware file
+
+ * flags indicating specifics such as whether the image is for partial
+ reconfiguration.
+
+How to add a new FPGA region
+----------------------------
+
+An example of usage can be seen in the probe function of [#f2]_.
+
+.. [#f1] ../devicetree/bindings/fpga/fpga-region.txt
+.. [#f2] ../../drivers/fpga/of-fpga-region.c
+
+API to add a new FPGA region
+----------------------------
+
+* struct fpga_region - The FPGA region struct
+* struct fpga_region_info - Parameter structure for fpga_region_register_full()
+* fpga_region_register_full() - Create and register an FPGA region using the
+ fpga_region_info structure to provide the full flexibility of options
+* fpga_region_register() - Create and register an FPGA region using standard
+ arguments
+* fpga_region_unregister() - Unregister an FPGA region
+
+The FPGA region's probe function will need to get a reference to the FPGA
+Manager it will be using to do the programming. This usually would happen
+during the region's probe function.
+
+* fpga_mgr_get() - Get a reference to an FPGA manager, raise ref count
+* of_fpga_mgr_get() - Get a reference to an FPGA manager, raise ref count,
+ given a device node.
+* fpga_mgr_put() - Put an FPGA manager
+
+The FPGA region will need to specify which bridges to control while programming
+the FPGA. The region driver can build a list of bridges during probe time
+(:c:expr:`fpga_region->bridge_list`) or it can have a function that creates
+the list of bridges to program just before programming
+(:c:expr:`fpga_region->get_bridges`). The FPGA bridge framework supplies the
+following APIs to handle building or tearing down that list.
+
+* fpga_bridge_get_to_list() - Get a ref of an FPGA bridge, add it to a
+ list
+* of_fpga_bridge_get_to_list() - Get a ref of an FPGA bridge, add it to a
+ list, given a device node
+* fpga_bridges_put() - Given a list of bridges, put them
+
+.. kernel-doc:: include/linux/fpga/fpga-region.h
+ :functions: fpga_region
+
+.. kernel-doc:: include/linux/fpga/fpga-region.h
+ :functions: fpga_region_info
+
+.. kernel-doc:: drivers/fpga/fpga-region.c
+ :functions: fpga_region_register_full
+
+.. kernel-doc:: drivers/fpga/fpga-region.c
+ :functions: fpga_region_register
+
+.. kernel-doc:: drivers/fpga/fpga-region.c
+ :functions: fpga_region_unregister
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: fpga_mgr_get
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: of_fpga_mgr_get
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: fpga_mgr_put
+
+.. kernel-doc:: drivers/fpga/fpga-bridge.c
+ :functions: fpga_bridge_get_to_list
+
+.. kernel-doc:: drivers/fpga/fpga-bridge.c
+ :functions: of_fpga_bridge_get_to_list
+
+.. kernel-doc:: drivers/fpga/fpga-bridge.c
+ :functions: fpga_bridges_put
diff --git a/Documentation/driver-api/fpga/index.rst b/Documentation/driver-api/fpga/index.rst
new file mode 100644
index 0000000000..31a4773bd2
--- /dev/null
+++ b/Documentation/driver-api/fpga/index.rst
@@ -0,0 +1,15 @@
+==============
+FPGA Subsystem
+==============
+
+:Author: Alan Tull
+
+.. toctree::
+ :maxdepth: 2
+
+ intro
+ fpga-mgr
+ fpga-bridge
+ fpga-region
+ fpga-programming
+
diff --git a/Documentation/driver-api/fpga/intro.rst b/Documentation/driver-api/fpga/intro.rst
new file mode 100644
index 0000000000..f54c7dabcc
--- /dev/null
+++ b/Documentation/driver-api/fpga/intro.rst
@@ -0,0 +1,54 @@
+Introduction
+============
+
+The FPGA subsystem supports reprogramming FPGAs dynamically under
+Linux. Some of the core intentions of the FPGA subsystems are:
+
+* The FPGA subsystem is vendor agnostic.
+
+* The FPGA subsystem separates upper layers (userspace interfaces and
+ enumeration) from lower layers that know how to program a specific
+ FPGA.
+
+* Code should not be shared between upper and lower layers. This
+ should go without saying. If that seems necessary, there's probably
+ framework functionality that can be added that will benefit
+ other users. Write the linux-fpga mailing list and maintainers and
+ seek out a solution that expands the framework for broad reuse.
+
+* Generally, when adding code, think of the future. Plan for reuse.
+
+The framework in the kernel is divided into:
+
+FPGA Manager
+------------
+
+If you are adding a new FPGA or a new method of programming an FPGA,
+this is the subsystem for you. Low level FPGA manager drivers contain
+the knowledge of how to program a specific device. This subsystem
+includes the framework in fpga-mgr.c and the low level drivers that
+are registered with it.
+
+FPGA Bridge
+-----------
+
+FPGA Bridges prevent spurious signals from going out of an FPGA or a
+region of an FPGA during programming. They are disabled before
+programming begins and re-enabled afterwards. An FPGA bridge may be
+actual hard hardware that gates a bus to a CPU or a soft ("freeze")
+bridge in FPGA fabric that surrounds a partial reconfiguration region
+of an FPGA. This subsystem includes fpga-bridge.c and the low level
+drivers that are registered with it.
+
+FPGA Region
+-----------
+
+If you are adding a new interface to the FPGA framework, add it on top
+of an FPGA region.
+
+The FPGA Region framework (fpga-region.c) associates managers and
+bridges as reconfigurable regions. A region may refer to the whole
+FPGA in full reconfiguration or to a partial reconfiguration region.
+
+The Device Tree FPGA Region support (of-fpga-region.c) handles
+reprogramming FPGAs when device tree overlays are applied.
diff --git a/Documentation/driver-api/frame-buffer.rst b/Documentation/driver-api/frame-buffer.rst
new file mode 100644
index 0000000000..9dd3060f02
--- /dev/null
+++ b/Documentation/driver-api/frame-buffer.rst
@@ -0,0 +1,62 @@
+Frame Buffer Library
+====================
+
+The frame buffer drivers depend heavily on four data structures. These
+structures are declared in include/linux/fb.h. They are fb_info,
+fb_var_screeninfo, fb_fix_screeninfo and fb_monospecs. The last
+three can be made available to and from userland.
+
+fb_info defines the current state of a particular video card. Inside
+fb_info, there exists a fb_ops structure which is a collection of
+needed functions to make fbdev and fbcon work. fb_info is only visible
+to the kernel.
+
+fb_var_screeninfo is used to describe the features of a video card
+that are user defined. With fb_var_screeninfo, things such as depth
+and the resolution may be defined.
+
+The next structure is fb_fix_screeninfo. This defines the properties
+of a card that are created when a mode is set and can't be changed
+otherwise. A good example of this is the start of the frame buffer
+memory. This "locks" the address of the frame buffer memory, so that it
+cannot be changed or moved.
+
+The last structure is fb_monospecs. In the old API, there was little
+importance for fb_monospecs. This allowed for forbidden things such as
+setting a mode of 800x600 on a fix frequency monitor. With the new API,
+fb_monospecs prevents such things, and if used correctly, can prevent a
+monitor from being cooked. fb_monospecs will not be useful until
+kernels 2.5.x.
+
+Frame Buffer Memory
+-------------------
+
+.. kernel-doc:: drivers/video/fbdev/core/fbmem.c
+ :export:
+
+Frame Buffer Colormap
+---------------------
+
+.. kernel-doc:: drivers/video/fbdev/core/fbcmap.c
+ :export:
+
+Frame Buffer Video Mode Database
+--------------------------------
+
+.. kernel-doc:: drivers/video/fbdev/core/modedb.c
+ :internal:
+
+.. kernel-doc:: drivers/video/fbdev/core/modedb.c
+ :export:
+
+Frame Buffer Macintosh Video Mode Database
+------------------------------------------
+
+.. kernel-doc:: drivers/video/fbdev/macmodes.c
+ :export:
+
+Frame Buffer Fonts
+------------------
+
+Refer to the file lib/fonts/fonts.c for more information.
+
diff --git a/Documentation/driver-api/generic-counter.rst b/Documentation/driver-api/generic-counter.rst
new file mode 100644
index 0000000000..71ccc30e58
--- /dev/null
+++ b/Documentation/driver-api/generic-counter.rst
@@ -0,0 +1,573 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=========================
+Generic Counter Interface
+=========================
+
+Introduction
+============
+
+Counter devices are prevalent among a diverse spectrum of industries.
+The ubiquitous presence of these devices necessitates a common interface
+and standard of interaction and exposure. This driver API attempts to
+resolve the issue of duplicate code found among existing counter device
+drivers by introducing a generic counter interface for consumption. The
+Generic Counter interface enables drivers to support and expose a common
+set of components and functionality present in counter devices.
+
+Theory
+======
+
+Counter devices can vary greatly in design, but regardless of whether
+some devices are quadrature encoder counters or tally counters, all
+counter devices consist of a core set of components. This core set of
+components, shared by all counter devices, is what forms the essence of
+the Generic Counter interface.
+
+There are three core components to a counter:
+
+* Signal:
+ Stream of data to be evaluated by the counter.
+
+* Synapse:
+ Association of a Signal, and evaluation trigger, with a Count.
+
+* Count:
+ Accumulation of the effects of connected Synapses.
+
+SIGNAL
+------
+A Signal represents a stream of data. This is the input data that is
+evaluated by the counter to determine the count data; e.g. a quadrature
+signal output line of a rotary encoder. Not all counter devices provide
+user access to the Signal data, so exposure is optional for drivers.
+
+When the Signal data is available for user access, the Generic Counter
+interface provides the following available signal values:
+
+* SIGNAL_LOW:
+ Signal line is in a low state.
+
+* SIGNAL_HIGH:
+ Signal line is in a high state.
+
+A Signal may be associated with one or more Counts.
+
+SYNAPSE
+-------
+A Synapse represents the association of a Signal with a Count. Signal
+data affects respective Count data, and the Synapse represents this
+relationship.
+
+The Synapse action mode specifies the Signal data condition that
+triggers the respective Count's count function evaluation to update the
+count data. The Generic Counter interface provides the following
+available action modes:
+
+* None:
+ Signal does not trigger the count function. In Pulse-Direction count
+ function mode, this Signal is evaluated as Direction.
+
+* Rising Edge:
+ Low state transitions to high state.
+
+* Falling Edge:
+ High state transitions to low state.
+
+* Both Edges:
+ Any state transition.
+
+A counter is defined as a set of input signals associated with count
+data that are generated by the evaluation of the state of the associated
+input signals as defined by the respective count functions. Within the
+context of the Generic Counter interface, a counter consists of Counts
+each associated with a set of Signals, whose respective Synapse
+instances represent the count function update conditions for the
+associated Counts.
+
+A Synapse associates one Signal with one Count.
+
+COUNT
+-----
+A Count represents the accumulation of the effects of connected
+Synapses; i.e. the count data for a set of Signals. The Generic
+Counter interface represents the count data as a natural number.
+
+A Count has a count function mode which represents the update behavior
+for the count data. The Generic Counter interface provides the following
+available count function modes:
+
+* Increase:
+ Accumulated count is incremented.
+
+* Decrease:
+ Accumulated count is decremented.
+
+* Pulse-Direction:
+ Rising edges on signal A updates the respective count. The input level
+ of signal B determines direction.
+
+* Quadrature:
+ A pair of quadrature encoding signals are evaluated to determine
+ position and direction. The following Quadrature modes are available:
+
+ - x1 A:
+ If direction is forward, rising edges on quadrature pair signal A
+ updates the respective count; if the direction is backward, falling
+ edges on quadrature pair signal A updates the respective count.
+ Quadrature encoding determines the direction.
+
+ - x1 B:
+ If direction is forward, rising edges on quadrature pair signal B
+ updates the respective count; if the direction is backward, falling
+ edges on quadrature pair signal B updates the respective count.
+ Quadrature encoding determines the direction.
+
+ - x2 A:
+ Any state transition on quadrature pair signal A updates the
+ respective count. Quadrature encoding determines the direction.
+
+ - x2 B:
+ Any state transition on quadrature pair signal B updates the
+ respective count. Quadrature encoding determines the direction.
+
+ - x4:
+ Any state transition on either quadrature pair signals updates the
+ respective count. Quadrature encoding determines the direction.
+
+A Count has a set of one or more associated Synapses.
+
+Paradigm
+========
+
+The most basic counter device may be expressed as a single Count
+associated with a single Signal via a single Synapse. Take for example
+a counter device which simply accumulates a count of rising edges on a
+source input line::
+
+ Count Synapse Signal
+ ----- ------- ------
+ +---------------------+
+ | Data: Count | Rising Edge ________
+ | Function: Increase | <------------- / Source \
+ | | ____________
+ +---------------------+
+
+In this example, the Signal is a source input line with a pulsing
+voltage, while the Count is a persistent count value which is repeatedly
+incremented. The Signal is associated with the respective Count via a
+Synapse. The increase function is triggered by the Signal data condition
+specified by the Synapse -- in this case a rising edge condition on the
+voltage input line. In summary, the counter device existence and
+behavior is aptly represented by respective Count, Signal, and Synapse
+components: a rising edge condition triggers an increase function on an
+accumulating count datum.
+
+A counter device is not limited to a single Signal; in fact, in theory
+many Signals may be associated with even a single Count. For example, a
+quadrature encoder counter device can keep track of position based on
+the states of two input lines::
+
+ Count Synapse Signal
+ ----- ------- ------
+ +-------------------------+
+ | Data: Position | Both Edges ___
+ | Function: Quadrature x4 | <------------ / A \
+ | | _______
+ | |
+ | | Both Edges ___
+ | | <------------ / B \
+ | | _______
+ +-------------------------+
+
+In this example, two Signals (quadrature encoder lines A and B) are
+associated with a single Count: a rising or falling edge on either A or
+B triggers the "Quadrature x4" function which determines the direction
+of movement and updates the respective position data. The "Quadrature
+x4" function is likely implemented in the hardware of the quadrature
+encoder counter device; the Count, Signals, and Synapses simply
+represent this hardware behavior and functionality.
+
+Signals associated with the same Count can have differing Synapse action
+mode conditions. For example, a quadrature encoder counter device
+operating in a non-quadrature Pulse-Direction mode could have one input
+line dedicated for movement and a second input line dedicated for
+direction::
+
+ Count Synapse Signal
+ ----- ------- ------
+ +---------------------------+
+ | Data: Position | Rising Edge ___
+ | Function: Pulse-Direction | <------------- / A \ (Movement)
+ | | _______
+ | |
+ | | None ___
+ | | <------------- / B \ (Direction)
+ | | _______
+ +---------------------------+
+
+Only Signal A triggers the "Pulse-Direction" update function, but the
+instantaneous state of Signal B is still required in order to know the
+direction so that the position data may be properly updated. Ultimately,
+both Signals are associated with the same Count via two respective
+Synapses, but only one Synapse has an active action mode condition which
+triggers the respective count function while the other is left with a
+"None" condition action mode to indicate its respective Signal's
+availability for state evaluation despite its non-triggering mode.
+
+Keep in mind that the Signal, Synapse, and Count are abstract
+representations which do not need to be closely married to their
+respective physical sources. This allows the user of a counter to
+divorce themselves from the nuances of physical components (such as
+whether an input line is differential or single-ended) and instead focus
+on the core idea of what the data and process represent (e.g. position
+as interpreted from quadrature encoding data).
+
+Driver API
+==========
+
+Driver authors may utilize the Generic Counter interface in their code
+by including the include/linux/counter.h header file. This header file
+provides several core data structures, function prototypes, and macros
+for defining a counter device.
+
+.. kernel-doc:: include/linux/counter.h
+ :internal:
+
+.. kernel-doc:: drivers/counter/counter-core.c
+ :export:
+
+.. kernel-doc:: drivers/counter/counter-chrdev.c
+ :export:
+
+Driver Implementation
+=====================
+
+To support a counter device, a driver must first allocate the available
+Counter Signals via counter_signal structures. These Signals should
+be stored as an array and set to the signals array member of an
+allocated counter_device structure before the Counter is registered to
+the system.
+
+Counter Counts may be allocated via counter_count structures, and
+respective Counter Signal associations (Synapses) made via
+counter_synapse structures. Associated counter_synapse structures are
+stored as an array and set to the synapses array member of the
+respective counter_count structure. These counter_count structures are
+set to the counts array member of an allocated counter_device structure
+before the Counter is registered to the system.
+
+Driver callbacks must be provided to the counter_device structure in
+order to communicate with the device: to read and write various Signals
+and Counts, and to set and get the "action mode" and "function mode" for
+various Synapses and Counts respectively.
+
+A counter_device structure is allocated using counter_alloc() and then
+registered to the system by passing it to the counter_add() function, and
+unregistered by passing it to the counter_unregister function. There are
+device managed variants of these functions: devm_counter_alloc() and
+devm_counter_add().
+
+The struct counter_comp structure is used to define counter extensions
+for Signals, Synapses, and Counts.
+
+The "type" member specifies the type of high-level data (e.g. BOOL,
+COUNT_DIRECTION, etc.) handled by this extension. The "``*_read``" and
+"``*_write``" members can then be set by the counter device driver with
+callbacks to handle that data using native C data types (i.e. u8, u64,
+etc.).
+
+Convenience macros such as ``COUNTER_COMP_COUNT_U64`` are provided for
+use by driver authors. In particular, driver authors are expected to use
+the provided macros for standard Counter subsystem attributes in order
+to maintain a consistent interface for userspace. For example, a counter
+device driver may define several standard attributes like so::
+
+ struct counter_comp count_ext[] = {
+ COUNTER_COMP_DIRECTION(count_direction_read),
+ COUNTER_COMP_ENABLE(count_enable_read, count_enable_write),
+ COUNTER_COMP_CEILING(count_ceiling_read, count_ceiling_write),
+ };
+
+This makes it simple to see, add, and modify the attributes that are
+supported by this driver ("direction", "enable", and "ceiling") and to
+maintain this code without getting lost in a web of struct braces.
+
+Callbacks must match the function type expected for the respective
+component or extension. These function types are defined in the struct
+counter_comp structure as the "``*_read``" and "``*_write``" union
+members.
+
+The corresponding callback prototypes for the extensions mentioned in
+the previous example above would be::
+
+ int count_direction_read(struct counter_device *counter,
+ struct counter_count *count,
+ enum counter_count_direction *direction);
+ int count_enable_read(struct counter_device *counter,
+ struct counter_count *count, u8 *enable);
+ int count_enable_write(struct counter_device *counter,
+ struct counter_count *count, u8 enable);
+ int count_ceiling_read(struct counter_device *counter,
+ struct counter_count *count, u64 *ceiling);
+ int count_ceiling_write(struct counter_device *counter,
+ struct counter_count *count, u64 ceiling);
+
+Determining the type of extension to create is a matter of scope.
+
+* Signal extensions are attributes that expose information/control
+ specific to a Signal. These types of attributes will exist under a
+ Signal's directory in sysfs.
+
+ For example, if you have an invert feature for a Signal, you can have
+ a Signal extension called "invert" that toggles that feature:
+ /sys/bus/counter/devices/counterX/signalY/invert
+
+* Count extensions are attributes that expose information/control
+ specific to a Count. These type of attributes will exist under a
+ Count's directory in sysfs.
+
+ For example, if you want to pause/unpause a Count from updating, you
+ can have a Count extension called "enable" that toggles such:
+ /sys/bus/counter/devices/counterX/countY/enable
+
+* Device extensions are attributes that expose information/control
+ non-specific to a particular Count or Signal. This is where you would
+ put your global features or other miscellaneous functionality.
+
+ For example, if your device has an overtemp sensor, you can report the
+ chip overheated via a device extension called "error_overtemp":
+ /sys/bus/counter/devices/counterX/error_overtemp
+
+Subsystem Architecture
+======================
+
+Counter drivers pass and take data natively (i.e. ``u8``, ``u64``, etc.)
+and the shared counter module handles the translation between the sysfs
+interface. This guarantees a standard userspace interface for all
+counter drivers, and enables a Generic Counter chrdev interface via a
+generalized device driver ABI.
+
+A high-level view of how a count value is passed down from a counter
+driver is exemplified by the following. The driver callbacks are first
+registered to the Counter core component for use by the Counter
+userspace interface components::
+
+ Driver callbacks registration:
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ +----------------------------+
+ | Counter device driver |
+ +----------------------------+
+ | Processes data from device |
+ +----------------------------+
+ |
+ -------------------
+ / driver callbacks /
+ -------------------
+ |
+ V
+ +----------------------+
+ | Counter core |
+ +----------------------+
+ | Routes device driver |
+ | callbacks to the |
+ | userspace interfaces |
+ +----------------------+
+ |
+ -------------------
+ / driver callbacks /
+ -------------------
+ |
+ +---------------+---------------+
+ | |
+ V V
+ +--------------------+ +---------------------+
+ | Counter sysfs | | Counter chrdev |
+ +--------------------+ +---------------------+
+ | Translates to the | | Translates to the |
+ | standard Counter | | standard Counter |
+ | sysfs output | | character device |
+ +--------------------+ +---------------------+
+
+Thereafter, data can be transferred directly between the Counter device
+driver and Counter userspace interface::
+
+ Count data request:
+ ~~~~~~~~~~~~~~~~~~~
+ ----------------------
+ / Counter device \
+ +----------------------+
+ | Count register: 0x28 |
+ +----------------------+
+ |
+ -----------------
+ / raw count data /
+ -----------------
+ |
+ V
+ +----------------------------+
+ | Counter device driver |
+ +----------------------------+
+ | Processes data from device |
+ |----------------------------|
+ | Type: u64 |
+ | Value: 42 |
+ +----------------------------+
+ |
+ ----------
+ / u64 /
+ ----------
+ |
+ +---------------+---------------+
+ | |
+ V V
+ +--------------------+ +---------------------+
+ | Counter sysfs | | Counter chrdev |
+ +--------------------+ +---------------------+
+ | Translates to the | | Translates to the |
+ | standard Counter | | standard Counter |
+ | sysfs output | | character device |
+ |--------------------| |---------------------|
+ | Type: const char * | | Type: u64 |
+ | Value: "42" | | Value: 42 |
+ +--------------------+ +---------------------+
+ | |
+ --------------- -----------------------
+ / const char * / / struct counter_event /
+ --------------- -----------------------
+ | |
+ | V
+ | +-----------+
+ | | read |
+ | +-----------+
+ | \ Count: 42 /
+ | -----------
+ |
+ V
+ +--------------------------------------------------+
+ | `/sys/bus/counter/devices/counterX/countY/count` |
+ +--------------------------------------------------+
+ \ Count: "42" /
+ --------------------------------------------------
+
+There are four primary components involved:
+
+Counter device driver
+---------------------
+Communicates with the hardware device to read/write data; e.g. counter
+drivers for quadrature encoders, timers, etc.
+
+Counter core
+------------
+Registers the counter device driver to the system so that the respective
+callbacks are called during userspace interaction.
+
+Counter sysfs
+-------------
+Translates counter data to the standard Counter sysfs interface format
+and vice versa.
+
+Please refer to the ``Documentation/ABI/testing/sysfs-bus-counter`` file
+for a detailed breakdown of the available Generic Counter interface
+sysfs attributes.
+
+Counter chrdev
+--------------
+Translates Counter events to the standard Counter character device; data
+is transferred via standard character device read calls, while Counter
+events are configured via ioctl calls.
+
+Sysfs Interface
+===============
+
+Several sysfs attributes are generated by the Generic Counter interface,
+and reside under the ``/sys/bus/counter/devices/counterX`` directory,
+where ``X`` is to the respective counter device id. Please see
+``Documentation/ABI/testing/sysfs-bus-counter`` for detailed information
+on each Generic Counter interface sysfs attribute.
+
+Through these sysfs attributes, programs and scripts may interact with
+the Generic Counter paradigm Counts, Signals, and Synapses of respective
+counter devices.
+
+Counter Character Device
+========================
+
+Counter character device nodes are created under the ``/dev`` directory
+as ``counterX``, where ``X`` is the respective counter device id.
+Defines for the standard Counter data types are exposed via the
+userspace ``include/uapi/linux/counter.h`` file.
+
+Counter events
+--------------
+Counter device drivers can support Counter events by utilizing the
+``counter_push_event`` function::
+
+ void counter_push_event(struct counter_device *const counter, const u8 event,
+ const u8 channel);
+
+The event id is specified by the ``event`` parameter; the event channel
+id is specified by the ``channel`` parameter. When this function is
+called, the Counter data associated with the respective event is
+gathered, and a ``struct counter_event`` is generated for each datum and
+pushed to userspace.
+
+Counter events can be configured by users to report various Counter
+data of interest. This can be conceptualized as a list of Counter
+component read calls to perform. For example:
+
+ +------------------------+------------------------+
+ | COUNTER_EVENT_OVERFLOW | COUNTER_EVENT_INDEX |
+ +========================+========================+
+ | Channel 0 | Channel 0 |
+ +------------------------+------------------------+
+ | * Count 0 | * Signal 0 |
+ | * Count 1 | * Signal 0 Extension 0 |
+ | * Signal 3 | * Extension 4 |
+ | * Count 4 Extension 2 +------------------------+
+ | * Signal 5 Extension 0 | Channel 1 |
+ | +------------------------+
+ | | * Signal 4 |
+ | | * Signal 4 Extension 0 |
+ | | * Count 7 |
+ +------------------------+------------------------+
+
+When ``counter_push_event(counter, COUNTER_EVENT_INDEX, 1)`` is called
+for example, it will go down the list for the ``COUNTER_EVENT_INDEX``
+event channel 1 and execute the read callbacks for Signal 4, Signal 4
+Extension 0, and Count 7 -- the data returned for each is pushed to a
+kfifo as a ``struct counter_event``, which userspace can retrieve via a
+standard read operation on the respective character device node.
+
+Userspace
+---------
+Userspace applications can configure Counter events via ioctl operations
+on the Counter character device node. There following ioctl codes are
+supported and provided by the ``linux/counter.h`` userspace header file:
+
+* :c:macro:`COUNTER_ADD_WATCH_IOCTL`
+
+* :c:macro:`COUNTER_ENABLE_EVENTS_IOCTL`
+
+* :c:macro:`COUNTER_DISABLE_EVENTS_IOCTL`
+
+To configure events to gather Counter data, users first populate a
+``struct counter_watch`` with the relevant event id, event channel id,
+and the information for the desired Counter component from which to
+read, and then pass it via the ``COUNTER_ADD_WATCH_IOCTL`` ioctl
+command.
+
+Note that an event can be watched without gathering Counter data by
+setting the ``component.type`` member equal to
+``COUNTER_COMPONENT_NONE``. With this configuration the Counter
+character device will simply populate the event timestamps for those
+respective ``struct counter_event`` elements and ignore the component
+value.
+
+The ``COUNTER_ADD_WATCH_IOCTL`` command will buffer these Counter
+watches. When ready, the ``COUNTER_ENABLE_EVENTS_IOCTL`` ioctl command
+may be used to activate these Counter watches.
+
+Userspace applications can then execute a ``read`` operation (optionally
+calling ``poll`` first) on the Counter character device node to retrieve
+``struct counter_event`` elements with the desired data.
diff --git a/Documentation/driver-api/gpio/board.rst b/Documentation/driver-api/gpio/board.rst
new file mode 100644
index 0000000000..b33aa04f21
--- /dev/null
+++ b/Documentation/driver-api/gpio/board.rst
@@ -0,0 +1,222 @@
+=============
+GPIO Mappings
+=============
+
+This document explains how GPIOs can be assigned to given devices and functions.
+
+Note that it only applies to the new descriptor-based interface. For a
+description of the deprecated integer-based GPIO interface please refer to
+legacy.rst (actually, there is no real mapping possible with the old
+interface; you just fetch an integer from somewhere and request the
+corresponding GPIO).
+
+All platforms can enable the GPIO library, but if the platform strictly
+requires GPIO functionality to be present, it needs to select GPIOLIB from its
+Kconfig. Then, how GPIOs are mapped depends on what the platform uses to
+describe its hardware layout. Currently, mappings can be defined through device
+tree, ACPI, and platform data.
+
+Device Tree
+-----------
+GPIOs can easily be mapped to devices and functions in the device tree. The
+exact way to do it depends on the GPIO controller providing the GPIOs, see the
+device tree bindings for your controller.
+
+GPIOs mappings are defined in the consumer device's node, in a property named
+<function>-gpios, where <function> is the function the driver will request
+through gpiod_get(). For example::
+
+ foo_device {
+ compatible = "acme,foo";
+ ...
+ led-gpios = <&gpio 15 GPIO_ACTIVE_HIGH>, /* red */
+ <&gpio 16 GPIO_ACTIVE_HIGH>, /* green */
+ <&gpio 17 GPIO_ACTIVE_HIGH>; /* blue */
+
+ power-gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+ };
+
+Properties named <function>-gpio are also considered valid and old bindings use
+it but are only supported for compatibility reasons and should not be used for
+newer bindings since it has been deprecated.
+
+This property will make GPIOs 15, 16 and 17 available to the driver under the
+"led" function, and GPIO 1 as the "power" GPIO::
+
+ struct gpio_desc *red, *green, *blue, *power;
+
+ red = gpiod_get_index(dev, "led", 0, GPIOD_OUT_HIGH);
+ green = gpiod_get_index(dev, "led", 1, GPIOD_OUT_HIGH);
+ blue = gpiod_get_index(dev, "led", 2, GPIOD_OUT_HIGH);
+
+ power = gpiod_get(dev, "power", GPIOD_OUT_HIGH);
+
+The led GPIOs will be active high, while the power GPIO will be active low (i.e.
+gpiod_is_active_low(power) will be true).
+
+The second parameter of the gpiod_get() functions, the con_id string, has to be
+the <function>-prefix of the GPIO suffixes ("gpios" or "gpio", automatically
+looked up by the gpiod functions internally) used in the device tree. With above
+"led-gpios" example, use the prefix without the "-" as con_id parameter: "led".
+
+Internally, the GPIO subsystem prefixes the GPIO suffix ("gpios" or "gpio")
+with the string passed in con_id to get the resulting string
+(``snprintf(... "%s-%s", con_id, gpio_suffixes[]``).
+
+ACPI
+----
+ACPI also supports function names for GPIOs in a similar fashion to DT.
+The above DT example can be converted to an equivalent ACPI description
+with the help of _DSD (Device Specific Data), introduced in ACPI 5.1::
+
+ Device (FOO) {
+ Name (_CRS, ResourceTemplate () {
+ GpioIo (Exclusive, PullUp, 0, 0, IoRestrictionOutputOnly,
+ "\\_SB.GPI0", 0, ResourceConsumer) { 15 } // red
+ GpioIo (Exclusive, PullUp, 0, 0, IoRestrictionOutputOnly,
+ "\\_SB.GPI0", 0, ResourceConsumer) { 16 } // green
+ GpioIo (Exclusive, PullUp, 0, 0, IoRestrictionOutputOnly,
+ "\\_SB.GPI0", 0, ResourceConsumer) { 17 } // blue
+ GpioIo (Exclusive, PullNone, 0, 0, IoRestrictionOutputOnly,
+ "\\_SB.GPI0", 0, ResourceConsumer) { 1 } // power
+ })
+
+ Name (_DSD, Package () {
+ ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+ Package () {
+ Package () {
+ "led-gpios",
+ Package () {
+ ^FOO, 0, 0, 1,
+ ^FOO, 1, 0, 1,
+ ^FOO, 2, 0, 1,
+ }
+ },
+ Package () { "power-gpios", Package () { ^FOO, 3, 0, 0 } },
+ }
+ })
+ }
+
+For more information about the ACPI GPIO bindings see
+Documentation/firmware-guide/acpi/gpio-properties.rst.
+
+Platform Data
+-------------
+Finally, GPIOs can be bound to devices and functions using platform data. Board
+files that desire to do so need to include the following header::
+
+ #include <linux/gpio/machine.h>
+
+GPIOs are mapped by the means of tables of lookups, containing instances of the
+gpiod_lookup structure. Two macros are defined to help declaring such mappings::
+
+ GPIO_LOOKUP(key, chip_hwnum, con_id, flags)
+ GPIO_LOOKUP_IDX(key, chip_hwnum, con_id, idx, flags)
+
+where
+
+ - key is either the label of the gpiod_chip instance providing the GPIO, or
+ the GPIO line name
+ - chip_hwnum is the hardware number of the GPIO within the chip, or U16_MAX
+ to indicate that key is a GPIO line name
+ - con_id is the name of the GPIO function from the device point of view. It
+ can be NULL, in which case it will match any function.
+ - idx is the index of the GPIO within the function.
+ - flags is defined to specify the following properties:
+ * GPIO_ACTIVE_HIGH - GPIO line is active high
+ * GPIO_ACTIVE_LOW - GPIO line is active low
+ * GPIO_OPEN_DRAIN - GPIO line is set up as open drain
+ * GPIO_OPEN_SOURCE - GPIO line is set up as open source
+ * GPIO_PERSISTENT - GPIO line is persistent during
+ suspend/resume and maintains its value
+ * GPIO_TRANSITORY - GPIO line is transitory and may loose its
+ electrical state during suspend/resume
+
+In the future, these flags might be extended to support more properties.
+
+Note that:
+ 1. GPIO line names are not guaranteed to be globally unique, so the first
+ match found will be used.
+ 2. GPIO_LOOKUP() is just a shortcut to GPIO_LOOKUP_IDX() where idx = 0.
+
+A lookup table can then be defined as follows, with an empty entry defining its
+end. The 'dev_id' field of the table is the identifier of the device that will
+make use of these GPIOs. It can be NULL, in which case it will be matched for
+calls to gpiod_get() with a NULL device.
+
+.. code-block:: c
+
+ struct gpiod_lookup_table gpios_table = {
+ .dev_id = "foo.0",
+ .table = {
+ GPIO_LOOKUP_IDX("gpio.0", 15, "led", 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("gpio.0", 16, "led", 1, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("gpio.0", 17, "led", 2, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP("gpio.0", 1, "power", GPIO_ACTIVE_LOW),
+ { },
+ },
+ };
+
+And the table can be added by the board code as follows::
+
+ gpiod_add_lookup_table(&gpios_table);
+
+The driver controlling "foo.0" will then be able to obtain its GPIOs as follows::
+
+ struct gpio_desc *red, *green, *blue, *power;
+
+ red = gpiod_get_index(dev, "led", 0, GPIOD_OUT_HIGH);
+ green = gpiod_get_index(dev, "led", 1, GPIOD_OUT_HIGH);
+ blue = gpiod_get_index(dev, "led", 2, GPIOD_OUT_HIGH);
+
+ power = gpiod_get(dev, "power", GPIOD_OUT_HIGH);
+
+Since the "led" GPIOs are mapped as active-high, this example will switch their
+signals to 1, i.e. enabling the LEDs. And for the "power" GPIO, which is mapped
+as active-low, its actual signal will be 0 after this code. Contrary to the
+legacy integer GPIO interface, the active-low property is handled during
+mapping and is thus transparent to GPIO consumers.
+
+A set of functions such as gpiod_set_value() is available to work with
+the new descriptor-oriented interface.
+
+Boards using platform data can also hog GPIO lines by defining GPIO hog tables.
+
+.. code-block:: c
+
+ struct gpiod_hog gpio_hog_table[] = {
+ GPIO_HOG("gpio.0", 10, "foo", GPIO_ACTIVE_LOW, GPIOD_OUT_HIGH),
+ { }
+ };
+
+And the table can be added to the board code as follows::
+
+ gpiod_add_hogs(gpio_hog_table);
+
+The line will be hogged as soon as the gpiochip is created or - in case the
+chip was created earlier - when the hog table is registered.
+
+Arrays of pins
+--------------
+In addition to requesting pins belonging to a function one by one, a device may
+also request an array of pins assigned to the function. The way those pins are
+mapped to the device determines if the array qualifies for fast bitmap
+processing. If yes, a bitmap is passed over get/set array functions directly
+between a caller and a respective .get/set_multiple() callback of a GPIO chip.
+
+In order to qualify for fast bitmap processing, the array must meet the
+following requirements:
+
+- pin hardware number of array member 0 must also be 0,
+- pin hardware numbers of consecutive array members which belong to the same
+ chip as member 0 does must also match their array indexes.
+
+Otherwise fast bitmap processing path is not used in order to avoid consecutive
+pins which belong to the same chip but are not in hardware order being processed
+separately.
+
+If the array applies for fast bitmap processing path, pins which belong to
+different chips than member 0 does, as well as those with indexes different from
+their hardware pin numbers, are excluded from the fast path, both input and
+output. Moreover, open drain and open source pins are excluded from fast bitmap
+output processing.
diff --git a/Documentation/driver-api/gpio/bt8xxgpio.rst b/Documentation/driver-api/gpio/bt8xxgpio.rst
new file mode 100644
index 0000000000..d7e75f1234
--- /dev/null
+++ b/Documentation/driver-api/gpio/bt8xxgpio.rst
@@ -0,0 +1,62 @@
+===================================================================
+A driver for a selfmade cheap BT8xx based PCI GPIO-card (bt8xxgpio)
+===================================================================
+
+For advanced documentation, see https://bues.ch/cms/unmaintained/btgpio.html
+
+A generic digital 24-port PCI GPIO card can be built out of an ordinary
+Brooktree bt848, bt849, bt878 or bt879 based analog TV tuner card. The
+Brooktree chip is used in old analog Hauppauge WinTV PCI cards. You can easily
+find them used for low prices on the net.
+
+The bt8xx chip does have 24 digital GPIO ports.
+These ports are accessible via 24 pins on the SMD chip package.
+
+
+How to physically access the GPIO pins
+======================================
+
+The are several ways to access these pins. One might unsolder the whole chip
+and put it on a custom PCI board, or one might only unsolder each individual
+GPIO pin and solder that to some tiny wire. As the chip package really is tiny
+there are some advanced soldering skills needed in any case.
+
+The physical pinouts are drawn in the following ASCII art.
+The GPIO pins are marked with G00-G23::
+
+ G G G G G G G G G G G G G G G G G G
+ 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7
+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
+ ---------------------------------------------------------------------------
+ --| ^ ^ |--
+ --| pin 86 pin 67 |--
+ --| |--
+ --| pin 61 > |-- G18
+ --| |-- G19
+ --| |-- G20
+ --| |-- G21
+ --| |-- G22
+ --| pin 56 > |-- G23
+ --| |--
+ --| Brooktree 878/879 |--
+ --| |--
+ --| |--
+ --| |--
+ --| |--
+ --| |--
+ --| |--
+ --| |--
+ --| |--
+ --| |--
+ --| |--
+ --| |--
+ --| |--
+ --| |--
+ --| O |--
+ --| |--
+ ---------------------------------------------------------------------------
+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
+ ^
+ This is pin 1
+
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
new file mode 100644
index 0000000000..de6fc79ad6
--- /dev/null
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -0,0 +1,468 @@
+==================================
+GPIO Descriptor Consumer Interface
+==================================
+
+This document describes the consumer interface of the GPIO framework. Note that
+it describes the new descriptor-based interface. For a description of the
+deprecated integer-based GPIO interface please refer to legacy.rst.
+
+
+Guidelines for GPIOs consumers
+==============================
+
+Drivers that can't work without standard GPIO calls should have Kconfig entries
+that depend on GPIOLIB or select GPIOLIB. The functions that allow a driver to
+obtain and use GPIOs are available by including the following file::
+
+ #include <linux/gpio/consumer.h>
+
+There are static inline stubs for all functions in the header file in the case
+where GPIOLIB is disabled. When these stubs are called they will emit
+warnings. These stubs are used for two use cases:
+
+- Simple compile coverage with e.g. COMPILE_TEST - it does not matter that
+ the current platform does not enable or select GPIOLIB because we are not
+ going to execute the system anyway.
+
+- Truly optional GPIOLIB support - where the driver does not really make use
+ of the GPIOs on certain compile-time configurations for certain systems, but
+ will use it under other compile-time configurations. In this case the
+ consumer must make sure not to call into these functions, or the user will
+ be met with console warnings that may be perceived as intimidating.
+
+All the functions that work with the descriptor-based GPIO interface are
+prefixed with ``gpiod_``. The ``gpio_`` prefix is used for the legacy
+interface. No other function in the kernel should use these prefixes. The use
+of the legacy functions is strongly discouraged, new code should use
+<linux/gpio/consumer.h> and descriptors exclusively.
+
+
+Obtaining and Disposing GPIOs
+=============================
+
+With the descriptor-based interface, GPIOs are identified with an opaque,
+non-forgeable handler that must be obtained through a call to one of the
+gpiod_get() functions. Like many other kernel subsystems, gpiod_get() takes the
+device that will use the GPIO and the function the requested GPIO is supposed to
+fulfill::
+
+ struct gpio_desc *gpiod_get(struct device *dev, const char *con_id,
+ enum gpiod_flags flags)
+
+If a function is implemented by using several GPIOs together (e.g. a simple LED
+device that displays digits), an additional index argument can be specified::
+
+ struct gpio_desc *gpiod_get_index(struct device *dev,
+ const char *con_id, unsigned int idx,
+ enum gpiod_flags flags)
+
+For a more detailed description of the con_id parameter in the DeviceTree case
+see Documentation/driver-api/gpio/board.rst
+
+The flags parameter is used to optionally specify a direction and initial value
+for the GPIO. Values can be:
+
+* GPIOD_ASIS or 0 to not initialize the GPIO at all. The direction must be set
+ later with one of the dedicated functions.
+* GPIOD_IN to initialize the GPIO as input.
+* GPIOD_OUT_LOW to initialize the GPIO as output with a value of 0.
+* GPIOD_OUT_HIGH to initialize the GPIO as output with a value of 1.
+* GPIOD_OUT_LOW_OPEN_DRAIN same as GPIOD_OUT_LOW but also enforce the line
+ to be electrically used with open drain.
+* GPIOD_OUT_HIGH_OPEN_DRAIN same as GPIOD_OUT_HIGH but also enforce the line
+ to be electrically used with open drain.
+
+Note that the initial value is *logical* and the physical line level depends on
+whether the line is configured active high or active low (see
+:ref:`active_low_semantics`).
+
+The two last flags are used for use cases where open drain is mandatory, such
+as I2C: if the line is not already configured as open drain in the mappings
+(see board.rst), then open drain will be enforced anyway and a warning will be
+printed that the board configuration needs to be updated to match the use case.
+
+Both functions return either a valid GPIO descriptor, or an error code checkable
+with IS_ERR() (they will never return a NULL pointer). -ENOENT will be returned
+if and only if no GPIO has been assigned to the device/function/index triplet,
+other error codes are used for cases where a GPIO has been assigned but an error
+occurred while trying to acquire it. This is useful to discriminate between mere
+errors and an absence of GPIO for optional GPIO parameters. For the common
+pattern where a GPIO is optional, the gpiod_get_optional() and
+gpiod_get_index_optional() functions can be used. These functions return NULL
+instead of -ENOENT if no GPIO has been assigned to the requested function::
+
+ struct gpio_desc *gpiod_get_optional(struct device *dev,
+ const char *con_id,
+ enum gpiod_flags flags)
+
+ struct gpio_desc *gpiod_get_index_optional(struct device *dev,
+ const char *con_id,
+ unsigned int index,
+ enum gpiod_flags flags)
+
+Note that gpio_get*_optional() functions (and their managed variants), unlike
+the rest of gpiolib API, also return NULL when gpiolib support is disabled.
+This is helpful to driver authors, since they do not need to special case
+-ENOSYS return codes. System integrators should however be careful to enable
+gpiolib on systems that need it.
+
+For a function using multiple GPIOs all of those can be obtained with one call::
+
+ struct gpio_descs *gpiod_get_array(struct device *dev,
+ const char *con_id,
+ enum gpiod_flags flags)
+
+This function returns a struct gpio_descs which contains an array of
+descriptors. It also contains a pointer to a gpiolib private structure which,
+if passed back to get/set array functions, may speed up I/O processing::
+
+ struct gpio_descs {
+ struct gpio_array *info;
+ unsigned int ndescs;
+ struct gpio_desc *desc[];
+ }
+
+The following function returns NULL instead of -ENOENT if no GPIOs have been
+assigned to the requested function::
+
+ struct gpio_descs *gpiod_get_array_optional(struct device *dev,
+ const char *con_id,
+ enum gpiod_flags flags)
+
+Device-managed variants of these functions are also defined::
+
+ struct gpio_desc *devm_gpiod_get(struct device *dev, const char *con_id,
+ enum gpiod_flags flags)
+
+ struct gpio_desc *devm_gpiod_get_index(struct device *dev,
+ const char *con_id,
+ unsigned int idx,
+ enum gpiod_flags flags)
+
+ struct gpio_desc *devm_gpiod_get_optional(struct device *dev,
+ const char *con_id,
+ enum gpiod_flags flags)
+
+ struct gpio_desc *devm_gpiod_get_index_optional(struct device *dev,
+ const char *con_id,
+ unsigned int index,
+ enum gpiod_flags flags)
+
+ struct gpio_descs *devm_gpiod_get_array(struct device *dev,
+ const char *con_id,
+ enum gpiod_flags flags)
+
+ struct gpio_descs *devm_gpiod_get_array_optional(struct device *dev,
+ const char *con_id,
+ enum gpiod_flags flags)
+
+A GPIO descriptor can be disposed of using the gpiod_put() function::
+
+ void gpiod_put(struct gpio_desc *desc)
+
+For an array of GPIOs this function can be used::
+
+ void gpiod_put_array(struct gpio_descs *descs)
+
+It is strictly forbidden to use a descriptor after calling these functions.
+It is also not allowed to individually release descriptors (using gpiod_put())
+from an array acquired with gpiod_get_array().
+
+The device-managed variants are, unsurprisingly::
+
+ void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
+
+ void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs)
+
+
+Using GPIOs
+===========
+
+Setting Direction
+-----------------
+The first thing a driver must do with a GPIO is setting its direction. If no
+direction-setting flags have been given to gpiod_get*(), this is done by
+invoking one of the gpiod_direction_*() functions::
+
+ int gpiod_direction_input(struct gpio_desc *desc)
+ int gpiod_direction_output(struct gpio_desc *desc, int value)
+
+The return value is zero for success, else a negative errno. It should be
+checked, since the get/set calls don't return errors and since misconfiguration
+is possible. You should normally issue these calls from a task context. However,
+for spinlock-safe GPIOs it is OK to use them before tasking is enabled, as part
+of early board setup.
+
+For output GPIOs, the value provided becomes the initial output value. This
+helps avoid signal glitching during system startup.
+
+A driver can also query the current direction of a GPIO::
+
+ int gpiod_get_direction(const struct gpio_desc *desc)
+
+This function returns 0 for output, 1 for input, or an error code in case of error.
+
+Be aware that there is no default direction for GPIOs. Therefore, **using a GPIO
+without setting its direction first is illegal and will result in undefined
+behavior!**
+
+
+Spinlock-Safe GPIO Access
+-------------------------
+Most GPIO controllers can be accessed with memory read/write instructions. Those
+don't need to sleep, and can safely be done from inside hard (non-threaded) IRQ
+handlers and similar contexts.
+
+Use the following calls to access GPIOs from an atomic context::
+
+ int gpiod_get_value(const struct gpio_desc *desc);
+ void gpiod_set_value(struct gpio_desc *desc, int value);
+
+The values are boolean, zero for low, nonzero for high. When reading the value
+of an output pin, the value returned should be what's seen on the pin. That
+won't always match the specified output value, because of issues including
+open-drain signaling and output latencies.
+
+The get/set calls do not return errors because "invalid GPIO" should have been
+reported earlier from gpiod_direction_*(). However, note that not all platforms
+can read the value of output pins; those that can't should always return zero.
+Also, using these calls for GPIOs that can't safely be accessed without sleeping
+(see below) is an error.
+
+
+GPIO Access That May Sleep
+--------------------------
+Some GPIO controllers must be accessed using message based buses like I2C or
+SPI. Commands to read or write those GPIO values require waiting to get to the
+head of a queue to transmit a command and get its response. This requires
+sleeping, which can't be done from inside IRQ handlers.
+
+Platforms that support this type of GPIO distinguish them from other GPIOs by
+returning nonzero from this call::
+
+ int gpiod_cansleep(const struct gpio_desc *desc)
+
+To access such GPIOs, a different set of accessors is defined::
+
+ int gpiod_get_value_cansleep(const struct gpio_desc *desc)
+ void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
+
+Accessing such GPIOs requires a context which may sleep, for example a threaded
+IRQ handler, and those accessors must be used instead of spinlock-safe
+accessors without the cansleep() name suffix.
+
+Other than the fact that these accessors might sleep, and will work on GPIOs
+that can't be accessed from hardIRQ handlers, these calls act the same as the
+spinlock-safe calls.
+
+
+.. _active_low_semantics:
+
+The active low and open drain semantics
+---------------------------------------
+As a consumer should not have to care about the physical line level, all of the
+gpiod_set_value_xxx() or gpiod_set_array_value_xxx() functions operate with
+the *logical* value. With this they take the active low property into account.
+This means that they check whether the GPIO is configured to be active low,
+and if so, they manipulate the passed value before the physical line level is
+driven.
+
+The same is applicable for open drain or open source output lines: those do not
+actively drive their output high (open drain) or low (open source), they just
+switch their output to a high impedance value. The consumer should not need to
+care. (For details read about open drain in driver.rst.)
+
+With this, all the gpiod_set_(array)_value_xxx() functions interpret the
+parameter "value" as "asserted" ("1") or "de-asserted" ("0"). The physical line
+level will be driven accordingly.
+
+As an example, if the active low property for a dedicated GPIO is set, and the
+gpiod_set_(array)_value_xxx() passes "asserted" ("1"), the physical line level
+will be driven low.
+
+To summarize::
+
+ Function (example) line property physical line
+ gpiod_set_raw_value(desc, 0); don't care low
+ gpiod_set_raw_value(desc, 1); don't care high
+ gpiod_set_value(desc, 0); default (active high) low
+ gpiod_set_value(desc, 1); default (active high) high
+ gpiod_set_value(desc, 0); active low high
+ gpiod_set_value(desc, 1); active low low
+ gpiod_set_value(desc, 0); open drain low
+ gpiod_set_value(desc, 1); open drain high impedance
+ gpiod_set_value(desc, 0); open source high impedance
+ gpiod_set_value(desc, 1); open source high
+
+It is possible to override these semantics using the set_raw/get_raw functions
+but it should be avoided as much as possible, especially by system-agnostic drivers
+which should not need to care about the actual physical line level and worry about
+the logical value instead.
+
+
+Accessing raw GPIO values
+-------------------------
+Consumers exist that need to manage the logical state of a GPIO line, i.e. the value
+their device will actually receive, no matter what lies between it and the GPIO
+line.
+
+The following set of calls ignore the active-low or open drain property of a GPIO and
+work on the raw line value::
+
+ int gpiod_get_raw_value(const struct gpio_desc *desc)
+ void gpiod_set_raw_value(struct gpio_desc *desc, int value)
+ int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
+ void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value)
+ int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
+
+The active low state of a GPIO can also be queried and toggled using the
+following calls::
+
+ int gpiod_is_active_low(const struct gpio_desc *desc)
+ void gpiod_toggle_active_low(struct gpio_desc *desc)
+
+Note that these functions should only be used with great moderation; a driver
+should not have to care about the physical line level or open drain semantics.
+
+
+Access multiple GPIOs with a single function call
+-------------------------------------------------
+The following functions get or set the values of an array of GPIOs::
+
+ int gpiod_get_array_value(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
+ unsigned long *value_bitmap);
+ int gpiod_get_raw_array_value(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
+ unsigned long *value_bitmap);
+ int gpiod_get_array_value_cansleep(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
+ unsigned long *value_bitmap);
+ int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
+ unsigned long *value_bitmap);
+
+ int gpiod_set_array_value(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
+ unsigned long *value_bitmap)
+ int gpiod_set_raw_array_value(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
+ unsigned long *value_bitmap)
+ int gpiod_set_array_value_cansleep(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
+ unsigned long *value_bitmap)
+ int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
+ struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
+ unsigned long *value_bitmap)
+
+The array can be an arbitrary set of GPIOs. The functions will try to access
+GPIOs belonging to the same bank or chip simultaneously if supported by the
+corresponding chip driver. In that case a significantly improved performance
+can be expected. If simultaneous access is not possible the GPIOs will be
+accessed sequentially.
+
+The functions take four arguments:
+
+ * array_size - the number of array elements
+ * desc_array - an array of GPIO descriptors
+ * array_info - optional information obtained from gpiod_get_array()
+ * value_bitmap - a bitmap to store the GPIOs' values (get) or
+ a bitmap of values to assign to the GPIOs (set)
+
+The descriptor array can be obtained using the gpiod_get_array() function
+or one of its variants. If the group of descriptors returned by that function
+matches the desired group of GPIOs, those GPIOs can be accessed by simply using
+the struct gpio_descs returned by gpiod_get_array()::
+
+ struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
+ gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
+ my_gpio_descs->info, my_gpio_value_bitmap);
+
+It is also possible to access a completely arbitrary array of descriptors. The
+descriptors may be obtained using any combination of gpiod_get() and
+gpiod_get_array(). Afterwards the array of descriptors has to be setup
+manually before it can be passed to one of the above functions. In that case,
+array_info should be set to NULL.
+
+Note that for optimal performance GPIOs belonging to the same chip should be
+contiguous within the array of descriptors.
+
+Still better performance may be achieved if array indexes of the descriptors
+match hardware pin numbers of a single chip. If an array passed to a get/set
+array function matches the one obtained from gpiod_get_array() and array_info
+associated with the array is also passed, the function may take a fast bitmap
+processing path, passing the value_bitmap argument directly to the respective
+.get/set_multiple() callback of the chip. That allows for utilization of GPIO
+banks as data I/O ports without much loss of performance.
+
+The return value of gpiod_get_array_value() and its variants is 0 on success
+or negative on error. Note the difference to gpiod_get_value(), which returns
+0 or 1 on success to convey the GPIO value. With the array functions, the GPIO
+values are stored in value_array rather than passed back as return value.
+
+
+GPIOs mapped to IRQs
+--------------------
+GPIO lines can quite often be used as IRQs. You can get the IRQ number
+corresponding to a given GPIO using the following call::
+
+ int gpiod_to_irq(const struct gpio_desc *desc)
+
+It will return an IRQ number, or a negative errno code if the mapping can't be
+done (most likely because that particular GPIO cannot be used as IRQ). It is an
+unchecked error to use a GPIO that wasn't set up as an input using
+gpiod_direction_input(), or to use an IRQ number that didn't originally come
+from gpiod_to_irq(). gpiod_to_irq() is not allowed to sleep.
+
+Non-error values returned from gpiod_to_irq() can be passed to request_irq() or
+free_irq(). They will often be stored into IRQ resources for platform devices,
+by the board-specific initialization code. Note that IRQ trigger options are
+part of the IRQ interface, e.g. IRQF_TRIGGER_FALLING, as are system wakeup
+capabilities.
+
+
+GPIOs and ACPI
+==============
+
+On ACPI systems, GPIOs are described by GpioIo()/GpioInt() resources listed by
+the _CRS configuration objects of devices. Those resources do not provide
+connection IDs (names) for GPIOs, so it is necessary to use an additional
+mechanism for this purpose.
+
+Systems compliant with ACPI 5.1 or newer may provide a _DSD configuration object
+which, among other things, may be used to provide connection IDs for specific
+GPIOs described by the GpioIo()/GpioInt() resources in _CRS. If that is the
+case, it will be handled by the GPIO subsystem automatically. However, if the
+_DSD is not present, the mappings between GpioIo()/GpioInt() resources and GPIO
+connection IDs need to be provided by device drivers.
+
+For details refer to Documentation/firmware-guide/acpi/gpio-properties.rst
+
+
+Interacting With the Legacy GPIO Subsystem
+==========================================
+Many kernel subsystems and drivers still handle GPIOs using the legacy
+integer-based interface. It is strongly recommended to update these to the new
+gpiod interface. For cases where both interfaces need to be used, the following
+two functions allow to convert a GPIO descriptor into the GPIO integer namespace
+and vice-versa::
+
+ int desc_to_gpio(const struct gpio_desc *desc)
+ struct gpio_desc *gpio_to_desc(unsigned gpio)
+
+The GPIO number returned by desc_to_gpio() can safely be used as a parameter of
+the gpio\_*() functions for as long as the GPIO descriptor `desc` is not freed.
+All the same, a GPIO number passed to gpio_to_desc() must first be properly
+acquired using e.g. gpio_request_one(), and the returned GPIO descriptor is only
+considered valid until that GPIO number is released using gpio_free().
+
+Freeing a GPIO obtained by one API with the other API is forbidden and an
+unchecked error.
diff --git a/Documentation/driver-api/gpio/driver.rst b/Documentation/driver-api/gpio/driver.rst
new file mode 100644
index 0000000000..bf6319cc53
--- /dev/null
+++ b/Documentation/driver-api/gpio/driver.rst
@@ -0,0 +1,778 @@
+=====================
+GPIO Driver Interface
+=====================
+
+This document serves as a guide for writers of GPIO chip drivers.
+
+Each GPIO controller driver needs to include the following header, which defines
+the structures used to define a GPIO driver::
+
+ #include <linux/gpio/driver.h>
+
+
+Internal Representation of GPIOs
+================================
+
+A GPIO chip handles one or more GPIO lines. To be considered a GPIO chip, the
+lines must conform to the definition: General Purpose Input/Output. If the
+line is not general purpose, it is not GPIO and should not be handled by a
+GPIO chip. The use case is the indicative: certain lines in a system may be
+called GPIO but serve a very particular purpose thus not meeting the criteria
+of a general purpose I/O. On the other hand a LED driver line may be used as a
+GPIO and should therefore still be handled by a GPIO chip driver.
+
+Inside a GPIO driver, individual GPIO lines are identified by their hardware
+number, sometime also referred to as ``offset``, which is a unique number
+between 0 and n-1, n being the number of GPIOs managed by the chip.
+
+The hardware GPIO number should be something intuitive to the hardware, for
+example if a system uses a memory-mapped set of I/O-registers where 32 GPIO
+lines are handled by one bit per line in a 32-bit register, it makes sense to
+use hardware offsets 0..31 for these, corresponding to bits 0..31 in the
+register.
+
+This number is purely internal: the hardware number of a particular GPIO
+line is never made visible outside of the driver.
+
+On top of this internal number, each GPIO line also needs to have a global
+number in the integer GPIO namespace so that it can be used with the legacy GPIO
+interface. Each chip must thus have a "base" number (which can be automatically
+assigned), and for each GPIO line the global number will be (base + hardware
+number). Although the integer representation is considered deprecated, it still
+has many users and thus needs to be maintained.
+
+So for example one platform could use global numbers 32-159 for GPIOs, with a
+controller defining 128 GPIOs at a "base" of 32 ; while another platform uses
+global numbers 0..63 with one set of GPIO controllers, 64-79 with another type
+of GPIO controller, and on one particular board 80-95 with an FPGA. The legacy
+numbers need not be contiguous; either of those platforms could also use numbers
+2000-2063 to identify GPIO lines in a bank of I2C GPIO expanders.
+
+
+Controller Drivers: gpio_chip
+=============================
+
+In the gpiolib framework each GPIO controller is packaged as a "struct
+gpio_chip" (see <linux/gpio/driver.h> for its complete definition) with members
+common to each controller of that type, these should be assigned by the
+driver code:
+
+ - methods to establish GPIO line direction
+ - methods used to access GPIO line values
+ - method to set electrical configuration for a given GPIO line
+ - method to return the IRQ number associated to a given GPIO line
+ - flag saying whether calls to its methods may sleep
+ - optional line names array to identify lines
+ - optional debugfs dump method (showing extra state information)
+ - optional base number (will be automatically assigned if omitted)
+ - optional label for diagnostics and GPIO chip mapping using platform data
+
+The code implementing a gpio_chip should support multiple instances of the
+controller, preferably using the driver model. That code will configure each
+gpio_chip and issue gpiochip_add(), gpiochip_add_data(), or
+devm_gpiochip_add_data(). Removing a GPIO controller should be rare; use
+gpiochip_remove() when it is unavoidable.
+
+Often a gpio_chip is part of an instance-specific structure with states not
+exposed by the GPIO interfaces, such as addressing, power management, and more.
+Chips such as audio codecs will have complex non-GPIO states.
+
+Any debugfs dump method should normally ignore lines which haven't been
+requested. They can use gpiochip_is_requested(), which returns either
+NULL or the label associated with that GPIO line when it was requested.
+
+Realtime considerations: the GPIO driver should not use spinlock_t or any
+sleepable APIs (like PM runtime) in its gpio_chip implementation (.get/.set
+and direction control callbacks) if it is expected to call GPIO APIs from
+atomic context on realtime kernels (inside hard IRQ handlers and similar
+contexts). Normally this should not be required.
+
+
+GPIO electrical configuration
+-----------------------------
+
+GPIO lines can be configured for several electrical modes of operation by using
+the .set_config() callback. Currently this API supports setting:
+
+- Debouncing
+- Single-ended modes (open drain/open source)
+- Pull up and pull down resistor enablement
+
+These settings are described below.
+
+The .set_config() callback uses the same enumerators and configuration
+semantics as the generic pin control drivers. This is not a coincidence: it is
+possible to assign the .set_config() to the function gpiochip_generic_config()
+which will result in pinctrl_gpio_set_config() being called and eventually
+ending up in the pin control back-end "behind" the GPIO controller, usually
+closer to the actual pins. This way the pin controller can manage the below
+listed GPIO configurations.
+
+If a pin controller back-end is used, the GPIO controller or hardware
+description needs to provide "GPIO ranges" mapping the GPIO line offsets to pin
+numbers on the pin controller so they can properly cross-reference each other.
+
+
+GPIO lines with debounce support
+--------------------------------
+
+Debouncing is a configuration set to a pin indicating that it is connected to
+a mechanical switch or button, or similar that may bounce. Bouncing means the
+line is pulled high/low quickly at very short intervals for mechanical
+reasons. This can result in the value being unstable or irqs firing repeatedly
+unless the line is debounced.
+
+Debouncing in practice involves setting up a timer when something happens on
+the line, wait a little while and then sample the line again, so see if it
+still has the same value (low or high). This could also be repeated by a clever
+state machine, waiting for a line to become stable. In either case, it sets
+a certain number of milliseconds for debouncing, or just "on/off" if that time
+is not configurable.
+
+
+GPIO lines with open drain/source support
+-----------------------------------------
+
+Open drain (CMOS) or open collector (TTL) means the line is not actively driven
+high: instead you provide the drain/collector as output, so when the transistor
+is not open, it will present a high-impedance (tristate) to the external rail::
+
+
+ CMOS CONFIGURATION TTL CONFIGURATION
+
+ ||--- out +--- out
+ in ----|| |/
+ ||--+ in ----|
+ | |\
+ GND GND
+
+This configuration is normally used as a way to achieve one of two things:
+
+- Level-shifting: to reach a logical level higher than that of the silicon
+ where the output resides.
+
+- Inverse wire-OR on an I/O line, for example a GPIO line, making it possible
+ for any driving stage on the line to drive it low even if any other output
+ to the same line is simultaneously driving it high. A special case of this
+ is driving the SCL and SDA lines of an I2C bus, which is by definition a
+ wire-OR bus.
+
+Both use cases require that the line be equipped with a pull-up resistor. This
+resistor will make the line tend to high level unless one of the transistors on
+the rail actively pulls it down.
+
+The level on the line will go as high as the VDD on the pull-up resistor, which
+may be higher than the level supported by the transistor, achieving a
+level-shift to the higher VDD.
+
+Integrated electronics often have an output driver stage in the form of a CMOS
+"totem-pole" with one N-MOS and one P-MOS transistor where one of them drives
+the line high and one of them drives the line low. This is called a push-pull
+output. The "totem-pole" looks like so::
+
+ VDD
+ |
+ OD ||--+
+ +--/ ---o|| P-MOS-FET
+ | ||--+
+ IN --+ +----- out
+ | ||--+
+ +--/ ----|| N-MOS-FET
+ OS ||--+
+ |
+ GND
+
+The desired output signal (e.g. coming directly from some GPIO output register)
+arrives at IN. The switches named "OD" and "OS" are normally closed, creating
+a push-pull circuit.
+
+Consider the little "switches" named "OD" and "OS" that enable/disable the
+P-MOS or N-MOS transistor right after the split of the input. As you can see,
+either transistor will go totally numb if this switch is open. The totem-pole
+is then halved and give high impedance instead of actively driving the line
+high or low respectively. That is usually how software-controlled open
+drain/source works.
+
+Some GPIO hardware come in open drain / open source configuration. Some are
+hard-wired lines that will only support open drain or open source no matter
+what: there is only one transistor there. Some are software-configurable:
+by flipping a bit in a register the output can be configured as open drain
+or open source, in practice by flicking open the switches labeled "OD" and "OS"
+in the drawing above.
+
+By disabling the P-MOS transistor, the output can be driven between GND and
+high impedance (open drain), and by disabling the N-MOS transistor, the output
+can be driven between VDD and high impedance (open source). In the first case,
+a pull-up resistor is needed on the outgoing rail to complete the circuit, and
+in the second case, a pull-down resistor is needed on the rail.
+
+Hardware that supports open drain or open source or both, can implement a
+special callback in the gpio_chip: .set_config() that takes a generic
+pinconf packed value telling whether to configure the line as open drain,
+open source or push-pull. This will happen in response to the
+GPIO_OPEN_DRAIN or GPIO_OPEN_SOURCE flag set in the machine file, or coming
+from other hardware descriptions.
+
+If this state can not be configured in hardware, i.e. if the GPIO hardware does
+not support open drain/open source in hardware, the GPIO library will instead
+use a trick: when a line is set as output, if the line is flagged as open
+drain, and the IN output value is low, it will be driven low as usual. But
+if the IN output value is set to high, it will instead *NOT* be driven high,
+instead it will be switched to input, as input mode is an equivalent to
+high impedance, thus achieving an "open drain emulation" of sorts: electrically
+the behaviour will be identical, with the exception of possible hardware glitches
+when switching the mode of the line.
+
+For open source configuration the same principle is used, just that instead
+of actively driving the line low, it is set to input.
+
+
+GPIO lines with pull up/down resistor support
+---------------------------------------------
+
+A GPIO line can support pull-up/down using the .set_config() callback. This
+means that a pull up or pull-down resistor is available on the output of the
+GPIO line, and this resistor is software controlled.
+
+In discrete designs, a pull-up or pull-down resistor is simply soldered on
+the circuit board. This is not something we deal with or model in software. The
+most you will think about these lines is that they will very likely be
+configured as open drain or open source (see the section above).
+
+The .set_config() callback can only turn pull up or down on and off, and will
+no have any semantic knowledge about the resistance used. It will only say
+switch a bit in a register enabling or disabling pull-up or pull-down.
+
+If the GPIO line supports shunting in different resistance values for the
+pull-up or pull-down resistor, the GPIO chip callback .set_config() will not
+suffice. For these complex use cases, a combined GPIO chip and pin controller
+need to be implemented, as the pin config interface of a pin controller
+supports more versatile control over electrical properties and can handle
+different pull-up or pull-down resistance values.
+
+
+GPIO drivers providing IRQs
+===========================
+
+It is custom that GPIO drivers (GPIO chips) are also providing interrupts,
+most often cascaded off a parent interrupt controller, and in some special
+cases the GPIO logic is melded with a SoC's primary interrupt controller.
+
+The IRQ portions of the GPIO block are implemented using an irq_chip, using
+the header <linux/irq.h>. So this combined driver is utilizing two sub-
+systems simultaneously: gpio and irq.
+
+It is legal for any IRQ consumer to request an IRQ from any irqchip even if it
+is a combined GPIO+IRQ driver. The basic premise is that gpio_chip and
+irq_chip are orthogonal, and offering their services independent of each
+other.
+
+gpiod_to_irq() is just a convenience function to figure out the IRQ for a
+certain GPIO line and should not be relied upon to have been called before
+the IRQ is used.
+
+Always prepare the hardware and make it ready for action in respective
+callbacks from the GPIO and irq_chip APIs. Do not rely on gpiod_to_irq() having
+been called first.
+
+We can divide GPIO irqchips in two broad categories:
+
+- CASCADED INTERRUPT CHIPS: this means that the GPIO chip has one common
+ interrupt output line, which is triggered by any enabled GPIO line on that
+ chip. The interrupt output line will then be routed to an parent interrupt
+ controller one level up, in the most simple case the systems primary
+ interrupt controller. This is modeled by an irqchip that will inspect bits
+ inside the GPIO controller to figure out which line fired it. The irqchip
+ part of the driver needs to inspect registers to figure this out and it
+ will likely also need to acknowledge that it is handling the interrupt
+ by clearing some bit (sometime implicitly, by just reading a status
+ register) and it will often need to set up the configuration such as
+ edge sensitivity (rising or falling edge, or high/low level interrupt for
+ example).
+
+- HIERARCHICAL INTERRUPT CHIPS: this means that each GPIO line has a dedicated
+ irq line to a parent interrupt controller one level up. There is no need
+ to inquire the GPIO hardware to figure out which line has fired, but it
+ may still be necessary to acknowledge the interrupt and set up configuration
+ such as edge sensitivity.
+
+Realtime considerations: a realtime compliant GPIO driver should not use
+spinlock_t or any sleepable APIs (like PM runtime) as part of its irqchip
+implementation.
+
+- spinlock_t should be replaced with raw_spinlock_t.[1]
+- If sleepable APIs have to be used, these can be done from the .irq_bus_lock()
+ and .irq_bus_unlock() callbacks, as these are the only slowpath callbacks
+ on an irqchip. Create the callbacks if needed.[2]
+
+
+Cascaded GPIO irqchips
+----------------------
+
+Cascaded GPIO irqchips usually fall in one of three categories:
+
+- CHAINED CASCADED GPIO IRQCHIPS: these are usually the type that is embedded on
+ an SoC. This means that there is a fast IRQ flow handler for the GPIOs that
+ gets called in a chain from the parent IRQ handler, most typically the
+ system interrupt controller. This means that the GPIO irqchip handler will
+ be called immediately from the parent irqchip, while holding the IRQs
+ disabled. The GPIO irqchip will then end up calling something like this
+ sequence in its interrupt handler::
+
+ static irqreturn_t foo_gpio_irq(int irq, void *data)
+ chained_irq_enter(...);
+ generic_handle_irq(...);
+ chained_irq_exit(...);
+
+ Chained GPIO irqchips typically can NOT set the .can_sleep flag on
+ struct gpio_chip, as everything happens directly in the callbacks: no
+ slow bus traffic like I2C can be used.
+
+ Realtime considerations: Note that chained IRQ handlers will not be forced
+ threaded on -RT. As a result, spinlock_t or any sleepable APIs (like PM
+ runtime) can't be used in a chained IRQ handler.
+
+ If required (and if it can't be converted to the nested threaded GPIO irqchip,
+ see below) a chained IRQ handler can be converted to generic irq handler and
+ this way it will become a threaded IRQ handler on -RT and a hard IRQ handler
+ on non-RT (for example, see [3]).
+
+ The generic_handle_irq() is expected to be called with IRQ disabled,
+ so the IRQ core will complain if it is called from an IRQ handler which is
+ forced to a thread. The "fake?" raw lock can be used to work around this
+ problem::
+
+ raw_spinlock_t wa_lock;
+ static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
+ unsigned long wa_lock_flags;
+ raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
+ generic_handle_irq(irq_find_mapping(bank->chip.irq.domain, bit));
+ raw_spin_unlock_irqrestore(&bank->wa_lock, wa_lock_flags);
+
+- GENERIC CHAINED GPIO IRQCHIPS: these are the same as "CHAINED GPIO irqchips",
+ but chained IRQ handlers are not used. Instead GPIO IRQs dispatching is
+ performed by generic IRQ handler which is configured using request_irq().
+ The GPIO irqchip will then end up calling something like this sequence in
+ its interrupt handler::
+
+ static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id)
+ for each detected GPIO IRQ
+ generic_handle_irq(...);
+
+ Realtime considerations: this kind of handlers will be forced threaded on -RT,
+ and as result the IRQ core will complain that generic_handle_irq() is called
+ with IRQ enabled and the same work-around as for "CHAINED GPIO irqchips" can
+ be applied.
+
+- NESTED THREADED GPIO IRQCHIPS: these are off-chip GPIO expanders and any
+ other GPIO irqchip residing on the other side of a sleeping bus such as I2C
+ or SPI.
+
+ Of course such drivers that need slow bus traffic to read out IRQ status and
+ similar, traffic which may in turn incur other IRQs to happen, cannot be
+ handled in a quick IRQ handler with IRQs disabled. Instead they need to spawn
+ a thread and then mask the parent IRQ line until the interrupt is handled
+ by the driver. The hallmark of this driver is to call something like
+ this in its interrupt handler::
+
+ static irqreturn_t foo_gpio_irq(int irq, void *data)
+ ...
+ handle_nested_irq(irq);
+
+ The hallmark of threaded GPIO irqchips is that they set the .can_sleep
+ flag on struct gpio_chip to true, indicating that this chip may sleep
+ when accessing the GPIOs.
+
+ These kinds of irqchips are inherently realtime tolerant as they are
+ already set up to handle sleeping contexts.
+
+
+Infrastructure helpers for GPIO irqchips
+----------------------------------------
+
+To help out in handling the set-up and management of GPIO irqchips and the
+associated irqdomain and resource allocation callbacks. These are activated
+by selecting the Kconfig symbol GPIOLIB_IRQCHIP. If the symbol
+IRQ_DOMAIN_HIERARCHY is also selected, hierarchical helpers will also be
+provided. A big portion of overhead code will be managed by gpiolib,
+under the assumption that your interrupts are 1-to-1-mapped to the
+GPIO line index:
+
+.. csv-table::
+ :header: GPIO line offset, Hardware IRQ
+
+ 0,0
+ 1,1
+ 2,2
+ ...,...
+ ngpio-1, ngpio-1
+
+
+If some GPIO lines do not have corresponding IRQs, the bitmask valid_mask
+and the flag need_valid_mask in gpio_irq_chip can be used to mask off some
+lines as invalid for associating with IRQs.
+
+The preferred way to set up the helpers is to fill in the
+struct gpio_irq_chip inside struct gpio_chip before adding the gpio_chip.
+If you do this, the additional irq_chip will be set up by gpiolib at the
+same time as setting up the rest of the GPIO functionality. The following
+is a typical example of a chained cascaded interrupt handler using
+the gpio_irq_chip. Note how the mask/unmask (or disable/enable) functions
+call into the core gpiolib code:
+
+.. code-block:: c
+
+ /* Typical state container */
+ struct my_gpio {
+ struct gpio_chip gc;
+ };
+
+ static void my_gpio_mask_irq(struct irq_data *d)
+ {
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+ /*
+ * Perform any necessary action to mask the interrupt,
+ * and then call into the core code to synchronise the
+ * state.
+ */
+
+ gpiochip_disable_irq(gc, hwirq);
+ }
+
+ static void my_gpio_unmask_irq(struct irq_data *d)
+ {
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+ gpiochip_enable_irq(gc, hwirq);
+
+ /*
+ * Perform any necessary action to unmask the interrupt,
+ * after having called into the core code to synchronise
+ * the state.
+ */
+ }
+
+ /*
+ * Statically populate the irqchip. Note that it is made const
+ * (further indicated by the IRQCHIP_IMMUTABLE flag), and that
+ * the GPIOCHIP_IRQ_RESOURCE_HELPER macro adds some extra
+ * callbacks to the structure.
+ */
+ static const struct irq_chip my_gpio_irq_chip = {
+ .name = "my_gpio_irq",
+ .irq_ack = my_gpio_ack_irq,
+ .irq_mask = my_gpio_mask_irq,
+ .irq_unmask = my_gpio_unmask_irq,
+ .irq_set_type = my_gpio_set_irq_type,
+ .flags = IRQCHIP_IMMUTABLE,
+ /* Provide the gpio resource callbacks */
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+ };
+
+ int irq; /* from platform etc */
+ struct my_gpio *g;
+ struct gpio_irq_chip *girq;
+
+ /* Get a pointer to the gpio_irq_chip */
+ girq = &g->gc.irq;
+ gpio_irq_chip_set_chip(girq, &my_gpio_irq_chip);
+ girq->parent_handler = ftgpio_gpio_irq_handler;
+ girq->num_parents = 1;
+ girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents),
+ GFP_KERNEL);
+ if (!girq->parents)
+ return -ENOMEM;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_bad_irq;
+ girq->parents[0] = irq;
+
+ return devm_gpiochip_add_data(dev, &g->gc, g);
+
+The helper supports using threaded interrupts as well. Then you just request
+the interrupt separately and go with it:
+
+.. code-block:: c
+
+ /* Typical state container */
+ struct my_gpio {
+ struct gpio_chip gc;
+ };
+
+ static void my_gpio_mask_irq(struct irq_data *d)
+ {
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+ /*
+ * Perform any necessary action to mask the interrupt,
+ * and then call into the core code to synchronise the
+ * state.
+ */
+
+ gpiochip_disable_irq(gc, hwirq);
+ }
+
+ static void my_gpio_unmask_irq(struct irq_data *d)
+ {
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+ gpiochip_enable_irq(gc, hwirq);
+
+ /*
+ * Perform any necessary action to unmask the interrupt,
+ * after having called into the core code to synchronise
+ * the state.
+ */
+ }
+
+ /*
+ * Statically populate the irqchip. Note that it is made const
+ * (further indicated by the IRQCHIP_IMMUTABLE flag), and that
+ * the GPIOCHIP_IRQ_RESOURCE_HELPER macro adds some extra
+ * callbacks to the structure.
+ */
+ static const struct irq_chip my_gpio_irq_chip = {
+ .name = "my_gpio_irq",
+ .irq_ack = my_gpio_ack_irq,
+ .irq_mask = my_gpio_mask_irq,
+ .irq_unmask = my_gpio_unmask_irq,
+ .irq_set_type = my_gpio_set_irq_type,
+ .flags = IRQCHIP_IMMUTABLE,
+ /* Provide the gpio resource callbacks */
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+ };
+
+ int irq; /* from platform etc */
+ struct my_gpio *g;
+ struct gpio_irq_chip *girq;
+
+ ret = devm_request_threaded_irq(dev, irq, NULL,
+ irq_thread_fn, IRQF_ONESHOT, "my-chip", g);
+ if (ret < 0)
+ return ret;
+
+ /* Get a pointer to the gpio_irq_chip */
+ girq = &g->gc.irq;
+ gpio_irq_chip_set_chip(girq, &my_gpio_irq_chip);
+ /* This will let us handle the parent IRQ in the driver */
+ girq->parent_handler = NULL;
+ girq->num_parents = 0;
+ girq->parents = NULL;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_bad_irq;
+
+ return devm_gpiochip_add_data(dev, &g->gc, g);
+
+The helper supports using hierarchical interrupt controllers as well.
+In this case the typical set-up will look like this:
+
+.. code-block:: c
+
+ /* Typical state container with dynamic irqchip */
+ struct my_gpio {
+ struct gpio_chip gc;
+ struct fwnode_handle *fwnode;
+ };
+
+ static void my_gpio_mask_irq(struct irq_data *d)
+ {
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+ /*
+ * Perform any necessary action to mask the interrupt,
+ * and then call into the core code to synchronise the
+ * state.
+ */
+
+ gpiochip_disable_irq(gc, hwirq);
+ irq_mask_mask_parent(d);
+ }
+
+ static void my_gpio_unmask_irq(struct irq_data *d)
+ {
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+ gpiochip_enable_irq(gc, hwirq);
+
+ /*
+ * Perform any necessary action to unmask the interrupt,
+ * after having called into the core code to synchronise
+ * the state.
+ */
+
+ irq_mask_unmask_parent(d);
+ }
+
+ /*
+ * Statically populate the irqchip. Note that it is made const
+ * (further indicated by the IRQCHIP_IMMUTABLE flag), and that
+ * the GPIOCHIP_IRQ_RESOURCE_HELPER macro adds some extra
+ * callbacks to the structure.
+ */
+ static const struct irq_chip my_gpio_irq_chip = {
+ .name = "my_gpio_irq",
+ .irq_ack = my_gpio_ack_irq,
+ .irq_mask = my_gpio_mask_irq,
+ .irq_unmask = my_gpio_unmask_irq,
+ .irq_set_type = my_gpio_set_irq_type,
+ .flags = IRQCHIP_IMMUTABLE,
+ /* Provide the gpio resource callbacks */
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+ };
+
+ struct my_gpio *g;
+ struct gpio_irq_chip *girq;
+
+ /* Get a pointer to the gpio_irq_chip */
+ girq = &g->gc.irq;
+ gpio_irq_chip_set_chip(girq, &my_gpio_irq_chip);
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_bad_irq;
+ girq->fwnode = g->fwnode;
+ girq->parent_domain = parent;
+ girq->child_to_parent_hwirq = my_gpio_child_to_parent_hwirq;
+
+ return devm_gpiochip_add_data(dev, &g->gc, g);
+
+As you can see pretty similar, but you do not supply a parent handler for
+the IRQ, instead a parent irqdomain, an fwnode for the hardware and
+a function .child_to_parent_hwirq() that has the purpose of looking up
+the parent hardware irq from a child (i.e. this gpio chip) hardware irq.
+As always it is good to look at examples in the kernel tree for advice
+on how to find the required pieces.
+
+If there is a need to exclude certain GPIO lines from the IRQ domain handled by
+these helpers, we can set .irq.need_valid_mask of the gpiochip before
+devm_gpiochip_add_data() or gpiochip_add_data() is called. This allocates an
+.irq.valid_mask with as many bits set as there are GPIO lines in the chip, each
+bit representing line 0..n-1. Drivers can exclude GPIO lines by clearing bits
+from this mask. The mask can be filled in the init_valid_mask() callback
+that is part of the struct gpio_irq_chip.
+
+To use the helpers please keep the following in mind:
+
+- Make sure to assign all relevant members of the struct gpio_chip so that
+ the irqchip can initialize. E.g. .dev and .can_sleep shall be set up
+ properly.
+
+- Nominally set gpio_irq_chip.handler to handle_bad_irq. Then, if your irqchip
+ is cascaded, set the handler to handle_level_irq() and/or handle_edge_irq()
+ in the irqchip .set_type() callback depending on what your controller
+ supports and what is requested by the consumer.
+
+
+Locking IRQ usage
+-----------------
+
+Since GPIO and irq_chip are orthogonal, we can get conflicts between different
+use cases. For example a GPIO line used for IRQs should be an input line,
+it does not make sense to fire interrupts on an output GPIO.
+
+If there is competition inside the subsystem which side is using the
+resource (a certain GPIO line and register for example) it needs to deny
+certain operations and keep track of usage inside of the gpiolib subsystem.
+
+Input GPIOs can be used as IRQ signals. When this happens, a driver is requested
+to mark the GPIO as being used as an IRQ::
+
+ int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
+
+This will prevent the use of non-irq related GPIO APIs until the GPIO IRQ lock
+is released::
+
+ void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
+
+When implementing an irqchip inside a GPIO driver, these two functions should
+typically be called in the .startup() and .shutdown() callbacks from the
+irqchip.
+
+When using the gpiolib irqchip helpers, these callbacks are automatically
+assigned.
+
+
+Disabling and enabling IRQs
+---------------------------
+
+In some (fringe) use cases, a driver may be using a GPIO line as input for IRQs,
+but occasionally switch that line over to drive output and then back to being
+an input with interrupts again. This happens on things like CEC (Consumer
+Electronics Control).
+
+When a GPIO is used as an IRQ signal, then gpiolib also needs to know if
+the IRQ is enabled or disabled. In order to inform gpiolib about this,
+the irqchip driver should call::
+
+ void gpiochip_disable_irq(struct gpio_chip *chip, unsigned int offset)
+
+This allows drivers to drive the GPIO as an output while the IRQ is
+disabled. When the IRQ is enabled again, a driver should call::
+
+ void gpiochip_enable_irq(struct gpio_chip *chip, unsigned int offset)
+
+When implementing an irqchip inside a GPIO driver, these two functions should
+typically be called in the .irq_disable() and .irq_enable() callbacks from the
+irqchip.
+
+When IRQCHIP_IMMUTABLE is not advertised by the irqchip, these callbacks
+are automatically assigned. This behaviour is deprecated and on its way
+to be removed from the kernel.
+
+
+Real-Time compliance for GPIO IRQ chips
+---------------------------------------
+
+Any provider of irqchips needs to be carefully tailored to support Real-Time
+preemption. It is desirable that all irqchips in the GPIO subsystem keep this
+in mind and do the proper testing to assure they are real time-enabled.
+
+So, pay attention on above realtime considerations in the documentation.
+
+The following is a checklist to follow when preparing a driver for real-time
+compliance:
+
+- ensure spinlock_t is not used as part irq_chip implementation
+- ensure that sleepable APIs are not used as part irq_chip implementation
+ If sleepable APIs have to be used, these can be done from the .irq_bus_lock()
+ and .irq_bus_unlock() callbacks
+- Chained GPIO irqchips: ensure spinlock_t or any sleepable APIs are not used
+ from the chained IRQ handler
+- Generic chained GPIO irqchips: take care about generic_handle_irq() calls and
+ apply corresponding work-around
+- Chained GPIO irqchips: get rid of the chained IRQ handler and use generic irq
+ handler if possible
+- regmap_mmio: it is possible to disable internal locking in regmap by setting
+ .disable_locking and handling the locking in the GPIO driver
+- Test your driver with the appropriate in-kernel real-time test cases for both
+ level and edge IRQs
+
+* [1] http://www.spinics.net/lists/linux-omap/msg120425.html
+* [2] https://lore.kernel.org/r/1443209283-20781-2-git-send-email-grygorii.strashko@ti.com
+* [3] https://lore.kernel.org/r/1443209283-20781-3-git-send-email-grygorii.strashko@ti.com
+
+
+Requesting self-owned GPIO pins
+===============================
+
+Sometimes it is useful to allow a GPIO chip driver to request its own GPIO
+descriptors through the gpiolib API. A GPIO driver can use the following
+functions to request and free descriptors::
+
+ struct gpio_desc *gpiochip_request_own_desc(struct gpio_desc *desc,
+ u16 hwnum,
+ const char *label,
+ enum gpiod_flags flags)
+
+ void gpiochip_free_own_desc(struct gpio_desc *desc)
+
+Descriptors requested with gpiochip_request_own_desc() must be released with
+gpiochip_free_own_desc().
+
+These functions must be used with care since they do not affect module use
+count. Do not use the functions to request gpio descriptors not owned by the
+calling driver.
diff --git a/Documentation/driver-api/gpio/drivers-on-gpio.rst b/Documentation/driver-api/gpio/drivers-on-gpio.rst
new file mode 100644
index 0000000000..af632d764a
--- /dev/null
+++ b/Documentation/driver-api/gpio/drivers-on-gpio.rst
@@ -0,0 +1,114 @@
+============================
+Subsystem drivers using GPIO
+============================
+
+Note that standard kernel drivers exist for common GPIO tasks and will provide
+the right in-kernel and userspace APIs/ABIs for the job, and that these
+drivers can quite easily interconnect with other kernel subsystems using
+hardware descriptions such as device tree or ACPI:
+
+- leds-gpio: drivers/leds/leds-gpio.c will handle LEDs connected to GPIO
+ lines, giving you the LED sysfs interface
+
+- ledtrig-gpio: drivers/leds/trigger/ledtrig-gpio.c will provide a LED trigger,
+ i.e. a LED will turn on/off in response to a GPIO line going high or low
+ (and that LED may in turn use the leds-gpio as per above).
+
+- gpio-keys: drivers/input/keyboard/gpio_keys.c is used when your GPIO line
+ can generate interrupts in response to a key press. Also supports debounce.
+
+- gpio-keys-polled: drivers/input/keyboard/gpio_keys_polled.c is used when your
+ GPIO line cannot generate interrupts, so it needs to be periodically polled
+ by a timer.
+
+- gpio_mouse: drivers/input/mouse/gpio_mouse.c is used to provide a mouse with
+ up to three buttons by simply using GPIOs and no mouse port. You can cut the
+ mouse cable and connect the wires to GPIO lines or solder a mouse connector
+ to the lines for a more permanent solution of this type.
+
+- gpio-beeper: drivers/input/misc/gpio-beeper.c is used to provide a beep from
+ an external speaker connected to a GPIO line.
+
+- extcon-gpio: drivers/extcon/extcon-gpio.c is used when you need to read an
+ external connector status, such as a headset line for an audio driver or an
+ HDMI connector. It will provide a better userspace sysfs interface than GPIO.
+
+- restart-gpio: drivers/power/reset/gpio-restart.c is used to restart/reboot
+ the system by pulling a GPIO line and will register a restart handler so
+ userspace can issue the right system call to restart the system.
+
+- poweroff-gpio: drivers/power/reset/gpio-poweroff.c is used to power the
+ system down by pulling a GPIO line and will register a pm_power_off()
+ callback so that userspace can issue the right system call to power down the
+ system.
+
+- gpio-gate-clock: drivers/clk/clk-gpio.c is used to control a gated clock
+ (off/on) that uses a GPIO, and integrated with the clock subsystem.
+
+- i2c-gpio: drivers/i2c/busses/i2c-gpio.c is used to drive an I2C bus
+ (two wires, SDA and SCL lines) by hammering (bitbang) two GPIO lines. It will
+ appear as any other I2C bus to the system and makes it possible to connect
+ drivers for the I2C devices on the bus like any other I2C bus driver.
+
+- spi_gpio: drivers/spi/spi-gpio.c is used to drive an SPI bus (variable number
+ of wires, at least SCK and optionally MISO, MOSI and chip select lines) using
+ GPIO hammering (bitbang). It will appear as any other SPI bus on the system
+ and makes it possible to connect drivers for SPI devices on the bus like
+ any other SPI bus driver. For example any MMC/SD card can then be connected
+ to this SPI by using the mmc_spi host from the MMC/SD card subsystem.
+
+- w1-gpio: drivers/w1/masters/w1-gpio.c is used to drive a one-wire bus using
+ a GPIO line, integrating with the W1 subsystem and handling devices on
+ the bus like any other W1 device.
+
+- gpio-fan: drivers/hwmon/gpio-fan.c is used to control a fan for cooling the
+ system, connected to a GPIO line (and optionally a GPIO alarm line),
+ presenting all the right in-kernel and sysfs interfaces to make your system
+ not overheat.
+
+- gpio-regulator: drivers/regulator/gpio-regulator.c is used to control a
+ regulator providing a certain voltage by pulling a GPIO line, integrating
+ with the regulator subsystem and giving you all the right interfaces.
+
+- gpio-wdt: drivers/watchdog/gpio_wdt.c is used to provide a watchdog timer
+ that will periodically "ping" a hardware connected to a GPIO line by toggling
+ it from 1-to-0-to-1. If that hardware does not receive its "ping"
+ periodically, it will reset the system.
+
+- gpio-nand: drivers/mtd/nand/raw/gpio.c is used to connect a NAND flash chip
+ to a set of simple GPIO lines: RDY, NCE, ALE, CLE, NWP. It interacts with the
+ NAND flash MTD subsystem and provides chip access and partition parsing like
+ any other NAND driving hardware.
+
+- ps2-gpio: drivers/input/serio/ps2-gpio.c is used to drive a PS/2 (IBM) serio
+ bus, data and clock line, by bit banging two GPIO lines. It will appear as
+ any other serio bus to the system and makes it possible to connect drivers
+ for e.g. keyboards and other PS/2 protocol based devices.
+
+- cec-gpio: drivers/media/platform/cec-gpio/ is used to interact with a CEC
+ Consumer Electronics Control bus using only GPIO. It is used to communicate
+ with devices on the HDMI bus.
+
+- gpio-charger: drivers/power/supply/gpio-charger.c is used if you need to do
+ battery charging and all you have to go by to check the presence of the
+ AC charger or more complex tasks such as indicating charging status using
+ nothing but GPIO lines, this driver provides that and also a clearly defined
+ way to pass the charging parameters from hardware descriptions such as the
+ device tree.
+
+- gpio-mux: drivers/mux/gpio.c is used for controlling a multiplexer using
+ n GPIO lines such that you can mux in 2^n different devices by activating
+ different GPIO lines. Often the GPIOs are on a SoC and the devices are
+ some SoC-external entities, such as different components on a PCB that
+ can be selectively enabled.
+
+Apart from this there are special GPIO drivers in subsystems like MMC/SD to
+read card detect and write protect GPIO lines, and in the TTY serial subsystem
+to emulate MCTRL (modem control) signals CTS/RTS by using two GPIO lines. The
+MTD NOR flash has add-ons for extra GPIO lines too, though the address bus is
+usually connected directly to the flash.
+
+Use those instead of talking directly to the GPIOs from userspace; they
+integrate with kernel frameworks better than your userspace code could.
+Needless to say, just using the appropriate kernel drivers will simplify and
+speed up your embedded hacking in particular by providing ready-made components.
diff --git a/Documentation/driver-api/gpio/index.rst b/Documentation/driver-api/gpio/index.rst
new file mode 100644
index 0000000000..1d48fe248f
--- /dev/null
+++ b/Documentation/driver-api/gpio/index.rst
@@ -0,0 +1,50 @@
+===================================
+General Purpose Input/Output (GPIO)
+===================================
+
+Contents:
+
+.. toctree::
+ :maxdepth: 2
+
+ intro
+ using-gpio
+ driver
+ consumer
+ board
+ drivers-on-gpio
+ legacy
+ bt8xxgpio
+
+Core
+====
+
+.. kernel-doc:: include/linux/gpio/driver.h
+ :internal:
+
+.. kernel-doc:: drivers/gpio/gpiolib.c
+ :export:
+
+ACPI support
+============
+
+.. kernel-doc:: drivers/gpio/gpiolib-acpi.c
+ :export:
+
+Device tree support
+===================
+
+.. kernel-doc:: drivers/gpio/gpiolib-of.c
+ :export:
+
+Device-managed API
+==================
+
+.. kernel-doc:: drivers/gpio/gpiolib-devres.c
+ :export:
+
+sysfs helpers
+=============
+
+.. kernel-doc:: drivers/gpio/gpiolib-sysfs.c
+ :export:
diff --git a/Documentation/driver-api/gpio/intro.rst b/Documentation/driver-api/gpio/intro.rst
new file mode 100644
index 0000000000..c9c19243b9
--- /dev/null
+++ b/Documentation/driver-api/gpio/intro.rst
@@ -0,0 +1,124 @@
+============
+Introduction
+============
+
+
+GPIO Interfaces
+===============
+
+The documents in this directory give detailed instructions on how to access
+GPIOs in drivers, and how to write a driver for a device that provides GPIOs
+itself.
+
+Due to the history of GPIO interfaces in the kernel, there are two different
+ways to obtain and use GPIOs:
+
+ - The descriptor-based interface is the preferred way to manipulate GPIOs,
+ and is described by all the files in this directory excepted legacy.rst.
+ - The legacy integer-based interface which is considered deprecated (but still
+ usable for compatibility reasons) is documented in legacy.rst.
+
+The remainder of this document applies to the new descriptor-based interface.
+legacy.rst contains the same information applied to the legacy
+integer-based interface.
+
+
+What is a GPIO?
+===============
+
+A "General Purpose Input/Output" (GPIO) is a flexible software-controlled
+digital signal. They are provided from many kinds of chips, and are familiar
+to Linux developers working with embedded and custom hardware. Each GPIO
+represents a bit connected to a particular pin, or "ball" on Ball Grid Array
+(BGA) packages. Board schematics show which external hardware connects to
+which GPIOs. Drivers can be written generically, so that board setup code
+passes such pin configuration data to drivers.
+
+System-on-Chip (SOC) processors heavily rely on GPIOs. In some cases, every
+non-dedicated pin can be configured as a GPIO; and most chips have at least
+several dozen of them. Programmable logic devices (like FPGAs) can easily
+provide GPIOs; multifunction chips like power managers, and audio codecs
+often have a few such pins to help with pin scarcity on SOCs; and there are
+also "GPIO Expander" chips that connect using the I2C or SPI serial buses.
+Most PC southbridges have a few dozen GPIO-capable pins (with only the BIOS
+firmware knowing how they're used).
+
+The exact capabilities of GPIOs vary between systems. Common options:
+
+ - Output values are writable (high=1, low=0). Some chips also have
+ options about how that value is driven, so that for example only one
+ value might be driven, supporting "wire-OR" and similar schemes for the
+ other value (notably, "open drain" signaling).
+
+ - Input values are likewise readable (1, 0). Some chips support readback
+ of pins configured as "output", which is very useful in such "wire-OR"
+ cases (to support bidirectional signaling). GPIO controllers may have
+ input de-glitch/debounce logic, sometimes with software controls.
+
+ - Inputs can often be used as IRQ signals, often edge triggered but
+ sometimes level triggered. Such IRQs may be configurable as system
+ wakeup events, to wake the system from a low power state.
+
+ - Usually a GPIO will be configurable as either input or output, as needed
+ by different product boards; single direction ones exist too.
+
+ - Most GPIOs can be accessed while holding spinlocks, but those accessed
+ through a serial bus normally can't. Some systems support both types.
+
+On a given board each GPIO is used for one specific purpose like monitoring
+MMC/SD card insertion/removal, detecting card write-protect status, driving
+a LED, configuring a transceiver, bit-banging a serial bus, poking a hardware
+watchdog, sensing a switch, and so on.
+
+
+Common GPIO Properties
+======================
+
+These properties are met through all the other documents of the GPIO interface
+and it is useful to understand them, especially if you need to define GPIO
+mappings.
+
+Active-High and Active-Low
+--------------------------
+It is natural to assume that a GPIO is "active" when its output signal is 1
+("high"), and inactive when it is 0 ("low"). However in practice the signal of a
+GPIO may be inverted before is reaches its destination, or a device could decide
+to have different conventions about what "active" means. Such decisions should
+be transparent to device drivers, therefore it is possible to define a GPIO as
+being either active-high ("1" means "active", the default) or active-low ("0"
+means "active") so that drivers only need to worry about the logical signal and
+not about what happens at the line level.
+
+Open Drain and Open Source
+--------------------------
+Sometimes shared signals need to use "open drain" (where only the low signal
+level is actually driven), or "open source" (where only the high signal level is
+driven) signaling. That term applies to CMOS transistors; "open collector" is
+used for TTL. A pullup or pulldown resistor causes the high or low signal level.
+This is sometimes called a "wire-AND"; or more practically, from the negative
+logic (low=true) perspective this is a "wire-OR".
+
+One common example of an open drain signal is a shared active-low IRQ line.
+Also, bidirectional data bus signals sometimes use open drain signals.
+
+Some GPIO controllers directly support open drain and open source outputs; many
+don't. When you need open drain signaling but your hardware doesn't directly
+support it, there's a common idiom you can use to emulate it with any GPIO pin
+that can be used as either an input or an output:
+
+ **LOW**: ``gpiod_direction_output(gpio, 0)`` ... this drives the signal and
+ overrides the pullup.
+
+ **HIGH**: ``gpiod_direction_input(gpio)`` ... this turns off the output, so
+ the pullup (or some other device) controls the signal.
+
+The same logic can be applied to emulate open source signaling, by driving the
+high signal and configuring the GPIO as input for low. This open drain/open
+source emulation can be handled transparently by the GPIO framework.
+
+If you are "driving" the signal high but gpiod_get_value(gpio) reports a low
+value (after the appropriate rise time passes), you know some other component is
+driving the shared signal low. That's not necessarily an error. As one common
+example, that's how I2C clocks are stretched: a slave that needs a slower clock
+delays the rising edge of SCK, and the I2C master adjusts its signaling rate
+accordingly.
diff --git a/Documentation/driver-api/gpio/legacy.rst b/Documentation/driver-api/gpio/legacy.rst
new file mode 100644
index 0000000000..b650591479
--- /dev/null
+++ b/Documentation/driver-api/gpio/legacy.rst
@@ -0,0 +1,695 @@
+======================
+Legacy GPIO Interfaces
+======================
+
+This provides an overview of GPIO access conventions on Linux.
+
+These calls use the gpio_* naming prefix. No other calls should use that
+prefix, or the related __gpio_* prefix.
+
+
+What is a GPIO?
+===============
+A "General Purpose Input/Output" (GPIO) is a flexible software-controlled
+digital signal. They are provided from many kinds of chip, and are familiar
+to Linux developers working with embedded and custom hardware. Each GPIO
+represents a bit connected to a particular pin, or "ball" on Ball Grid Array
+(BGA) packages. Board schematics show which external hardware connects to
+which GPIOs. Drivers can be written generically, so that board setup code
+passes such pin configuration data to drivers.
+
+System-on-Chip (SOC) processors heavily rely on GPIOs. In some cases, every
+non-dedicated pin can be configured as a GPIO; and most chips have at least
+several dozen of them. Programmable logic devices (like FPGAs) can easily
+provide GPIOs; multifunction chips like power managers, and audio codecs
+often have a few such pins to help with pin scarcity on SOCs; and there are
+also "GPIO Expander" chips that connect using the I2C or SPI serial busses.
+Most PC southbridges have a few dozen GPIO-capable pins (with only the BIOS
+firmware knowing how they're used).
+
+The exact capabilities of GPIOs vary between systems. Common options:
+
+ - Output values are writable (high=1, low=0). Some chips also have
+ options about how that value is driven, so that for example only one
+ value might be driven ... supporting "wire-OR" and similar schemes
+ for the other value (notably, "open drain" signaling).
+
+ - Input values are likewise readable (1, 0). Some chips support readback
+ of pins configured as "output", which is very useful in such "wire-OR"
+ cases (to support bidirectional signaling). GPIO controllers may have
+ input de-glitch/debounce logic, sometimes with software controls.
+
+ - Inputs can often be used as IRQ signals, often edge triggered but
+ sometimes level triggered. Such IRQs may be configurable as system
+ wakeup events, to wake the system from a low power state.
+
+ - Usually a GPIO will be configurable as either input or output, as needed
+ by different product boards; single direction ones exist too.
+
+ - Most GPIOs can be accessed while holding spinlocks, but those accessed
+ through a serial bus normally can't. Some systems support both types.
+
+On a given board each GPIO is used for one specific purpose like monitoring
+MMC/SD card insertion/removal, detecting card writeprotect status, driving
+a LED, configuring a transceiver, bitbanging a serial bus, poking a hardware
+watchdog, sensing a switch, and so on.
+
+
+GPIO conventions
+================
+Note that this is called a "convention" because you don't need to do it this
+way, and it's no crime if you don't. There **are** cases where portability
+is not the main issue; GPIOs are often used for the kind of board-specific
+glue logic that may even change between board revisions, and can't ever be
+used on a board that's wired differently. Only least-common-denominator
+functionality can be very portable. Other features are platform-specific,
+and that can be critical for glue logic.
+
+Plus, this doesn't require any implementation framework, just an interface.
+One platform might implement it as simple inline functions accessing chip
+registers; another might implement it by delegating through abstractions
+used for several very different kinds of GPIO controller. (There is some
+optional code supporting such an implementation strategy, described later
+in this document, but drivers acting as clients to the GPIO interface must
+not care how it's implemented.)
+
+That said, if the convention is supported on their platform, drivers should
+use it when possible. Platforms must select GPIOLIB if GPIO functionality
+is strictly required. Drivers that can't work without
+standard GPIO calls should have Kconfig entries which depend on GPIOLIB. The
+GPIO calls are available, either as "real code" or as optimized-away stubs,
+when drivers use the include file:
+
+ #include <linux/gpio.h>
+
+If you stick to this convention then it'll be easier for other developers to
+see what your code is doing, and help maintain it.
+
+Note that these operations include I/O barriers on platforms which need to
+use them; drivers don't need to add them explicitly.
+
+
+Identifying GPIOs
+-----------------
+GPIOs are identified by unsigned integers in the range 0..MAX_INT. That
+reserves "negative" numbers for other purposes like marking signals as
+"not available on this board", or indicating faults. Code that doesn't
+touch the underlying hardware treats these integers as opaque cookies.
+
+Platforms define how they use those integers, and usually #define symbols
+for the GPIO lines so that board-specific setup code directly corresponds
+to the relevant schematics. In contrast, drivers should only use GPIO
+numbers passed to them from that setup code, using platform_data to hold
+board-specific pin configuration data (along with other board specific
+data they need). That avoids portability problems.
+
+So for example one platform uses numbers 32-159 for GPIOs; while another
+uses numbers 0..63 with one set of GPIO controllers, 64-79 with another
+type of GPIO controller, and on one particular board 80-95 with an FPGA.
+The numbers need not be contiguous; either of those platforms could also
+use numbers 2000-2063 to identify GPIOs in a bank of I2C GPIO expanders.
+
+If you want to initialize a structure with an invalid GPIO number, use
+some negative number (perhaps "-EINVAL"); that will never be valid. To
+test if such number from such a structure could reference a GPIO, you
+may use this predicate:
+
+ int gpio_is_valid(int number);
+
+A number that's not valid will be rejected by calls which may request
+or free GPIOs (see below). Other numbers may also be rejected; for
+example, a number might be valid but temporarily unused on a given board.
+
+Whether a platform supports multiple GPIO controllers is a platform-specific
+implementation issue, as are whether that support can leave "holes" in the space
+of GPIO numbers, and whether new controllers can be added at runtime. Such issues
+can affect things including whether adjacent GPIO numbers are both valid.
+
+Using GPIOs
+-----------
+The first thing a system should do with a GPIO is allocate it, using
+the gpio_request() call; see later.
+
+One of the next things to do with a GPIO, often in board setup code when
+setting up a platform_device using the GPIO, is mark its direction::
+
+ /* set as input or output, returning 0 or negative errno */
+ int gpio_direction_input(unsigned gpio);
+ int gpio_direction_output(unsigned gpio, int value);
+
+The return value is zero for success, else a negative errno. It should
+be checked, since the get/set calls don't have error returns and since
+misconfiguration is possible. You should normally issue these calls from
+a task context. However, for spinlock-safe GPIOs it's OK to use them
+before tasking is enabled, as part of early board setup.
+
+For output GPIOs, the value provided becomes the initial output value.
+This helps avoid signal glitching during system startup.
+
+For compatibility with legacy interfaces to GPIOs, setting the direction
+of a GPIO implicitly requests that GPIO (see below) if it has not been
+requested already. That compatibility is being removed from the optional
+gpiolib framework.
+
+Setting the direction can fail if the GPIO number is invalid, or when
+that particular GPIO can't be used in that mode. It's generally a bad
+idea to rely on boot firmware to have set the direction correctly, since
+it probably wasn't validated to do more than boot Linux. (Similarly,
+that board setup code probably needs to multiplex that pin as a GPIO,
+and configure pullups/pulldowns appropriately.)
+
+
+Spinlock-Safe GPIO access
+-------------------------
+Most GPIO controllers can be accessed with memory read/write instructions.
+Those don't need to sleep, and can safely be done from inside hard
+(nonthreaded) IRQ handlers and similar contexts.
+
+Use the following calls to access such GPIOs::
+
+ /* GPIO INPUT: return zero or nonzero */
+ int gpio_get_value(unsigned gpio);
+
+ /* GPIO OUTPUT */
+ void gpio_set_value(unsigned gpio, int value);
+
+The values are boolean, zero for low, nonzero for high. When reading the
+value of an output pin, the value returned should be what's seen on the
+pin ... that won't always match the specified output value, because of
+issues including open-drain signaling and output latencies.
+
+The get/set calls have no error returns because "invalid GPIO" should have
+been reported earlier from gpio_direction_*(). However, note that not all
+platforms can read the value of output pins; those that can't should always
+return zero. Also, using these calls for GPIOs that can't safely be accessed
+without sleeping (see below) is an error.
+
+Platform-specific implementations are encouraged to optimize the two
+calls to access the GPIO value in cases where the GPIO number (and for
+output, value) are constant. It's normal for them to need only a couple
+of instructions in such cases (reading or writing a hardware register),
+and not to need spinlocks. Such optimized calls can make bitbanging
+applications a lot more efficient (in both space and time) than spending
+dozens of instructions on subroutine calls.
+
+
+GPIO access that may sleep
+--------------------------
+Some GPIO controllers must be accessed using message based busses like I2C
+or SPI. Commands to read or write those GPIO values require waiting to
+get to the head of a queue to transmit a command and get its response.
+This requires sleeping, which can't be done from inside IRQ handlers.
+To access such GPIOs, a different set of accessors is defined::
+
+ /* GPIO INPUT: return zero or nonzero, might sleep */
+ int gpio_get_value_cansleep(unsigned gpio);
+
+ /* GPIO OUTPUT, might sleep */
+ void gpio_set_value_cansleep(unsigned gpio, int value);
+
+Accessing such GPIOs requires a context which may sleep, for example
+a threaded IRQ handler, and those accessors must be used instead of
+spinlock-safe accessors without the cansleep() name suffix.
+
+Other than the fact that these accessors might sleep, and will work
+on GPIOs that can't be accessed from hardIRQ handlers, these calls act
+the same as the spinlock-safe calls.
+
+**IN ADDITION** calls to setup and configure such GPIOs must be made
+from contexts which may sleep, since they may need to access the GPIO
+controller chip too (These setup calls are usually made from board
+setup or driver probe/teardown code, so this is an easy constraint.)::
+
+ gpio_direction_input()
+ gpio_direction_output()
+ gpio_request()
+
+ ## gpio_request_one()
+ ## gpio_request_array()
+ ## gpio_free_array()
+
+ gpio_free()
+
+
+Claiming and Releasing GPIOs
+----------------------------
+To help catch system configuration errors, two calls are defined::
+
+ /* request GPIO, returning 0 or negative errno.
+ * non-null labels may be useful for diagnostics.
+ */
+ int gpio_request(unsigned gpio, const char *label);
+
+ /* release previously-claimed GPIO */
+ void gpio_free(unsigned gpio);
+
+Passing invalid GPIO numbers to gpio_request() will fail, as will requesting
+GPIOs that have already been claimed with that call. The return value of
+gpio_request() must be checked. You should normally issue these calls from
+a task context. However, for spinlock-safe GPIOs it's OK to request GPIOs
+before tasking is enabled, as part of early board setup.
+
+These calls serve two basic purposes. One is marking the signals which
+are actually in use as GPIOs, for better diagnostics; systems may have
+several hundred potential GPIOs, but often only a dozen are used on any
+given board. Another is to catch conflicts, identifying errors when
+(a) two or more drivers wrongly think they have exclusive use of that
+signal, or (b) something wrongly believes it's safe to remove drivers
+needed to manage a signal that's in active use. That is, requesting a
+GPIO can serve as a kind of lock.
+
+Some platforms may also use knowledge about what GPIOs are active for
+power management, such as by powering down unused chip sectors and, more
+easily, gating off unused clocks.
+
+For GPIOs that use pins known to the pinctrl subsystem, that subsystem should
+be informed of their use; a gpiolib driver's .request() operation may call
+pinctrl_gpio_request(), and a gpiolib driver's .free() operation may call
+pinctrl_gpio_free(). The pinctrl subsystem allows a pinctrl_gpio_request()
+to succeed concurrently with a pin or pingroup being "owned" by a device for
+pin multiplexing.
+
+Any programming of pin multiplexing hardware that is needed to route the
+GPIO signal to the appropriate pin should occur within a GPIO driver's
+.direction_input() or .direction_output() operations, and occur after any
+setup of an output GPIO's value. This allows a glitch-free migration from a
+pin's special function to GPIO. This is sometimes required when using a GPIO
+to implement a workaround on signals typically driven by a non-GPIO HW block.
+
+Some platforms allow some or all GPIO signals to be routed to different pins.
+Similarly, other aspects of the GPIO or pin may need to be configured, such as
+pullup/pulldown. Platform software should arrange that any such details are
+configured prior to gpio_request() being called for those GPIOs, e.g. using
+the pinctrl subsystem's mapping table, so that GPIO users need not be aware
+of these details.
+
+Also note that it's your responsibility to have stopped using a GPIO
+before you free it.
+
+Considering in most cases GPIOs are actually configured right after they
+are claimed, three additional calls are defined::
+
+ /* request a single GPIO, with initial configuration specified by
+ * 'flags', identical to gpio_request() wrt other arguments and
+ * return value
+ */
+ int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
+
+ /* request multiple GPIOs in a single call
+ */
+ int gpio_request_array(struct gpio *array, size_t num);
+
+ /* release multiple GPIOs in a single call
+ */
+ void gpio_free_array(struct gpio *array, size_t num);
+
+where 'flags' is currently defined to specify the following properties:
+
+ * GPIOF_DIR_IN - to configure direction as input
+ * GPIOF_DIR_OUT - to configure direction as output
+
+ * GPIOF_INIT_LOW - as output, set initial level to LOW
+ * GPIOF_INIT_HIGH - as output, set initial level to HIGH
+
+since GPIOF_INIT_* are only valid when configured as output, so group valid
+combinations as:
+
+ * GPIOF_IN - configure as input
+ * GPIOF_OUT_INIT_LOW - configured as output, initial level LOW
+ * GPIOF_OUT_INIT_HIGH - configured as output, initial level HIGH
+
+Further more, to ease the claim/release of multiple GPIOs, 'struct gpio' is
+introduced to encapsulate all three fields as::
+
+ struct gpio {
+ unsigned gpio;
+ unsigned long flags;
+ const char *label;
+ };
+
+A typical example of usage::
+
+ static struct gpio leds_gpios[] = {
+ { 32, GPIOF_OUT_INIT_HIGH, "Power LED" }, /* default to ON */
+ { 33, GPIOF_OUT_INIT_LOW, "Green LED" }, /* default to OFF */
+ { 34, GPIOF_OUT_INIT_LOW, "Red LED" }, /* default to OFF */
+ { 35, GPIOF_OUT_INIT_LOW, "Blue LED" }, /* default to OFF */
+ { ... },
+ };
+
+ err = gpio_request_one(31, GPIOF_IN, "Reset Button");
+ if (err)
+ ...
+
+ err = gpio_request_array(leds_gpios, ARRAY_SIZE(leds_gpios));
+ if (err)
+ ...
+
+ gpio_free_array(leds_gpios, ARRAY_SIZE(leds_gpios));
+
+
+GPIOs mapped to IRQs
+--------------------
+GPIO numbers are unsigned integers; so are IRQ numbers. These make up
+two logically distinct namespaces (GPIO 0 need not use IRQ 0). You can
+map between them using calls like::
+
+ /* map GPIO numbers to IRQ numbers */
+ int gpio_to_irq(unsigned gpio);
+
+Those return either the corresponding number in the other namespace, or
+else a negative errno code if the mapping can't be done. (For example,
+some GPIOs can't be used as IRQs.) It is an unchecked error to use a GPIO
+number that wasn't set up as an input using gpio_direction_input(), or
+to use an IRQ number that didn't originally come from gpio_to_irq().
+
+These two mapping calls are expected to cost on the order of a single
+addition or subtraction. They're not allowed to sleep.
+
+Non-error values returned from gpio_to_irq() can be passed to request_irq()
+or free_irq(). They will often be stored into IRQ resources for platform
+devices, by the board-specific initialization code. Note that IRQ trigger
+options are part of the IRQ interface, e.g. IRQF_TRIGGER_FALLING, as are
+system wakeup capabilities.
+
+
+Emulating Open Drain Signals
+----------------------------
+Sometimes shared signals need to use "open drain" signaling, where only the
+low signal level is actually driven. (That term applies to CMOS transistors;
+"open collector" is used for TTL.) A pullup resistor causes the high signal
+level. This is sometimes called a "wire-AND"; or more practically, from the
+negative logic (low=true) perspective this is a "wire-OR".
+
+One common example of an open drain signal is a shared active-low IRQ line.
+Also, bidirectional data bus signals sometimes use open drain signals.
+
+Some GPIO controllers directly support open drain outputs; many don't. When
+you need open drain signaling but your hardware doesn't directly support it,
+there's a common idiom you can use to emulate it with any GPIO pin that can
+be used as either an input or an output:
+
+ LOW: gpio_direction_output(gpio, 0) ... this drives the signal
+ and overrides the pullup.
+
+ HIGH: gpio_direction_input(gpio) ... this turns off the output,
+ so the pullup (or some other device) controls the signal.
+
+If you are "driving" the signal high but gpio_get_value(gpio) reports a low
+value (after the appropriate rise time passes), you know some other component
+is driving the shared signal low. That's not necessarily an error. As one
+common example, that's how I2C clocks are stretched: a slave that needs a
+slower clock delays the rising edge of SCK, and the I2C master adjusts its
+signaling rate accordingly.
+
+
+GPIO controllers and the pinctrl subsystem
+------------------------------------------
+
+A GPIO controller on a SOC might be tightly coupled with the pinctrl
+subsystem, in the sense that the pins can be used by other functions
+together with an optional gpio feature. We have already covered the
+case where e.g. a GPIO controller need to reserve a pin or set the
+direction of a pin by calling any of::
+
+ pinctrl_gpio_request()
+ pinctrl_gpio_free()
+ pinctrl_gpio_direction_input()
+ pinctrl_gpio_direction_output()
+
+But how does the pin control subsystem cross-correlate the GPIO
+numbers (which are a global business) to a certain pin on a certain
+pin controller?
+
+This is done by registering "ranges" of pins, which are essentially
+cross-reference tables. These are described in
+Documentation/driver-api/pin-control.rst
+
+While the pin allocation is totally managed by the pinctrl subsystem,
+gpio (under gpiolib) is still maintained by gpio drivers. It may happen
+that different pin ranges in a SoC is managed by different gpio drivers.
+
+This makes it logical to let gpio drivers announce their pin ranges to
+the pin ctrl subsystem before it will call 'pinctrl_gpio_request' in order
+to request the corresponding pin to be prepared by the pinctrl subsystem
+before any gpio usage.
+
+For this, the gpio controller can register its pin range with pinctrl
+subsystem. There are two ways of doing it currently: with or without DT.
+
+For with DT support refer to Documentation/devicetree/bindings/gpio/gpio.txt.
+
+For non-DT support, user can call gpiochip_add_pin_range() with appropriate
+parameters to register a range of gpio pins with a pinctrl driver. For this
+exact name string of pinctrl device has to be passed as one of the
+argument to this routine.
+
+
+What do these conventions omit?
+===============================
+One of the biggest things these conventions omit is pin multiplexing, since
+this is highly chip-specific and nonportable. One platform might not need
+explicit multiplexing; another might have just two options for use of any
+given pin; another might have eight options per pin; another might be able
+to route a given GPIO to any one of several pins. (Yes, those examples all
+come from systems that run Linux today.)
+
+Related to multiplexing is configuration and enabling of the pullups or
+pulldowns integrated on some platforms. Not all platforms support them,
+or support them in the same way; and any given board might use external
+pullups (or pulldowns) so that the on-chip ones should not be used.
+(When a circuit needs 5 kOhm, on-chip 100 kOhm resistors won't do.)
+Likewise drive strength (2 mA vs 20 mA) and voltage (1.8V vs 3.3V) is a
+platform-specific issue, as are models like (not) having a one-to-one
+correspondence between configurable pins and GPIOs.
+
+There are other system-specific mechanisms that are not specified here,
+like the aforementioned options for input de-glitching and wire-OR output.
+Hardware may support reading or writing GPIOs in gangs, but that's usually
+configuration dependent: for GPIOs sharing the same bank. (GPIOs are
+commonly grouped in banks of 16 or 32, with a given SOC having several such
+banks.) Some systems can trigger IRQs from output GPIOs, or read values
+from pins not managed as GPIOs. Code relying on such mechanisms will
+necessarily be nonportable.
+
+Dynamic definition of GPIOs is not currently standard; for example, as
+a side effect of configuring an add-on board with some GPIO expanders.
+
+
+GPIO implementor's framework (OPTIONAL)
+=======================================
+As noted earlier, there is an optional implementation framework making it
+easier for platforms to support different kinds of GPIO controller using
+the same programming interface. This framework is called "gpiolib".
+
+As a debugging aid, if debugfs is available a /sys/kernel/debug/gpio file
+will be found there. That will list all the controllers registered through
+this framework, and the state of the GPIOs currently in use.
+
+
+Controller Drivers: gpio_chip
+-----------------------------
+In this framework each GPIO controller is packaged as a "struct gpio_chip"
+with information common to each controller of that type:
+
+ - methods to establish GPIO direction
+ - methods used to access GPIO values
+ - flag saying whether calls to its methods may sleep
+ - optional debugfs dump method (showing extra state like pullup config)
+ - label for diagnostics
+
+There is also per-instance data, which may come from device.platform_data:
+the number of its first GPIO, and how many GPIOs it exposes.
+
+The code implementing a gpio_chip should support multiple instances of the
+controller, possibly using the driver model. That code will configure each
+gpio_chip and issue gpiochip_add(). Removing a GPIO controller should be
+rare; use gpiochip_remove() when it is unavoidable.
+
+Most often a gpio_chip is part of an instance-specific structure with state
+not exposed by the GPIO interfaces, such as addressing, power management,
+and more. Chips such as codecs will have complex non-GPIO state.
+
+Any debugfs dump method should normally ignore signals which haven't been
+requested as GPIOs. They can use gpiochip_is_requested(), which returns
+either NULL or the label associated with that GPIO when it was requested.
+
+
+Platform Support
+----------------
+To force-enable this framework, a platform's Kconfig will "select" GPIOLIB,
+else it is up to the user to configure support for GPIO.
+
+If neither of these options are selected, the platform does not support
+GPIOs through GPIO-lib and the code cannot be enabled by the user.
+
+Trivial implementations of those functions can directly use framework
+code, which always dispatches through the gpio_chip::
+
+ #define gpio_get_value __gpio_get_value
+ #define gpio_set_value __gpio_set_value
+
+Fancier implementations could instead define those as inline functions with
+logic optimizing access to specific SOC-based GPIOs. For example, if the
+referenced GPIO is the constant "12", getting or setting its value could
+cost as little as two or three instructions, never sleeping. When such an
+optimization is not possible those calls must delegate to the framework
+code, costing at least a few dozen instructions. For bitbanged I/O, such
+instruction savings can be significant.
+
+For SOCs, platform-specific code defines and registers gpio_chip instances
+for each bank of on-chip GPIOs. Those GPIOs should be numbered/labeled to
+match chip vendor documentation, and directly match board schematics. They
+may well start at zero and go up to a platform-specific limit. Such GPIOs
+are normally integrated into platform initialization to make them always be
+available, from arch_initcall() or earlier; they can often serve as IRQs.
+
+
+Board Support
+-------------
+For external GPIO controllers -- such as I2C or SPI expanders, ASICs, multi
+function devices, FPGAs or CPLDs -- most often board-specific code handles
+registering controller devices and ensures that their drivers know what GPIO
+numbers to use with gpiochip_add(). Their numbers often start right after
+platform-specific GPIOs.
+
+For example, board setup code could create structures identifying the range
+of GPIOs that chip will expose, and passes them to each GPIO expander chip
+using platform_data. Then the chip driver's probe() routine could pass that
+data to gpiochip_add().
+
+Initialization order can be important. For example, when a device relies on
+an I2C-based GPIO, its probe() routine should only be called after that GPIO
+becomes available. That may mean the device should not be registered until
+calls for that GPIO can work. One way to address such dependencies is for
+such gpio_chip controllers to provide setup() and teardown() callbacks to
+board specific code; those board specific callbacks would register devices
+once all the necessary resources are available, and remove them later when
+the GPIO controller device becomes unavailable.
+
+
+Sysfs Interface for Userspace (OPTIONAL)
+========================================
+Platforms which use the "gpiolib" implementors framework may choose to
+configure a sysfs user interface to GPIOs. This is different from the
+debugfs interface, since it provides control over GPIO direction and
+value instead of just showing a gpio state summary. Plus, it could be
+present on production systems without debugging support.
+
+Given appropriate hardware documentation for the system, userspace could
+know for example that GPIO #23 controls the write protect line used to
+protect boot loader segments in flash memory. System upgrade procedures
+may need to temporarily remove that protection, first importing a GPIO,
+then changing its output state, then updating the code before re-enabling
+the write protection. In normal use, GPIO #23 would never be touched,
+and the kernel would have no need to know about it.
+
+Again depending on appropriate hardware documentation, on some systems
+userspace GPIO can be used to determine system configuration data that
+standard kernels won't know about. And for some tasks, simple userspace
+GPIO drivers could be all that the system really needs.
+
+Note that standard kernel drivers exist for common "LEDs and Buttons"
+GPIO tasks: "leds-gpio" and "gpio_keys", respectively. Use those
+instead of talking directly to the GPIOs; they integrate with kernel
+frameworks better than your userspace code could.
+
+
+Paths in Sysfs
+--------------
+There are three kinds of entry in /sys/class/gpio:
+
+ - Control interfaces used to get userspace control over GPIOs;
+
+ - GPIOs themselves; and
+
+ - GPIO controllers ("gpio_chip" instances).
+
+That's in addition to standard files including the "device" symlink.
+
+The control interfaces are write-only:
+
+ /sys/class/gpio/
+
+ "export" ... Userspace may ask the kernel to export control of
+ a GPIO to userspace by writing its number to this file.
+
+ Example: "echo 19 > export" will create a "gpio19" node
+ for GPIO #19, if that's not requested by kernel code.
+
+ "unexport" ... Reverses the effect of exporting to userspace.
+
+ Example: "echo 19 > unexport" will remove a "gpio19"
+ node exported using the "export" file.
+
+GPIO signals have paths like /sys/class/gpio/gpio42/ (for GPIO #42)
+and have the following read/write attributes:
+
+ /sys/class/gpio/gpioN/
+
+ "direction" ... reads as either "in" or "out". This value may
+ normally be written. Writing as "out" defaults to
+ initializing the value as low. To ensure glitch free
+ operation, values "low" and "high" may be written to
+ configure the GPIO as an output with that initial value.
+
+ Note that this attribute *will not exist* if the kernel
+ doesn't support changing the direction of a GPIO, or
+ it was exported by kernel code that didn't explicitly
+ allow userspace to reconfigure this GPIO's direction.
+
+ "value" ... reads as either 0 (low) or 1 (high). If the GPIO
+ is configured as an output, this value may be written;
+ any nonzero value is treated as high.
+
+ If the pin can be configured as interrupt-generating interrupt
+ and if it has been configured to generate interrupts (see the
+ description of "edge"), you can poll(2) on that file and
+ poll(2) will return whenever the interrupt was triggered. If
+ you use poll(2), set the events POLLPRI. If you use select(2),
+ set the file descriptor in exceptfds. After poll(2) returns,
+ either lseek(2) to the beginning of the sysfs file and read the
+ new value or close the file and re-open it to read the value.
+
+ "edge" ... reads as either "none", "rising", "falling", or
+ "both". Write these strings to select the signal edge(s)
+ that will make poll(2) on the "value" file return.
+
+ This file exists only if the pin can be configured as an
+ interrupt generating input pin.
+
+ "active_low" ... reads as either 0 (false) or 1 (true). Write
+ any nonzero value to invert the value attribute both
+ for reading and writing. Existing and subsequent
+ poll(2) support configuration via the edge attribute
+ for "rising" and "falling" edges will follow this
+ setting.
+
+GPIO controllers have paths like /sys/class/gpio/gpiochip42/ (for the
+controller implementing GPIOs starting at #42) and have the following
+read-only attributes:
+
+ /sys/class/gpio/gpiochipN/
+
+ "base" ... same as N, the first GPIO managed by this chip
+
+ "label" ... provided for diagnostics (not always unique)
+
+ "ngpio" ... how many GPIOs this manges (N to N + ngpio - 1)
+
+Board documentation should in most cases cover what GPIOs are used for
+what purposes. However, those numbers are not always stable; GPIOs on
+a daughtercard might be different depending on the base board being used,
+or other cards in the stack. In such cases, you may need to use the
+gpiochip nodes (possibly in conjunction with schematics) to determine
+the correct GPIO number to use for a given signal.
+
+
+API Reference
+=============
+
+The functions listed in this section are deprecated. The GPIO descriptor based
+API should be used in new code.
+
+.. kernel-doc:: drivers/gpio/gpiolib-legacy.c
+ :export:
diff --git a/Documentation/driver-api/gpio/using-gpio.rst b/Documentation/driver-api/gpio/using-gpio.rst
new file mode 100644
index 0000000000..894d88855d
--- /dev/null
+++ b/Documentation/driver-api/gpio/using-gpio.rst
@@ -0,0 +1,50 @@
+=========================
+Using GPIO Lines in Linux
+=========================
+
+The Linux kernel exists to abstract and present hardware to users. GPIO lines
+as such are normally not user facing abstractions. The most obvious, natural
+and preferred way to use GPIO lines is to let kernel hardware drivers deal
+with them.
+
+For examples of already existing generic drivers that will also be good
+examples for any other kernel drivers you want to author, refer to
+Documentation/driver-api/gpio/drivers-on-gpio.rst
+
+For any kind of mass produced system you want to support, such as servers,
+laptops, phones, tablets, routers, and any consumer or office or business goods
+using appropriate kernel drivers is paramount. Submit your code for inclusion
+in the upstream Linux kernel when you feel it is mature enough and you will get
+help to refine it, see Documentation/process/submitting-patches.rst.
+
+In Linux GPIO lines also have a userspace ABI.
+
+The userspace ABI is intended for one-off deployments. Examples are prototypes,
+factory lines, maker community projects, workshop specimen, production tools,
+industrial automation, PLC-type use cases, door controllers, in short a piece
+of specialized equipment that is not produced by the numbers, requiring
+operators to have a deep knowledge of the equipment and knows about the
+software-hardware interface to be set up. They should not have a natural fit
+to any existing kernel subsystem and not be a good fit for an operating system,
+because of not being reusable or abstract enough, or involving a lot of non
+computer hardware related policy.
+
+Applications that have a good reason to use the industrial I/O (IIO) subsystem
+from userspace will likely be a good fit for using GPIO lines from userspace as
+well.
+
+Do not under any circumstances abuse the GPIO userspace ABI to cut corners in
+any product development projects. If you use it for prototyping, then do not
+productify the prototype: rewrite it using proper kernel drivers. Do not under
+any circumstances deploy any uniform products using GPIO from userspace.
+
+The userspace ABI is a character device for each GPIO hardware unit (GPIO chip).
+These devices will appear on the system as ``/dev/gpiochip0`` thru
+``/dev/gpiochipN``. Examples of how to directly use the userspace ABI can be
+found in the kernel tree ``tools/gpio`` subdirectory.
+
+For structured and managed applications, we recommend that you make use of the
+libgpiod_ library. This provides helper abstractions, command line utilities
+and arbitration for multiple simultaneous consumers on the same GPIO chip.
+
+.. _libgpiod: https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/
diff --git a/Documentation/driver-api/hsi.rst b/Documentation/driver-api/hsi.rst
new file mode 100644
index 0000000000..01b6bebfbd
--- /dev/null
+++ b/Documentation/driver-api/hsi.rst
@@ -0,0 +1,88 @@
+High Speed Synchronous Serial Interface (HSI)
+=============================================
+
+Introduction
+---------------
+
+High Speed Synchronous Interface (HSI) is a full duplex, low latency protocol,
+that is optimized for die-level interconnect between an Application Processor
+and a Baseband chipset. It has been specified by the MIPI alliance in 2003 and
+implemented by multiple vendors since then.
+
+The HSI interface supports full duplex communication over multiple channels
+(typically 8) and is capable of reaching speeds up to 200 Mbit/s.
+
+The serial protocol uses two signals, DATA and FLAG as combined data and clock
+signals and an additional READY signal for flow control. An additional WAKE
+signal can be used to wakeup the chips from standby modes. The signals are
+commonly prefixed by AC for signals going from the application die to the
+cellular die and CA for signals going the other way around.
+
+::
+
+ +------------+ +---------------+
+ | Cellular | | Application |
+ | Die | | Die |
+ | | - - - - - - CAWAKE - - - - - - >| |
+ | T|------------ CADATA ------------>|R |
+ | X|------------ CAFLAG ------------>|X |
+ | |<----------- ACREADY ------------| |
+ | | | |
+ | | | |
+ | |< - - - - - ACWAKE - - - - - - -| |
+ | R|<----------- ACDATA -------------|T |
+ | X|<----------- ACFLAG -------------|X |
+ | |------------ CAREADY ----------->| |
+ | | | |
+ | | | |
+ +------------+ +---------------+
+
+HSI Subsystem in Linux
+-------------------------
+
+In the Linux kernel the hsi subsystem is supposed to be used for HSI devices.
+The hsi subsystem contains drivers for hsi controllers including support for
+multi-port controllers and provides a generic API for using the HSI ports.
+
+It also contains HSI client drivers, which make use of the generic API to
+implement a protocol used on the HSI interface. These client drivers can
+use an arbitrary number of channels.
+
+hsi-char Device
+------------------
+
+Each port automatically registers a generic client driver called hsi_char,
+which provides a character device for userspace representing the HSI port.
+It can be used to communicate via HSI from userspace. Userspace may
+configure the hsi_char device using the following ioctl commands:
+
+HSC_RESET
+ flush the HSI port
+
+HSC_SET_PM
+ enable or disable the client.
+
+HSC_SEND_BREAK
+ send break
+
+HSC_SET_RX
+ set RX configuration
+
+HSC_GET_RX
+ get RX configuration
+
+HSC_SET_TX
+ set TX configuration
+
+HSC_GET_TX
+ get TX configuration
+
+The kernel HSI API
+------------------
+
+.. kernel-doc:: include/linux/hsi/hsi.h
+ :internal:
+
+.. kernel-doc:: drivers/hsi/hsi_core.c
+ :export:
+
diff --git a/Documentation/driver-api/hte/hte.rst b/Documentation/driver-api/hte/hte.rst
new file mode 100644
index 0000000000..153f3233c1
--- /dev/null
+++ b/Documentation/driver-api/hte/hte.rst
@@ -0,0 +1,79 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+============================================
+The Linux Hardware Timestamping Engine (HTE)
+============================================
+
+:Author: Dipen Patel
+
+Introduction
+------------
+
+Certain devices have built in hardware timestamping engines which can
+monitor sets of system signals, lines, buses etc... in realtime for state
+change; upon detecting the change they can automatically store the timestamp at
+the moment of occurrence. Such functionality may help achieve better accuracy
+in obtaining timestamps than using software counterparts i.e. ktime and
+friends.
+
+This document describes the API that can be used by hardware timestamping
+engine provider and consumer drivers that want to use the hardware timestamping
+engine (HTE) framework. Both consumers and providers must include
+``#include <linux/hte.h>``.
+
+The HTE framework APIs for the providers
+----------------------------------------
+
+.. kernel-doc:: drivers/hte/hte.c
+ :functions: devm_hte_register_chip hte_push_ts_ns
+
+The HTE framework APIs for the consumers
+----------------------------------------
+
+.. kernel-doc:: drivers/hte/hte.c
+ :functions: hte_init_line_attr hte_ts_get hte_ts_put devm_hte_request_ts_ns hte_request_ts_ns hte_enable_ts hte_disable_ts of_hte_req_count hte_get_clk_src_info
+
+The HTE framework public structures
+-----------------------------------
+.. kernel-doc:: include/linux/hte.h
+
+More on the HTE timestamp data
+------------------------------
+The ``struct hte_ts_data`` is used to pass timestamp details between the
+consumers and the providers. It expresses timestamp data in nanoseconds in
+u64. An example of the typical timestamp data life cycle, for the GPIO line is
+as follows::
+
+ - Monitors GPIO line change.
+ - Detects the state change on GPIO line.
+ - Converts timestamps in nanoseconds.
+ - Stores GPIO raw level in raw_level variable if the provider has that
+ hardware capability.
+ - Pushes this hte_ts_data object to HTE subsystem.
+ - HTE subsystem increments seq counter and invokes consumer provided callback.
+ Based on callback return value, the HTE core invokes secondary callback in
+ the thread context.
+
+HTE subsystem debugfs attributes
+--------------------------------
+HTE subsystem creates debugfs attributes at ``/sys/kernel/debug/hte/``.
+It also creates line/signal-related debugfs attributes at
+``/sys/kernel/debug/hte/<provider>/<label or line id>/``. Note that these
+attributes are read-only.
+
+`ts_requested`
+ The total number of entities requested from the given provider,
+ where entity is specified by the provider and could represent
+ lines, GPIO, chip signals, buses etc...
+ The attribute will be available at
+ ``/sys/kernel/debug/hte/<provider>/``.
+
+`total_ts`
+ The total number of entities supported by the provider.
+ The attribute will be available at
+ ``/sys/kernel/debug/hte/<provider>/``.
+
+`dropped_timestamps`
+ The dropped timestamps for a given line.
+ The attribute will be available at
+ ``/sys/kernel/debug/hte/<provider>/<label or line id>/``.
diff --git a/Documentation/driver-api/hte/index.rst b/Documentation/driver-api/hte/index.rst
new file mode 100644
index 0000000000..29011de9a4
--- /dev/null
+++ b/Documentation/driver-api/hte/index.rst
@@ -0,0 +1,22 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+============================================
+The Linux Hardware Timestamping Engine (HTE)
+============================================
+
+The HTE Subsystem
+=================
+
+.. toctree::
+ :maxdepth: 1
+
+ hte
+
+HTE Tegra Provider
+==================
+
+.. toctree::
+ :maxdepth: 1
+
+ tegra-hte
+
diff --git a/Documentation/driver-api/hte/tegra-hte.rst b/Documentation/driver-api/hte/tegra-hte.rst
new file mode 100644
index 0000000000..85e6547727
--- /dev/null
+++ b/Documentation/driver-api/hte/tegra-hte.rst
@@ -0,0 +1,47 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+HTE Kernel provider driver
+==========================
+
+Description
+-----------
+The Nvidia tegra HTE provider also known as GTE (Generic Timestamping Engine)
+driver implements two GTE instances: 1) GPIO GTE and 2) LIC
+(Legacy Interrupt Controller) IRQ GTE. Both GTE instances get the timestamp
+from the system counter TSC which has 31.25MHz clock rate, and the driver
+converts clock tick rate to nanoseconds before storing it as timestamp value.
+
+GPIO GTE
+--------
+
+This GTE instance timestamps GPIO in real time. For that to happen GPIO
+needs to be configured as input. Only the always on (AON) GPIO controller
+instance supports timestamping GPIOs in real time as it is tightly coupled with
+the GPIO GTE. To support this, GPIOLIB adds two optional APIs as mentioned
+below. The GPIO GTE code supports both kernel and userspace consumers. The
+kernel space consumers can directly talk to HTE subsystem while userspace
+consumers timestamp requests go through GPIOLIB CDEV framework to HTE
+subsystem. The hte devicetree binding described at
+``Documentation/devicetree/bindings/timestamp`` provides an example of how a
+consumer can request an GPIO line.
+
+See gpiod_enable_hw_timestamp_ns() and gpiod_disable_hw_timestamp_ns().
+
+For userspace consumers, GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE flag must be
+specified during IOCTL calls. Refer to ``tools/gpio/gpio-event-mon.c``, which
+returns the timestamp in nanoseconds.
+
+LIC (Legacy Interrupt Controller) IRQ GTE
+-----------------------------------------
+
+This GTE instance timestamps LIC IRQ lines in real time. The hte devicetree
+binding described at ``Documentation/devicetree/bindings/timestamp``
+provides an example of how a consumer can request an IRQ line. Since it is a
+one-to-one mapping with IRQ GTE provider, consumers can simply specify the IRQ
+number that they are interested in. There is no userspace consumer support for
+this GTE instance in the HTE framework.
+
+The provider source code of both IRQ and GPIO GTE instances is located at
+``drivers/hte/hte-tegra194.c``. The test driver
+``drivers/hte/hte-tegra194-test.c`` demonstrates HTE API usage for both IRQ
+and GPIO GTE.
diff --git a/Documentation/driver-api/i2c.rst b/Documentation/driver-api/i2c.rst
new file mode 100644
index 0000000000..7582c079d7
--- /dev/null
+++ b/Documentation/driver-api/i2c.rst
@@ -0,0 +1,48 @@
+I\ :sup:`2`\ C and SMBus Subsystem
+==================================
+
+I\ :sup:`2`\ C (or without fancy typography, "I2C") is an acronym for
+the "Inter-IC" bus, a simple bus protocol which is widely used where low
+data rate communications suffice. Since it's also a licensed trademark,
+some vendors use another name (such as "Two-Wire Interface", TWI) for
+the same bus. I2C only needs two signals (SCL for clock, SDA for data),
+conserving board real estate and minimizing signal quality issues. Most
+I2C devices use seven bit addresses, and bus speeds of up to 400 kHz;
+there's a high speed extension (3.4 MHz) that's not yet found wide use.
+I2C is a multi-master bus; open drain signaling is used to arbitrate
+between masters, as well as to handshake and to synchronize clocks from
+slower clients.
+
+The Linux I2C programming interfaces support the master side of bus
+interactions and the slave side. The programming interface is
+structured around two kinds of driver, and two kinds of device. An I2C
+"Adapter Driver" abstracts the controller hardware; it binds to a
+physical device (perhaps a PCI device or platform_device) and exposes a
+:c:type:`struct i2c_adapter <i2c_adapter>` representing each
+I2C bus segment it manages. On each I2C bus segment will be I2C devices
+represented by a :c:type:`struct i2c_client <i2c_client>`.
+Those devices will be bound to a :c:type:`struct i2c_driver
+<i2c_driver>`, which should follow the standard Linux driver model. There
+are functions to perform various I2C protocol operations; at this writing
+all such functions are usable only from task context.
+
+The System Management Bus (SMBus) is a sibling protocol. Most SMBus
+systems are also I2C conformant. The electrical constraints are tighter
+for SMBus, and it standardizes particular protocol messages and idioms.
+Controllers that support I2C can also support most SMBus operations, but
+SMBus controllers don't support all the protocol options that an I2C
+controller will. There are functions to perform various SMBus protocol
+operations, either using I2C primitives or by issuing SMBus commands to
+i2c_adapter devices which don't support those I2C operations.
+
+.. kernel-doc:: include/linux/i2c.h
+ :internal:
+
+.. kernel-doc:: drivers/i2c/i2c-boardinfo.c
+ :functions: i2c_register_board_info
+
+.. kernel-doc:: drivers/i2c/i2c-core-base.c
+ :export:
+
+.. kernel-doc:: drivers/i2c/i2c-core-smbus.c
+ :export:
diff --git a/Documentation/driver-api/i3c/device-driver-api.rst b/Documentation/driver-api/i3c/device-driver-api.rst
new file mode 100644
index 0000000000..85bc3381cd
--- /dev/null
+++ b/Documentation/driver-api/i3c/device-driver-api.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=====================
+I3C device driver API
+=====================
+
+.. kernel-doc:: include/linux/i3c/device.h
+
+.. kernel-doc:: drivers/i3c/device.c
diff --git a/Documentation/driver-api/i3c/index.rst b/Documentation/driver-api/i3c/index.rst
new file mode 100644
index 0000000000..783d6dad05
--- /dev/null
+++ b/Documentation/driver-api/i3c/index.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=============
+I3C subsystem
+=============
+
+.. toctree::
+
+ protocol
+ device-driver-api
+ master-driver-api
diff --git a/Documentation/driver-api/i3c/master-driver-api.rst b/Documentation/driver-api/i3c/master-driver-api.rst
new file mode 100644
index 0000000000..332552b283
--- /dev/null
+++ b/Documentation/driver-api/i3c/master-driver-api.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+================================
+I3C master controller driver API
+================================
+
+.. kernel-doc:: drivers/i3c/master.c
+
+.. kernel-doc:: include/linux/i3c/master.h
diff --git a/Documentation/driver-api/i3c/protocol.rst b/Documentation/driver-api/i3c/protocol.rst
new file mode 100644
index 0000000000..02653defa0
--- /dev/null
+++ b/Documentation/driver-api/i3c/protocol.rst
@@ -0,0 +1,203 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+============
+I3C protocol
+============
+
+Disclaimer
+==========
+
+This chapter will focus on aspects that matter to software developers. For
+everything hardware related (like how things are transmitted on the bus, how
+collisions are prevented, ...) please have a look at the I3C specification.
+
+This document is just a brief introduction to the I3C protocol and the concepts
+it brings to the table. If you need more information, please refer to the MIPI
+I3C specification (can be downloaded here
+https://resources.mipi.org/mipi-i3c-v1-download).
+
+Introduction
+============
+
+The I3C (pronounced 'eye-three-see') is a MIPI standardized protocol designed
+to overcome I2C limitations (limited speed, external signals needed for
+interrupts, no automatic detection of the devices connected to the bus, ...)
+while remaining power-efficient.
+
+I3C Bus
+=======
+
+An I3C bus is made of several I3C devices and possibly some I2C devices as
+well, but let's focus on I3C devices for now.
+
+An I3C device on the I3C bus can have one of the following roles:
+
+* Master: the device is driving the bus. It's the one in charge of initiating
+ transactions or deciding who is allowed to talk on the bus (slave generated
+ events are possible in I3C, see below).
+* Slave: the device acts as a slave, and is not able to send frames to another
+ slave on the bus. The device can still send events to the master on
+ its own initiative if the master allowed it.
+
+I3C is a multi-master protocol, so there might be several masters on a bus,
+though only one device can act as a master at a given time. In order to gain
+bus ownership, a master has to follow a specific procedure.
+
+Each device on the I3C bus has to be assigned a dynamic address to be able to
+communicate. Until this is done, the device should only respond to a limited
+set of commands. If it has a static address (also called legacy I2C address),
+the device can reply to I2C transfers.
+
+In addition to these per-device addresses, the protocol defines a broadcast
+address in order to address all devices on the bus.
+
+Once a dynamic address has been assigned to a device, this address will be used
+for any direct communication with the device. Note that even after being
+assigned a dynamic address, the device should still process broadcast messages.
+
+I3C Device discovery
+====================
+
+The I3C protocol defines a mechanism to automatically discover devices present
+on the bus, their capabilities and the functionalities they provide. In this
+regard I3C is closer to a discoverable bus like USB than it is to I2C or SPI.
+
+The discovery mechanism is called DAA (Dynamic Address Assignment), because it
+not only discovers devices but also assigns them a dynamic address.
+
+During DAA, each I3C device reports 3 important things:
+
+* BCR: Bus Characteristic Register. This 8-bit register describes the device bus
+ related capabilities
+* DCR: Device Characteristic Register. This 8-bit register describes the
+ functionalities provided by the device
+* Provisional ID: A 48-bit unique identifier. On a given bus there should be no
+ Provisional ID collision, otherwise the discovery mechanism may fail.
+
+I3C slave events
+================
+
+The I3C protocol allows slaves to generate events on their own, and thus allows
+them to take temporary control of the bus.
+
+This mechanism is called IBI for In Band Interrupts, and as stated in the name,
+it allows devices to generate interrupts without requiring an external signal.
+
+During DAA, each device on the bus has been assigned an address, and this
+address will serve as a priority identifier to determine who wins if 2 different
+devices are generating an interrupt at the same moment on the bus (the lower the
+dynamic address the higher the priority).
+
+Masters are allowed to inhibit interrupts if they want to. This inhibition
+request can be broadcast (applies to all devices) or sent to a specific
+device.
+
+I3C Hot-Join
+============
+
+The Hot-Join mechanism is similar to USB hotplug. This mechanism allows
+slaves to join the bus after it has been initialized by the master.
+
+This covers the following use cases:
+
+* the device is not powered when the bus is probed
+* the device is hotplugged on the bus through an extension board
+
+This mechanism is relying on slave events to inform the master that a new
+device joined the bus and is waiting for a dynamic address.
+
+The master is then free to address the request as it wishes: ignore it or
+assign a dynamic address to the slave.
+
+I3C transfer types
+==================
+
+If you omit SMBus (which is just a standardization on how to access registers
+exposed by I2C devices), I2C has only one transfer type.
+
+I3C defines 3 different classes of transfer in addition to I2C transfers which
+are here for backward compatibility with I2C devices.
+
+I3C CCC commands
+----------------
+
+CCC (Common Command Code) commands are meant to be used for anything that is
+related to bus management and all features that are common to a set of devices.
+
+CCC commands contain an 8-bit CCC ID describing the command that is executed.
+The MSB of this ID specifies whether this is a broadcast command (bit7 = 0) or a
+unicast one (bit7 = 1).
+
+The command ID can be followed by a payload. Depending on the command, this
+payload is either sent by the master sending the command (write CCC command),
+or sent by the slave receiving the command (read CCC command). Of course, read
+accesses only apply to unicast commands.
+Note that, when sending a CCC command to a specific device, the device address
+is passed in the first byte of the payload.
+
+The payload length is not explicitly passed on the bus, and should be extracted
+from the CCC ID.
+
+Note that vendors can use a dedicated range of CCC IDs for their own commands
+(0x61-0x7f and 0xe0-0xef).
+
+I3C Private SDR transfers
+-------------------------
+
+Private SDR (Single Data Rate) transfers should be used for anything that is
+device specific and does not require high transfer speed.
+
+It is the equivalent of I2C transfers but in the I3C world. Each transfer is
+passed the device address (dynamic address assigned during DAA), a payload
+and a direction.
+
+The only difference with I2C is that the transfer is much faster (typical clock
+frequency is 12.5MHz).
+
+I3C HDR commands
+----------------
+
+HDR commands should be used for anything that is device specific and requires
+high transfer speed.
+
+The first thing attached to an HDR command is the HDR mode. There are currently
+3 different modes defined by the I3C specification (refer to the specification
+for more details):
+
+* HDR-DDR: Double Data Rate mode
+* HDR-TSP: Ternary Symbol Pure. Only usable on busses with no I2C devices
+* HDR-TSL: Ternary Symbol Legacy. Usable on busses with I2C devices
+
+When sending an HDR command, the whole bus has to enter HDR mode, which is done
+using a broadcast CCC command.
+Once the bus has entered a specific HDR mode, the master sends the HDR command.
+An HDR command is made of:
+
+* one 16-bits command word in big endian
+* N 16-bits data words in big endian
+
+Those words may be wrapped with specific preambles/post-ambles which depend on
+the chosen HDR mode and are detailed here (see the specification for more
+details).
+
+The 16-bits command word is made of:
+
+* bit[15]: direction bit, read is 1, write is 0
+* bit[14:8]: command code. Identifies the command being executed, the amount of
+ data words and their meaning
+* bit[7:1]: I3C address of the device this command is addressed to
+* bit[0]: reserved/parity-bit
+
+Backward compatibility with I2C devices
+=======================================
+
+The I3C protocol has been designed to be backward compatible with I2C devices.
+This backward compatibility allows one to connect a mix of I2C and I3C devices
+on the same bus, though, in order to be really efficient, I2C devices should
+be equipped with 50 ns spike filters.
+
+I2C devices can't be discovered like I3C ones and have to be statically
+declared. In order to let the master know what these devices are capable of
+(both in terms of bus related limitations and functionalities), the software
+has to provide some information, which is done through the LVR (Legacy I2C
+Virtual Register).
diff --git a/Documentation/driver-api/iio/buffers.rst b/Documentation/driver-api/iio/buffers.rst
new file mode 100644
index 0000000000..e83026aebe
--- /dev/null
+++ b/Documentation/driver-api/iio/buffers.rst
@@ -0,0 +1,126 @@
+=======
+Buffers
+=======
+
+* struct iio_buffer — general buffer structure
+* :c:func:`iio_validate_scan_mask_onehot` — Validates that exactly one channel
+ is selected
+* :c:func:`iio_buffer_get` — Grab a reference to the buffer
+* :c:func:`iio_buffer_put` — Release the reference to the buffer
+
+The Industrial I/O core offers a way for continuous data capture based on a
+trigger source. Multiple data channels can be read at once from
+:file:`/dev/iio:device{X}` character device node, thus reducing the CPU load.
+
+IIO buffer sysfs interface
+==========================
+An IIO buffer has an associated attributes directory under
+:file:`/sys/bus/iio/iio:device{X}/buffer/*`. Here are some of the existing
+attributes:
+
+* :file:`length`, the total number of data samples (capacity) that can be
+ stored by the buffer.
+* :file:`enable`, activate buffer capture.
+
+IIO buffer setup
+================
+
+The meta information associated with a channel reading placed in a buffer is
+called a scan element. The important bits configuring scan elements are
+exposed to userspace applications via the
+:file:`/sys/bus/iio/iio:device{X}/scan_elements/` directory. This directory contains
+attributes of the following form:
+
+* :file:`enable`, used for enabling a channel. If and only if its attribute
+ is non *zero*, then a triggered capture will contain data samples for this
+ channel.
+* :file:`index`, the scan_index of the channel.
+* :file:`type`, description of the scan element data storage within the buffer
+ and hence the form in which it is read from user space.
+ Format is [be|le]:[s|u]bits/storagebits[Xrepeat][>>shift] .
+
+ * *be* or *le*, specifies big or little endian.
+ * *s* or *u*, specifies if signed (2's complement) or unsigned.
+ * *bits*, is the number of valid data bits.
+ * *storagebits*, is the number of bits (after padding) that it occupies in the
+ buffer.
+ * *repeat*, specifies the number of bits/storagebits repetitions. When the
+ repeat element is 0 or 1, then the repeat value is omitted.
+ * *shift*, if specified, is the shift that needs to be applied prior to
+ masking out unused bits.
+
+For example, a driver for a 3-axis accelerometer with 12 bit resolution where
+data is stored in two 8-bits registers as follows::
+
+ 7 6 5 4 3 2 1 0
+ +---+---+---+---+---+---+---+---+
+ |D3 |D2 |D1 |D0 | X | X | X | X | (LOW byte, address 0x06)
+ +---+---+---+---+---+---+---+---+
+
+ 7 6 5 4 3 2 1 0
+ +---+---+---+---+---+---+---+---+
+ |D11|D10|D9 |D8 |D7 |D6 |D5 |D4 | (HIGH byte, address 0x07)
+ +---+---+---+---+---+---+---+---+
+
+will have the following scan element type for each axis::
+
+ $ cat /sys/bus/iio/devices/iio:device0/scan_elements/in_accel_y_type
+ le:s12/16>>4
+
+A user space application will interpret data samples read from the buffer as
+two byte little endian signed data, that needs a 4 bits right shift before
+masking out the 12 valid bits of data.
+
+For implementing buffer support a driver should initialize the following
+fields in iio_chan_spec definition::
+
+ struct iio_chan_spec {
+ /* other members */
+ int scan_index
+ struct {
+ char sign;
+ u8 realbits;
+ u8 storagebits;
+ u8 shift;
+ u8 repeat;
+ enum iio_endian endianness;
+ } scan_type;
+ };
+
+The driver implementing the accelerometer described above will have the
+following channel definition::
+
+ struct iio_chan_spec accel_channels[] = {
+ {
+ .type = IIO_ACCEL,
+ .modified = 1,
+ .channel2 = IIO_MOD_X,
+ /* other stuff here */
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 12,
+ .storagebits = 16,
+ .shift = 4,
+ .endianness = IIO_LE,
+ },
+ }
+ /* similar for Y (with channel2 = IIO_MOD_Y, scan_index = 1)
+ * and Z (with channel2 = IIO_MOD_Z, scan_index = 2) axis
+ */
+ }
+
+Here **scan_index** defines the order in which the enabled channels are placed
+inside the buffer. Channels with a lower **scan_index** will be placed before
+channels with a higher index. Each channel needs to have a unique
+**scan_index**.
+
+Setting **scan_index** to -1 can be used to indicate that the specific channel
+does not support buffered capture. In this case no entries will be created for
+the channel in the scan_elements directory.
+
+More details
+============
+.. kernel-doc:: include/linux/iio/buffer.h
+.. kernel-doc:: drivers/iio/industrialio-buffer.c
+ :export:
diff --git a/Documentation/driver-api/iio/core.rst b/Documentation/driver-api/iio/core.rst
new file mode 100644
index 0000000000..715cf29482
--- /dev/null
+++ b/Documentation/driver-api/iio/core.rst
@@ -0,0 +1,182 @@
+=============
+Core elements
+=============
+
+The Industrial I/O core offers both a unified framework for writing drivers for
+many different types of embedded sensors and a standard interface to user space
+applications manipulating sensors. The implementation can be found under
+:file:`drivers/iio/industrialio-*`
+
+Industrial I/O Devices
+----------------------
+
+* struct iio_dev - industrial I/O device
+* iio_device_alloc() - allocate an :c:type:`iio_dev` from a driver
+* iio_device_free() - free an :c:type:`iio_dev` from a driver
+* iio_device_register() - register a device with the IIO subsystem
+* iio_device_unregister() - unregister a device from the IIO
+ subsystem
+
+An IIO device usually corresponds to a single hardware sensor and it
+provides all the information needed by a driver handling a device.
+Let's first have a look at the functionality embedded in an IIO device
+then we will show how a device driver makes use of an IIO device.
+
+There are two ways for a user space application to interact with an IIO driver.
+
+1. :file:`/sys/bus/iio/iio:device{X}/`, this represents a hardware sensor
+ and groups together the data channels of the same chip.
+2. :file:`/dev/iio:device{X}`, character device node interface used for
+ buffered data transfer and for events information retrieval.
+
+A typical IIO driver will register itself as an :doc:`I2C <../i2c>` or
+:doc:`SPI <../spi>` driver and will create two routines, probe and remove.
+
+At probe:
+
+1. Call iio_device_alloc(), which allocates memory for an IIO device.
+2. Initialize IIO device fields with driver specific information (e.g.
+ device name, device channels).
+3. Call iio_device_register(), this registers the device with the
+ IIO core. After this call the device is ready to accept requests from user
+ space applications.
+
+At remove, we free the resources allocated in probe in reverse order:
+
+1. iio_device_unregister(), unregister the device from the IIO core.
+2. iio_device_free(), free the memory allocated for the IIO device.
+
+IIO device sysfs interface
+==========================
+
+Attributes are sysfs files used to expose chip info and also allowing
+applications to set various configuration parameters. For device with
+index X, attributes can be found under /sys/bus/iio/iio:deviceX/ directory.
+Common attributes are:
+
+* :file:`name`, description of the physical chip.
+* :file:`dev`, shows the major:minor pair associated with
+ :file:`/dev/iio:deviceX` node.
+* :file:`sampling_frequency_available`, available discrete set of sampling
+ frequency values for device.
+* Available standard attributes for IIO devices are described in the
+ :file:`Documentation/ABI/testing/sysfs-bus-iio` file in the Linux kernel
+ sources.
+
+IIO device channels
+===================
+
+struct iio_chan_spec - specification of a single channel
+
+An IIO device channel is a representation of a data channel. An IIO device can
+have one or multiple channels. For example:
+
+* a thermometer sensor has one channel representing the temperature measurement.
+* a light sensor with two channels indicating the measurements in the visible
+ and infrared spectrum.
+* an accelerometer can have up to 3 channels representing acceleration on X, Y
+ and Z axes.
+
+An IIO channel is described by the struct iio_chan_spec.
+A thermometer driver for the temperature sensor in the example above would
+have to describe its channel as follows::
+
+ static const struct iio_chan_spec temp_channel[] = {
+ {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ },
+ };
+
+Channel sysfs attributes exposed to userspace are specified in the form of
+bitmasks. Depending on their shared info, attributes can be set in one of the
+following masks:
+
+* **info_mask_separate**, attributes will be specific to
+ this channel
+* **info_mask_shared_by_type**, attributes are shared by all channels of the
+ same type
+* **info_mask_shared_by_dir**, attributes are shared by all channels of the same
+ direction
+* **info_mask_shared_by_all**, attributes are shared by all channels
+
+When there are multiple data channels per channel type we have two ways to
+distinguish between them:
+
+* set **.modified** field of :c:type:`iio_chan_spec` to 1. Modifiers are
+ specified using **.channel2** field of the same :c:type:`iio_chan_spec`
+ structure and are used to indicate a physically unique characteristic of the
+ channel such as its direction or spectral response. For example, a light
+ sensor can have two channels, one for infrared light and one for both
+ infrared and visible light.
+* set **.indexed** field of :c:type:`iio_chan_spec` to 1. In this case the
+ channel is simply another instance with an index specified by the **.channel**
+ field.
+
+Here is how we can make use of the channel's modifiers::
+
+ static const struct iio_chan_spec light_channels[] = {
+ {
+ .type = IIO_INTENSITY,
+ .modified = 1,
+ .channel2 = IIO_MOD_LIGHT_IR,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ },
+ {
+ .type = IIO_INTENSITY,
+ .modified = 1,
+ .channel2 = IIO_MOD_LIGHT_BOTH,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ },
+ {
+ .type = IIO_LIGHT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .info_mask_shared = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ },
+ }
+
+This channel's definition will generate two separate sysfs files for raw data
+retrieval:
+
+* :file:`/sys/bus/iio/iio:device{X}/in_intensity_ir_raw`
+* :file:`/sys/bus/iio/iio:device{X}/in_intensity_both_raw`
+
+one file for processed data:
+
+* :file:`/sys/bus/iio/iio:device{X}/in_illuminance_input`
+
+and one shared sysfs file for sampling frequency:
+
+* :file:`/sys/bus/iio/iio:device{X}/sampling_frequency`.
+
+Here is how we can make use of the channel's indexing::
+
+ static const struct iio_chan_spec light_channels[] = {
+ {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ },
+ {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ },
+ }
+
+This will generate two separate attributes files for raw data retrieval:
+
+* :file:`/sys/bus/iio/devices/iio:device{X}/in_voltage0_raw`, representing
+ voltage measurement for channel 0.
+* :file:`/sys/bus/iio/devices/iio:device{X}/in_voltage1_raw`, representing
+ voltage measurement for channel 1.
+
+More details
+============
+.. kernel-doc:: include/linux/iio/iio.h
+.. kernel-doc:: drivers/iio/industrialio-core.c
+ :export:
diff --git a/Documentation/driver-api/iio/hw-consumer.rst b/Documentation/driver-api/iio/hw-consumer.rst
new file mode 100644
index 0000000000..76133a3796
--- /dev/null
+++ b/Documentation/driver-api/iio/hw-consumer.rst
@@ -0,0 +1,50 @@
+===========
+HW consumer
+===========
+An IIO device can be directly connected to another device in hardware. In this
+case the buffers between IIO provider and IIO consumer are handled by hardware.
+The Industrial I/O HW consumer offers a way to bond these IIO devices without
+software buffer for data. The implementation can be found under
+:file:`drivers/iio/buffer/hw-consumer.c`
+
+
+* struct iio_hw_consumer — Hardware consumer structure
+* :c:func:`iio_hw_consumer_alloc` — Allocate IIO hardware consumer
+* :c:func:`iio_hw_consumer_free` — Free IIO hardware consumer
+* :c:func:`iio_hw_consumer_enable` — Enable IIO hardware consumer
+* :c:func:`iio_hw_consumer_disable` — Disable IIO hardware consumer
+
+
+HW consumer setup
+=================
+
+As standard IIO device the implementation is based on IIO provider/consumer.
+A typical IIO HW consumer setup looks like this::
+
+ static struct iio_hw_consumer *hwc;
+
+ static const struct iio_info adc_info = {
+ .read_raw = adc_read_raw,
+ };
+
+ static int adc_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+ {
+ ret = iio_hw_consumer_enable(hwc);
+
+ /* Acquire data */
+
+ ret = iio_hw_consumer_disable(hwc);
+ }
+
+ static int adc_probe(struct platform_device *pdev)
+ {
+ hwc = devm_iio_hw_consumer_alloc(&iio->dev);
+ }
+
+More details
+============
+.. kernel-doc:: drivers/iio/buffer/industrialio-hw-consumer.c
+ :export:
+
diff --git a/Documentation/driver-api/iio/index.rst b/Documentation/driver-api/iio/index.rst
new file mode 100644
index 0000000000..7fba341bd8
--- /dev/null
+++ b/Documentation/driver-api/iio/index.rst
@@ -0,0 +1,18 @@
+.. include:: <isonum.txt>
+
+Industrial I/O
+==============
+
+**Copyright** |copy| 2015 Intel Corporation
+
+Contents:
+
+.. toctree::
+ :maxdepth: 2
+
+ intro
+ core
+ buffers
+ triggers
+ triggered-buffers
+ hw-consumer
diff --git a/Documentation/driver-api/iio/intro.rst b/Documentation/driver-api/iio/intro.rst
new file mode 100644
index 0000000000..3653fbd570
--- /dev/null
+++ b/Documentation/driver-api/iio/intro.rst
@@ -0,0 +1,33 @@
+.. include:: <isonum.txt>
+
+============
+Introduction
+============
+
+The main purpose of the Industrial I/O subsystem (IIO) is to provide support
+for devices that in some sense perform either
+analog-to-digital conversion (ADC) or digital-to-analog conversion (DAC)
+or both. The aim is to fill the gap between the somewhat similar hwmon and
+:doc:`input <../input>` subsystems. Hwmon is directed at low sample rate
+sensors used to monitor and control the system itself, like fan speed control
+or temperature measurement. :doc:`Input <../input>` is, as its name suggests,
+focused on human interaction input devices (keyboard, mouse, touchscreen).
+In some cases there is considerable overlap between these and IIO.
+
+Devices that fall into this category include:
+
+* analog to digital converters (ADCs)
+* accelerometers
+* capacitance to digital converters (CDCs)
+* digital to analog converters (DACs)
+* gyroscopes
+* inertial measurement units (IMUs)
+* color and light sensors
+* magnetometers
+* pressure sensors
+* proximity sensors
+* temperature sensors
+
+Usually these sensors are connected via :doc:`SPI <../spi>` or
+:doc:`I2C <../i2c>`. A common use case of the sensors devices is to have
+combined functionality (e.g. light plus proximity sensor).
diff --git a/Documentation/driver-api/iio/triggered-buffers.rst b/Documentation/driver-api/iio/triggered-buffers.rst
new file mode 100644
index 0000000000..417555dbbd
--- /dev/null
+++ b/Documentation/driver-api/iio/triggered-buffers.rst
@@ -0,0 +1,69 @@
+=================
+Triggered Buffers
+=================
+
+Now that we know what buffers and triggers are let's see how they work together.
+
+IIO triggered buffer setup
+==========================
+
+* :c:func:`iio_triggered_buffer_setup` — Setup triggered buffer and pollfunc
+* :c:func:`iio_triggered_buffer_cleanup` — Free resources allocated by
+ :c:func:`iio_triggered_buffer_setup`
+* struct iio_buffer_setup_ops — buffer setup related callbacks
+
+A typical triggered buffer setup looks like this::
+
+ const struct iio_buffer_setup_ops sensor_buffer_setup_ops = {
+ .preenable = sensor_buffer_preenable,
+ .postenable = sensor_buffer_postenable,
+ .postdisable = sensor_buffer_postdisable,
+ .predisable = sensor_buffer_predisable,
+ };
+
+ irqreturn_t sensor_iio_pollfunc(int irq, void *p)
+ {
+ pf->timestamp = iio_get_time_ns((struct indio_dev *)p);
+ return IRQ_WAKE_THREAD;
+ }
+
+ irqreturn_t sensor_trigger_handler(int irq, void *p)
+ {
+ u16 buf[8];
+ int i = 0;
+
+ /* read data for each active channel */
+ for_each_set_bit(bit, active_scan_mask, masklength)
+ buf[i++] = sensor_get_data(bit)
+
+ iio_push_to_buffers_with_timestamp(indio_dev, buf, timestamp);
+
+ iio_trigger_notify_done(trigger);
+ return IRQ_HANDLED;
+ }
+
+ /* setup triggered buffer, usually in probe function */
+ iio_triggered_buffer_setup(indio_dev, sensor_iio_polfunc,
+ sensor_trigger_handler,
+ sensor_buffer_setup_ops);
+
+The important things to notice here are:
+
+* :c:type:`iio_buffer_setup_ops`, the buffer setup functions to be called at
+ predefined points in the buffer configuration sequence (e.g. before enable,
+ after disable). If not specified, the IIO core uses the default
+ iio_triggered_buffer_setup_ops.
+* **sensor_iio_pollfunc**, the function that will be used as top half of poll
+ function. It should do as little processing as possible, because it runs in
+ interrupt context. The most common operation is recording of the current
+ timestamp and for this reason one can use the IIO core defined
+ :c:func:`iio_pollfunc_store_time` function.
+* **sensor_trigger_handler**, the function that will be used as bottom half of
+ the poll function. This runs in the context of a kernel thread and all the
+ processing takes place here. It usually reads data from the device and
+ stores it in the internal buffer together with the timestamp recorded in the
+ top half.
+
+More details
+============
+.. kernel-doc:: drivers/iio/buffer/industrialio-triggered-buffer.c
diff --git a/Documentation/driver-api/iio/triggers.rst b/Documentation/driver-api/iio/triggers.rst
new file mode 100644
index 0000000000..288625e406
--- /dev/null
+++ b/Documentation/driver-api/iio/triggers.rst
@@ -0,0 +1,78 @@
+========
+Triggers
+========
+
+* struct iio_trigger — industrial I/O trigger device
+* :c:func:`devm_iio_trigger_alloc` — Resource-managed iio_trigger_alloc
+* :c:func:`devm_iio_trigger_register` — Resource-managed iio_trigger_register
+ iio_trigger_unregister
+* :c:func:`iio_trigger_validate_own_device` — Check if a trigger and IIO
+ device belong to the same device
+
+In many situations it is useful for a driver to be able to capture data based
+on some external event (trigger) as opposed to periodically polling for data.
+An IIO trigger can be provided by a device driver that also has an IIO device
+based on hardware generated events (e.g. data ready or threshold exceeded) or
+provided by a separate driver from an independent interrupt source (e.g. GPIO
+line connected to some external system, timer interrupt or user space writing
+a specific file in sysfs). A trigger may initiate data capture for a number of
+sensors and also it may be completely unrelated to the sensor itself.
+
+IIO trigger sysfs interface
+===========================
+
+There are two locations in sysfs related to triggers:
+
+* :file:`/sys/bus/iio/devices/trigger{Y}/*`, this file is created once an
+ IIO trigger is registered with the IIO core and corresponds to trigger
+ with index Y.
+ Because triggers can be very different depending on type there are few
+ standard attributes that we can describe here:
+
+ * :file:`name`, trigger name that can be later used for association with a
+ device.
+ * :file:`sampling_frequency`, some timer based triggers use this attribute to
+ specify the frequency for trigger calls.
+
+* :file:`/sys/bus/iio/devices/iio:device{X}/trigger/*`, this directory is
+ created once the device supports a triggered buffer. We can associate a
+ trigger with our device by writing the trigger's name in the
+ :file:`current_trigger` file.
+
+IIO trigger setup
+=================
+
+Let's see a simple example of how to setup a trigger to be used by a driver::
+
+ struct iio_trigger_ops trigger_ops = {
+ .set_trigger_state = sample_trigger_state,
+ .validate_device = sample_validate_device,
+ }
+
+ struct iio_trigger *trig;
+
+ /* first, allocate memory for our trigger */
+ trig = iio_trigger_alloc(dev, "trig-%s-%d", name, idx);
+
+ /* setup trigger operations field */
+ trig->ops = &trigger_ops;
+
+ /* now register the trigger with the IIO core */
+ iio_trigger_register(trig);
+
+IIO trigger ops
+===============
+
+* struct iio_trigger_ops — operations structure for an iio_trigger.
+
+Notice that a trigger has a set of operations attached:
+
+* :file:`set_trigger_state`, switch the trigger on/off on demand.
+* :file:`validate_device`, function to validate the device when the current
+ trigger gets changed.
+
+More details
+============
+.. kernel-doc:: include/linux/iio/trigger.h
+.. kernel-doc:: drivers/iio/industrialio-trigger.c
+ :export:
diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst
new file mode 100644
index 0000000000..1e16a40da3
--- /dev/null
+++ b/Documentation/driver-api/index.rst
@@ -0,0 +1,123 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============================
+Driver implementer's API guide
+==============================
+
+The kernel offers a wide variety of interfaces to support the development
+of device drivers. This document is an only somewhat organized collection
+of some of those interfaces — it will hopefully get better over time! The
+available subsections can be seen below.
+
+.. class:: toc-title
+
+ Table of contents
+
+.. toctree::
+ :maxdepth: 2
+
+ driver-model/index
+ basics
+ infrastructure
+ ioctl
+ early-userspace/index
+ pm/index
+ clk
+ device-io
+ dma-buf
+ device_link
+ component
+ message-based
+ infiniband
+ aperture
+ frame-buffer
+ regulator
+ reset
+ iio/index
+ input
+ usb/index
+ firewire
+ pci/index
+ cxl/index
+ spi
+ i2c
+ ipmb
+ ipmi
+ i3c/index
+ interconnect
+ devfreq
+ hsi
+ edac
+ scsi
+ libata
+ target
+ mailbox
+ mtdnand
+ miscellaneous
+ mei/index
+ mtd/index
+ mmc/index
+ nvdimm/index
+ w1
+ rapidio/index
+ s390-drivers
+ vme
+ 80211/index
+ uio-howto
+ firmware/index
+ pin-control
+ gpio/index
+ md/index
+ media/index
+ misc_devices
+ nfc/index
+ dmaengine/index
+ slimbus
+ soundwire/index
+ thermal/index
+ fpga/index
+ acpi/index
+ auxiliary_bus
+ backlight/lp855x-driver.rst
+ connector
+ console
+ dcdbas
+ eisa
+ isa
+ isapnp
+ io-mapping
+ io_ordering
+ generic-counter
+ memory-devices/index
+ men-chameleon-bus
+ ntb
+ nvmem
+ parport-lowlevel
+ pps
+ ptp
+ phy/index
+ pwm
+ pldmfw/index
+ rfkill
+ serial/index
+ sm501
+ surface_aggregator/index
+ switchtec
+ sync_file
+ tty/index
+ vfio-mediated-device
+ vfio
+ vfio-pci-device-specific-driver-acceptance
+ virtio/index
+ xilinx/index
+ xillybus
+ zorro
+ hte/index
+ wmi
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/infiniband.rst b/Documentation/driver-api/infiniband.rst
new file mode 100644
index 0000000000..30e142ccbe
--- /dev/null
+++ b/Documentation/driver-api/infiniband.rst
@@ -0,0 +1,124 @@
+===========================================
+InfiniBand and Remote DMA (RDMA) Interfaces
+===========================================
+
+Introduction and Overview
+=========================
+
+TBD
+
+InfiniBand core interfaces
+==========================
+
+.. kernel-doc:: drivers/infiniband/core/iwpm_util.h
+ :internal:
+
+.. kernel-doc:: drivers/infiniband/core/cq.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/core/cm.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/core/rw.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/core/device.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/core/verbs.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/core/packer.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/core/sa_query.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/core/ud_header.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/core/umem.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/core/umem_odp.c
+ :export:
+
+RDMA Verbs transport library
+============================
+
+.. kernel-doc:: drivers/infiniband/sw/rdmavt/mr.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/sw/rdmavt/rc.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/sw/rdmavt/ah.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/sw/rdmavt/vt.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/sw/rdmavt/cq.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/sw/rdmavt/qp.c
+ :export:
+
+.. kernel-doc:: drivers/infiniband/sw/rdmavt/mcast.c
+ :export:
+
+Upper Layer Protocols
+=====================
+
+iSCSI Extensions for RDMA (iSER)
+--------------------------------
+
+.. kernel-doc:: drivers/infiniband/ulp/iser/iscsi_iser.h
+ :internal:
+
+.. kernel-doc:: drivers/infiniband/ulp/iser/iscsi_iser.c
+ :functions: iscsi_iser_pdu_alloc iser_initialize_task_headers \
+ iscsi_iser_task_init iscsi_iser_mtask_xmit iscsi_iser_task_xmit \
+ iscsi_iser_cleanup_task iscsi_iser_check_protection \
+ iscsi_iser_conn_create iscsi_iser_conn_bind \
+ iscsi_iser_conn_start iscsi_iser_conn_stop \
+ iscsi_iser_session_destroy iscsi_iser_session_create \
+ iscsi_iser_set_param iscsi_iser_ep_connect iscsi_iser_ep_poll \
+ iscsi_iser_ep_disconnect
+
+.. kernel-doc:: drivers/infiniband/ulp/iser/iser_initiator.c
+ :internal:
+
+.. kernel-doc:: drivers/infiniband/ulp/iser/iser_verbs.c
+ :internal:
+
+Omni-Path (OPA) Virtual NIC support
+-----------------------------------
+
+.. kernel-doc:: drivers/infiniband/ulp/opa_vnic/opa_vnic_internal.h
+ :internal:
+
+.. kernel-doc:: drivers/infiniband/ulp/opa_vnic/opa_vnic_encap.h
+ :internal:
+
+.. kernel-doc:: drivers/infiniband/ulp/opa_vnic/opa_vnic_vema_iface.c
+ :internal:
+
+.. kernel-doc:: drivers/infiniband/ulp/opa_vnic/opa_vnic_vema.c
+ :internal:
+
+InfiniBand SCSI RDMA protocol target support
+--------------------------------------------
+
+.. kernel-doc:: drivers/infiniband/ulp/srpt/ib_srpt.h
+ :internal:
+
+.. kernel-doc:: drivers/infiniband/ulp/srpt/ib_srpt.c
+ :internal:
+
+iSCSI Extensions for RDMA (iSER) target support
+-----------------------------------------------
+
+.. kernel-doc:: drivers/infiniband/ulp/isert/ib_isert.c
+ :internal:
+
diff --git a/Documentation/driver-api/infrastructure.rst b/Documentation/driver-api/infrastructure.rst
new file mode 100644
index 0000000000..3d52dfdfa9
--- /dev/null
+++ b/Documentation/driver-api/infrastructure.rst
@@ -0,0 +1,97 @@
+Device drivers infrastructure
+=============================
+
+The Basic Device Driver-Model Structures
+----------------------------------------
+
+.. kernel-doc:: include/linux/device.h
+ :internal:
+ :no-identifiers: device_link_state
+
+.. kernel-doc:: include/linux/device/bus.h
+ :identifiers: bus_type bus_notifier_event
+
+.. kernel-doc:: include/linux/device/class.h
+ :identifiers: class
+
+.. kernel-doc:: include/linux/device/driver.h
+ :identifiers: probe_type device_driver
+
+Device Drivers Base
+-------------------
+
+.. kernel-doc:: drivers/base/init.c
+ :internal:
+
+.. kernel-doc:: include/linux/device/driver.h
+ :no-identifiers: probe_type device_driver
+
+.. kernel-doc:: drivers/base/driver.c
+ :export:
+
+.. kernel-doc:: drivers/base/core.c
+ :export:
+
+.. kernel-doc:: drivers/base/syscore.c
+ :export:
+
+.. kernel-doc:: include/linux/device/class.h
+ :no-identifiers: class
+
+.. kernel-doc:: drivers/base/class.c
+ :export:
+
+.. kernel-doc:: drivers/base/node.c
+ :internal:
+
+.. kernel-doc:: drivers/base/transport_class.c
+ :export:
+
+.. kernel-doc:: drivers/base/dd.c
+ :export:
+
+.. kernel-doc:: include/linux/platform_device.h
+ :internal:
+
+.. kernel-doc:: drivers/base/platform.c
+ :export:
+
+.. kernel-doc:: include/linux/device/bus.h
+ :no-identifiers: bus_type bus_notifier_event
+
+.. kernel-doc:: drivers/base/bus.c
+ :export:
+
+Device Drivers DMA Management
+-----------------------------
+
+.. kernel-doc:: kernel/dma/mapping.c
+ :export:
+
+Device drivers PnP support
+--------------------------
+
+.. kernel-doc:: drivers/pnp/core.c
+ :internal:
+
+.. kernel-doc:: drivers/pnp/card.c
+ :export:
+
+.. kernel-doc:: drivers/pnp/driver.c
+ :internal:
+
+.. kernel-doc:: drivers/pnp/manager.c
+ :export:
+
+.. kernel-doc:: drivers/pnp/support.c
+ :export:
+
+Userspace IO devices
+--------------------
+
+.. kernel-doc:: drivers/uio/uio.c
+ :export:
+
+.. kernel-doc:: include/linux/uio_driver.h
+ :internal:
+
diff --git a/Documentation/driver-api/input.rst b/Documentation/driver-api/input.rst
new file mode 100644
index 0000000000..4bbb26ae2a
--- /dev/null
+++ b/Documentation/driver-api/input.rst
@@ -0,0 +1,42 @@
+Input Subsystem
+===============
+
+Input core
+----------
+
+.. kernel-doc:: include/linux/input.h
+ :internal:
+
+.. kernel-doc:: drivers/input/input.c
+ :export:
+
+.. kernel-doc:: drivers/input/ff-core.c
+ :export:
+
+.. kernel-doc:: drivers/input/ff-memless.c
+ :export:
+
+Multitouch Library
+------------------
+
+.. kernel-doc:: include/linux/input/mt.h
+ :internal:
+
+.. kernel-doc:: drivers/input/input-mt.c
+ :export:
+
+Matrix keyboards/keypads
+------------------------
+
+.. kernel-doc:: include/linux/input/matrix_keypad.h
+ :internal:
+
+Sparse keymap support
+---------------------
+
+.. kernel-doc:: include/linux/input/sparse-keymap.h
+ :internal:
+
+.. kernel-doc:: drivers/input/sparse-keymap.c
+ :export:
+
diff --git a/Documentation/driver-api/interconnect.rst b/Documentation/driver-api/interconnect.rst
new file mode 100644
index 0000000000..a92d0f277a
--- /dev/null
+++ b/Documentation/driver-api/interconnect.rst
@@ -0,0 +1,140 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=====================================
+Generic System Interconnect Subsystem
+=====================================
+
+Introduction
+------------
+
+This framework is designed to provide a standard kernel interface to control
+the settings of the interconnects on an SoC. These settings can be throughput,
+latency and priority between multiple interconnected devices or functional
+blocks. This can be controlled dynamically in order to save power or provide
+maximum performance.
+
+The interconnect bus is hardware with configurable parameters, which can be
+set on a data path according to the requests received from various drivers.
+An example of interconnect buses are the interconnects between various
+components or functional blocks in chipsets. There can be multiple interconnects
+on an SoC that can be multi-tiered.
+
+Below is a simplified diagram of a real-world SoC interconnect bus topology.
+
+::
+
+ +----------------+ +----------------+
+ | HW Accelerator |--->| M NoC |<---------------+
+ +----------------+ +----------------+ |
+ | | +------------+
+ +-----+ +-------------+ V +------+ | |
+ | DDR | | +--------+ | PCIe | | |
+ +-----+ | | Slaves | +------+ | |
+ ^ ^ | +--------+ | | C NoC |
+ | | V V | |
+ +------------------+ +------------------------+ | | +-----+
+ | |-->| |-->| |-->| CPU |
+ | |-->| |<--| | +-----+
+ | Mem NoC | | S NoC | +------------+
+ | |<--| |---------+ |
+ | |<--| |<------+ | | +--------+
+ +------------------+ +------------------------+ | | +-->| Slaves |
+ ^ ^ ^ ^ ^ | | +--------+
+ | | | | | | V
+ +------+ | +-----+ +-----+ +---------+ +----------------+ +--------+
+ | CPUs | | | GPU | | DSP | | Masters |-->| P NoC |-->| Slaves |
+ +------+ | +-----+ +-----+ +---------+ +----------------+ +--------+
+ |
+ +-------+
+ | Modem |
+ +-------+
+
+Terminology
+-----------
+
+Interconnect provider is the software definition of the interconnect hardware.
+The interconnect providers on the above diagram are M NoC, S NoC, C NoC, P NoC
+and Mem NoC.
+
+Interconnect node is the software definition of the interconnect hardware
+port. Each interconnect provider consists of multiple interconnect nodes,
+which are connected to other SoC components including other interconnect
+providers. The point on the diagram where the CPUs connect to the memory is
+called an interconnect node, which belongs to the Mem NoC interconnect provider.
+
+Interconnect endpoints are the first or the last element of the path. Every
+endpoint is a node, but not every node is an endpoint.
+
+Interconnect path is everything between two endpoints including all the nodes
+that have to be traversed to reach from a source to destination node. It may
+include multiple master-slave pairs across several interconnect providers.
+
+Interconnect consumers are the entities which make use of the data paths exposed
+by the providers. The consumers send requests to providers requesting various
+throughput, latency and priority. Usually the consumers are device drivers, that
+send request based on their needs. An example for a consumer is a video decoder
+that supports various formats and image sizes.
+
+Interconnect providers
+----------------------
+
+Interconnect provider is an entity that implements methods to initialize and
+configure interconnect bus hardware. The interconnect provider drivers should
+be registered with the interconnect provider core.
+
+.. kernel-doc:: include/linux/interconnect-provider.h
+
+Interconnect consumers
+----------------------
+
+Interconnect consumers are the clients which use the interconnect APIs to
+get paths between endpoints and set their bandwidth/latency/QoS requirements
+for these interconnect paths. These interfaces are not currently
+documented.
+
+Interconnect debugfs interfaces
+-------------------------------
+
+Like several other subsystems interconnect will create some files for debugging
+and introspection. Files in debugfs are not considered ABI so application
+software shouldn't rely on format details change between kernel versions.
+
+``/sys/kernel/debug/interconnect/interconnect_summary``:
+
+Show all interconnect nodes in the system with their aggregated bandwidth
+request. Indented under each node show bandwidth requests from each device.
+
+``/sys/kernel/debug/interconnect/interconnect_graph``:
+
+Show the interconnect graph in the graphviz dot format. It shows all
+interconnect nodes and links in the system and groups together nodes from the
+same provider as subgraphs. The format is human-readable and can also be piped
+through dot to generate diagrams in many graphical formats::
+
+ $ cat /sys/kernel/debug/interconnect/interconnect_graph | \
+ dot -Tsvg > interconnect_graph.svg
+
+The ``test-client`` directory provides interfaces for issuing BW requests to
+any arbitrary path. Note that for safety reasons, this feature is disabled by
+default without a Kconfig to enable it. Enabling it requires code changes to
+``#define INTERCONNECT_ALLOW_WRITE_DEBUGFS``. Example usage::
+
+ cd /sys/kernel/debug/interconnect/test-client/
+
+ # Configure node endpoints for the path from CPU to DDR on
+ # qcom/sm8550.
+ echo chm_apps > src_node
+ echo ebi > dst_node
+
+ # Get path between src_node and dst_node. This is only
+ # necessary after updating the node endpoints.
+ echo 1 > get
+
+ # Set desired BW to 1GBps avg and 2GBps peak.
+ echo 1000000 > avg_bw
+ echo 2000000 > peak_bw
+
+ # Vote for avg_bw and peak_bw on the latest path from "get".
+ # Voting for multiple paths is possible by repeating this
+ # process for different nodes endpoints.
+ echo 1 > commit
diff --git a/Documentation/driver-api/io-mapping.rst b/Documentation/driver-api/io-mapping.rst
new file mode 100644
index 0000000000..7274204b04
--- /dev/null
+++ b/Documentation/driver-api/io-mapping.rst
@@ -0,0 +1,91 @@
+========================
+The io_mapping functions
+========================
+
+API
+===
+
+The io_mapping functions in linux/io-mapping.h provide an abstraction for
+efficiently mapping small regions of an I/O device to the CPU. The initial
+usage is to support the large graphics aperture on 32-bit processors where
+ioremap_wc cannot be used to statically map the entire aperture to the CPU
+as it would consume too much of the kernel address space.
+
+A mapping object is created during driver initialization using::
+
+ struct io_mapping *io_mapping_create_wc(unsigned long base,
+ unsigned long size)
+
+'base' is the bus address of the region to be made
+mappable, while 'size' indicates how large a mapping region to
+enable. Both are in bytes.
+
+This _wc variant provides a mapping which may only be used with
+io_mapping_map_atomic_wc(), io_mapping_map_local_wc() or
+io_mapping_map_wc().
+
+With this mapping object, individual pages can be mapped either temporarily
+or long term, depending on the requirements. Of course, temporary maps are
+more efficient. They come in two flavours::
+
+ void *io_mapping_map_local_wc(struct io_mapping *mapping,
+ unsigned long offset)
+
+ void *io_mapping_map_atomic_wc(struct io_mapping *mapping,
+ unsigned long offset)
+
+'offset' is the offset within the defined mapping region. Accessing
+addresses beyond the region specified in the creation function yields
+undefined results. Using an offset which is not page aligned yields an
+undefined result. The return value points to a single page in CPU address
+space.
+
+This _wc variant returns a write-combining map to the page and may only be
+used with mappings created by io_mapping_create_wc()
+
+Temporary mappings are only valid in the context of the caller. The mapping
+is not guaranteed to be globally visible.
+
+io_mapping_map_local_wc() has a side effect on X86 32bit as it disables
+migration to make the mapping code work. No caller can rely on this side
+effect.
+
+io_mapping_map_atomic_wc() has the side effect of disabling preemption and
+pagefaults. Don't use in new code. Use io_mapping_map_local_wc() instead.
+
+Nested mappings need to be undone in reverse order because the mapping
+code uses a stack for keeping track of them::
+
+ addr1 = io_mapping_map_local_wc(map1, offset1);
+ addr2 = io_mapping_map_local_wc(map2, offset2);
+ ...
+ io_mapping_unmap_local(addr2);
+ io_mapping_unmap_local(addr1);
+
+The mappings are released with::
+
+ void io_mapping_unmap_local(void *vaddr)
+ void io_mapping_unmap_atomic(void *vaddr)
+
+'vaddr' must be the value returned by the last io_mapping_map_local_wc() or
+io_mapping_map_atomic_wc() call. This unmaps the specified mapping and
+undoes the side effects of the mapping functions.
+
+If you need to sleep while holding a mapping, you can use the regular
+variant, although this may be significantly slower::
+
+ void *io_mapping_map_wc(struct io_mapping *mapping,
+ unsigned long offset)
+
+This works like io_mapping_map_atomic/local_wc() except it has no side
+effects and the pointer is globally visible.
+
+The mappings are released with::
+
+ void io_mapping_unmap(void *vaddr)
+
+Use for pages mapped with io_mapping_map_wc().
+
+At driver close time, the io_mapping object must be freed::
+
+ void io_mapping_free(struct io_mapping *mapping)
diff --git a/Documentation/driver-api/io_ordering.rst b/Documentation/driver-api/io_ordering.rst
new file mode 100644
index 0000000000..2ab303ce9a
--- /dev/null
+++ b/Documentation/driver-api/io_ordering.rst
@@ -0,0 +1,51 @@
+==============================================
+Ordering I/O writes to memory-mapped addresses
+==============================================
+
+On some platforms, so-called memory-mapped I/O is weakly ordered. On such
+platforms, driver writers are responsible for ensuring that I/O writes to
+memory-mapped addresses on their device arrive in the order intended. This is
+typically done by reading a 'safe' device or bridge register, causing the I/O
+chipset to flush pending writes to the device before any reads are posted. A
+driver would usually use this technique immediately prior to the exit of a
+critical section of code protected by spinlocks. This would ensure that
+subsequent writes to I/O space arrived only after all prior writes (much like a
+memory barrier op, mb(), only with respect to I/O).
+
+A more concrete example from a hypothetical device driver::
+
+ ...
+ CPU A: spin_lock_irqsave(&dev_lock, flags)
+ CPU A: val = readl(my_status);
+ CPU A: ...
+ CPU A: writel(newval, ring_ptr);
+ CPU A: spin_unlock_irqrestore(&dev_lock, flags)
+ ...
+ CPU B: spin_lock_irqsave(&dev_lock, flags)
+ CPU B: val = readl(my_status);
+ CPU B: ...
+ CPU B: writel(newval2, ring_ptr);
+ CPU B: spin_unlock_irqrestore(&dev_lock, flags)
+ ...
+
+In the case above, the device may receive newval2 before it receives newval,
+which could cause problems. Fixing it is easy enough though::
+
+ ...
+ CPU A: spin_lock_irqsave(&dev_lock, flags)
+ CPU A: val = readl(my_status);
+ CPU A: ...
+ CPU A: writel(newval, ring_ptr);
+ CPU A: (void)readl(safe_register); /* maybe a config register? */
+ CPU A: spin_unlock_irqrestore(&dev_lock, flags)
+ ...
+ CPU B: spin_lock_irqsave(&dev_lock, flags)
+ CPU B: val = readl(my_status);
+ CPU B: ...
+ CPU B: writel(newval2, ring_ptr);
+ CPU B: (void)readl(safe_register); /* maybe a config register? */
+ CPU B: spin_unlock_irqrestore(&dev_lock, flags)
+
+Here, the reads from safe_register will cause the I/O chipset to flush any
+pending writes before actually posting the read to the chipset, preventing
+possible data corruption.
diff --git a/Documentation/driver-api/ioctl.rst b/Documentation/driver-api/ioctl.rst
new file mode 100644
index 0000000000..35795f6a15
--- /dev/null
+++ b/Documentation/driver-api/ioctl.rst
@@ -0,0 +1,253 @@
+======================
+ioctl based interfaces
+======================
+
+ioctl() is the most common way for applications to interface
+with device drivers. It is flexible and easily extended by adding new
+commands and can be passed through character devices, block devices as
+well as sockets and other special file descriptors.
+
+However, it is also very easy to get ioctl command definitions wrong,
+and hard to fix them later without breaking existing applications,
+so this documentation tries to help developers get it right.
+
+Command number definitions
+==========================
+
+The command number, or request number, is the second argument passed to
+the ioctl system call. While this can be any 32-bit number that uniquely
+identifies an action for a particular driver, there are a number of
+conventions around defining them.
+
+``include/uapi/asm-generic/ioctl.h`` provides four macros for defining
+ioctl commands that follow modern conventions: ``_IO``, ``_IOR``,
+``_IOW``, and ``_IOWR``. These should be used for all new commands,
+with the correct parameters:
+
+_IO/_IOR/_IOW/_IOWR
+ The macro name specifies how the argument will be used. It may be a
+ pointer to data to be passed into the kernel (_IOW), out of the kernel
+ (_IOR), or both (_IOWR). _IO can indicate either commands with no
+ argument or those passing an integer value instead of a pointer.
+ It is recommended to only use _IO for commands without arguments,
+ and use pointers for passing data.
+
+type
+ An 8-bit number, often a character literal, specific to a subsystem
+ or driver, and listed in Documentation/userspace-api/ioctl/ioctl-number.rst
+
+nr
+ An 8-bit number identifying the specific command, unique for a give
+ value of 'type'
+
+data_type
+ The name of the data type pointed to by the argument, the command number
+ encodes the ``sizeof(data_type)`` value in a 13-bit or 14-bit integer,
+ leading to a limit of 8191 bytes for the maximum size of the argument.
+ Note: do not pass sizeof(data_type) type into _IOR/_IOW/IOWR, as that
+ will lead to encoding sizeof(sizeof(data_type)), i.e. sizeof(size_t).
+ _IO does not have a data_type parameter.
+
+
+Interface versions
+==================
+
+Some subsystems use version numbers in data structures to overload
+commands with different interpretations of the argument.
+
+This is generally a bad idea, since changes to existing commands tend
+to break existing applications.
+
+A better approach is to add a new ioctl command with a new number. The
+old command still needs to be implemented in the kernel for compatibility,
+but this can be a wrapper around the new implementation.
+
+Return code
+===========
+
+ioctl commands can return negative error codes as documented in errno(3);
+these get turned into errno values in user space. On success, the return
+code should be zero. It is also possible but not recommended to return
+a positive 'long' value.
+
+When the ioctl callback is called with an unknown command number, the
+handler returns either -ENOTTY or -ENOIOCTLCMD, which also results in
+-ENOTTY being returned from the system call. Some subsystems return
+-ENOSYS or -EINVAL here for historic reasons, but this is wrong.
+
+Prior to Linux 5.5, compat_ioctl handlers were required to return
+-ENOIOCTLCMD in order to use the fallback conversion into native
+commands. As all subsystems are now responsible for handling compat
+mode themselves, this is no longer needed, but it may be important to
+consider when backporting bug fixes to older kernels.
+
+Timestamps
+==========
+
+Traditionally, timestamps and timeout values are passed as ``struct
+timespec`` or ``struct timeval``, but these are problematic because of
+incompatible definitions of these structures in user space after the
+move to 64-bit time_t.
+
+The ``struct __kernel_timespec`` type can be used instead to be embedded
+in other data structures when separate second/nanosecond values are
+desired, or passed to user space directly. This is still not ideal though,
+as the structure matches neither the kernel's timespec64 nor the user
+space timespec exactly. The get_timespec64() and put_timespec64() helper
+functions can be used to ensure that the layout remains compatible with
+user space and the padding is treated correctly.
+
+As it is cheap to convert seconds to nanoseconds, but the opposite
+requires an expensive 64-bit division, a simple __u64 nanosecond value
+can be simpler and more efficient.
+
+Timeout values and timestamps should ideally use CLOCK_MONOTONIC time,
+as returned by ktime_get_ns() or ktime_get_ts64(). Unlike
+CLOCK_REALTIME, this makes the timestamps immune from jumping backwards
+or forwards due to leap second adjustments and clock_settime() calls.
+
+ktime_get_real_ns() can be used for CLOCK_REALTIME timestamps that
+need to be persistent across a reboot or between multiple machines.
+
+32-bit compat mode
+==================
+
+In order to support 32-bit user space running on a 64-bit machine, each
+subsystem or driver that implements an ioctl callback handler must also
+implement the corresponding compat_ioctl handler.
+
+As long as all the rules for data structures are followed, this is as
+easy as setting the .compat_ioctl pointer to a helper function such as
+compat_ptr_ioctl() or blkdev_compat_ptr_ioctl().
+
+compat_ptr()
+------------
+
+On the s390 architecture, 31-bit user space has ambiguous representations
+for data pointers, with the upper bit being ignored. When running such
+a process in compat mode, the compat_ptr() helper must be used to
+clear the upper bit of a compat_uptr_t and turn it into a valid 64-bit
+pointer. On other architectures, this macro only performs a cast to a
+``void __user *`` pointer.
+
+In an compat_ioctl() callback, the last argument is an unsigned long,
+which can be interpreted as either a pointer or a scalar depending on
+the command. If it is a scalar, then compat_ptr() must not be used, to
+ensure that the 64-bit kernel behaves the same way as a 32-bit kernel
+for arguments with the upper bit set.
+
+The compat_ptr_ioctl() helper can be used in place of a custom
+compat_ioctl file operation for drivers that only take arguments that
+are pointers to compatible data structures.
+
+Structure layout
+----------------
+
+Compatible data structures have the same layout on all architectures,
+avoiding all problematic members:
+
+* ``long`` and ``unsigned long`` are the size of a register, so
+ they can be either 32-bit or 64-bit wide and cannot be used in portable
+ data structures. Fixed-length replacements are ``__s32``, ``__u32``,
+ ``__s64`` and ``__u64``.
+
+* Pointers have the same problem, in addition to requiring the
+ use of compat_ptr(). The best workaround is to use ``__u64``
+ in place of pointers, which requires a cast to ``uintptr_t`` in user
+ space, and the use of u64_to_user_ptr() in the kernel to convert
+ it back into a user pointer.
+
+* On the x86-32 (i386) architecture, the alignment of 64-bit variables
+ is only 32-bit, but they are naturally aligned on most other
+ architectures including x86-64. This means a structure like::
+
+ struct foo {
+ __u32 a;
+ __u64 b;
+ __u32 c;
+ };
+
+ has four bytes of padding between a and b on x86-64, plus another four
+ bytes of padding at the end, but no padding on i386, and it needs a
+ compat_ioctl conversion handler to translate between the two formats.
+
+ To avoid this problem, all structures should have their members
+ naturally aligned, or explicit reserved fields added in place of the
+ implicit padding. The ``pahole`` tool can be used for checking the
+ alignment.
+
+* On ARM OABI user space, structures are padded to multiples of 32-bit,
+ making some structs incompatible with modern EABI kernels if they
+ do not end on a 32-bit boundary.
+
+* On the m68k architecture, struct members are not guaranteed to have an
+ alignment greater than 16-bit, which is a problem when relying on
+ implicit padding.
+
+* Bitfields and enums generally work as one would expect them to,
+ but some properties of them are implementation-defined, so it is better
+ to avoid them completely in ioctl interfaces.
+
+* ``char`` members can be either signed or unsigned, depending on
+ the architecture, so the __u8 and __s8 types should be used for 8-bit
+ integer values, though char arrays are clearer for fixed-length strings.
+
+Information leaks
+=================
+
+Uninitialized data must not be copied back to user space, as this can
+cause an information leak, which can be used to defeat kernel address
+space layout randomization (KASLR), helping in an attack.
+
+For this reason (and for compat support) it is best to avoid any
+implicit padding in data structures. Where there is implicit padding
+in an existing structure, kernel drivers must be careful to fully
+initialize an instance of the structure before copying it to user
+space. This is usually done by calling memset() before assigning to
+individual members.
+
+Subsystem abstractions
+======================
+
+While some device drivers implement their own ioctl function, most
+subsystems implement the same command for multiple drivers. Ideally the
+subsystem has an .ioctl() handler that copies the arguments from and
+to user space, passing them into subsystem specific callback functions
+through normal kernel pointers.
+
+This helps in various ways:
+
+* Applications written for one driver are more likely to work for
+ another one in the same subsystem if there are no subtle differences
+ in the user space ABI.
+
+* The complexity of user space access and data structure layout is done
+ in one place, reducing the potential for implementation bugs.
+
+* It is more likely to be reviewed by experienced developers
+ that can spot problems in the interface when the ioctl is shared
+ between multiple drivers than when it is only used in a single driver.
+
+Alternatives to ioctl
+=====================
+
+There are many cases in which ioctl is not the best solution for a
+problem. Alternatives include:
+
+* System calls are a better choice for a system-wide feature that
+ is not tied to a physical device or constrained by the file system
+ permissions of a character device node
+
+* netlink is the preferred way of configuring any network related
+ objects through sockets.
+
+* debugfs is used for ad-hoc interfaces for debugging functionality
+ that does not need to be exposed as a stable interface to applications.
+
+* sysfs is a good way to expose the state of an in-kernel object
+ that is not tied to a file descriptor.
+
+* configfs can be used for more complex configuration than sysfs
+
+* A custom file system can provide extra flexibility with a simple
+ user interface but adds a lot of complexity to the implementation.
diff --git a/Documentation/driver-api/ipmb.rst b/Documentation/driver-api/ipmb.rst
new file mode 100644
index 0000000000..209c49e051
--- /dev/null
+++ b/Documentation/driver-api/ipmb.rst
@@ -0,0 +1,109 @@
+==============================
+IPMB Driver for a Satellite MC
+==============================
+
+The Intelligent Platform Management Bus or IPMB, is an
+I2C bus that provides a standardized interconnection between
+different boards within a chassis. This interconnection is
+between the baseboard management (BMC) and chassis electronics.
+IPMB is also associated with the messaging protocol through the
+IPMB bus.
+
+The devices using the IPMB are usually management
+controllers that perform management functions such as servicing
+the front panel interface, monitoring the baseboard,
+hot-swapping disk drivers in the system chassis, etc...
+
+When an IPMB is implemented in the system, the BMC serves as
+a controller to give system software access to the IPMB. The BMC
+sends IPMI requests to a device (usually a Satellite Management
+Controller or Satellite MC) via IPMB and the device
+sends a response back to the BMC.
+
+For more information on IPMB and the format of an IPMB message,
+refer to the IPMB and IPMI specifications.
+
+IPMB driver for Satellite MC
+----------------------------
+
+ipmb-dev-int - This is the driver needed on a Satellite MC to
+receive IPMB messages from a BMC and send a response back.
+This driver works with the I2C driver and a userspace
+program such as OpenIPMI:
+
+1) It is an I2C slave backend driver. So, it defines a callback
+ function to set the Satellite MC as an I2C slave.
+ This callback function handles the received IPMI requests.
+
+2) It defines the read and write functions to enable a user
+ space program (such as OpenIPMI) to communicate with the kernel.
+
+
+Load the IPMB driver
+--------------------
+
+The driver needs to be loaded at boot time or manually first.
+First, make sure you have the following in your config file:
+CONFIG_IPMB_DEVICE_INTERFACE=y
+
+1) If you want the driver to be loaded at boot time:
+
+a) Add this entry to your ACPI table, under the appropriate SMBus::
+
+ Device (SMB0) // Example SMBus host controller
+ {
+ Name (_HID, "<Vendor-Specific HID>") // Vendor-Specific HID
+ Name (_UID, 0) // Unique ID of particular host controller
+ :
+ :
+ Device (IPMB)
+ {
+ Name (_HID, "IPMB0001") // IPMB device interface
+ Name (_UID, 0) // Unique device identifier
+ }
+ }
+
+b) Example for device tree::
+
+ &i2c2 {
+ status = "okay";
+
+ ipmb@10 {
+ compatible = "ipmb-dev";
+ reg = <0x10>;
+ i2c-protocol;
+ };
+ };
+
+If xmit of data to be done using raw i2c block vs smbus
+then "i2c-protocol" needs to be defined as above.
+
+2) Manually from Linux::
+
+ modprobe ipmb-dev-int
+
+
+Instantiate the device
+----------------------
+
+After loading the driver, you can instantiate the device as
+described in 'Documentation/i2c/instantiating-devices.rst'.
+If you have multiple BMCs, each connected to your Satellite MC via
+a different I2C bus, you can instantiate a device for each of
+those BMCs.
+
+The name of the instantiated device contains the I2C bus number
+associated with it as follows::
+
+ BMC1 ------ IPMB/I2C bus 1 ---------| /dev/ipmb-1
+ Satellite MC
+ BMC1 ------ IPMB/I2C bus 2 ---------| /dev/ipmb-2
+
+For instance, you can instantiate the ipmb-dev-int device from
+user space at the 7 bit address 0x10 on bus 2::
+
+ # echo ipmb-dev 0x1010 > /sys/bus/i2c/devices/i2c-2/new_device
+
+This will create the device file /dev/ipmb-2, which can be accessed
+by the user space program. The device needs to be instantiated
+before running the user space program.
diff --git a/Documentation/driver-api/ipmi.rst b/Documentation/driver-api/ipmi.rst
new file mode 100644
index 0000000000..e224e47b6b
--- /dev/null
+++ b/Documentation/driver-api/ipmi.rst
@@ -0,0 +1,810 @@
+=====================
+The Linux IPMI Driver
+=====================
+
+:Author: Corey Minyard <minyard@mvista.com> / <minyard@acm.org>
+
+The Intelligent Platform Management Interface, or IPMI, is a
+standard for controlling intelligent devices that monitor a system.
+It provides for dynamic discovery of sensors in the system and the
+ability to monitor the sensors and be informed when the sensor's
+values change or go outside certain boundaries. It also has a
+standardized database for field-replaceable units (FRUs) and a watchdog
+timer.
+
+To use this, you need an interface to an IPMI controller in your
+system (called a Baseboard Management Controller, or BMC) and
+management software that can use the IPMI system.
+
+This document describes how to use the IPMI driver for Linux. If you
+are not familiar with IPMI itself, see the web site at
+https://www.intel.com/design/servers/ipmi/index.htm. IPMI is a big
+subject and I can't cover it all here!
+
+Configuration
+-------------
+
+The Linux IPMI driver is modular, which means you have to pick several
+things to have it work right depending on your hardware. Most of
+these are available in the 'Character Devices' menu then the IPMI
+menu.
+
+No matter what, you must pick 'IPMI top-level message handler' to use
+IPMI. What you do beyond that depends on your needs and hardware.
+
+The message handler does not provide any user-level interfaces.
+Kernel code (like the watchdog) can still use it. If you need access
+from userland, you need to select 'Device interface for IPMI' if you
+want access through a device driver.
+
+The driver interface depends on your hardware. If your system
+properly provides the SMBIOS info for IPMI, the driver will detect it
+and just work. If you have a board with a standard interface (These
+will generally be either "KCS", "SMIC", or "BT", consult your hardware
+manual), choose the 'IPMI SI handler' option. A driver also exists
+for direct I2C access to the IPMI management controller. Some boards
+support this, but it is unknown if it will work on every board. For
+this, choose 'IPMI SMBus handler', but be ready to try to do some
+figuring to see if it will work on your system if the SMBIOS/APCI
+information is wrong or not present. It is fairly safe to have both
+these enabled and let the drivers auto-detect what is present.
+
+You should generally enable ACPI on your system, as systems with IPMI
+can have ACPI tables describing them.
+
+If you have a standard interface and the board manufacturer has done
+their job correctly, the IPMI controller should be automatically
+detected (via ACPI or SMBIOS tables) and should just work. Sadly,
+many boards do not have this information. The driver attempts
+standard defaults, but they may not work. If you fall into this
+situation, you need to read the section below named 'The SI Driver' or
+"The SMBus Driver" on how to hand-configure your system.
+
+IPMI defines a standard watchdog timer. You can enable this with the
+'IPMI Watchdog Timer' config option. If you compile the driver into
+the kernel, then via a kernel command-line option you can have the
+watchdog timer start as soon as it initializes. It also have a lot
+of other options, see the 'Watchdog' section below for more details.
+Note that you can also have the watchdog continue to run if it is
+closed (by default it is disabled on close). Go into the 'Watchdog
+Cards' menu, enable 'Watchdog Timer Support', and enable the option
+'Disable watchdog shutdown on close'.
+
+IPMI systems can often be powered off using IPMI commands. Select
+'IPMI Poweroff' to do this. The driver will auto-detect if the system
+can be powered off by IPMI. It is safe to enable this even if your
+system doesn't support this option. This works on ATCA systems, the
+Radisys CPI1 card, and any IPMI system that supports standard chassis
+management commands.
+
+If you want the driver to put an event into the event log on a panic,
+enable the 'Generate a panic event to all BMCs on a panic' option. If
+you want the whole panic string put into the event log using OEM
+events, enable the 'Generate OEM events containing the panic string'
+option. You can also enable these dynamically by setting the module
+parameter named "panic_op" in the ipmi_msghandler module to "event"
+or "string". Setting that parameter to "none" disables this function.
+
+Basic Design
+------------
+
+The Linux IPMI driver is designed to be very modular and flexible, you
+only need to take the pieces you need and you can use it in many
+different ways. Because of that, it's broken into many chunks of
+code. These chunks (by module name) are:
+
+ipmi_msghandler - This is the central piece of software for the IPMI
+system. It handles all messages, message timing, and responses. The
+IPMI users tie into this, and the IPMI physical interfaces (called
+System Management Interfaces, or SMIs) also tie in here. This
+provides the kernelland interface for IPMI, but does not provide an
+interface for use by application processes.
+
+ipmi_devintf - This provides a userland IOCTL interface for the IPMI
+driver, each open file for this device ties in to the message handler
+as an IPMI user.
+
+ipmi_si - A driver for various system interfaces. This supports KCS,
+SMIC, and BT interfaces. Unless you have an SMBus interface or your
+own custom interface, you probably need to use this.
+
+ipmi_ssif - A driver for accessing BMCs on the SMBus. It uses the
+I2C kernel driver's SMBus interfaces to send and receive IPMI messages
+over the SMBus.
+
+ipmi_powernv - A driver for access BMCs on POWERNV systems.
+
+ipmi_watchdog - IPMI requires systems to have a very capable watchdog
+timer. This driver implements the standard Linux watchdog timer
+interface on top of the IPMI message handler.
+
+ipmi_poweroff - Some systems support the ability to be turned off via
+IPMI commands.
+
+bt-bmc - This is not part of the main driver, but instead a driver for
+accessing a BMC-side interface of a BT interface. It is used on BMCs
+running Linux to provide an interface to the host.
+
+These are all individually selectable via configuration options.
+
+Much documentation for the interface is in the include files. The
+IPMI include files are:
+
+linux/ipmi.h - Contains the user interface and IOCTL interface for IPMI.
+
+linux/ipmi_smi.h - Contains the interface for system management interfaces
+(things that interface to IPMI controllers) to use.
+
+linux/ipmi_msgdefs.h - General definitions for base IPMI messaging.
+
+
+Addressing
+----------
+
+The IPMI addressing works much like IP addresses, you have an overlay
+to handle the different address types. The overlay is::
+
+ struct ipmi_addr
+ {
+ int addr_type;
+ short channel;
+ char data[IPMI_MAX_ADDR_SIZE];
+ };
+
+The addr_type determines what the address really is. The driver
+currently understands two different types of addresses.
+
+"System Interface" addresses are defined as::
+
+ struct ipmi_system_interface_addr
+ {
+ int addr_type;
+ short channel;
+ };
+
+and the type is IPMI_SYSTEM_INTERFACE_ADDR_TYPE. This is used for talking
+straight to the BMC on the current card. The channel must be
+IPMI_BMC_CHANNEL.
+
+Messages that are destined to go out on the IPMB bus going through the
+BMC use the IPMI_IPMB_ADDR_TYPE address type. The format is::
+
+ struct ipmi_ipmb_addr
+ {
+ int addr_type;
+ short channel;
+ unsigned char slave_addr;
+ unsigned char lun;
+ };
+
+The "channel" here is generally zero, but some devices support more
+than one channel, it corresponds to the channel as defined in the IPMI
+spec.
+
+There is also an IPMB direct address for a situation where the sender
+is directly on an IPMB bus and doesn't have to go through the BMC.
+You can send messages to a specific management controller (MC) on the
+IPMB using the IPMI_IPMB_DIRECT_ADDR_TYPE with the following format::
+
+ struct ipmi_ipmb_direct_addr
+ {
+ int addr_type;
+ short channel;
+ unsigned char slave_addr;
+ unsigned char rq_lun;
+ unsigned char rs_lun;
+ };
+
+The channel is always zero. You can also receive commands from other
+MCs that you have registered to handle and respond to them, so you can
+use this to implement a management controller on a bus..
+
+Messages
+--------
+
+Messages are defined as::
+
+ struct ipmi_msg
+ {
+ unsigned char netfn;
+ unsigned char lun;
+ unsigned char cmd;
+ unsigned char *data;
+ int data_len;
+ };
+
+The driver takes care of adding/stripping the header information. The
+data portion is just the data to be send (do NOT put addressing info
+here) or the response. Note that the completion code of a response is
+the first item in "data", it is not stripped out because that is how
+all the messages are defined in the spec (and thus makes counting the
+offsets a little easier :-).
+
+When using the IOCTL interface from userland, you must provide a block
+of data for "data", fill it, and set data_len to the length of the
+block of data, even when receiving messages. Otherwise the driver
+will have no place to put the message.
+
+Messages coming up from the message handler in kernelland will come in
+as::
+
+ struct ipmi_recv_msg
+ {
+ struct list_head link;
+
+ /* The type of message as defined in the "Receive Types"
+ defines above. */
+ int recv_type;
+
+ ipmi_user_t *user;
+ struct ipmi_addr addr;
+ long msgid;
+ struct ipmi_msg msg;
+
+ /* Call this when done with the message. It will presumably free
+ the message and do any other necessary cleanup. */
+ void (*done)(struct ipmi_recv_msg *msg);
+
+ /* Place-holder for the data, don't make any assumptions about
+ the size or existence of this, since it may change. */
+ unsigned char msg_data[IPMI_MAX_MSG_LENGTH];
+ };
+
+You should look at the receive type and handle the message
+appropriately.
+
+
+The Upper Layer Interface (Message Handler)
+-------------------------------------------
+
+The upper layer of the interface provides the users with a consistent
+view of the IPMI interfaces. It allows multiple SMI interfaces to be
+addressed (because some boards actually have multiple BMCs on them)
+and the user should not have to care what type of SMI is below them.
+
+
+Watching For Interfaces
+^^^^^^^^^^^^^^^^^^^^^^^
+
+When your code comes up, the IPMI driver may or may not have detected
+if IPMI devices exist. So you might have to defer your setup until
+the device is detected, or you might be able to do it immediately.
+To handle this, and to allow for discovery, you register an SMI
+watcher with ipmi_smi_watcher_register() to iterate over interfaces
+and tell you when they come and go.
+
+
+Creating the User
+^^^^^^^^^^^^^^^^^
+
+To use the message handler, you must first create a user using
+ipmi_create_user. The interface number specifies which SMI you want
+to connect to, and you must supply callback functions to be called
+when data comes in. The callback function can run at interrupt level,
+so be careful using the callbacks. This also allows to you pass in a
+piece of data, the handler_data, that will be passed back to you on
+all calls.
+
+Once you are done, call ipmi_destroy_user() to get rid of the user.
+
+From userland, opening the device automatically creates a user, and
+closing the device automatically destroys the user.
+
+
+Messaging
+^^^^^^^^^
+
+To send a message from kernel-land, the ipmi_request_settime() call does
+pretty much all message handling. Most of the parameter are
+self-explanatory. However, it takes a "msgid" parameter. This is NOT
+the sequence number of messages. It is simply a long value that is
+passed back when the response for the message is returned. You may
+use it for anything you like.
+
+Responses come back in the function pointed to by the ipmi_recv_hndl
+field of the "handler" that you passed in to ipmi_create_user().
+Remember again, these may be running at interrupt level. Remember to
+look at the receive type, too.
+
+From userland, you fill out an ipmi_req_t structure and use the
+IPMICTL_SEND_COMMAND ioctl. For incoming stuff, you can use select()
+or poll() to wait for messages to come in. However, you cannot use
+read() to get them, you must call the IPMICTL_RECEIVE_MSG with the
+ipmi_recv_t structure to actually get the message. Remember that you
+must supply a pointer to a block of data in the msg.data field, and
+you must fill in the msg.data_len field with the size of the data.
+This gives the receiver a place to actually put the message.
+
+If the message cannot fit into the data you provide, you will get an
+EMSGSIZE error and the driver will leave the data in the receive
+queue. If you want to get it and have it truncate the message, us
+the IPMICTL_RECEIVE_MSG_TRUNC ioctl.
+
+When you send a command (which is defined by the lowest-order bit of
+the netfn per the IPMI spec) on the IPMB bus, the driver will
+automatically assign the sequence number to the command and save the
+command. If the response is not receive in the IPMI-specified 5
+seconds, it will generate a response automatically saying the command
+timed out. If an unsolicited response comes in (if it was after 5
+seconds, for instance), that response will be ignored.
+
+In kernelland, after you receive a message and are done with it, you
+MUST call ipmi_free_recv_msg() on it, or you will leak messages. Note
+that you should NEVER mess with the "done" field of a message, that is
+required to properly clean up the message.
+
+Note that when sending, there is an ipmi_request_supply_msgs() call
+that lets you supply the smi and receive message. This is useful for
+pieces of code that need to work even if the system is out of buffers
+(the watchdog timer uses this, for instance). You supply your own
+buffer and own free routines. This is not recommended for normal use,
+though, since it is tricky to manage your own buffers.
+
+
+Events and Incoming Commands
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The driver takes care of polling for IPMI events and receiving
+commands (commands are messages that are not responses, they are
+commands that other things on the IPMB bus have sent you). To receive
+these, you must register for them, they will not automatically be sent
+to you.
+
+To receive events, you must call ipmi_set_gets_events() and set the
+"val" to non-zero. Any events that have been received by the driver
+since startup will immediately be delivered to the first user that
+registers for events. After that, if multiple users are registered
+for events, they will all receive all events that come in.
+
+For receiving commands, you have to individually register commands you
+want to receive. Call ipmi_register_for_cmd() and supply the netfn
+and command name for each command you want to receive. You also
+specify a bitmask of the channels you want to receive the command from
+(or use IPMI_CHAN_ALL for all channels if you don't care). Only one
+user may be registered for each netfn/cmd/channel, but different users
+may register for different commands, or the same command if the
+channel bitmasks do not overlap.
+
+To respond to a received command, set the response bit in the returned
+netfn, use the address from the received message, and use the same
+msgid that you got in the receive message.
+
+From userland, equivalent IOCTLs are provided to do these functions.
+
+
+The Lower Layer (SMI) Interface
+-------------------------------
+
+As mentioned before, multiple SMI interfaces may be registered to the
+message handler, each of these is assigned an interface number when
+they register with the message handler. They are generally assigned
+in the order they register, although if an SMI unregisters and then
+another one registers, all bets are off.
+
+The ipmi_smi.h defines the interface for management interfaces, see
+that for more details.
+
+
+The SI Driver
+-------------
+
+The SI driver allows KCS, BT, and SMIC interfaces to be configured
+in the system. It discovers interfaces through a host of different
+methods, depending on the system.
+
+You can specify up to four interfaces on the module load line and
+control some module parameters::
+
+ modprobe ipmi_si.o type=<type1>,<type2>....
+ ports=<port1>,<port2>... addrs=<addr1>,<addr2>...
+ irqs=<irq1>,<irq2>...
+ regspacings=<sp1>,<sp2>,... regsizes=<size1>,<size2>,...
+ regshifts=<shift1>,<shift2>,...
+ slave_addrs=<addr1>,<addr2>,...
+ force_kipmid=<enable1>,<enable2>,...
+ kipmid_max_busy_us=<ustime1>,<ustime2>,...
+ unload_when_empty=[0|1]
+ trydmi=[0|1] tryacpi=[0|1]
+ tryplatform=[0|1] trypci=[0|1]
+
+Each of these except try... items is a list, the first item for the
+first interface, second item for the second interface, etc.
+
+The si_type may be either "kcs", "smic", or "bt". If you leave it blank, it
+defaults to "kcs".
+
+If you specify addrs as non-zero for an interface, the driver will
+use the memory address given as the address of the device. This
+overrides si_ports.
+
+If you specify ports as non-zero for an interface, the driver will
+use the I/O port given as the device address.
+
+If you specify irqs as non-zero for an interface, the driver will
+attempt to use the given interrupt for the device.
+
+The other try... items disable discovery by their corresponding
+names. These are all enabled by default, set them to zero to disable
+them. The tryplatform disables openfirmware.
+
+The next three parameters have to do with register layout. The
+registers used by the interfaces may not appear at successive
+locations and they may not be in 8-bit registers. These parameters
+allow the layout of the data in the registers to be more precisely
+specified.
+
+The regspacings parameter give the number of bytes between successive
+register start addresses. For instance, if the regspacing is set to 4
+and the start address is 0xca2, then the address for the second
+register would be 0xca6. This defaults to 1.
+
+The regsizes parameter gives the size of a register, in bytes. The
+data used by IPMI is 8-bits wide, but it may be inside a larger
+register. This parameter allows the read and write type to specified.
+It may be 1, 2, 4, or 8. The default is 1.
+
+Since the register size may be larger than 32 bits, the IPMI data may not
+be in the lower 8 bits. The regshifts parameter give the amount to shift
+the data to get to the actual IPMI data.
+
+The slave_addrs specifies the IPMI address of the local BMC. This is
+usually 0x20 and the driver defaults to that, but in case it's not, it
+can be specified when the driver starts up.
+
+The force_ipmid parameter forcefully enables (if set to 1) or disables
+(if set to 0) the kernel IPMI daemon. Normally this is auto-detected
+by the driver, but systems with broken interrupts might need an enable,
+or users that don't want the daemon (don't need the performance, don't
+want the CPU hit) can disable it.
+
+If unload_when_empty is set to 1, the driver will be unloaded if it
+doesn't find any interfaces or all the interfaces fail to work. The
+default is one. Setting to 0 is useful with the hotmod, but is
+obviously only useful for modules.
+
+When compiled into the kernel, the parameters can be specified on the
+kernel command line as::
+
+ ipmi_si.type=<type1>,<type2>...
+ ipmi_si.ports=<port1>,<port2>... ipmi_si.addrs=<addr1>,<addr2>...
+ ipmi_si.irqs=<irq1>,<irq2>...
+ ipmi_si.regspacings=<sp1>,<sp2>,...
+ ipmi_si.regsizes=<size1>,<size2>,...
+ ipmi_si.regshifts=<shift1>,<shift2>,...
+ ipmi_si.slave_addrs=<addr1>,<addr2>,...
+ ipmi_si.force_kipmid=<enable1>,<enable2>,...
+ ipmi_si.kipmid_max_busy_us=<ustime1>,<ustime2>,...
+
+It works the same as the module parameters of the same names.
+
+If your IPMI interface does not support interrupts and is a KCS or
+SMIC interface, the IPMI driver will start a kernel thread for the
+interface to help speed things up. This is a low-priority kernel
+thread that constantly polls the IPMI driver while an IPMI operation
+is in progress. The force_kipmid module parameter will all the user to
+force this thread on or off. If you force it off and don't have
+interrupts, the driver will run VERY slowly. Don't blame me,
+these interfaces suck.
+
+Unfortunately, this thread can use a lot of CPU depending on the
+interface's performance. This can waste a lot of CPU and cause
+various issues with detecting idle CPU and using extra power. To
+avoid this, the kipmid_max_busy_us sets the maximum amount of time, in
+microseconds, that kipmid will spin before sleeping for a tick. This
+value sets a balance between performance and CPU waste and needs to be
+tuned to your needs. Maybe, someday, auto-tuning will be added, but
+that's not a simple thing and even the auto-tuning would need to be
+tuned to the user's desired performance.
+
+The driver supports a hot add and remove of interfaces. This way,
+interfaces can be added or removed after the kernel is up and running.
+This is done using /sys/modules/ipmi_si/parameters/hotmod, which is a
+write-only parameter. You write a string to this interface. The string
+has the format::
+
+ <op1>[:op2[:op3...]]
+
+The "op"s are::
+
+ add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]]
+
+You can specify more than one interface on the line. The "opt"s are::
+
+ rsp=<regspacing>
+ rsi=<regsize>
+ rsh=<regshift>
+ irq=<irq>
+ ipmb=<ipmb slave addr>
+
+and these have the same meanings as discussed above. Note that you
+can also use this on the kernel command line for a more compact format
+for specifying an interface. Note that when removing an interface,
+only the first three parameters (si type, address type, and address)
+are used for the comparison. Any options are ignored for removing.
+
+The SMBus Driver (SSIF)
+-----------------------
+
+The SMBus driver allows up to 4 SMBus devices to be configured in the
+system. By default, the driver will only register with something it
+finds in DMI or ACPI tables. You can change this
+at module load time (for a module) with::
+
+ modprobe ipmi_ssif.o
+ addr=<i2caddr1>[,<i2caddr2>[,...]]
+ adapter=<adapter1>[,<adapter2>[...]]
+ dbg=<flags1>,<flags2>...
+ slave_addrs=<addr1>,<addr2>,...
+ tryacpi=[0|1] trydmi=[0|1]
+ [dbg_probe=1]
+ alerts_broken
+
+The addresses are normal I2C addresses. The adapter is the string
+name of the adapter, as shown in /sys/class/i2c-adapter/i2c-<n>/name.
+It is *NOT* i2c-<n> itself. Also, the comparison is done ignoring
+spaces, so if the name is "This is an I2C chip" you can say
+adapter_name=ThisisanI2cchip. This is because it's hard to pass in
+spaces in kernel parameters.
+
+The debug flags are bit flags for each BMC found, they are:
+IPMI messages: 1, driver state: 2, timing: 4, I2C probe: 8
+
+The tryxxx parameters can be used to disable detecting interfaces
+from various sources.
+
+Setting dbg_probe to 1 will enable debugging of the probing and
+detection process for BMCs on the SMBusses.
+
+The slave_addrs specifies the IPMI address of the local BMC. This is
+usually 0x20 and the driver defaults to that, but in case it's not, it
+can be specified when the driver starts up.
+
+alerts_broken does not enable SMBus alert for SSIF. Otherwise SMBus
+alert will be enabled on supported hardware.
+
+Discovering the IPMI compliant BMC on the SMBus can cause devices on
+the I2C bus to fail. The SMBus driver writes a "Get Device ID" IPMI
+message as a block write to the I2C bus and waits for a response.
+This action can be detrimental to some I2C devices. It is highly
+recommended that the known I2C address be given to the SMBus driver in
+the smb_addr parameter unless you have DMI or ACPI data to tell the
+driver what to use.
+
+When compiled into the kernel, the addresses can be specified on the
+kernel command line as::
+
+ ipmb_ssif.addr=<i2caddr1>[,<i2caddr2>[...]]
+ ipmi_ssif.adapter=<adapter1>[,<adapter2>[...]]
+ ipmi_ssif.dbg=<flags1>[,<flags2>[...]]
+ ipmi_ssif.dbg_probe=1
+ ipmi_ssif.slave_addrs=<addr1>[,<addr2>[...]]
+ ipmi_ssif.tryacpi=[0|1] ipmi_ssif.trydmi=[0|1]
+
+These are the same options as on the module command line.
+
+The I2C driver does not support non-blocking access or polling, so
+this driver cannod to IPMI panic events, extend the watchdog at panic
+time, or other panic-related IPMI functions without special kernel
+patches and driver modifications. You can get those at the openipmi
+web page.
+
+The driver supports a hot add and remove of interfaces through the I2C
+sysfs interface.
+
+The IPMI IPMB Driver
+--------------------
+
+This driver is for supporting a system that sits on an IPMB bus; it
+allows the interface to look like a normal IPMI interface. Sending
+system interface addressed messages to it will cause the message to go
+to the registered BMC on the system (default at IPMI address 0x20).
+
+It also allows you to directly address other MCs on the bus using the
+ipmb direct addressing. You can receive commands from other MCs on
+the bus and they will be handled through the normal received command
+mechanism described above.
+
+Parameters are::
+
+ ipmi_ipmb.bmcaddr=<address to use for system interface addresses messages>
+ ipmi_ipmb.retry_time_ms=<Time between retries on IPMB>
+ ipmi_ipmb.max_retries=<Number of times to retry a message>
+
+Loading the module will not result in the driver automatcially
+starting unless there is device tree information setting it up. If
+you want to instantiate one of these by hand, do::
+
+ echo ipmi-ipmb <addr> > /sys/class/i2c-dev/i2c-<n>/device/new_device
+
+Note that the address you give here is the I2C address, not the IPMI
+address. So if you want your MC address to be 0x60, you put 0x30
+here. See the I2C driver info for more details.
+
+Command bridging to other IPMB busses through this interface does not
+work. The receive message queue is not implemented, by design. There
+is only one receive message queue on a BMC, and that is meant for the
+host drivers, not something on the IPMB bus.
+
+A BMC may have multiple IPMB busses, which bus your device sits on
+depends on how the system is wired. You can fetch the channels with
+"ipmitool channel info <n>" where <n> is the channel, with the
+channels being 0-7 and try the IPMB channels.
+
+Other Pieces
+------------
+
+Get the detailed info related with the IPMI device
+--------------------------------------------------
+
+Some users need more detailed information about a device, like where
+the address came from or the raw base device for the IPMI interface.
+You can use the IPMI smi_watcher to catch the IPMI interfaces as they
+come or go, and to grab the information, you can use the function
+ipmi_get_smi_info(), which returns the following structure::
+
+ struct ipmi_smi_info {
+ enum ipmi_addr_src addr_src;
+ struct device *dev;
+ union {
+ struct {
+ void *acpi_handle;
+ } acpi_info;
+ } addr_info;
+ };
+
+Currently special info for only for SI_ACPI address sources is
+returned. Others may be added as necessary.
+
+Note that the dev pointer is included in the above structure, and
+assuming ipmi_smi_get_info returns success, you must call put_device
+on the dev pointer.
+
+
+Watchdog
+--------
+
+A watchdog timer is provided that implements the Linux-standard
+watchdog timer interface. It has three module parameters that can be
+used to control it::
+
+ modprobe ipmi_watchdog timeout=<t> pretimeout=<t> action=<action type>
+ preaction=<preaction type> preop=<preop type> start_now=x
+ nowayout=x ifnum_to_use=n panic_wdt_timeout=<t>
+
+ifnum_to_use specifies which interface the watchdog timer should use.
+The default is -1, which means to pick the first one registered.
+
+The timeout is the number of seconds to the action, and the pretimeout
+is the amount of seconds before the reset that the pre-timeout panic will
+occur (if pretimeout is zero, then pretimeout will not be enabled). Note
+that the pretimeout is the time before the final timeout. So if the
+timeout is 50 seconds and the pretimeout is 10 seconds, then the pretimeout
+will occur in 40 second (10 seconds before the timeout). The panic_wdt_timeout
+is the value of timeout which is set on kernel panic, in order to let actions
+such as kdump to occur during panic.
+
+The action may be "reset", "power_cycle", or "power_off", and
+specifies what to do when the timer times out, and defaults to
+"reset".
+
+The preaction may be "pre_smi" for an indication through the SMI
+interface, "pre_int" for an indication through the SMI with an
+interrupts, and "pre_nmi" for a NMI on a preaction. This is how
+the driver is informed of the pretimeout.
+
+The preop may be set to "preop_none" for no operation on a pretimeout,
+"preop_panic" to set the preoperation to panic, or "preop_give_data"
+to provide data to read from the watchdog device when the pretimeout
+occurs. A "pre_nmi" setting CANNOT be used with "preop_give_data"
+because you can't do data operations from an NMI.
+
+When preop is set to "preop_give_data", one byte comes ready to read
+on the device when the pretimeout occurs. Select and fasync work on
+the device, as well.
+
+If start_now is set to 1, the watchdog timer will start running as
+soon as the driver is loaded.
+
+If nowayout is set to 1, the watchdog timer will not stop when the
+watchdog device is closed. The default value of nowayout is true
+if the CONFIG_WATCHDOG_NOWAYOUT option is enabled, or false if not.
+
+When compiled into the kernel, the kernel command line is available
+for configuring the watchdog::
+
+ ipmi_watchdog.timeout=<t> ipmi_watchdog.pretimeout=<t>
+ ipmi_watchdog.action=<action type>
+ ipmi_watchdog.preaction=<preaction type>
+ ipmi_watchdog.preop=<preop type>
+ ipmi_watchdog.start_now=x
+ ipmi_watchdog.nowayout=x
+ ipmi_watchdog.panic_wdt_timeout=<t>
+
+The options are the same as the module parameter options.
+
+The watchdog will panic and start a 120 second reset timeout if it
+gets a pre-action. During a panic or a reboot, the watchdog will
+start a 120 timer if it is running to make sure the reboot occurs.
+
+Note that if you use the NMI preaction for the watchdog, you MUST NOT
+use the nmi watchdog. There is no reasonable way to tell if an NMI
+comes from the IPMI controller, so it must assume that if it gets an
+otherwise unhandled NMI, it must be from IPMI and it will panic
+immediately.
+
+Once you open the watchdog timer, you must write a 'V' character to the
+device to close it, or the timer will not stop. This is a new semantic
+for the driver, but makes it consistent with the rest of the watchdog
+drivers in Linux.
+
+
+Panic Timeouts
+--------------
+
+The OpenIPMI driver supports the ability to put semi-custom and custom
+events in the system event log if a panic occurs. if you enable the
+'Generate a panic event to all BMCs on a panic' option, you will get
+one event on a panic in a standard IPMI event format. If you enable
+the 'Generate OEM events containing the panic string' option, you will
+also get a bunch of OEM events holding the panic string.
+
+
+The field settings of the events are:
+
+* Generator ID: 0x21 (kernel)
+* EvM Rev: 0x03 (this event is formatting in IPMI 1.0 format)
+* Sensor Type: 0x20 (OS critical stop sensor)
+* Sensor #: The first byte of the panic string (0 if no panic string)
+* Event Dir | Event Type: 0x6f (Assertion, sensor-specific event info)
+* Event Data 1: 0xa1 (Runtime stop in OEM bytes 2 and 3)
+* Event data 2: second byte of panic string
+* Event data 3: third byte of panic string
+
+See the IPMI spec for the details of the event layout. This event is
+always sent to the local management controller. It will handle routing
+the message to the right place
+
+Other OEM events have the following format:
+
+* Record ID (bytes 0-1): Set by the SEL.
+* Record type (byte 2): 0xf0 (OEM non-timestamped)
+* byte 3: The slave address of the card saving the panic
+* byte 4: A sequence number (starting at zero)
+ The rest of the bytes (11 bytes) are the panic string. If the panic string
+ is longer than 11 bytes, multiple messages will be sent with increasing
+ sequence numbers.
+
+Because you cannot send OEM events using the standard interface, this
+function will attempt to find an SEL and add the events there. It
+will first query the capabilities of the local management controller.
+If it has an SEL, then they will be stored in the SEL of the local
+management controller. If not, and the local management controller is
+an event generator, the event receiver from the local management
+controller will be queried and the events sent to the SEL on that
+device. Otherwise, the events go nowhere since there is nowhere to
+send them.
+
+
+Poweroff
+--------
+
+If the poweroff capability is selected, the IPMI driver will install
+a shutdown function into the standard poweroff function pointer. This
+is in the ipmi_poweroff module. When the system requests a powerdown,
+it will send the proper IPMI commands to do this. This is supported on
+several platforms.
+
+There is a module parameter named "poweroff_powercycle" that may
+either be zero (do a power down) or non-zero (do a power cycle, power
+the system off, then power it on in a few seconds). Setting
+ipmi_poweroff.poweroff_control=x will do the same thing on the kernel
+command line. The parameter is also available via the proc filesystem
+in /proc/sys/dev/ipmi/poweroff_powercycle. Note that if the system
+does not support power cycling, it will always do the power off.
+
+The "ifnum_to_use" parameter specifies which interface the poweroff
+code should use. The default is -1, which means to pick the first one
+registered.
+
+Note that if you have ACPI enabled, the system will prefer using ACPI to
+power off.
diff --git a/Documentation/driver-api/isa.rst b/Documentation/driver-api/isa.rst
new file mode 100644
index 0000000000..3df1b16965
--- /dev/null
+++ b/Documentation/driver-api/isa.rst
@@ -0,0 +1,122 @@
+===========
+ISA Drivers
+===========
+
+The following text is adapted from the commit message of the initial
+commit of the ISA bus driver authored by Rene Herman.
+
+During the recent "isa drivers using platform devices" discussion it was
+pointed out that (ALSA) ISA drivers ran into the problem of not having
+the option to fail driver load (device registration rather) upon not
+finding their hardware due to a probe() error not being passed up
+through the driver model. In the course of that, I suggested a separate
+ISA bus might be best; Russell King agreed and suggested this bus could
+use the .match() method for the actual device discovery.
+
+The attached does this. For this old non (generically) discoverable ISA
+hardware only the driver itself can do discovery so as a difference with
+the platform_bus, this isa_bus also distributes match() up to the
+driver.
+
+As another difference: these devices only exist in the driver model due
+to the driver creating them because it might want to drive them, meaning
+that all device creation has been made internal as well.
+
+The usage model this provides is nice, and has been acked from the ALSA
+side by Takashi Iwai and Jaroslav Kysela. The ALSA driver module_init's
+now (for oldisa-only drivers) become::
+
+ static int __init alsa_card_foo_init(void)
+ {
+ return isa_register_driver(&snd_foo_isa_driver, SNDRV_CARDS);
+ }
+
+ static void __exit alsa_card_foo_exit(void)
+ {
+ isa_unregister_driver(&snd_foo_isa_driver);
+ }
+
+Quite like the other bus models therefore. This removes a lot of
+duplicated init code from the ALSA ISA drivers.
+
+The passed in isa_driver struct is the regular driver struct embedding a
+struct device_driver, the normal probe/remove/shutdown/suspend/resume
+callbacks, and as indicated that .match callback.
+
+The "SNDRV_CARDS" you see being passed in is a "unsigned int ndev"
+parameter, indicating how many devices to create and call our methods
+with.
+
+The platform_driver callbacks are called with a platform_device param;
+the isa_driver callbacks are being called with a ``struct device *dev,
+unsigned int id`` pair directly -- with the device creation completely
+internal to the bus it's much cleaner to not leak isa_dev's by passing
+them in at all. The id is the only thing we ever want other then the
+struct device anyways, and it makes for nicer code in the callbacks as
+well.
+
+With this additional .match() callback ISA drivers have all options. If
+ALSA would want to keep the old non-load behaviour, it could stick all
+of the old .probe in .match, which would only keep them registered after
+everything was found to be present and accounted for. If it wanted the
+behaviour of always loading as it inadvertently did for a bit after the
+changeover to platform devices, it could just not provide a .match() and
+do everything in .probe() as before.
+
+If it, as Takashi Iwai already suggested earlier as a way of following
+the model from saner buses more closely, wants to load when a later bind
+could conceivably succeed, it could use .match() for the prerequisites
+(such as checking the user wants the card enabled and that port/irq/dma
+values have been passed in) and .probe() for everything else. This is
+the nicest model.
+
+To the code...
+
+This exports only two functions; isa_{,un}register_driver().
+
+isa_register_driver() register's the struct device_driver, and then
+loops over the passed in ndev creating devices and registering them.
+This causes the bus match method to be called for them, which is::
+
+ int isa_bus_match(struct device *dev, struct device_driver *driver)
+ {
+ struct isa_driver *isa_driver = to_isa_driver(driver);
+
+ if (dev->platform_data == isa_driver) {
+ if (!isa_driver->match ||
+ isa_driver->match(dev, to_isa_dev(dev)->id))
+ return 1;
+ dev->platform_data = NULL;
+ }
+ return 0;
+ }
+
+The first thing this does is check if this device is in fact one of this
+driver's devices by seeing if the device's platform_data pointer is set
+to this driver. Platform devices compare strings, but we don't need to
+do that with everything being internal, so isa_register_driver() abuses
+dev->platform_data as a isa_driver pointer which we can then check here.
+I believe platform_data is available for this, but if rather not, moving
+the isa_driver pointer to the private struct isa_dev is ofcourse fine as
+well.
+
+Then, if the driver did not provide a .match, it matches. If it did,
+the driver match() method is called to determine a match.
+
+If it did **not** match, dev->platform_data is reset to indicate this to
+isa_register_driver which can then unregister the device again.
+
+If during all this, there's any error, or no devices matched at all
+everything is backed out again and the error, or -ENODEV, is returned.
+
+isa_unregister_driver() just unregisters the matched devices and the
+driver itself.
+
+module_isa_driver is a helper macro for ISA drivers which do not do
+anything special in module init/exit. This eliminates a lot of
+boilerplate code. Each module may only use this macro once, and calling
+it replaces module_init and module_exit.
+
+max_num_isa_dev is a macro to determine the maximum possible number of
+ISA devices which may be registered in the I/O port address space given
+the address extent of the ISA devices.
diff --git a/Documentation/driver-api/isapnp.rst b/Documentation/driver-api/isapnp.rst
new file mode 100644
index 0000000000..8d0840ac84
--- /dev/null
+++ b/Documentation/driver-api/isapnp.rst
@@ -0,0 +1,15 @@
+==========================================================
+ISA Plug & Play support by Jaroslav Kysela <perex@suse.cz>
+==========================================================
+
+Interface /proc/isapnp
+======================
+
+The interface has been removed. See pnp.txt for more details.
+
+Interface /proc/bus/isapnp
+==========================
+
+This directory allows access to ISA PnP cards and logical devices.
+The regular files contain the contents of ISA PnP registers for
+a logical device.
diff --git a/Documentation/driver-api/libata.rst b/Documentation/driver-api/libata.rst
new file mode 100644
index 0000000000..5da27a7492
--- /dev/null
+++ b/Documentation/driver-api/libata.rst
@@ -0,0 +1,993 @@
+========================
+libATA Developer's Guide
+========================
+
+:Author: Jeff Garzik
+
+Introduction
+============
+
+libATA is a library used inside the Linux kernel to support ATA host
+controllers and devices. libATA provides an ATA driver API, class
+transports for ATA and ATAPI devices, and SCSI<->ATA translation for ATA
+devices according to the T10 SAT specification.
+
+This Guide documents the libATA driver API, library functions, library
+internals, and a couple sample ATA low-level drivers.
+
+libata Driver API
+=================
+
+:c:type:`struct ata_port_operations <ata_port_operations>`
+is defined for every low-level libata
+hardware driver, and it controls how the low-level driver interfaces
+with the ATA and SCSI layers.
+
+FIS-based drivers will hook into the system with ``->qc_prep()`` and
+``->qc_issue()`` high-level hooks. Hardware which behaves in a manner
+similar to PCI IDE hardware may utilize several generic helpers,
+defining at a bare minimum the bus I/O addresses of the ATA shadow
+register blocks.
+
+:c:type:`struct ata_port_operations <ata_port_operations>`
+----------------------------------------------------------
+
+Post-IDENTIFY device configuration
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ void (*dev_config) (struct ata_port *, struct ata_device *);
+
+
+Called after IDENTIFY [PACKET] DEVICE is issued to each device found.
+Typically used to apply device-specific fixups prior to issue of SET
+FEATURES - XFER MODE, and prior to operation.
+
+This entry may be specified as NULL in ata_port_operations.
+
+Set PIO/DMA mode
+~~~~~~~~~~~~~~~~
+
+::
+
+ void (*set_piomode) (struct ata_port *, struct ata_device *);
+ void (*set_dmamode) (struct ata_port *, struct ata_device *);
+ void (*post_set_mode) (struct ata_port *);
+ unsigned int (*mode_filter) (struct ata_port *, struct ata_device *, unsigned int);
+
+
+Hooks called prior to the issue of SET FEATURES - XFER MODE command. The
+optional ``->mode_filter()`` hook is called when libata has built a mask of
+the possible modes. This is passed to the ``->mode_filter()`` function
+which should return a mask of valid modes after filtering those
+unsuitable due to hardware limits. It is not valid to use this interface
+to add modes.
+
+``dev->pio_mode`` and ``dev->dma_mode`` are guaranteed to be valid when
+``->set_piomode()`` and when ``->set_dmamode()`` is called. The timings for
+any other drive sharing the cable will also be valid at this point. That
+is the library records the decisions for the modes of each drive on a
+channel before it attempts to set any of them.
+
+``->post_set_mode()`` is called unconditionally, after the SET FEATURES -
+XFER MODE command completes successfully.
+
+``->set_piomode()`` is always called (if present), but ``->set_dma_mode()``
+is only called if DMA is possible.
+
+Taskfile read/write
+~~~~~~~~~~~~~~~~~~~
+
+::
+
+ void (*sff_tf_load) (struct ata_port *ap, struct ata_taskfile *tf);
+ void (*sff_tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
+
+
+``->tf_load()`` is called to load the given taskfile into hardware
+registers / DMA buffers. ``->tf_read()`` is called to read the hardware
+registers / DMA buffers, to obtain the current set of taskfile register
+values. Most drivers for taskfile-based hardware (PIO or MMIO) use
+:c:func:`ata_sff_tf_load` and :c:func:`ata_sff_tf_read` for these hooks.
+
+PIO data read/write
+~~~~~~~~~~~~~~~~~~~
+
+::
+
+ void (*sff_data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
+
+
+All bmdma-style drivers must implement this hook. This is the low-level
+operation that actually copies the data bytes during a PIO data
+transfer. Typically the driver will choose one of
+:c:func:`ata_sff_data_xfer`, or :c:func:`ata_sff_data_xfer32`.
+
+ATA command execute
+~~~~~~~~~~~~~~~~~~~
+
+::
+
+ void (*sff_exec_command)(struct ata_port *ap, struct ata_taskfile *tf);
+
+
+causes an ATA command, previously loaded with ``->tf_load()``, to be
+initiated in hardware. Most drivers for taskfile-based hardware use
+:c:func:`ata_sff_exec_command` for this hook.
+
+Per-cmd ATAPI DMA capabilities filter
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ int (*check_atapi_dma) (struct ata_queued_cmd *qc);
+
+
+Allow low-level driver to filter ATA PACKET commands, returning a status
+indicating whether or not it is OK to use DMA for the supplied PACKET
+command.
+
+This hook may be specified as NULL, in which case libata will assume
+that atapi dma can be supported.
+
+Read specific ATA shadow registers
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ u8 (*sff_check_status)(struct ata_port *ap);
+ u8 (*sff_check_altstatus)(struct ata_port *ap);
+
+
+Reads the Status/AltStatus ATA shadow register from hardware. On some
+hardware, reading the Status register has the side effect of clearing
+the interrupt condition. Most drivers for taskfile-based hardware use
+:c:func:`ata_sff_check_status` for this hook.
+
+Write specific ATA shadow register
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ void (*sff_set_devctl)(struct ata_port *ap, u8 ctl);
+
+
+Write the device control ATA shadow register to the hardware. Most
+drivers don't need to define this.
+
+Select ATA device on bus
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ void (*sff_dev_select)(struct ata_port *ap, unsigned int device);
+
+
+Issues the low-level hardware command(s) that causes one of N hardware
+devices to be considered 'selected' (active and available for use) on
+the ATA bus. This generally has no meaning on FIS-based devices.
+
+Most drivers for taskfile-based hardware use :c:func:`ata_sff_dev_select` for
+this hook.
+
+Private tuning method
+~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ void (*set_mode) (struct ata_port *ap);
+
+
+By default libata performs drive and controller tuning in accordance
+with the ATA timing rules and also applies blacklists and cable limits.
+Some controllers need special handling and have custom tuning rules,
+typically raid controllers that use ATA commands but do not actually do
+drive timing.
+
+ **Warning**
+
+ This hook should not be used to replace the standard controller
+ tuning logic when a controller has quirks. Replacing the default
+ tuning logic in that case would bypass handling for drive and bridge
+ quirks that may be important to data reliability. If a controller
+ needs to filter the mode selection it should use the mode_filter
+ hook instead.
+
+Control PCI IDE BMDMA engine
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ void (*bmdma_setup) (struct ata_queued_cmd *qc);
+ void (*bmdma_start) (struct ata_queued_cmd *qc);
+ void (*bmdma_stop) (struct ata_port *ap);
+ u8 (*bmdma_status) (struct ata_port *ap);
+
+
+When setting up an IDE BMDMA transaction, these hooks arm
+(``->bmdma_setup``), fire (``->bmdma_start``), and halt (``->bmdma_stop``) the
+hardware's DMA engine. ``->bmdma_status`` is used to read the standard PCI
+IDE DMA Status register.
+
+These hooks are typically either no-ops, or simply not implemented, in
+FIS-based drivers.
+
+Most legacy IDE drivers use :c:func:`ata_bmdma_setup` for the
+:c:func:`bmdma_setup` hook. :c:func:`ata_bmdma_setup` will write the pointer
+to the PRD table to the IDE PRD Table Address register, enable DMA in the DMA
+Command register, and call :c:func:`exec_command` to begin the transfer.
+
+Most legacy IDE drivers use :c:func:`ata_bmdma_start` for the
+:c:func:`bmdma_start` hook. :c:func:`ata_bmdma_start` will write the
+ATA_DMA_START flag to the DMA Command register.
+
+Many legacy IDE drivers use :c:func:`ata_bmdma_stop` for the
+:c:func:`bmdma_stop` hook. :c:func:`ata_bmdma_stop` clears the ATA_DMA_START
+flag in the DMA command register.
+
+Many legacy IDE drivers use :c:func:`ata_bmdma_status` as the
+:c:func:`bmdma_status` hook.
+
+High-level taskfile hooks
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ enum ata_completion_errors (*qc_prep) (struct ata_queued_cmd *qc);
+ int (*qc_issue) (struct ata_queued_cmd *qc);
+
+
+Higher-level hooks, these two hooks can potentially supersede several of
+the above taskfile/DMA engine hooks. ``->qc_prep`` is called after the
+buffers have been DMA-mapped, and is typically used to populate the
+hardware's DMA scatter-gather table. Some drivers use the standard
+:c:func:`ata_bmdma_qc_prep` and :c:func:`ata_bmdma_dumb_qc_prep` helper
+functions, but more advanced drivers roll their own.
+
+``->qc_issue`` is used to make a command active, once the hardware and S/G
+tables have been prepared. IDE BMDMA drivers use the helper function
+:c:func:`ata_sff_qc_issue` for taskfile protocol-based dispatch. More
+advanced drivers implement their own ``->qc_issue``.
+
+:c:func:`ata_sff_qc_issue` calls ``->sff_tf_load()``, ``->bmdma_setup()``, and
+``->bmdma_start()`` as necessary to initiate a transfer.
+
+Exception and probe handling (EH)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ void (*freeze) (struct ata_port *ap);
+ void (*thaw) (struct ata_port *ap);
+
+
+:c:func:`ata_port_freeze` is called when HSM violations or some other
+condition disrupts normal operation of the port. A frozen port is not
+allowed to perform any operation until the port is thawed, which usually
+follows a successful reset.
+
+The optional ``->freeze()`` callback can be used for freezing the port
+hardware-wise (e.g. mask interrupt and stop DMA engine). If a port
+cannot be frozen hardware-wise, the interrupt handler must ack and clear
+interrupts unconditionally while the port is frozen.
+
+The optional ``->thaw()`` callback is called to perform the opposite of
+``->freeze()``: prepare the port for normal operation once again. Unmask
+interrupts, start DMA engine, etc.
+
+::
+
+ void (*error_handler) (struct ata_port *ap);
+
+
+``->error_handler()`` is a driver's hook into probe, hotplug, and recovery
+and other exceptional conditions. The primary responsibility of an
+implementation is to call :c:func:`ata_do_eh` or :c:func:`ata_bmdma_drive_eh`
+with a set of EH hooks as arguments:
+
+'prereset' hook (may be NULL) is called during an EH reset, before any
+other actions are taken.
+
+'postreset' hook (may be NULL) is called after the EH reset is
+performed. Based on existing conditions, severity of the problem, and
+hardware capabilities,
+
+Either 'softreset' (may be NULL) or 'hardreset' (may be NULL) will be
+called to perform the low-level EH reset.
+
+::
+
+ void (*post_internal_cmd) (struct ata_queued_cmd *qc);
+
+
+Perform any hardware-specific actions necessary to finish processing
+after executing a probe-time or EH-time command via
+:c:func:`ata_exec_internal`.
+
+Hardware interrupt handling
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+ irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
+ void (*irq_clear) (struct ata_port *);
+
+
+``->irq_handler`` is the interrupt handling routine registered with the
+system, by libata. ``->irq_clear`` is called during probe just before the
+interrupt handler is registered, to be sure hardware is quiet.
+
+The second argument, dev_instance, should be cast to a pointer to
+:c:type:`struct ata_host_set <ata_host_set>`.
+
+Most legacy IDE drivers use :c:func:`ata_sff_interrupt` for the irq_handler
+hook, which scans all ports in the host_set, determines which queued
+command was active (if any), and calls ata_sff_host_intr(ap,qc).
+
+Most legacy IDE drivers use :c:func:`ata_sff_irq_clear` for the
+:c:func:`irq_clear` hook, which simply clears the interrupt and error flags
+in the DMA status register.
+
+SATA phy read/write
+~~~~~~~~~~~~~~~~~~~
+
+::
+
+ int (*scr_read) (struct ata_port *ap, unsigned int sc_reg,
+ u32 *val);
+ int (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
+ u32 val);
+
+
+Read and write standard SATA phy registers.
+sc_reg is one of SCR_STATUS, SCR_CONTROL, SCR_ERROR, or SCR_ACTIVE.
+
+Init and shutdown
+~~~~~~~~~~~~~~~~~
+
+::
+
+ int (*port_start) (struct ata_port *ap);
+ void (*port_stop) (struct ata_port *ap);
+ void (*host_stop) (struct ata_host_set *host_set);
+
+
+``->port_start()`` is called just after the data structures for each port
+are initialized. Typically this is used to alloc per-port DMA buffers /
+tables / rings, enable DMA engines, and similar tasks. Some drivers also
+use this entry point as a chance to allocate driver-private memory for
+``ap->private_data``.
+
+Many drivers use :c:func:`ata_port_start` as this hook or call it from their
+own :c:func:`port_start` hooks. :c:func:`ata_port_start` allocates space for
+a legacy IDE PRD table and returns.
+
+``->port_stop()`` is called after ``->host_stop()``. Its sole function is to
+release DMA/memory resources, now that they are no longer actively being
+used. Many drivers also free driver-private data from port at this time.
+
+``->host_stop()`` is called after all ``->port_stop()`` calls have completed.
+The hook must finalize hardware shutdown, release DMA and other
+resources, etc. This hook may be specified as NULL, in which case it is
+not called.
+
+Error handling
+==============
+
+This chapter describes how errors are handled under libata. Readers are
+advised to read SCSI EH (Documentation/scsi/scsi_eh.rst) and ATA
+exceptions doc first.
+
+Origins of commands
+-------------------
+
+In libata, a command is represented with
+:c:type:`struct ata_queued_cmd <ata_queued_cmd>` or qc.
+qc's are preallocated during port initialization and repetitively used
+for command executions. Currently only one qc is allocated per port but
+yet-to-be-merged NCQ branch allocates one for each tag and maps each qc
+to NCQ tag 1-to-1.
+
+libata commands can originate from two sources - libata itself and SCSI
+midlayer. libata internal commands are used for initialization and error
+handling. All normal blk requests and commands for SCSI emulation are
+passed as SCSI commands through queuecommand callback of SCSI host
+template.
+
+How commands are issued
+-----------------------
+
+Internal commands
+ Once allocated qc's taskfile is initialized for the command to be
+ executed. qc currently has two mechanisms to notify completion. One
+ is via ``qc->complete_fn()`` callback and the other is completion
+ ``qc->waiting``. ``qc->complete_fn()`` callback is the asynchronous path
+ used by normal SCSI translated commands and ``qc->waiting`` is the
+ synchronous (issuer sleeps in process context) path used by internal
+ commands.
+
+ Once initialization is complete, host_set lock is acquired and the
+ qc is issued.
+
+SCSI commands
+ All libata drivers use :c:func:`ata_scsi_queuecmd` as
+ ``hostt->queuecommand`` callback. scmds can either be simulated or
+ translated. No qc is involved in processing a simulated scmd. The
+ result is computed right away and the scmd is completed.
+
+ ``qc->complete_fn()`` callback is used for completion notification. ATA
+ commands use :c:func:`ata_scsi_qc_complete` while ATAPI commands use
+ :c:func:`atapi_qc_complete`. Both functions end up calling ``qc->scsidone``
+ to notify upper layer when the qc is finished. After translation is
+ completed, the qc is issued with :c:func:`ata_qc_issue`.
+
+ Note that SCSI midlayer invokes hostt->queuecommand while holding
+ host_set lock, so all above occur while holding host_set lock.
+
+How commands are processed
+--------------------------
+
+Depending on which protocol and which controller are used, commands are
+processed differently. For the purpose of discussion, a controller which
+uses taskfile interface and all standard callbacks is assumed.
+
+Currently 6 ATA command protocols are used. They can be sorted into the
+following four categories according to how they are processed.
+
+ATA NO DATA or DMA
+ ATA_PROT_NODATA and ATA_PROT_DMA fall into this category. These
+ types of commands don't require any software intervention once
+ issued. Device will raise interrupt on completion.
+
+ATA PIO
+ ATA_PROT_PIO is in this category. libata currently implements PIO
+ with polling. ATA_NIEN bit is set to turn off interrupt and
+ pio_task on ata_wq performs polling and IO.
+
+ATAPI NODATA or DMA
+ ATA_PROT_ATAPI_NODATA and ATA_PROT_ATAPI_DMA are in this
+ category. packet_task is used to poll BSY bit after issuing PACKET
+ command. Once BSY is turned off by the device, packet_task
+ transfers CDB and hands off processing to interrupt handler.
+
+ATAPI PIO
+ ATA_PROT_ATAPI is in this category. ATA_NIEN bit is set and, as
+ in ATAPI NODATA or DMA, packet_task submits cdb. However, after
+ submitting cdb, further processing (data transfer) is handed off to
+ pio_task.
+
+How commands are completed
+--------------------------
+
+Once issued, all qc's are either completed with :c:func:`ata_qc_complete` or
+time out. For commands which are handled by interrupts,
+:c:func:`ata_host_intr` invokes :c:func:`ata_qc_complete`, and, for PIO tasks,
+pio_task invokes :c:func:`ata_qc_complete`. In error cases, packet_task may
+also complete commands.
+
+:c:func:`ata_qc_complete` does the following.
+
+1. DMA memory is unmapped.
+
+2. ATA_QCFLAG_ACTIVE is cleared from qc->flags.
+
+3. :c:expr:`qc->complete_fn` callback is invoked. If the return value of the
+ callback is not zero. Completion is short circuited and
+ :c:func:`ata_qc_complete` returns.
+
+4. :c:func:`__ata_qc_complete` is called, which does
+
+ 1. ``qc->flags`` is cleared to zero.
+
+ 2. ``ap->active_tag`` and ``qc->tag`` are poisoned.
+
+ 3. ``qc->waiting`` is cleared & completed (in that order).
+
+ 4. qc is deallocated by clearing appropriate bit in ``ap->qactive``.
+
+So, it basically notifies upper layer and deallocates qc. One exception
+is short-circuit path in #3 which is used by :c:func:`atapi_qc_complete`.
+
+For all non-ATAPI commands, whether it fails or not, almost the same
+code path is taken and very little error handling takes place. A qc is
+completed with success status if it succeeded, with failed status
+otherwise.
+
+However, failed ATAPI commands require more handling as REQUEST SENSE is
+needed to acquire sense data. If an ATAPI command fails,
+:c:func:`ata_qc_complete` is invoked with error status, which in turn invokes
+:c:func:`atapi_qc_complete` via ``qc->complete_fn()`` callback.
+
+This makes :c:func:`atapi_qc_complete` set ``scmd->result`` to
+SAM_STAT_CHECK_CONDITION, complete the scmd and return 1. As the
+sense data is empty but ``scmd->result`` is CHECK CONDITION, SCSI midlayer
+will invoke EH for the scmd, and returning 1 makes :c:func:`ata_qc_complete`
+to return without deallocating the qc. This leads us to
+:c:func:`ata_scsi_error` with partially completed qc.
+
+:c:func:`ata_scsi_error`
+------------------------
+
+:c:func:`ata_scsi_error` is the current ``transportt->eh_strategy_handler()``
+for libata. As discussed above, this will be entered in two cases -
+timeout and ATAPI error completion. This function will check if a qc is active
+and has not failed yet. Such a qc will be marked with AC_ERR_TIMEOUT such that
+EH will know to handle it later. Then it calls low level libata driver's
+:c:func:`error_handler` callback.
+
+When the :c:func:`error_handler` callback is invoked it stops BMDMA and
+completes the qc. Note that as we're currently in EH, we cannot call
+scsi_done. As described in SCSI EH doc, a recovered scmd should be
+either retried with :c:func:`scsi_queue_insert` or finished with
+:c:func:`scsi_finish_command`. Here, we override ``qc->scsidone`` with
+:c:func:`scsi_finish_command` and calls :c:func:`ata_qc_complete`.
+
+If EH is invoked due to a failed ATAPI qc, the qc here is completed but
+not deallocated. The purpose of this half-completion is to use the qc as
+place holder to make EH code reach this place. This is a bit hackish,
+but it works.
+
+Once control reaches here, the qc is deallocated by invoking
+:c:func:`__ata_qc_complete` explicitly. Then, internal qc for REQUEST SENSE
+is issued. Once sense data is acquired, scmd is finished by directly
+invoking :c:func:`scsi_finish_command` on the scmd. Note that as we already
+have completed and deallocated the qc which was associated with the
+scmd, we don't need to/cannot call :c:func:`ata_qc_complete` again.
+
+Problems with the current EH
+----------------------------
+
+- Error representation is too crude. Currently any and all error
+ conditions are represented with ATA STATUS and ERROR registers.
+ Errors which aren't ATA device errors are treated as ATA device
+ errors by setting ATA_ERR bit. Better error descriptor which can
+ properly represent ATA and other errors/exceptions is needed.
+
+- When handling timeouts, no action is taken to make device forget
+ about the timed out command and ready for new commands.
+
+- EH handling via :c:func:`ata_scsi_error` is not properly protected from
+ usual command processing. On EH entrance, the device is not in
+ quiescent state. Timed out commands may succeed or fail any time.
+ pio_task and atapi_task may still be running.
+
+- Too weak error recovery. Devices / controllers causing HSM mismatch
+ errors and other errors quite often require reset to return to known
+ state. Also, advanced error handling is necessary to support features
+ like NCQ and hotplug.
+
+- ATA errors are directly handled in the interrupt handler and PIO
+ errors in pio_task. This is problematic for advanced error handling
+ for the following reasons.
+
+ First, advanced error handling often requires context and internal qc
+ execution.
+
+ Second, even a simple failure (say, CRC error) needs information
+ gathering and could trigger complex error handling (say, resetting &
+ reconfiguring). Having multiple code paths to gather information,
+ enter EH and trigger actions makes life painful.
+
+ Third, scattered EH code makes implementing low level drivers
+ difficult. Low level drivers override libata callbacks. If EH is
+ scattered over several places, each affected callbacks should perform
+ its part of error handling. This can be error prone and painful.
+
+libata Library
+==============
+
+.. kernel-doc:: drivers/ata/libata-core.c
+ :export:
+
+libata Core Internals
+=====================
+
+.. kernel-doc:: drivers/ata/libata-core.c
+ :internal:
+
+.. kernel-doc:: drivers/ata/libata-eh.c
+
+libata SCSI translation/emulation
+=================================
+
+.. kernel-doc:: drivers/ata/libata-scsi.c
+ :export:
+
+.. kernel-doc:: drivers/ata/libata-scsi.c
+ :internal:
+
+ATA errors and exceptions
+=========================
+
+This chapter tries to identify what error/exception conditions exist for
+ATA/ATAPI devices and describe how they should be handled in
+implementation-neutral way.
+
+The term 'error' is used to describe conditions where either an explicit
+error condition is reported from device or a command has timed out.
+
+The term 'exception' is either used to describe exceptional conditions
+which are not errors (say, power or hotplug events), or to describe both
+errors and non-error exceptional conditions. Where explicit distinction
+between error and exception is necessary, the term 'non-error exception'
+is used.
+
+Exception categories
+--------------------
+
+Exceptions are described primarily with respect to legacy taskfile + bus
+master IDE interface. If a controller provides other better mechanism
+for error reporting, mapping those into categories described below
+shouldn't be difficult.
+
+In the following sections, two recovery actions - reset and
+reconfiguring transport - are mentioned. These are described further in
+`EH recovery actions <#exrec>`__.
+
+HSM violation
+~~~~~~~~~~~~~
+
+This error is indicated when STATUS value doesn't match HSM requirement
+during issuing or execution any ATA/ATAPI command.
+
+- ATA_STATUS doesn't contain !BSY && DRDY && !DRQ while trying to
+ issue a command.
+
+- !BSY && !DRQ during PIO data transfer.
+
+- DRQ on command completion.
+
+- !BSY && ERR after CDB transfer starts but before the last byte of CDB
+ is transferred. ATA/ATAPI standard states that "The device shall not
+ terminate the PACKET command with an error before the last byte of
+ the command packet has been written" in the error outputs description
+ of PACKET command and the state diagram doesn't include such
+ transitions.
+
+In these cases, HSM is violated and not much information regarding the
+error can be acquired from STATUS or ERROR register. IOW, this error can
+be anything - driver bug, faulty device, controller and/or cable.
+
+As HSM is violated, reset is necessary to restore known state.
+Reconfiguring transport for lower speed might be helpful too as
+transmission errors sometimes cause this kind of errors.
+
+ATA/ATAPI device error (non-NCQ / non-CHECK CONDITION)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+These are errors detected and reported by ATA/ATAPI devices indicating
+device problems. For this type of errors, STATUS and ERROR register
+values are valid and describe error condition. Note that some of ATA bus
+errors are detected by ATA/ATAPI devices and reported using the same
+mechanism as device errors. Those cases are described later in this
+section.
+
+For ATA commands, this type of errors are indicated by !BSY && ERR
+during command execution and on completion.
+
+For ATAPI commands,
+
+- !BSY && ERR && ABRT right after issuing PACKET indicates that PACKET
+ command is not supported and falls in this category.
+
+- !BSY && ERR(==CHK) && !ABRT after the last byte of CDB is transferred
+ indicates CHECK CONDITION and doesn't fall in this category.
+
+- !BSY && ERR(==CHK) && ABRT after the last byte of CDB is transferred
+ \*probably\* indicates CHECK CONDITION and doesn't fall in this
+ category.
+
+Of errors detected as above, the following are not ATA/ATAPI device
+errors but ATA bus errors and should be handled according to
+`ATA bus error <#excatATAbusErr>`__.
+
+CRC error during data transfer
+ This is indicated by ICRC bit in the ERROR register and means that
+ corruption occurred during data transfer. Up to ATA/ATAPI-7, the
+ standard specifies that this bit is only applicable to UDMA
+ transfers but ATA/ATAPI-8 draft revision 1f says that the bit may be
+ applicable to multiword DMA and PIO.
+
+ABRT error during data transfer or on completion
+ Up to ATA/ATAPI-7, the standard specifies that ABRT could be set on
+ ICRC errors and on cases where a device is not able to complete a
+ command. Combined with the fact that MWDMA and PIO transfer errors
+ aren't allowed to use ICRC bit up to ATA/ATAPI-7, it seems to imply
+ that ABRT bit alone could indicate transfer errors.
+
+ However, ATA/ATAPI-8 draft revision 1f removes the part that ICRC
+ errors can turn on ABRT. So, this is kind of gray area. Some
+ heuristics are needed here.
+
+ATA/ATAPI device errors can be further categorized as follows.
+
+Media errors
+ This is indicated by UNC bit in the ERROR register. ATA devices
+ reports UNC error only after certain number of retries cannot
+ recover the data, so there's nothing much else to do other than
+ notifying upper layer.
+
+ READ and WRITE commands report CHS or LBA of the first failed sector
+ but ATA/ATAPI standard specifies that the amount of transferred data
+ on error completion is indeterminate, so we cannot assume that
+ sectors preceding the failed sector have been transferred and thus
+ cannot complete those sectors successfully as SCSI does.
+
+Media changed / media change requested error
+ <<TODO: fill here>>
+
+Address error
+ This is indicated by IDNF bit in the ERROR register. Report to upper
+ layer.
+
+Other errors
+ This can be invalid command or parameter indicated by ABRT ERROR bit
+ or some other error condition. Note that ABRT bit can indicate a lot
+ of things including ICRC and Address errors. Heuristics needed.
+
+Depending on commands, not all STATUS/ERROR bits are applicable. These
+non-applicable bits are marked with "na" in the output descriptions but
+up to ATA/ATAPI-7 no definition of "na" can be found. However,
+ATA/ATAPI-8 draft revision 1f describes "N/A" as follows.
+
+ 3.2.3.3a N/A
+ A keyword the indicates a field has no defined value in this
+ standard and should not be checked by the host or device. N/A
+ fields should be cleared to zero.
+
+So, it seems reasonable to assume that "na" bits are cleared to zero by
+devices and thus need no explicit masking.
+
+ATAPI device CHECK CONDITION
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+ATAPI device CHECK CONDITION error is indicated by set CHK bit (ERR bit)
+in the STATUS register after the last byte of CDB is transferred for a
+PACKET command. For this kind of errors, sense data should be acquired
+to gather information regarding the errors. REQUEST SENSE packet command
+should be used to acquire sense data.
+
+Once sense data is acquired, this type of errors can be handled
+similarly to other SCSI errors. Note that sense data may indicate ATA
+bus error (e.g. Sense Key 04h HARDWARE ERROR && ASC/ASCQ 47h/00h SCSI
+PARITY ERROR). In such cases, the error should be considered as an ATA
+bus error and handled according to `ATA bus error <#excatATAbusErr>`__.
+
+ATA device error (NCQ)
+~~~~~~~~~~~~~~~~~~~~~~
+
+NCQ command error is indicated by cleared BSY and set ERR bit during NCQ
+command phase (one or more NCQ commands outstanding). Although STATUS
+and ERROR registers will contain valid values describing the error, READ
+LOG EXT is required to clear the error condition, determine which
+command has failed and acquire more information.
+
+READ LOG EXT Log Page 10h reports which tag has failed and taskfile
+register values describing the error. With this information the failed
+command can be handled as a normal ATA command error as in
+`ATA/ATAPI device error (non-NCQ / non-CHECK CONDITION) <#excatDevErr>`__
+and all other in-flight commands must be retried. Note that this retry
+should not be counted - it's likely that commands retried this way would
+have completed normally if it were not for the failed command.
+
+Note that ATA bus errors can be reported as ATA device NCQ errors. This
+should be handled as described in `ATA bus error <#excatATAbusErr>`__.
+
+If READ LOG EXT Log Page 10h fails or reports NQ, we're thoroughly
+screwed. This condition should be treated according to
+`HSM violation <#excatHSMviolation>`__.
+
+ATA bus error
+~~~~~~~~~~~~~
+
+ATA bus error means that data corruption occurred during transmission
+over ATA bus (SATA or PATA). This type of errors can be indicated by
+
+- ICRC or ABRT error as described in
+ `ATA/ATAPI device error (non-NCQ / non-CHECK CONDITION) <#excatDevErr>`__.
+
+- Controller-specific error completion with error information
+ indicating transmission error.
+
+- On some controllers, command timeout. In this case, there may be a
+ mechanism to determine that the timeout is due to transmission error.
+
+- Unknown/random errors, timeouts and all sorts of weirdities.
+
+As described above, transmission errors can cause wide variety of
+symptoms ranging from device ICRC error to random device lockup, and,
+for many cases, there is no way to tell if an error condition is due to
+transmission error or not; therefore, it's necessary to employ some kind
+of heuristic when dealing with errors and timeouts. For example,
+encountering repetitive ABRT errors for known supported command is
+likely to indicate ATA bus error.
+
+Once it's determined that ATA bus errors have possibly occurred,
+lowering ATA bus transmission speed is one of actions which may
+alleviate the problem. See `Reconfigure transport <#exrecReconf>`__ for
+more information.
+
+PCI bus error
+~~~~~~~~~~~~~
+
+Data corruption or other failures during transmission over PCI (or other
+system bus). For standard BMDMA, this is indicated by Error bit in the
+BMDMA Status register. This type of errors must be logged as it
+indicates something is very wrong with the system. Resetting host
+controller is recommended.
+
+Late completion
+~~~~~~~~~~~~~~~
+
+This occurs when timeout occurs and the timeout handler finds out that
+the timed out command has completed successfully or with error. This is
+usually caused by lost interrupts. This type of errors must be logged.
+Resetting host controller is recommended.
+
+Unknown error (timeout)
+~~~~~~~~~~~~~~~~~~~~~~~
+
+This is when timeout occurs and the command is still processing or the
+host and device are in unknown state. When this occurs, HSM could be in
+any valid or invalid state. To bring the device to known state and make
+it forget about the timed out command, resetting is necessary. The timed
+out command may be retried.
+
+Timeouts can also be caused by transmission errors. Refer to
+`ATA bus error <#excatATAbusErr>`__ for more details.
+
+Hotplug and power management exceptions
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+<<TODO: fill here>>
+
+EH recovery actions
+-------------------
+
+This section discusses several important recovery actions.
+
+Clearing error condition
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Many controllers require its error registers to be cleared by error
+handler. Different controllers may have different requirements.
+
+For SATA, it's strongly recommended to clear at least SError register
+during error handling.
+
+Reset
+~~~~~
+
+During EH, resetting is necessary in the following cases.
+
+- HSM is in unknown or invalid state
+
+- HBA is in unknown or invalid state
+
+- EH needs to make HBA/device forget about in-flight commands
+
+- HBA/device behaves weirdly
+
+Resetting during EH might be a good idea regardless of error condition
+to improve EH robustness. Whether to reset both or either one of HBA and
+device depends on situation but the following scheme is recommended.
+
+- When it's known that HBA is in ready state but ATA/ATAPI device is in
+ unknown state, reset only device.
+
+- If HBA is in unknown state, reset both HBA and device.
+
+HBA resetting is implementation specific. For a controller complying to
+taskfile/BMDMA PCI IDE, stopping active DMA transaction may be
+sufficient iff BMDMA state is the only HBA context. But even mostly
+taskfile/BMDMA PCI IDE complying controllers may have implementation
+specific requirements and mechanism to reset themselves. This must be
+addressed by specific drivers.
+
+OTOH, ATA/ATAPI standard describes in detail ways to reset ATA/ATAPI
+devices.
+
+PATA hardware reset
+ This is hardware initiated device reset signalled with asserted PATA
+ RESET- signal. There is no standard way to initiate hardware reset
+ from software although some hardware provides registers that allow
+ driver to directly tweak the RESET- signal.
+
+Software reset
+ This is achieved by turning CONTROL SRST bit on for at least 5us.
+ Both PATA and SATA support it but, in case of SATA, this may require
+ controller-specific support as the second Register FIS to clear SRST
+ should be transmitted while BSY bit is still set. Note that on PATA,
+ this resets both master and slave devices on a channel.
+
+EXECUTE DEVICE DIAGNOSTIC command
+ Although ATA/ATAPI standard doesn't describe exactly, EDD implies
+ some level of resetting, possibly similar level with software reset.
+ Host-side EDD protocol can be handled with normal command processing
+ and most SATA controllers should be able to handle EDD's just like
+ other commands. As in software reset, EDD affects both devices on a
+ PATA bus.
+
+ Although EDD does reset devices, this doesn't suit error handling as
+ EDD cannot be issued while BSY is set and it's unclear how it will
+ act when device is in unknown/weird state.
+
+ATAPI DEVICE RESET command
+ This is very similar to software reset except that reset can be
+ restricted to the selected device without affecting the other device
+ sharing the cable.
+
+SATA phy reset
+ This is the preferred way of resetting a SATA device. In effect,
+ it's identical to PATA hardware reset. Note that this can be done
+ with the standard SCR Control register. As such, it's usually easier
+ to implement than software reset.
+
+One more thing to consider when resetting devices is that resetting
+clears certain configuration parameters and they need to be set to their
+previous or newly adjusted values after reset.
+
+Parameters affected are.
+
+- CHS set up with INITIALIZE DEVICE PARAMETERS (seldom used)
+
+- Parameters set with SET FEATURES including transfer mode setting
+
+- Block count set with SET MULTIPLE MODE
+
+- Other parameters (SET MAX, MEDIA LOCK...)
+
+ATA/ATAPI standard specifies that some parameters must be maintained
+across hardware or software reset, but doesn't strictly specify all of
+them. Always reconfiguring needed parameters after reset is required for
+robustness. Note that this also applies when resuming from deep sleep
+(power-off).
+
+Also, ATA/ATAPI standard requires that IDENTIFY DEVICE / IDENTIFY PACKET
+DEVICE is issued after any configuration parameter is updated or a
+hardware reset and the result used for further operation. OS driver is
+required to implement revalidation mechanism to support this.
+
+Reconfigure transport
+~~~~~~~~~~~~~~~~~~~~~
+
+For both PATA and SATA, a lot of corners are cut for cheap connectors,
+cables or controllers and it's quite common to see high transmission
+error rate. This can be mitigated by lowering transmission speed.
+
+The following is a possible scheme Jeff Garzik suggested.
+
+ If more than $N (3?) transmission errors happen in 15 minutes,
+
+ - if SATA, decrease SATA PHY speed. if speed cannot be decreased,
+
+ - decrease UDMA xfer speed. if at UDMA0, switch to PIO4,
+
+ - decrease PIO xfer speed. if at PIO3, complain, but continue
+
+ata_piix Internals
+===================
+
+.. kernel-doc:: drivers/ata/ata_piix.c
+ :internal:
+
+sata_sil Internals
+===================
+
+.. kernel-doc:: drivers/ata/sata_sil.c
+ :internal:
+
+Thanks
+======
+
+The bulk of the ATA knowledge comes thanks to long conversations with
+Andre Hedrick (www.linux-ide.org), and long hours pondering the ATA and
+SCSI specifications.
+
+Thanks to Alan Cox for pointing out similarities between SATA and SCSI,
+and in general for motivation to hack on libata.
+
+libata's device detection method, ata_pio_devchk, and in general all
+the early probing was based on extensive study of Hale Landis's
+probe/reset code in his ATADRVR driver (www.ata-atapi.com).
diff --git a/Documentation/driver-api/mailbox.rst b/Documentation/driver-api/mailbox.rst
new file mode 100644
index 0000000000..0ed95009cc
--- /dev/null
+++ b/Documentation/driver-api/mailbox.rst
@@ -0,0 +1,129 @@
+============================
+The Common Mailbox Framework
+============================
+
+:Author: Jassi Brar <jaswinder.singh@linaro.org>
+
+This document aims to help developers write client and controller
+drivers for the API. But before we start, let us note that the
+client (especially) and controller drivers are likely going to be
+very platform specific because the remote firmware is likely to be
+proprietary and implement non-standard protocol. So even if two
+platforms employ, say, PL320 controller, the client drivers can't
+be shared across them. Even the PL320 driver might need to accommodate
+some platform specific quirks. So the API is meant mainly to avoid
+similar copies of code written for each platform. Having said that,
+nothing prevents the remote f/w to also be Linux based and use the
+same api there. However none of that helps us locally because we only
+ever deal at client's protocol level.
+
+Some of the choices made during implementation are the result of this
+peculiarity of this "common" framework.
+
+
+
+Controller Driver (See include/linux/mailbox_controller.h)
+==========================================================
+
+
+Allocate mbox_controller and the array of mbox_chan.
+Populate mbox_chan_ops, except peek_data() all are mandatory.
+The controller driver might know a message has been consumed
+by the remote by getting an IRQ or polling some hardware flag
+or it can never know (the client knows by way of the protocol).
+The method in order of preference is IRQ -> Poll -> None, which
+the controller driver should set via 'txdone_irq' or 'txdone_poll'
+or neither.
+
+
+Client Driver (See include/linux/mailbox_client.h)
+==================================================
+
+
+The client might want to operate in blocking mode (synchronously
+send a message through before returning) or non-blocking/async mode (submit
+a message and a callback function to the API and return immediately).
+
+::
+
+ struct demo_client {
+ struct mbox_client cl;
+ struct mbox_chan *mbox;
+ struct completion c;
+ bool async;
+ /* ... */
+ };
+
+ /*
+ * This is the handler for data received from remote. The behaviour is purely
+ * dependent upon the protocol. This is just an example.
+ */
+ static void message_from_remote(struct mbox_client *cl, void *mssg)
+ {
+ struct demo_client *dc = container_of(cl, struct demo_client, cl);
+ if (dc->async) {
+ if (is_an_ack(mssg)) {
+ /* An ACK to our last sample sent */
+ return; /* Or do something else here */
+ } else { /* A new message from remote */
+ queue_req(mssg);
+ }
+ } else {
+ /* Remote f/w sends only ACK packets on this channel */
+ return;
+ }
+ }
+
+ static void sample_sent(struct mbox_client *cl, void *mssg, int r)
+ {
+ struct demo_client *dc = container_of(cl, struct demo_client, cl);
+ complete(&dc->c);
+ }
+
+ static void client_demo(struct platform_device *pdev)
+ {
+ struct demo_client *dc_sync, *dc_async;
+ /* The controller already knows async_pkt and sync_pkt */
+ struct async_pkt ap;
+ struct sync_pkt sp;
+
+ dc_sync = kzalloc(sizeof(*dc_sync), GFP_KERNEL);
+ dc_async = kzalloc(sizeof(*dc_async), GFP_KERNEL);
+
+ /* Populate non-blocking mode client */
+ dc_async->cl.dev = &pdev->dev;
+ dc_async->cl.rx_callback = message_from_remote;
+ dc_async->cl.tx_done = sample_sent;
+ dc_async->cl.tx_block = false;
+ dc_async->cl.tx_tout = 0; /* doesn't matter here */
+ dc_async->cl.knows_txdone = false; /* depending upon protocol */
+ dc_async->async = true;
+ init_completion(&dc_async->c);
+
+ /* Populate blocking mode client */
+ dc_sync->cl.dev = &pdev->dev;
+ dc_sync->cl.rx_callback = message_from_remote;
+ dc_sync->cl.tx_done = NULL; /* operate in blocking mode */
+ dc_sync->cl.tx_block = true;
+ dc_sync->cl.tx_tout = 500; /* by half a second */
+ dc_sync->cl.knows_txdone = false; /* depending upon protocol */
+ dc_sync->async = false;
+
+ /* ASync mailbox is listed second in 'mboxes' property */
+ dc_async->mbox = mbox_request_channel(&dc_async->cl, 1);
+ /* Populate data packet */
+ /* ap.xxx = 123; etc */
+ /* Send async message to remote */
+ mbox_send_message(dc_async->mbox, &ap);
+
+ /* Sync mailbox is listed first in 'mboxes' property */
+ dc_sync->mbox = mbox_request_channel(&dc_sync->cl, 0);
+ /* Populate data packet */
+ /* sp.abc = 123; etc */
+ /* Send message to remote in blocking mode */
+ mbox_send_message(dc_sync->mbox, &sp);
+ /* At this point 'sp' has been sent */
+
+ /* Now wait for async chan to be done */
+ wait_for_completion(&dc_async->c);
+ }
diff --git a/Documentation/driver-api/md/index.rst b/Documentation/driver-api/md/index.rst
new file mode 100644
index 0000000000..18f54a7d7d
--- /dev/null
+++ b/Documentation/driver-api/md/index.rst
@@ -0,0 +1,12 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+====
+RAID
+====
+
+.. toctree::
+ :maxdepth: 1
+
+ md-cluster
+ raid5-cache
+ raid5-ppl
diff --git a/Documentation/driver-api/md/md-cluster.rst b/Documentation/driver-api/md/md-cluster.rst
new file mode 100644
index 0000000000..e93f35e0e1
--- /dev/null
+++ b/Documentation/driver-api/md/md-cluster.rst
@@ -0,0 +1,385 @@
+==========
+MD Cluster
+==========
+
+The cluster MD is a shared-device RAID for a cluster, it supports
+two levels: raid1 and raid10 (limited support).
+
+
+1. On-disk format
+=================
+
+Separate write-intent-bitmaps are used for each cluster node.
+The bitmaps record all writes that may have been started on that node,
+and may not yet have finished. The on-disk layout is::
+
+ 0 4k 8k 12k
+ -------------------------------------------------------------------
+ | idle | md super | bm super [0] + bits |
+ | bm bits[0, contd] | bm super[1] + bits | bm bits[1, contd] |
+ | bm super[2] + bits | bm bits [2, contd] | bm super[3] + bits |
+ | bm bits [3, contd] | | |
+
+During "normal" functioning we assume the filesystem ensures that only
+one node writes to any given block at a time, so a write request will
+
+ - set the appropriate bit (if not already set)
+ - commit the write to all mirrors
+ - schedule the bit to be cleared after a timeout.
+
+Reads are just handled normally. It is up to the filesystem to ensure
+one node doesn't read from a location where another node (or the same
+node) is writing.
+
+
+2. DLM Locks for management
+===========================
+
+There are three groups of locks for managing the device:
+
+2.1 Bitmap lock resource (bm_lockres)
+-------------------------------------
+
+ The bm_lockres protects individual node bitmaps. They are named in
+ the form bitmap000 for node 1, bitmap001 for node 2 and so on. When a
+ node joins the cluster, it acquires the lock in PW mode and it stays
+ so during the lifetime the node is part of the cluster. The lock
+ resource number is based on the slot number returned by the DLM
+ subsystem. Since DLM starts node count from one and bitmap slots
+ start from zero, one is subtracted from the DLM slot number to arrive
+ at the bitmap slot number.
+
+ The LVB of the bitmap lock for a particular node records the range
+ of sectors that are being re-synced by that node. No other
+ node may write to those sectors. This is used when a new nodes
+ joins the cluster.
+
+2.2 Message passing locks
+-------------------------
+
+ Each node has to communicate with other nodes when starting or ending
+ resync, and for metadata superblock updates. This communication is
+ managed through three locks: "token", "message", and "ack", together
+ with the Lock Value Block (LVB) of one of the "message" lock.
+
+2.3 new-device management
+-------------------------
+
+ A single lock: "no-new-dev" is used to coordinate the addition of
+ new devices - this must be synchronized across the array.
+ Normally all nodes hold a concurrent-read lock on this device.
+
+3. Communication
+================
+
+ Messages can be broadcast to all nodes, and the sender waits for all
+ other nodes to acknowledge the message before proceeding. Only one
+ message can be processed at a time.
+
+3.1 Message Types
+-----------------
+
+ There are six types of messages which are passed:
+
+3.1.1 METADATA_UPDATED
+^^^^^^^^^^^^^^^^^^^^^^
+
+ informs other nodes that the metadata has
+ been updated, and the node must re-read the md superblock. This is
+ performed synchronously. It is primarily used to signal device
+ failure.
+
+3.1.2 RESYNCING
+^^^^^^^^^^^^^^^
+ informs other nodes that a resync is initiated or
+ ended so that each node may suspend or resume the region. Each
+ RESYNCING message identifies a range of the devices that the
+ sending node is about to resync. This overrides any previous
+ notification from that node: only one ranged can be resynced at a
+ time per-node.
+
+3.1.3 NEWDISK
+^^^^^^^^^^^^^
+
+ informs other nodes that a device is being added to
+ the array. Message contains an identifier for that device. See
+ below for further details.
+
+3.1.4 REMOVE
+^^^^^^^^^^^^
+
+ A failed or spare device is being removed from the
+ array. The slot-number of the device is included in the message.
+
+ 3.1.5 RE_ADD:
+
+ A failed device is being re-activated - the assumption
+ is that it has been determined to be working again.
+
+ 3.1.6 BITMAP_NEEDS_SYNC:
+
+ If a node is stopped locally but the bitmap
+ isn't clean, then another node is informed to take the ownership of
+ resync.
+
+3.2 Communication mechanism
+---------------------------
+
+ The DLM LVB is used to communicate within nodes of the cluster. There
+ are three resources used for the purpose:
+
+3.2.1 token
+^^^^^^^^^^^
+ The resource which protects the entire communication
+ system. The node having the token resource is allowed to
+ communicate.
+
+3.2.2 message
+^^^^^^^^^^^^^
+ The lock resource which carries the data to communicate.
+
+3.2.3 ack
+^^^^^^^^^
+
+ The resource, acquiring which means the message has been
+ acknowledged by all nodes in the cluster. The BAST of the resource
+ is used to inform the receiving node that a node wants to
+ communicate.
+
+The algorithm is:
+
+ 1. receive status - all nodes have concurrent-reader lock on "ack"::
+
+ sender receiver receiver
+ "ack":CR "ack":CR "ack":CR
+
+ 2. sender get EX on "token",
+ sender get EX on "message"::
+
+ sender receiver receiver
+ "token":EX "ack":CR "ack":CR
+ "message":EX
+ "ack":CR
+
+ Sender checks that it still needs to send a message. Messages
+ received or other events that happened while waiting for the
+ "token" may have made this message inappropriate or redundant.
+
+ 3. sender writes LVB
+
+ sender down-convert "message" from EX to CW
+
+ sender try to get EX of "ack"
+
+ ::
+
+ [ wait until all receivers have *processed* the "message" ]
+
+ [ triggered by bast of "ack" ]
+ receiver get CR on "message"
+ receiver read LVB
+ receiver processes the message
+ [ wait finish ]
+ receiver releases "ack"
+ receiver tries to get PR on "message"
+
+ sender receiver receiver
+ "token":EX "message":CR "message":CR
+ "message":CW
+ "ack":EX
+
+ 4. triggered by grant of EX on "ack" (indicating all receivers
+ have processed message)
+
+ sender down-converts "ack" from EX to CR
+
+ sender releases "message"
+
+ sender releases "token"
+
+ ::
+
+ receiver upconvert to PR on "message"
+ receiver get CR of "ack"
+ receiver release "message"
+
+ sender receiver receiver
+ "ack":CR "ack":CR "ack":CR
+
+
+4. Handling Failures
+====================
+
+4.1 Node Failure
+----------------
+
+ When a node fails, the DLM informs the cluster with the slot
+ number. The node starts a cluster recovery thread. The cluster
+ recovery thread:
+
+ - acquires the bitmap<number> lock of the failed node
+ - opens the bitmap
+ - reads the bitmap of the failed node
+ - copies the set bitmap to local node
+ - cleans the bitmap of the failed node
+ - releases bitmap<number> lock of the failed node
+ - initiates resync of the bitmap on the current node
+ md_check_recovery is invoked within recover_bitmaps,
+ then md_check_recovery -> metadata_update_start/finish,
+ it will lock the communication by lock_comm.
+ Which means when one node is resyncing it blocks all
+ other nodes from writing anywhere on the array.
+
+ The resync process is the regular md resync. However, in a clustered
+ environment when a resync is performed, it needs to tell other nodes
+ of the areas which are suspended. Before a resync starts, the node
+ send out RESYNCING with the (lo,hi) range of the area which needs to
+ be suspended. Each node maintains a suspend_list, which contains the
+ list of ranges which are currently suspended. On receiving RESYNCING,
+ the node adds the range to the suspend_list. Similarly, when the node
+ performing resync finishes, it sends RESYNCING with an empty range to
+ other nodes and other nodes remove the corresponding entry from the
+ suspend_list.
+
+ A helper function, ->area_resyncing() can be used to check if a
+ particular I/O range should be suspended or not.
+
+4.2 Device Failure
+==================
+
+ Device failures are handled and communicated with the metadata update
+ routine. When a node detects a device failure it does not allow
+ any further writes to that device until the failure has been
+ acknowledged by all other nodes.
+
+5. Adding a new Device
+----------------------
+
+ For adding a new device, it is necessary that all nodes "see" the new
+ device to be added. For this, the following algorithm is used:
+
+ 1. Node 1 issues mdadm --manage /dev/mdX --add /dev/sdYY which issues
+ ioctl(ADD_NEW_DISK with disc.state set to MD_DISK_CLUSTER_ADD)
+ 2. Node 1 sends a NEWDISK message with uuid and slot number
+ 3. Other nodes issue kobject_uevent_env with uuid and slot number
+ (Steps 4,5 could be a udev rule)
+ 4. In userspace, the node searches for the disk, perhaps
+ using blkid -t SUB_UUID=""
+ 5. Other nodes issue either of the following depending on whether
+ the disk was found:
+ ioctl(ADD_NEW_DISK with disc.state set to MD_DISK_CANDIDATE and
+ disc.number set to slot number)
+ ioctl(CLUSTERED_DISK_NACK)
+ 6. Other nodes drop lock on "no-new-devs" (CR) if device is found
+ 7. Node 1 attempts EX lock on "no-new-dev"
+ 8. If node 1 gets the lock, it sends METADATA_UPDATED after
+ unmarking the disk as SpareLocal
+ 9. If not (get "no-new-dev" lock), it fails the operation and sends
+ METADATA_UPDATED.
+ 10. Other nodes get the information whether a disk is added or not
+ by the following METADATA_UPDATED.
+
+6. Module interface
+===================
+
+ There are 17 call-backs which the md core can make to the cluster
+ module. Understanding these can give a good overview of the whole
+ process.
+
+6.1 join(nodes) and leave()
+---------------------------
+
+ These are called when an array is started with a clustered bitmap,
+ and when the array is stopped. join() ensures the cluster is
+ available and initializes the various resources.
+ Only the first 'nodes' nodes in the cluster can use the array.
+
+6.2 slot_number()
+-----------------
+
+ Reports the slot number advised by the cluster infrastructure.
+ Range is from 0 to nodes-1.
+
+6.3 resync_info_update()
+------------------------
+
+ This updates the resync range that is stored in the bitmap lock.
+ The starting point is updated as the resync progresses. The
+ end point is always the end of the array.
+ It does *not* send a RESYNCING message.
+
+6.4 resync_start(), resync_finish()
+-----------------------------------
+
+ These are called when resync/recovery/reshape starts or stops.
+ They update the resyncing range in the bitmap lock and also
+ send a RESYNCING message. resync_start reports the whole
+ array as resyncing, resync_finish reports none of it.
+
+ resync_finish() also sends a BITMAP_NEEDS_SYNC message which
+ allows some other node to take over.
+
+6.5 metadata_update_start(), metadata_update_finish(), metadata_update_cancel()
+-------------------------------------------------------------------------------
+
+ metadata_update_start is used to get exclusive access to
+ the metadata. If a change is still needed once that access is
+ gained, metadata_update_finish() will send a METADATA_UPDATE
+ message to all other nodes, otherwise metadata_update_cancel()
+ can be used to release the lock.
+
+6.6 area_resyncing()
+--------------------
+
+ This combines two elements of functionality.
+
+ Firstly, it will check if any node is currently resyncing
+ anything in a given range of sectors. If any resync is found,
+ then the caller will avoid writing or read-balancing in that
+ range.
+
+ Secondly, while node recovery is happening it reports that
+ all areas are resyncing for READ requests. This avoids races
+ between the cluster-filesystem and the cluster-RAID handling
+ a node failure.
+
+6.7 add_new_disk_start(), add_new_disk_finish(), new_disk_ack()
+---------------------------------------------------------------
+
+ These are used to manage the new-disk protocol described above.
+ When a new device is added, add_new_disk_start() is called before
+ it is bound to the array and, if that succeeds, add_new_disk_finish()
+ is called the device is fully added.
+
+ When a device is added in acknowledgement to a previous
+ request, or when the device is declared "unavailable",
+ new_disk_ack() is called.
+
+6.8 remove_disk()
+-----------------
+
+ This is called when a spare or failed device is removed from
+ the array. It causes a REMOVE message to be send to other nodes.
+
+6.9 gather_bitmaps()
+--------------------
+
+ This sends a RE_ADD message to all other nodes and then
+ gathers bitmap information from all bitmaps. This combined
+ bitmap is then used to recovery the re-added device.
+
+6.10 lock_all_bitmaps() and unlock_all_bitmaps()
+------------------------------------------------
+
+ These are called when change bitmap to none. If a node plans
+ to clear the cluster raid's bitmap, it need to make sure no other
+ nodes are using the raid which is achieved by lock all bitmap
+ locks within the cluster, and also those locks are unlocked
+ accordingly.
+
+7. Unsupported features
+=======================
+
+There are somethings which are not supported by cluster MD yet.
+
+- change array_sectors.
diff --git a/Documentation/driver-api/md/raid5-cache.rst b/Documentation/driver-api/md/raid5-cache.rst
new file mode 100644
index 0000000000..5f947cbc2e
--- /dev/null
+++ b/Documentation/driver-api/md/raid5-cache.rst
@@ -0,0 +1,111 @@
+================
+RAID 4/5/6 cache
+================
+
+Raid 4/5/6 could include an extra disk for data cache besides normal RAID
+disks. The role of RAID disks isn't changed with the cache disk. The cache disk
+caches data to the RAID disks. The cache can be in write-through (supported
+since 4.4) or write-back mode (supported since 4.10). mdadm (supported since
+3.4) has a new option '--write-journal' to create array with cache. Please
+refer to mdadm manual for details. By default (RAID array starts), the cache is
+in write-through mode. A user can switch it to write-back mode by::
+
+ echo "write-back" > /sys/block/md0/md/journal_mode
+
+And switch it back to write-through mode by::
+
+ echo "write-through" > /sys/block/md0/md/journal_mode
+
+In both modes, all writes to the array will hit cache disk first. This means
+the cache disk must be fast and sustainable.
+
+write-through mode
+==================
+
+This mode mainly fixes the 'write hole' issue. For RAID 4/5/6 array, an unclean
+shutdown can cause data in some stripes to not be in consistent state, eg, data
+and parity don't match. The reason is that a stripe write involves several RAID
+disks and it's possible the writes don't hit all RAID disks yet before the
+unclean shutdown. We call an array degraded if it has inconsistent data. MD
+tries to resync the array to bring it back to normal state. But before the
+resync completes, any system crash will expose the chance of real data
+corruption in the RAID array. This problem is called 'write hole'.
+
+The write-through cache will cache all data on cache disk first. After the data
+is safe on the cache disk, the data will be flushed onto RAID disks. The
+two-step write will guarantee MD can recover correct data after unclean
+shutdown even the array is degraded. Thus the cache can close the 'write hole'.
+
+In write-through mode, MD reports IO completion to upper layer (usually
+filesystems) after the data is safe on RAID disks, so cache disk failure
+doesn't cause data loss. Of course cache disk failure means the array is
+exposed to 'write hole' again.
+
+In write-through mode, the cache disk isn't required to be big. Several
+hundreds megabytes are enough.
+
+write-back mode
+===============
+
+write-back mode fixes the 'write hole' issue too, since all write data is
+cached on cache disk. But the main goal of 'write-back' cache is to speed up
+write. If a write crosses all RAID disks of a stripe, we call it full-stripe
+write. For non-full-stripe writes, MD must read old data before the new parity
+can be calculated. These synchronous reads hurt write throughput. Some writes
+which are sequential but not dispatched in the same time will suffer from this
+overhead too. Write-back cache will aggregate the data and flush the data to
+RAID disks only after the data becomes a full stripe write. This will
+completely avoid the overhead, so it's very helpful for some workloads. A
+typical workload which does sequential write followed by fsync is an example.
+
+In write-back mode, MD reports IO completion to upper layer (usually
+filesystems) right after the data hits cache disk. The data is flushed to raid
+disks later after specific conditions met. So cache disk failure will cause
+data loss.
+
+In write-back mode, MD also caches data in memory. The memory cache includes
+the same data stored on cache disk, so a power loss doesn't cause data loss.
+The memory cache size has performance impact for the array. It's recommended
+the size is big. A user can configure the size by::
+
+ echo "2048" > /sys/block/md0/md/stripe_cache_size
+
+Too small cache disk will make the write aggregation less efficient in this
+mode depending on the workloads. It's recommended to use a cache disk with at
+least several gigabytes size in write-back mode.
+
+The implementation
+==================
+
+The write-through and write-back cache use the same disk format. The cache disk
+is organized as a simple write log. The log consists of 'meta data' and 'data'
+pairs. The meta data describes the data. It also includes checksum and sequence
+ID for recovery identification. Data can be IO data and parity data. Data is
+checksummed too. The checksum is stored in the meta data ahead of the data. The
+checksum is an optimization because MD can write meta and data freely without
+worry about the order. MD superblock has a field pointed to the valid meta data
+of log head.
+
+The log implementation is pretty straightforward. The difficult part is the
+order in which MD writes data to cache disk and RAID disks. Specifically, in
+write-through mode, MD calculates parity for IO data, writes both IO data and
+parity to the log, writes the data and parity to RAID disks after the data and
+parity is settled down in log and finally the IO is finished. Read just reads
+from raid disks as usual.
+
+In write-back mode, MD writes IO data to the log and reports IO completion. The
+data is also fully cached in memory at that time, which means read must query
+memory cache. If some conditions are met, MD will flush the data to RAID disks.
+MD will calculate parity for the data and write parity into the log. After this
+is finished, MD will write both data and parity into RAID disks, then MD can
+release the memory cache. The flush conditions could be stripe becomes a full
+stripe write, free cache disk space is low or free in-kernel memory cache space
+is low.
+
+After an unclean shutdown, MD does recovery. MD reads all meta data and data
+from the log. The sequence ID and checksum will help us detect corrupted meta
+data and data. If MD finds a stripe with data and valid parities (1 parity for
+raid4/5 and 2 for raid6), MD will write the data and parities to RAID disks. If
+parities are incompleted, they are discarded. If part of data is corrupted,
+they are discarded too. MD then loads valid data and writes them to RAID disks
+in normal way.
diff --git a/Documentation/driver-api/md/raid5-ppl.rst b/Documentation/driver-api/md/raid5-ppl.rst
new file mode 100644
index 0000000000..357e5515bc
--- /dev/null
+++ b/Documentation/driver-api/md/raid5-ppl.rst
@@ -0,0 +1,47 @@
+==================
+Partial Parity Log
+==================
+
+Partial Parity Log (PPL) is a feature available for RAID5 arrays. The issue
+addressed by PPL is that after a dirty shutdown, parity of a particular stripe
+may become inconsistent with data on other member disks. If the array is also
+in degraded state, there is no way to recalculate parity, because one of the
+disks is missing. This can lead to silent data corruption when rebuilding the
+array or using it is as degraded - data calculated from parity for array blocks
+that have not been touched by a write request during the unclean shutdown can
+be incorrect. Such condition is known as the RAID5 Write Hole. Because of
+this, md by default does not allow starting a dirty degraded array.
+
+Partial parity for a write operation is the XOR of stripe data chunks not
+modified by this write. It is just enough data needed for recovering from the
+write hole. XORing partial parity with the modified chunks produces parity for
+the stripe, consistent with its state before the write operation, regardless of
+which chunk writes have completed. If one of the not modified data disks of
+this stripe is missing, this updated parity can be used to recover its
+contents. PPL recovery is also performed when starting an array after an
+unclean shutdown and all disks are available, eliminating the need to resync
+the array. Because of this, using write-intent bitmap and PPL together is not
+supported.
+
+When handling a write request PPL writes partial parity before new data and
+parity are dispatched to disks. PPL is a distributed log - it is stored on
+array member drives in the metadata area, on the parity drive of a particular
+stripe. It does not require a dedicated journaling drive. Write performance is
+reduced by up to 30%-40% but it scales with the number of drives in the array
+and the journaling drive does not become a bottleneck or a single point of
+failure.
+
+Unlike raid5-cache, the other solution in md for closing the write hole, PPL is
+not a true journal. It does not protect from losing in-flight data, only from
+silent data corruption. If a dirty disk of a stripe is lost, no PPL recovery is
+performed for this stripe (parity is not updated). So it is possible to have
+arbitrary data in the written part of a stripe if that disk is lost. In such
+case the behavior is the same as in plain raid5.
+
+PPL is available for md version-1 metadata and external (specifically IMSM)
+metadata arrays. It can be enabled using mdadm option --consistency-policy=ppl.
+
+There is a limitation of maximum 64 disks in the array for PPL. It allows to
+keep data structures and implementation simple. RAID5 arrays with so many disks
+are not likely due to high risk of multiple disks failure. Such restriction
+should not be a real life limitation.
diff --git a/Documentation/driver-api/media/camera-sensor.rst b/Documentation/driver-api/media/camera-sensor.rst
new file mode 100644
index 0000000000..93f4f2536c
--- /dev/null
+++ b/Documentation/driver-api/media/camera-sensor.rst
@@ -0,0 +1,175 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Writing camera sensor drivers
+=============================
+
+CSI-2 and parallel (BT.601 and BT.656) busses
+---------------------------------------------
+
+Please see :ref:`transmitter-receiver`.
+
+Handling clocks
+---------------
+
+Camera sensors have an internal clock tree including a PLL and a number of
+divisors. The clock tree is generally configured by the driver based on a few
+input parameters that are specific to the hardware:: the external clock frequency
+and the link frequency. The two parameters generally are obtained from system
+firmware. **No other frequencies should be used in any circumstances.**
+
+The reason why the clock frequencies are so important is that the clock signals
+come out of the SoC, and in many cases a specific frequency is designed to be
+used in the system. Using another frequency may cause harmful effects
+elsewhere. Therefore only the pre-determined frequencies are configurable by the
+user.
+
+ACPI
+~~~~
+
+Read the ``clock-frequency`` _DSD property to denote the frequency. The driver
+can rely on this frequency being used.
+
+Devicetree
+~~~~~~~~~~
+
+The currently preferred way to achieve this is using ``assigned-clocks``,
+``assigned-clock-parents`` and ``assigned-clock-rates`` properties. See
+``Documentation/devicetree/bindings/clock/clock-bindings.txt`` for more
+information. The driver then gets the frequency using ``clk_get_rate()``.
+
+This approach has the drawback that there's no guarantee that the frequency
+hasn't been modified directly or indirectly by another driver, or supported by
+the board's clock tree to begin with. Changes to the Common Clock Framework API
+are required to ensure reliability.
+
+Frame size
+----------
+
+There are two distinct ways to configure the frame size produced by camera
+sensors.
+
+Freely configurable camera sensor drivers
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Freely configurable camera sensor drivers expose the device's internal
+processing pipeline as one or more sub-devices with different cropping and
+scaling configurations. The output size of the device is the result of a series
+of cropping and scaling operations from the device's pixel array's size.
+
+An example of such a driver is the CCS driver (see ``drivers/media/i2c/ccs``).
+
+Register list based drivers
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Register list based drivers generally, instead of able to configure the device
+they control based on user requests, are limited to a number of preset
+configurations that combine a number of different parameters that on hardware
+level are independent. How a driver picks such configuration is based on the
+format set on a source pad at the end of the device's internal pipeline.
+
+Most sensor drivers are implemented this way, see e.g.
+``drivers/media/i2c/imx319.c`` for an example.
+
+Frame interval configuration
+----------------------------
+
+There are two different methods for obtaining possibilities for different frame
+intervals as well as configuring the frame interval. Which one to implement
+depends on the type of the device.
+
+Raw camera sensors
+~~~~~~~~~~~~~~~~~~
+
+Instead of a high level parameter such as frame interval, the frame interval is
+a result of the configuration of a number of camera sensor implementation
+specific parameters. Luckily, these parameters tend to be the same for more or
+less all modern raw camera sensors.
+
+The frame interval is calculated using the following equation::
+
+ frame interval = (analogue crop width + horizontal blanking) *
+ (analogue crop height + vertical blanking) / pixel rate
+
+The formula is bus independent and is applicable for raw timing parameters on
+large variety of devices beyond camera sensors. Devices that have no analogue
+crop, use the full source image size, i.e. pixel array size.
+
+Horizontal and vertical blanking are specified by ``V4L2_CID_HBLANK`` and
+``V4L2_CID_VBLANK``, respectively. The unit of the ``V4L2_CID_HBLANK`` control
+is pixels and the unit of the ``V4L2_CID_VBLANK`` is lines. The pixel rate in
+the sensor's **pixel array** is specified by ``V4L2_CID_PIXEL_RATE`` in the same
+sub-device. The unit of that control is pixels per second.
+
+Register list based drivers need to implement read-only sub-device nodes for the
+purpose. Devices that are not register list based need these to configure the
+device's internal processing pipeline.
+
+The first entity in the linear pipeline is the pixel array. The pixel array may
+be followed by other entities that are there to allow configuring binning,
+skipping, scaling or digital crop :ref:`v4l2-subdev-selections`.
+
+USB cameras etc. devices
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+USB video class hardware, as well as many cameras offering a similar higher
+level interface natively, generally use the concept of frame interval (or frame
+rate) on device level in firmware or hardware. This means lower level controls
+implemented by raw cameras may not be used on uAPI (or even kAPI) to control the
+frame interval on these devices.
+
+Power management
+----------------
+
+Always use runtime PM to manage the power states of your device. Camera sensor
+drivers are in no way special in this respect: they are responsible for
+controlling the power state of the device they otherwise control as well. In
+general, the device must be powered on at least when its registers are being
+accessed and when it is streaming.
+
+Existing camera sensor drivers may rely on the old
+struct v4l2_subdev_core_ops->s_power() callback for bridge or ISP drivers to
+manage their power state. This is however **deprecated**. If you feel you need
+to begin calling an s_power from an ISP or a bridge driver, instead please add
+runtime PM support to the sensor driver you are using. Likewise, new drivers
+should not use s_power.
+
+Please see examples in e.g. ``drivers/media/i2c/ov8856.c`` and
+``drivers/media/i2c/ccs/ccs-core.c``. The two drivers work in both ACPI
+and DT based systems.
+
+Control framework
+~~~~~~~~~~~~~~~~~
+
+``v4l2_ctrl_handler_setup()`` function may not be used in the device's runtime
+PM ``runtime_resume`` callback, as it has no way to figure out the power state
+of the device. This is because the power state of the device is only changed
+after the power state transition has taken place. The ``s_ctrl`` callback can be
+used to obtain device's power state after the power state transition:
+
+.. c:function:: int pm_runtime_get_if_in_use(struct device *dev);
+
+The function returns a non-zero value if it succeeded getting the power count or
+runtime PM was disabled, in either of which cases the driver may proceed to
+access the device.
+
+Rotation, orientation and flipping
+----------------------------------
+
+Some systems have the camera sensor mounted upside down compared to its natural
+mounting rotation. In such cases, drivers shall expose the information to
+userspace with the :ref:`V4L2_CID_CAMERA_SENSOR_ROTATION
+<v4l2-camera-sensor-rotation>` control.
+
+Sensor drivers shall also report the sensor's mounting orientation with the
+:ref:`V4L2_CID_CAMERA_SENSOR_ORIENTATION <v4l2-camera-sensor-orientation>`.
+
+Use ``v4l2_fwnode_device_parse()`` to obtain rotation and orientation
+information from system firmware and ``v4l2_ctrl_new_fwnode_properties()`` to
+register the appropriate controls.
+
+Sensor drivers that have any vertical or horizontal flips embedded in the
+register programming sequences shall initialize the V4L2_CID_HFLIP and
+V4L2_CID_VFLIP controls with the values programmed by the register sequences.
+The default values of these controls shall be 0 (disabled). Especially these
+controls shall not be inverted, independently of the sensor's mounting
+rotation.
diff --git a/Documentation/driver-api/media/cec-core.rst b/Documentation/driver-api/media/cec-core.rst
new file mode 100644
index 0000000000..f1ffdec388
--- /dev/null
+++ b/Documentation/driver-api/media/cec-core.rst
@@ -0,0 +1,502 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+CEC Kernel Support
+==================
+
+The CEC framework provides a unified kernel interface for use with HDMI CEC
+hardware. It is designed to handle a multiple types of hardware (receivers,
+transmitters, USB dongles). The framework also gives the option to decide
+what to do in the kernel driver and what should be handled by userspace
+applications. In addition it integrates the remote control passthrough
+feature into the kernel's remote control framework.
+
+
+The CEC Protocol
+----------------
+
+The CEC protocol enables consumer electronic devices to communicate with each
+other through the HDMI connection. The protocol uses logical addresses in the
+communication. The logical address is strictly connected with the functionality
+provided by the device. The TV acting as the communication hub is always
+assigned address 0. The physical address is determined by the physical
+connection between devices.
+
+The CEC framework described here is up to date with the CEC 2.0 specification.
+It is documented in the HDMI 1.4 specification with the new 2.0 bits documented
+in the HDMI 2.0 specification. But for most of the features the freely available
+HDMI 1.3a specification is sufficient:
+
+https://www.hdmi.org/spec/index
+
+
+CEC Adapter Interface
+---------------------
+
+The struct cec_adapter represents the CEC adapter hardware. It is created by
+calling cec_allocate_adapter() and deleted by calling cec_delete_adapter():
+
+.. c:function::
+ struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops, \
+ void *priv, const char *name, \
+ u32 caps, u8 available_las);
+
+.. c:function::
+ void cec_delete_adapter(struct cec_adapter *adap);
+
+To create an adapter you need to pass the following information:
+
+ops:
+ adapter operations which are called by the CEC framework and that you
+ have to implement.
+
+priv:
+ will be stored in adap->priv and can be used by the adapter ops.
+ Use cec_get_drvdata(adap) to get the priv pointer.
+
+name:
+ the name of the CEC adapter. Note: this name will be copied.
+
+caps:
+ capabilities of the CEC adapter. These capabilities determine the
+ capabilities of the hardware and which parts are to be handled
+ by userspace and which parts are handled by kernelspace. The
+ capabilities are returned by CEC_ADAP_G_CAPS.
+
+available_las:
+ the number of simultaneous logical addresses that this
+ adapter can handle. Must be 1 <= available_las <= CEC_MAX_LOG_ADDRS.
+
+To obtain the priv pointer use this helper function:
+
+.. c:function::
+ void *cec_get_drvdata(const struct cec_adapter *adap);
+
+To register the /dev/cecX device node and the remote control device (if
+CEC_CAP_RC is set) you call:
+
+.. c:function::
+ int cec_register_adapter(struct cec_adapter *adap, \
+ struct device *parent);
+
+where parent is the parent device.
+
+To unregister the devices call:
+
+.. c:function::
+ void cec_unregister_adapter(struct cec_adapter *adap);
+
+Note: if cec_register_adapter() fails, then call cec_delete_adapter() to
+clean up. But if cec_register_adapter() succeeded, then only call
+cec_unregister_adapter() to clean up, never cec_delete_adapter(). The
+unregister function will delete the adapter automatically once the last user
+of that /dev/cecX device has closed its file handle.
+
+
+Implementing the Low-Level CEC Adapter
+--------------------------------------
+
+The following low-level adapter operations have to be implemented in
+your driver:
+
+.. c:struct:: cec_adap_ops
+
+.. code-block:: none
+
+ struct cec_adap_ops
+ {
+ /* Low-level callbacks */
+ int (*adap_enable)(struct cec_adapter *adap, bool enable);
+ int (*adap_monitor_all_enable)(struct cec_adapter *adap, bool enable);
+ int (*adap_monitor_pin_enable)(struct cec_adapter *adap, bool enable);
+ int (*adap_log_addr)(struct cec_adapter *adap, u8 logical_addr);
+ void (*adap_unconfigured)(struct cec_adapter *adap);
+ int (*adap_transmit)(struct cec_adapter *adap, u8 attempts,
+ u32 signal_free_time, struct cec_msg *msg);
+ void (*adap_nb_transmit_canceled)(struct cec_adapter *adap,
+ const struct cec_msg *msg);
+ void (*adap_status)(struct cec_adapter *adap, struct seq_file *file);
+ void (*adap_free)(struct cec_adapter *adap);
+
+ /* Error injection callbacks */
+ ...
+
+ /* High-level callback */
+ ...
+ };
+
+These low-level ops deal with various aspects of controlling the CEC adapter
+hardware. They are all called with the mutex adap->lock held.
+
+
+To enable/disable the hardware::
+
+ int (*adap_enable)(struct cec_adapter *adap, bool enable);
+
+This callback enables or disables the CEC hardware. Enabling the CEC hardware
+means powering it up in a state where no logical addresses are claimed. The
+physical address will always be valid if CEC_CAP_NEEDS_HPD is set. If that
+capability is not set, then the physical address can change while the CEC
+hardware is enabled. CEC drivers should not set CEC_CAP_NEEDS_HPD unless
+the hardware design requires that as this will make it impossible to wake
+up displays that pull the HPD low when in standby mode. The initial
+state of the CEC adapter after calling cec_allocate_adapter() is disabled.
+
+Note that adap_enable must return 0 if enable is false.
+
+
+To enable/disable the 'monitor all' mode::
+
+ int (*adap_monitor_all_enable)(struct cec_adapter *adap, bool enable);
+
+If enabled, then the adapter should be put in a mode to also monitor messages
+that are not for us. Not all hardware supports this and this function is only
+called if the CEC_CAP_MONITOR_ALL capability is set. This callback is optional
+(some hardware may always be in 'monitor all' mode).
+
+Note that adap_monitor_all_enable must return 0 if enable is false.
+
+
+To enable/disable the 'monitor pin' mode::
+
+ int (*adap_monitor_pin_enable)(struct cec_adapter *adap, bool enable);
+
+If enabled, then the adapter should be put in a mode to also monitor CEC pin
+changes. Not all hardware supports this and this function is only called if
+the CEC_CAP_MONITOR_PIN capability is set. This callback is optional
+(some hardware may always be in 'monitor pin' mode).
+
+Note that adap_monitor_pin_enable must return 0 if enable is false.
+
+
+To program a new logical address::
+
+ int (*adap_log_addr)(struct cec_adapter *adap, u8 logical_addr);
+
+If logical_addr == CEC_LOG_ADDR_INVALID then all programmed logical addresses
+are to be erased. Otherwise the given logical address should be programmed.
+If the maximum number of available logical addresses is exceeded, then it
+should return -ENXIO. Once a logical address is programmed the CEC hardware
+can receive directed messages to that address.
+
+Note that adap_log_addr must return 0 if logical_addr is CEC_LOG_ADDR_INVALID.
+
+
+Called when the adapter is unconfigured::
+
+ void (*adap_unconfigured)(struct cec_adapter *adap);
+
+The adapter is unconfigured. If the driver has to take specific actions after
+unconfiguration, then that can be done through this optional callback.
+
+
+To transmit a new message::
+
+ int (*adap_transmit)(struct cec_adapter *adap, u8 attempts,
+ u32 signal_free_time, struct cec_msg *msg);
+
+This transmits a new message. The attempts argument is the suggested number of
+attempts for the transmit.
+
+The signal_free_time is the number of data bit periods that the adapter should
+wait when the line is free before attempting to send a message. This value
+depends on whether this transmit is a retry, a message from a new initiator or
+a new message for the same initiator. Most hardware will handle this
+automatically, but in some cases this information is needed.
+
+The CEC_FREE_TIME_TO_USEC macro can be used to convert signal_free_time to
+microseconds (one data bit period is 2.4 ms).
+
+
+To pass on the result of a canceled non-blocking transmit::
+
+ void (*adap_nb_transmit_canceled)(struct cec_adapter *adap,
+ const struct cec_msg *msg);
+
+This optional callback can be used to obtain the result of a canceled
+non-blocking transmit with sequence number msg->sequence. This is
+called if the transmit was aborted, the transmit timed out (i.e. the
+hardware never signaled that the transmit finished), or the transmit
+was successful, but the wait for the expected reply was either aborted
+or it timed out.
+
+
+To log the current CEC hardware status::
+
+ void (*adap_status)(struct cec_adapter *adap, struct seq_file *file);
+
+This optional callback can be used to show the status of the CEC hardware.
+The status is available through debugfs: cat /sys/kernel/debug/cec/cecX/status
+
+To free any resources when the adapter is deleted::
+
+ void (*adap_free)(struct cec_adapter *adap);
+
+This optional callback can be used to free any resources that might have been
+allocated by the driver. It's called from cec_delete_adapter.
+
+
+Your adapter driver will also have to react to events (typically interrupt
+driven) by calling into the framework in the following situations:
+
+When a transmit finished (successfully or otherwise)::
+
+ void cec_transmit_done(struct cec_adapter *adap, u8 status,
+ u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt,
+ u8 error_cnt);
+
+or::
+
+ void cec_transmit_attempt_done(struct cec_adapter *adap, u8 status);
+
+The status can be one of:
+
+CEC_TX_STATUS_OK:
+ the transmit was successful.
+
+CEC_TX_STATUS_ARB_LOST:
+ arbitration was lost: another CEC initiator
+ took control of the CEC line and you lost the arbitration.
+
+CEC_TX_STATUS_NACK:
+ the message was nacked (for a directed message) or
+ acked (for a broadcast message). A retransmission is needed.
+
+CEC_TX_STATUS_LOW_DRIVE:
+ low drive was detected on the CEC bus. This indicates that
+ a follower detected an error on the bus and requested a
+ retransmission.
+
+CEC_TX_STATUS_ERROR:
+ some unspecified error occurred: this can be one of ARB_LOST
+ or LOW_DRIVE if the hardware cannot differentiate or something
+ else entirely. Some hardware only supports OK and FAIL as the
+ result of a transmit, i.e. there is no way to differentiate
+ between the different possible errors. In that case map FAIL
+ to CEC_TX_STATUS_NACK and not to CEC_TX_STATUS_ERROR.
+
+CEC_TX_STATUS_MAX_RETRIES:
+ could not transmit the message after trying multiple times.
+ Should only be set by the driver if it has hardware support for
+ retrying messages. If set, then the framework assumes that it
+ doesn't have to make another attempt to transmit the message
+ since the hardware did that already.
+
+The hardware must be able to differentiate between OK, NACK and 'something
+else'.
+
+The \*_cnt arguments are the number of error conditions that were seen.
+This may be 0 if no information is available. Drivers that do not support
+hardware retry can just set the counter corresponding to the transmit error
+to 1, if the hardware does support retry then either set these counters to
+0 if the hardware provides no feedback of which errors occurred and how many
+times, or fill in the correct values as reported by the hardware.
+
+Be aware that calling these functions can immediately start a new transmit
+if there is one pending in the queue. So make sure that the hardware is in
+a state where new transmits can be started *before* calling these functions.
+
+The cec_transmit_attempt_done() function is a helper for cases where the
+hardware never retries, so the transmit is always for just a single
+attempt. It will call cec_transmit_done() in turn, filling in 1 for the
+count argument corresponding to the status. Or all 0 if the status was OK.
+
+When a CEC message was received:
+
+.. c:function::
+ void cec_received_msg(struct cec_adapter *adap, struct cec_msg *msg);
+
+Speaks for itself.
+
+Implementing the interrupt handler
+----------------------------------
+
+Typically the CEC hardware provides interrupts that signal when a transmit
+finished and whether it was successful or not, and it provides and interrupt
+when a CEC message was received.
+
+The CEC driver should always process the transmit interrupts first before
+handling the receive interrupt. The framework expects to see the cec_transmit_done
+call before the cec_received_msg call, otherwise it can get confused if the
+received message was in reply to the transmitted message.
+
+Optional: Implementing Error Injection Support
+----------------------------------------------
+
+If the CEC adapter supports Error Injection functionality, then that can
+be exposed through the Error Injection callbacks:
+
+.. code-block:: none
+
+ struct cec_adap_ops {
+ /* Low-level callbacks */
+ ...
+
+ /* Error injection callbacks */
+ int (*error_inj_show)(struct cec_adapter *adap, struct seq_file *sf);
+ bool (*error_inj_parse_line)(struct cec_adapter *adap, char *line);
+
+ /* High-level CEC message callback */
+ ...
+ };
+
+If both callbacks are set, then an ``error-inj`` file will appear in debugfs.
+The basic syntax is as follows:
+
+Leading spaces/tabs are ignored. If the next character is a ``#`` or the end of the
+line was reached, then the whole line is ignored. Otherwise a command is expected.
+
+This basic parsing is done in the CEC Framework. It is up to the driver to decide
+what commands to implement. The only requirement is that the command ``clear`` without
+any arguments must be implemented and that it will remove all current error injection
+commands.
+
+This ensures that you can always do ``echo clear >error-inj`` to clear any error
+injections without having to know the details of the driver-specific commands.
+
+Note that the output of ``error-inj`` shall be valid as input to ``error-inj``.
+So this must work:
+
+.. code-block:: none
+
+ $ cat error-inj >einj.txt
+ $ cat einj.txt >error-inj
+
+The first callback is called when this file is read and it should show the
+current error injection state::
+
+ int (*error_inj_show)(struct cec_adapter *adap, struct seq_file *sf);
+
+It is recommended that it starts with a comment block with basic usage
+information. It returns 0 for success and an error otherwise.
+
+The second callback will parse commands written to the ``error-inj`` file::
+
+ bool (*error_inj_parse_line)(struct cec_adapter *adap, char *line);
+
+The ``line`` argument points to the start of the command. Any leading
+spaces or tabs have already been skipped. It is a single line only (so there
+are no embedded newlines) and it is 0-terminated. The callback is free to
+modify the contents of the buffer. It is only called for lines containing a
+command, so this callback is never called for empty lines or comment lines.
+
+Return true if the command was valid or false if there were syntax errors.
+
+Implementing the High-Level CEC Adapter
+---------------------------------------
+
+The low-level operations drive the hardware, the high-level operations are
+CEC protocol driven. The high-level callbacks are called without the adap->lock
+mutex being held. The following high-level callbacks are available:
+
+.. code-block:: none
+
+ struct cec_adap_ops {
+ /* Low-level callbacks */
+ ...
+
+ /* Error injection callbacks */
+ ...
+
+ /* High-level CEC message callback */
+ void (*configured)(struct cec_adapter *adap);
+ int (*received)(struct cec_adapter *adap, struct cec_msg *msg);
+ };
+
+Called when the adapter is configured::
+
+ void (*configured)(struct cec_adapter *adap);
+
+The adapter is fully configured, i.e. all logical addresses have been
+successfully claimed. If the driver has to take specific actions after
+configuration, then that can be done through this optional callback.
+
+
+The received() callback allows the driver to optionally handle a newly
+received CEC message::
+
+ int (*received)(struct cec_adapter *adap, struct cec_msg *msg);
+
+If the driver wants to process a CEC message, then it can implement this
+callback. If it doesn't want to handle this message, then it should return
+-ENOMSG, otherwise the CEC framework assumes it processed this message and
+it will not do anything with it.
+
+
+CEC framework functions
+-----------------------
+
+CEC Adapter drivers can call the following CEC framework functions:
+
+.. c:function::
+ int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg, \
+ bool block);
+
+Transmit a CEC message. If block is true, then wait until the message has been
+transmitted, otherwise just queue it and return.
+
+.. c:function::
+ void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block);
+
+Change the physical address. This function will set adap->phys_addr and
+send an event if it has changed. If cec_s_log_addrs() has been called and
+the physical address has become valid, then the CEC framework will start
+claiming the logical addresses. If block is true, then this function won't
+return until this process has finished.
+
+When the physical address is set to a valid value the CEC adapter will
+be enabled (see the adap_enable op). When it is set to CEC_PHYS_ADDR_INVALID,
+then the CEC adapter will be disabled. If you change a valid physical address
+to another valid physical address, then this function will first set the
+address to CEC_PHYS_ADDR_INVALID before enabling the new physical address.
+
+.. c:function::
+ void cec_s_phys_addr_from_edid(struct cec_adapter *adap, \
+ const struct edid *edid);
+
+A helper function that extracts the physical address from the edid struct
+and calls cec_s_phys_addr() with that address, or CEC_PHYS_ADDR_INVALID
+if the EDID did not contain a physical address or edid was a NULL pointer.
+
+.. c:function::
+ int cec_s_log_addrs(struct cec_adapter *adap, \
+ struct cec_log_addrs *log_addrs, bool block);
+
+Claim the CEC logical addresses. Should never be called if CEC_CAP_LOG_ADDRS
+is set. If block is true, then wait until the logical addresses have been
+claimed, otherwise just queue it and return. To unconfigure all logical
+addresses call this function with log_addrs set to NULL or with
+log_addrs->num_log_addrs set to 0. The block argument is ignored when
+unconfiguring. This function will just return if the physical address is
+invalid. Once the physical address becomes valid, then the framework will
+attempt to claim these logical addresses.
+
+CEC Pin framework
+-----------------
+
+Most CEC hardware operates on full CEC messages where the software provides
+the message and the hardware handles the low-level CEC protocol. But some
+hardware only drives the CEC pin and software has to handle the low-level
+CEC protocol. The CEC pin framework was created to handle such devices.
+
+Note that due to the close-to-realtime requirements it can never be guaranteed
+to work 100%. This framework uses highres timers internally, but if a
+timer goes off too late by more than 300 microseconds wrong results can
+occur. In reality it appears to be fairly reliable.
+
+One advantage of this low-level implementation is that it can be used as
+a cheap CEC analyser, especially if interrupts can be used to detect
+CEC pin transitions from low to high or vice versa.
+
+.. kernel-doc:: include/media/cec-pin.h
+
+CEC Notifier framework
+----------------------
+
+Most drm HDMI implementations have an integrated CEC implementation and no
+notifier support is needed. But some have independent CEC implementations
+that have their own driver. This could be an IP block for an SoC or a
+completely separate chip that deals with the CEC pin. For those cases a
+drm driver can install a notifier and use the notifier to inform the
+CEC driver about changes in the physical address.
+
+.. kernel-doc:: include/media/cec-notifier.h
diff --git a/Documentation/driver-api/media/drivers/bttv-devel.rst b/Documentation/driver-api/media/drivers/bttv-devel.rst
new file mode 100644
index 0000000000..0885a04563
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/bttv-devel.rst
@@ -0,0 +1,116 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+The bttv driver
+===============
+
+bttv and sound mini howto
+-------------------------
+
+There are a lot of different bt848/849/878/879 based boards available.
+Making video work often is not a big deal, because this is handled
+completely by the bt8xx chip, which is common on all boards. But
+sound is handled in slightly different ways on each board.
+
+To handle the grabber boards correctly, there is a array tvcards[] in
+bttv-cards.c, which holds the information required for each board.
+Sound will work only, if the correct entry is used (for video it often
+makes no difference). The bttv driver prints a line to the kernel
+log, telling which card type is used. Like this one::
+
+ bttv0: model: BT848(Hauppauge old) [autodetected]
+
+You should verify this is correct. If it isn't, you have to pass the
+correct board type as insmod argument, ``insmod bttv card=2`` for
+example. The file Documentation/admin-guide/media/bttv-cardlist.rst has a list
+of valid arguments for card.
+
+If your card isn't listed there, you might check the source code for
+new entries which are not listed yet. If there isn't one for your
+card, you can check if one of the existing entries does work for you
+(just trial and error...).
+
+Some boards have an extra processor for sound to do stereo decoding
+and other nice features. The msp34xx chips are used by Hauppauge for
+example. If your board has one, you might have to load a helper
+module like ``msp3400`` to make sound work. If there isn't one for the
+chip used on your board: Bad luck. Start writing a new one. Well,
+you might want to check the video4linux mailing list archive first...
+
+Of course you need a correctly installed soundcard unless you have the
+speakers connected directly to the grabber board. Hint: check the
+mixer settings too. ALSA for example has everything muted by default.
+
+
+How sound works in detail
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Still doesn't work? Looks like some driver hacking is required.
+Below is a do-it-yourself description for you.
+
+The bt8xx chips have 32 general purpose pins, and registers to control
+these pins. One register is the output enable register
+(``BT848_GPIO_OUT_EN``), it says which pins are actively driven by the
+bt848 chip. Another one is the data register (``BT848_GPIO_DATA``), where
+you can get/set the status if these pins. They can be used for input
+and output.
+
+Most grabber board vendors use these pins to control an external chip
+which does the sound routing. But every board is a little different.
+These pins are also used by some companies to drive remote control
+receiver chips. Some boards use the i2c bus instead of the gpio pins
+to connect the mux chip.
+
+As mentioned above, there is a array which holds the required
+information for each known board. You basically have to create a new
+line for your board. The important fields are these two::
+
+ struct tvcard
+ {
+ [ ... ]
+ u32 gpiomask;
+ u32 audiomux[6]; /* Tuner, Radio, external, internal, mute, stereo */
+ };
+
+gpiomask specifies which pins are used to control the audio mux chip.
+The corresponding bits in the output enable register
+(``BT848_GPIO_OUT_EN``) will be set as these pins must be driven by the
+bt848 chip.
+
+The ``audiomux[]`` array holds the data values for the different inputs
+(i.e. which pins must be high/low for tuner/mute/...). This will be
+written to the data register (``BT848_GPIO_DATA``) to switch the audio
+mux.
+
+
+What you have to do is figure out the correct values for gpiomask and
+the audiomux array. If you have Windows and the drivers four your
+card installed, you might to check out if you can read these registers
+values used by the windows driver. A tool to do this is available
+from http://btwincap.sourceforge.net/download.html.
+
+You might also dig around in the ``*.ini`` files of the Windows applications.
+You can have a look at the board to see which of the gpio pins are
+connected at all and then start trial-and-error ...
+
+
+Starting with release 0.7.41 bttv has a number of insmod options to
+make the gpio debugging easier:
+
+ ================= ==============================================
+ bttv_gpio=0/1 enable/disable gpio debug messages
+ gpiomask=n set the gpiomask value
+ audiomux=i,j,... set the values of the audiomux array
+ audioall=a set the values of the audiomux array (one
+ value for all array elements, useful to check
+ out which effect the particular value has).
+ ================= ==============================================
+
+The messages printed with ``bttv_gpio=1`` look like this::
+
+ bttv0: gpio: en=00000027, out=00000024 in=00ffffd8 [audio: off]
+
+ en = output _en_able register (BT848_GPIO_OUT_EN)
+ out = _out_put bits of the data register (BT848_GPIO_DATA),
+ i.e. BT848_GPIO_DATA & BT848_GPIO_OUT_EN
+ in = _in_put bits of the data register,
+ i.e. BT848_GPIO_DATA & ~BT848_GPIO_OUT_EN
diff --git a/Documentation/driver-api/media/drivers/ccs/ccs-regs.asc b/Documentation/driver-api/media/drivers/ccs/ccs-regs.asc
new file mode 100644
index 0000000000..bbf9213c33
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/ccs/ccs-regs.asc
@@ -0,0 +1,1041 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause
+# Copyright (C) 2019--2020 Intel Corporation
+
+# register rflags
+# - f field LSB MSB rflags
+# - e enum value # after a field
+# - e enum value [LSB MSB]
+# - b bool bit
+# - l arg name min max elsize [discontig...]
+#
+# rflags
+# 8, 16, 32 register bits (default is 8)
+# v1.1 defined in version 1.1
+# f formula
+# float_ireal iReal or IEEE 754; 32 bits
+# ireal unsigned iReal
+
+# general status registers
+module_model_id 0x0000 16
+module_revision_number_major 0x0002 8
+frame_count 0x0005 8
+pixel_order 0x0006 8
+- e GRBG 0
+- e RGGB 1
+- e BGGR 2
+- e GBRG 3
+MIPI_CCS_version 0x0007 8
+- e v1_0 0x10
+- e v1_1 0x11
+- f major 4 7
+- f minor 0 3
+data_pedestal 0x0008 16
+module_manufacturer_id 0x000e 16
+module_revision_number_minor 0x0010 8
+module_date_year 0x0012 8
+module_date_month 0x0013 8
+module_date_day 0x0014 8
+module_date_phase 0x0015 8
+- f 0 2
+- e ts 0
+- e es 1
+- e cs 2
+- e mp 3
+sensor_model_id 0x0016 16
+sensor_revision_number 0x0018 8
+sensor_firmware_version 0x001a 8
+serial_number 0x001c 32
+sensor_manufacturer_id 0x0020 16
+sensor_revision_number_16 0x0022 16
+
+# frame format description registers
+frame_format_model_type 0x0040 8
+- e 2-byte 1
+- e 4-byte 2
+frame_format_model_subtype 0x0041 8
+- f rows 0 3
+- f columns 4 7
+frame_format_descriptor(n) 0x0042 16 f
+- l n 0 14 2
+- f pixels 0 11
+- f pcode 12 15
+- e embedded 1
+- e dummy_pixel 2
+- e black_pixel 3
+- e dark_pixel 4
+- e visible_pixel 5
+- e manuf_specific_0 8
+- e manuf_specific_1 9
+- e manuf_specific_2 10
+- e manuf_specific_3 11
+- e manuf_specific_4 12
+- e manuf_specific_5 13
+- e manuf_specific_6 14
+frame_format_descriptor_4(n) 0x0060 32 f
+- l n 0 7 4
+- f pixels 0 15
+- f pcode 28 31
+- e embedded 1
+- e dummy_pixel 2
+- e black_pixel 3
+- e dark_pixel 4
+- e visible_pixel 5
+- e manuf_specific_0 8
+- e manuf_specific_1 9
+- e manuf_specific_2 10
+- e manuf_specific_3 11
+- e manuf_specific_4 12
+- e manuf_specific_5 13
+- e manuf_specific_6 14
+
+# analog gain description registers
+analog_gain_capability 0x0080 16
+- e global 0
+- e alternate_global 2
+analog_gain_code_min 0x0084 16
+analog_gain_code_max 0x0086 16
+analog_gain_code_step 0x0088 16
+analog_gain_type 0x008a 16
+analog_gain_m0 0x008c 16
+analog_gain_c0 0x008e 16
+analog_gain_m1 0x0090 16
+analog_gain_c1 0x0092 16
+analog_linear_gain_min 0x0094 16 v1.1
+analog_linear_gain_max 0x0096 16 v1.1
+analog_linear_gain_step_size 0x0098 16 v1.1
+analog_exponential_gain_min 0x009a 16 v1.1
+analog_exponential_gain_max 0x009c 16 v1.1
+analog_exponential_gain_step_size 0x009e 16 v1.1
+
+# data format description registers
+data_format_model_type 0x00c0 8
+- e normal 1
+- e extended 2
+data_format_model_subtype 0x00c1 8
+- f rows 0 3
+- f columns 4 7
+data_format_descriptor(n) 0x00c2 16 f
+- l n 0 15 2
+- f compressed 0 7
+- f uncompressed 8 15
+
+# general set-up registers
+mode_select 0x0100 8
+- e software_standby 0
+- e streaming 1
+image_orientation 0x0101 8
+- b horizontal_mirror 0
+- b vertical_flip 1
+software_reset 0x0103 8
+- e off 0
+- e on 1
+grouped_parameter_hold 0x0104 8
+mask_corrupted_frames 0x0105 8
+- e allow 0
+- e mask 1
+fast_standby_ctrl 0x0106 8
+- e complete_frames 0
+- e frame_truncation 1
+CCI_address_ctrl 0x0107 8
+2nd_CCI_if_ctrl 0x0108 8
+- b enable 0
+- b ack 1
+2nd_CCI_address_ctrl 0x0109 8
+CSI_channel_identifier 0x0110 8
+CSI_signaling_mode 0x0111 8
+- e csi_2_dphy 2
+- e csi_2_cphy 3
+CSI_data_format 0x0112 16
+CSI_lane_mode 0x0114 8
+DPCM_Frame_DT 0x011d 8
+Bottom_embedded_data_DT 0x011e 8
+Bottom_embedded_data_VC 0x011f 8
+
+gain_mode 0x0120 8
+- e global 0
+- e alternate 1
+ADC_bit_depth 0x0121 8
+emb_data_ctrl 0x0122 v1.1
+- b raw8_packing_for_raw16 0
+- b raw10_packing_for_raw20 1
+- b raw12_packing_for_raw24 2
+
+GPIO_TRIG_mode 0x0130 8
+extclk_frequency_mhz 0x0136 16 ireal
+temp_sensor_ctrl 0x0138 8
+- b enable 0
+temp_sensor_mode 0x0139 8
+temp_sensor_output 0x013a 8
+
+# integration time registers
+fine_integration_time 0x0200 16
+coarse_integration_time 0x0202 16
+
+# analog gain registers
+analog_gain_code_global 0x0204 16
+analog_linear_gain_global 0x0206 16 v1.1
+analog_exponential_gain_global 0x0208 16 v1.1
+
+# digital gain registers
+digital_gain_global 0x020e 16
+
+# hdr control registers
+Short_analog_gain_global 0x0216 16
+Short_digital_gain_global 0x0218 16
+
+HDR_mode 0x0220 8
+- b enabled 0
+- b separate_analog_gain 1
+- b upscaling 2
+- b reset_sync 3
+- b timing_mode 4
+- b exposure_ctrl_direct 5
+- b separate_digital_gain 6
+HDR_resolution_reduction 0x0221 8
+- f row 0 3
+- f column 4 7
+Exposure_ratio 0x0222 8
+HDR_internal_bit_depth 0x0223 8
+Direct_short_integration_time 0x0224 16
+Short_analog_linear_gain_global 0x0226 16 v1.1
+Short_analog_exponential_gain_global 0x0228 16 v1.1
+
+# clock set-up registers
+vt_pix_clk_div 0x0300 16
+vt_sys_clk_div 0x0302 16
+pre_pll_clk_div 0x0304 16
+#vt_pre_pll_clk_div 0x0304 16
+pll_multiplier 0x0306 16
+#vt_pll_multiplier 0x0306 16
+op_pix_clk_div 0x0308 16
+op_sys_clk_div 0x030a 16
+op_pre_pll_clk_div 0x030c 16
+op_pll_multiplier 0x030e 16
+pll_mode 0x0310 8
+- f 0 0
+- e single 0
+- e dual 1
+op_pix_clk_div_rev 0x0312 16 v1.1
+op_sys_clk_div_rev 0x0314 16 v1.1
+
+# frame timing registers
+frame_length_lines 0x0340 16
+line_length_pck 0x0342 16
+
+# image size registers
+x_addr_start 0x0344 16
+y_addr_start 0x0346 16
+x_addr_end 0x0348 16
+y_addr_end 0x034a 16
+x_output_size 0x034c 16
+y_output_size 0x034e 16
+
+# timing mode registers
+Frame_length_ctrl 0x0350 8
+- b automatic 0
+Timing_mode_ctrl 0x0352 8
+- b manual_readout 0
+- b delayed_exposure 1
+Start_readout_rs 0x0353 8
+- b manual_readout_start 0
+Frame_margin 0x0354 16
+
+# sub-sampling registers
+x_even_inc 0x0380 16
+x_odd_inc 0x0382 16
+y_even_inc 0x0384 16
+y_odd_inc 0x0386 16
+
+# monochrome readout registers
+monochrome_en 0x0390 v1.1
+- e enabled 0
+
+# image scaling registers
+Scaling_mode 0x0400 16
+- e no_scaling 0
+- e horizontal 1
+scale_m 0x0404 16
+scale_n 0x0406 16
+digital_crop_x_offset 0x0408 16
+digital_crop_y_offset 0x040a 16
+digital_crop_image_width 0x040c 16
+digital_crop_image_height 0x040e 16
+
+# image compression registers
+compression_mode 0x0500 16
+- e none 0
+- e dpcm_pcm_simple 1
+
+# test pattern registers
+test_pattern_mode 0x0600 16
+- e none 0
+- e solid_color 1
+- e color_bars 2
+- e fade_to_grey 3
+- e pn9 4
+- e color_tile 5
+test_data_red 0x0602 16
+test_data_greenR 0x0604 16
+test_data_blue 0x0606 16
+test_data_greenB 0x0608 16
+value_step_size_smooth 0x060a 8
+value_step_size_quantised 0x060b 8
+
+# phy configuration registers
+tclk_post 0x0800 8
+ths_prepare 0x0801 8
+ths_zero_min 0x0802 8
+ths_trail 0x0803 8
+tclk_trail_min 0x0804 8
+tclk_prepare 0x0805 8
+tclk_zero 0x0806 8
+tlpx 0x0807 8
+phy_ctrl 0x0808 8
+- e auto 0
+- e UI 1
+- e manual 2
+tclk_post_ex 0x080a 16
+ths_prepare_ex 0x080c 16
+ths_zero_min_ex 0x080e 16
+ths_trail_ex 0x0810 16
+tclk_trail_min_ex 0x0812 16
+tclk_prepare_ex 0x0814 16
+tclk_zero_ex 0x0816 16
+tlpx_ex 0x0818 16
+
+# link rate register
+requested_link_rate 0x0820 32 u16.16
+
+# equalization control registers
+DPHY_equalization_mode 0x0824 8 v1.1
+- b eq2 0
+PHY_equalization_ctrl 0x0825 8 v1.1
+- b enable 0
+
+# d-phy preamble control registers
+DPHY_preamble_ctrl 0x0826 8 v1.1
+- b enable 0
+DPHY_preamble_length 0x0826 8 v1.1
+
+# d-phy spread spectrum control registers
+PHY_SSC_ctrl 0x0828 8 v1.1
+- b enable 0
+
+# manual lp control register
+manual_LP_ctrl 0x0829 8 v1.1
+- b enable 0
+
+# additional phy configuration registers
+twakeup 0x082a v1.1
+tinit 0x082b v1.1
+ths_exit 0x082c v1.1
+ths_exit_ex 0x082e 16 v1.1
+
+# phy calibration configuration registers
+PHY_periodic_calibration_ctrl 0x0830 8
+- b frame_blanking 0
+PHY_periodic_calibration_interval 0x0831 8
+PHY_init_calibration_ctrl 0x0832 8
+- b stream_start 0
+DPHY_calibration_mode 0x0833 8 v1.1
+- b also_alternate 0
+CPHY_calibration_mode 0x0834 8 v1.1
+- e format_1 0
+- e format_2 1
+- e format_3 2
+t3_calpreamble_length 0x0835 8 v1.1
+t3_calpreamble_length_per 0x0836 8 v1.1
+t3_calaltseq_length 0x0837 8 v1.1
+t3_calaltseq_length_per 0x0838 8 v1.1
+FM2_init_seed 0x083a 16 v1.1
+t3_caludefseq_length 0x083c 16 v1.1
+t3_caludefseq_length_per 0x083e 16 v1.1
+
+# c-phy manual control registers
+TGR_Preamble_Length 0x0841 8
+- b preamable_prog_seq 7
+- f begin_preamble_length 0 5
+TGR_Post_Length 0x0842 8
+- f post_length 0 4
+TGR_Preamble_Prog_Sequence(n2) 0x0843
+- l n2 0 6 1
+- f symbol_n_1 3 5
+- f symbol_n 0 2
+t3_prepare 0x084e 16
+t3_lpx 0x0850 16
+
+# alps control register
+ALPS_ctrl 0x085a 8
+- b lvlp_dphy 0
+- b lvlp_cphy 1
+- b alp_cphy 2
+
+# lrte control registers
+TX_REG_CSI_EPD_EN_SSP_cphy 0x0860 16
+TX_REG_CSI_EPD_OP_SLP_cphy 0x0862 16
+TX_REG_CSI_EPD_EN_SSP_dphy 0x0864 16
+TX_REG_CSI_EPD_OP_SLP_dphy 0x0866 16
+TX_REG_CSI_EPD_MISC_OPTION_cphy 0x0868 v1.1
+TX_REG_CSI_EPD_MISC_OPTION_dphy 0x0869 v1.1
+
+# scrambling control registers
+Scrambling_ctrl 0x0870
+- b enabled 0
+- f 2 3
+- e 1_seed_cphy 0
+- e 4_seed_cphy 3
+lane_seed_value(seed, lane) 0x0872 16
+- l seed 0 3 0x10
+- l lane 0 7 0x2
+
+# usl control registers
+TX_USL_REV_ENTRY 0x08c0 16 v1.1
+TX_USL_REV_Clock_Counter 0x08c2 16 v1.1
+TX_USL_REV_LP_Counter 0x08c4 16 v1.1
+TX_USL_REV_Frame_Counter 0x08c6 16 v1.1
+TX_USL_REV_Chronological_Timer 0x08c8 16 v1.1
+TX_USL_FWD_ENTRY 0x08ca 16 v1.1
+TX_USL_GPIO 0x08cc 16 v1.1
+TX_USL_Operation 0x08ce 16 v1.1
+- b reset 0
+TX_USL_ALP_ctrl 0x08d0 16 v1.1
+- b clock_pause 0
+TX_USL_APP_BTA_ACK_TIMEOUT 0x08d2 16 v1.1
+TX_USL_SNS_BTA_ACK_TIMEOUT 0x08d2 16 v1.1
+USL_Clock_Mode_d_ctrl 0x08d2 v1.1
+- b cont_clock_standby 0
+- b cont_clock_vblank 1
+- b cont_clock_hblank 2
+
+# binning configuration registers
+binning_mode 0x0900 8
+binning_type 0x0901 8
+binning_weighting 0x0902 8
+
+# data transfer interface registers
+data_transfer_if_1_ctrl 0x0a00 8
+- b enable 0
+- b write 1
+- b clear_error 2
+data_transfer_if_1_status 0x0a01 8
+- b read_if_ready 0
+- b write_if_ready 1
+- b data_corrupted 2
+- b improper_if_usage 3
+data_transfer_if_1_page_select 0x0a02 8
+data_transfer_if_1_data(p) 0x0a04 8 f
+- l p 0 63 1
+
+# image processing and sensor correction configuration registers
+shading_correction_en 0x0b00 8
+- b enable 0
+luminance_correction_level 0x0b01 8
+green_imbalance_filter_en 0x0b02 8
+- b enable 0
+mapped_defect_correct_en 0x0b05 8
+- b enable 0
+single_defect_correct_en 0x0b06 8
+- b enable 0
+dynamic_couplet_correct_en 0x0b08 8
+- b enable 0
+combined_defect_correct_en 0x0b0a 8
+- b enable 0
+module_specific_correction_en 0x0b0c 8
+- b enable 0
+dynamic_triplet_defect_correct_en 0x0b13 8
+- b enable 0
+NF_ctrl 0x0b15 8
+- b luma 0
+- b chroma 1
+- b combined 2
+
+# optical black pixel readout registers
+OB_readout_control 0x0b30 8
+- b enable 0
+- b interleaving 1
+OB_virtual_channel 0x0b31 8
+OB_DT 0x0b32 8
+OB_data_format 0x0b33 8
+
+# color temperature feedback registers
+color_temperature 0x0b8c 16
+absolute_gain_greenr 0x0b8e 16
+absolute_gain_red 0x0b90 16
+absolute_gain_blue 0x0b92 16
+absolute_gain_greenb 0x0b94 16
+
+# cfa conversion registers
+CFA_conversion_ctrl 0x0ba0 v1.1
+- b bayer_conversion_enable 0
+
+# flash strobe and sa strobe control registers
+flash_strobe_adjustment 0x0c12 8
+flash_strobe_start_point 0x0c14 16
+tflash_strobe_delay_rs_ctrl 0x0c16 16
+tflash_strobe_width_high_rs_ctrl 0x0c18 16
+flash_mode_rs 0x0c1a 8
+- b continuous 0
+- b truncate 1
+- b async 3
+flash_trigger_rs 0x0c1b 8
+flash_status 0x0c1c 8
+- b retimed 0
+sa_strobe_mode 0x0c1d 8
+- b continuous 0
+- b truncate 1
+- b async 3
+- b adjust_edge 4
+sa_strobe_start_point 0x0c1e 16
+tsa_strobe_delay_ctrl 0x0c20 16
+tsa_strobe_width_ctrl 0x0c22 16
+sa_strobe_trigger 0x0c24 8
+sa_strobe_status 0x0c25 8
+- b retimed 0
+tSA_strobe_re_delay_ctrl 0x0c30 16
+tSA_strobe_fe_delay_ctrl 0x0c32 16
+
+# pdaf control registers
+PDAF_ctrl 0x0d00 16
+- b enable 0
+- b processed 1
+- b interleaved 2
+- b visible_pdaf_correction 3
+PDAF_VC 0x0d02 8
+PDAF_DT 0x0d03 8
+pd_x_addr_start 0x0d04 16
+pd_y_addr_start 0x0d06 16
+pd_x_addr_end 0x0d08 16
+pd_y_addr_end 0x0d0a 16
+
+# bracketing interface configuration registers
+bracketing_LUT_ctrl 0x0e00 8
+bracketing_LUT_mode 0x0e01 8
+- b continue_streaming 0
+- b loop_mode 1
+bracketing_LUT_entry_ctrl 0x0e02 8
+bracketing_LUT_frame(n) 0x0e10 v1.1 f
+- l n 0 0xef 1
+
+# integration time and gain parameter limit registers
+integration_time_capability 0x1000 16
+- b fine 0
+coarse_integration_time_min 0x1004 16
+coarse_integration_time_max_margin 0x1006 16
+fine_integration_time_min 0x1008 16
+fine_integration_time_max_margin 0x100a 16
+
+# digital gain parameter limit registers
+digital_gain_capability 0x1081
+- e none 0
+- e global 2
+digital_gain_min 0x1084 16
+digital_gain_max 0x1086 16
+digital_gain_step_size 0x1088 16
+
+# data pedestal capability registers
+Pedestal_capability 0x10e0 8 v1.1
+
+# adc capability registers
+ADC_capability 0x10f0 8
+- b bit_depth_ctrl 0
+ADC_bit_depth_capability 0x10f4 32 v1.1
+
+# video timing parameter limit registers
+min_ext_clk_freq_mhz 0x1100 32 float_ireal
+max_ext_clk_freq_mhz 0x1104 32 float_ireal
+min_pre_pll_clk_div 0x1108 16
+# min_vt_pre_pll_clk_div 0x1108 16
+max_pre_pll_clk_div 0x110a 16
+# max_vt_pre_pll_clk_div 0x110a 16
+min_pll_ip_clk_freq_mhz 0x110c 32 float_ireal
+# min_vt_pll_ip_clk_freq_mhz 0x110c 32 float_ireal
+max_pll_ip_clk_freq_mhz 0x1110 32 float_ireal
+# max_vt_pll_ip_clk_freq_mhz 0x1110 32 float_ireal
+min_pll_multiplier 0x1114 16
+# min_vt_pll_multiplier 0x1114 16
+max_pll_multiplier 0x1116 16
+# max_vt_pll_multiplier 0x1116 16
+min_pll_op_clk_freq_mhz 0x1118 32 float_ireal
+max_pll_op_clk_freq_mhz 0x111c 32 float_ireal
+
+# video timing set-up capability registers
+min_vt_sys_clk_div 0x1120 16
+max_vt_sys_clk_div 0x1122 16
+min_vt_sys_clk_freq_mhz 0x1124 32 float_ireal
+max_vt_sys_clk_freq_mhz 0x1128 32 float_ireal
+min_vt_pix_clk_freq_mhz 0x112c 32 float_ireal
+max_vt_pix_clk_freq_mhz 0x1130 32 float_ireal
+min_vt_pix_clk_div 0x1134 16
+max_vt_pix_clk_div 0x1136 16
+clock_calculation 0x1138
+- b lane_speed 0
+- b link_decoupled 1
+- b dual_pll_op_sys_ddr 2
+- b dual_pll_op_pix_ddr 3
+num_of_vt_lanes 0x1139
+num_of_op_lanes 0x113a
+op_bits_per_lane 0x113b 8 v1.1
+
+# frame timing parameter limits
+min_frame_length_lines 0x1140 16
+max_frame_length_lines 0x1142 16
+min_line_length_pck 0x1144 16
+max_line_length_pck 0x1146 16
+min_line_blanking_pck 0x1148 16
+min_frame_blanking_lines 0x114a 16
+min_line_length_pck_step_size 0x114c
+timing_mode_capability 0x114d
+- b auto_frame_length 0
+- b rolling_shutter_manual_readout 2
+- b delayed_exposure_start 3
+- b manual_exposure_embedded_data 4
+frame_margin_max_value 0x114e 16
+frame_margin_min_value 0x1150
+gain_delay_type 0x1151
+- e fixed 0
+- e variable 1
+
+# output clock set-up capability registers
+min_op_sys_clk_div 0x1160 16
+max_op_sys_clk_div 0x1162 16
+min_op_sys_clk_freq_mhz 0x1164 32 float_ireal
+max_op_sys_clk_freq_mhz 0x1168 32 float_ireal
+min_op_pix_clk_div 0x116c 16
+max_op_pix_clk_div 0x116e 16
+min_op_pix_clk_freq_mhz 0x1170 32 float_ireal
+max_op_pix_clk_freq_mhz 0x1174 32 float_ireal
+
+# image size parameter limit registers
+x_addr_min 0x1180 16
+y_addr_min 0x1182 16
+x_addr_max 0x1184 16
+y_addr_max 0x1186 16
+min_x_output_size 0x1188 16
+min_y_output_size 0x118a 16
+max_x_output_size 0x118c 16
+max_y_output_size 0x118e 16
+
+x_addr_start_div_constant 0x1190 v1.1
+y_addr_start_div_constant 0x1191 v1.1
+x_addr_end_div_constant 0x1192 v1.1
+y_addr_end_div_constant 0x1193 v1.1
+x_size_div 0x1194 v1.1
+y_size_div 0x1195 v1.1
+x_output_div 0x1196 v1.1
+y_output_div 0x1197 v1.1
+non_flexible_resolution_support 0x1198 v1.1
+- b new_pix_addr 0
+- b new_output_res 1
+- b output_crop_no_pad 2
+- b output_size_lane_dep 3
+
+min_op_pre_pll_clk_div 0x11a0 16
+max_op_pre_pll_clk_div 0x11a2 16
+min_op_pll_ip_clk_freq_mhz 0x11a4 32 float_ireal
+max_op_pll_ip_clk_freq_mhz 0x11a8 32 float_ireal
+min_op_pll_multiplier 0x11ac 16
+max_op_pll_multiplier 0x11ae 16
+min_op_pll_op_clk_freq_mhz 0x11b0 32 float_ireal
+max_op_pll_op_clk_freq_mhz 0x11b4 32 float_ireal
+clock_tree_pll_capability 0x11b8 8
+- b dual_pll 0
+- b single_pll 1
+- b ext_divider 2
+- b flexible_op_pix_clk_div 3
+clock_capa_type_capability 0x11b9 v1.1
+- b ireal 0
+
+# sub-sampling parameters limit registers
+min_even_inc 0x11c0 16
+min_odd_inc 0x11c2 16
+max_even_inc 0x11c4 16
+max_odd_inc 0x11c6 16
+aux_subsamp_capability 0x11c8 v1.1
+- b factor_power_of_2 1
+aux_subsamp_mono_capability 0x11c9 v1.1
+- b factor_power_of_2 1
+monochrome_capability 0x11ca v1.1
+- e inc_odd 0
+- e inc_even 1
+pixel_readout_capability 0x11cb v1.1
+- e bayer 0
+- e monochrome 1
+- e bayer_and_mono 2
+min_even_inc_mono 0x11cc 16 v1.1
+max_even_inc_mono 0x11ce 16 v1.1
+min_odd_inc_mono 0x11d0 16 v1.1
+max_odd_inc_mono 0x11d2 16 v1.1
+min_even_inc_bc2 0x11d4 16 v1.1
+max_even_inc_bc2 0x11d6 16 v1.1
+min_odd_inc_bc2 0x11d8 16 v1.1
+max_odd_inc_bc2 0x11da 16 v1.1
+min_even_inc_mono_bc2 0x11dc 16 v1.1
+max_even_inc_mono_bc2 0x11de 16 v1.1
+min_odd_inc_mono_bc2 0x11f0 16 v1.1
+max_odd_inc_mono_bc2 0x11f2 16 v1.1
+
+# image scaling limit parameters
+scaling_capability 0x1200 16
+- e none 0
+- e horizontal 1
+- e reserved 2
+scaler_m_min 0x1204 16
+scaler_m_max 0x1206 16
+scaler_n_min 0x1208 16
+scaler_n_max 0x120a 16
+digital_crop_capability 0x120e
+- e none 0
+- e input_crop 1
+
+# hdr limit registers
+hdr_capability_1 0x1210
+- b 2x2_binning 0
+- b combined_analog_gain 1
+- b separate_analog_gain 2
+- b upscaling 3
+- b reset_sync 4
+- b direct_short_exp_timing 5
+- b direct_short_exp_synthesis 6
+min_hdr_bit_depth 0x1211
+hdr_resolution_sub_types 0x1212
+hdr_resolution_sub_type(n) 0x1213
+- l n 0 1 1
+- f row 0 3
+- f column 4 7
+hdr_capability_2 0x121b
+- b combined_digital_gain 0
+- b separate_digital_gain 1
+- b timing_mode 3
+- b synthesis_mode 4
+max_hdr_bit_depth 0x121c
+
+# usl capability register
+usl_support_capability 0x1230 v1.1
+- b clock_tree 0
+- b rev_clock_tree 1
+- b rev_clock_calc 2
+usl_clock_mode_d_capability 0x1231 v1.1
+- b cont_clock_standby 0
+- b cont_clock_vblank 1
+- b cont_clock_hblank 2
+- b noncont_clock_standby 3
+- b noncont_clock_vblank 4
+- b noncont_clock_hblank 5
+min_op_sys_clk_div_rev 0x1234 v1.1
+max_op_sys_clk_div_rev 0x1236 v1.1
+min_op_pix_clk_div_rev 0x1238 v1.1
+max_op_pix_clk_div_rev 0x123a v1.1
+min_op_sys_clk_freq_rev_mhz 0x123c 32 v1.1 float_ireal
+max_op_sys_clk_freq_rev_mhz 0x1240 32 v1.1 float_ireal
+min_op_pix_clk_freq_rev_mhz 0x1244 32 v1.1 float_ireal
+max_op_pix_clk_freq_rev_mhz 0x1248 32 v1.1 float_ireal
+max_bitrate_rev_d_mode_mbps 0x124c 32 v1.1 ireal
+max_symrate_rev_c_mode_msps 0x1250 32 v1.1 ireal
+
+# image compression capability registers
+compression_capability 0x1300
+- b dpcm_pcm_simple 0
+
+# test mode capability registers
+test_mode_capability 0x1310 16
+- b solid_color 0
+- b color_bars 1
+- b fade_to_grey 2
+- b pn9 3
+- b color_tile 5
+pn9_data_format1 0x1312
+pn9_data_format2 0x1313
+pn9_data_format3 0x1314
+pn9_data_format4 0x1315
+pn9_misc_capability 0x1316
+- f num_pixels 0 2
+- b compression 3
+test_pattern_capability 0x1317 v1.1
+- b no_repeat 1
+pattern_size_div_m1 0x1318 v1.1
+
+# fifo capability registers
+fifo_support_capability 0x1502
+- e none 0
+- e derating 1
+- e derating_overrating 2
+
+# csi-2 capability registers
+phy_ctrl_capability 0x1600
+- b auto_phy_ctl 0
+- b ui_phy_ctl 1
+- b dphy_time_ui_reg_1_ctl 2
+- b dphy_time_ui_reg_2_ctl 3
+- b dphy_time_ctl 4
+- b dphy_ext_time_ui_reg_1_ctl 5
+- b dphy_ext_time_ui_reg_2_ctl 6
+- b dphy_ext_time_ctl 7
+csi_dphy_lane_mode_capability 0x1601
+- b 1_lane 0
+- b 2_lane 1
+- b 3_lane 2
+- b 4_lane 3
+- b 5_lane 4
+- b 6_lane 5
+- b 7_lane 6
+- b 8_lane 7
+csi_signaling_mode_capability 0x1602
+- b csi_dphy 2
+- b csi_cphy 3
+fast_standby_capability 0x1603
+- e no_frame_truncation 0
+- e frame_truncation 1
+csi_address_control_capability 0x1604
+- b cci_addr_change 0
+- b 2nd_cci_addr 1
+- b sw_changeable_2nd_cci_addr 2
+data_type_capability 0x1605
+- b dpcm_programmable 0
+- b bottom_embedded_dt_programmable 1
+- b bottom_embedded_vc_programmable 2
+- b ext_vc_range 3
+csi_cphy_lane_mode_capability 0x1606
+- b 1_lane 0
+- b 2_lane 1
+- b 3_lane 2
+- b 4_lane 3
+- b 5_lane 4
+- b 6_lane 5
+- b 7_lane 6
+- b 8_lane 7
+emb_data_capability 0x1607 v1.1
+- b two_bytes_per_raw16 0
+- b two_bytes_per_raw20 1
+- b two_bytes_per_raw24 2
+- b no_one_byte_per_raw16 3
+- b no_one_byte_per_raw20 4
+- b no_one_byte_per_raw24 5
+max_per_lane_bitrate_lane_d_mode_mbps(n) 0x1608 32 ireal
+- l n 0 7 4 4,0x32
+temp_sensor_capability 0x1618
+- b supported 0
+- b CCS_format 1
+- b reset_0x80 2
+max_per_lane_bitrate_lane_c_mode_mbps(n) 0x161a 32 ireal
+- l n 0 7 4 4,0x30
+dphy_equalization_capability 0x162b
+- b equalization_ctrl 0
+- b eq1 1
+- b eq2 2
+cphy_equalization_capability 0x162c
+- b equalization_ctrl 0
+dphy_preamble_capability 0x162d
+- b preamble_seq_ctrl 0
+dphy_ssc_capability 0x162e
+- b supported 0
+cphy_calibration_capability 0x162f
+- b manual 0
+- b manual_streaming 1
+- b format_1_ctrl 2
+- b format_2_ctrl 3
+- b format_3_ctrl 4
+dphy_calibration_capability 0x1630
+- b manual 0
+- b manual_streaming 1
+- b alternate_seq 2
+phy_ctrl_capability_2 0x1631
+- b tgr_length 0
+- b tgr_preamble_prog_seq 1
+- b extra_cphy_manual_timing 2
+- b clock_based_manual_cdphy 3
+- b clock_based_manual_dphy 4
+- b clock_based_manual_cphy 5
+- b manual_lp_dphy 6
+- b manual_lp_cphy 7
+lrte_cphy_capability 0x1632
+- b pdq_short 0
+- b spacer_short 1
+- b pdq_long 2
+- b spacer_long 3
+- b spacer_no_pdq 4
+lrte_dphy_capability 0x1633
+- b pdq_short_opt1 0
+- b spacer_short_opt1 1
+- b pdq_long_opt1 2
+- b spacer_long_opt1 3
+- b spacer_short_opt2 4
+- b spacer_long_opt2 5
+- b spacer_no_pdq_opt1 6
+- b spacer_variable_opt2 7
+alps_capability_dphy 0x1634
+- e lvlp_not_supported 0 0x3
+- e lvlp_supported 1 0x3
+- e controllable_lvlp 2 0x3
+alps_capability_cphy 0x1635
+- e lvlp_not_supported 0 0x3
+- e lvlp_supported 1 0x3
+- e controllable_lvlp 2 0x3
+- e alp_not_supported 0xc 0xc
+- e alp_supported 0xd 0xc
+- e controllable_alp 0xe 0xc
+scrambling_capability 0x1636
+- b scrambling_supported 0
+- f max_seeds_per_lane_c 1 2
+- e 1 0
+- e 4 3
+- f num_seed_regs 3 5
+- e 0 0
+- e 1 1
+- e 4 4
+- b num_seed_per_lane 6
+dphy_manual_constant 0x1637
+cphy_manual_constant 0x1638
+CSI2_interface_capability_misc 0x1639 v1.1
+- b eotp_short_pkt_opt2 0
+PHY_ctrl_capability_3 0x165c v1.1
+- b dphy_timing_not_multiple 0
+- b dphy_min_timing_value_1 1
+- b twakeup_supported 2
+- b tinit_supported 3
+- b ths_exit_supported 4
+- b cphy_timing_not_multiple 5
+- b cphy_min_timing_value_1 6
+dphy_sf 0x165d v1.1
+cphy_sf 0x165e v1.1
+- f twakeup 0 3
+- f tinit 4 7
+dphy_limits_1 0x165f v1.1
+- f ths_prepare 0 3
+- f ths_zero 4 7
+dphy_limits_2 0x1660 v1.1
+- f ths_trail 0 3
+- f tclk_trail_min 4 7
+dphy_limits_3 0x1661 v1.1
+- f tclk_prepare 0 3
+- f tclk_zero 4 7
+dphy_limits_4 0x1662 v1.1
+- f tclk_post 0 3
+- f tlpx 4 7
+dphy_limits_5 0x1663 v1.1
+- f ths_exit 0 3
+- f twakeup 4 7
+dphy_limits_6 0x1664 v1.1
+- f tinit 0 3
+cphy_limits_1 0x1665 v1.1
+- f t3_prepare_max 0 3
+- f t3_lpx_max 4 7
+cphy_limits_2 0x1666 v1.1
+- f ths_exit_max 0 3
+- f twakeup_max 4 7
+cphy_limits_3 0x1667 v1.1
+- f tinit_max 0 3
+
+# binning capability registers
+min_frame_length_lines_bin 0x1700 16
+max_frame_length_lines_bin 0x1702 16
+min_line_length_pck_bin 0x1704 16
+max_line_length_pck_bin 0x1706 16
+min_line_blanking_pck_bin 0x1708 16
+fine_integration_time_min_bin 0x170a 16
+fine_integration_time_max_margin_bin 0x170c 16
+binning_capability 0x1710
+- e unsupported 0
+- e binning_then_subsampling 1
+- e subsampling_then_binning 2
+binning_weighting_capability 0x1711
+- b averaged 0
+- b summed 1
+- b bayer_corrected 2
+- b module_specific_weight 3
+binning_sub_types 0x1712
+binning_sub_type(n) 0x1713
+- l n 0 63 1
+- f row 0 3
+- f column 4 7
+binning_weighting_mono_capability 0x1771 v1.1
+- b averaged 0
+- b summed 1
+- b bayer_corrected 2
+- b module_specific_weight 3
+binning_sub_types_mono 0x1772 v1.1
+binning_sub_type_mono(n) 0x1773 v1.1 f
+- l n 0 63 1
+
+# data transfer interface capability registers
+data_transfer_if_capability 0x1800
+- b supported 0
+- b polling 2
+
+# sensor correction capability registers
+shading_correction_capability 0x1900
+- b color_shading 0
+- b luminance_correction 1
+green_imbalance_capability 0x1901
+- b supported 0
+module_specific_correction_capability 0x1903
+defect_correction_capability 0x1904 16
+- b mapped_defect 0
+- b dynamic_couplet 2
+- b dynamic_single 5
+- b combined_dynamic 8
+defect_correction_capability_2 0x1906 16
+- b dynamic_triplet 3
+nf_capability 0x1908
+- b luma 0
+- b chroma 1
+- b combined 2
+
+# optical black readout capability registers
+ob_readout_capability 0x1980
+- b controllable_readout 0
+- b visible_pixel_readout 1
+- b different_vc_readout 2
+- b different_dt_readout 3
+- b prog_data_format 4
+
+# color feedback capability registers
+color_feedback_capability 0x1987
+- b kelvin 0
+- b awb_gain 1
+
+# cfa pattern capability registers
+CFA_pattern_capability 0x1990 v1.1
+- e bayer 0
+- e monochrome 1
+- e 4x4_quad_bayer 2
+- e vendor_specific 3
+CFA_pattern_conversion_capability 0x1991 v1.1
+- b bayer 0
+
+# timer capability registers
+flash_mode_capability 0x1a02
+- b single_strobe 0
+sa_strobe_mode_capability 0x1a03
+- b fixed_width 0
+- b edge_ctrl 1
+
+# soft reset capability registers
+reset_max_delay 0x1a10 v1.1
+reset_min_time 0x1a11 v1.1
+
+# pdaf capability registers
+pdaf_capability_1 0x1b80
+- b supported 0
+- b processed_bottom_embedded 1
+- b processed_interleaved 2
+- b raw_bottom_embedded 3
+- b raw_interleaved 4
+- b visible_pdaf_correction 5
+- b vc_interleaving 6
+- b dt_interleaving 7
+pdaf_capability_2 0x1b81
+- b ROI 0
+- b after_digital_crop 1
+- b ctrl_retimed 2
+
+# bracketing interface capability registers
+bracketing_lut_capability_1 0x1c00
+- b coarse_integration 0
+- b global_analog_gain 1
+- b flash 4
+- b global_digital_gain 5
+- b alternate_global_analog_gain 6
+bracketing_lut_capability_2 0x1c01
+- b single_bracketing_mode 0
+- b looped_bracketing_mode 1
+bracketing_lut_size 0x1c02
diff --git a/Documentation/driver-api/media/drivers/ccs/ccs.rst b/Documentation/driver-api/media/drivers/ccs/ccs.rst
new file mode 100644
index 0000000000..7389204afc
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/ccs/ccs.rst
@@ -0,0 +1,117 @@
+.. SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause
+
+.. include:: <isonum.txt>
+
+MIPI CCS camera sensor driver
+=============================
+
+The MIPI CCS camera sensor driver is a generic driver for `MIPI CCS
+<https://www.mipi.org/specifications/camera-command-set>`_ compliant
+camera sensors. It exposes three sub-devices representing the pixel array,
+the binner and the scaler.
+
+As the capabilities of individual devices vary, the driver exposes
+interfaces based on the capabilities that exist in hardware.
+
+Pixel Array sub-device
+----------------------
+
+The pixel array sub-device represents the camera sensor's pixel matrix, as well
+as analogue crop functionality present in many compliant devices. The analogue
+crop is configured using the ``V4L2_SEL_TGT_CROP`` on the source pad (0) of the
+entity. The size of the pixel matrix can be obtained by getting the
+``V4L2_SEL_TGT_NATIVE_SIZE`` target.
+
+Binner
+------
+
+The binner sub-device represents the binning functionality on the sensor. For
+that purpose, selection target ``V4L2_SEL_TGT_COMPOSE`` is supported on the
+sink pad (0).
+
+Additionally, if a device has no scaler or digital crop functionality, the
+source pad (1) expses another digital crop selection rectangle that can only
+crop at the end of the lines and frames.
+
+Scaler
+------
+
+The scaler sub-device represents the digital crop and scaling functionality of
+the sensor. The V4L2 selection target ``V4L2_SEL_TGT_CROP`` is used to
+configure the digital crop on the sink pad (0) when digital crop is supported.
+Scaling is configured using selection target ``V4L2_SEL_TGT_COMPOSE`` on the
+sink pad (0) as well.
+
+Additionally, if the scaler sub-device exists, its source pad (1) exposes
+another digital crop selection rectangle that can only crop at the end of the
+lines and frames.
+
+Digital and analogue crop
+-------------------------
+
+Digital crop functionality is referred to as cropping that effectively works by
+dropping some data on the floor. Analogue crop, on the other hand, means that
+the cropped information is never retrieved. In case of camera sensors, the
+analogue data is never read from the pixel matrix that are outside the
+configured selection rectangle that designates crop. The difference has an
+effect in device timing and likely also in power consumption.
+
+CCS static data
+---------------
+
+The MIPI CCS driver supports CCS static data for all compliant devices,
+including not just those compliant with CCS 1.1 but also CCS 1.0 and SMIA(++).
+For CCS the file names are formed as
+
+ ccs/ccs-sensor-vvvv-mmmm-rrrr.fw (sensor) and
+ ccs/ccs-module-vvvv-mmmm-rrrr.fw (module).
+
+For SMIA++ compliant devices the corresponding file names are
+
+ ccs/smiapp-sensor-vv-mmmm-rr.fw (sensor) and
+ ccs/smiapp-module-vv-mmmm-rrrr.fw (module).
+
+For SMIA (non-++) compliant devices the static data file name is
+
+ ccs/smia-sensor-vv-mmmm-rr.fw (sensor).
+
+vvvv or vv denotes MIPI and SMIA manufacturer IDs respectively, mmmm model ID
+and rrrr or rr revision number.
+
+Register definition generator
+-----------------------------
+
+The ccs-regs.asc file contains MIPI CCS register definitions that are used
+to produce C source code files for definitions that can be better used by
+programs written in C language. As there are many dependencies between the
+produced files, please do not modify them manually as it's error-prone and
+in vain, but instead change the script producing them.
+
+Usage
+~~~~~
+
+Conventionally the script is called this way to update the CCS driver
+definitions:
+
+.. code-block:: none
+
+ $ Documentation/driver-api/media/drivers/ccs/mk-ccs-regs -k \
+ -e drivers/media/i2c/ccs/ccs-regs.h \
+ -L drivers/media/i2c/ccs/ccs-limits.h \
+ -l drivers/media/i2c/ccs/ccs-limits.c \
+ -c Documentation/driver-api/media/drivers/ccs/ccs-regs.asc
+
+CCS PLL calculator
+==================
+
+The CCS PLL calculator is used to compute the PLL configuration, given sensor's
+capabilities as well as board configuration and user specified configuration. As
+the configuration space that encompasses all these configurations is vast, the
+PLL calculator isn't entirely trivial. Yet it is relatively simple to use for a
+driver.
+
+The PLL model implemented by the PLL calculator corresponds to MIPI CCS 1.1.
+
+.. kernel-doc:: drivers/media/i2c/ccs-pll.h
+
+**Copyright** |copy| 2020 Intel Corporation
diff --git a/Documentation/driver-api/media/drivers/ccs/mk-ccs-regs b/Documentation/driver-api/media/drivers/ccs/mk-ccs-regs
new file mode 100755
index 0000000000..2a4edc7e05
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/ccs/mk-ccs-regs
@@ -0,0 +1,434 @@
+#!/usr/bin/perl -w
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause
+# Copyright (C) 2019--2020 Intel Corporation
+
+use Getopt::Long qw(:config no_ignore_case);
+use File::Basename;
+
+my $ccsregs = "ccs-regs.asc";
+my $header;
+my $regarray;
+my $limitc;
+my $limith;
+my $kernel;
+my $help;
+
+GetOptions("ccsregs|c=s" => \$ccsregs,
+ "header|e=s" => \$header,
+ "regarray|r=s" => \$regarray,
+ "limitc|l=s" => \$limitc,
+ "limith|L=s" => \$limith,
+ "kernel|k" => \$kernel,
+ "help|h" => \$help) or die "can't parse options";
+
+$help = 1 if ! defined $header || ! defined $limitc || ! defined $limith;
+
+if (defined $help) {
+ print <<EOH
+$0 - Create CCS register definitions for C
+
+usage: $0 -c ccs-regs.asc -e header -r regarray -l limit-c -L limit-header [-k]
+
+ -c ccs register file
+ -e header file name
+ -r register description array file name
+ -l limit and capability array file name
+ -L limit and capability header file name
+ -k generate files for kernel space consumption
+EOH
+ ;
+ exit 0;
+}
+
+my $lh_hdr = ! defined $kernel
+ ? '#include "ccs-os.h"' . "\n"
+ : "#include <linux/bits.h>\n#include <linux/types.h>\n";
+my $uint32_t = ! defined $kernel ? 'uint32_t' : 'u32';
+my $uint16_t = ! defined $kernel ? 'uint16_t' : 'u16';
+
+open(my $R, "< $ccsregs") or die "can't open $ccsregs";
+
+open(my $H, "> $header") or die "can't open $header";
+my $A;
+if (defined $regarray) {
+ open($A, "> $regarray") or die "can't open $regarray";
+}
+open(my $LC, "> $limitc") or die "can't open $limitc";
+open(my $LH, "> $limith") or die "can't open $limith";
+
+my %this;
+
+sub is_limit_reg($) {
+ my $addr = hex $_[0];
+
+ return 0 if $addr < 0x40; # weed out status registers
+ return 0 if $addr >= 0x100 && $addr < 0xfff; # weed out configuration registers
+
+ return 1;
+}
+
+my $uc_header = basename uc $header;
+$uc_header =~ s/[^A-Z0-9]/_/g;
+
+my $copyright = "/* Copyright (C) 2019--2020 Intel Corporation */\n";
+my $license = "SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause";
+my $note = "/*\n * Generated by $0;\n * do not modify.\n */\n";
+
+for my $fh ($A, $LC) {
+ print $fh "// $license\n$copyright$note\n" if defined $fh;
+}
+
+for my $fh ($H, $LH) {
+ print $fh "/* $license */\n$copyright$note\n";
+}
+
+sub bit_def($) {
+ my $bit = shift @_;
+
+ return "BIT($bit)" if defined $kernel;
+ return "(1U << $bit)" if $bit =~ /^[a-zA-Z0-9_]+$/;
+ return "(1U << ($bit))";
+}
+
+print $H <<EOF
+#ifndef __${uc_header}__
+#define __${uc_header}__
+
+EOF
+ ;
+
+print $H "#include <linux/bits.h>\n\n" if defined $kernel;
+
+print $H <<EOF
+#define CCS_FL_BASE 16
+EOF
+ ;
+
+print $H "#define CCS_FL_16BIT " . bit_def("CCS_FL_BASE") . "\n";
+print $H "#define CCS_FL_32BIT " . bit_def("CCS_FL_BASE + 1") . "\n";
+print $H "#define CCS_FL_FLOAT_IREAL " . bit_def("CCS_FL_BASE + 2") . "\n";
+print $H "#define CCS_FL_IREAL " . bit_def("CCS_FL_BASE + 3") . "\n";
+
+print $H <<EOF
+#define CCS_R_ADDR(r) ((r) & 0xffff)
+
+EOF
+ ;
+
+print $A <<EOF
+#include <stdint.h>
+#include <stdio.h>
+#include "ccs-extra.h"
+#include "ccs-regs.h"
+
+EOF
+ if defined $A;
+
+my $uc_limith = basename uc $limith;
+$uc_limith =~ s/[^A-Z0-9]/_/g;
+
+print $LH <<EOF
+#ifndef __${uc_limith}__
+#define __${uc_limith}__
+
+$lh_hdr
+struct ccs_limit {
+ $uint32_t reg;
+ $uint16_t size;
+ $uint16_t flags;
+ const char *name;
+};
+
+EOF
+ ;
+print $LH "#define CCS_L_FL_SAME_REG " . bit_def(0) . "\n\n";
+
+print $LH <<EOF
+extern const struct ccs_limit ccs_limits[];
+
+EOF
+ ;
+
+print $LC <<EOF
+#include "ccs-limits.h"
+#include "ccs-regs.h"
+
+const struct ccs_limit ccs_limits[] = {
+EOF
+ ;
+
+my $limitcount = 0;
+my $argdescs;
+my $reglist = "const struct ccs_reg_desc ccs_reg_desc[] = {\n";
+
+sub name_split($$) {
+ my ($name, $addr) = @_;
+ my $args;
+
+ $name =~ /([^\(]+?)(\(.*)/;
+ ($name, $args) = ($1, $2);
+ $args = [split /,\s*/, $args];
+ foreach my $t (@$args) {
+ $t =~ s/[\(\)]//g;
+ $t =~ s/\//\\\//g;
+ }
+
+ return ($name, $addr, $args);
+}
+
+sub tabconv($) {
+ $_ = shift;
+
+ my @l = split "\n", $_;
+
+ map {
+ s/ {8,8}/\t/g;
+ s/\t\K +//;
+ } @l;
+
+ return (join "\n", @l) . "\n";
+}
+
+sub elem_size(@) {
+ my @flags = @_;
+
+ return 2 if grep /^16$/, @flags;
+ return 4 if grep /^32$/, @flags;
+ return 1;
+}
+
+sub arr_size($) {
+ my $this = $_[0];
+ my $size = $this->{elsize};
+ my $h = $this->{argparams};
+
+ foreach my $arg (@{$this->{args}}) {
+ my $apref = $h->{$arg};
+
+ $size *= $apref->{max} - $apref->{min} + 1;
+ }
+
+ return $size;
+}
+
+sub print_args($$$) {
+ my ($this, $postfix, $is_same_reg) = @_;
+ my ($args, $argparams, $name) =
+ ($this->{args}, $this->{argparams}, $this->{name});
+ my $varname = "ccs_reg_arg_" . (lc $name) . $postfix;
+ my @mins;
+ my @sorted_args = @{$this->{sorted_args}};
+ my $lim_arg;
+ my $size = arr_size($this);
+
+ $argdescs .= "static const struct ccs_reg_arg " . $varname . "[] = {\n";
+
+ foreach my $sorted_arg (@sorted_args) {
+ push @mins, $argparams->{$sorted_arg}->{min};
+ }
+
+ foreach my $sorted_arg (@sorted_args) {
+ my $h = $argparams->{$sorted_arg};
+
+ $argdescs .= "\t{ \"$sorted_arg\", $h->{min}, $h->{max}, $h->{elsize} },\n";
+
+ $lim_arg .= defined $lim_arg ? ", $h->{min}" : "$h->{min}";
+ }
+
+ $argdescs .= "};\n\n";
+
+ $reglist .= "\t{ CCS_R_" . (uc $name) . "(" . (join ",", (@mins)) .
+ "), $size, sizeof($varname) / sizeof(*$varname)," .
+ " \"" . (lc $name) . "\", $varname },\n";
+
+ print $LC tabconv sprintf "\t{ CCS_R_" . (uc $name) . "($lim_arg), " .
+ $size . ", " . ($is_same_reg ? "CCS_L_FL_SAME_REG" : "0") .
+ ", \"$name" . (defined $this->{discontig} ? " $lim_arg" : "") . "\" },\n"
+ if is_limit_reg $this->{base_addr};
+}
+
+my $hdr_data;
+
+while (<$R>) {
+ chop;
+ s/^\s*//;
+ next if /^[#;]/ || /^$/;
+ if (s/^-\s*//) {
+ if (s/^b\s*//) {
+ my ($bit, $addr) = split /\t+/;
+ $bit = uc $bit;
+ $hdr_data .= sprintf "#define %-62s %s", "CCS_" . (uc ${this{name}}) ."_$bit", bit_def($addr) . "\n";
+ } elsif (s/^f\s*//) {
+ s/[,\.-]/_/g;
+ my @a = split /\s+/;
+ my ($msb, $lsb, $this_field) = reverse @a;
+ @a = ( { "name" => "SHIFT", "addr" => $lsb, "fmt" => "%uU", },
+ { "name" => "MASK", "addr" => (1 << ($msb + 1)) - 1 - ((1 << $lsb) - 1), "fmt" => "0x%" . join(".", ($this{"elsize"} >> 2) x 2) . "x" } );
+ $this{"field"} = $this_field;
+ foreach my $ar (@a) {
+ #print $ar->{fmt}."\n";
+ $hdr_data .= sprintf "#define %-62s " . $ar->{"fmt"} . "\n", "CCS_" . (uc $this{"name"}) . (defined $this_field ? "_" . uc $this_field : "") . "_" . $ar->{"name"}, $ar->{"addr"} . "\n";
+ }
+ } elsif (s/^e\s*//) {
+ s/[,\.-]/_/g;
+ my ($enum, $addr) = split /\s+/;
+ $enum = uc $enum;
+ $hdr_data .= sprintf "#define %-62s %s", "CCS_" . (uc ${this{name}}) . (defined $this{"field"} ? "_" . uc $this{"field"} : "") ."_$enum", $addr . ($addr =~ /0x/i ? "" : "U") . "\n";
+ } elsif (s/^l\s*//) {
+ my ($arg, $min, $max, $elsize, @discontig) = split /\s+/;
+ my $size;
+
+ foreach my $num ($min, $max) {
+ $num = hex $num if $num =~ /0x/i;
+ }
+
+ $hdr_data .= sprintf "#define %-62s %s", "CCS_LIM_" . (uc ${this{name}} . "_MIN_$arg"), $min . ($min =~ /0x/i ? "" : "U") . "\n";
+ $hdr_data .= sprintf "#define %-62s %s", "CCS_LIM_" . (uc ${this{name}} . "_MAX_$arg"), $max . ($max =~ /0x/i ? "" : "U") . "\n";
+
+ my $h = $this{argparams};
+
+ $h->{$arg} = { "min" => $min,
+ "max" => $max,
+ "elsize" => $elsize =~ /^0x/ ? hex $elsize : $elsize,
+ "discontig" => \@discontig };
+
+ $this{discontig} = $arg if @discontig;
+
+ next if $#{$this{args}} + 1 != scalar keys %{$this{argparams}};
+
+ my $reg_formula = "($this{addr}";
+ my $lim_formula;
+
+ foreach my $arg (@{$this{args}}) {
+ my $d = $h->{$arg}->{discontig};
+ my $times = $h->{$arg}->{elsize} != 1 ?
+ " * " . $h->{$arg}->{elsize} : "";
+
+ if (@$d) {
+ my ($lim, $offset) = split /,/, $d->[0];
+
+ $reg_formula .= " + (($arg) < $lim ? ($arg)$times : $offset + (($arg) - $lim)$times)";
+ } else {
+ $reg_formula .= " + ($arg)$times";
+ }
+
+ $lim_formula .= (defined $lim_formula ? " + " : "") . "($arg)$times";
+ }
+
+ $reg_formula .= ")\n";
+ $lim_formula =~ s/^\(([a-z0-9]+)\)$/$1/i;
+
+ print $H tabconv sprintf("#define %-62s %s", "CCS_R_" . (uc $this{name}) .
+ $this{arglist}, $reg_formula);
+
+ print $H tabconv $hdr_data;
+ undef $hdr_data;
+
+ # Sort arguments in descending order by size
+ @{$this{sorted_args}} = sort {
+ $h->{$a}->{elsize} <= $h->{$b}->{elsize}
+ } @{$this{args}};
+
+ if (defined $this{discontig}) {
+ my $da = $this{argparams}->{$this{discontig}};
+ my ($first_discontig) = split /,/, $da->{discontig}->[0];
+ my $max = $da->{max};
+
+ $da->{max} = $first_discontig - 1;
+ print_args(\%this, "", 0);
+
+ $da->{min} = $da->{max} + 1;
+ $da->{max} = $max;
+ print_args(\%this, $first_discontig, 1);
+ } else {
+ print_args(\%this, "", 0);
+ }
+
+ next unless is_limit_reg $this{base_addr};
+
+ print $LH tabconv sprintf "#define %-63s%s\n",
+ "CCS_L_" . (uc $this{name}) . "_OFFSET(" .
+ (join ", ", @{$this{args}}) . ")", "($lim_formula)";
+ }
+
+ if (! @{$this{args}}) {
+ print $H tabconv($hdr_data);
+ undef $hdr_data;
+ }
+
+ next;
+ }
+
+ my ($name, $addr, @flags) = split /\t+/, $_;
+ my $args = [];
+
+ my $sp;
+
+ ($name, $addr, $args) = name_split($name, $addr) if /\(.*\)/;
+
+ $name =~ s/[,\.-]/_/g;
+
+ my $flagstring = "";
+ my $size = elem_size(@flags);
+ $flagstring .= "| CCS_FL_16BIT " if $size eq "2";
+ $flagstring .= "| CCS_FL_32BIT " if $size eq "4";
+ $flagstring .= "| CCS_FL_FLOAT_IREAL " if grep /^float_ireal$/, @flags;
+ $flagstring .= "| CCS_FL_IREAL " if grep /^ireal$/, @flags;
+ $flagstring =~ s/^\| //;
+ $flagstring =~ s/ $//;
+ $flagstring = "($flagstring)" if $flagstring =~ /\|/;
+ my $base_addr = $addr;
+ $addr = "($addr | $flagstring)" if $flagstring ne "";
+
+ my $arglist = @$args ? "(" . (join ", ", @$args) . ")" : "";
+ $hdr_data .= sprintf "#define %-62s %s\n", "CCS_R_" . (uc $name), $addr
+ if !@$args;
+
+ $name =~ s/\(.*//;
+
+ %this = ( name => $name,
+ addr => $addr,
+ base_addr => $base_addr,
+ argparams => {},
+ args => $args,
+ arglist => $arglist,
+ elsize => $size,
+ );
+
+ if (!@$args) {
+ $reglist .= "\t{ CCS_R_" . (uc $name) . ", 1, 0, \"" . (lc $name) . "\", NULL },\n";
+ print $H tabconv $hdr_data;
+ undef $hdr_data;
+
+ print $LC tabconv sprintf "\t{ CCS_R_" . (uc $name) . ", " .
+ $this{elsize} . ", 0, \"$name\" },\n"
+ if is_limit_reg $this{base_addr};
+ }
+
+ print $LH tabconv sprintf "#define %-63s%s\n",
+ "CCS_L_" . (uc $this{name}), $limitcount++
+ if is_limit_reg $this{base_addr};
+}
+
+if (defined $A) {
+ print $A $argdescs, $reglist;
+
+ print $A "\t{ 0 }\n";
+
+ print $A "};\n";
+}
+
+print $H "\n#endif /* __${uc_header}__ */\n";
+
+print $LH tabconv sprintf "#define %-63s%s\n", "CCS_L_LAST", $limitcount;
+
+print $LH "\n#endif /* __${uc_limith}__ */\n";
+
+print $LC "\t{ 0 } /* Guardian */\n";
+print $LC "};\n";
+
+close($R);
+close($H);
+close($A) if defined $A;
+close($LC);
+close($LH);
diff --git a/Documentation/driver-api/media/drivers/contributors.rst b/Documentation/driver-api/media/drivers/contributors.rst
new file mode 100644
index 0000000000..f23b6e6faf
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/contributors.rst
@@ -0,0 +1,131 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Contributors
+============
+
+.. note::
+
+ This documentation is outdated. There are several other DVB contributors
+ that aren't listed below.
+
+Thanks go to the following people for patches and contributions:
+
+- Michael Hunold <m.hunold@gmx.de>
+
+ - for the initial saa7146 driver and its recent overhaul
+
+- Christian Theiss
+
+ - for his work on the initial Linux DVB driver
+
+- Marcus Metzler <mocm@metzlerbros.de> and
+ Ralph Metzler <rjkm@metzlerbros.de>
+
+ - for their continuing work on the DVB driver
+
+- Michael Holzt <kju@debian.org>
+
+ - for his contributions to the dvb-net driver
+
+- Diego Picciani <d.picciani@novacomp.it>
+
+ - for CyberLogin for Linux which allows logging onto EON
+ (in case you are wondering where CyberLogin is, EON changed its login
+ procedure and CyberLogin is no longer used.)
+
+- Martin Schaller <martin@smurf.franken.de>
+
+ - for patching the cable card decoder driver
+
+- Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>
+
+ - for various fixes regarding tuning, OSD and CI stuff and his work on VDR
+
+- Steve Brown <sbrown@cortland.com>
+
+ - for his AFC kernel thread
+
+- Christoph Martin <martin@uni-mainz.de>
+
+ - for his LIRC infrared handler
+
+- Andreas Oberritter <obi@linuxtv.org>,
+ Dennis Noermann <dennis.noermann@noernet.de>,
+ Felix Domke <tmbinc@elitedvb.net>,
+ Florian Schirmer <jolt@tuxbox.org>,
+ Ronny Strutz <3des@elitedvb.de>,
+ Wolfram Joost <dbox2@frokaschwei.de>
+ and all the other dbox2 people
+
+ - for many bugfixes in the generic DVB Core, frontend drivers and
+ their work on the dbox2 port of the DVB driver
+
+- Oliver Endriss <o.endriss@gmx.de>
+
+ - for many bugfixes
+
+- Andrew de Quincey <adq_dvb@lidskialf.net>
+
+ - for the tda1004x frontend driver, and various bugfixes
+
+- Peter Schildmann <peter.schildmann@web.de>
+
+ - for the driver for the Technisat SkyStar2 PCI DVB card
+
+- Vadim Catana <skystar@moldova.cc>,
+ Roberto Ragusa <r.ragusa@libero.it> and
+ Augusto Cardoso <augusto@carhil.net>
+
+ - for all the work for the FlexCopII chipset by B2C2,Inc.
+
+- Davor Emard <emard@softhome.net>
+
+ - for his work on the budget drivers, the demux code,
+ the module unloading problems, ...
+
+- Hans-Frieder Vogt <hfvogt@arcor.de>
+
+ - for his work on calculating and checking the crc's for the
+ TechnoTrend/Hauppauge DEC driver firmware
+
+- Michael Dreher <michael@5dot1.de> and
+ Andreas 'randy' Weinberger
+
+ - for the support of the Fujitsu-Siemens Activy budget DVB-S
+
+- Kenneth Aafløy <ke-aa@frisurf.no>
+
+ - for adding support for Typhoon DVB-S budget card
+
+- Ernst Peinlich <e.peinlich@inode.at>
+
+ - for tuning/DiSEqC support for the DEC 3000-s
+
+- Peter Beutner <p.beutner@gmx.net>
+
+ - for the IR code for the ttusb-dec driver
+
+- Wilson Michaels <wilsonmichaels@earthlink.net>
+
+ - for the lgdt330x frontend driver, and various bugfixes
+
+- Michael Krufky <mkrufky@linuxtv.org>
+
+ - for maintaining v4l/dvb inter-tree dependencies
+
+- Taylor Jacob <rtjacob@earthlink.net>
+
+ - for the nxt2002 frontend driver
+
+- Jean-Francois Thibert <jeanfrancois@sagetv.com>
+
+ - for the nxt2004 frontend driver
+
+- Kirk Lapray <kirk.lapray@gmail.com>
+
+ - for the or51211 and or51132 frontend drivers, and
+ for merging the nxt2002 and nxt2004 modules into a
+ single nxt200x frontend driver.
+
+(If you think you should be in this list, but you are not, drop a
+line to the DVB mailing list)
diff --git a/Documentation/driver-api/media/drivers/cx2341x-devel.rst b/Documentation/driver-api/media/drivers/cx2341x-devel.rst
new file mode 100644
index 0000000000..97699df6ea
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/cx2341x-devel.rst
@@ -0,0 +1,3685 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+The cx2341x driver
+==================
+
+Memory at cx2341x chips
+-----------------------
+
+This section describes the cx2341x memory map and documents some of the
+register space.
+
+.. note:: the memory long words are little-endian ('intel format').
+
+.. warning::
+
+ This information was figured out from searching through the memory
+ and registers, this information may not be correct and is certainly
+ not complete, and was not derived from anything more than searching
+ through the memory space with commands like:
+
+ .. code-block:: none
+
+ ivtvctl -O min=0x02000000,max=0x020000ff
+
+ So take this as is, I'm always searching for more stuff, it's a large
+ register space :-).
+
+Memory Map
+~~~~~~~~~~
+
+The cx2341x exposes its entire 64M memory space to the PCI host via the PCI BAR0
+(Base Address Register 0). The addresses here are offsets relative to the
+address held in BAR0.
+
+.. code-block:: none
+
+ 0x00000000-0x00ffffff Encoder memory space
+ 0x00000000-0x0003ffff Encode.rom
+ ???-??? MPEG buffer(s)
+ ???-??? Raw video capture buffer(s)
+ ???-??? Raw audio capture buffer(s)
+ ???-??? Display buffers (6 or 9)
+
+ 0x01000000-0x01ffffff Decoder memory space
+ 0x01000000-0x0103ffff Decode.rom
+ ???-??? MPEG buffers(s)
+ 0x0114b000-0x0115afff Audio.rom (deprecated?)
+
+ 0x02000000-0x0200ffff Register Space
+
+Registers
+~~~~~~~~~
+
+The registers occupy the 64k space starting at the 0x02000000 offset from BAR0.
+All of these registers are 32 bits wide.
+
+.. code-block:: none
+
+ DMA Registers 0x000-0xff:
+
+ 0x00 - Control:
+ 0=reset/cancel, 1=read, 2=write, 4=stop
+ 0x04 - DMA status:
+ 1=read busy, 2=write busy, 4=read error, 8=write error, 16=link list error
+ 0x08 - pci DMA pointer for read link list
+ 0x0c - pci DMA pointer for write link list
+ 0x10 - read/write DMA enable:
+ 1=read enable, 2=write enable
+ 0x14 - always 0xffffffff, if set any lower instability occurs, 0x00 crashes
+ 0x18 - ??
+ 0x1c - always 0x20 or 32, smaller values slow down DMA transactions
+ 0x20 - always value of 0x780a010a
+ 0x24-0x3c - usually just random values???
+ 0x40 - Interrupt status
+ 0x44 - Write a bit here and shows up in Interrupt status 0x40
+ 0x48 - Interrupt Mask
+ 0x4C - always value of 0xfffdffff,
+ if changed to 0xffffffff DMA write interrupts break.
+ 0x50 - always 0xffffffff
+ 0x54 - always 0xffffffff (0x4c, 0x50, 0x54 seem like interrupt masks, are
+ 3 processors on chip, Java ones, VPU, SPU, APU, maybe these are the
+ interrupt masks???).
+ 0x60-0x7C - random values
+ 0x80 - first write linked list reg, for Encoder Memory addr
+ 0x84 - first write linked list reg, for pci memory addr
+ 0x88 - first write linked list reg, for length of buffer in memory addr
+ (|0x80000000 or this for last link)
+ 0x8c-0xdc - rest of write linked list reg, 8 sets of 3 total, DMA goes here
+ from linked list addr in reg 0x0c, firmware must push through or
+ something.
+ 0xe0 - first (and only) read linked list reg, for pci memory addr
+ 0xe4 - first (and only) read linked list reg, for Decoder memory addr
+ 0xe8 - first (and only) read linked list reg, for length of buffer
+ 0xec-0xff - Nothing seems to be in these registers, 0xec-f4 are 0x00000000.
+
+Memory locations for Encoder Buffers 0x700-0x7ff:
+
+These registers show offsets of memory locations pertaining to each
+buffer area used for encoding, have to shift them by <<1 first.
+
+- 0x07F8: Encoder SDRAM refresh
+- 0x07FC: Encoder SDRAM pre-charge
+
+Memory locations for Decoder Buffers 0x800-0x8ff:
+
+These registers show offsets of memory locations pertaining to each
+buffer area used for decoding, have to shift them by <<1 first.
+
+- 0x08F8: Decoder SDRAM refresh
+- 0x08FC: Decoder SDRAM pre-charge
+
+Other memory locations:
+
+- 0x2800: Video Display Module control
+- 0x2D00: AO (audio output?) control
+- 0x2D24: Bytes Flushed
+- 0x7000: LSB I2C write clock bit (inverted)
+- 0x7004: LSB I2C write data bit (inverted)
+- 0x7008: LSB I2C read clock bit
+- 0x700c: LSB I2C read data bit
+- 0x9008: GPIO get input state
+- 0x900c: GPIO set output state
+- 0x9020: GPIO direction (Bit7 (GPIO 0..7) - 0:input, 1:output)
+- 0x9050: SPU control
+- 0x9054: Reset HW blocks
+- 0x9058: VPU control
+- 0xA018: Bit6: interrupt pending?
+- 0xA064: APU command
+
+
+Interrupt Status Register
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The definition of the bits in the interrupt status register 0x0040, and the
+interrupt mask 0x0048. If a bit is cleared in the mask, then we want our ISR to
+execute.
+
+- bit 31 Encoder Start Capture
+- bit 30 Encoder EOS
+- bit 29 Encoder VBI capture
+- bit 28 Encoder Video Input Module reset event
+- bit 27 Encoder DMA complete
+- bit 24 Decoder audio mode change detection event (through event notification)
+- bit 22 Decoder data request
+- bit 20 Decoder DMA complete
+- bit 19 Decoder VBI re-insertion
+- bit 18 Decoder DMA err (linked-list bad)
+
+Missing documentation
+---------------------
+
+- Encoder API post(?)
+- Decoder API post(?)
+- Decoder VTRACE event
+
+
+The cx2341x firmware upload
+---------------------------
+
+This document describes how to upload the cx2341x firmware to the card.
+
+How to find
+~~~~~~~~~~~
+
+See the web pages of the various projects that uses this chip for information
+on how to obtain the firmware.
+
+The firmware stored in a Windows driver can be detected as follows:
+
+- Each firmware image is 256k bytes.
+- The 1st 32-bit word of the Encoder image is 0x0000da7
+- The 1st 32-bit word of the Decoder image is 0x00003a7
+- The 2nd 32-bit word of both images is 0xaa55bb66
+
+How to load
+~~~~~~~~~~~
+
+- Issue the FWapi command to stop the encoder if it is running. Wait for the
+ command to complete.
+- Issue the FWapi command to stop the decoder if it is running. Wait for the
+ command to complete.
+- Issue the I2C command to the digitizer to stop emitting VSYNC events.
+- Issue the FWapi command to halt the encoder's firmware.
+- Sleep for 10ms.
+- Issue the FWapi command to halt the decoder's firmware.
+- Sleep for 10ms.
+- Write 0x00000000 to register 0x2800 to stop the Video Display Module.
+- Write 0x00000005 to register 0x2D00 to stop the AO (audio output?).
+- Write 0x00000000 to register 0xA064 to ping? the APU.
+- Write 0xFFFFFFFE to register 0x9058 to stop the VPU.
+- Write 0xFFFFFFFF to register 0x9054 to reset the HW blocks.
+- Write 0x00000001 to register 0x9050 to stop the SPU.
+- Sleep for 10ms.
+- Write 0x0000001A to register 0x07FC to init the Encoder SDRAM's pre-charge.
+- Write 0x80000640 to register 0x07F8 to init the Encoder SDRAM's refresh to 1us.
+- Write 0x0000001A to register 0x08FC to init the Decoder SDRAM's pre-charge.
+- Write 0x80000640 to register 0x08F8 to init the Decoder SDRAM's refresh to 1us.
+- Sleep for 512ms. (600ms is recommended)
+- Transfer the encoder's firmware image to offset 0 in Encoder memory space.
+- Transfer the decoder's firmware image to offset 0 in Decoder memory space.
+- Use a read-modify-write operation to Clear bit 0 of register 0x9050 to
+ re-enable the SPU.
+- Sleep for 1 second.
+- Use a read-modify-write operation to Clear bits 3 and 0 of register 0x9058
+ to re-enable the VPU.
+- Sleep for 1 second.
+- Issue status API commands to both firmware images to verify.
+
+
+How to call the firmware API
+----------------------------
+
+The preferred calling convention is known as the firmware mailbox. The
+mailboxes are basically a fixed length array that serves as the call-stack.
+
+Firmware mailboxes can be located by searching the encoder and decoder memory
+for a 16 byte signature. That signature will be located on a 256-byte boundary.
+
+Signature:
+
+.. code-block:: none
+
+ 0x78, 0x56, 0x34, 0x12, 0x12, 0x78, 0x56, 0x34,
+ 0x34, 0x12, 0x78, 0x56, 0x56, 0x34, 0x12, 0x78
+
+The firmware implements 20 mailboxes of 20 32-bit words. The first 10 are
+reserved for API calls. The second 10 are used by the firmware for event
+notification.
+
+ ====== =================
+ Index Name
+ ====== =================
+ 0 Flags
+ 1 Command
+ 2 Return value
+ 3 Timeout
+ 4-19 Parameter/Result
+ ====== =================
+
+
+The flags are defined in the following table. The direction is from the
+perspective of the firmware.
+
+ ==== ========== ============================================
+ Bit Direction Purpose
+ ==== ========== ============================================
+ 2 O Firmware has processed the command.
+ 1 I Driver has finished setting the parameters.
+ 0 I Driver is using this mailbox.
+ ==== ========== ============================================
+
+The command is a 32-bit enumerator. The API specifics may be found in this
+chapter.
+
+The return value is a 32-bit enumerator. Only two values are currently defined:
+
+- 0=success
+- -1=command undefined.
+
+There are 16 parameters/results 32-bit fields. The driver populates these fields
+with values for all the parameters required by the call. The driver overwrites
+these fields with result values returned by the call.
+
+The timeout value protects the card from a hung driver thread. If the driver
+doesn't handle the completed call within the timeout specified, the firmware
+will reset that mailbox.
+
+To make an API call, the driver iterates over each mailbox looking for the
+first one available (bit 0 has been cleared). The driver sets that bit, fills
+in the command enumerator, the timeout value and any required parameters. The
+driver then sets the parameter ready bit (bit 1). The firmware scans the
+mailboxes for pending commands, processes them, sets the result code, populates
+the result value array with that call's return values and sets the call
+complete bit (bit 2). Once bit 2 is set, the driver should retrieve the results
+and clear all the flags. If the driver does not perform this task within the
+time set in the timeout register, the firmware will reset that mailbox.
+
+Event notifications are sent from the firmware to the host. The host tells the
+firmware which events it is interested in via an API call. That call tells the
+firmware which notification mailbox to use. The firmware signals the host via
+an interrupt. Only the 16 Results fields are used, the Flags, Command, Return
+value and Timeout words are not used.
+
+
+OSD firmware API description
+----------------------------
+
+.. note:: this API is part of the decoder firmware, so it's cx23415 only.
+
+
+
+CX2341X_OSD_GET_FRAMEBUFFER
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 65/0x41
+
+Description
+^^^^^^^^^^^
+
+Return base and length of contiguous OSD memory.
+
+Result[0]
+^^^^^^^^^
+
+OSD base address
+
+Result[1]
+^^^^^^^^^
+
+OSD length
+
+
+
+CX2341X_OSD_GET_PIXEL_FORMAT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 66/0x42
+
+Description
+^^^^^^^^^^^
+
+Query OSD format
+
+Result[0]
+^^^^^^^^^
+
+0=8bit index
+1=16bit RGB 5:6:5
+2=16bit ARGB 1:5:5:5
+3=16bit ARGB 1:4:4:4
+4=32bit ARGB 8:8:8:8
+
+
+
+CX2341X_OSD_SET_PIXEL_FORMAT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 67/0x43
+
+Description
+^^^^^^^^^^^
+
+Assign pixel format
+
+Param[0]
+^^^^^^^^
+
+- 0=8bit index
+- 1=16bit RGB 5:6:5
+- 2=16bit ARGB 1:5:5:5
+- 3=16bit ARGB 1:4:4:4
+- 4=32bit ARGB 8:8:8:8
+
+
+
+CX2341X_OSD_GET_STATE
+~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 68/0x44
+
+Description
+^^^^^^^^^^^
+
+Query OSD state
+
+Result[0]
+^^^^^^^^^
+
+- Bit 0 0=off, 1=on
+- Bits 1:2 alpha control
+- Bits 3:5 pixel format
+
+
+
+CX2341X_OSD_SET_STATE
+~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 69/0x45
+
+Description
+^^^^^^^^^^^
+
+OSD switch
+
+Param[0]
+^^^^^^^^
+
+0=off, 1=on
+
+
+
+CX2341X_OSD_GET_OSD_COORDS
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 70/0x46
+
+Description
+^^^^^^^^^^^
+
+Retrieve coordinates of OSD area blended with video
+
+Result[0]
+^^^^^^^^^
+
+OSD buffer address
+
+Result[1]
+^^^^^^^^^
+
+Stride in pixels
+
+Result[2]
+^^^^^^^^^
+
+Lines in OSD buffer
+
+Result[3]
+^^^^^^^^^
+
+Horizontal offset in buffer
+
+Result[4]
+^^^^^^^^^
+
+Vertical offset in buffer
+
+
+
+CX2341X_OSD_SET_OSD_COORDS
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 71/0x47
+
+Description
+^^^^^^^^^^^
+
+Assign the coordinates of the OSD area to blend with video
+
+Param[0]
+^^^^^^^^
+
+buffer address
+
+Param[1]
+^^^^^^^^
+
+buffer stride in pixels
+
+Param[2]
+^^^^^^^^
+
+lines in buffer
+
+Param[3]
+^^^^^^^^
+
+horizontal offset
+
+Param[4]
+^^^^^^^^
+
+vertical offset
+
+
+
+CX2341X_OSD_GET_SCREEN_COORDS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 72/0x48
+
+Description
+^^^^^^^^^^^
+
+Retrieve OSD screen area coordinates
+
+Result[0]
+^^^^^^^^^
+
+top left horizontal offset
+
+Result[1]
+^^^^^^^^^
+
+top left vertical offset
+
+Result[2]
+^^^^^^^^^
+
+bottom right horizontal offset
+
+Result[3]
+^^^^^^^^^
+
+bottom right vertical offset
+
+
+
+CX2341X_OSD_SET_SCREEN_COORDS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 73/0x49
+
+Description
+^^^^^^^^^^^
+
+Assign the coordinates of the screen area to blend with video
+
+Param[0]
+^^^^^^^^
+
+top left horizontal offset
+
+Param[1]
+^^^^^^^^
+
+top left vertical offset
+
+Param[2]
+^^^^^^^^
+
+bottom left horizontal offset
+
+Param[3]
+^^^^^^^^
+
+bottom left vertical offset
+
+
+
+CX2341X_OSD_GET_GLOBAL_ALPHA
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 74/0x4A
+
+Description
+^^^^^^^^^^^
+
+Retrieve OSD global alpha
+
+Result[0]
+^^^^^^^^^
+
+global alpha: 0=off, 1=on
+
+Result[1]
+^^^^^^^^^
+
+bits 0:7 global alpha
+
+
+
+CX2341X_OSD_SET_GLOBAL_ALPHA
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 75/0x4B
+
+Description
+^^^^^^^^^^^
+
+Update global alpha
+
+Param[0]
+^^^^^^^^
+
+global alpha: 0=off, 1=on
+
+Param[1]
+^^^^^^^^
+
+global alpha (8 bits)
+
+Param[2]
+^^^^^^^^
+
+local alpha: 0=on, 1=off
+
+
+
+CX2341X_OSD_SET_BLEND_COORDS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 78/0x4C
+
+Description
+^^^^^^^^^^^
+
+Move start of blending area within display buffer
+
+Param[0]
+^^^^^^^^
+
+horizontal offset in buffer
+
+Param[1]
+^^^^^^^^
+
+vertical offset in buffer
+
+
+
+CX2341X_OSD_GET_FLICKER_STATE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 79/0x4F
+
+Description
+^^^^^^^^^^^
+
+Retrieve flicker reduction module state
+
+Result[0]
+^^^^^^^^^
+
+flicker state: 0=off, 1=on
+
+
+
+CX2341X_OSD_SET_FLICKER_STATE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 80/0x50
+
+Description
+^^^^^^^^^^^
+
+Set flicker reduction module state
+
+Param[0]
+^^^^^^^^
+
+State: 0=off, 1=on
+
+
+
+CX2341X_OSD_BLT_COPY
+~~~~~~~~~~~~~~~~~~~~
+
+Enum: 82/0x52
+
+Description
+^^^^^^^^^^^
+
+BLT copy
+
+Param[0]
+^^^^^^^^
+
+.. code-block:: none
+
+ '0000' zero
+ '0001' ~destination AND ~source
+ '0010' ~destination AND source
+ '0011' ~destination
+ '0100' destination AND ~source
+ '0101' ~source
+ '0110' destination XOR source
+ '0111' ~destination OR ~source
+ '1000' ~destination AND ~source
+ '1001' destination XNOR source
+ '1010' source
+ '1011' ~destination OR source
+ '1100' destination
+ '1101' destination OR ~source
+ '1110' destination OR source
+ '1111' one
+
+
+Param[1]
+^^^^^^^^
+
+Resulting alpha blending
+
+- '01' source_alpha
+- '10' destination_alpha
+- '11' source_alpha*destination_alpha+1
+ (zero if both source and destination alpha are zero)
+
+Param[2]
+^^^^^^^^
+
+.. code-block:: none
+
+ '00' output_pixel = source_pixel
+
+ '01' if source_alpha=0:
+ output_pixel = destination_pixel
+ if 256 > source_alpha > 1:
+ output_pixel = ((source_alpha + 1)*source_pixel +
+ (255 - source_alpha)*destination_pixel)/256
+
+ '10' if destination_alpha=0:
+ output_pixel = source_pixel
+ if 255 > destination_alpha > 0:
+ output_pixel = ((255 - destination_alpha)*source_pixel +
+ (destination_alpha + 1)*destination_pixel)/256
+
+ '11' if source_alpha=0:
+ source_temp = 0
+ if source_alpha=255:
+ source_temp = source_pixel*256
+ if 255 > source_alpha > 0:
+ source_temp = source_pixel*(source_alpha + 1)
+ if destination_alpha=0:
+ destination_temp = 0
+ if destination_alpha=255:
+ destination_temp = destination_pixel*256
+ if 255 > destination_alpha > 0:
+ destination_temp = destination_pixel*(destination_alpha + 1)
+ output_pixel = (source_temp + destination_temp)/256
+
+Param[3]
+^^^^^^^^
+
+width
+
+Param[4]
+^^^^^^^^
+
+height
+
+Param[5]
+^^^^^^^^
+
+destination pixel mask
+
+Param[6]
+^^^^^^^^
+
+destination rectangle start address
+
+Param[7]
+^^^^^^^^
+
+destination stride in dwords
+
+Param[8]
+^^^^^^^^
+
+source stride in dwords
+
+Param[9]
+^^^^^^^^
+
+source rectangle start address
+
+
+
+CX2341X_OSD_BLT_FILL
+~~~~~~~~~~~~~~~~~~~~
+
+Enum: 83/0x53
+
+Description
+^^^^^^^^^^^
+
+BLT fill color
+
+Param[0]
+^^^^^^^^
+
+Same as Param[0] on API 0x52
+
+Param[1]
+^^^^^^^^
+
+Same as Param[1] on API 0x52
+
+Param[2]
+^^^^^^^^
+
+Same as Param[2] on API 0x52
+
+Param[3]
+^^^^^^^^
+
+width
+
+Param[4]
+^^^^^^^^
+
+height
+
+Param[5]
+^^^^^^^^
+
+destination pixel mask
+
+Param[6]
+^^^^^^^^
+
+destination rectangle start address
+
+Param[7]
+^^^^^^^^
+
+destination stride in dwords
+
+Param[8]
+^^^^^^^^
+
+color fill value
+
+
+
+CX2341X_OSD_BLT_TEXT
+~~~~~~~~~~~~~~~~~~~~
+
+Enum: 84/0x54
+
+Description
+^^^^^^^^^^^
+
+BLT for 8 bit alpha text source
+
+Param[0]
+^^^^^^^^
+
+Same as Param[0] on API 0x52
+
+Param[1]
+^^^^^^^^
+
+Same as Param[1] on API 0x52
+
+Param[2]
+^^^^^^^^
+
+Same as Param[2] on API 0x52
+
+Param[3]
+^^^^^^^^
+
+width
+
+Param[4]
+^^^^^^^^
+
+height
+
+Param[5]
+^^^^^^^^
+
+destination pixel mask
+
+Param[6]
+^^^^^^^^
+
+destination rectangle start address
+
+Param[7]
+^^^^^^^^
+
+destination stride in dwords
+
+Param[8]
+^^^^^^^^
+
+source stride in dwords
+
+Param[9]
+^^^^^^^^
+
+source rectangle start address
+
+Param[10]
+^^^^^^^^^
+
+color fill value
+
+
+
+CX2341X_OSD_SET_FRAMEBUFFER_WINDOW
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 86/0x56
+
+Description
+^^^^^^^^^^^
+
+Positions the main output window on the screen. The coordinates must be
+such that the entire window fits on the screen.
+
+Param[0]
+^^^^^^^^
+
+window width
+
+Param[1]
+^^^^^^^^
+
+window height
+
+Param[2]
+^^^^^^^^
+
+top left window corner horizontal offset
+
+Param[3]
+^^^^^^^^
+
+top left window corner vertical offset
+
+
+
+CX2341X_OSD_SET_CHROMA_KEY
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 96/0x60
+
+Description
+^^^^^^^^^^^
+
+Chroma key switch and color
+
+Param[0]
+^^^^^^^^
+
+state: 0=off, 1=on
+
+Param[1]
+^^^^^^^^
+
+color
+
+
+
+CX2341X_OSD_GET_ALPHA_CONTENT_INDEX
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 97/0x61
+
+Description
+^^^^^^^^^^^
+
+Retrieve alpha content index
+
+Result[0]
+^^^^^^^^^
+
+alpha content index, Range 0:15
+
+
+
+CX2341X_OSD_SET_ALPHA_CONTENT_INDEX
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 98/0x62
+
+Description
+^^^^^^^^^^^
+
+Assign alpha content index
+
+Param[0]
+^^^^^^^^
+
+alpha content index, range 0:15
+
+
+Encoder firmware API description
+--------------------------------
+
+CX2341X_ENC_PING_FW
+~~~~~~~~~~~~~~~~~~~
+
+Enum: 128/0x80
+
+Description
+^^^^^^^^^^^
+
+Does nothing. Can be used to check if the firmware is responding.
+
+
+
+CX2341X_ENC_START_CAPTURE
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 129/0x81
+
+Description
+^^^^^^^^^^^
+
+Commences the capture of video, audio and/or VBI data. All encoding
+parameters must be initialized prior to this API call. Captures frames
+continuously or until a predefined number of frames have been captured.
+
+Param[0]
+^^^^^^^^
+
+Capture stream type:
+
+ - 0=MPEG
+ - 1=Raw
+ - 2=Raw passthrough
+ - 3=VBI
+
+
+Param[1]
+^^^^^^^^
+
+Bitmask:
+
+ - Bit 0 when set, captures YUV
+ - Bit 1 when set, captures PCM audio
+ - Bit 2 when set, captures VBI (same as param[0]=3)
+ - Bit 3 when set, the capture destination is the decoder
+ (same as param[0]=2)
+ - Bit 4 when set, the capture destination is the host
+
+.. note:: this parameter is only meaningful for RAW capture type.
+
+
+
+CX2341X_ENC_STOP_CAPTURE
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 130/0x82
+
+Description
+^^^^^^^^^^^
+
+Ends a capture in progress
+
+Param[0]
+^^^^^^^^
+
+- 0=stop at end of GOP (generates IRQ)
+- 1=stop immediate (no IRQ)
+
+Param[1]
+^^^^^^^^
+
+Stream type to stop, see param[0] of API 0x81
+
+Param[2]
+^^^^^^^^
+
+Subtype, see param[1] of API 0x81
+
+
+
+CX2341X_ENC_SET_AUDIO_ID
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 137/0x89
+
+Description
+^^^^^^^^^^^
+
+Assigns the transport stream ID of the encoded audio stream
+
+Param[0]
+^^^^^^^^
+
+Audio Stream ID
+
+
+
+CX2341X_ENC_SET_VIDEO_ID
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 139/0x8B
+
+Description
+^^^^^^^^^^^
+
+Set video transport stream ID
+
+Param[0]
+^^^^^^^^
+
+Video stream ID
+
+
+
+CX2341X_ENC_SET_PCR_ID
+~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 141/0x8D
+
+Description
+^^^^^^^^^^^
+
+Assigns the transport stream ID for PCR packets
+
+Param[0]
+^^^^^^^^
+
+PCR Stream ID
+
+
+
+CX2341X_ENC_SET_FRAME_RATE
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 143/0x8F
+
+Description
+^^^^^^^^^^^
+
+Set video frames per second. Change occurs at start of new GOP.
+
+Param[0]
+^^^^^^^^
+
+- 0=30fps
+- 1=25fps
+
+
+
+CX2341X_ENC_SET_FRAME_SIZE
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 145/0x91
+
+Description
+^^^^^^^^^^^
+
+Select video stream encoding resolution.
+
+Param[0]
+^^^^^^^^
+
+Height in lines. Default 480
+
+Param[1]
+^^^^^^^^
+
+Width in pixels. Default 720
+
+
+
+CX2341X_ENC_SET_BIT_RATE
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 149/0x95
+
+Description
+^^^^^^^^^^^
+
+Assign average video stream bitrate.
+
+Param[0]
+^^^^^^^^
+
+0=variable bitrate, 1=constant bitrate
+
+Param[1]
+^^^^^^^^
+
+bitrate in bits per second
+
+Param[2]
+^^^^^^^^
+
+peak bitrate in bits per second, divided by 400
+
+Param[3]
+^^^^^^^^
+
+Mux bitrate in bits per second, divided by 400. May be 0 (default).
+
+Param[4]
+^^^^^^^^
+
+Rate Control VBR Padding
+
+Param[5]
+^^^^^^^^
+
+VBV Buffer used by encoder
+
+.. note::
+
+ #) Param\[3\] and Param\[4\] seem to be always 0
+ #) Param\[5\] doesn't seem to be used.
+
+
+
+CX2341X_ENC_SET_GOP_PROPERTIES
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 151/0x97
+
+Description
+^^^^^^^^^^^
+
+Setup the GOP structure
+
+Param[0]
+^^^^^^^^
+
+GOP size (maximum is 34)
+
+Param[1]
+^^^^^^^^
+
+Number of B frames between the I and P frame, plus 1.
+For example: IBBPBBPBBPBB --> GOP size: 12, number of B frames: 2+1 = 3
+
+.. note::
+
+ GOP size must be a multiple of (B-frames + 1).
+
+
+
+CX2341X_ENC_SET_ASPECT_RATIO
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 153/0x99
+
+Description
+^^^^^^^^^^^
+
+Sets the encoding aspect ratio. Changes in the aspect ratio take effect
+at the start of the next GOP.
+
+Param[0]
+^^^^^^^^
+
+- '0000' forbidden
+- '0001' 1:1 square
+- '0010' 4:3
+- '0011' 16:9
+- '0100' 2.21:1
+- '0101' to '1111' reserved
+
+
+
+CX2341X_ENC_SET_DNR_FILTER_MODE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 155/0x9B
+
+Description
+^^^^^^^^^^^
+
+Assign Dynamic Noise Reduction operating mode
+
+Param[0]
+^^^^^^^^
+
+Bit0: Spatial filter, set=auto, clear=manual
+Bit1: Temporal filter, set=auto, clear=manual
+
+Param[1]
+^^^^^^^^
+
+Median filter:
+
+- 0=Disabled
+- 1=Horizontal
+- 2=Vertical
+- 3=Horiz/Vert
+- 4=Diagonal
+
+
+
+CX2341X_ENC_SET_DNR_FILTER_PROPS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 157/0x9D
+
+Description
+^^^^^^^^^^^
+
+These Dynamic Noise Reduction filter values are only meaningful when
+the respective filter is set to "manual" (See API 0x9B)
+
+Param[0]
+^^^^^^^^
+
+Spatial filter: default 0, range 0:15
+
+Param[1]
+^^^^^^^^
+
+Temporal filter: default 0, range 0:31
+
+
+
+CX2341X_ENC_SET_CORING_LEVELS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 159/0x9F
+
+Description
+^^^^^^^^^^^
+
+Assign Dynamic Noise Reduction median filter properties.
+
+Param[0]
+^^^^^^^^
+
+Threshold above which the luminance median filter is enabled.
+Default: 0, range 0:255
+
+Param[1]
+^^^^^^^^
+
+Threshold below which the luminance median filter is enabled.
+Default: 255, range 0:255
+
+Param[2]
+^^^^^^^^
+
+Threshold above which the chrominance median filter is enabled.
+Default: 0, range 0:255
+
+Param[3]
+^^^^^^^^
+
+Threshold below which the chrominance median filter is enabled.
+Default: 255, range 0:255
+
+
+
+CX2341X_ENC_SET_SPATIAL_FILTER_TYPE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 161/0xA1
+
+Description
+^^^^^^^^^^^
+
+Assign spatial prefilter parameters
+
+Param[0]
+^^^^^^^^
+
+Luminance filter
+
+- 0=Off
+- 1=1D Horizontal
+- 2=1D Vertical
+- 3=2D H/V Separable (default)
+- 4=2D Symmetric non-separable
+
+Param[1]
+^^^^^^^^
+
+Chrominance filter
+
+- 0=Off
+- 1=1D Horizontal (default)
+
+
+
+CX2341X_ENC_SET_VBI_LINE
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 183/0xB7
+
+Description
+^^^^^^^^^^^
+
+Selects VBI line number.
+
+Param[0]
+^^^^^^^^
+
+- Bits 0:4 line number
+- Bit 31 0=top_field, 1=bottom_field
+- Bits 0:31 all set specifies "all lines"
+
+Param[1]
+^^^^^^^^
+
+VBI line information features: 0=disabled, 1=enabled
+
+Param[2]
+^^^^^^^^
+
+Slicing: 0=None, 1=Closed Caption
+Almost certainly not implemented. Set to 0.
+
+Param[3]
+^^^^^^^^
+
+Luminance samples in this line.
+Almost certainly not implemented. Set to 0.
+
+Param[4]
+^^^^^^^^
+
+Chrominance samples in this line
+Almost certainly not implemented. Set to 0.
+
+
+
+CX2341X_ENC_SET_STREAM_TYPE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 185/0xB9
+
+Description
+^^^^^^^^^^^
+
+Assign stream type
+
+.. note::
+
+ Transport stream is not working in recent firmwares.
+ And in older firmwares the timestamps in the TS seem to be
+ unreliable.
+
+Param[0]
+^^^^^^^^
+
+- 0=Program stream
+- 1=Transport stream
+- 2=MPEG1 stream
+- 3=PES A/V stream
+- 5=PES Video stream
+- 7=PES Audio stream
+- 10=DVD stream
+- 11=VCD stream
+- 12=SVCD stream
+- 13=DVD_S1 stream
+- 14=DVD_S2 stream
+
+
+
+CX2341X_ENC_SET_OUTPUT_PORT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 187/0xBB
+
+Description
+^^^^^^^^^^^
+
+Assign stream output port. Normally 0 when the data is copied through
+the PCI bus (DMA), and 1 when the data is streamed to another chip
+(pvrusb and cx88-blackbird).
+
+Param[0]
+^^^^^^^^
+
+- 0=Memory (default)
+- 1=Streaming
+- 2=Serial
+
+Param[1]
+^^^^^^^^
+
+Unknown, but leaving this to 0 seems to work best. Indications are that
+this might have to do with USB support, although passing anything but 0
+only breaks things.
+
+
+
+CX2341X_ENC_SET_AUDIO_PROPERTIES
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 189/0xBD
+
+Description
+^^^^^^^^^^^
+
+Set audio stream properties, may be called while encoding is in progress.
+
+.. note::
+
+ All bitfields are consistent with ISO11172 documentation except
+ bits 2:3 which ISO docs define as:
+
+ - '11' Layer I
+ - '10' Layer II
+ - '01' Layer III
+ - '00' Undefined
+
+ This discrepancy may indicate a possible error in the documentation.
+ Testing indicated that only Layer II is actually working, and that
+ the minimum bitrate should be 192 kbps.
+
+Param[0]
+^^^^^^^^
+
+Bitmask:
+
+.. code-block:: none
+
+ 0:1 '00' 44.1Khz
+ '01' 48Khz
+ '10' 32Khz
+ '11' reserved
+
+ 2:3 '01'=Layer I
+ '10'=Layer II
+
+ 4:7 Bitrate:
+ Index | Layer I | Layer II
+ ------+-------------+------------
+ '0000' | free format | free format
+ '0001' | 32 kbit/s | 32 kbit/s
+ '0010' | 64 kbit/s | 48 kbit/s
+ '0011' | 96 kbit/s | 56 kbit/s
+ '0100' | 128 kbit/s | 64 kbit/s
+ '0101' | 160 kbit/s | 80 kbit/s
+ '0110' | 192 kbit/s | 96 kbit/s
+ '0111' | 224 kbit/s | 112 kbit/s
+ '1000' | 256 kbit/s | 128 kbit/s
+ '1001' | 288 kbit/s | 160 kbit/s
+ '1010' | 320 kbit/s | 192 kbit/s
+ '1011' | 352 kbit/s | 224 kbit/s
+ '1100' | 384 kbit/s | 256 kbit/s
+ '1101' | 416 kbit/s | 320 kbit/s
+ '1110' | 448 kbit/s | 384 kbit/s
+
+ .. note::
+
+ For Layer II, not all combinations of total bitrate
+ and mode are allowed. See ISO11172-3 3-Annex B,
+ Table 3-B.2
+
+ 8:9 '00'=Stereo
+ '01'=JointStereo
+ '10'=Dual
+ '11'=Mono
+
+ .. note::
+
+ The cx23415 cannot decode Joint Stereo properly.
+
+ 10:11 Mode Extension used in joint_stereo mode.
+ In Layer I and II they indicate which subbands are in
+ intensity_stereo. All other subbands are coded in stereo.
+ '00' subbands 4-31 in intensity_stereo, bound==4
+ '01' subbands 8-31 in intensity_stereo, bound==8
+ '10' subbands 12-31 in intensity_stereo, bound==12
+ '11' subbands 16-31 in intensity_stereo, bound==16
+
+ 12:13 Emphasis:
+ '00' None
+ '01' 50/15uS
+ '10' reserved
+ '11' CCITT J.17
+
+ 14 CRC:
+ '0' off
+ '1' on
+
+ 15 Copyright:
+ '0' off
+ '1' on
+
+ 16 Generation:
+ '0' copy
+ '1' original
+
+
+
+CX2341X_ENC_HALT_FW
+~~~~~~~~~~~~~~~~~~~
+
+Enum: 195/0xC3
+
+Description
+^^^^^^^^^^^
+
+The firmware is halted and no further API calls are serviced until the
+firmware is uploaded again.
+
+
+
+CX2341X_ENC_GET_VERSION
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 196/0xC4
+
+Description
+^^^^^^^^^^^
+
+Returns the version of the encoder firmware.
+
+Result[0]
+^^^^^^^^^
+
+Version bitmask:
+- Bits 0:15 build
+- Bits 16:23 minor
+- Bits 24:31 major
+
+
+
+CX2341X_ENC_SET_GOP_CLOSURE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 197/0xC5
+
+Description
+^^^^^^^^^^^
+
+Assigns the GOP open/close property.
+
+Param[0]
+^^^^^^^^
+
+- 0=Open
+- 1=Closed
+
+
+
+CX2341X_ENC_GET_SEQ_END
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 198/0xC6
+
+Description
+^^^^^^^^^^^
+
+Obtains the sequence end code of the encoder's buffer. When a capture
+is started a number of interrupts are still generated, the last of
+which will have Result[0] set to 1 and Result[1] will contain the size
+of the buffer.
+
+Result[0]
+^^^^^^^^^
+
+State of the transfer (1 if last buffer)
+
+Result[1]
+^^^^^^^^^
+
+If Result[0] is 1, this contains the size of the last buffer, undefined
+otherwise.
+
+
+
+CX2341X_ENC_SET_PGM_INDEX_INFO
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 199/0xC7
+
+Description
+^^^^^^^^^^^
+
+Sets the Program Index Information.
+The information is stored as follows:
+
+.. code-block:: c
+
+ struct info {
+ u32 length; // Length of this frame
+ u32 offset_low; // Offset in the file of the
+ u32 offset_high; // start of this frame
+ u32 mask1; // Bits 0-2 are the type mask:
+ // 1=I, 2=P, 4=B
+ // 0=End of Program Index, other fields
+ // are invalid.
+ u32 pts; // The PTS of the frame
+ u32 mask2; // Bit 0 is bit 32 of the pts.
+ };
+ u32 table_ptr;
+ struct info index[400];
+
+The table_ptr is the encoder memory address in the table were
+*new* entries will be written.
+
+.. note:: This is a ringbuffer, so the table_ptr will wraparound.
+
+Param[0]
+^^^^^^^^
+
+Picture Mask:
+- 0=No index capture
+- 1=I frames
+- 3=I,P frames
+- 7=I,P,B frames
+
+(Seems to be ignored, it always indexes I, P and B frames)
+
+Param[1]
+^^^^^^^^
+
+Elements requested (up to 400)
+
+Result[0]
+^^^^^^^^^
+
+Offset in the encoder memory of the start of the table.
+
+Result[1]
+^^^^^^^^^
+
+Number of allocated elements up to a maximum of Param[1]
+
+
+
+CX2341X_ENC_SET_VBI_CONFIG
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 200/0xC8
+
+Description
+^^^^^^^^^^^
+
+Configure VBI settings
+
+Param[0]
+^^^^^^^^
+
+Bitmap:
+
+.. code-block:: none
+
+ 0 Mode '0' Sliced, '1' Raw
+ 1:3 Insertion:
+ '000' insert in extension & user data
+ '001' insert in private packets
+ '010' separate stream and user data
+ '111' separate stream and private data
+ 8:15 Stream ID (normally 0xBD)
+
+Param[1]
+^^^^^^^^
+
+Frames per interrupt (max 8). Only valid in raw mode.
+
+Param[2]
+^^^^^^^^
+
+Total raw VBI frames. Only valid in raw mode.
+
+Param[3]
+^^^^^^^^
+
+Start codes
+
+Param[4]
+^^^^^^^^
+
+Stop codes
+
+Param[5]
+^^^^^^^^
+
+Lines per frame
+
+Param[6]
+^^^^^^^^
+
+Byte per line
+
+Result[0]
+^^^^^^^^^
+
+Observed frames per interrupt in raw mode only. Rage 1 to Param[1]
+
+Result[1]
+^^^^^^^^^
+
+Observed number of frames in raw mode. Range 1 to Param[2]
+
+Result[2]
+^^^^^^^^^
+
+Memory offset to start or raw VBI data
+
+
+
+CX2341X_ENC_SET_DMA_BLOCK_SIZE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 201/0xC9
+
+Description
+^^^^^^^^^^^
+
+Set DMA transfer block size
+
+Param[0]
+^^^^^^^^
+
+DMA transfer block size in bytes or frames. When unit is bytes,
+supported block sizes are 2^7, 2^8 and 2^9 bytes.
+
+Param[1]
+^^^^^^^^
+
+Unit: 0=bytes, 1=frames
+
+
+
+CX2341X_ENC_GET_PREV_DMA_INFO_MB_10
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 202/0xCA
+
+Description
+^^^^^^^^^^^
+
+Returns information on the previous DMA transfer in conjunction with
+bit 27 of the interrupt mask. Uses mailbox 10.
+
+Result[0]
+^^^^^^^^^
+
+Type of stream
+
+Result[1]
+^^^^^^^^^
+
+Address Offset
+
+Result[2]
+^^^^^^^^^
+
+Maximum size of transfer
+
+
+
+CX2341X_ENC_GET_PREV_DMA_INFO_MB_9
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 203/0xCB
+
+Description
+^^^^^^^^^^^
+
+Returns information on the previous DMA transfer in conjunction with
+bit 27 or 18 of the interrupt mask. Uses mailbox 9.
+
+Result[0]
+^^^^^^^^^
+
+Status bits:
+- 0 read completed
+- 1 write completed
+- 2 DMA read error
+- 3 DMA write error
+- 4 Scatter-Gather array error
+
+Result[1]
+^^^^^^^^^
+
+DMA type
+
+Result[2]
+^^^^^^^^^
+
+Presentation Time Stamp bits 0..31
+
+Result[3]
+^^^^^^^^^
+
+Presentation Time Stamp bit 32
+
+
+
+CX2341X_ENC_SCHED_DMA_TO_HOST
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 204/0xCC
+
+Description
+^^^^^^^^^^^
+
+Setup DMA to host operation
+
+Param[0]
+^^^^^^^^
+
+Memory address of link list
+
+Param[1]
+^^^^^^^^
+
+Length of link list (wtf: what units ???)
+
+Param[2]
+^^^^^^^^
+
+DMA type (0=MPEG)
+
+
+
+CX2341X_ENC_INITIALIZE_INPUT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 205/0xCD
+
+Description
+^^^^^^^^^^^
+
+Initializes the video input
+
+
+
+CX2341X_ENC_SET_FRAME_DROP_RATE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 208/0xD0
+
+Description
+^^^^^^^^^^^
+
+For each frame captured, skip specified number of frames.
+
+Param[0]
+^^^^^^^^
+
+Number of frames to skip
+
+
+
+CX2341X_ENC_PAUSE_ENCODER
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 210/0xD2
+
+Description
+^^^^^^^^^^^
+
+During a pause condition, all frames are dropped instead of being encoded.
+
+Param[0]
+^^^^^^^^
+
+- 0=Pause encoding
+- 1=Continue encoding
+
+
+
+CX2341X_ENC_REFRESH_INPUT
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 211/0xD3
+
+Description
+^^^^^^^^^^^
+
+Refreshes the video input
+
+
+
+CX2341X_ENC_SET_COPYRIGHT
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 212/0xD4
+
+Description
+^^^^^^^^^^^
+
+Sets stream copyright property
+
+Param[0]
+^^^^^^^^
+
+
+- 0=Stream is not copyrighted
+- 1=Stream is copyrighted
+
+
+
+CX2341X_ENC_SET_EVENT_NOTIFICATION
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 213/0xD5
+
+Description
+^^^^^^^^^^^
+
+Setup firmware to notify the host about a particular event. Host must
+unmask the interrupt bit.
+
+Param[0]
+^^^^^^^^
+
+Event (0=refresh encoder input)
+
+Param[1]
+^^^^^^^^
+
+Notification 0=disabled 1=enabled
+
+Param[2]
+^^^^^^^^
+
+Interrupt bit
+
+Param[3]
+^^^^^^^^
+
+Mailbox slot, -1 if no mailbox required.
+
+
+
+CX2341X_ENC_SET_NUM_VSYNC_LINES
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 214/0xD6
+
+Description
+^^^^^^^^^^^
+
+Depending on the analog video decoder used, this assigns the number
+of lines for field 1 and 2.
+
+Param[0]
+^^^^^^^^
+
+Field 1 number of lines:
+- 0x00EF for SAA7114
+- 0x00F0 for SAA7115
+- 0x0105 for Micronas
+
+Param[1]
+^^^^^^^^
+
+Field 2 number of lines:
+- 0x00EF for SAA7114
+- 0x00F0 for SAA7115
+- 0x0106 for Micronas
+
+
+
+CX2341X_ENC_SET_PLACEHOLDER
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 215/0xD7
+
+Description
+^^^^^^^^^^^
+
+Provides a mechanism of inserting custom user data in the MPEG stream.
+
+Param[0]
+^^^^^^^^
+
+- 0=extension & user data
+- 1=private packet with stream ID 0xBD
+
+Param[1]
+^^^^^^^^
+
+Rate at which to insert data, in units of frames (for private packet)
+or GOPs (for ext. & user data)
+
+Param[2]
+^^^^^^^^
+
+Number of data DWORDs (below) to insert
+
+Param[3]
+^^^^^^^^
+
+Custom data 0
+
+Param[4]
+^^^^^^^^
+
+Custom data 1
+
+Param[5]
+^^^^^^^^
+
+Custom data 2
+
+Param[6]
+^^^^^^^^
+
+Custom data 3
+
+Param[7]
+^^^^^^^^
+
+Custom data 4
+
+Param[8]
+^^^^^^^^
+
+Custom data 5
+
+Param[9]
+^^^^^^^^
+
+Custom data 6
+
+Param[10]
+^^^^^^^^^
+
+Custom data 7
+
+Param[11]
+^^^^^^^^^
+
+Custom data 8
+
+
+
+CX2341X_ENC_MUTE_VIDEO
+~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 217/0xD9
+
+Description
+^^^^^^^^^^^
+
+Video muting
+
+Param[0]
+^^^^^^^^
+
+Bit usage:
+
+.. code-block:: none
+
+ 0 '0'=video not muted
+ '1'=video muted, creates frames with the YUV color defined below
+ 1:7 Unused
+ 8:15 V chrominance information
+ 16:23 U chrominance information
+ 24:31 Y luminance information
+
+
+
+CX2341X_ENC_MUTE_AUDIO
+~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 218/0xDA
+
+Description
+^^^^^^^^^^^
+
+Audio muting
+
+Param[0]
+^^^^^^^^
+
+- 0=audio not muted
+- 1=audio muted (produces silent mpeg audio stream)
+
+
+
+CX2341X_ENC_SET_VERT_CROP_LINE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 219/0xDB
+
+Description
+^^^^^^^^^^^
+
+Something to do with 'Vertical Crop Line'
+
+Param[0]
+^^^^^^^^
+
+If saa7114 and raw VBI capture and 60 Hz, then set to 10001.
+Else 0.
+
+
+
+CX2341X_ENC_MISC
+~~~~~~~~~~~~~~~~
+
+Enum: 220/0xDC
+
+Description
+^^^^^^^^^^^
+
+Miscellaneous actions. Not known for 100% what it does. It's really a
+sort of ioctl call. The first parameter is a command number, the second
+the value.
+
+Param[0]
+^^^^^^^^
+
+Command number:
+
+.. code-block:: none
+
+ 1=set initial SCR value when starting encoding (works).
+ 2=set quality mode (apparently some test setting).
+ 3=setup advanced VIM protection handling.
+ Always 1 for the cx23416 and 0 for cx23415.
+ 4=generate DVD compatible PTS timestamps
+ 5=USB flush mode
+ 6=something to do with the quantization matrix
+ 7=set navigation pack insertion for DVD: adds 0xbf (private stream 2)
+ packets to the MPEG. The size of these packets is 2048 bytes (including
+ the header of 6 bytes: 0x000001bf + length). The payload is zeroed and
+ it is up to the application to fill them in. These packets are apparently
+ inserted every four frames.
+ 8=enable scene change detection (seems to be a failure)
+ 9=set history parameters of the video input module
+ 10=set input field order of VIM
+ 11=set quantization matrix
+ 12=reset audio interface after channel change or input switch (has no argument).
+ Needed for the cx2584x, not needed for the mspx4xx, but it doesn't seem to
+ do any harm calling it regardless.
+ 13=set audio volume delay
+ 14=set audio delay
+
+
+Param[1]
+^^^^^^^^
+
+Command value.
+
+Decoder firmware API description
+--------------------------------
+
+.. note:: this API is part of the decoder firmware, so it's cx23415 only.
+
+
+
+CX2341X_DEC_PING_FW
+~~~~~~~~~~~~~~~~~~~
+
+Enum: 0/0x00
+
+Description
+^^^^^^^^^^^
+
+This API call does nothing. It may be used to check if the firmware
+is responding.
+
+
+
+CX2341X_DEC_START_PLAYBACK
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 1/0x01
+
+Description
+^^^^^^^^^^^
+
+Begin or resume playback.
+
+Param[0]
+^^^^^^^^
+
+0 based frame number in GOP to begin playback from.
+
+Param[1]
+^^^^^^^^
+
+Specifies the number of muted audio frames to play before normal
+audio resumes. (This is not implemented in the firmware, leave at 0)
+
+
+
+CX2341X_DEC_STOP_PLAYBACK
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 2/0x02
+
+Description
+^^^^^^^^^^^
+
+Ends playback and clears all decoder buffers. If PTS is not zero,
+playback stops at specified PTS.
+
+Param[0]
+^^^^^^^^
+
+Display 0=last frame, 1=black
+
+.. note::
+
+ this takes effect immediately, so if you want to wait for a PTS,
+ then use '0', otherwise the screen goes to black at once.
+ You can call this later (even if there is no playback) with a 1 value
+ to set the screen to black.
+
+Param[1]
+^^^^^^^^
+
+PTS low
+
+Param[2]
+^^^^^^^^
+
+PTS high
+
+
+
+CX2341X_DEC_SET_PLAYBACK_SPEED
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 3/0x03
+
+Description
+^^^^^^^^^^^
+
+Playback stream at speed other than normal. There are two modes of
+operation:
+
+ - Smooth: host transfers entire stream and firmware drops unused
+ frames.
+ - Coarse: host drops frames based on indexing as required to achieve
+ desired speed.
+
+Param[0]
+^^^^^^^^
+
+.. code-block:: none
+
+ Bitmap:
+ 0:7 0 normal
+ 1 fast only "1.5 times"
+ n nX fast, 1/nX slow
+ 30 Framedrop:
+ '0' during 1.5 times play, every other B frame is dropped
+ '1' during 1.5 times play, stream is unchanged (bitrate
+ must not exceed 8mbps)
+ 31 Speed:
+ '0' slow
+ '1' fast
+
+.. note::
+
+ n is limited to 2. Anything higher does not result in
+ faster playback. Instead the host should start dropping frames.
+
+Param[1]
+^^^^^^^^
+
+Direction: 0=forward, 1=reverse
+
+.. note::
+
+ to make reverse playback work you have to write full GOPs in
+ reverse order.
+
+Param[2]
+^^^^^^^^
+
+.. code-block:: none
+
+ Picture mask:
+ 1=I frames
+ 3=I, P frames
+ 7=I, P, B frames
+
+Param[3]
+^^^^^^^^
+
+B frames per GOP (for reverse play only)
+
+.. note::
+
+ for reverse playback the Picture Mask should be set to I or I, P.
+ Adding B frames to the mask will result in corrupt video. This field
+ has to be set to the correct value in order to keep the timing correct.
+
+Param[4]
+^^^^^^^^
+
+Mute audio: 0=disable, 1=enable
+
+Param[5]
+^^^^^^^^
+
+Display 0=frame, 1=field
+
+Param[6]
+^^^^^^^^
+
+Specifies the number of muted audio frames to play before normal audio
+resumes. (Not implemented in the firmware, leave at 0)
+
+
+
+CX2341X_DEC_STEP_VIDEO
+~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 5/0x05
+
+Description
+^^^^^^^^^^^
+
+Each call to this API steps the playback to the next unit defined below
+in the current playback direction.
+
+Param[0]
+^^^^^^^^
+
+0=frame, 1=top field, 2=bottom field
+
+
+
+CX2341X_DEC_SET_DMA_BLOCK_SIZE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 8/0x08
+
+Description
+^^^^^^^^^^^
+
+Set DMA transfer block size. Counterpart to API 0xC9
+
+Param[0]
+^^^^^^^^
+
+DMA transfer block size in bytes. A different size may be specified
+when issuing the DMA transfer command.
+
+
+
+CX2341X_DEC_GET_XFER_INFO
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 9/0x09
+
+Description
+^^^^^^^^^^^
+
+This API call may be used to detect an end of stream condition.
+
+Result[0]
+^^^^^^^^^
+
+Stream type
+
+Result[1]
+^^^^^^^^^
+
+Address offset
+
+Result[2]
+^^^^^^^^^
+
+Maximum bytes to transfer
+
+Result[3]
+^^^^^^^^^
+
+Buffer fullness
+
+
+
+CX2341X_DEC_GET_DMA_STATUS
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 10/0x0A
+
+Description
+^^^^^^^^^^^
+
+Status of the last DMA transfer
+
+Result[0]
+^^^^^^^^^
+
+Bit 1 set means transfer complete
+Bit 2 set means DMA error
+Bit 3 set means linked list error
+
+Result[1]
+^^^^^^^^^
+
+DMA type: 0=MPEG, 1=OSD, 2=YUV
+
+
+
+CX2341X_DEC_SCHED_DMA_FROM_HOST
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 11/0x0B
+
+Description
+^^^^^^^^^^^
+
+Setup DMA from host operation. Counterpart to API 0xCC
+
+Param[0]
+^^^^^^^^
+
+Memory address of link list
+
+Param[1]
+^^^^^^^^
+
+Total # of bytes to transfer
+
+Param[2]
+^^^^^^^^
+
+DMA type (0=MPEG, 1=OSD, 2=YUV)
+
+
+
+CX2341X_DEC_PAUSE_PLAYBACK
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 13/0x0D
+
+Description
+^^^^^^^^^^^
+
+Freeze playback immediately. In this mode, when internal buffers are
+full, no more data will be accepted and data request IRQs will be
+masked.
+
+Param[0]
+^^^^^^^^
+
+Display: 0=last frame, 1=black
+
+
+
+CX2341X_DEC_HALT_FW
+~~~~~~~~~~~~~~~~~~~
+
+Enum: 14/0x0E
+
+Description
+^^^^^^^^^^^
+
+The firmware is halted and no further API calls are serviced until
+the firmware is uploaded again.
+
+
+
+CX2341X_DEC_SET_STANDARD
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 16/0x10
+
+Description
+^^^^^^^^^^^
+
+Selects display standard
+
+Param[0]
+^^^^^^^^
+
+0=NTSC, 1=PAL
+
+
+
+CX2341X_DEC_GET_VERSION
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 17/0x11
+
+Description
+^^^^^^^^^^^
+
+Returns decoder firmware version information
+
+Result[0]
+^^^^^^^^^
+
+Version bitmask:
+ - Bits 0:15 build
+ - Bits 16:23 minor
+ - Bits 24:31 major
+
+
+
+CX2341X_DEC_SET_STREAM_INPUT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 20/0x14
+
+Description
+^^^^^^^^^^^
+
+Select decoder stream input port
+
+Param[0]
+^^^^^^^^
+
+0=memory (default), 1=streaming
+
+
+
+CX2341X_DEC_GET_TIMING_INFO
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 21/0x15
+
+Description
+^^^^^^^^^^^
+
+Returns timing information from start of playback
+
+Result[0]
+^^^^^^^^^
+
+Frame count by decode order
+
+Result[1]
+^^^^^^^^^
+
+Video PTS bits 0:31 by display order
+
+Result[2]
+^^^^^^^^^
+
+Video PTS bit 32 by display order
+
+Result[3]
+^^^^^^^^^
+
+SCR bits 0:31 by display order
+
+Result[4]
+^^^^^^^^^
+
+SCR bit 32 by display order
+
+
+
+CX2341X_DEC_SET_AUDIO_MODE
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 22/0x16
+
+Description
+^^^^^^^^^^^
+
+Select audio mode
+
+Param[0]
+^^^^^^^^
+
+Dual mono mode action
+ 0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged
+
+Param[1]
+^^^^^^^^
+
+Stereo mode action:
+ 0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged
+
+
+
+CX2341X_DEC_SET_EVENT_NOTIFICATION
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 23/0x17
+
+Description
+^^^^^^^^^^^
+
+Setup firmware to notify the host about a particular event.
+Counterpart to API 0xD5
+
+Param[0]
+^^^^^^^^
+
+Event:
+ - 0=Audio mode change between mono, (joint) stereo and dual channel.
+ - 3=Decoder started
+ - 4=Unknown: goes off 10-15 times per second while decoding.
+ - 5=Some sync event: goes off once per frame.
+
+Param[1]
+^^^^^^^^
+
+Notification 0=disabled, 1=enabled
+
+Param[2]
+^^^^^^^^
+
+Interrupt bit
+
+Param[3]
+^^^^^^^^
+
+Mailbox slot, -1 if no mailbox required.
+
+
+
+CX2341X_DEC_SET_DISPLAY_BUFFERS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 24/0x18
+
+Description
+^^^^^^^^^^^
+
+Number of display buffers. To decode all frames in reverse playback you
+must use nine buffers.
+
+Param[0]
+^^^^^^^^
+
+0=six buffers, 1=nine buffers
+
+
+
+CX2341X_DEC_EXTRACT_VBI
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 25/0x19
+
+Description
+^^^^^^^^^^^
+
+Extracts VBI data
+
+Param[0]
+^^^^^^^^
+
+0=extract from extension & user data, 1=extract from private packets
+
+Result[0]
+^^^^^^^^^
+
+VBI table location
+
+Result[1]
+^^^^^^^^^
+
+VBI table size
+
+
+
+CX2341X_DEC_SET_DECODER_SOURCE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 26/0x1A
+
+Description
+^^^^^^^^^^^
+
+Selects decoder source. Ensure that the parameters passed to this
+API match the encoder settings.
+
+Param[0]
+^^^^^^^^
+
+Mode: 0=MPEG from host, 1=YUV from encoder, 2=YUV from host
+
+Param[1]
+^^^^^^^^
+
+YUV picture width
+
+Param[2]
+^^^^^^^^
+
+YUV picture height
+
+Param[3]
+^^^^^^^^
+
+Bitmap: see Param[0] of API 0xBD
+
+
+
+CX2341X_DEC_SET_PREBUFFERING
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 30/0x1E
+
+Description
+^^^^^^^^^^^
+
+Decoder prebuffering, when enabled up to 128KB are buffered for
+streams <8mpbs or 640KB for streams >8mbps
+
+Param[0]
+^^^^^^^^
+
+0=off, 1=on
+
+PVR350 Video decoder registers 0x02002800 -> 0x02002B00
+-------------------------------------------------------
+
+Author: Ian Armstrong <ian@iarmst.demon.co.uk>
+
+Version: v0.4
+
+Date: 12 March 2007
+
+
+This list has been worked out through trial and error. There will be mistakes
+and omissions. Some registers have no obvious effect so it's hard to say what
+they do, while others interact with each other, or require a certain load
+sequence. Horizontal filter setup is one example, with six registers working
+in unison and requiring a certain load sequence to correctly configure. The
+indexed colour palette is much easier to set at just two registers, but again
+it requires a certain load sequence.
+
+Some registers are fussy about what they are set to. Load in a bad value & the
+decoder will fail. A firmware reload will often recover, but sometimes a reset
+is required. For registers containing size information, setting them to 0 is
+generally a bad idea. For other control registers i.e. 2878, you'll only find
+out what values are bad when it hangs.
+
+.. code-block:: none
+
+ --------------------------------------------------------------------------------
+ 2800
+ bit 0
+ Decoder enable
+ 0 = disable
+ 1 = enable
+ --------------------------------------------------------------------------------
+ 2804
+ bits 0:31
+ Decoder horizontal Y alias register 1
+ ---------------
+ 2808
+ bits 0:31
+ Decoder horizontal Y alias register 2
+ ---------------
+ 280C
+ bits 0:31
+ Decoder horizontal Y alias register 3
+ ---------------
+ 2810
+ bits 0:31
+ Decoder horizontal Y alias register 4
+ ---------------
+ 2814
+ bits 0:31
+ Decoder horizontal Y alias register 5
+ ---------------
+ 2818
+ bits 0:31
+ Decoder horizontal Y alias trigger
+
+ These six registers control the horizontal aliasing filter for the Y plane.
+ The first five registers must all be loaded before accessing the trigger
+ (2818), as this register actually clocks the data through for the first
+ five.
+
+ To correctly program set the filter, this whole procedure must be done 16
+ times. The actual register contents are copied from a lookup-table in the
+ firmware which contains 4 different filter settings.
+
+ --------------------------------------------------------------------------------
+ 281C
+ bits 0:31
+ Decoder horizontal UV alias register 1
+ ---------------
+ 2820
+ bits 0:31
+ Decoder horizontal UV alias register 2
+ ---------------
+ 2824
+ bits 0:31
+ Decoder horizontal UV alias register 3
+ ---------------
+ 2828
+ bits 0:31
+ Decoder horizontal UV alias register 4
+ ---------------
+ 282C
+ bits 0:31
+ Decoder horizontal UV alias register 5
+ ---------------
+ 2830
+ bits 0:31
+ Decoder horizontal UV alias trigger
+
+ These six registers control the horizontal aliasing for the UV plane.
+ Operation is the same as the Y filter, with 2830 being the trigger
+ register.
+
+ --------------------------------------------------------------------------------
+ 2834
+ bits 0:15
+ Decoder Y source width in pixels
+
+ bits 16:31
+ Decoder Y destination width in pixels
+ ---------------
+ 2838
+ bits 0:15
+ Decoder UV source width in pixels
+
+ bits 16:31
+ Decoder UV destination width in pixels
+
+ NOTE: For both registers, the resulting image must be fully visible on
+ screen. If the image exceeds the right edge both the source and destination
+ size must be adjusted to reflect the visible portion. For the source width,
+ you must take into account the scaling when calculating the new value.
+ --------------------------------------------------------------------------------
+
+ 283C
+ bits 0:31
+ Decoder Y horizontal scaling
+ Normally = Reg 2854 >> 2
+ ---------------
+ 2840
+ bits 0:31
+ Decoder ?? unknown - horizontal scaling
+ Usually 0x00080514
+ ---------------
+ 2844
+ bits 0:31
+ Decoder UV horizontal scaling
+ Normally = Reg 2854 >> 2
+ ---------------
+ 2848
+ bits 0:31
+ Decoder ?? unknown - horizontal scaling
+ Usually 0x00100514
+ ---------------
+ 284C
+ bits 0:31
+ Decoder ?? unknown - Y plane
+ Usually 0x00200020
+ ---------------
+ 2850
+ bits 0:31
+ Decoder ?? unknown - UV plane
+ Usually 0x00200020
+ ---------------
+ 2854
+ bits 0:31
+ Decoder 'master' value for horizontal scaling
+ ---------------
+ 2858
+ bits 0:31
+ Decoder ?? unknown
+ Usually 0
+ ---------------
+ 285C
+ bits 0:31
+ Decoder ?? unknown
+ Normally = Reg 2854 >> 1
+ ---------------
+ 2860
+ bits 0:31
+ Decoder ?? unknown
+ Usually 0
+ ---------------
+ 2864
+ bits 0:31
+ Decoder ?? unknown
+ Normally = Reg 2854 >> 1
+ ---------------
+ 2868
+ bits 0:31
+ Decoder ?? unknown
+ Usually 0
+
+ Most of these registers either control horizontal scaling, or appear linked
+ to it in some way. Register 2854 contains the 'master' value & the other
+ registers can be calculated from that one. You must also remember to
+ correctly set the divider in Reg 2874.
+
+ To enlarge:
+ Reg 2854 = (source_width * 0x00200000) / destination_width
+ Reg 2874 = No divide
+
+ To reduce from full size down to half size:
+ Reg 2854 = (source_width/2 * 0x00200000) / destination width
+ Reg 2874 = Divide by 2
+
+ To reduce from half size down to quarter size:
+ Reg 2854 = (source_width/4 * 0x00200000) / destination width
+ Reg 2874 = Divide by 4
+
+ The result is always rounded up.
+
+ --------------------------------------------------------------------------------
+ 286C
+ bits 0:15
+ Decoder horizontal Y buffer offset
+
+ bits 15:31
+ Decoder horizontal UV buffer offset
+
+ Offset into the video image buffer. If the offset is gradually incremented,
+ the on screen image will move left & wrap around higher up on the right.
+
+ --------------------------------------------------------------------------------
+ 2870
+ bits 0:15
+ Decoder horizontal Y output offset
+
+ bits 16:31
+ Decoder horizontal UV output offset
+
+ Offsets the actual video output. Controls output alignment of the Y & UV
+ planes. The higher the value, the greater the shift to the left. Use
+ reg 2890 to move the image right.
+
+ --------------------------------------------------------------------------------
+ 2874
+ bits 0:1
+ Decoder horizontal Y output size divider
+ 00 = No divide
+ 01 = Divide by 2
+ 10 = Divide by 3
+
+ bits 4:5
+ Decoder horizontal UV output size divider
+ 00 = No divide
+ 01 = Divide by 2
+ 10 = Divide by 3
+
+ bit 8
+ Decoder ?? unknown
+ 0 = Normal
+ 1 = Affects video output levels
+
+ bit 16
+ Decoder ?? unknown
+ 0 = Normal
+ 1 = Disable horizontal filter
+
+ --------------------------------------------------------------------------------
+ 2878
+ bit 0
+ ?? unknown
+
+ bit 1
+ osd on/off
+ 0 = osd off
+ 1 = osd on
+
+ bit 2
+ Decoder + osd video timing
+ 0 = NTSC
+ 1 = PAL
+
+ bits 3:4
+ ?? unknown
+
+ bit 5
+ Decoder + osd
+ Swaps upper & lower fields
+
+ --------------------------------------------------------------------------------
+ 287C
+ bits 0:10
+ Decoder & osd ?? unknown
+ Moves entire screen horizontally. Starts at 0x005 with the screen
+ shifted heavily to the right. Incrementing in steps of 0x004 will
+ gradually shift the screen to the left.
+
+ bits 11:31
+ ?? unknown
+
+ Normally contents are 0x00101111 (NTSC) or 0x1010111d (PAL)
+
+ --------------------------------------------------------------------------------
+ 2880 -------- ?? unknown
+ 2884 -------- ?? unknown
+ --------------------------------------------------------------------------------
+ 2888
+ bit 0
+ Decoder + osd ?? unknown
+ 0 = Normal
+ 1 = Misaligned fields (Correctable through 289C & 28A4)
+
+ bit 4
+ ?? unknown
+
+ bit 8
+ ?? unknown
+
+ Warning: Bad values will require a firmware reload to recover.
+ Known to be bad are 0x000,0x011,0x100,0x111
+ --------------------------------------------------------------------------------
+ 288C
+ bits 0:15
+ osd ?? unknown
+ Appears to affect the osd position stability. The higher the value the
+ more unstable it becomes. Decoder output remains stable.
+
+ bits 16:31
+ osd ?? unknown
+ Same as bits 0:15
+
+ --------------------------------------------------------------------------------
+ 2890
+ bits 0:11
+ Decoder output horizontal offset.
+
+ Horizontal offset moves the video image right. A small left shift is
+ possible, but it's better to use reg 2870 for that due to its greater
+ range.
+
+ NOTE: Video corruption will occur if video window is shifted off the right
+ edge. To avoid this read the notes for 2834 & 2838.
+ --------------------------------------------------------------------------------
+ 2894
+ bits 0:23
+ Decoder output video surround colour.
+
+ Contains the colour (in yuv) used to fill the screen when the video is
+ running in a window.
+ --------------------------------------------------------------------------------
+ 2898
+ bits 0:23
+ Decoder video window colour
+ Contains the colour (in yuv) used to fill the video window when the
+ video is turned off.
+
+ bit 24
+ Decoder video output
+ 0 = Video on
+ 1 = Video off
+
+ bit 28
+ Decoder plane order
+ 0 = Y,UV
+ 1 = UV,Y
+
+ bit 29
+ Decoder second plane byte order
+ 0 = Normal (UV)
+ 1 = Swapped (VU)
+
+ In normal usage, the first plane is Y & the second plane is UV. Though the
+ order of the planes can be swapped, only the byte order of the second plane
+ can be swapped. This isn't much use for the Y plane, but can be useful for
+ the UV plane.
+
+ --------------------------------------------------------------------------------
+ 289C
+ bits 0:15
+ Decoder vertical field offset 1
+
+ bits 16:31
+ Decoder vertical field offset 2
+
+ Controls field output vertical alignment. The higher the number, the lower
+ the image on screen. Known starting values are 0x011E0017 (NTSC) &
+ 0x01500017 (PAL)
+ --------------------------------------------------------------------------------
+ 28A0
+ bits 0:15
+ Decoder & osd width in pixels
+
+ bits 16:31
+ Decoder & osd height in pixels
+
+ All output from the decoder & osd are disabled beyond this area. Decoder
+ output will simply go black outside of this region. If the osd tries to
+ exceed this area it will become corrupt.
+ --------------------------------------------------------------------------------
+ 28A4
+ bits 0:11
+ osd left shift.
+
+ Has a range of 0x770->0x7FF. With the exception of 0, any value outside of
+ this range corrupts the osd.
+ --------------------------------------------------------------------------------
+ 28A8
+ bits 0:15
+ osd vertical field offset 1
+
+ bits 16:31
+ osd vertical field offset 2
+
+ Controls field output vertical alignment. The higher the number, the lower
+ the image on screen. Known starting values are 0x011E0017 (NTSC) &
+ 0x01500017 (PAL)
+ --------------------------------------------------------------------------------
+ 28AC -------- ?? unknown
+ |
+ V
+ 28BC -------- ?? unknown
+ --------------------------------------------------------------------------------
+ 28C0
+ bit 0
+ Current output field
+ 0 = first field
+ 1 = second field
+
+ bits 16:31
+ Current scanline
+ The scanline counts from the top line of the first field
+ through to the last line of the second field.
+ --------------------------------------------------------------------------------
+ 28C4 -------- ?? unknown
+ |
+ V
+ 28F8 -------- ?? unknown
+ --------------------------------------------------------------------------------
+ 28FC
+ bit 0
+ ?? unknown
+ 0 = Normal
+ 1 = Breaks decoder & osd output
+ --------------------------------------------------------------------------------
+ 2900
+ bits 0:31
+ Decoder vertical Y alias register 1
+ ---------------
+ 2904
+ bits 0:31
+ Decoder vertical Y alias register 2
+ ---------------
+ 2908
+ bits 0:31
+ Decoder vertical Y alias trigger
+
+ These three registers control the vertical aliasing filter for the Y plane.
+ Operation is similar to the horizontal Y filter (2804). The only real
+ difference is that there are only two registers to set before accessing
+ the trigger register (2908). As for the horizontal filter, the values are
+ taken from a lookup table in the firmware, and the procedure must be
+ repeated 16 times to fully program the filter.
+ --------------------------------------------------------------------------------
+ 290C
+ bits 0:31
+ Decoder vertical UV alias register 1
+ ---------------
+ 2910
+ bits 0:31
+ Decoder vertical UV alias register 2
+ ---------------
+ 2914
+ bits 0:31
+ Decoder vertical UV alias trigger
+
+ These three registers control the vertical aliasing filter for the UV
+ plane. Operation is the same as the Y filter, with 2914 being the trigger.
+ --------------------------------------------------------------------------------
+ 2918
+ bits 0:15
+ Decoder Y source height in pixels
+
+ bits 16:31
+ Decoder Y destination height in pixels
+ ---------------
+ 291C
+ bits 0:15
+ Decoder UV source height in pixels divided by 2
+
+ bits 16:31
+ Decoder UV destination height in pixels
+
+ NOTE: For both registers, the resulting image must be fully visible on
+ screen. If the image exceeds the bottom edge both the source and
+ destination size must be adjusted to reflect the visible portion. For the
+ source height, you must take into account the scaling when calculating the
+ new value.
+ --------------------------------------------------------------------------------
+ 2920
+ bits 0:31
+ Decoder Y vertical scaling
+ Normally = Reg 2930 >> 2
+ ---------------
+ 2924
+ bits 0:31
+ Decoder Y vertical scaling
+ Normally = Reg 2920 + 0x514
+ ---------------
+ 2928
+ bits 0:31
+ Decoder UV vertical scaling
+ When enlarging = Reg 2930 >> 2
+ When reducing = Reg 2930 >> 3
+ ---------------
+ 292C
+ bits 0:31
+ Decoder UV vertical scaling
+ Normally = Reg 2928 + 0x514
+ ---------------
+ 2930
+ bits 0:31
+ Decoder 'master' value for vertical scaling
+ ---------------
+ 2934
+ bits 0:31
+ Decoder ?? unknown - Y vertical scaling
+ ---------------
+ 2938
+ bits 0:31
+ Decoder Y vertical scaling
+ Normally = Reg 2930
+ ---------------
+ 293C
+ bits 0:31
+ Decoder ?? unknown - Y vertical scaling
+ ---------------
+ 2940
+ bits 0:31
+ Decoder UV vertical scaling
+ When enlarging = Reg 2930 >> 1
+ When reducing = Reg 2930
+ ---------------
+ 2944
+ bits 0:31
+ Decoder ?? unknown - UV vertical scaling
+ ---------------
+ 2948
+ bits 0:31
+ Decoder UV vertical scaling
+ Normally = Reg 2940
+ ---------------
+ 294C
+ bits 0:31
+ Decoder ?? unknown - UV vertical scaling
+
+ Most of these registers either control vertical scaling, or appear linked
+ to it in some way. Register 2930 contains the 'master' value & all other
+ registers can be calculated from that one. You must also remember to
+ correctly set the divider in Reg 296C
+
+ To enlarge:
+ Reg 2930 = (source_height * 0x00200000) / destination_height
+ Reg 296C = No divide
+
+ To reduce from full size down to half size:
+ Reg 2930 = (source_height/2 * 0x00200000) / destination height
+ Reg 296C = Divide by 2
+
+ To reduce from half down to quarter.
+ Reg 2930 = (source_height/4 * 0x00200000) / destination height
+ Reg 296C = Divide by 4
+
+ --------------------------------------------------------------------------------
+ 2950
+ bits 0:15
+ Decoder Y line index into display buffer, first field
+
+ bits 16:31
+ Decoder Y vertical line skip, first field
+ --------------------------------------------------------------------------------
+ 2954
+ bits 0:15
+ Decoder Y line index into display buffer, second field
+
+ bits 16:31
+ Decoder Y vertical line skip, second field
+ --------------------------------------------------------------------------------
+ 2958
+ bits 0:15
+ Decoder UV line index into display buffer, first field
+
+ bits 16:31
+ Decoder UV vertical line skip, first field
+ --------------------------------------------------------------------------------
+ 295C
+ bits 0:15
+ Decoder UV line index into display buffer, second field
+
+ bits 16:31
+ Decoder UV vertical line skip, second field
+ --------------------------------------------------------------------------------
+ 2960
+ bits 0:15
+ Decoder destination height minus 1
+
+ bits 16:31
+ Decoder destination height divided by 2
+ --------------------------------------------------------------------------------
+ 2964
+ bits 0:15
+ Decoder Y vertical offset, second field
+
+ bits 16:31
+ Decoder Y vertical offset, first field
+
+ These two registers shift the Y plane up. The higher the number, the
+ greater the shift.
+ --------------------------------------------------------------------------------
+ 2968
+ bits 0:15
+ Decoder UV vertical offset, second field
+
+ bits 16:31
+ Decoder UV vertical offset, first field
+
+ These two registers shift the UV plane up. The higher the number, the
+ greater the shift.
+ --------------------------------------------------------------------------------
+ 296C
+ bits 0:1
+ Decoder vertical Y output size divider
+ 00 = No divide
+ 01 = Divide by 2
+ 10 = Divide by 4
+
+ bits 8:9
+ Decoder vertical UV output size divider
+ 00 = No divide
+ 01 = Divide by 2
+ 10 = Divide by 4
+ --------------------------------------------------------------------------------
+ 2970
+ bit 0
+ Decoder ?? unknown
+ 0 = Normal
+ 1 = Affect video output levels
+
+ bit 16
+ Decoder ?? unknown
+ 0 = Normal
+ 1 = Disable vertical filter
+
+ --------------------------------------------------------------------------------
+ 2974 -------- ?? unknown
+ |
+ V
+ 29EF -------- ?? unknown
+ --------------------------------------------------------------------------------
+ 2A00
+ bits 0:2
+ osd colour mode
+ 000 = 8 bit indexed
+ 001 = 16 bit (565)
+ 010 = 15 bit (555)
+ 011 = 12 bit (444)
+ 100 = 32 bit (8888)
+
+ bits 4:5
+ osd display bpp
+ 01 = 8 bit
+ 10 = 16 bit
+ 11 = 32 bit
+
+ bit 8
+ osd global alpha
+ 0 = Off
+ 1 = On
+
+ bit 9
+ osd local alpha
+ 0 = Off
+ 1 = On
+
+ bit 10
+ osd colour key
+ 0 = Off
+ 1 = On
+
+ bit 11
+ osd ?? unknown
+ Must be 1
+
+ bit 13
+ osd colour space
+ 0 = ARGB
+ 1 = AYVU
+
+ bits 16:31
+ osd ?? unknown
+ Must be 0x001B (some kind of buffer pointer ?)
+
+ When the bits-per-pixel is set to 8, the colour mode is ignored and
+ assumed to be 8 bit indexed. For 16 & 32 bits-per-pixel the colour depth
+ is honoured, and when using a colour depth that requires fewer bytes than
+ allocated the extra bytes are used as padding. So for a 32 bpp with 8 bit
+ index colour, there are 3 padding bytes per pixel. It's also possible to
+ select 16bpp with a 32 bit colour mode. This results in the pixel width
+ being doubled, but the color key will not work as expected in this mode.
+
+ Colour key is as it suggests. You designate a colour which will become
+ completely transparent. When using 565, 555 or 444 colour modes, the
+ colour key is always 16 bits wide. The colour to key on is set in Reg 2A18.
+
+ Local alpha works differently depending on the colour mode. For 32bpp & 8
+ bit indexed, local alpha is a per-pixel 256 step transparency, with 0 being
+ transparent and 255 being solid. For the 16bpp modes 555 & 444, the unused
+ bit(s) act as a simple transparency switch, with 0 being solid & 1 being
+ fully transparent. There is no local alpha support for 16bit 565.
+
+ Global alpha is a 256 step transparency that applies to the entire osd,
+ with 0 being transparent & 255 being solid.
+
+ It's possible to combine colour key, local alpha & global alpha.
+ --------------------------------------------------------------------------------
+ 2A04
+ bits 0:15
+ osd x coord for left edge
+
+ bits 16:31
+ osd y coord for top edge
+ ---------------
+ 2A08
+ bits 0:15
+ osd x coord for right edge
+
+ bits 16:31
+ osd y coord for bottom edge
+
+ For both registers, (0,0) = top left corner of the display area. These
+ registers do not control the osd size, only where it's positioned & how
+ much is visible. The visible osd area cannot exceed the right edge of the
+ display, otherwise the osd will become corrupt. See reg 2A10 for
+ setting osd width.
+ --------------------------------------------------------------------------------
+ 2A0C
+ bits 0:31
+ osd buffer index
+
+ An index into the osd buffer. Slowly incrementing this moves the osd left,
+ wrapping around onto the right edge
+ --------------------------------------------------------------------------------
+ 2A10
+ bits 0:11
+ osd buffer 32 bit word width
+
+ Contains the width of the osd measured in 32 bit words. This means that all
+ colour modes are restricted to a byte width which is divisible by 4.
+ --------------------------------------------------------------------------------
+ 2A14
+ bits 0:15
+ osd height in pixels
+
+ bits 16:32
+ osd line index into buffer
+ osd will start displaying from this line.
+ --------------------------------------------------------------------------------
+ 2A18
+ bits 0:31
+ osd colour key
+
+ Contains the colour value which will be transparent.
+ --------------------------------------------------------------------------------
+ 2A1C
+ bits 0:7
+ osd global alpha
+
+ Contains the global alpha value (equiv ivtvfbctl --alpha XX)
+ --------------------------------------------------------------------------------
+ 2A20 -------- ?? unknown
+ |
+ V
+ 2A2C -------- ?? unknown
+ --------------------------------------------------------------------------------
+ 2A30
+ bits 0:7
+ osd colour to change in indexed palette
+ ---------------
+ 2A34
+ bits 0:31
+ osd colour for indexed palette
+
+ To set the new palette, first load the index of the colour to change into
+ 2A30, then load the new colour into 2A34. The full palette is 256 colours,
+ so the index range is 0x00-0xFF
+ --------------------------------------------------------------------------------
+ 2A38 -------- ?? unknown
+ 2A3C -------- ?? unknown
+ --------------------------------------------------------------------------------
+ 2A40
+ bits 0:31
+ osd ?? unknown
+
+ Affects overall brightness, wrapping around to black
+ --------------------------------------------------------------------------------
+ 2A44
+ bits 0:31
+ osd ?? unknown
+
+ Green tint
+ --------------------------------------------------------------------------------
+ 2A48
+ bits 0:31
+ osd ?? unknown
+
+ Red tint
+ --------------------------------------------------------------------------------
+ 2A4C
+ bits 0:31
+ osd ?? unknown
+
+ Affects overall brightness, wrapping around to black
+ --------------------------------------------------------------------------------
+ 2A50
+ bits 0:31
+ osd ?? unknown
+
+ Colour shift
+ --------------------------------------------------------------------------------
+ 2A54
+ bits 0:31
+ osd ?? unknown
+
+ Colour shift
+ --------------------------------------------------------------------------------
+ 2A58 -------- ?? unknown
+ |
+ V
+ 2AFC -------- ?? unknown
+ --------------------------------------------------------------------------------
+ 2B00
+ bit 0
+ osd filter control
+ 0 = filter off
+ 1 = filter on
+
+ bits 1:4
+ osd ?? unknown
+
+ --------------------------------------------------------------------------------
+
+The cx231xx DMA engine
+----------------------
+
+
+This page describes the structures and procedures used by the cx2341x DMA
+engine.
+
+Introduction
+~~~~~~~~~~~~
+
+The cx2341x PCI interface is busmaster capable. This means it has a DMA
+engine to efficiently transfer large volumes of data between the card and main
+memory without requiring help from a CPU. Like most hardware, it must operate
+on contiguous physical memory. This is difficult to come by in large quantities
+on virtual memory machines.
+
+Therefore, it also supports a technique called "scatter-gather". The card can
+transfer multiple buffers in one operation. Instead of allocating one large
+contiguous buffer, the driver can allocate several smaller buffers.
+
+In practice, I've seen the average transfer to be roughly 80K, but transfers
+above 128K were not uncommon, particularly at startup. The 128K figure is
+important, because that is the largest block that the kernel can normally
+allocate. Even still, 128K blocks are hard to come by, so the driver writer is
+urged to choose a smaller block size and learn the scatter-gather technique.
+
+Mailbox #10 is reserved for DMA transfer information.
+
+Note: the hardware expects little-endian data ('intel format').
+
+Flow
+~~~~
+
+This section describes, in general, the order of events when handling DMA
+transfers. Detailed information follows this section.
+
+- The card raises the Encoder interrupt.
+- The driver reads the transfer type, offset and size from Mailbox #10.
+- The driver constructs the scatter-gather array from enough free dma buffers
+ to cover the size.
+- The driver schedules the DMA transfer via the ScheduleDMAtoHost API call.
+- The card raises the DMA Complete interrupt.
+- The driver checks the DMA status register for any errors.
+- The driver post-processes the newly transferred buffers.
+
+NOTE! It is possible that the Encoder and DMA Complete interrupts get raised
+simultaneously. (End of the last, start of the next, etc.)
+
+Mailbox #10
+~~~~~~~~~~~
+
+The Flags, Command, Return Value and Timeout fields are ignored.
+
+- Name: Mailbox #10
+- Results[0]: Type: 0: MPEG.
+- Results[1]: Offset: The position relative to the card's memory space.
+- Results[2]: Size: The exact number of bytes to transfer.
+
+My speculation is that since the StartCapture API has a capture type of "RAW"
+available, that the type field will have other values that correspond to YUV
+and PCM data.
+
+Scatter-Gather Array
+~~~~~~~~~~~~~~~~~~~~
+
+The scatter-gather array is a contiguously allocated block of memory that
+tells the card the source and destination of each data-block to transfer.
+Card "addresses" are derived from the offset supplied by Mailbox #10. Host
+addresses are the physical memory location of the target DMA buffer.
+
+Each S-G array element is a struct of three 32-bit words. The first word is
+the source address, the second is the destination address. Both take up the
+entire 32 bits. The lowest 18 bits of the third word is the transfer byte
+count. The high-bit of the third word is the "last" flag. The last-flag tells
+the card to raise the DMA_DONE interrupt. From hard personal experience, if
+you forget to set this bit, the card will still "work" but the stream will
+most likely get corrupted.
+
+The transfer count must be a multiple of 256. Therefore, the driver will need
+to track how much data in the target buffer is valid and deal with it
+accordingly.
+
+Array Element:
+
+- 32-bit Source Address
+- 32-bit Destination Address
+- 14-bit reserved (high bit is the last flag)
+- 18-bit byte count
+
+DMA Transfer Status
+~~~~~~~~~~~~~~~~~~~
+
+Register 0x0004 holds the DMA Transfer Status:
+
+- bit 0: read completed
+- bit 1: write completed
+- bit 2: DMA read error
+- bit 3: DMA write error
+- bit 4: Scatter-Gather array error
diff --git a/Documentation/driver-api/media/drivers/cx88-devel.rst b/Documentation/driver-api/media/drivers/cx88-devel.rst
new file mode 100644
index 0000000000..cfe7c03f49
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/cx88-devel.rst
@@ -0,0 +1,113 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+The cx88 driver
+===============
+
+Author: Gerd Hoffmann
+
+Documentation missing at the cx88 datasheet
+-------------------------------------------
+
+MO_OUTPUT_FORMAT (0x310164)
+
+.. code-block:: none
+
+ Previous default from DScaler: 0x1c1f0008
+ Digit 8: 31-28
+ 28: PREVREMOD = 1
+
+ Digit 7: 27-24 (0xc = 12 = b1100 )
+ 27: COMBALT = 1
+ 26: PAL_INV_PHASE
+ (DScaler apparently set this to 1, resulted in sucky picture)
+
+ Digits 6,5: 23-16
+ 25-16: COMB_RANGE = 0x1f [default] (9 bits -> max 512)
+
+ Digit 4: 15-12
+ 15: DISIFX = 0
+ 14: INVCBF = 0
+ 13: DISADAPT = 0
+ 12: NARROWADAPT = 0
+
+ Digit 3: 11-8
+ 11: FORCE2H
+ 10: FORCEREMD
+ 9: NCHROMAEN
+ 8: NREMODEN
+
+ Digit 2: 7-4
+ 7-6: YCORE
+ 5-4: CCORE
+
+ Digit 1: 3-0
+ 3: RANGE = 1
+ 2: HACTEXT
+ 1: HSFMT
+
+0x47 is the sync byte for MPEG-2 transport stream packets.
+Datasheet incorrectly states to use 47 decimal. 188 is the length.
+All DVB compliant frontends output packets with this start code.
+
+Hauppauge WinTV cx88 IR information
+-----------------------------------
+
+The controls for the mux are GPIO [0,1] for source, and GPIO 2 for muting.
+
+====== ======== =================================================
+GPIO0 GPIO1
+====== ======== =================================================
+ 0 0 TV Audio
+ 1 0 FM radio
+ 0 1 Line-In
+ 1 1 Mono tuner bypass or CD passthru (tuner specific)
+====== ======== =================================================
+
+GPIO 16(I believe) is tied to the IR port (if present).
+
+
+From the data sheet:
+
+- Register 24'h20004 PCI Interrupt Status
+
+ - bit [18] IR_SMP_INT Set when 32 input samples have been collected over
+ - gpio[16] pin into GP_SAMPLE register.
+
+What's missing from the data sheet:
+
+- Setup 4KHz sampling rate (roughly 2x oversampled; good enough for our RC5
+ compat remote)
+- set register 0x35C050 to 0xa80a80
+- enable sampling
+- set register 0x35C054 to 0x5
+- enable the IRQ bit 18 in the interrupt mask register (and
+ provide for a handler)
+
+GP_SAMPLE register is at 0x35C058
+
+Bits are then right shifted into the GP_SAMPLE register at the specified
+rate; you get an interrupt when a full DWORD is received.
+You need to recover the actual RC5 bits out of the (oversampled) IR sensor
+bits. (Hint: look for the 0/1and 1/0 crossings of the RC5 bi-phase data) An
+actual raw RC5 code will span 2-3 DWORDS, depending on the actual alignment.
+
+I'm pretty sure when no IR signal is present the receiver is always in a
+marking state(1); but stray light, etc can cause intermittent noise values
+as well. Remember, this is a free running sample of the IR receiver state
+over time, so don't assume any sample starts at any particular place.
+
+Additional info
+~~~~~~~~~~~~~~~
+
+This data sheet (google search) seems to have a lovely description of the
+RC5 basics:
+http://www.atmel.com/dyn/resources/prod_documents/doc2817.pdf
+
+This document has more data:
+http://www.nenya.be/beor/electronics/rc5.htm
+
+This document has a how to decode a bi-phase data stream:
+http://www.ee.washington.edu/circuit_archive/text/ir_decode.txt
+
+This document has still more info:
+http://www.xs4all.nl/~sbp/knowledge/ir/rc5.htm
diff --git a/Documentation/driver-api/media/drivers/dvb-usb.rst b/Documentation/driver-api/media/drivers/dvb-usb.rst
new file mode 100644
index 0000000000..b2d5d9e62b
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/dvb-usb.rst
@@ -0,0 +1,357 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Idea behind the dvb-usb-framework
+=================================
+
+.. note::
+
+ #) This documentation is outdated. Please check at the DVB wiki
+ at https://linuxtv.org/wiki for more updated info.
+
+ #) **deprecated:** Newer DVB USB drivers should use the dvb-usb-v2 framework.
+
+In March 2005 I got the new Twinhan USB2.0 DVB-T device. They provided specs
+and a firmware.
+
+Quite keen I wanted to put the driver (with some quirks of course) into dibusb.
+After reading some specs and doing some USB snooping, it realized, that the
+dibusb-driver would be a complete mess afterwards. So I decided to do it in a
+different way: With the help of a dvb-usb-framework.
+
+The framework provides generic functions (mostly kernel API calls), such as:
+
+- Transport Stream URB handling in conjunction with dvb-demux-feed-control
+ (bulk and isoc are supported)
+- registering the device for the DVB-API
+- registering an I2C-adapter if applicable
+- remote-control/input-device handling
+- firmware requesting and loading (currently just for the Cypress USB
+ controllers)
+- other functions/methods which can be shared by several drivers (such as
+ functions for bulk-control-commands)
+- TODO: a I2C-chunker. It creates device-specific chunks of register-accesses
+ depending on length of a register and the number of values that can be
+ multi-written and multi-read.
+
+The source code of the particular DVB USB devices does just the communication
+with the device via the bus. The connection between the DVB-API-functionality
+is done via callbacks, assigned in a static device-description (struct
+dvb_usb_device) each device-driver has to have.
+
+For an example have a look in drivers/media/usb/dvb-usb/vp7045*.
+
+Objective is to migrate all the usb-devices (dibusb, cinergyT2, maybe the
+ttusb; flexcop-usb already benefits from the generic flexcop-device) to use
+the dvb-usb-lib.
+
+TODO: dynamic enabling and disabling of the pid-filter in regard to number of
+feeds requested.
+
+Supported devices
+-----------------
+
+See the LinuxTV DVB Wiki at https://linuxtv.org for a complete list of
+cards/drivers/firmwares:
+https://linuxtv.org/wiki/index.php/DVB_USB
+
+0. History & News:
+
+ 2005-06-30
+
+ - added support for WideView WT-220U (Thanks to Steve Chang)
+
+ 2005-05-30
+
+ - added basic isochronous support to the dvb-usb-framework
+ - added support for Conexant Hybrid reference design and Nebula
+ DigiTV USB
+
+ 2005-04-17
+
+ - all dibusb devices ported to make use of the dvb-usb-framework
+
+ 2005-04-02
+
+ - re-enabled and improved remote control code.
+
+ 2005-03-31
+
+ - ported the Yakumo/Hama/Typhoon DVB-T USB2.0 device to dvb-usb.
+
+ 2005-03-30
+
+ - first commit of the dvb-usb-module based on the dibusb-source.
+ First device is a new driver for the
+ TwinhanDTV Alpha / MagicBox II USB2.0-only DVB-T device.
+ - (change from dvb-dibusb to dvb-usb)
+
+ 2005-03-28
+
+ - added support for the AVerMedia AverTV DVB-T USB2.0 device
+ (Thanks to Glen Harris and Jiun-Kuei Jung, AVerMedia)
+
+ 2005-03-14
+
+ - added support for the Typhoon/Yakumo/HAMA DVB-T mobile USB2.0
+
+ 2005-02-11
+
+ - added support for the KWorld/ADSTech Instant DVB-T USB2.0.
+ Thanks a lot to Joachim von Caron
+
+ 2005-02-02
+ - added support for the Hauppauge Win-TV Nova-T USB2
+
+ 2005-01-31
+ - distorted streaming is gone for USB1.1 devices
+
+ 2005-01-13
+
+ - moved the mirrored pid_filter_table back to dvb-dibusb
+ first almost working version for HanfTek UMT-010
+ found out, that Yakumo/HAMA/Typhoon are predecessors of the HanfTek UMT-010
+
+ 2005-01-10
+
+ - refactoring completed, now everything is very delightful
+
+ - tuner quirks for some weird devices (Artec T1 AN2235 device has sometimes a
+ Panasonic Tuner assembled). Tunerprobing implemented.
+ Thanks a lot to Gunnar Wittich.
+
+ 2004-12-29
+
+ - after several days of struggling around bug of no returning URBs fixed.
+
+ 2004-12-26
+
+ - refactored the dibusb-driver, split into separate files
+ - i2c-probing enabled
+
+ 2004-12-06
+
+ - possibility for demod i2c-address probing
+ - new usb IDs (Compro, Artec)
+
+ 2004-11-23
+
+ - merged changes from DiB3000MC_ver2.1
+ - revised the debugging
+ - possibility to deliver the complete TS for USB2.0
+
+ 2004-11-21
+
+ - first working version of the dib3000mc/p frontend driver.
+
+ 2004-11-12
+
+ - added additional remote control keys. Thanks to Uwe Hanke.
+
+ 2004-11-07
+
+ - added remote control support. Thanks to David Matthews.
+
+ 2004-11-05
+
+ - added support for a new devices (Grandtec/Avermedia/Artec)
+ - merged my changes (for dib3000mb/dibusb) to the FE_REFACTORING, because it became HEAD
+ - moved transfer control (pid filter, fifo control) from usb driver to frontend, it seems
+ better settled there (added xfer_ops-struct)
+ - created a common files for frontends (mc/p/mb)
+
+ 2004-09-28
+
+ - added support for a new device (Unknown, vendor ID is Hyper-Paltek)
+
+ 2004-09-20
+
+ - added support for a new device (Compro DVB-U2000), thanks
+ to Amaury Demol for reporting
+ - changed usb TS transfer method (several urbs, stopping transfer
+ before setting a new pid)
+
+ 2004-09-13
+
+ - added support for a new device (Artec T1 USB TVBOX), thanks
+ to Christian Motschke for reporting
+
+ 2004-09-05
+
+ - released the dibusb device and dib3000mb-frontend driver
+ (old news for vp7041.c)
+
+ 2004-07-15
+
+ - found out, by accident, that the device has a TUA6010XS for PLL
+
+ 2004-07-12
+
+ - figured out, that the driver should also work with the
+ CTS Portable (Chinese Television System)
+
+ 2004-07-08
+
+ - firmware-extraction-2.422-problem solved, driver is now working
+ properly with firmware extracted from 2.422
+ - #if for 2.6.4 (dvb), compile issue
+ - changed firmware handling, see vp7041.txt sec 1.1
+
+ 2004-07-02
+
+ - some tuner modifications, v0.1, cleanups, first public
+
+ 2004-06-28
+
+ - now using the dvb_dmx_swfilter_packets, everything runs fine now
+
+ 2004-06-27
+
+ - able to watch and switching channels (pre-alpha)
+ - no section filtering yet
+
+ 2004-06-06
+
+ - first TS received, but kernel oops :/
+
+ 2004-05-14
+
+ - firmware loader is working
+
+ 2004-05-11
+
+ - start writing the driver
+
+How to use?
+-----------
+
+Firmware
+~~~~~~~~
+
+Most of the USB drivers need to download a firmware to the device before start
+working.
+
+Have a look at the Wikipage for the DVB-USB-drivers to find out, which firmware
+you need for your device:
+
+https://linuxtv.org/wiki/index.php/DVB_USB
+
+Compiling
+~~~~~~~~~
+
+Since the driver is in the linux kernel, activating the driver in
+your favorite config-environment should sufficient. I recommend
+to compile the driver as module. Hotplug does the rest.
+
+If you use dvb-kernel enter the build-2.6 directory run 'make' and 'insmod.sh
+load' afterwards.
+
+Loading the drivers
+~~~~~~~~~~~~~~~~~~~
+
+Hotplug is able to load the driver, when it is needed (because you plugged
+in the device).
+
+If you want to enable debug output, you have to load the driver manually and
+from within the dvb-kernel cvs repository.
+
+first have a look, which debug level are available:
+
+.. code-block:: none
+
+ # modinfo dvb-usb
+ # modinfo dvb-usb-vp7045
+
+ etc.
+
+.. code-block:: none
+
+ modprobe dvb-usb debug=<level>
+ modprobe dvb-usb-vp7045 debug=<level>
+ etc.
+
+should do the trick.
+
+When the driver is loaded successfully, the firmware file was in
+the right place and the device is connected, the "Power"-LED should be
+turned on.
+
+At this point you should be able to start a dvb-capable application. I'm use
+(t|s)zap, mplayer and dvbscan to test the basics. VDR-xine provides the
+long-term test scenario.
+
+Known problems and bugs
+-----------------------
+
+- Don't remove the USB device while running an DVB application, your system
+ will go crazy or die most likely.
+
+Adding support for devices
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+TODO
+
+USB1.1 Bandwidth limitation
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+A lot of the currently supported devices are USB1.1 and thus they have a
+maximum bandwidth of about 5-6 MBit/s when connected to a USB2.0 hub.
+This is not enough for receiving the complete transport stream of a
+DVB-T channel (which is about 16 MBit/s). Normally this is not a
+problem, if you only want to watch TV (this does not apply for HDTV),
+but watching a channel while recording another channel on the same
+frequency simply does not work very well. This applies to all USB1.1
+DVB-T devices, not just the dvb-usb-devices)
+
+The bug, where the TS is distorted by a heavy usage of the device is gone
+definitely. All dvb-usb-devices I was using (Twinhan, Kworld, DiBcom) are
+working like charm now with VDR. Sometimes I even was able to record a channel
+and watch another one.
+
+Comments
+~~~~~~~~
+
+Patches, comments and suggestions are very very welcome.
+
+3. Acknowledgements
+-------------------
+
+ Amaury Demol (Amaury.Demol@parrot.com) and Francois Kanounnikoff from DiBcom for
+ providing specs, code and help, on which the dvb-dibusb, dib3000mb and
+ dib3000mc are based.
+
+ David Matthews for identifying a new device type (Artec T1 with AN2235)
+ and for extending dibusb with remote control event handling. Thank you.
+
+ Alex Woods for frequently answering question about usb and dvb
+ stuff, a big thank you.
+
+ Bernd Wagner for helping with huge bug reports and discussions.
+
+ Gunnar Wittich and Joachim von Caron for their trust for providing
+ root-shells on their machines to implement support for new devices.
+
+ Allan Third and Michael Hutchinson for their help to write the Nebula
+ digitv-driver.
+
+ Glen Harris for bringing up, that there is a new dibusb-device and Jiun-Kuei
+ Jung from AVerMedia who kindly provided a special firmware to get the device
+ up and running in Linux.
+
+ Jennifer Chen, Jeff and Jack from Twinhan for kindly supporting by
+ writing the vp7045-driver.
+
+ Steve Chang from WideView for providing information for new devices and
+ firmware files.
+
+ Michael Paxton for submitting remote control keymaps.
+
+ Some guys on the linux-dvb mailing list for encouraging me.
+
+ Peter Schildmann >peter.schildmann-nospam-at-web.de< for his
+ user-level firmware loader, which saves a lot of time
+ (when writing the vp7041 driver)
+
+ Ulf Hermenau for helping me out with traditional chinese.
+
+ André Smoktun and Christian Frömmel for supporting me with
+ hardware and listening to my problems very patiently.
diff --git a/Documentation/driver-api/media/drivers/fimc-devel.rst b/Documentation/driver-api/media/drivers/fimc-devel.rst
new file mode 100644
index 0000000000..4c6b7c8be1
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/fimc-devel.rst
@@ -0,0 +1,33 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. include:: <isonum.txt>
+
+The Samsung S5P/EXYNOS4 FIMC driver
+===================================
+
+Copyright |copy| 2012 - 2013 Samsung Electronics Co., Ltd.
+
+Files partitioning
+------------------
+
+- media device driver
+
+ drivers/media/platform/samsung/exynos4-is/media-dev.[ch]
+
+- camera capture video device driver
+
+ drivers/media/platform/samsung/exynos4-is/fimc-capture.c
+
+- MIPI-CSI2 receiver subdev
+
+ drivers/media/platform/samsung/exynos4-is/mipi-csis.[ch]
+
+- video post-processor (mem-to-mem)
+
+ drivers/media/platform/samsung/exynos4-is/fimc-core.c
+
+- common files
+
+ drivers/media/platform/samsung/exynos4-is/fimc-core.h
+ drivers/media/platform/samsung/exynos4-is/fimc-reg.h
+ drivers/media/platform/samsung/exynos4-is/regs-fimc.h
diff --git a/Documentation/driver-api/media/drivers/frontends.rst b/Documentation/driver-api/media/drivers/frontends.rst
new file mode 100644
index 0000000000..7b8336ece6
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/frontends.rst
@@ -0,0 +1,32 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+****************
+Frontend drivers
+****************
+
+Frontend attach headers
+***********************
+
+.. Keep it on alphabetic order
+
+.. kernel-doc:: drivers/media/dvb-frontends/a8293.h
+.. kernel-doc:: drivers/media/dvb-frontends/af9013.h
+.. kernel-doc:: drivers/media/dvb-frontends/ascot2e.h
+.. kernel-doc:: drivers/media/dvb-frontends/cxd2820r.h
+.. kernel-doc:: drivers/media/dvb-frontends/drxk.h
+.. kernel-doc:: drivers/media/dvb-frontends/dvb-pll.h
+.. kernel-doc:: drivers/media/dvb-frontends/helene.h
+.. kernel-doc:: drivers/media/dvb-frontends/horus3a.h
+.. kernel-doc:: drivers/media/dvb-frontends/ix2505v.h
+.. kernel-doc:: drivers/media/dvb-frontends/m88ds3103.h
+.. kernel-doc:: drivers/media/dvb-frontends/mb86a20s.h
+.. kernel-doc:: drivers/media/dvb-frontends/mn88472.h
+.. kernel-doc:: drivers/media/dvb-frontends/rtl2830.h
+.. kernel-doc:: drivers/media/dvb-frontends/rtl2832.h
+.. kernel-doc:: drivers/media/dvb-frontends/rtl2832_sdr.h
+.. kernel-doc:: drivers/media/dvb-frontends/stb6000.h
+.. kernel-doc:: drivers/media/dvb-frontends/tda10071.h
+.. kernel-doc:: drivers/media/dvb-frontends/tda826x.h
+.. kernel-doc:: drivers/media/dvb-frontends/zd1301_demod.h
+.. kernel-doc:: drivers/media/dvb-frontends/zl10036.h
+
diff --git a/Documentation/driver-api/media/drivers/index.rst b/Documentation/driver-api/media/drivers/index.rst
new file mode 100644
index 0000000000..c4123a16b5
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/index.rst
@@ -0,0 +1,40 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. include:: <isonum.txt>
+
+===================================
+Media driver-specific documentation
+===================================
+
+Video4Linux (V4L) drivers
+=========================
+
+.. toctree::
+ :maxdepth: 5
+
+ bttv-devel
+ cx2341x-devel
+ cx88-devel
+ fimc-devel
+ pvrusb2
+ pxa_camera
+ radiotrack
+ rkisp1
+ saa7134-devel
+ sh_mobile_ceu_camera
+ tuners
+ vimc-devel
+ zoran
+ ccs/ccs
+
+
+Digital TV drivers
+==================
+
+.. toctree::
+ :maxdepth: 5
+
+ dvb-usb
+ frontends
+ vidtv
+ contributors
diff --git a/Documentation/driver-api/media/drivers/pvrusb2.rst b/Documentation/driver-api/media/drivers/pvrusb2.rst
new file mode 100644
index 0000000000..cbd9359c24
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/pvrusb2.rst
@@ -0,0 +1,202 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+The pvrusb2 driver
+==================
+
+Author: Mike Isely <isely@pobox.com>
+
+Background
+----------
+
+This driver is intended for the "Hauppauge WinTV PVR USB 2.0", which
+is a USB 2.0 hosted TV Tuner. This driver is a work in progress.
+Its history started with the reverse-engineering effort by Björn
+Danielsson <pvrusb2@dax.nu> whose web page can be found here:
+http://pvrusb2.dax.nu/
+
+From there Aurelien Alleaume <slts@free.fr> began an effort to
+create a video4linux compatible driver. I began with Aurelien's
+last known snapshot and evolved the driver to the state it is in
+here.
+
+More information on this driver can be found at:
+https://www.isely.net/pvrusb2.html
+
+
+This driver has a strong separation of layers. They are very
+roughly:
+
+1. Low level wire-protocol implementation with the device.
+
+2. I2C adaptor implementation and corresponding I2C client drivers
+ implemented elsewhere in V4L.
+
+3. High level hardware driver implementation which coordinates all
+ activities that ensure correct operation of the device.
+
+4. A "context" layer which manages instancing of driver, setup,
+ tear-down, arbitration, and interaction with high level
+ interfaces appropriately as devices are hotplugged in the
+ system.
+
+5. High level interfaces which glue the driver to various published
+ Linux APIs (V4L, sysfs, maybe DVB in the future).
+
+The most important shearing layer is between the top 2 layers. A
+lot of work went into the driver to ensure that any kind of
+conceivable API can be laid on top of the core driver. (Yes, the
+driver internally leverages V4L to do its work but that really has
+nothing to do with the API published by the driver to the outside
+world.) The architecture allows for different APIs to
+simultaneously access the driver. I have a strong sense of fairness
+about APIs and also feel that it is a good design principle to keep
+implementation and interface isolated from each other. Thus while
+right now the V4L high level interface is the most complete, the
+sysfs high level interface will work equally well for similar
+functions, and there's no reason I see right now why it shouldn't be
+possible to produce a DVB high level interface that can sit right
+alongside V4L.
+
+Building
+--------
+
+To build these modules essentially amounts to just running "Make",
+but you need the kernel source tree nearby and you will likely also
+want to set a few controlling environment variables first in order
+to link things up with that source tree. Please see the Makefile
+here for comments that explain how to do that.
+
+Source file list / functional overview
+--------------------------------------
+
+(Note: The term "module" used below generally refers to loosely
+defined functional units within the pvrusb2 driver and bears no
+relation to the Linux kernel's concept of a loadable module.)
+
+pvrusb2-audio.[ch] - This is glue logic that resides between this
+ driver and the msp3400.ko I2C client driver (which is found
+ elsewhere in V4L).
+
+pvrusb2-context.[ch] - This module implements the context for an
+ instance of the driver. Everything else eventually ties back to
+ or is otherwise instanced within the data structures implemented
+ here. Hotplugging is ultimately coordinated here. All high level
+ interfaces tie into the driver through this module. This module
+ helps arbitrate each interface's access to the actual driver core,
+ and is designed to allow concurrent access through multiple
+ instances of multiple interfaces (thus you can for example change
+ the tuner's frequency through sysfs while simultaneously streaming
+ video through V4L out to an instance of mplayer).
+
+pvrusb2-debug.h - This header defines a printk() wrapper and a mask
+ of debugging bit definitions for the various kinds of debug
+ messages that can be enabled within the driver.
+
+pvrusb2-debugifc.[ch] - This module implements a crude command line
+ oriented debug interface into the driver. Aside from being part
+ of the process for implementing manual firmware extraction (see
+ the pvrusb2 web site mentioned earlier), probably I'm the only one
+ who has ever used this. It is mainly a debugging aid.
+
+pvrusb2-eeprom.[ch] - This is glue logic that resides between this
+ driver the tveeprom.ko module, which is itself implemented
+ elsewhere in V4L.
+
+pvrusb2-encoder.[ch] - This module implements all protocol needed to
+ interact with the Conexant mpeg2 encoder chip within the pvrusb2
+ device. It is a crude echo of corresponding logic in ivtv,
+ however the design goals (strict isolation) and physical layer
+ (proxy through USB instead of PCI) are enough different that this
+ implementation had to be completely different.
+
+pvrusb2-hdw-internal.h - This header defines the core data structure
+ in the driver used to track ALL internal state related to control
+ of the hardware. Nobody outside of the core hardware-handling
+ modules should have any business using this header. All external
+ access to the driver should be through one of the high level
+ interfaces (e.g. V4L, sysfs, etc), and in fact even those high
+ level interfaces are restricted to the API defined in
+ pvrusb2-hdw.h and NOT this header.
+
+pvrusb2-hdw.h - This header defines the full internal API for
+ controlling the hardware. High level interfaces (e.g. V4L, sysfs)
+ will work through here.
+
+pvrusb2-hdw.c - This module implements all the various bits of logic
+ that handle overall control of a specific pvrusb2 device.
+ (Policy, instantiation, and arbitration of pvrusb2 devices fall
+ within the jurisdiction of pvrusb-context not here).
+
+pvrusb2-i2c-chips-\*.c - These modules implement the glue logic to
+ tie together and configure various I2C modules as they attach to
+ the I2C bus. There are two versions of this file. The "v4l2"
+ version is intended to be used in-tree alongside V4L, where we
+ implement just the logic that makes sense for a pure V4L
+ environment. The "all" version is intended for use outside of
+ V4L, where we might encounter other possibly "challenging" modules
+ from ivtv or older kernel snapshots (or even the support modules
+ in the standalone snapshot).
+
+pvrusb2-i2c-cmd-v4l1.[ch] - This module implements generic V4L1
+ compatible commands to the I2C modules. It is here where state
+ changes inside the pvrusb2 driver are translated into V4L1
+ commands that are in turn send to the various I2C modules.
+
+pvrusb2-i2c-cmd-v4l2.[ch] - This module implements generic V4L2
+ compatible commands to the I2C modules. It is here where state
+ changes inside the pvrusb2 driver are translated into V4L2
+ commands that are in turn send to the various I2C modules.
+
+pvrusb2-i2c-core.[ch] - This module provides an implementation of a
+ kernel-friendly I2C adaptor driver, through which other external
+ I2C client drivers (e.g. msp3400, tuner, lirc) may connect and
+ operate corresponding chips within the pvrusb2 device. It is
+ through here that other V4L modules can reach into this driver to
+ operate specific pieces (and those modules are in turn driven by
+ glue logic which is coordinated by pvrusb2-hdw, doled out by
+ pvrusb2-context, and then ultimately made available to users
+ through one of the high level interfaces).
+
+pvrusb2-io.[ch] - This module implements a very low level ring of
+ transfer buffers, required in order to stream data from the
+ device. This module is *very* low level. It only operates the
+ buffers and makes no attempt to define any policy or mechanism for
+ how such buffers might be used.
+
+pvrusb2-ioread.[ch] - This module layers on top of pvrusb2-io.[ch]
+ to provide a streaming API usable by a read() system call style of
+ I/O. Right now this is the only layer on top of pvrusb2-io.[ch],
+ however the underlying architecture here was intended to allow for
+ other styles of I/O to be implemented with additional modules, like
+ mmap()'ed buffers or something even more exotic.
+
+pvrusb2-main.c - This is the top level of the driver. Module level
+ and USB core entry points are here. This is our "main".
+
+pvrusb2-sysfs.[ch] - This is the high level interface which ties the
+ pvrusb2 driver into sysfs. Through this interface you can do
+ everything with the driver except actually stream data.
+
+pvrusb2-tuner.[ch] - This is glue logic that resides between this
+ driver and the tuner.ko I2C client driver (which is found
+ elsewhere in V4L).
+
+pvrusb2-util.h - This header defines some common macros used
+ throughout the driver. These macros are not really specific to
+ the driver, but they had to go somewhere.
+
+pvrusb2-v4l2.[ch] - This is the high level interface which ties the
+ pvrusb2 driver into video4linux. It is through here that V4L
+ applications can open and operate the driver in the usual V4L
+ ways. Note that **ALL** V4L functionality is published only
+ through here and nowhere else.
+
+pvrusb2-video-\*.[ch] - This is glue logic that resides between this
+ driver and the saa711x.ko I2C client driver (which is found
+ elsewhere in V4L). Note that saa711x.ko used to be known as
+ saa7115.ko in ivtv. There are two versions of this; one is
+ selected depending on the particular saa711[5x].ko that is found.
+
+pvrusb2.h - This header contains compile time tunable parameters
+ (and at the moment the driver has very little that needs to be
+ tuned).
diff --git a/Documentation/driver-api/media/drivers/pxa_camera.rst b/Documentation/driver-api/media/drivers/pxa_camera.rst
new file mode 100644
index 0000000000..46919919ba
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/pxa_camera.rst
@@ -0,0 +1,194 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+PXA-Camera Host Driver
+======================
+
+Author: Robert Jarzmik <robert.jarzmik@free.fr>
+
+Constraints
+-----------
+
+a) Image size for YUV422P format
+ All YUV422P images are enforced to have width x height % 16 = 0.
+ This is due to DMA constraints, which transfers only planes of 8 byte
+ multiples.
+
+
+Global video workflow
+---------------------
+
+a) QCI stopped
+ Initially, the QCI interface is stopped.
+ When a buffer is queued, start_streaming is called and the QCI starts.
+
+b) QCI started
+ More buffers can be queued while the QCI is started without halting the
+ capture. The new buffers are "appended" at the tail of the DMA chain, and
+ smoothly captured one frame after the other.
+
+ Once a buffer is filled in the QCI interface, it is marked as "DONE" and
+ removed from the active buffers list. It can be then requeud or dequeued by
+ userland application.
+
+ Once the last buffer is filled in, the QCI interface stops.
+
+c) Capture global finite state machine schema
+
+.. code-block:: none
+
+ +----+ +---+ +----+
+ | DQ | | Q | | DQ |
+ | v | v | v
+ +-----------+ +------------------------+
+ | STOP | | Wait for capture start |
+ +-----------+ Q +------------------------+
+ +-> | QCI: stop | ------------------> | QCI: run | <------------+
+ | | DMA: stop | | DMA: stop | |
+ | +-----------+ +-----> +------------------------+ |
+ | / | |
+ | / +---+ +----+ | |
+ |capture list empty / | Q | | DQ | | QCI Irq EOF |
+ | / | v | v v |
+ | +--------------------+ +----------------------+ |
+ | | DMA hotlink missed | | Capture running | |
+ | +--------------------+ +----------------------+ |
+ | | QCI: run | +-----> | QCI: run | <-+ |
+ | | DMA: stop | / | DMA: run | | |
+ | +--------------------+ / +----------------------+ | Other |
+ | ^ /DMA still | | channels |
+ | | capture list / running | DMA Irq End | not |
+ | | not empty / | | finished |
+ | | / v | yet |
+ | +----------------------+ +----------------------+ | |
+ | | Videobuf released | | Channel completed | | |
+ | +----------------------+ +----------------------+ | |
+ +-- | QCI: run | | QCI: run | --+ |
+ | DMA: run | | DMA: run | |
+ +----------------------+ +----------------------+ |
+ ^ / | |
+ | no overrun / | overrun |
+ | / v |
+ +--------------------+ / +----------------------+ |
+ | Frame completed | / | Frame overran | |
+ +--------------------+ <-----+ +----------------------+ restart frame |
+ | QCI: run | | QCI: stop | --------------+
+ | DMA: run | | DMA: stop |
+ +--------------------+ +----------------------+
+
+ Legend: - each box is a FSM state
+ - each arrow is the condition to transition to another state
+ - an arrow with a comment is a mandatory transition (no condition)
+ - arrow "Q" means : a buffer was enqueued
+ - arrow "DQ" means : a buffer was dequeued
+ - "QCI: stop" means the QCI interface is not enabled
+ - "DMA: stop" means all 3 DMA channels are stopped
+ - "DMA: run" means at least 1 DMA channel is still running
+
+DMA usage
+---------
+
+a) DMA flow
+ - first buffer queued for capture
+ Once a first buffer is queued for capture, the QCI is started, but data
+ transfer is not started. On "End Of Frame" interrupt, the irq handler
+ starts the DMA chain.
+ - capture of one videobuffer
+ The DMA chain starts transferring data into videobuffer RAM pages.
+ When all pages are transferred, the DMA irq is raised on "ENDINTR" status
+ - finishing one videobuffer
+ The DMA irq handler marks the videobuffer as "done", and removes it from
+ the active running queue
+ Meanwhile, the next videobuffer (if there is one), is transferred by DMA
+ - finishing the last videobuffer
+ On the DMA irq of the last videobuffer, the QCI is stopped.
+
+b) DMA prepared buffer will have this structure
+
+.. code-block:: none
+
+ +------------+-----+---------------+-----------------+
+ | desc-sg[0] | ... | desc-sg[last] | finisher/linker |
+ +------------+-----+---------------+-----------------+
+
+This structure is pointed by dma->sg_cpu.
+The descriptors are used as follows:
+
+- desc-sg[i]: i-th descriptor, transferring the i-th sg
+ element to the video buffer scatter gather
+- finisher: has ddadr=DADDR_STOP, dcmd=ENDIRQEN
+- linker: has ddadr= desc-sg[0] of next video buffer, dcmd=0
+
+For the next schema, let's assume d0=desc-sg[0] .. dN=desc-sg[N],
+"f" stands for finisher and "l" for linker.
+A typical running chain is :
+
+.. code-block:: none
+
+ Videobuffer 1 Videobuffer 2
+ +---------+----+---+ +----+----+----+---+
+ | d0 | .. | dN | l | | d0 | .. | dN | f |
+ +---------+----+-|-+ ^----+----+----+---+
+ | |
+ +----+
+
+After the chaining is finished, the chain looks like :
+
+.. code-block:: none
+
+ Videobuffer 1 Videobuffer 2 Videobuffer 3
+ +---------+----+---+ +----+----+----+---+ +----+----+----+---+
+ | d0 | .. | dN | l | | d0 | .. | dN | l | | d0 | .. | dN | f |
+ +---------+----+-|-+ ^----+----+----+-|-+ ^----+----+----+---+
+ | | | |
+ +----+ +----+
+ new_link
+
+c) DMA hot chaining timeslice issue
+
+As DMA chaining is done while DMA _is_ running, the linking may be done
+while the DMA jumps from one Videobuffer to another. On the schema, that
+would be a problem if the following sequence is encountered :
+
+- DMA chain is Videobuffer1 + Videobuffer2
+- pxa_videobuf_queue() is called to queue Videobuffer3
+- DMA controller finishes Videobuffer2, and DMA stops
+
+.. code-block:: none
+
+ =>
+ Videobuffer 1 Videobuffer 2
+ +---------+----+---+ +----+----+----+---+
+ | d0 | .. | dN | l | | d0 | .. | dN | f |
+ +---------+----+-|-+ ^----+----+----+-^-+
+ | | |
+ +----+ +-- DMA DDADR loads DDADR_STOP
+
+- pxa_dma_add_tail_buf() is called, the Videobuffer2 "finisher" is
+ replaced by a "linker" to Videobuffer3 (creation of new_link)
+- pxa_videobuf_queue() finishes
+- the DMA irq handler is called, which terminates Videobuffer2
+- Videobuffer3 capture is not scheduled on DMA chain (as it stopped !!!)
+
+.. code-block:: none
+
+ Videobuffer 1 Videobuffer 2 Videobuffer 3
+ +---------+----+---+ +----+----+----+---+ +----+----+----+---+
+ | d0 | .. | dN | l | | d0 | .. | dN | l | | d0 | .. | dN | f |
+ +---------+----+-|-+ ^----+----+----+-|-+ ^----+----+----+---+
+ | | | |
+ +----+ +----+
+ new_link
+ DMA DDADR still is DDADR_STOP
+
+- pxa_camera_check_link_miss() is called
+ This checks if the DMA is finished and a buffer is still on the
+ pcdev->capture list. If that's the case, the capture will be restarted,
+ and Videobuffer3 is scheduled on DMA chain.
+- the DMA irq handler finishes
+
+.. note::
+
+ If DMA stops just after pxa_camera_check_link_miss() reads DDADR()
+ value, we have the guarantee that the DMA irq handler will be called back
+ when the DMA will finish the buffer, and pxa_camera_check_link_miss() will
+ be called again, to reschedule Videobuffer3.
diff --git a/Documentation/driver-api/media/drivers/radiotrack.rst b/Documentation/driver-api/media/drivers/radiotrack.rst
new file mode 100644
index 0000000000..a85cb6205d
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/radiotrack.rst
@@ -0,0 +1,168 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+The Radiotrack radio driver
+===========================
+
+Author: Stephen M. Benoit <benoits@servicepro.com>
+
+Date: Dec 14, 1996
+
+ACKNOWLEDGMENTS
+----------------
+
+This document was made based on 'C' code for Linux from Gideon le Grange
+(legrang@active.co.za or legrang@cs.sun.ac.za) in 1994, and elaborations from
+Frans Brinkman (brinkman@esd.nl) in 1996. The results reported here are from
+experiments that the author performed on his own setup, so your mileage may
+vary... I make no guarantees, claims or warranties to the suitability or
+validity of this information. No other documentation on the AIMS
+Lab (http://www.aimslab.com/) RadioTrack card was made available to the
+author. This document is offered in the hopes that it might help users who
+want to use the RadioTrack card in an environment other than MS Windows.
+
+WHY THIS DOCUMENT?
+------------------
+
+I have a RadioTrack card from back when I ran an MS-Windows platform. After
+converting to Linux, I found Gideon le Grange's command-line software for
+running the card, and found that it was good! Frans Brinkman made a
+comfortable X-windows interface, and added a scanning feature. For hack
+value, I wanted to see if the tuner could be tuned beyond the usual FM radio
+broadcast band, so I could pick up the audio carriers from North American
+broadcast TV channels, situated just below and above the 87.0-109.0 MHz range.
+I did not get much success, but I learned about programming ioports under
+Linux and gained some insights about the hardware design used for the card.
+
+So, without further delay, here are the details.
+
+
+PHYSICAL DESCRIPTION
+--------------------
+
+The RadioTrack card is an ISA 8-bit FM radio card. The radio frequency (RF)
+input is simply an antenna lead, and the output is a power audio signal
+available through a miniature phone plug. Its RF frequencies of operation are
+more or less limited from 87.0 to 109.0 MHz (the commercial FM broadcast
+band). Although the registers can be programmed to request frequencies beyond
+these limits, experiments did not give promising results. The variable
+frequency oscillator (VFO) that demodulates the intermediate frequency (IF)
+signal probably has a small range of useful frequencies, and wraps around or
+gets clipped beyond the limits mentioned above.
+
+
+CONTROLLING THE CARD WITH IOPORT
+--------------------------------
+
+The RadioTrack (base) ioport is configurable for 0x30c or 0x20c. Only one
+ioport seems to be involved. The ioport decoding circuitry must be pretty
+simple, as individual ioport bits are directly matched to specific functions
+(or blocks) of the radio card. This way, many functions can be changed in
+parallel with one write to the ioport. The only feedback available through
+the ioports appears to be the "Stereo Detect" bit.
+
+The bits of the ioport are arranged as follows:
+
+.. code-block:: none
+
+ MSb LSb
+ +------+------+------+--------+--------+-------+---------+--------+
+ | VolA | VolB | ???? | Stereo | Radio | TuneA | TuneB | Tune |
+ | (+) | (-) | | Detect | Audio | (bit) | (latch) | Update |
+ | | | | Enable | Enable | | | Enable |
+ +------+------+------+--------+--------+-------+---------+--------+
+
+
+==== ==== =================================
+VolA VolB Description
+==== ==== =================================
+0 0 audio mute
+0 1 volume + (some delay required)
+1 0 volume - (some delay required)
+1 1 stay at present volume
+==== ==== =================================
+
+==================== ===========
+Stereo Detect Enable Description
+==================== ===========
+0 No Detect
+1 Detect
+==================== ===========
+
+Results available by reading ioport >60 msec after last port write.
+
+ 0xff ==> no stereo detected, 0xfd ==> stereo detected.
+
+============================= =============================
+Radio to Audio (path) Enable Description
+============================= =============================
+0 Disable path (silence)
+1 Enable path (audio produced)
+============================= =============================
+
+===== ===== ==================
+TuneA TuneB Description
+===== ===== ==================
+0 0 "zero" bit phase 1
+0 1 "zero" bit phase 2
+1 0 "one" bit phase 1
+1 1 "one" bit phase 2
+===== ===== ==================
+
+
+24-bit code, where bits = (freq*40) + 10486188.
+The Most Significant 11 bits must be 1010 xxxx 0x0 to be valid.
+The bits are shifted in LSb first.
+
+================== ===========================
+Tune Update Enable Description
+================== ===========================
+0 Tuner held constant
+1 Tuner updating in progress
+================== ===========================
+
+
+PROGRAMMING EXAMPLES
+--------------------
+
+.. code-block:: none
+
+ Default: BASE <-- 0xc8 (current volume, no stereo detect,
+ radio enable, tuner adjust disable)
+
+ Card Off: BASE <-- 0x00 (audio mute, no stereo detect,
+ radio disable, tuner adjust disable)
+
+ Card On: BASE <-- 0x00 (see "Card Off", clears any unfinished business)
+ BASE <-- 0xc8 (see "Default")
+
+ Volume Down: BASE <-- 0x48 (volume down, no stereo detect,
+ radio enable, tuner adjust disable)
+ wait 10 msec
+ BASE <-- 0xc8 (see "Default")
+
+ Volume Up: BASE <-- 0x88 (volume up, no stereo detect,
+ radio enable, tuner adjust disable)
+ wait 10 msec
+ BASE <-- 0xc8 (see "Default")
+
+ Check Stereo: BASE <-- 0xd8 (current volume, stereo detect,
+ radio enable, tuner adjust disable)
+ wait 100 msec
+ x <-- BASE (read ioport)
+ BASE <-- 0xc8 (see "Default")
+
+ x=0xff ==> "not stereo", x=0xfd ==> "stereo detected"
+
+ Set Frequency: code = (freq*40) + 10486188
+ foreach of the 24 bits in code,
+ (from Least to Most Significant):
+ to write a "zero" bit,
+ BASE <-- 0x01 (audio mute, no stereo detect, radio
+ disable, "zero" bit phase 1, tuner adjust)
+ BASE <-- 0x03 (audio mute, no stereo detect, radio
+ disable, "zero" bit phase 2, tuner adjust)
+ to write a "one" bit,
+ BASE <-- 0x05 (audio mute, no stereo detect, radio
+ disable, "one" bit phase 1, tuner adjust)
+ BASE <-- 0x07 (audio mute, no stereo detect, radio
+ disable, "one" bit phase 2, tuner adjust)
diff --git a/Documentation/driver-api/media/drivers/rkisp1.rst b/Documentation/driver-api/media/drivers/rkisp1.rst
new file mode 100644
index 0000000000..ea336958a3
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/rkisp1.rst
@@ -0,0 +1,43 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+The Rockchip Image Signal Processor Driver (rkisp1)
+===================================================
+
+Versions and their differences
+------------------------------
+
+The rkisp1 block underwent some changes between SoC implementations.
+The vendor designates them as:
+
+- V10: used at least in rk3288 and rk3399
+- V11: declared in the original vendor code, but not used
+- V12: used at least in rk3326 and px30
+- V13: used at least in rk1808
+- V20: used in rk3568 and beyond
+
+Right now the kernel supports rkisp1 implementations based
+on V10 and V12 variants. V11 does not seem to be actually used
+and V13 will need some more additions but isn't researched yet,
+especially as it seems to be limited to the rk1808 which hasn't
+reached much market spread.
+
+V20 on the other hand will probably be used in future SoCs and
+has seen really big changes in the vendor kernel, so will need
+quite a bit of research.
+
+Changes from V10 to V12
+-----------------------
+
+- V12 supports a new CSI-host implementation but can still
+ also use the same implementation from V10
+- The module for lens shading correction got changed
+ from 12bit to 13bit width
+- The AWB and AEC modules got replaced to support finer
+ grained data collection
+
+Changes from V12 to V13
+-----------------------
+
+The list for V13 is incomplete and needs further investigation.
+
+- V13 does not support the old CSI-host implementation anymore
diff --git a/Documentation/driver-api/media/drivers/saa7134-devel.rst b/Documentation/driver-api/media/drivers/saa7134-devel.rst
new file mode 100644
index 0000000000..167fd729bc
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/saa7134-devel.rst
@@ -0,0 +1,67 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+The saa7134 driver
+==================
+
+Author Gerd Hoffmann
+
+
+Card Variations:
+----------------
+
+Cards can use either of these two crystals (xtal):
+
+- 32.11 MHz -> .audio_clock=0x187de7
+- 24.576MHz -> .audio_clock=0x200000 (xtal * .audio_clock = 51539600)
+
+Some details about 30/34/35:
+
+- saa7130 - low-price chip, doesn't have mute, that is why all those
+ cards should have .mute field defined in their tuner structure.
+
+- saa7134 - usual chip
+
+- saa7133/35 - saa7135 is probably a marketing decision, since all those
+ chips identifies itself as 33 on pci.
+
+LifeView GPIOs
+--------------
+
+This section was authored by: Peter Missel <peter.missel@onlinehome.de>
+
+- LifeView FlyTV Platinum FM (LR214WF)
+
+ - GP27 MDT2005 PB4 pin 10
+ - GP26 MDT2005 PB3 pin 9
+ - GP25 MDT2005 PB2 pin 8
+ - GP23 MDT2005 PB1 pin 7
+ - GP22 MDT2005 PB0 pin 6
+ - GP21 MDT2005 PB5 pin 11
+ - GP20 MDT2005 PB6 pin 12
+ - GP19 MDT2005 PB7 pin 13
+ - nc MDT2005 PA3 pin 2
+ - Remote MDT2005 PA2 pin 1
+ - GP18 MDT2005 PA1 pin 18
+ - nc MDT2005 PA0 pin 17 strap low
+ - GP17 Strap "GP7"=High
+ - GP16 Strap "GP6"=High
+
+ - 0=Radio 1=TV
+ - Drives SA630D ENCH1 and HEF4052 A1 pinsto do FM radio through
+ SIF input
+
+ - GP15 nc
+ - GP14 nc
+ - GP13 nc
+ - GP12 Strap "GP5" = High
+ - GP11 Strap "GP4" = High
+ - GP10 Strap "GP3" = High
+ - GP09 Strap "GP2" = Low
+ - GP08 Strap "GP1" = Low
+ - GP07.00 nc
+
+Credits
+-------
+
+andrew.stevens@philips.com + werner.leeb@philips.com for providing
+saa7134 hardware specs and sample board.
diff --git a/Documentation/driver-api/media/drivers/sh_mobile_ceu_camera.rst b/Documentation/driver-api/media/drivers/sh_mobile_ceu_camera.rst
new file mode 100644
index 0000000000..822fcb8368
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/sh_mobile_ceu_camera.rst
@@ -0,0 +1,142 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Cropping and Scaling algorithm, used in the sh_mobile_ceu_camera driver
+=======================================================================
+
+Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+
+Terminology
+-----------
+
+sensor scales: horizontal and vertical scales, configured by the sensor driver
+host scales: -"- host driver
+combined scales: sensor_scale * host_scale
+
+
+Generic scaling / cropping scheme
+---------------------------------
+
+.. code-block:: none
+
+ -1--
+ |
+ -2-- -\
+ | --\
+ | --\
+ +-5-- . -- -3-- -\
+ | `... -\
+ | `... -4-- . - -7..
+ | `.
+ | `. .6--
+ |
+ | . .6'-
+ | .´
+ | ... -4'- .´
+ | ...´ - -7'.
+ +-5'- .´ -/
+ | -- -3'- -/
+ | --/
+ | --/
+ -2'- -/
+ |
+ |
+ -1'-
+
+In the above chart minuses and slashes represent "real" data amounts, points and
+accents represent "useful" data, basically, CEU scaled and cropped output,
+mapped back onto the client's source plane.
+
+Such a configuration can be produced by user requests:
+
+S_CROP(left / top = (5) - (1), width / height = (5') - (5))
+S_FMT(width / height = (6') - (6))
+
+Here:
+
+(1) to (1') - whole max width or height
+(1) to (2) - sensor cropped left or top
+(2) to (2') - sensor cropped width or height
+(3) to (3') - sensor scale
+(3) to (4) - CEU cropped left or top
+(4) to (4') - CEU cropped width or height
+(5) to (5') - reverse sensor scale applied to CEU cropped width or height
+(2) to (5) - reverse sensor scale applied to CEU cropped left or top
+(6) to (6') - CEU scale - user window
+
+
+S_FMT
+-----
+
+Do not touch input rectangle - it is already optimal.
+
+1. Calculate current sensor scales:
+
+ scale_s = ((2') - (2)) / ((3') - (3))
+
+2. Calculate "effective" input crop (sensor subwindow) - CEU crop scaled back at
+current sensor scales onto input window - this is user S_CROP:
+
+ width_u = (5') - (5) = ((4') - (4)) * scale_s
+
+3. Calculate new combined scales from "effective" input window to requested user
+window:
+
+ scale_comb = width_u / ((6') - (6))
+
+4. Calculate sensor output window by applying combined scales to real input
+window:
+
+ width_s_out = ((7') - (7)) = ((2') - (2)) / scale_comb
+
+5. Apply iterative sensor S_FMT for sensor output window.
+
+ subdev->video_ops->s_fmt(.width = width_s_out)
+
+6. Retrieve sensor output window (g_fmt)
+
+7. Calculate new sensor scales:
+
+ scale_s_new = ((3')_new - (3)_new) / ((2') - (2))
+
+8. Calculate new CEU crop - apply sensor scales to previously calculated
+"effective" crop:
+
+ width_ceu = (4')_new - (4)_new = width_u / scale_s_new
+ left_ceu = (4)_new - (3)_new = ((5) - (2)) / scale_s_new
+
+9. Use CEU cropping to crop to the new window:
+
+ ceu_crop(.width = width_ceu, .left = left_ceu)
+
+10. Use CEU scaling to scale to the requested user window:
+
+ scale_ceu = width_ceu / width
+
+
+S_CROP
+------
+
+The :ref:`V4L2 crop API <crop-scale>` says:
+
+"...specification does not define an origin or units. However by convention
+drivers should horizontally count unscaled samples relative to 0H."
+
+We choose to follow the advise and interpret cropping units as client input
+pixels.
+
+Cropping is performed in the following 6 steps:
+
+1. Request exactly user rectangle from the sensor.
+
+2. If smaller - iterate until a larger one is obtained. Result: sensor cropped
+ to 2 : 2', target crop 5 : 5', current output format 6' - 6.
+
+3. In the previous step the sensor has tried to preserve its output frame as
+ good as possible, but it could have changed. Retrieve it again.
+
+4. Sensor scaled to 3 : 3'. Sensor's scale is (2' - 2) / (3' - 3). Calculate
+ intermediate window: 4' - 4 = (5' - 5) * (3' - 3) / (2' - 2)
+
+5. Calculate and apply host scale = (6' - 6) / (4' - 4)
+
+6. Calculate and apply host crop: 6 - 7 = (5 - 2) * (6' - 6) / (5' - 5)
diff --git a/Documentation/driver-api/media/drivers/tuners.rst b/Documentation/driver-api/media/drivers/tuners.rst
new file mode 100644
index 0000000000..d7924141c5
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/tuners.rst
@@ -0,0 +1,133 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Tuner drivers
+=============
+
+Simple tuner Programming
+------------------------
+
+There are some flavors of Tuner programming APIs.
+These differ mainly by the bandswitch byte.
+
+- L= LG_API (VHF_LO=0x01, VHF_HI=0x02, UHF=0x08, radio=0x04)
+- P= PHILIPS_API (VHF_LO=0xA0, VHF_HI=0x90, UHF=0x30, radio=0x04)
+- T= TEMIC_API (VHF_LO=0x02, VHF_HI=0x04, UHF=0x01)
+- A= ALPS_API (VHF_LO=0x14, VHF_HI=0x12, UHF=0x11)
+- M= PHILIPS_MK3 (VHF_LO=0x01, VHF_HI=0x02, UHF=0x04, radio=0x19)
+
+Tuner Manufacturers
+-------------------
+
+- Samsung Tuner identification: (e.g. TCPM9091PD27)
+
+.. code-block:: none
+
+ TCP [ABCJLMNQ] 90[89][125] [DP] [ACD] 27 [ABCD]
+ [ABCJLMNQ]:
+ A= BG+DK
+ B= BG
+ C= I+DK
+ J= NTSC-Japan
+ L= Secam LL
+ M= BG+I+DK
+ N= NTSC
+ Q= BG+I+DK+LL
+ [89]: ?
+ [125]:
+ 2: No FM
+ 5: With FM
+ [DP]:
+ D= NTSC
+ P= PAL
+ [ACD]:
+ A= F-connector
+ C= Phono connector
+ D= Din Jack
+ [ABCD]:
+ 3-wire/I2C tuning, 2-band/3-band
+
+These Tuners are PHILIPS_API compatible.
+
+Philips Tuner identification: (e.g. FM1216MF)
+
+.. code-block:: none
+
+ F[IRMQ]12[1345]6{MF|ME|MP}
+ F[IRMQ]:
+ FI12x6: Tuner Series
+ FR12x6: Tuner + Radio IF
+ FM12x6: Tuner + FM
+ FQ12x6: special
+ FMR12x6: special
+ TD15xx: Digital Tuner ATSC
+ 12[1345]6:
+ 1216: PAL BG
+ 1236: NTSC
+ 1246: PAL I
+ 1256: Pal DK
+ {MF|ME|MP}
+ MF: BG LL w/ Secam (Multi France)
+ ME: BG DK I LL (Multi Europe)
+ MP: BG DK I (Multi PAL)
+ MR: BG DK M (?)
+ MG: BG DKI M (?)
+ MK2 series PHILIPS_API, most tuners are compatible to this one !
+ MK3 series introduced in 2002 w/ PHILIPS_MK3_API
+
+Temic Tuner identification: (.e.g 4006FH5)
+
+.. code-block:: none
+
+ 4[01][0136][269]F[HYNR]5
+ 40x2: Tuner (5V/33V), TEMIC_API.
+ 40x6: Tuner 5V
+ 41xx: Tuner compact
+ 40x9: Tuner+FM compact
+ [0136]
+ xx0x: PAL BG
+ xx1x: Pal DK, Secam LL
+ xx3x: NTSC
+ xx6x: PAL I
+ F[HYNR]5
+ FH5: Pal BG
+ FY5: others
+ FN5: multistandard
+ FR5: w/ FM radio
+ 3X xxxx: order number with specific connector
+ Note: Only 40x2 series has TEMIC_API, all newer tuners have PHILIPS_API.
+
+LG Innotek Tuner:
+
+- TPI8NSR11 : NTSC J/M (TPI8NSR01 w/FM) (P,210/497)
+- TPI8PSB11 : PAL B/G (TPI8PSB01 w/FM) (P,170/450)
+- TAPC-I701 : PAL I (TAPC-I001 w/FM) (P,170/450)
+- TPI8PSB12 : PAL D/K+B/G (TPI8PSB02 w/FM) (P,170/450)
+- TAPC-H701P: NTSC_JP (TAPC-H001P w/FM) (L,170/450)
+- TAPC-G701P: PAL B/G (TAPC-G001P w/FM) (L,170/450)
+- TAPC-W701P: PAL I (TAPC-W001P w/FM) (L,170/450)
+- TAPC-Q703P: PAL D/K (TAPC-Q001P w/FM) (L,170/450)
+- TAPC-Q704P: PAL D/K+I (L,170/450)
+- TAPC-G702P: PAL D/K+B/G (L,170/450)
+
+- TADC-H002F: NTSC (L,175/410?; 2-B, C-W+11, W+12-69)
+- TADC-M201D: PAL D/K+B/G+I (L,143/425) (sound control at I2C address 0xc8)
+- TADC-T003F: NTSC Taiwan (L,175/410?; 2-B, C-W+11, W+12-69)
+
+Suffix:
+ - P= Standard phono female socket
+ - D= IEC female socket
+ - F= F-connector
+
+Other Tuners:
+
+- TCL2002MB-1 : PAL BG + DK =TUNER_LG_PAL_NEW_TAPC
+- TCL2002MB-1F: PAL BG + DK w/FM =PHILIPS_PAL
+- TCL2002MI-2 : PAL I = ??
+
+ALPS Tuners:
+
+- Most are LG_API compatible
+- TSCH6 has ALPS_API (TSCH5 ?)
+- TSBE1 has extra API 05,02,08 Control_byte=0xCB Source:[#f1]_
+
+.. [#f1] conexant100029b-PCI-Decoder-ApplicationNote.pdf
diff --git a/Documentation/driver-api/media/drivers/vidtv.rst b/Documentation/driver-api/media/drivers/vidtv.rst
new file mode 100644
index 0000000000..54f269f478
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/vidtv.rst
@@ -0,0 +1,513 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+================================
+vidtv: Virtual Digital TV driver
+================================
+
+Author: Daniel W. S. Almeida <dwlsalmeida@gmail.com>, June 2020.
+
+Background
+----------
+
+Vidtv is a virtual DVB driver that aims to serve as a reference for driver
+writers by serving as a template. It also validates the existing media DVB
+APIs, thus helping userspace application writers.
+
+Currently, it consists of:
+
+- A fake tuner driver, which will report a bad signal quality if the chosen
+ frequency is too far away from a table of valid frequencies for a
+ particular delivery system.
+
+- A fake demod driver, which will constantly poll the fake signal quality
+ returned by the tuner, simulating a device that can lose/reacquire a lock
+ on the signal depending on the CNR levels.
+
+- A fake bridge driver, which is the module responsible for modprobing the
+ fake tuner and demod modules and implementing the demux logic. This module
+ takes parameters at initialization that will dictate how the simulation
+ behaves.
+
+- Code responsible for encoding a valid MPEG Transport Stream, which is then
+ passed to the bridge driver. This fake stream contains some hardcoded content.
+ For now, we have a single, audio-only channel containing a single MPEG
+ Elementary Stream, which in turn contains a SMPTE 302m encoded sine-wave.
+ Note that this particular encoder was chosen because it is the easiest
+ way to encode PCM audio data in a MPEG Transport Stream.
+
+Building vidtv
+--------------
+vidtv is a test driver and thus is **not** enabled by default when
+compiling the kernel.
+
+In order to enable compilation of vidtv:
+
+- Enable **DVB_TEST_DRIVERS**, then
+- Enable **DVB_VIDTV**
+
+When compiled as a module, expect the following .ko files:
+
+- dvb_vidtv_tuner.ko
+
+- dvb_vidtv_demod.ko
+
+- dvb_vidtv_bridge.ko
+
+Running vidtv
+-------------
+When compiled as a module, run::
+
+ modprobe vidtv
+
+That's it! The bridge driver will initialize the tuner and demod drivers as
+part of its own initialization.
+
+By default, it will accept the following frequencies:
+
+ - 474 MHz for DVB-T/T2/C;
+ - 11,362 GHz for DVB-S/S2.
+
+For satellite systems, the driver simulates an universal extended
+LNBf, with frequencies at Ku-Band, ranging from 10.7 GHz to 12.75 GHz.
+
+You can optionally define some command-line arguments to vidtv.
+
+Command-line arguments to vidtv
+-------------------------------
+Below is a list of all arguments that can be supplied to vidtv:
+
+drop_tslock_prob_on_low_snr
+ Probability of losing the TS lock if the signal quality is bad.
+ This probability be used by the fake demodulator driver to
+ eventually return a status of 0 when the signal quality is not
+ good.
+
+recover_tslock_prob_on_good_snr:
+ Probability recovering the TS lock when the signal improves. This
+ probability be used by the fake demodulator driver to eventually
+ return a status of 0x1f when/if the signal quality improves.
+
+mock_power_up_delay_msec
+ Simulate a power up delay. Default: 0.
+
+mock_tune_delay_msec
+ Simulate a tune delay. Default 0.
+
+vidtv_valid_dvb_t_freqs
+ Valid DVB-T frequencies to simulate, in Hz.
+
+vidtv_valid_dvb_c_freqs
+ Valid DVB-C frequencies to simulate, in Hz.
+
+vidtv_valid_dvb_s_freqs
+ Valid DVB-S/S2 frequencies to simulate at Ku-Band, in kHz.
+
+max_frequency_shift_hz,
+ Maximum shift in HZ allowed when tuning in a channel.
+
+si_period_msec
+ How often to send SI packets. Default: 40ms.
+
+pcr_period_msec
+ How often to send PCR packets. Default: 40ms.
+
+mux_rate_kbytes_sec
+ Attempt to maintain this bit rate by inserting TS null packets, if
+ necessary. Default: 4096.
+
+pcr_pid,
+ PCR PID for all channels. Default: 0x200.
+
+mux_buf_sz_pkts,
+ Size for the mux buffer in multiples of 188 bytes.
+
+vidtv internal structure
+------------------------
+The kernel modules are split in the following way:
+
+vidtv_tuner.[ch]
+ Implements a fake tuner DVB driver.
+
+vidtv_demod.[ch]
+ Implements a fake demodulator DVB driver.
+
+vidtv_bridge.[ch]
+ Implements a bridge driver.
+
+The MPEG related code is split in the following way:
+
+vidtv_ts.[ch]
+ Code to work with MPEG TS packets, such as TS headers, adaptation
+ fields, PCR packets and NULL packets.
+
+vidtv_psi.[ch]
+ This is the PSI generator. PSI packets contain general information
+ about a MPEG Transport Stream. A PSI generator is needed so
+ userspace apps can retrieve information about the Transport Stream
+ and eventually tune into a (dummy) channel.
+
+ Because the generator is implemented in a separate file, it can be
+ reused elsewhere in the media subsystem.
+
+ Currently vidtv supports working with 5 PSI tables: PAT, PMT,
+ SDT, NIT and EIT.
+
+ The specification for PAT and PMT can be found in *ISO 13818-1:
+ Systems*, while the specification for the SDT, NIT, EIT can be found in *ETSI
+ EN 300 468: Specification for Service Information (SI) in DVB
+ systems*.
+
+ It isn't strictly necessary, but using a real TS file helps when
+ debugging PSI tables. Vidtv currently tries to replicate the PSI
+ structure found in this file: `TS1Globo.ts
+ <https://tsduck.io/streams/brazil-isdb-tb/TS1globo.ts>`_.
+
+ A good way to visualize the structure of streams is by using
+ `DVBInspector <https://sourceforge.net/projects/dvbinspector/>`_.
+
+vidtv_pes.[ch]
+ Implements the PES logic to convert encoder data into MPEG TS
+ packets. These can then be fed into a TS multiplexer and eventually
+ into userspace.
+
+vidtv_encoder.h
+ An interface for vidtv encoders. New encoders can be added to this
+ driver by implementing the calls in this file.
+
+vidtv_s302m.[ch]
+ Implements a S302M encoder to make it possible to insert PCM audio
+ data in the generated MPEG Transport Stream. The relevant
+ specification is available online as *SMPTE 302M-2007: Television -
+ Mapping of AES3 Data into MPEG-2 Transport Stream*.
+
+
+ The resulting MPEG Elementary Stream is conveyed in a private
+ stream with a S302M registration descriptor attached.
+
+ This shall enable passing an audio signal into userspace so it can
+ be decoded and played by media software. The corresponding decoder
+ in ffmpeg is located in 'libavcodec/s302m.c' and is experimental.
+
+vidtv_channel.[ch]
+ Implements a 'channel' abstraction.
+
+ When vidtv boots, it will create some hardcoded channels:
+
+ #. Their services will be concatenated to populate the SDT.
+
+ #. Their programs will be concatenated to populate the PAT
+
+ #. Their events will be concatenated to populate the EIT
+
+ #. For each program in the PAT, a PMT section will be created
+
+ #. The PMT section for a channel will be assigned its streams.
+
+ #. Every stream will have its corresponding encoder polled in a
+ loop to produce TS packets.
+ These packets may be interleaved by the muxer and then delivered
+ to the bridge.
+
+vidtv_mux.[ch]
+ Implements a MPEG TS mux, loosely based on the ffmpeg
+ implementation in "libavcodec/mpegtsenc.c"
+
+ The muxer runs a loop which is responsible for:
+
+ #. Keeping track of the amount of time elapsed since the last
+ iteration.
+
+ #. Polling encoders in order to fetch 'elapsed_time' worth of data.
+
+ #. Inserting PSI and/or PCR packets, if needed.
+
+ #. Padding the resulting stream with NULL packets if
+ necessary in order to maintain the chosen bit rate.
+
+ #. Delivering the resulting TS packets to the bridge
+ driver so it can pass them to the demux.
+
+Testing vidtv with v4l-utils
+----------------------------
+
+Using the tools in v4l-utils is a great way to test and inspect the output of
+vidtv. It is hosted here: `v4l-utils Documentation
+<https://linuxtv.org/wiki/index.php/V4l-utils>`_.
+
+From its webpage::
+
+ The v4l-utils are a series of packages for handling media devices.
+
+ It is hosted at http://git.linuxtv.org/v4l-utils.git, and packaged
+ on most distributions.
+
+ It provides a series of libraries and utilities to be used to
+ control several aspect of the media boards.
+
+
+Start by installing v4l-utils and then modprobing vidtv::
+
+ modprobe dvb_vidtv_bridge
+
+If the driver is OK, it should load and its probing code will run. This will
+pull in the tuner and demod drivers.
+
+Using dvb-fe-tool
+~~~~~~~~~~~~~~~~~
+
+The first step to check whether the demod loaded successfully is to run::
+
+ $ dvb-fe-tool
+ Device Dummy demod for DVB-T/T2/C/S/S2 (/dev/dvb/adapter0/frontend0) capabilities:
+ CAN_FEC_1_2
+ CAN_FEC_2_3
+ CAN_FEC_3_4
+ CAN_FEC_4_5
+ CAN_FEC_5_6
+ CAN_FEC_6_7
+ CAN_FEC_7_8
+ CAN_FEC_8_9
+ CAN_FEC_AUTO
+ CAN_GUARD_INTERVAL_AUTO
+ CAN_HIERARCHY_AUTO
+ CAN_INVERSION_AUTO
+ CAN_QAM_16
+ CAN_QAM_32
+ CAN_QAM_64
+ CAN_QAM_128
+ CAN_QAM_256
+ CAN_QAM_AUTO
+ CAN_QPSK
+ CAN_TRANSMISSION_MODE_AUTO
+ DVB API Version 5.11, Current v5 delivery system: DVBC/ANNEX_A
+ Supported delivery systems:
+ DVBT
+ DVBT2
+ [DVBC/ANNEX_A]
+ DVBS
+ DVBS2
+ Frequency range for the current standard:
+ From: 51.0 MHz
+ To: 2.15 GHz
+ Step: 62.5 kHz
+ Tolerance: 29.5 MHz
+ Symbol rate ranges for the current standard:
+ From: 1.00 MBauds
+ To: 45.0 MBauds
+
+This should return what is currently set up at the demod struct, i.e.::
+
+ static const struct dvb_frontend_ops vidtv_demod_ops = {
+ .delsys = {
+ SYS_DVBT,
+ SYS_DVBT2,
+ SYS_DVBC_ANNEX_A,
+ SYS_DVBS,
+ SYS_DVBS2,
+ },
+
+ .info = {
+ .name = "Dummy demod for DVB-T/T2/C/S/S2",
+ .frequency_min_hz = 51 * MHz,
+ .frequency_max_hz = 2150 * MHz,
+ .frequency_stepsize_hz = 62500,
+ .frequency_tolerance_hz = 29500 * kHz,
+ .symbol_rate_min = 1000000,
+ .symbol_rate_max = 45000000,
+
+ .caps = FE_CAN_FEC_1_2 |
+ FE_CAN_FEC_2_3 |
+ FE_CAN_FEC_3_4 |
+ FE_CAN_FEC_4_5 |
+ FE_CAN_FEC_5_6 |
+ FE_CAN_FEC_6_7 |
+ FE_CAN_FEC_7_8 |
+ FE_CAN_FEC_8_9 |
+ FE_CAN_QAM_16 |
+ FE_CAN_QAM_64 |
+ FE_CAN_QAM_32 |
+ FE_CAN_QAM_128 |
+ FE_CAN_QAM_256 |
+ FE_CAN_QAM_AUTO |
+ FE_CAN_QPSK |
+ FE_CAN_FEC_AUTO |
+ FE_CAN_INVERSION_AUTO |
+ FE_CAN_TRANSMISSION_MODE_AUTO |
+ FE_CAN_GUARD_INTERVAL_AUTO |
+ FE_CAN_HIERARCHY_AUTO,
+ }
+
+ ....
+
+For more information on dvb-fe-tools check its online documentation here:
+`dvb-fe-tool Documentation
+<https://www.linuxtv.org/wiki/index.php/Dvb-fe-tool>`_.
+
+Using dvb-scan
+~~~~~~~~~~~~~~
+
+In order to tune into a channel and read the PSI tables, we can use dvb-scan.
+
+For this, one should provide a configuration file known as a 'scan file',
+here's an example::
+
+ [Channel]
+ FREQUENCY = 474000000
+ MODULATION = QAM/AUTO
+ SYMBOL_RATE = 6940000
+ INNER_FEC = AUTO
+ DELIVERY_SYSTEM = DVBC/ANNEX_A
+
+.. note::
+ The parameters depend on the video standard you're testing.
+
+.. note::
+ Vidtv is a fake driver and does not validate much of the information
+ in the scan file. Just specifying 'FREQUENCY' and 'DELIVERY_SYSTEM'
+ should be enough for DVB-T/DVB-T2. For DVB-S/DVB-C however, you
+ should also provide 'SYMBOL_RATE'.
+
+You can browse scan tables online here: `dvb-scan-tables
+<https://git.linuxtv.org/dtv-scan-tables.git>`_.
+
+Assuming this channel is named 'channel.conf', you can then run::
+
+ $ dvbv5-scan channel.conf
+ dvbv5-scan ~/vidtv.conf
+ ERROR command BANDWIDTH_HZ (5) not found during retrieve
+ Cannot calc frequency shift. Either bandwidth/symbol-rate is unavailable (yet).
+ Scanning frequency #1 330000000
+ (0x00) Signal= -68.00dBm
+ Scanning frequency #2 474000000
+ Lock (0x1f) Signal= -34.45dBm C/N= 33.74dB UCB= 0
+ Service Beethoven, provider LinuxTV.org: digital television
+
+For more information on dvb-scan, check its documentation online here:
+`dvb-scan Documentation <https://www.linuxtv.org/wiki/index.php/Dvbscan>`_.
+
+Using dvb-zap
+~~~~~~~~~~~~~
+
+dvbv5-zap is a command line tool that can be used to record MPEG-TS to disk. The
+typical use is to tune into a channel and put it into record mode. The example
+below - which is taken from the documentation - illustrates that\ [1]_::
+
+ $ dvbv5-zap -c dvb_channel.conf "beethoven" -o music.ts -P -t 10
+ using demux 'dvb0.demux0'
+ reading channels from file 'dvb_channel.conf'
+ tuning to 474000000 Hz
+ pass all PID's to TS
+ dvb_set_pesfilter 8192
+ dvb_dev_set_bufsize: buffer set to 6160384
+ Lock (0x1f) Quality= Good Signal= -34.66dBm C/N= 33.41dB UCB= 0 postBER= 0 preBER= 1.05x10^-3 PER= 0
+ Lock (0x1f) Quality= Good Signal= -34.57dBm C/N= 33.46dB UCB= 0 postBER= 0 preBER= 1.05x10^-3 PER= 0
+ Record to file 'music.ts' started
+ received 24587768 bytes (2401 Kbytes/sec)
+ Lock (0x1f) Quality= Good Signal= -34.42dBm C/N= 33.89dB UCB= 0 postBER= 0 preBER= 2.44x10^-3 PER= 0
+
+.. [1] In this example, it records 10 seconds with all program ID's stored
+ at the music.ts file.
+
+
+The channel can be watched by playing the contents of the stream with some
+player that recognizes the MPEG-TS format, such as ``mplayer`` or ``vlc``.
+
+By playing the contents of the stream one can visually inspect the workings of
+vidtv, e.g., to play a recorded TS file with::
+
+ $ mplayer music.ts
+
+or, alternatively, running this command on one terminal::
+
+ $ dvbv5-zap -c dvb_channel.conf "beethoven" -P -r &
+
+And, on a second terminal, playing the contents from DVR interface with::
+
+ $ mplayer /dev/dvb/adapter0/dvr0
+
+For more information on dvb-zap check its online documentation here:
+`dvb-zap Documentation
+<https://www.linuxtv.org/wiki/index.php/Dvbv5-zap>`_.
+See also: `zap <https://www.linuxtv.org/wiki/index.php/Zap>`_.
+
+
+What can still be improved in vidtv
+-----------------------------------
+
+Add *debugfs* integration
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Although frontend drivers provide DVBv5 statistics via the .read_status
+call, a nice addition would be to make additional statistics available to
+userspace via debugfs, which is a simple-to-use, RAM-based filesystem
+specifically designed for debug purposes.
+
+The logic for this would be implemented on a separate file so as not to
+pollute the frontend driver. These statistics are driver-specific and can
+be useful during tests.
+
+The Siano driver is one example of a driver using
+debugfs to convey driver-specific statistics to userspace and it can be
+used as a reference.
+
+This should be further enabled and disabled via a Kconfig
+option for convenience.
+
+Add a way to test video
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Currently, vidtv can only encode PCM audio. It would be great to implement
+a barebones version of MPEG-2 video encoding so we can also test video. The
+first place to look into is *ISO 13818-2: Information technology — Generic
+coding of moving pictures and associated audio information — Part 2: Video*,
+which covers the encoding of compressed video in MPEG Transport Streams.
+
+This might optionally use the Video4Linux2 Test Pattern Generator, v4l2-tpg,
+which resides at::
+
+ drivers/media/common/v4l2-tpg/
+
+
+Add white noise simulation
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The vidtv tuner already has code to identify whether the chosen frequency
+is too far away from a table of valid frequencies. For now, this means that
+the demodulator can eventually lose the lock on the signal, since the tuner will
+report a bad signal quality.
+
+A nice addition is to simulate some noise when the signal quality is bad by:
+
+- Randomly dropping some TS packets. This will trigger a continuity error if the
+ continuity counter is updated but the packet is not passed on to the demux.
+
+- Updating the error statistics accordingly (e.g. BER, etc).
+
+- Simulating some noise in the encoded data.
+
+Functions and structs used within vidtv
+---------------------------------------
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_bridge.h
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_channel.h
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_demod.h
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_encoder.h
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_mux.h
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_pes.h
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_psi.h
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_s302m.h
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_ts.h
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_tuner.h
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_common.c
+
+.. kernel-doc:: drivers/media/test-drivers/vidtv/vidtv_tuner.c
diff --git a/Documentation/driver-api/media/drivers/vimc-devel.rst b/Documentation/driver-api/media/drivers/vimc-devel.rst
new file mode 100644
index 0000000000..9e984f914b
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/vimc-devel.rst
@@ -0,0 +1,15 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+The Virtual Media Controller Driver (vimc)
+==========================================
+
+Source code documentation
+-------------------------
+
+vimc-streamer
+~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/media/test-drivers/vimc/vimc-streamer.h
+ :internal:
+
+.. kernel-doc:: drivers/media/test-drivers/vimc/vimc-streamer.c
diff --git a/Documentation/driver-api/media/drivers/zoran.rst b/Documentation/driver-api/media/drivers/zoran.rst
new file mode 100644
index 0000000000..b205e10c31
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/zoran.rst
@@ -0,0 +1,575 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+The Zoran driver
+================
+
+unified zoran driver (zr360x7, zoran, buz, dc10(+), dc30(+), lml33)
+
+website: http://mjpeg.sourceforge.net/driver-zoran/
+
+
+Frequently Asked Questions
+--------------------------
+
+What cards are supported
+------------------------
+
+Iomega Buz, Linux Media Labs LML33/LML33R10, Pinnacle/Miro
+DC10/DC10+/DC30/DC30+ and related boards (available under various names).
+
+Iomega Buz
+~~~~~~~~~~
+
+* Zoran zr36067 PCI controller
+* Zoran zr36060 MJPEG codec
+* Philips saa7111 TV decoder
+* Philips saa7185 TV encoder
+
+Drivers to use: videodev, i2c-core, i2c-algo-bit,
+videocodec, saa7111, saa7185, zr36060, zr36067
+
+Inputs/outputs: Composite and S-video
+
+Norms: PAL, SECAM (720x576 @ 25 fps), NTSC (720x480 @ 29.97 fps)
+
+Card number: 7
+
+AverMedia 6 Eyes AVS6EYES
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+* Zoran zr36067 PCI controller
+* Zoran zr36060 MJPEG codec
+* Samsung ks0127 TV decoder
+* Conexant bt866 TV encoder
+
+Drivers to use: videodev, i2c-core, i2c-algo-bit,
+videocodec, ks0127, bt866, zr36060, zr36067
+
+Inputs/outputs:
+ Six physical inputs. 1-6 are composite,
+ 1-2, 3-4, 5-6 doubles as S-video,
+ 1-3 triples as component.
+ One composite output.
+
+Norms: PAL, SECAM (720x576 @ 25 fps), NTSC (720x480 @ 29.97 fps)
+
+Card number: 8
+
+.. note::
+
+ Not autodetected, card=8 is necessary.
+
+Linux Media Labs LML33
+~~~~~~~~~~~~~~~~~~~~~~
+
+* Zoran zr36067 PCI controller
+* Zoran zr36060 MJPEG codec
+* Brooktree bt819 TV decoder
+* Brooktree bt856 TV encoder
+
+Drivers to use: videodev, i2c-core, i2c-algo-bit,
+videocodec, bt819, bt856, zr36060, zr36067
+
+Inputs/outputs: Composite and S-video
+
+Norms: PAL (720x576 @ 25 fps), NTSC (720x480 @ 29.97 fps)
+
+Card number: 5
+
+Linux Media Labs LML33R10
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+* Zoran zr36067 PCI controller
+* Zoran zr36060 MJPEG codec
+* Philips saa7114 TV decoder
+* Analog Devices adv7170 TV encoder
+
+Drivers to use: videodev, i2c-core, i2c-algo-bit,
+videocodec, saa7114, adv7170, zr36060, zr36067
+
+Inputs/outputs: Composite and S-video
+
+Norms: PAL (720x576 @ 25 fps), NTSC (720x480 @ 29.97 fps)
+
+Card number: 6
+
+Pinnacle/Miro DC10(new)
+~~~~~~~~~~~~~~~~~~~~~~~
+
+* Zoran zr36057 PCI controller
+* Zoran zr36060 MJPEG codec
+* Philips saa7110a TV decoder
+* Analog Devices adv7176 TV encoder
+
+Drivers to use: videodev, i2c-core, i2c-algo-bit,
+videocodec, saa7110, adv7175, zr36060, zr36067
+
+Inputs/outputs: Composite, S-video and Internal
+
+Norms: PAL, SECAM (768x576 @ 25 fps), NTSC (640x480 @ 29.97 fps)
+
+Card number: 1
+
+Pinnacle/Miro DC10+
+~~~~~~~~~~~~~~~~~~~
+
+* Zoran zr36067 PCI controller
+* Zoran zr36060 MJPEG codec
+* Philips saa7110a TV decoder
+* Analog Devices adv7176 TV encoder
+
+Drivers to use: videodev, i2c-core, i2c-algo-bit,
+videocodec, saa7110, adv7175, zr36060, zr36067
+
+Inputs/outputs: Composite, S-video and Internal
+
+Norms: PAL, SECAM (768x576 @ 25 fps), NTSC (640x480 @ 29.97 fps)
+
+Card number: 2
+
+Pinnacle/Miro DC10(old)
+~~~~~~~~~~~~~~~~~~~~~~~
+
+* Zoran zr36057 PCI controller
+* Zoran zr36050 MJPEG codec
+* Zoran zr36016 Video Front End or Fuji md0211 Video Front End (clone?)
+* Micronas vpx3220a TV decoder
+* mse3000 TV encoder or Analog Devices adv7176 TV encoder
+
+Drivers to use: videodev, i2c-core, i2c-algo-bit,
+videocodec, vpx3220, mse3000/adv7175, zr36050, zr36016, zr36067
+
+Inputs/outputs: Composite, S-video and Internal
+
+Norms: PAL, SECAM (768x576 @ 25 fps), NTSC (640x480 @ 29.97 fps)
+
+Card number: 0
+
+Pinnacle/Miro DC30
+~~~~~~~~~~~~~~~~~~
+
+* Zoran zr36057 PCI controller
+* Zoran zr36050 MJPEG codec
+* Zoran zr36016 Video Front End
+* Micronas vpx3225d/vpx3220a/vpx3216b TV decoder
+* Analog Devices adv7176 TV encoder
+
+Drivers to use: videodev, i2c-core, i2c-algo-bit,
+videocodec, vpx3220/vpx3224, adv7175, zr36050, zr36016, zr36067
+
+Inputs/outputs: Composite, S-video and Internal
+
+Norms: PAL, SECAM (768x576 @ 25 fps), NTSC (640x480 @ 29.97 fps)
+
+Card number: 3
+
+Pinnacle/Miro DC30+
+~~~~~~~~~~~~~~~~~~~
+
+* Zoran zr36067 PCI controller
+* Zoran zr36050 MJPEG codec
+* Zoran zr36016 Video Front End
+* Micronas vpx3225d/vpx3220a/vpx3216b TV decoder
+* Analog Devices adv7176 TV encoder
+
+Drivers to use: videodev, i2c-core, i2c-algo-bit,
+videocodec, vpx3220/vpx3224, adv7175, zr36050, zr36015, zr36067
+
+Inputs/outputs: Composite, S-video and Internal
+
+Norms: PAL, SECAM (768x576 @ 25 fps), NTSC (640x480 @ 29.97 fps)
+
+Card number: 4
+
+.. note::
+
+ #) No module for the mse3000 is available yet
+ #) No module for the vpx3224 is available yet
+
+1.1 What the TV decoder can do an what not
+------------------------------------------
+
+The best know TV standards are NTSC/PAL/SECAM. but for decoding a frame that
+information is not enough. There are several formats of the TV standards.
+And not every TV decoder is able to handle every format. Also the every
+combination is supported by the driver. There are currently 11 different
+tv broadcast formats all aver the world.
+
+The CCIR defines parameters needed for broadcasting the signal.
+The CCIR has defined different standards: A,B,D,E,F,G,D,H,I,K,K1,L,M,N,...
+The CCIR says not much about the colorsystem used !!!
+And talking about a colorsystem says not to much about how it is broadcast.
+
+The CCIR standards A,E,F are not used any more.
+
+When you speak about NTSC, you usually mean the standard: CCIR - M using
+the NTSC colorsystem which is used in the USA, Japan, Mexico, Canada
+and a few others.
+
+When you talk about PAL, you usually mean: CCIR - B/G using the PAL
+colorsystem which is used in many Countries.
+
+When you talk about SECAM, you mean: CCIR - L using the SECAM Colorsystem
+which is used in France, and a few others.
+
+There the other version of SECAM, CCIR - D/K is used in Bulgaria, China,
+Slovakai, Hungary, Korea (Rep.), Poland, Rumania and a others.
+
+The CCIR - H uses the PAL colorsystem (sometimes SECAM) and is used in
+Egypt, Libya, Sri Lanka, Syrain Arab. Rep.
+
+The CCIR - I uses the PAL colorsystem, and is used in Great Britain, Hong Kong,
+Ireland, Nigeria, South Africa.
+
+The CCIR - N uses the PAL colorsystem and PAL frame size but the NTSC framerate,
+and is used in Argentinia, Uruguay, an a few others
+
+We do not talk about how the audio is broadcast !
+
+A rather good sites about the TV standards are:
+http://www.sony.jp/support/
+http://info.electronicwerkstatt.de/bereiche/fernsehtechnik/frequenzen_und_normen/Fernsehnormen/
+and http://www.cabl.com/restaurant/channel.html
+
+Other weird things around: NTSC 4.43 is a modificated NTSC, which is mainly
+used in PAL VCR's that are able to play back NTSC. PAL 60 seems to be the same
+as NTSC 4.43 . The Datasheets also talk about NTSC 44, It seems as if it would
+be the same as NTSC 4.43.
+NTSC Combs seems to be a decoder mode where the decoder uses a comb filter
+to split coma and luma instead of a Delay line.
+
+But I did not defiantly find out what NTSC Comb is.
+
+Philips saa7111 TV decoder
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- was introduced in 1997, is used in the BUZ and
+- can handle: PAL B/G/H/I, PAL N, PAL M, NTSC M, NTSC N, NTSC 4.43 and SECAM
+
+Philips saa7110a TV decoder
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- was introduced in 1995, is used in the Pinnacle/Miro DC10(new), DC10+ and
+- can handle: PAL B/G, NTSC M and SECAM
+
+Philips saa7114 TV decoder
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- was introduced in 2000, is used in the LML33R10 and
+- can handle: PAL B/G/D/H/I/N, PAL N, PAL M, NTSC M, NTSC 4.43 and SECAM
+
+Brooktree bt819 TV decoder
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- was introduced in 1996, and is used in the LML33 and
+- can handle: PAL B/D/G/H/I, NTSC M
+
+Micronas vpx3220a TV decoder
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- was introduced in 1996, is used in the DC30 and DC30+ and
+- can handle: PAL B/G/H/I, PAL N, PAL M, NTSC M, NTSC 44, PAL 60, SECAM,NTSC Comb
+
+Samsung ks0127 TV decoder
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- is used in the AVS6EYES card and
+- can handle: NTSC-M/N/44, PAL-M/N/B/G/H/I/D/K/L and SECAM
+
+
+What the TV encoder can do an what not
+--------------------------------------
+
+The TV encoder is doing the "same" as the decoder, but in the other direction.
+You feed them digital data and the generate a Composite or SVHS signal.
+For information about the colorsystems and TV norm take a look in the
+TV decoder section.
+
+Philips saa7185 TV Encoder
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- was introduced in 1996, is used in the BUZ
+- can generate: PAL B/G, NTSC M
+
+Brooktree bt856 TV Encoder
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- was introduced in 1994, is used in the LML33
+- can generate: PAL B/D/G/H/I/N, PAL M, NTSC M, PAL-N (Argentina)
+
+Analog Devices adv7170 TV Encoder
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- was introduced in 2000, is used in the LML300R10
+- can generate: PAL B/D/G/H/I/N, PAL M, NTSC M, PAL 60
+
+Analog Devices adv7175 TV Encoder
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- was introduced in 1996, is used in the DC10, DC10+, DC10 old, DC30, DC30+
+- can generate: PAL B/D/G/H/I/N, PAL M, NTSC M
+
+ITT mse3000 TV encoder
+~~~~~~~~~~~~~~~~~~~~~~
+
+- was introduced in 1991, is used in the DC10 old
+- can generate: PAL , NTSC , SECAM
+
+Conexant bt866 TV encoder
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- is used in AVS6EYES, and
+- can generate: NTSC/PAL, PAL-M, PAL-N
+
+The adv717x, should be able to produce PAL N. But you find nothing PAL N
+specific in the registers. Seem that you have to reuse a other standard
+to generate PAL N, maybe it would work if you use the PAL M settings.
+
+How do I get this damn thing to work
+------------------------------------
+
+Load zr36067.o. If it can't autodetect your card, use the card=X insmod
+option with X being the card number as given in the previous section.
+To have more than one card, use card=X1[,X2[,X3,[X4[..]]]]
+
+To automate this, add the following to your /etc/modprobe.d/zoran.conf:
+
+options zr36067 card=X1[,X2[,X3[,X4[..]]]]
+alias char-major-81-0 zr36067
+
+One thing to keep in mind is that this doesn't load zr36067.o itself yet. It
+just automates loading. If you start using xawtv, the device won't load on
+some systems, since you're trying to load modules as a user, which is not
+allowed ("permission denied"). A quick workaround is to add 'Load "v4l"' to
+XF86Config-4 when you use X by default, or to run 'v4l-conf -c <device>' in
+one of your startup scripts (normally rc.local) if you don't use X. Both
+make sure that the modules are loaded on startup, under the root account.
+
+What mainboard should I use (or why doesn't my card work)
+---------------------------------------------------------
+
+
+<insert lousy disclaimer here>. In short: good=SiS/Intel, bad=VIA.
+
+Experience tells us that people with a Buz, on average, have more problems
+than users with a DC10+/LML33. Also, it tells us that people owning a VIA-
+based mainboard (ktXXX, MVP3) have more problems than users with a mainboard
+based on a different chipset. Here's some notes from Andrew Stevens:
+
+Here's my experience of using LML33 and Buz on various motherboards:
+
+- VIA MVP3
+ - Forget it. Pointless. Doesn't work.
+- Intel 430FX (Pentium 200)
+ - LML33 perfect, Buz tolerable (3 or 4 frames dropped per movie)
+- Intel 440BX (early stepping)
+ - LML33 tolerable. Buz starting to get annoying (6-10 frames/hour)
+- Intel 440BX (late stepping)
+ - Buz tolerable, LML3 almost perfect (occasional single frame drops)
+- SiS735
+ - LML33 perfect, Buz tolerable.
+- VIA KT133(*)
+ - LML33 starting to get annoying, Buz poor enough that I have up.
+
+- Both 440BX boards were dual CPU versions.
+
+Bernhard Praschinger later added:
+
+- AMD 751
+ - Buz perfect-tolerable
+- AMD 760
+ - Buz perfect-tolerable
+
+In general, people on the user mailinglist won't give you much of a chance
+if you have a VIA-based motherboard. They may be cheap, but sometimes, you'd
+rather want to spend some more money on better boards. In general, VIA
+mainboard's IDE/PCI performance will also suck badly compared to others.
+You'll noticed the DC10+/DC30+ aren't mentioned anywhere in the overview.
+Basically, you can assume that if the Buz works, the LML33 will work too. If
+the LML33 works, the DC10+/DC30+ will work too. They're most tolerant to
+different mainboard chipsets from all of the supported cards.
+
+If you experience timeouts during capture, buy a better mainboard or lower
+the quality/buffersize during capture (see 'Concerning buffer sizes, quality,
+output size etc.'). If it hangs, there's little we can do as of now. Check
+your IRQs and make sure the card has its own interrupts.
+
+Programming interface
+---------------------
+
+This driver conforms to video4linux2. Support for V4L1 and for the custom
+zoran ioctls has been removed in kernel 2.6.38.
+
+For programming example, please, look at lavrec.c and lavplay.c code in
+the MJPEG-tools (http://mjpeg.sf.net/).
+
+Additional notes for software developers:
+
+ The driver returns maxwidth and maxheight parameters according to
+ the current TV standard (norm). Therefore, the software which
+ communicates with the driver and "asks" for these parameters should
+ first set the correct norm. Well, it seems logically correct: TV
+ standard is "more constant" for current country than geometry
+ settings of a variety of TV capture cards which may work in ITU or
+ square pixel format.
+
+Applications
+------------
+
+Applications known to work with this driver:
+
+TV viewing:
+
+* xawtv
+* kwintv
+* probably any TV application that supports video4linux or video4linux2.
+
+MJPEG capture/playback:
+
+* mjpegtools/lavtools (or Linux Video Studio)
+* gstreamer
+* mplayer
+
+General raw capture:
+
+* xawtv
+* gstreamer
+* probably any application that supports video4linux or video4linux2
+
+Video editing:
+
+* Cinelerra
+* MainActor
+* mjpegtools (or Linux Video Studio)
+
+
+Concerning buffer sizes, quality, output size etc.
+--------------------------------------------------
+
+
+The zr36060 can do 1:2 JPEG compression. This is really the theoretical
+maximum that the chipset can reach. The driver can, however, limit compression
+to a maximum (size) of 1:4. The reason for this is that some cards (e.g. Buz)
+can't handle 1:2 compression without stopping capture after only a few minutes.
+With 1:4, it'll mostly work. If you have a Buz, use 'low_bitrate=1' to go into
+1:4 max. compression mode.
+
+100% JPEG quality is thus 1:2 compression in practice. So for a full PAL frame
+(size 720x576). The JPEG fields are stored in YUY2 format, so the size of the
+fields are 720x288x16/2 bits/field (2 fields/frame) = 207360 bytes/field x 2 =
+414720 bytes/frame (add some more bytes for headers and DHT (huffman)/DQT
+(quantization) tables, and you'll get to something like 512kB per frame for
+1:2 compression. For 1:4 compression, you'd have frames of half this size.
+
+Some additional explanation by Martin Samuelsson, which also explains the
+importance of buffer sizes:
+--
+> Hmm, I do not think it is really that way. With the current (downloaded
+> at 18:00 Monday) driver I get that output sizes for 10 sec:
+> -q 50 -b 128 : 24.283.332 Bytes
+> -q 50 -b 256 : 48.442.368
+> -q 25 -b 128 : 24.655.992
+> -q 25 -b 256 : 25.859.820
+
+I woke up, and can't go to sleep again. I'll kill some time explaining why
+this doesn't look strange to me.
+
+Let's do some math using a width of 704 pixels. I'm not sure whether the Buz
+actually use that number or not, but that's not too important right now.
+
+704x288 pixels, one field, is 202752 pixels. Divided by 64 pixels per block;
+3168 blocks per field. Each pixel consist of two bytes; 128 bytes per block;
+1024 bits per block. 100% in the new driver mean 1:2 compression; the maximum
+output becomes 512 bits per block. Actually 510, but 512 is simpler to use
+for calculations.
+
+Let's say that we specify d1q50. We thus want 256 bits per block; times 3168
+becomes 811008 bits; 101376 bytes per field. We're talking raw bits and bytes
+here, so we don't need to do any fancy corrections for bits-per-pixel or such
+things. 101376 bytes per field.
+
+d1 video contains two fields per frame. Those sum up to 202752 bytes per
+frame, and one of those frames goes into each buffer.
+
+But wait a second! -b128 gives 128kB buffers! It's not possible to cram
+202752 bytes of JPEG data into 128kB!
+
+This is what the driver notice and automatically compensate for in your
+examples. Let's do some math using this information:
+
+128kB is 131072 bytes. In this buffer, we want to store two fields, which
+leaves 65536 bytes for each field. Using 3168 blocks per field, we get
+20.68686868... available bytes per block; 165 bits. We can't allow the
+request for 256 bits per block when there's only 165 bits available! The -q50
+option is silently overridden, and the -b128 option takes precedence, leaving
+us with the equivalence of -q32.
+
+This gives us a data rate of 165 bits per block, which, times 3168, sums up
+to 65340 bytes per field, out of the allowed 65536. The current driver has
+another level of rate limiting; it won't accept -q values that fill more than
+6/8 of the specified buffers. (I'm not sure why. "Playing it safe" seem to be
+a safe bet. Personally, I think I would have lowered requested-bits-per-block
+by one, or something like that.) We can't use 165 bits per block, but have to
+lower it again, to 6/8 of the available buffer space: We end up with 124 bits
+per block, the equivalence of -q24. With 128kB buffers, you can't use greater
+than -q24 at -d1. (And PAL, and 704 pixels width...)
+
+The third example is limited to -q24 through the same process. The second
+example, using very similar calculations, is limited to -q48. The only
+example that actually grab at the specified -q value is the last one, which
+is clearly visible, looking at the file size.
+--
+
+Conclusion: the quality of the resulting movie depends on buffer size, quality,
+whether or not you use 'low_bitrate=1' as insmod option for the zr36060.c
+module to do 1:4 instead of 1:2 compression, etc.
+
+If you experience timeouts, lowering the quality/buffersize or using
+'low_bitrate=1 as insmod option for zr36060.o might actually help, as is
+proven by the Buz.
+
+It hangs/crashes/fails/whatevers! Help!
+---------------------------------------
+
+Make sure that the card has its own interrupts (see /proc/interrupts), check
+the output of dmesg at high verbosity (load zr36067.o with debug=2,
+load all other modules with debug=1). Check that your mainboard is favorable
+(see question 2) and if not, test the card in another computer. Also see the
+notes given in question 3 and try lowering quality/buffersize/capturesize
+if recording fails after a period of time.
+
+If all this doesn't help, give a clear description of the problem including
+detailed hardware information (memory+brand, mainboard+chipset+brand, which
+MJPEG card, processor, other PCI cards that might be of interest), give the
+system PnP information (/proc/interrupts, /proc/dma, /proc/devices), and give
+the kernel version, driver version, glibc version, gcc version and any other
+information that might possibly be of interest. Also provide the dmesg output
+at high verbosity. See 'Contacting' on how to contact the developers.
+
+Maintainers/Contacting
+----------------------
+
+Previous maintainers/developers of this driver are
+- Laurent Pinchart <laurent.pinchart@skynet.be>
+- Ronald Bultje rbultje@ronald.bitfreak.net
+- Serguei Miridonov <mirsev@cicese.mx>
+- Wolfgang Scherr <scherr@net4you.net>
+- Dave Perks <dperks@ibm.net>
+- Rainer Johanni <Rainer@Johanni.de>
+
+Driver's License
+----------------
+
+ This driver is distributed under the terms of the General Public License.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+See http://www.gnu.org/ for more information.
diff --git a/Documentation/driver-api/media/dtv-ca.rst b/Documentation/driver-api/media/dtv-ca.rst
new file mode 100644
index 0000000000..8a09862b42
--- /dev/null
+++ b/Documentation/driver-api/media/dtv-ca.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Digital TV Conditional Access kABI
+----------------------------------
+
+.. kernel-doc:: include/media/dvb_ca_en50221.h
diff --git a/Documentation/driver-api/media/dtv-common.rst b/Documentation/driver-api/media/dtv-common.rst
new file mode 100644
index 0000000000..207a22bcaf
--- /dev/null
+++ b/Documentation/driver-api/media/dtv-common.rst
@@ -0,0 +1,53 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Digital TV Common functions
+---------------------------
+
+DVB devices
+~~~~~~~~~~~
+
+Those functions are responsible for handling the DVB device nodes.
+
+.. kernel-doc:: include/media/dvbdev.h
+
+Digital TV Ring buffer
+~~~~~~~~~~~~~~~~~~~~~~
+
+Those routines implement ring buffers used to handle digital TV data and
+copy it from/to userspace.
+
+.. note::
+
+ 1) For performance reasons read and write routines don't check buffer sizes
+ and/or number of bytes free/available. This has to be done before these
+ routines are called. For example:
+
+ .. code-block:: c
+
+ /* write @buflen: bytes */
+ free = dvb_ringbuffer_free(rbuf);
+ if (free >= buflen)
+ count = dvb_ringbuffer_write(rbuf, buffer, buflen);
+ else
+ /* do something */
+
+ /* read min. 1000, max. @bufsize: bytes */
+ avail = dvb_ringbuffer_avail(rbuf);
+ if (avail >= 1000)
+ count = dvb_ringbuffer_read(rbuf, buffer, min(avail, bufsize));
+ else
+ /* do something */
+
+ 2) If there is exactly one reader and one writer, there is no need
+ to lock read or write operations.
+ Two or more readers must be locked against each other.
+ Flushing the buffer counts as a read operation.
+ Resetting the buffer counts as a read and write operation.
+ Two or more writers must be locked against each other.
+
+.. kernel-doc:: include/media/dvb_ringbuffer.h
+
+Digital TV VB2 handler
+~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/media/dvb_vb2.h
diff --git a/Documentation/driver-api/media/dtv-core.rst b/Documentation/driver-api/media/dtv-core.rst
new file mode 100644
index 0000000000..82c5b85ed9
--- /dev/null
+++ b/Documentation/driver-api/media/dtv-core.rst
@@ -0,0 +1,39 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Digital TV (DVB) devices
+------------------------
+
+Digital TV devices are implemented by several different drivers:
+
+- A bridge driver that is responsible to talk with the bus where the other
+ devices are connected (PCI, USB, SPI), bind to the other drivers and
+ implement the digital demux logic (either in software or in hardware);
+
+- Frontend drivers that are usually implemented as two separate drivers:
+
+ - A tuner driver that implements the logic which commands the part of
+ the hardware responsible for tuning into a digital TV transponder or
+ physical channel. The output of a tuner is usually a baseband or
+ Intermediate Frequency (IF) signal;
+
+ - A demodulator driver (a.k.a "demod") that implements the logic which
+ commands the digital TV decoding hardware. The output of a demod is
+ a digital stream, with multiple audio, video and data channels typically
+ multiplexed using MPEG Transport Stream [#f1]_.
+
+On most hardware, the frontend drivers talk with the bridge driver using an
+I2C bus.
+
+.. [#f1] Some standards use TCP/IP for multiplexing data, like DVB-H (an
+ abandoned standard, not used anymore) and ATSC version 3.0 current
+ proposals. Currently, the DVB subsystem doesn't implement those standards.
+
+
+.. toctree::
+ :maxdepth: 1
+
+ dtv-common
+ dtv-frontend
+ dtv-demux
+ dtv-ca
+ dtv-net
diff --git a/Documentation/driver-api/media/dtv-demux.rst b/Documentation/driver-api/media/dtv-demux.rst
new file mode 100644
index 0000000000..1441241426
--- /dev/null
+++ b/Documentation/driver-api/media/dtv-demux.rst
@@ -0,0 +1,84 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Digital TV Demux kABI
+---------------------
+
+Digital TV Demux
+~~~~~~~~~~~~~~~~
+
+The Kernel Digital TV Demux kABI defines a driver-internal interface for
+registering low-level, hardware specific driver to a hardware independent
+demux layer. It is only of interest for Digital TV device driver writers.
+The header file for this kABI is named ``demux.h`` and located in
+``include/media``.
+
+The demux kABI should be implemented for each demux in the system. It is
+used to select the TS source of a demux and to manage the demux resources.
+When the demux client allocates a resource via the demux kABI, it receives
+a pointer to the kABI of that resource.
+
+Each demux receives its TS input from a DVB front-end or from memory, as
+set via this demux kABI. In a system with more than one front-end, the kABI
+can be used to select one of the DVB front-ends as a TS source for a demux,
+unless this is fixed in the HW platform.
+
+The demux kABI only controls front-ends regarding to their connections with
+demuxes; the kABI used to set the other front-end parameters, such as
+tuning, are defined via the Digital TV Frontend kABI.
+
+The functions that implement the abstract interface demux should be defined
+static or module private and registered to the Demux core for external
+access. It is not necessary to implement every function in the struct
+:c:type:`dmx_demux`. For example, a demux interface might support Section filtering,
+but not PES filtering. The kABI client is expected to check the value of any
+function pointer before calling the function: the value of ``NULL`` means
+that the function is not available.
+
+Whenever the functions of the demux API modify shared data, the
+possibilities of lost update and race condition problems should be
+addressed, e.g. by protecting parts of code with mutexes.
+
+Note that functions called from a bottom half context must not sleep.
+Even a simple memory allocation without using ``GFP_ATOMIC`` can result in a
+kernel thread being put to sleep if swapping is needed. For example, the
+Linux Kernel calls the functions of a network device interface from a
+bottom half context. Thus, if a demux kABI function is called from network
+device code, the function must not sleep.
+
+Demux Callback API
+~~~~~~~~~~~~~~~~~~
+
+This kernel-space API comprises the callback functions that deliver filtered
+data to the demux client. Unlike the other DVB kABIs, these functions are
+provided by the client and called from the demux code.
+
+The function pointers of this abstract interface are not packed into a
+structure as in the other demux APIs, because the callback functions are
+registered and used independent of each other. As an example, it is possible
+for the API client to provide several callback functions for receiving TS
+packets and no callbacks for PES packets or sections.
+
+The functions that implement the callback API need not be re-entrant: when
+a demux driver calls one of these functions, the driver is not allowed to
+call the function again before the original call returns. If a callback is
+triggered by a hardware interrupt, it is recommended to use the Linux
+bottom half mechanism or start a tasklet instead of making the callback
+function call directly from a hardware interrupt.
+
+This mechanism is implemented by :c:func:`dmx_ts_cb()` and :c:func:`dmx_section_cb()`
+callbacks.
+
+Digital TV Demux device registration functions and data structures
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/media/dmxdev.h
+
+High-level Digital TV demux interface
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/media/dvb_demux.h
+
+Driver-internal low-level hardware specific driver demux interface
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/media/demux.h
diff --git a/Documentation/driver-api/media/dtv-frontend.rst b/Documentation/driver-api/media/dtv-frontend.rst
new file mode 100644
index 0000000000..ea43cdb5b0
--- /dev/null
+++ b/Documentation/driver-api/media/dtv-frontend.rst
@@ -0,0 +1,445 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Digital TV Frontend kABI
+------------------------
+
+Digital TV Frontend
+~~~~~~~~~~~~~~~~~~~
+
+The Digital TV Frontend kABI defines a driver-internal interface for
+registering low-level, hardware specific driver to a hardware independent
+frontend layer. It is only of interest for Digital TV device driver writers.
+The header file for this API is named ``dvb_frontend.h`` and located in
+``include/media/``.
+
+Demodulator driver
+^^^^^^^^^^^^^^^^^^
+
+The demodulator driver is responsible for talking with the decoding part of the
+hardware. Such driver should implement :c:type:`dvb_frontend_ops`, which
+tells what type of digital TV standards are supported, and points to a
+series of functions that allow the DVB core to command the hardware via
+the code under ``include/media/dvb_frontend.c``.
+
+A typical example of such struct in a driver ``foo`` is::
+
+ static struct dvb_frontend_ops foo_ops = {
+ .delsys = { SYS_DVBT, SYS_DVBT2, SYS_DVBC_ANNEX_A },
+ .info = {
+ .name = "foo DVB-T/T2/C driver",
+ .caps = FE_CAN_FEC_1_2 |
+ FE_CAN_FEC_2_3 |
+ FE_CAN_FEC_3_4 |
+ FE_CAN_FEC_5_6 |
+ FE_CAN_FEC_7_8 |
+ FE_CAN_FEC_AUTO |
+ FE_CAN_QPSK |
+ FE_CAN_QAM_16 |
+ FE_CAN_QAM_32 |
+ FE_CAN_QAM_64 |
+ FE_CAN_QAM_128 |
+ FE_CAN_QAM_256 |
+ FE_CAN_QAM_AUTO |
+ FE_CAN_TRANSMISSION_MODE_AUTO |
+ FE_CAN_GUARD_INTERVAL_AUTO |
+ FE_CAN_HIERARCHY_AUTO |
+ FE_CAN_MUTE_TS |
+ FE_CAN_2G_MODULATION,
+ .frequency_min = 42000000, /* Hz */
+ .frequency_max = 1002000000, /* Hz */
+ .symbol_rate_min = 870000,
+ .symbol_rate_max = 11700000
+ },
+ .init = foo_init,
+ .sleep = foo_sleep,
+ .release = foo_release,
+ .set_frontend = foo_set_frontend,
+ .get_frontend = foo_get_frontend,
+ .read_status = foo_get_status_and_stats,
+ .tune = foo_tune,
+ .i2c_gate_ctrl = foo_i2c_gate_ctrl,
+ .get_frontend_algo = foo_get_algo,
+ };
+
+A typical example of such struct in a driver ``bar`` meant to be used on
+Satellite TV reception is::
+
+ static const struct dvb_frontend_ops bar_ops = {
+ .delsys = { SYS_DVBS, SYS_DVBS2 },
+ .info = {
+ .name = "Bar DVB-S/S2 demodulator",
+ .frequency_min = 500000, /* KHz */
+ .frequency_max = 2500000, /* KHz */
+ .frequency_stepsize = 0,
+ .symbol_rate_min = 1000000,
+ .symbol_rate_max = 45000000,
+ .symbol_rate_tolerance = 500,
+ .caps = FE_CAN_INVERSION_AUTO |
+ FE_CAN_FEC_AUTO |
+ FE_CAN_QPSK,
+ },
+ .init = bar_init,
+ .sleep = bar_sleep,
+ .release = bar_release,
+ .set_frontend = bar_set_frontend,
+ .get_frontend = bar_get_frontend,
+ .read_status = bar_get_status_and_stats,
+ .i2c_gate_ctrl = bar_i2c_gate_ctrl,
+ .get_frontend_algo = bar_get_algo,
+ .tune = bar_tune,
+
+ /* Satellite-specific */
+ .diseqc_send_master_cmd = bar_send_diseqc_msg,
+ .diseqc_send_burst = bar_send_burst,
+ .set_tone = bar_set_tone,
+ .set_voltage = bar_set_voltage,
+ };
+
+.. note::
+
+ #) For satellite digital TV standards (DVB-S, DVB-S2, ISDB-S), the
+ frequencies are specified in kHz, while, for terrestrial and cable
+ standards, they're specified in Hz. Due to that, if the same frontend
+ supports both types, you'll need to have two separate
+ :c:type:`dvb_frontend_ops` structures, one for each standard.
+ #) The ``.i2c_gate_ctrl`` field is present only when the hardware has
+ allows controlling an I2C gate (either directly of via some GPIO pin),
+ in order to remove the tuner from the I2C bus after a channel is
+ tuned.
+ #) All new drivers should implement the
+ :ref:`DVBv5 statistics <dvbv5_stats>` via ``.read_status``.
+ Yet, there are a number of callbacks meant to get statistics for
+ signal strength, S/N and UCB. Those are there to provide backward
+ compatibility with legacy applications that don't support the DVBv5
+ API. Implementing those callbacks are optional. Those callbacks may be
+ removed in the future, after we have all existing drivers supporting
+ DVBv5 stats.
+ #) Other callbacks are required for satellite TV standards, in order to
+ control LNBf and DiSEqC: ``.diseqc_send_master_cmd``,
+ ``.diseqc_send_burst``, ``.set_tone``, ``.set_voltage``.
+
+.. |delta| unicode:: U+00394
+
+The ``include/media/dvb_frontend.c`` has a kernel thread which is
+responsible for tuning the device. It supports multiple algorithms to
+detect a channel, as defined at enum :c:func:`dvbfe_algo`.
+
+The algorithm to be used is obtained via ``.get_frontend_algo``. If the driver
+doesn't fill its field at struct dvb_frontend_ops, it will default to
+``DVBFE_ALGO_SW``, meaning that the dvb-core will do a zigzag when tuning,
+e. g. it will try first to use the specified center frequency ``f``,
+then, it will do ``f`` + |delta|, ``f`` - |delta|, ``f`` + 2 x |delta|,
+``f`` - 2 x |delta| and so on.
+
+If the hardware has internally a some sort of zigzag algorithm, you should
+define a ``.get_frontend_algo`` function that would return ``DVBFE_ALGO_HW``.
+
+.. note::
+
+ The core frontend support also supports
+ a third type (``DVBFE_ALGO_CUSTOM``), in order to allow the driver to
+ define its own hardware-assisted algorithm. Very few hardware need to
+ use it nowadays. Using ``DVBFE_ALGO_CUSTOM`` require to provide other
+ function callbacks at struct dvb_frontend_ops.
+
+Attaching frontend driver to the bridge driver
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Before using the Digital TV frontend core, the bridge driver should attach
+the frontend demod, tuner and SEC devices and call
+:c:func:`dvb_register_frontend()`,
+in order to register the new frontend at the subsystem. At device
+detach/removal, the bridge driver should call
+:c:func:`dvb_unregister_frontend()` to
+remove the frontend from the core and then :c:func:`dvb_frontend_detach()`
+to free the memory allocated by the frontend drivers.
+
+The drivers should also call :c:func:`dvb_frontend_suspend()` as part of
+their handler for the :c:type:`device_driver`.\ ``suspend()``, and
+:c:func:`dvb_frontend_resume()` as
+part of their handler for :c:type:`device_driver`.\ ``resume()``.
+
+A few other optional functions are provided to handle some special cases.
+
+.. _dvbv5_stats:
+
+Digital TV Frontend statistics
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Introduction
+^^^^^^^^^^^^
+
+Digital TV frontends provide a range of
+:ref:`statistics <frontend-stat-properties>` meant to help tuning the device
+and measuring the quality of service.
+
+For each statistics measurement, the driver should set the type of scale used,
+or ``FE_SCALE_NOT_AVAILABLE`` if the statistics is not available on a given
+time. Drivers should also provide the number of statistics for each type.
+that's usually 1 for most video standards [#f2]_.
+
+Drivers should initialize each statistic counters with length and
+scale at its init code. For example, if the frontend provides signal
+strength, it should have, on its init code::
+
+ struct dtv_frontend_properties *c = &state->fe.dtv_property_cache;
+
+ c->strength.len = 1;
+ c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+
+And, when the statistics got updated, set the scale::
+
+ c->strength.stat[0].scale = FE_SCALE_DECIBEL;
+ c->strength.stat[0].uvalue = strength;
+
+.. [#f2] For ISDB-T, it may provide both a global statistics and a per-layer
+ set of statistics. On such cases, len should be equal to 4. The first
+ value corresponds to the global stat; the other ones to each layer, e. g.:
+
+ - c->cnr.stat[0] for global S/N carrier ratio,
+ - c->cnr.stat[1] for Layer A S/N carrier ratio,
+ - c->cnr.stat[2] for layer B S/N carrier ratio,
+ - c->cnr.stat[3] for layer C S/N carrier ratio.
+
+.. note:: Please prefer to use ``FE_SCALE_DECIBEL`` instead of
+ ``FE_SCALE_RELATIVE`` for signal strength and CNR measurements.
+
+Groups of statistics
+^^^^^^^^^^^^^^^^^^^^
+
+There are several groups of statistics currently supported:
+
+Signal strength (:ref:`DTV-STAT-SIGNAL-STRENGTH`)
+ - Measures the signal strength level at the analog part of the tuner or
+ demod.
+
+ - Typically obtained from the gain applied to the tuner and/or frontend
+ in order to detect the carrier. When no carrier is detected, the gain is
+ at the maximum value (so, strength is on its minimal).
+
+ - As the gain is visible through the set of registers that adjust the gain,
+ typically, this statistics is always available [#f3]_.
+
+ - Drivers should try to make it available all the times, as these statistics
+ can be used when adjusting an antenna position and to check for troubles
+ at the cabling.
+
+ .. [#f3] On a few devices, the gain keeps floating if there is no carrier.
+ On such devices, strength report should check first if carrier is
+ detected at the tuner (``FE_HAS_CARRIER``, see :c:type:`fe_status`),
+ and otherwise return the lowest possible value.
+
+Carrier Signal to Noise ratio (:ref:`DTV-STAT-CNR`)
+ - Signal to Noise ratio for the main carrier.
+
+ - Signal to Noise measurement depends on the device. On some hardware, it is
+ available when the main carrier is detected. On those hardware, CNR
+ measurement usually comes from the tuner (e. g. after ``FE_HAS_CARRIER``,
+ see :c:type:`fe_status`).
+
+ On other devices, it requires inner FEC decoding,
+ as the frontend measures it indirectly from other parameters (e. g. after
+ ``FE_HAS_VITERBI``, see :c:type:`fe_status`).
+
+ Having it available after inner FEC is more common.
+
+Bit counts post-FEC (:ref:`DTV-STAT-POST-ERROR-BIT-COUNT` and :ref:`DTV-STAT-POST-TOTAL-BIT-COUNT`)
+ - Those counters measure the number of bits and bit errors after
+ the forward error correction (FEC) on the inner coding block
+ (after Viterbi, LDPC or other inner code).
+
+ - Due to its nature, those statistics depend on full coding lock
+ (e. g. after ``FE_HAS_SYNC`` or after ``FE_HAS_LOCK``,
+ see :c:type:`fe_status`).
+
+Bit counts pre-FEC (:ref:`DTV-STAT-PRE-ERROR-BIT-COUNT` and :ref:`DTV-STAT-PRE-TOTAL-BIT-COUNT`)
+ - Those counters measure the number of bits and bit errors before
+ the forward error correction (FEC) on the inner coding block
+ (before Viterbi, LDPC or other inner code).
+
+ - Not all frontends provide this kind of statistics.
+
+ - Due to its nature, those statistics depend on inner coding lock (e. g.
+ after ``FE_HAS_VITERBI``, see :c:type:`fe_status`).
+
+Block counts (:ref:`DTV-STAT-ERROR-BLOCK-COUNT` and :ref:`DTV-STAT-TOTAL-BLOCK-COUNT`)
+ - Those counters measure the number of blocks and block errors after
+ the forward error correction (FEC) on the inner coding block
+ (before Viterbi, LDPC or other inner code).
+
+ - Due to its nature, those statistics depend on full coding lock
+ (e. g. after ``FE_HAS_SYNC`` or after
+ ``FE_HAS_LOCK``, see :c:type:`fe_status`).
+
+.. note:: All counters should be monotonically increased as they're
+ collected from the hardware.
+
+A typical example of the logic that handle status and statistics is::
+
+ static int foo_get_status_and_stats(struct dvb_frontend *fe)
+ {
+ struct foo_state *state = fe->demodulator_priv;
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+ int rc;
+ enum fe_status *status;
+
+ /* Both status and strength are always available */
+ rc = foo_read_status(fe, &status);
+ if (rc < 0)
+ return rc;
+
+ rc = foo_read_strength(fe);
+ if (rc < 0)
+ return rc;
+
+ /* Check if CNR is available */
+ if (!(fe->status & FE_HAS_CARRIER))
+ return 0;
+
+ rc = foo_read_cnr(fe);
+ if (rc < 0)
+ return rc;
+
+ /* Check if pre-BER stats are available */
+ if (!(fe->status & FE_HAS_VITERBI))
+ return 0;
+
+ rc = foo_get_pre_ber(fe);
+ if (rc < 0)
+ return rc;
+
+ /* Check if post-BER stats are available */
+ if (!(fe->status & FE_HAS_SYNC))
+ return 0;
+
+ rc = foo_get_post_ber(fe);
+ if (rc < 0)
+ return rc;
+ }
+
+ static const struct dvb_frontend_ops ops = {
+ /* ... */
+ .read_status = foo_get_status_and_stats,
+ };
+
+Statistics collection
+^^^^^^^^^^^^^^^^^^^^^
+
+On almost all frontend hardware, the bit and byte counts are stored by
+the hardware after a certain amount of time or after the total bit/block
+counter reaches a certain value (usually programmable), for example, on
+every 1000 ms or after receiving 1,000,000 bits.
+
+So, if you read the registers too soon, you'll end by reading the same
+value as in the previous reading, causing the monotonic value to be
+incremented too often.
+
+Drivers should take the responsibility to avoid too often reads. That
+can be done using two approaches:
+
+if the driver have a bit that indicates when a collected data is ready
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+Driver should check such bit before making the statistics available.
+
+An example of such behavior can be found at this code snippet (adapted
+from mb86a20s driver's logic)::
+
+ static int foo_get_pre_ber(struct dvb_frontend *fe)
+ {
+ struct foo_state *state = fe->demodulator_priv;
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ int rc, bit_error;
+
+ /* Check if the BER measures are already available */
+ rc = foo_read_u8(state, 0x54);
+ if (rc < 0)
+ return rc;
+
+ if (!rc)
+ return 0;
+
+ /* Read Bit Error Count */
+ bit_error = foo_read_u32(state, 0x55);
+ if (bit_error < 0)
+ return bit_error;
+
+ /* Read Total Bit Count */
+ rc = foo_read_u32(state, 0x51);
+ if (rc < 0)
+ return rc;
+
+ c->pre_bit_error.stat[0].scale = FE_SCALE_COUNTER;
+ c->pre_bit_error.stat[0].uvalue += bit_error;
+ c->pre_bit_count.stat[0].scale = FE_SCALE_COUNTER;
+ c->pre_bit_count.stat[0].uvalue += rc;
+
+ return 0;
+ }
+
+If the driver doesn't provide a statistics available check bit
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+A few devices, however, may not provide a way to check if the stats are
+available (or the way to check it is unknown). They may not even provide
+a way to directly read the total number of bits or blocks.
+
+On those devices, the driver need to ensure that it won't be reading from
+the register too often and/or estimate the total number of bits/blocks.
+
+On such drivers, a typical routine to get statistics would be like
+(adapted from dib8000 driver's logic)::
+
+ struct foo_state {
+ /* ... */
+
+ unsigned long per_jiffies_stats;
+ }
+
+ static int foo_get_pre_ber(struct dvb_frontend *fe)
+ {
+ struct foo_state *state = fe->demodulator_priv;
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ int rc, bit_error;
+ u64 bits;
+
+ /* Check if time for stats was elapsed */
+ if (!time_after(jiffies, state->per_jiffies_stats))
+ return 0;
+
+ /* Next stat should be collected in 1000 ms */
+ state->per_jiffies_stats = jiffies + msecs_to_jiffies(1000);
+
+ /* Read Bit Error Count */
+ bit_error = foo_read_u32(state, 0x55);
+ if (bit_error < 0)
+ return bit_error;
+
+ /*
+ * On this particular frontend, there's no register that
+ * would provide the number of bits per 1000ms sample. So,
+ * some function would calculate it based on DTV properties
+ */
+ bits = get_number_of_bits_per_1000ms(fe);
+
+ c->pre_bit_error.stat[0].scale = FE_SCALE_COUNTER;
+ c->pre_bit_error.stat[0].uvalue += bit_error;
+ c->pre_bit_count.stat[0].scale = FE_SCALE_COUNTER;
+ c->pre_bit_count.stat[0].uvalue += bits;
+
+ return 0;
+ }
+
+Please notice that, on both cases, we're getting the statistics using the
+:c:type:`dvb_frontend_ops` ``.read_status`` callback. The rationale is that
+the frontend core will automatically call this function periodically
+(usually, 3 times per second, when the frontend is locked).
+
+That warrants that we won't miss to collect a counter and increment the
+monotonic stats at the right time.
+
+Digital TV Frontend functions and types
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/media/dvb_frontend.h
diff --git a/Documentation/driver-api/media/dtv-net.rst b/Documentation/driver-api/media/dtv-net.rst
new file mode 100644
index 0000000000..deb6bffe96
--- /dev/null
+++ b/Documentation/driver-api/media/dtv-net.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Digital TV Network kABI
+-----------------------
+
+.. kernel-doc:: include/media/dvb_net.h
diff --git a/Documentation/driver-api/media/index.rst b/Documentation/driver-api/media/index.rst
new file mode 100644
index 0000000000..08e2065674
--- /dev/null
+++ b/Documentation/driver-api/media/index.rst
@@ -0,0 +1,59 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. include:: <isonum.txt>
+
+===================================
+Media subsystem kernel internal API
+===================================
+
+This section contains usage information about media subsystem and
+its supported drivers.
+
+Please see:
+
+Documentation/admin-guide/media/index.rst
+
+ - for usage information about media subsystem and supported drivers;
+
+Documentation/userspace-api/media/index.rst
+
+ - for the userspace APIs used on media devices.
+
+
+.. only:: html
+
+ .. class:: toc-title
+
+ Table of Contents
+
+.. toctree::
+ :maxdepth: 5
+ :numbered:
+
+ maintainer-entry-profile
+
+ v4l2-core
+ dtv-core
+ rc-core
+ mc-core
+ cec-core
+ tx-rx
+ camera-sensor
+
+ drivers/index
+
+**Copyright** |copy| 2009-2020 : LinuxTV Developers
+
+::
+
+ This documentation is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at your option) any
+ later version.
+
+ This program is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ more details.
+
+ For more details see the file COPYING in the source distribution of Linux.
diff --git a/Documentation/driver-api/media/maintainer-entry-profile.rst b/Documentation/driver-api/media/maintainer-entry-profile.rst
new file mode 100644
index 0000000000..ffc712a5f6
--- /dev/null
+++ b/Documentation/driver-api/media/maintainer-entry-profile.rst
@@ -0,0 +1,206 @@
+Media Subsystem Profile
+=======================
+
+Overview
+--------
+
+The media subsystem covers support for a variety of devices: stream
+capture, analog and digital TV streams, cameras, remote controllers, HDMI CEC
+and media pipeline control.
+
+It covers, mainly, the contents of those directories:
+
+ - drivers/media
+ - drivers/staging/media
+ - Documentation/admin-guide/media
+ - Documentation/driver-api/media
+ - Documentation/userspace-api/media
+ - Documentation/devicetree/bindings/media/\ [1]_
+ - include/media
+
+.. [1] Device tree bindings are maintained by the
+ OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS maintainers
+ (see the MAINTAINERS file). So, changes there must be reviewed
+ by them before being merged via the media subsystem's development
+ tree.
+
+Both media userspace and Kernel APIs are documented and the documentation
+must be kept in sync with the API changes. It means that all patches that
+add new features to the subsystem must also bring changes to the
+corresponding API files.
+
+Due to the size and wide scope of the media subsystem, media's
+maintainership model is to have sub-maintainers that have a broad
+knowledge of a specific aspect of the subsystem. It is the sub-maintainers'
+task to review the patches, providing feedback to users if the patches are
+following the subsystem rules and are properly using the media kernel and
+userspace APIs.
+
+Patches for the media subsystem must be sent to the media mailing list
+at linux-media@vger.kernel.org as plain text only e-mail. Emails with
+HTML will be automatically rejected by the mail server. It could be wise
+to also copy the sub-maintainer(s).
+
+Media's workflow is heavily based on Patchwork, meaning that, once a patch
+is submitted, the e-mail will first be accepted by the mailing list
+server, and, after a while, it should appear at:
+
+ - https://patchwork.linuxtv.org/project/linux-media/list/
+
+If it doesn't automatically appear there after a few minutes, then
+probably something went wrong on your submission. Please check if the
+email is in plain text\ [2]_ only and if your emailer is not mangling
+whitespaces before complaining or submitting them again.
+
+You can check if the mailing list server accepted your patch, by looking at:
+
+ - https://lore.kernel.org/linux-media/
+
+.. [2] If your email contains HTML, the mailing list server will simply
+ drop it, without any further notice.
+
+
+Media maintainers
++++++++++++++++++
+
+At the media subsystem, we have a group of senior developers that
+are responsible for doing the code reviews at the drivers (also known as
+sub-maintainers), and another senior developer responsible for the
+subsystem as a whole. For core changes, whenever possible, multiple
+media maintainers do the review.
+
+The media maintainers that work on specific areas of the subsystem are:
+
+- Remote Controllers (infrared):
+ Sean Young <sean@mess.org>
+
+- HDMI CEC:
+ Hans Verkuil <hverkuil@xs4all.nl>
+
+- Media controller drivers:
+ Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+
+- ISP, v4l2-async, v4l2-fwnode, v4l2-flash-led-class and Sensor drivers:
+ Sakari Ailus <sakari.ailus@linux.intel.com>
+
+- V4L2 drivers and core V4L2 frameworks:
+ Hans Verkuil <hverkuil@xs4all.nl>
+
+The subsystem maintainer is:
+ Mauro Carvalho Chehab <mchehab@kernel.org>
+
+Media maintainers may delegate a patch to other media maintainers as needed.
+On such case, checkpatch's ``delegate`` field indicates who's currently
+responsible for reviewing a patch.
+
+Submit Checklist Addendum
+-------------------------
+
+Patches that change the Open Firmware/Device Tree bindings must be
+reviewed by the Device Tree maintainers. So, DT maintainers should be
+Cc:ed when those are submitted via devicetree@vger.kernel.org mailing
+list.
+
+There is a set of compliance tools at https://git.linuxtv.org/v4l-utils.git/
+that should be used in order to check if the drivers are properly
+implementing the media APIs:
+
+==================== =======================================================
+Type Tool
+==================== =======================================================
+V4L2 drivers\ [3]_ ``v4l2-compliance``
+V4L2 virtual drivers ``contrib/test/test-media``
+CEC drivers ``cec-compliance``
+==================== =======================================================
+
+.. [3] The ``v4l2-compliance`` also covers the media controller usage inside
+ V4L2 drivers.
+
+Other compilance tools are under development to check other parts of the
+subsystem.
+
+Those tests need to pass before the patches go upstream.
+
+Also, please notice that we build the Kernel with::
+
+ make CF=-D__CHECK_ENDIAN__ CONFIG_DEBUG_SECTION_MISMATCH=y C=1 W=1 CHECK=check_script
+
+Where the check script is::
+
+ #!/bin/bash
+ /devel/smatch/smatch -p=kernel $@ >&2
+ /devel/sparse/sparse $@ >&2
+
+Be sure to not introduce new warnings on your patches without a
+very good reason.
+
+Style Cleanup Patches
++++++++++++++++++++++
+
+Style cleanups are welcome when they come together with other changes
+at the files where the style changes will affect.
+
+We may accept pure standalone style cleanups, but they should ideally
+be one patch for the whole subsystem (if the cleanup is low volume),
+or at least be grouped per directory. So, for example, if you're doing a
+big cleanup change set at drivers under drivers/media, please send a single
+patch for all drivers under drivers/media/pci, another one for
+drivers/media/usb and so on.
+
+Coding Style Addendum
++++++++++++++++++++++
+
+Media development uses ``checkpatch.pl`` on strict mode to verify the code
+style, e.g.::
+
+ $ ./scripts/checkpatch.pl --strict --max-line-length=80
+
+In principle, patches should follow the coding style rules, but exceptions
+are allowed if there are good reasons. On such case, maintainers and reviewers
+may question about the rationale for not addressing the ``checkpatch.pl``.
+
+Please notice that the goal here is to improve code readability. On
+a few cases, ``checkpatch.pl`` may actually point to something that would
+look worse. So, you should use good sense.
+
+Note that addressing one ``checkpatch.pl`` issue (of any kind) alone may lead
+to having longer lines than 80 characters per line. While this is not
+strictly prohibited, efforts should be made towards staying within 80
+characters per line. This could include using re-factoring code that leads
+to less indentation, shorter variable or function names and last but not
+least, simply wrapping the lines.
+
+In particular, we accept lines with more than 80 columns:
+
+ - on strings, as they shouldn't be broken due to line length limits;
+ - when a function or variable name need to have a big identifier name,
+ which keeps hard to honor the 80 columns limit;
+ - on arithmetic expressions, when breaking lines makes them harder to
+ read;
+ - when they avoid a line to end with an open parenthesis or an open
+ bracket.
+
+Key Cycle Dates
+---------------
+
+New submissions can be sent at any time, but if they intend to hit the
+next merge window they should be sent before -rc5, and ideally stabilized
+in the linux-media branch by -rc6.
+
+Review Cadence
+--------------
+
+Provided that your patch is at https://patchwork.linuxtv.org, it should
+be sooner or later handled, so you don't need to re-submit a patch.
+
+Except for bug fixes, we don't usually add new patches to the development
+tree between -rc6 and the next -rc1.
+
+Please notice that the media subsystem is a high traffic one, so it
+could take a while for us to be able to review your patches. Feel free
+to ping if you don't get a feedback in a couple of weeks or to ask
+other developers to publicly add Reviewed-by and, more importantly,
+``Tested-by:`` tags.
+
+Please note that we expect a detailed description for ``Tested-by:``,
+identifying what boards were used at the test and what it was tested.
diff --git a/Documentation/driver-api/media/mc-core.rst b/Documentation/driver-api/media/mc-core.rst
new file mode 100644
index 0000000000..2456950ce8
--- /dev/null
+++ b/Documentation/driver-api/media/mc-core.rst
@@ -0,0 +1,326 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Media Controller devices
+------------------------
+
+Media Controller
+~~~~~~~~~~~~~~~~
+
+The media controller userspace API is documented in
+:ref:`the Media Controller uAPI book <media_controller>`. This document focus
+on the kernel-side implementation of the media framework.
+
+Abstract media device model
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Discovering a device internal topology, and configuring it at runtime, is one
+of the goals of the media framework. To achieve this, hardware devices are
+modelled as an oriented graph of building blocks called entities connected
+through pads.
+
+An entity is a basic media hardware building block. It can correspond to
+a large variety of logical blocks such as physical hardware devices
+(CMOS sensor for instance), logical hardware devices (a building block
+in a System-on-Chip image processing pipeline), DMA channels or physical
+connectors.
+
+A pad is a connection endpoint through which an entity can interact with
+other entities. Data (not restricted to video) produced by an entity
+flows from the entity's output to one or more entity inputs. Pads should
+not be confused with physical pins at chip boundaries.
+
+A link is a point-to-point oriented connection between two pads, either
+on the same entity or on different entities. Data flows from a source
+pad to a sink pad.
+
+Media device
+^^^^^^^^^^^^
+
+A media device is represented by a struct media_device
+instance, defined in ``include/media/media-device.h``.
+Allocation of the structure is handled by the media device driver, usually by
+embedding the :c:type:`media_device` instance in a larger driver-specific
+structure.
+
+Drivers initialise media device instances by calling
+:c:func:`media_device_init()`. After initialising a media device instance, it is
+registered by calling :c:func:`__media_device_register()` via the macro
+``media_device_register()`` and unregistered by calling
+:c:func:`media_device_unregister()`. An initialised media device must be
+eventually cleaned up by calling :c:func:`media_device_cleanup()`.
+
+Note that it is not allowed to unregister a media device instance that was not
+previously registered, or clean up a media device instance that was not
+previously initialised.
+
+Entities
+^^^^^^^^
+
+Entities are represented by a struct media_entity
+instance, defined in ``include/media/media-entity.h``. The structure is usually
+embedded into a higher-level structure, such as
+:c:type:`v4l2_subdev` or :c:type:`video_device`
+instances, although drivers can allocate entities directly.
+
+Drivers initialize entity pads by calling
+:c:func:`media_entity_pads_init()`.
+
+Drivers register entities with a media device by calling
+:c:func:`media_device_register_entity()`
+and unregistered by calling
+:c:func:`media_device_unregister_entity()`.
+
+Interfaces
+^^^^^^^^^^
+
+Interfaces are represented by a
+struct media_interface instance, defined in
+``include/media/media-entity.h``. Currently, only one type of interface is
+defined: a device node. Such interfaces are represented by a
+struct media_intf_devnode.
+
+Drivers initialize and create device node interfaces by calling
+:c:func:`media_devnode_create()`
+and remove them by calling:
+:c:func:`media_devnode_remove()`.
+
+Pads
+^^^^
+Pads are represented by a struct media_pad instance,
+defined in ``include/media/media-entity.h``. Each entity stores its pads in
+a pads array managed by the entity driver. Drivers usually embed the array in
+a driver-specific structure.
+
+Pads are identified by their entity and their 0-based index in the pads
+array.
+
+Both information are stored in the struct media_pad,
+making the struct media_pad pointer the canonical way
+to store and pass link references.
+
+Pads have flags that describe the pad capabilities and state.
+
+``MEDIA_PAD_FL_SINK`` indicates that the pad supports sinking data.
+``MEDIA_PAD_FL_SOURCE`` indicates that the pad supports sourcing data.
+
+.. note::
+
+ One and only one of ``MEDIA_PAD_FL_SINK`` or ``MEDIA_PAD_FL_SOURCE`` must
+ be set for each pad.
+
+Links
+^^^^^
+
+Links are represented by a struct media_link instance,
+defined in ``include/media/media-entity.h``. There are two types of links:
+
+**1. pad to pad links**:
+
+Associate two entities via their PADs. Each entity has a list that points
+to all links originating at or targeting any of its pads.
+A given link is thus stored twice, once in the source entity and once in
+the target entity.
+
+Drivers create pad to pad links by calling:
+:c:func:`media_create_pad_link()` and remove with
+:c:func:`media_entity_remove_links()`.
+
+**2. interface to entity links**:
+
+Associate one interface to a Link.
+
+Drivers create interface to entity links by calling:
+:c:func:`media_create_intf_link()` and remove with
+:c:func:`media_remove_intf_links()`.
+
+.. note::
+
+ Links can only be created after having both ends already created.
+
+Links have flags that describe the link capabilities and state. The
+valid values are described at :c:func:`media_create_pad_link()` and
+:c:func:`media_create_intf_link()`.
+
+Graph traversal
+^^^^^^^^^^^^^^^
+
+The media framework provides APIs to iterate over entities in a graph.
+
+To iterate over all entities belonging to a media device, drivers can use
+the media_device_for_each_entity macro, defined in
+``include/media/media-device.h``.
+
+.. code-block:: c
+
+ struct media_entity *entity;
+
+ media_device_for_each_entity(entity, mdev) {
+ // entity will point to each entity in turn
+ ...
+ }
+
+Drivers might also need to iterate over all entities in a graph that can be
+reached only through enabled links starting at a given entity. The media
+framework provides a depth-first graph traversal API for that purpose.
+
+.. note::
+
+ Graphs with cycles (whether directed or undirected) are **NOT**
+ supported by the graph traversal API. To prevent infinite loops, the graph
+ traversal code limits the maximum depth to ``MEDIA_ENTITY_ENUM_MAX_DEPTH``,
+ currently defined as 16.
+
+Drivers initiate a graph traversal by calling
+:c:func:`media_graph_walk_start()`
+
+The graph structure, provided by the caller, is initialized to start graph
+traversal at the given entity.
+
+Drivers can then retrieve the next entity by calling
+:c:func:`media_graph_walk_next()`
+
+When the graph traversal is complete the function will return ``NULL``.
+
+Graph traversal can be interrupted at any moment. No cleanup function call
+is required and the graph structure can be freed normally.
+
+Helper functions can be used to find a link between two given pads, or a pad
+connected to another pad through an enabled link
+(:c:func:`media_entity_find_link()`, :c:func:`media_pad_remote_pad_first()`,
+:c:func:`media_entity_remote_source_pad_unique()` and
+:c:func:`media_pad_remote_pad_unique()`).
+
+Use count and power handling
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Due to the wide differences between drivers regarding power management
+needs, the media controller does not implement power management. However,
+the struct media_entity includes a ``use_count``
+field that media drivers
+can use to track the number of users of every entity for power management
+needs.
+
+The :c:type:`media_entity<media_entity>`.\ ``use_count`` field is owned by
+media drivers and must not be
+touched by entity drivers. Access to the field must be protected by the
+:c:type:`media_device`.\ ``graph_mutex`` lock.
+
+Links setup
+^^^^^^^^^^^
+
+Link properties can be modified at runtime by calling
+:c:func:`media_entity_setup_link()`.
+
+Pipelines and media streams
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+A media stream is a stream of pixels or metadata originating from one or more
+source devices (such as a sensors) and flowing through media entity pads
+towards the final sinks. The stream can be modified on the route by the
+devices (e.g. scaling or pixel format conversions), or it can be split into
+multiple branches, or multiple branches can be merged.
+
+A media pipeline is a set of media streams which are interdependent. This
+interdependency can be caused by the hardware (e.g. configuration of a second
+stream cannot be changed if the first stream has been enabled) or by the driver
+due to the software design. Most commonly a media pipeline consists of a single
+stream which does not branch.
+
+When starting streaming, drivers must notify all entities in the pipeline to
+prevent link states from being modified during streaming by calling
+:c:func:`media_pipeline_start()`.
+
+The function will mark all the pads which are part of the pipeline as streaming.
+
+The struct media_pipeline instance pointed to by the pipe argument will be
+stored in every pad in the pipeline. Drivers should embed the struct
+media_pipeline in higher-level pipeline structures and can then access the
+pipeline through the struct media_pad pipe field.
+
+Calls to :c:func:`media_pipeline_start()` can be nested.
+The pipeline pointer must be identical for all nested calls to the function.
+
+:c:func:`media_pipeline_start()` may return an error. In that case,
+it will clean up any of the changes it did by itself.
+
+When stopping the stream, drivers must notify the entities with
+:c:func:`media_pipeline_stop()`.
+
+If multiple calls to :c:func:`media_pipeline_start()` have been
+made the same number of :c:func:`media_pipeline_stop()` calls
+are required to stop streaming.
+The :c:type:`media_entity`.\ ``pipe`` field is reset to ``NULL`` on the last
+nested stop call.
+
+Link configuration will fail with ``-EBUSY`` by default if either end of the
+link is a streaming entity. Links that can be modified while streaming must
+be marked with the ``MEDIA_LNK_FL_DYNAMIC`` flag.
+
+If other operations need to be disallowed on streaming entities (such as
+changing entities configuration parameters) drivers can explicitly check the
+media_entity stream_count field to find out if an entity is streaming. This
+operation must be done with the media_device graph_mutex held.
+
+Link validation
+^^^^^^^^^^^^^^^
+
+Link validation is performed by :c:func:`media_pipeline_start()`
+for any entity which has sink pads in the pipeline. The
+:c:type:`media_entity`.\ ``link_validate()`` callback is used for that
+purpose. In ``link_validate()`` callback, entity driver should check
+that the properties of the source pad of the connected entity and its own
+sink pad match. It is up to the type of the entity (and in the end, the
+properties of the hardware) what matching actually means.
+
+Subsystems should facilitate link validation by providing subsystem specific
+helper functions to provide easy access for commonly needed information, and
+in the end provide a way to use driver-specific callbacks.
+
+Media Controller Device Allocator API
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+When the media device belongs to more than one driver, the shared media
+device is allocated with the shared struct device as the key for look ups.
+
+The shared media device should stay in registered state until the last
+driver unregisters it. In addition, the media device should be released when
+all the references are released. Each driver gets a reference to the media
+device during probe, when it allocates the media device. If media device is
+already allocated, the allocate API bumps up the refcount and returns the
+existing media device. The driver puts the reference back in its disconnect
+routine when it calls :c:func:`media_device_delete()`.
+
+The media device is unregistered and cleaned up from the kref put handler to
+ensure that the media device stays in registered state until the last driver
+unregisters the media device.
+
+**Driver Usage**
+
+Drivers should use the appropriate media-core routines to manage the shared
+media device life-time handling the two states:
+1. allocate -> register -> delete
+2. get reference to already registered device -> delete
+
+call :c:func:`media_device_delete()` routine to make sure the shared media
+device delete is handled correctly.
+
+**driver probe:**
+Call :c:func:`media_device_usb_allocate()` to allocate or get a reference
+Call :c:func:`media_device_register()`, if media devnode isn't registered
+
+**driver disconnect:**
+Call :c:func:`media_device_delete()` to free the media_device. Freeing is
+handled by the kref put handler.
+
+API Definitions
+^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/media-device.h
+
+.. kernel-doc:: include/media/media-devnode.h
+
+.. kernel-doc:: include/media/media-entity.h
+
+.. kernel-doc:: include/media/media-request.h
+
+.. kernel-doc:: include/media/media-dev-allocator.h
diff --git a/Documentation/driver-api/media/rc-core.rst b/Documentation/driver-api/media/rc-core.rst
new file mode 100644
index 0000000000..53f5e643b6
--- /dev/null
+++ b/Documentation/driver-api/media/rc-core.rst
@@ -0,0 +1,88 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Remote Controller devices
+-------------------------
+
+Remote Controller core
+~~~~~~~~~~~~~~~~~~~~~~
+
+The remote controller core implements infrastructure to receive and send
+remote controller keyboard keystrokes and mouse events.
+
+Every time a key is pressed on a remote controller, a scan code is produced.
+Also, on most hardware, keeping a key pressed for more than a few dozens of
+milliseconds produce a repeat key event. That's somewhat similar to what
+a normal keyboard or mouse is handled internally on Linux\ [#f1]_. So, the
+remote controller core is implemented on the top of the linux input/evdev
+interface.
+
+.. [#f1]
+
+ The main difference is that, on keyboard events, the keyboard controller
+ produces one event for a key press and another one for key release. On
+ infrared-based remote controllers, there's no key release event. Instead,
+ an extra code is produced to indicate key repeats.
+
+However, most of the remote controllers use infrared (IR) to transmit signals.
+As there are several protocols used to modulate infrared signals, one
+important part of the core is dedicated to adjust the driver and the core
+system to support the infrared protocol used by the emitter.
+
+The infrared transmission is done by blinking a infrared emitter using a
+carrier. The carrier can be switched on or off by the IR transmitter
+hardware. When the carrier is switched on, it is called *PULSE*.
+When the carrier is switched off, it is called *SPACE*.
+
+In other words, a typical IR transmission can be viewed as a sequence of
+*PULSE* and *SPACE* events, each with a given duration.
+
+The carrier parameters (frequency, duty cycle) and the intervals for
+*PULSE* and *SPACE* events depend on the protocol.
+For example, the NEC protocol uses a carrier of 38kHz, and transmissions
+start with a 9ms *PULSE* and a 4.5ms SPACE. It then transmits 16 bits of
+scan code, being 8 bits for address (usually it is a fixed number for a
+given remote controller), followed by 8 bits of code. A bit "1" is modulated
+with 560µs *PULSE* followed by 1690µs *SPACE* and a bit "0" is modulated
+with 560µs *PULSE* followed by 560µs *SPACE*.
+
+At receiver, a simple low-pass filter can be used to convert the received
+signal in a sequence of *PULSE/SPACE* events, filtering out the carrier
+frequency. Due to that, the receiver doesn't care about the carrier's
+actual frequency parameters: all it has to do is to measure the amount
+of time it receives *PULSE/SPACE* events.
+So, a simple IR receiver hardware will just provide a sequence of timings
+for those events to the Kernel. The drivers for hardware with such kind of
+receivers are identified by ``RC_DRIVER_IR_RAW``, as defined by
+:c:type:`rc_driver_type`\ [#f2]_. Other hardware come with a
+microcontroller that decode the *PULSE/SPACE* sequence and return scan
+codes to the Kernel. Such kind of receivers are identified
+by ``RC_DRIVER_SCANCODE``.
+
+.. [#f2]
+
+ The RC core also supports devices that have just IR emitters,
+ without any receivers. Right now, all such devices work only in
+ raw TX mode. Such kind of hardware is identified as
+ ``RC_DRIVER_IR_RAW_TX``.
+
+When the RC core receives events produced by ``RC_DRIVER_IR_RAW`` IR
+receivers, it needs to decode the IR protocol, in order to obtain the
+corresponding scan code. The protocols supported by the RC core are
+defined at enum :c:type:`rc_proto`.
+
+When the RC code receives a scan code (either directly, by a driver
+of the type ``RC_DRIVER_SCANCODE``, or via its IR decoders), it needs
+to convert into a Linux input event code. This is done via a mapping
+table.
+
+The Kernel has support for mapping tables available on most media
+devices. It also supports loading a table in runtime, via some
+sysfs nodes. See the :ref:`RC userspace API <Remote_controllers_Intro>`
+for more details.
+
+Remote controller data structures and functions
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/rc-core.h
+
+.. kernel-doc:: include/media/rc-map.h
diff --git a/Documentation/driver-api/media/tx-rx.rst b/Documentation/driver-api/media/tx-rx.rst
new file mode 100644
index 0000000000..e1e9258dd8
--- /dev/null
+++ b/Documentation/driver-api/media/tx-rx.rst
@@ -0,0 +1,133 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. _transmitter-receiver:
+
+Pixel data transmitter and receiver drivers
+===========================================
+
+V4L2 supports various devices that transmit and receive pixel data. Examples of
+these devices include a camera sensor, a TV tuner and a parallel or a CSI-2
+receiver in an SoC.
+
+Bus types
+---------
+
+The following busses are the most common. This section discusses these two only.
+
+MIPI CSI-2
+^^^^^^^^^^
+
+CSI-2 is a data bus intended for transferring images from cameras to
+the host SoC. It is defined by the `MIPI alliance`_.
+
+.. _`MIPI alliance`: https://www.mipi.org/
+
+Parallel
+^^^^^^^^
+
+`BT.601`_ and `BT.656`_ are the most common parallel busses.
+
+.. _`BT.601`: https://en.wikipedia.org/wiki/Rec._601
+.. _`BT.656`: https://en.wikipedia.org/wiki/ITU-R_BT.656
+
+Transmitter drivers
+-------------------
+
+Transmitter drivers generally need to provide the receiver drivers with the
+configuration of the transmitter. What is required depends on the type of the
+bus. These are common for both busses.
+
+Media bus pixel code
+^^^^^^^^^^^^^^^^^^^^
+
+See :ref:`v4l2-mbus-pixelcode`.
+
+Link frequency
+^^^^^^^^^^^^^^
+
+The :ref:`V4L2_CID_LINK_FREQ <v4l2-cid-link-freq>` control is used to tell the
+receiver the frequency of the bus (i.e. it is not the same as the symbol rate).
+
+``.s_stream()`` callback
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+The struct struct v4l2_subdev_video_ops->s_stream() callback is used by the
+receiver driver to control the transmitter driver's streaming state.
+
+
+CSI-2 transmitter drivers
+-------------------------
+
+Pixel rate
+^^^^^^^^^^
+
+The pixel rate on the bus is calculated as follows::
+
+ pixel_rate = link_freq * 2 * nr_of_lanes * 16 / k / bits_per_sample
+
+where
+
+.. list-table:: variables in pixel rate calculation
+ :header-rows: 1
+
+ * - variable or constant
+ - description
+ * - link_freq
+ - The value of the ``V4L2_CID_LINK_FREQ`` integer64 menu item.
+ * - nr_of_lanes
+ - Number of data lanes used on the CSI-2 link. This can
+ be obtained from the OF endpoint configuration.
+ * - 2
+ - Data is transferred on both rising and falling edge of the signal.
+ * - bits_per_sample
+ - Number of bits per sample.
+ * - k
+ - 16 for D-PHY and 7 for C-PHY
+
+.. note::
+
+ The pixel rate calculated this way is **not** the same thing as the
+ pixel rate on the camera sensor's pixel array which is indicated by the
+ :ref:`V4L2_CID_PIXEL_RATE <v4l2-cid-pixel-rate>` control.
+
+LP-11 and LP-111 modes
+^^^^^^^^^^^^^^^^^^^^^^
+
+As part of transitioning to high speed mode, a CSI-2 transmitter typically
+briefly sets the bus to LP-11 or LP-111 state, depending on the PHY. This period
+may be as short as 100 µs, during which the receiver observes this state and
+proceeds its own part of high speed mode transition.
+
+Most receivers are capable of autonomously handling this once the software has
+configured them to do so, but there are receivers which require software
+involvement in observing LP-11 or LP-111 state. 100 µs is a brief period to hit
+in software, especially when there is no interrupt telling something is
+happening.
+
+One way to address this is to configure the transmitter side explicitly to LP-11
+or LP-111 mode, which requires support from the transmitter hardware. This is
+not universally available. Many devices return to this state once streaming is
+stopped while the state after power-on is LP-00 or LP-000.
+
+The ``.pre_streamon()`` callback may be used to prepare a transmitter for
+transitioning to streaming state, but not yet start streaming. Similarly, the
+``.post_streamoff()`` callback is used to undo what was done by the
+``.pre_streamon()`` callback. The caller of ``.pre_streamon()`` is thus required
+to call ``.post_streamoff()`` for each successful call of ``.pre_streamon()``.
+
+In the context of CSI-2, the ``.pre_streamon()`` callback is used to transition
+the transmitter to the LP-11 or LP-111 mode. This also requires powering on the
+device, so this should be only done when it is needed.
+
+Receiver drivers that do not need explicit LP-11 or LP-111 mode setup are waived
+from calling the two callbacks.
+
+Stopping the transmitter
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+A transmitter stops sending the stream of images as a result of
+calling the ``.s_stream()`` callback. Some transmitters may stop the
+stream at a frame boundary whereas others stop immediately,
+effectively leaving the current frame unfinished. The receiver driver
+should not make assumptions either way, but function properly in both
+cases.
diff --git a/Documentation/driver-api/media/v4l2-async.rst b/Documentation/driver-api/media/v4l2-async.rst
new file mode 100644
index 0000000000..3422330b3b
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-async.rst
@@ -0,0 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 async kAPI
+^^^^^^^^^^^^^^^
+.. kernel-doc:: include/media/v4l2-async.h
diff --git a/Documentation/driver-api/media/v4l2-cci.rst b/Documentation/driver-api/media/v4l2-cci.rst
new file mode 100644
index 0000000000..dd297a40ed
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-cci.rst
@@ -0,0 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 CCI kAPI
+^^^^^^^^^^^^^
+.. kernel-doc:: include/media/v4l2-cci.h
diff --git a/Documentation/driver-api/media/v4l2-common.rst b/Documentation/driver-api/media/v4l2-common.rst
new file mode 100644
index 0000000000..b1e70eb56a
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-common.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 common functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/v4l2-common.h
+
+.. kernel-doc:: include/media/v4l2-ioctl.h
diff --git a/Documentation/driver-api/media/v4l2-controls.rst b/Documentation/driver-api/media/v4l2-controls.rst
new file mode 100644
index 0000000000..b2e9180482
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-controls.rst
@@ -0,0 +1,823 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 Controls
+=============
+
+Introduction
+------------
+
+The V4L2 control API seems simple enough, but quickly becomes very hard to
+implement correctly in drivers. But much of the code needed to handle controls
+is actually not driver specific and can be moved to the V4L core framework.
+
+After all, the only part that a driver developer is interested in is:
+
+1) How do I add a control?
+2) How do I set the control's value? (i.e. s_ctrl)
+
+And occasionally:
+
+3) How do I get the control's value? (i.e. g_volatile_ctrl)
+4) How do I validate the user's proposed control value? (i.e. try_ctrl)
+
+All the rest is something that can be done centrally.
+
+The control framework was created in order to implement all the rules of the
+V4L2 specification with respect to controls in a central place. And to make
+life as easy as possible for the driver developer.
+
+Note that the control framework relies on the presence of a struct
+:c:type:`v4l2_device` for V4L2 drivers and struct v4l2_subdev for
+sub-device drivers.
+
+
+Objects in the framework
+------------------------
+
+There are two main objects:
+
+The :c:type:`v4l2_ctrl` object describes the control properties and keeps
+track of the control's value (both the current value and the proposed new
+value).
+
+:c:type:`v4l2_ctrl_handler` is the object that keeps track of controls. It
+maintains a list of v4l2_ctrl objects that it owns and another list of
+references to controls, possibly to controls owned by other handlers.
+
+
+Basic usage for V4L2 and sub-device drivers
+-------------------------------------------
+
+1) Prepare the driver:
+
+.. code-block:: c
+
+ #include <media/v4l2-ctrls.h>
+
+1.1) Add the handler to your driver's top-level struct:
+
+For V4L2 drivers:
+
+.. code-block:: c
+
+ struct foo_dev {
+ ...
+ struct v4l2_device v4l2_dev;
+ ...
+ struct v4l2_ctrl_handler ctrl_handler;
+ ...
+ };
+
+For sub-device drivers:
+
+.. code-block:: c
+
+ struct foo_dev {
+ ...
+ struct v4l2_subdev sd;
+ ...
+ struct v4l2_ctrl_handler ctrl_handler;
+ ...
+ };
+
+1.2) Initialize the handler:
+
+.. code-block:: c
+
+ v4l2_ctrl_handler_init(&foo->ctrl_handler, nr_of_controls);
+
+The second argument is a hint telling the function how many controls this
+handler is expected to handle. It will allocate a hashtable based on this
+information. It is a hint only.
+
+1.3) Hook the control handler into the driver:
+
+For V4L2 drivers:
+
+.. code-block:: c
+
+ foo->v4l2_dev.ctrl_handler = &foo->ctrl_handler;
+
+For sub-device drivers:
+
+.. code-block:: c
+
+ foo->sd.ctrl_handler = &foo->ctrl_handler;
+
+1.4) Clean up the handler at the end:
+
+.. code-block:: c
+
+ v4l2_ctrl_handler_free(&foo->ctrl_handler);
+
+
+2) Add controls:
+
+You add non-menu controls by calling :c:func:`v4l2_ctrl_new_std`:
+
+.. code-block:: c
+
+ struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
+ const struct v4l2_ctrl_ops *ops,
+ u32 id, s32 min, s32 max, u32 step, s32 def);
+
+Menu and integer menu controls are added by calling
+:c:func:`v4l2_ctrl_new_std_menu`:
+
+.. code-block:: c
+
+ struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
+ const struct v4l2_ctrl_ops *ops,
+ u32 id, s32 max, s32 skip_mask, s32 def);
+
+Menu controls with a driver specific menu are added by calling
+:c:func:`v4l2_ctrl_new_std_menu_items`:
+
+.. code-block:: c
+
+ struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(
+ struct v4l2_ctrl_handler *hdl,
+ const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
+ s32 skip_mask, s32 def, const char * const *qmenu);
+
+Standard compound controls can be added by calling
+:c:func:`v4l2_ctrl_new_std_compound`:
+
+.. code-block:: c
+
+ struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl,
+ const struct v4l2_ctrl_ops *ops, u32 id,
+ const union v4l2_ctrl_ptr p_def);
+
+Integer menu controls with a driver specific menu can be added by calling
+:c:func:`v4l2_ctrl_new_int_menu`:
+
+.. code-block:: c
+
+ struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
+ const struct v4l2_ctrl_ops *ops,
+ u32 id, s32 max, s32 def, const s64 *qmenu_int);
+
+These functions are typically called right after the
+:c:func:`v4l2_ctrl_handler_init`:
+
+.. code-block:: c
+
+ static const s64 exp_bias_qmenu[] = {
+ -2, -1, 0, 1, 2
+ };
+ static const char * const test_pattern[] = {
+ "Disabled",
+ "Vertical Bars",
+ "Solid Black",
+ "Solid White",
+ };
+
+ v4l2_ctrl_handler_init(&foo->ctrl_handler, nr_of_controls);
+ v4l2_ctrl_new_std(&foo->ctrl_handler, &foo_ctrl_ops,
+ V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
+ v4l2_ctrl_new_std(&foo->ctrl_handler, &foo_ctrl_ops,
+ V4L2_CID_CONTRAST, 0, 255, 1, 128);
+ v4l2_ctrl_new_std_menu(&foo->ctrl_handler, &foo_ctrl_ops,
+ V4L2_CID_POWER_LINE_FREQUENCY,
+ V4L2_CID_POWER_LINE_FREQUENCY_60HZ, 0,
+ V4L2_CID_POWER_LINE_FREQUENCY_DISABLED);
+ v4l2_ctrl_new_int_menu(&foo->ctrl_handler, &foo_ctrl_ops,
+ V4L2_CID_EXPOSURE_BIAS,
+ ARRAY_SIZE(exp_bias_qmenu) - 1,
+ ARRAY_SIZE(exp_bias_qmenu) / 2 - 1,
+ exp_bias_qmenu);
+ v4l2_ctrl_new_std_menu_items(&foo->ctrl_handler, &foo_ctrl_ops,
+ V4L2_CID_TEST_PATTERN, ARRAY_SIZE(test_pattern) - 1, 0,
+ 0, test_pattern);
+ ...
+ if (foo->ctrl_handler.error) {
+ int err = foo->ctrl_handler.error;
+
+ v4l2_ctrl_handler_free(&foo->ctrl_handler);
+ return err;
+ }
+
+The :c:func:`v4l2_ctrl_new_std` function returns the v4l2_ctrl pointer to
+the new control, but if you do not need to access the pointer outside the
+control ops, then there is no need to store it.
+
+The :c:func:`v4l2_ctrl_new_std` function will fill in most fields based on
+the control ID except for the min, max, step and default values. These are
+passed in the last four arguments. These values are driver specific while
+control attributes like type, name, flags are all global. The control's
+current value will be set to the default value.
+
+The :c:func:`v4l2_ctrl_new_std_menu` function is very similar but it is
+used for menu controls. There is no min argument since that is always 0 for
+menu controls, and instead of a step there is a skip_mask argument: if bit
+X is 1, then menu item X is skipped.
+
+The :c:func:`v4l2_ctrl_new_int_menu` function creates a new standard
+integer menu control with driver-specific items in the menu. It differs
+from v4l2_ctrl_new_std_menu in that it doesn't have the mask argument and
+takes as the last argument an array of signed 64-bit integers that form an
+exact menu item list.
+
+The :c:func:`v4l2_ctrl_new_std_menu_items` function is very similar to
+v4l2_ctrl_new_std_menu but takes an extra parameter qmenu, which is the
+driver specific menu for an otherwise standard menu control. A good example
+for this control is the test pattern control for capture/display/sensors
+devices that have the capability to generate test patterns. These test
+patterns are hardware specific, so the contents of the menu will vary from
+device to device.
+
+Note that if something fails, the function will return NULL or an error and
+set ctrl_handler->error to the error code. If ctrl_handler->error was already
+set, then it will just return and do nothing. This is also true for
+v4l2_ctrl_handler_init if it cannot allocate the internal data structure.
+
+This makes it easy to init the handler and just add all controls and only check
+the error code at the end. Saves a lot of repetitive error checking.
+
+It is recommended to add controls in ascending control ID order: it will be
+a bit faster that way.
+
+3) Optionally force initial control setup:
+
+.. code-block:: c
+
+ v4l2_ctrl_handler_setup(&foo->ctrl_handler);
+
+This will call s_ctrl for all controls unconditionally. Effectively this
+initializes the hardware to the default control values. It is recommended
+that you do this as this ensures that both the internal data structures and
+the hardware are in sync.
+
+4) Finally: implement the :c:type:`v4l2_ctrl_ops`
+
+.. code-block:: c
+
+ static const struct v4l2_ctrl_ops foo_ctrl_ops = {
+ .s_ctrl = foo_s_ctrl,
+ };
+
+Usually all you need is s_ctrl:
+
+.. code-block:: c
+
+ static int foo_s_ctrl(struct v4l2_ctrl *ctrl)
+ {
+ struct foo *state = container_of(ctrl->handler, struct foo, ctrl_handler);
+
+ switch (ctrl->id) {
+ case V4L2_CID_BRIGHTNESS:
+ write_reg(0x123, ctrl->val);
+ break;
+ case V4L2_CID_CONTRAST:
+ write_reg(0x456, ctrl->val);
+ break;
+ }
+ return 0;
+ }
+
+The control ops are called with the v4l2_ctrl pointer as argument.
+The new control value has already been validated, so all you need to do is
+to actually update the hardware registers.
+
+You're done! And this is sufficient for most of the drivers we have. No need
+to do any validation of control values, or implement QUERYCTRL, QUERY_EXT_CTRL
+and QUERYMENU. And G/S_CTRL as well as G/TRY/S_EXT_CTRLS are automatically supported.
+
+
+.. note::
+
+ The remainder sections deal with more advanced controls topics and scenarios.
+ In practice the basic usage as described above is sufficient for most drivers.
+
+
+Inheriting Sub-device Controls
+------------------------------
+
+When a sub-device is registered with a V4L2 driver by calling
+v4l2_device_register_subdev() and the ctrl_handler fields of both v4l2_subdev
+and v4l2_device are set, then the controls of the subdev will become
+automatically available in the V4L2 driver as well. If the subdev driver
+contains controls that already exist in the V4L2 driver, then those will be
+skipped (so a V4L2 driver can always override a subdev control).
+
+What happens here is that v4l2_device_register_subdev() calls
+v4l2_ctrl_add_handler() adding the controls of the subdev to the controls
+of v4l2_device.
+
+
+Accessing Control Values
+------------------------
+
+The following union is used inside the control framework to access control
+values:
+
+.. code-block:: c
+
+ union v4l2_ctrl_ptr {
+ s32 *p_s32;
+ s64 *p_s64;
+ char *p_char;
+ void *p;
+ };
+
+The v4l2_ctrl struct contains these fields that can be used to access both
+current and new values:
+
+.. code-block:: c
+
+ s32 val;
+ struct {
+ s32 val;
+ } cur;
+
+
+ union v4l2_ctrl_ptr p_new;
+ union v4l2_ctrl_ptr p_cur;
+
+If the control has a simple s32 type, then:
+
+.. code-block:: c
+
+ &ctrl->val == ctrl->p_new.p_s32
+ &ctrl->cur.val == ctrl->p_cur.p_s32
+
+For all other types use ctrl->p_cur.p<something>. Basically the val
+and cur.val fields can be considered an alias since these are used so often.
+
+Within the control ops you can freely use these. The val and cur.val speak for
+themselves. The p_char pointers point to character buffers of length
+ctrl->maximum + 1, and are always 0-terminated.
+
+Unless the control is marked volatile the p_cur field points to the
+current cached control value. When you create a new control this value is made
+identical to the default value. After calling v4l2_ctrl_handler_setup() this
+value is passed to the hardware. It is generally a good idea to call this
+function.
+
+Whenever a new value is set that new value is automatically cached. This means
+that most drivers do not need to implement the g_volatile_ctrl() op. The
+exception is for controls that return a volatile register such as a signal
+strength read-out that changes continuously. In that case you will need to
+implement g_volatile_ctrl like this:
+
+.. code-block:: c
+
+ static int foo_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
+ {
+ switch (ctrl->id) {
+ case V4L2_CID_BRIGHTNESS:
+ ctrl->val = read_reg(0x123);
+ break;
+ }
+ }
+
+Note that you use the 'new value' union as well in g_volatile_ctrl. In general
+controls that need to implement g_volatile_ctrl are read-only controls. If they
+are not, a V4L2_EVENT_CTRL_CH_VALUE will not be generated when the control
+changes.
+
+To mark a control as volatile you have to set V4L2_CTRL_FLAG_VOLATILE:
+
+.. code-block:: c
+
+ ctrl = v4l2_ctrl_new_std(&sd->ctrl_handler, ...);
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+
+For try/s_ctrl the new values (i.e. as passed by the user) are filled in and
+you can modify them in try_ctrl or set them in s_ctrl. The 'cur' union
+contains the current value, which you can use (but not change!) as well.
+
+If s_ctrl returns 0 (OK), then the control framework will copy the new final
+values to the 'cur' union.
+
+While in g_volatile/s/try_ctrl you can access the value of all controls owned
+by the same handler since the handler's lock is held. If you need to access
+the value of controls owned by other handlers, then you have to be very careful
+not to introduce deadlocks.
+
+Outside of the control ops you have to go through to helper functions to get
+or set a single control value safely in your driver:
+
+.. code-block:: c
+
+ s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
+ int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
+
+These functions go through the control framework just as VIDIOC_G/S_CTRL ioctls
+do. Don't use these inside the control ops g_volatile/s/try_ctrl, though, that
+will result in a deadlock since these helpers lock the handler as well.
+
+You can also take the handler lock yourself:
+
+.. code-block:: c
+
+ mutex_lock(&state->ctrl_handler.lock);
+ pr_info("String value is '%s'\n", ctrl1->p_cur.p_char);
+ pr_info("Integer value is '%s'\n", ctrl2->cur.val);
+ mutex_unlock(&state->ctrl_handler.lock);
+
+
+Menu Controls
+-------------
+
+The v4l2_ctrl struct contains this union:
+
+.. code-block:: c
+
+ union {
+ u32 step;
+ u32 menu_skip_mask;
+ };
+
+For menu controls menu_skip_mask is used. What it does is that it allows you
+to easily exclude certain menu items. This is used in the VIDIOC_QUERYMENU
+implementation where you can return -EINVAL if a certain menu item is not
+present. Note that VIDIOC_QUERYCTRL always returns a step value of 1 for
+menu controls.
+
+A good example is the MPEG Audio Layer II Bitrate menu control where the
+menu is a list of standardized possible bitrates. But in practice hardware
+implementations will only support a subset of those. By setting the skip
+mask you can tell the framework which menu items should be skipped. Setting
+it to 0 means that all menu items are supported.
+
+You set this mask either through the v4l2_ctrl_config struct for a custom
+control, or by calling v4l2_ctrl_new_std_menu().
+
+
+Custom Controls
+---------------
+
+Driver specific controls can be created using v4l2_ctrl_new_custom():
+
+.. code-block:: c
+
+ static const struct v4l2_ctrl_config ctrl_filter = {
+ .ops = &ctrl_custom_ops,
+ .id = V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER,
+ .name = "Spatial Filter",
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .flags = V4L2_CTRL_FLAG_SLIDER,
+ .max = 15,
+ .step = 1,
+ };
+
+ ctrl = v4l2_ctrl_new_custom(&foo->ctrl_handler, &ctrl_filter, NULL);
+
+The last argument is the priv pointer which can be set to driver-specific
+private data.
+
+The v4l2_ctrl_config struct also has a field to set the is_private flag.
+
+If the name field is not set, then the framework will assume this is a standard
+control and will fill in the name, type and flags fields accordingly.
+
+
+Active and Grabbed Controls
+---------------------------
+
+If you get more complex relationships between controls, then you may have to
+activate and deactivate controls. For example, if the Chroma AGC control is
+on, then the Chroma Gain control is inactive. That is, you may set it, but
+the value will not be used by the hardware as long as the automatic gain
+control is on. Typically user interfaces can disable such input fields.
+
+You can set the 'active' status using v4l2_ctrl_activate(). By default all
+controls are active. Note that the framework does not check for this flag.
+It is meant purely for GUIs. The function is typically called from within
+s_ctrl.
+
+The other flag is the 'grabbed' flag. A grabbed control means that you cannot
+change it because it is in use by some resource. Typical examples are MPEG
+bitrate controls that cannot be changed while capturing is in progress.
+
+If a control is set to 'grabbed' using v4l2_ctrl_grab(), then the framework
+will return -EBUSY if an attempt is made to set this control. The
+v4l2_ctrl_grab() function is typically called from the driver when it
+starts or stops streaming.
+
+
+Control Clusters
+----------------
+
+By default all controls are independent from the others. But in more
+complex scenarios you can get dependencies from one control to another.
+In that case you need to 'cluster' them:
+
+.. code-block:: c
+
+ struct foo {
+ struct v4l2_ctrl_handler ctrl_handler;
+ #define AUDIO_CL_VOLUME (0)
+ #define AUDIO_CL_MUTE (1)
+ struct v4l2_ctrl *audio_cluster[2];
+ ...
+ };
+
+ state->audio_cluster[AUDIO_CL_VOLUME] =
+ v4l2_ctrl_new_std(&state->ctrl_handler, ...);
+ state->audio_cluster[AUDIO_CL_MUTE] =
+ v4l2_ctrl_new_std(&state->ctrl_handler, ...);
+ v4l2_ctrl_cluster(ARRAY_SIZE(state->audio_cluster), state->audio_cluster);
+
+From now on whenever one or more of the controls belonging to the same
+cluster is set (or 'gotten', or 'tried'), only the control ops of the first
+control ('volume' in this example) is called. You effectively create a new
+composite control. Similar to how a 'struct' works in C.
+
+So when s_ctrl is called with V4L2_CID_AUDIO_VOLUME as argument, you should set
+all two controls belonging to the audio_cluster:
+
+.. code-block:: c
+
+ static int foo_s_ctrl(struct v4l2_ctrl *ctrl)
+ {
+ struct foo *state = container_of(ctrl->handler, struct foo, ctrl_handler);
+
+ switch (ctrl->id) {
+ case V4L2_CID_AUDIO_VOLUME: {
+ struct v4l2_ctrl *mute = ctrl->cluster[AUDIO_CL_MUTE];
+
+ write_reg(0x123, mute->val ? 0 : ctrl->val);
+ break;
+ }
+ case V4L2_CID_CONTRAST:
+ write_reg(0x456, ctrl->val);
+ break;
+ }
+ return 0;
+ }
+
+In the example above the following are equivalent for the VOLUME case:
+
+.. code-block:: c
+
+ ctrl == ctrl->cluster[AUDIO_CL_VOLUME] == state->audio_cluster[AUDIO_CL_VOLUME]
+ ctrl->cluster[AUDIO_CL_MUTE] == state->audio_cluster[AUDIO_CL_MUTE]
+
+In practice using cluster arrays like this becomes very tiresome. So instead
+the following equivalent method is used:
+
+.. code-block:: c
+
+ struct {
+ /* audio cluster */
+ struct v4l2_ctrl *volume;
+ struct v4l2_ctrl *mute;
+ };
+
+The anonymous struct is used to clearly 'cluster' these two control pointers,
+but it serves no other purpose. The effect is the same as creating an
+array with two control pointers. So you can just do:
+
+.. code-block:: c
+
+ state->volume = v4l2_ctrl_new_std(&state->ctrl_handler, ...);
+ state->mute = v4l2_ctrl_new_std(&state->ctrl_handler, ...);
+ v4l2_ctrl_cluster(2, &state->volume);
+
+And in foo_s_ctrl you can use these pointers directly: state->mute->val.
+
+Note that controls in a cluster may be NULL. For example, if for some
+reason mute was never added (because the hardware doesn't support that
+particular feature), then mute will be NULL. So in that case we have a
+cluster of 2 controls, of which only 1 is actually instantiated. The
+only restriction is that the first control of the cluster must always be
+present, since that is the 'master' control of the cluster. The master
+control is the one that identifies the cluster and that provides the
+pointer to the v4l2_ctrl_ops struct that is used for that cluster.
+
+Obviously, all controls in the cluster array must be initialized to either
+a valid control or to NULL.
+
+In rare cases you might want to know which controls of a cluster actually
+were set explicitly by the user. For this you can check the 'is_new' flag of
+each control. For example, in the case of a volume/mute cluster the 'is_new'
+flag of the mute control would be set if the user called VIDIOC_S_CTRL for
+mute only. If the user would call VIDIOC_S_EXT_CTRLS for both mute and volume
+controls, then the 'is_new' flag would be 1 for both controls.
+
+The 'is_new' flag is always 1 when called from v4l2_ctrl_handler_setup().
+
+
+Handling autogain/gain-type Controls with Auto Clusters
+-------------------------------------------------------
+
+A common type of control cluster is one that handles 'auto-foo/foo'-type
+controls. Typical examples are autogain/gain, autoexposure/exposure,
+autowhitebalance/red balance/blue balance. In all cases you have one control
+that determines whether another control is handled automatically by the hardware,
+or whether it is under manual control from the user.
+
+If the cluster is in automatic mode, then the manual controls should be
+marked inactive and volatile. When the volatile controls are read the
+g_volatile_ctrl operation should return the value that the hardware's automatic
+mode set up automatically.
+
+If the cluster is put in manual mode, then the manual controls should become
+active again and the volatile flag is cleared (so g_volatile_ctrl is no longer
+called while in manual mode). In addition just before switching to manual mode
+the current values as determined by the auto mode are copied as the new manual
+values.
+
+Finally the V4L2_CTRL_FLAG_UPDATE should be set for the auto control since
+changing that control affects the control flags of the manual controls.
+
+In order to simplify this a special variation of v4l2_ctrl_cluster was
+introduced:
+
+.. code-block:: c
+
+ void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
+ u8 manual_val, bool set_volatile);
+
+The first two arguments are identical to v4l2_ctrl_cluster. The third argument
+tells the framework which value switches the cluster into manual mode. The
+last argument will optionally set V4L2_CTRL_FLAG_VOLATILE for the non-auto controls.
+If it is false, then the manual controls are never volatile. You would typically
+use that if the hardware does not give you the option to read back to values as
+determined by the auto mode (e.g. if autogain is on, the hardware doesn't allow
+you to obtain the current gain value).
+
+The first control of the cluster is assumed to be the 'auto' control.
+
+Using this function will ensure that you don't need to handle all the complex
+flag and volatile handling.
+
+
+VIDIOC_LOG_STATUS Support
+-------------------------
+
+This ioctl allow you to dump the current status of a driver to the kernel log.
+The v4l2_ctrl_handler_log_status(ctrl_handler, prefix) can be used to dump the
+value of the controls owned by the given handler to the log. You can supply a
+prefix as well. If the prefix didn't end with a space, then ': ' will be added
+for you.
+
+
+Different Handlers for Different Video Nodes
+--------------------------------------------
+
+Usually the V4L2 driver has just one control handler that is global for
+all video nodes. But you can also specify different control handlers for
+different video nodes. You can do that by manually setting the ctrl_handler
+field of struct video_device.
+
+That is no problem if there are no subdevs involved but if there are, then
+you need to block the automatic merging of subdev controls to the global
+control handler. You do that by simply setting the ctrl_handler field in
+struct v4l2_device to NULL. Now v4l2_device_register_subdev() will no longer
+merge subdev controls.
+
+After each subdev was added, you will then have to call v4l2_ctrl_add_handler
+manually to add the subdev's control handler (sd->ctrl_handler) to the desired
+control handler. This control handler may be specific to the video_device or
+for a subset of video_device's. For example: the radio device nodes only have
+audio controls, while the video and vbi device nodes share the same control
+handler for the audio and video controls.
+
+If you want to have one handler (e.g. for a radio device node) have a subset
+of another handler (e.g. for a video device node), then you should first add
+the controls to the first handler, add the other controls to the second
+handler and finally add the first handler to the second. For example:
+
+.. code-block:: c
+
+ v4l2_ctrl_new_std(&radio_ctrl_handler, &radio_ops, V4L2_CID_AUDIO_VOLUME, ...);
+ v4l2_ctrl_new_std(&radio_ctrl_handler, &radio_ops, V4L2_CID_AUDIO_MUTE, ...);
+ v4l2_ctrl_new_std(&video_ctrl_handler, &video_ops, V4L2_CID_BRIGHTNESS, ...);
+ v4l2_ctrl_new_std(&video_ctrl_handler, &video_ops, V4L2_CID_CONTRAST, ...);
+ v4l2_ctrl_add_handler(&video_ctrl_handler, &radio_ctrl_handler, NULL);
+
+The last argument to v4l2_ctrl_add_handler() is a filter function that allows
+you to filter which controls will be added. Set it to NULL if you want to add
+all controls.
+
+Or you can add specific controls to a handler:
+
+.. code-block:: c
+
+ volume = v4l2_ctrl_new_std(&video_ctrl_handler, &ops, V4L2_CID_AUDIO_VOLUME, ...);
+ v4l2_ctrl_new_std(&video_ctrl_handler, &ops, V4L2_CID_BRIGHTNESS, ...);
+ v4l2_ctrl_new_std(&video_ctrl_handler, &ops, V4L2_CID_CONTRAST, ...);
+
+What you should not do is make two identical controls for two handlers.
+For example:
+
+.. code-block:: c
+
+ v4l2_ctrl_new_std(&radio_ctrl_handler, &radio_ops, V4L2_CID_AUDIO_MUTE, ...);
+ v4l2_ctrl_new_std(&video_ctrl_handler, &video_ops, V4L2_CID_AUDIO_MUTE, ...);
+
+This would be bad since muting the radio would not change the video mute
+control. The rule is to have one control for each hardware 'knob' that you
+can twiddle.
+
+
+Finding Controls
+----------------
+
+Normally you have created the controls yourself and you can store the struct
+v4l2_ctrl pointer into your own struct.
+
+But sometimes you need to find a control from another handler that you do
+not own. For example, if you have to find a volume control from a subdev.
+
+You can do that by calling v4l2_ctrl_find:
+
+.. code-block:: c
+
+ struct v4l2_ctrl *volume;
+
+ volume = v4l2_ctrl_find(sd->ctrl_handler, V4L2_CID_AUDIO_VOLUME);
+
+Since v4l2_ctrl_find will lock the handler you have to be careful where you
+use it. For example, this is not a good idea:
+
+.. code-block:: c
+
+ struct v4l2_ctrl_handler ctrl_handler;
+
+ v4l2_ctrl_new_std(&ctrl_handler, &video_ops, V4L2_CID_BRIGHTNESS, ...);
+ v4l2_ctrl_new_std(&ctrl_handler, &video_ops, V4L2_CID_CONTRAST, ...);
+
+...and in video_ops.s_ctrl:
+
+.. code-block:: c
+
+ case V4L2_CID_BRIGHTNESS:
+ contrast = v4l2_find_ctrl(&ctrl_handler, V4L2_CID_CONTRAST);
+ ...
+
+When s_ctrl is called by the framework the ctrl_handler.lock is already taken, so
+attempting to find another control from the same handler will deadlock.
+
+It is recommended not to use this function from inside the control ops.
+
+
+Preventing Controls inheritance
+-------------------------------
+
+When one control handler is added to another using v4l2_ctrl_add_handler, then
+by default all controls from one are merged to the other. But a subdev might
+have low-level controls that make sense for some advanced embedded system, but
+not when it is used in consumer-level hardware. In that case you want to keep
+those low-level controls local to the subdev. You can do this by simply
+setting the 'is_private' flag of the control to 1:
+
+.. code-block:: c
+
+ static const struct v4l2_ctrl_config ctrl_private = {
+ .ops = &ctrl_custom_ops,
+ .id = V4L2_CID_...,
+ .name = "Some Private Control",
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .max = 15,
+ .step = 1,
+ .is_private = 1,
+ };
+
+ ctrl = v4l2_ctrl_new_custom(&foo->ctrl_handler, &ctrl_private, NULL);
+
+These controls will now be skipped when v4l2_ctrl_add_handler is called.
+
+
+V4L2_CTRL_TYPE_CTRL_CLASS Controls
+----------------------------------
+
+Controls of this type can be used by GUIs to get the name of the control class.
+A fully featured GUI can make a dialog with multiple tabs with each tab
+containing the controls belonging to a particular control class. The name of
+each tab can be found by querying a special control with ID <control class | 1>.
+
+Drivers do not have to care about this. The framework will automatically add
+a control of this type whenever the first control belonging to a new control
+class is added.
+
+
+Adding Notify Callbacks
+-----------------------
+
+Sometimes the platform or bridge driver needs to be notified when a control
+from a sub-device driver changes. You can set a notify callback by calling
+this function:
+
+.. code-block:: c
+
+ void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl,
+ void (*notify)(struct v4l2_ctrl *ctrl, void *priv), void *priv);
+
+Whenever the give control changes value the notify callback will be called
+with a pointer to the control and the priv pointer that was passed with
+v4l2_ctrl_notify. Note that the control's handler lock is held when the
+notify function is called.
+
+There can be only one notify function per control handler. Any attempt
+to set another notify function will cause a WARN_ON.
+
+v4l2_ctrl functions and data structures
+---------------------------------------
+
+.. kernel-doc:: include/media/v4l2-ctrls.h
diff --git a/Documentation/driver-api/media/v4l2-core.rst b/Documentation/driver-api/media/v4l2-core.rst
new file mode 100644
index 0000000000..239045ecc8
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-core.rst
@@ -0,0 +1,29 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Video4Linux devices
+-------------------
+
+.. toctree::
+ :maxdepth: 1
+
+ v4l2-intro
+ v4l2-dev
+ v4l2-device
+ v4l2-fh
+ v4l2-subdev
+ v4l2-event
+ v4l2-controls
+ v4l2-videobuf
+ v4l2-videobuf2
+ v4l2-dv-timings
+ v4l2-flash-led-class
+ v4l2-mc
+ v4l2-mediabus
+ v4l2-mem2mem
+ v4l2-async
+ v4l2-fwnode
+ v4l2-cci
+ v4l2-rect
+ v4l2-tuner
+ v4l2-common
+ v4l2-tveeprom
diff --git a/Documentation/driver-api/media/v4l2-dev.rst b/Documentation/driver-api/media/v4l2-dev.rst
new file mode 100644
index 0000000000..99e3b5fa74
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-dev.rst
@@ -0,0 +1,375 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Video device' s internal representation
+=======================================
+
+The actual device nodes in the ``/dev`` directory are created using the
+:c:type:`video_device` struct (``v4l2-dev.h``). This struct can either be
+allocated dynamically or embedded in a larger struct.
+
+To allocate it dynamically use :c:func:`video_device_alloc`:
+
+.. code-block:: c
+
+ struct video_device *vdev = video_device_alloc();
+
+ if (vdev == NULL)
+ return -ENOMEM;
+
+ vdev->release = video_device_release;
+
+If you embed it in a larger struct, then you must set the ``release()``
+callback to your own function:
+
+.. code-block:: c
+
+ struct video_device *vdev = &my_vdev->vdev;
+
+ vdev->release = my_vdev_release;
+
+The ``release()`` callback must be set and it is called when the last user
+of the video device exits.
+
+The default :c:func:`video_device_release` callback currently
+just calls ``kfree`` to free the allocated memory.
+
+There is also a :c:func:`video_device_release_empty` function that does
+nothing (is empty) and should be used if the struct is embedded and there
+is nothing to do when it is released.
+
+You should also set these fields of :c:type:`video_device`:
+
+- :c:type:`video_device`->v4l2_dev: must be set to the :c:type:`v4l2_device`
+ parent device.
+
+- :c:type:`video_device`->name: set to something descriptive and unique.
+
+- :c:type:`video_device`->vfl_dir: set this to ``VFL_DIR_RX`` for capture
+ devices (``VFL_DIR_RX`` has value 0, so this is normally already the
+ default), set to ``VFL_DIR_TX`` for output devices and ``VFL_DIR_M2M`` for mem2mem (codec) devices.
+
+- :c:type:`video_device`->fops: set to the :c:type:`v4l2_file_operations`
+ struct.
+
+- :c:type:`video_device`->ioctl_ops: if you use the :c:type:`v4l2_ioctl_ops`
+ to simplify ioctl maintenance (highly recommended to use this and it might
+ become compulsory in the future!), then set this to your
+ :c:type:`v4l2_ioctl_ops` struct. The :c:type:`video_device`->vfl_type and
+ :c:type:`video_device`->vfl_dir fields are used to disable ops that do not
+ match the type/dir combination. E.g. VBI ops are disabled for non-VBI nodes,
+ and output ops are disabled for a capture device. This makes it possible to
+ provide just one :c:type:`v4l2_ioctl_ops` struct for both vbi and
+ video nodes.
+
+- :c:type:`video_device`->lock: leave to ``NULL`` if you want to do all the
+ locking in the driver. Otherwise you give it a pointer to a struct
+ ``mutex_lock`` and before the :c:type:`video_device`->unlocked_ioctl
+ file operation is called this lock will be taken by the core and released
+ afterwards. See the next section for more details.
+
+- :c:type:`video_device`->queue: a pointer to the struct vb2_queue
+ associated with this device node.
+ If queue is not ``NULL``, and queue->lock is not ``NULL``, then queue->lock
+ is used for the queuing ioctls (``VIDIOC_REQBUFS``, ``CREATE_BUFS``,
+ ``QBUF``, ``DQBUF``, ``QUERYBUF``, ``PREPARE_BUF``, ``STREAMON`` and
+ ``STREAMOFF``) instead of the lock above.
+ That way the :ref:`vb2 <vb2_framework>` queuing framework does not have
+ to wait for other ioctls. This queue pointer is also used by the
+ :ref:`vb2 <vb2_framework>` helper functions to check for
+ queuing ownership (i.e. is the filehandle calling it allowed to do the
+ operation).
+
+- :c:type:`video_device`->prio: keeps track of the priorities. Used to
+ implement ``VIDIOC_G_PRIORITY`` and ``VIDIOC_S_PRIORITY``.
+ If left to ``NULL``, then it will use the struct v4l2_prio_state
+ in :c:type:`v4l2_device`. If you want to have a separate priority state per
+ (group of) device node(s), then you can point it to your own struct
+ :c:type:`v4l2_prio_state`.
+
+- :c:type:`video_device`->dev_parent: you only set this if v4l2_device was
+ registered with ``NULL`` as the parent ``device`` struct. This only happens
+ in cases where one hardware device has multiple PCI devices that all share
+ the same :c:type:`v4l2_device` core.
+
+ The cx88 driver is an example of this: one core :c:type:`v4l2_device` struct,
+ but it is used by both a raw video PCI device (cx8800) and a MPEG PCI device
+ (cx8802). Since the :c:type:`v4l2_device` cannot be associated with two PCI
+ devices at the same time it is setup without a parent device. But when the
+ struct video_device is initialized you **do** know which parent
+ PCI device to use and so you set ``dev_device`` to the correct PCI device.
+
+If you use :c:type:`v4l2_ioctl_ops`, then you should set
+:c:type:`video_device`->unlocked_ioctl to :c:func:`video_ioctl2` in your
+:c:type:`v4l2_file_operations` struct.
+
+In some cases you want to tell the core that a function you had specified in
+your :c:type:`v4l2_ioctl_ops` should be ignored. You can mark such ioctls by
+calling this function before :c:func:`video_register_device` is called:
+
+ :c:func:`v4l2_disable_ioctl <v4l2_disable_ioctl>`
+ (:c:type:`vdev <video_device>`, cmd).
+
+This tends to be needed if based on external factors (e.g. which card is
+being used) you want to turns off certain features in :c:type:`v4l2_ioctl_ops`
+without having to make a new struct.
+
+The :c:type:`v4l2_file_operations` struct is a subset of file_operations.
+The main difference is that the inode argument is omitted since it is never
+used.
+
+If integration with the media framework is needed, you must initialize the
+:c:type:`media_entity` struct embedded in the :c:type:`video_device` struct
+(entity field) by calling :c:func:`media_entity_pads_init`:
+
+.. code-block:: c
+
+ struct media_pad *pad = &my_vdev->pad;
+ int err;
+
+ err = media_entity_pads_init(&vdev->entity, 1, pad);
+
+The pads array must have been previously initialized. There is no need to
+manually set the struct media_entity type and name fields.
+
+A reference to the entity will be automatically acquired/released when the
+video device is opened/closed.
+
+ioctls and locking
+------------------
+
+The V4L core provides optional locking services. The main service is the
+lock field in struct video_device, which is a pointer to a mutex.
+If you set this pointer, then that will be used by unlocked_ioctl to
+serialize all ioctls.
+
+If you are using the :ref:`videobuf2 framework <vb2_framework>`, then there
+is a second lock that you can set: :c:type:`video_device`->queue->lock. If
+set, then this lock will be used instead of :c:type:`video_device`->lock
+to serialize all queuing ioctls (see the previous section
+for the full list of those ioctls).
+
+The advantage of using a different lock for the queuing ioctls is that for some
+drivers (particularly USB drivers) certain commands such as setting controls
+can take a long time, so you want to use a separate lock for the buffer queuing
+ioctls. That way your ``VIDIOC_DQBUF`` doesn't stall because the driver is busy
+changing the e.g. exposure of the webcam.
+
+Of course, you can always do all the locking yourself by leaving both lock
+pointers at ``NULL``.
+
+If you use the old :ref:`videobuf framework <vb_framework>` then you must
+pass the :c:type:`video_device`->lock to the videobuf queue initialize
+function: if videobuf has to wait for a frame to arrive, then it will
+temporarily unlock the lock and relock it afterwards. If your driver also
+waits in the code, then you should do the same to allow other
+processes to access the device node while the first process is waiting for
+something.
+
+In the case of :ref:`videobuf2 <vb2_framework>` you will need to implement the
+``wait_prepare()`` and ``wait_finish()`` callbacks to unlock/lock if applicable.
+If you use the ``queue->lock`` pointer, then you can use the helper functions
+:c:func:`vb2_ops_wait_prepare` and :c:func:`vb2_ops_wait_finish`.
+
+The implementation of a hotplug disconnect should also take the lock from
+:c:type:`video_device` before calling v4l2_device_disconnect. If you are also
+using :c:type:`video_device`->queue->lock, then you have to first lock
+:c:type:`video_device`->queue->lock followed by :c:type:`video_device`->lock.
+That way you can be sure no ioctl is running when you call
+:c:func:`v4l2_device_disconnect`.
+
+Video device registration
+-------------------------
+
+Next you register the video device with :c:func:`video_register_device`.
+This will create the character device for you.
+
+.. code-block:: c
+
+ err = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
+ if (err) {
+ video_device_release(vdev); /* or kfree(my_vdev); */
+ return err;
+ }
+
+If the :c:type:`v4l2_device` parent device has a not ``NULL`` mdev field,
+the video device entity will be automatically registered with the media
+device.
+
+Which device is registered depends on the type argument. The following
+types exist:
+
+========================== ==================== ==============================
+:c:type:`vfl_devnode_type` Device name Usage
+========================== ==================== ==============================
+``VFL_TYPE_VIDEO`` ``/dev/videoX`` for video input/output devices
+``VFL_TYPE_VBI`` ``/dev/vbiX`` for vertical blank data (i.e.
+ closed captions, teletext)
+``VFL_TYPE_RADIO`` ``/dev/radioX`` for radio tuners
+``VFL_TYPE_SUBDEV`` ``/dev/v4l-subdevX`` for V4L2 subdevices
+``VFL_TYPE_SDR`` ``/dev/swradioX`` for Software Defined Radio
+ (SDR) tuners
+``VFL_TYPE_TOUCH`` ``/dev/v4l-touchX`` for touch sensors
+========================== ==================== ==============================
+
+The last argument gives you a certain amount of control over the device
+node number used (i.e. the X in ``videoX``). Normally you will pass -1
+to let the v4l2 framework pick the first free number. But sometimes users
+want to select a specific node number. It is common that drivers allow
+the user to select a specific device node number through a driver module
+option. That number is then passed to this function and video_register_device
+will attempt to select that device node number. If that number was already
+in use, then the next free device node number will be selected and it
+will send a warning to the kernel log.
+
+Another use-case is if a driver creates many devices. In that case it can
+be useful to place different video devices in separate ranges. For example,
+video capture devices start at 0, video output devices start at 16.
+So you can use the last argument to specify a minimum device node number
+and the v4l2 framework will try to pick the first free number that is equal
+or higher to what you passed. If that fails, then it will just pick the
+first free number.
+
+Since in this case you do not care about a warning about not being able
+to select the specified device node number, you can call the function
+:c:func:`video_register_device_no_warn` instead.
+
+Whenever a device node is created some attributes are also created for you.
+If you look in ``/sys/class/video4linux`` you see the devices. Go into e.g.
+``video0`` and you will see 'name', 'dev_debug' and 'index' attributes. The
+'name' attribute is the 'name' field of the video_device struct. The
+'dev_debug' attribute can be used to enable core debugging. See the next
+section for more detailed information on this.
+
+The 'index' attribute is the index of the device node: for each call to
+:c:func:`video_register_device()` the index is just increased by 1. The
+first video device node you register always starts with index 0.
+
+Users can setup udev rules that utilize the index attribute to make fancy
+device names (e.g. '``mpegX``' for MPEG video capture device nodes).
+
+After the device was successfully registered, then you can use these fields:
+
+- :c:type:`video_device`->vfl_type: the device type passed to
+ :c:func:`video_register_device`.
+- :c:type:`video_device`->minor: the assigned device minor number.
+- :c:type:`video_device`->num: the device node number (i.e. the X in
+ ``videoX``).
+- :c:type:`video_device`->index: the device index number.
+
+If the registration failed, then you need to call
+:c:func:`video_device_release` to free the allocated :c:type:`video_device`
+struct, or free your own struct if the :c:type:`video_device` was embedded in
+it. The ``vdev->release()`` callback will never be called if the registration
+failed, nor should you ever attempt to unregister the device if the
+registration failed.
+
+video device debugging
+----------------------
+
+The 'dev_debug' attribute that is created for each video, vbi, radio or swradio
+device in ``/sys/class/video4linux/<devX>/`` allows you to enable logging of
+file operations.
+
+It is a bitmask and the following bits can be set:
+
+.. tabularcolumns:: |p{5ex}|L|
+
+===== ================================================================
+Mask Description
+===== ================================================================
+0x01 Log the ioctl name and error code. VIDIOC_(D)QBUF ioctls are
+ only logged if bit 0x08 is also set.
+0x02 Log the ioctl name arguments and error code. VIDIOC_(D)QBUF
+ ioctls are
+ only logged if bit 0x08 is also set.
+0x04 Log the file operations open, release, read, write, mmap and
+ get_unmapped_area. The read and write operations are only
+ logged if bit 0x08 is also set.
+0x08 Log the read and write file operations and the VIDIOC_QBUF and
+ VIDIOC_DQBUF ioctls.
+0x10 Log the poll file operation.
+0x20 Log error and messages in the control operations.
+===== ================================================================
+
+Video device cleanup
+--------------------
+
+When the video device nodes have to be removed, either during the unload
+of the driver or because the USB device was disconnected, then you should
+unregister them with:
+
+ :c:func:`video_unregister_device`
+ (:c:type:`vdev <video_device>`);
+
+This will remove the device nodes from sysfs (causing udev to remove them
+from ``/dev``).
+
+After :c:func:`video_unregister_device` returns no new opens can be done.
+However, in the case of USB devices some application might still have one of
+these device nodes open. So after the unregister all file operations (except
+release, of course) will return an error as well.
+
+When the last user of the video device node exits, then the ``vdev->release()``
+callback is called and you can do the final cleanup there.
+
+Don't forget to cleanup the media entity associated with the video device if
+it has been initialized:
+
+ :c:func:`media_entity_cleanup <media_entity_cleanup>`
+ (&vdev->entity);
+
+This can be done from the release callback.
+
+
+helper functions
+----------------
+
+There are a few useful helper functions:
+
+- file and :c:type:`video_device` private data
+
+You can set/get driver private data in the video_device struct using:
+
+ :c:func:`video_get_drvdata <video_get_drvdata>`
+ (:c:type:`vdev <video_device>`);
+
+ :c:func:`video_set_drvdata <video_set_drvdata>`
+ (:c:type:`vdev <video_device>`);
+
+Note that you can safely call :c:func:`video_set_drvdata` before calling
+:c:func:`video_register_device`.
+
+And this function:
+
+ :c:func:`video_devdata <video_devdata>`
+ (struct file \*file);
+
+returns the video_device belonging to the file struct.
+
+The :c:func:`video_devdata` function combines :c:func:`video_get_drvdata`
+with :c:func:`video_devdata`:
+
+ :c:func:`video_drvdata <video_drvdata>`
+ (struct file \*file);
+
+You can go from a :c:type:`video_device` struct to the v4l2_device struct using:
+
+.. code-block:: c
+
+ struct v4l2_device *v4l2_dev = vdev->v4l2_dev;
+
+- Device node name
+
+The :c:type:`video_device` node kernel name can be retrieved using:
+
+ :c:func:`video_device_node_name <video_device_node_name>`
+ (:c:type:`vdev <video_device>`);
+
+The name is used as a hint by userspace tools such as udev. The function
+should be used where possible instead of accessing the video_device::num and
+video_device::minor fields.
+
+video_device functions and data structures
+------------------------------------------
+
+.. kernel-doc:: include/media/v4l2-dev.h
diff --git a/Documentation/driver-api/media/v4l2-device.rst b/Documentation/driver-api/media/v4l2-device.rst
new file mode 100644
index 0000000000..7bd9c45f55
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-device.rst
@@ -0,0 +1,146 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 device instance
+--------------------
+
+Each device instance is represented by a struct v4l2_device.
+Very simple devices can just allocate this struct, but most of the time you
+would embed this struct inside a larger struct.
+
+You must register the device instance by calling:
+
+ :c:func:`v4l2_device_register <v4l2_device_register>`
+ (dev, :c:type:`v4l2_dev <v4l2_device>`).
+
+Registration will initialize the :c:type:`v4l2_device` struct. If the
+dev->driver_data field is ``NULL``, it will be linked to
+:c:type:`v4l2_dev <v4l2_device>` argument.
+
+Drivers that want integration with the media device framework need to set
+dev->driver_data manually to point to the driver-specific device structure
+that embed the struct v4l2_device instance. This is achieved by a
+``dev_set_drvdata()`` call before registering the V4L2 device instance.
+They must also set the struct v4l2_device mdev field to point to a
+properly initialized and registered :c:type:`media_device` instance.
+
+If :c:type:`v4l2_dev <v4l2_device>`\ ->name is empty then it will be set to a
+value derived from dev (driver name followed by the bus_id, to be precise).
+If you set it up before calling :c:func:`v4l2_device_register` then it will
+be untouched. If dev is ``NULL``, then you **must** setup
+:c:type:`v4l2_dev <v4l2_device>`\ ->name before calling
+:c:func:`v4l2_device_register`.
+
+You can use :c:func:`v4l2_device_set_name` to set the name based on a driver
+name and a driver-global atomic_t instance. This will generate names like
+``ivtv0``, ``ivtv1``, etc. If the name ends with a digit, then it will insert
+a dash: ``cx18-0``, ``cx18-1``, etc. This function returns the instance number.
+
+The first ``dev`` argument is normally the ``struct device`` pointer of a
+``pci_dev``, ``usb_interface`` or ``platform_device``. It is rare for dev to
+be ``NULL``, but it happens with ISA devices or when one device creates
+multiple PCI devices, thus making it impossible to associate
+:c:type:`v4l2_dev <v4l2_device>` with a particular parent.
+
+You can also supply a ``notify()`` callback that can be called by sub-devices
+to notify you of events. Whether you need to set this depends on the
+sub-device. Any notifications a sub-device supports must be defined in a header
+in ``include/media/subdevice.h``.
+
+V4L2 devices are unregistered by calling:
+
+ :c:func:`v4l2_device_unregister`
+ (:c:type:`v4l2_dev <v4l2_device>`).
+
+If the dev->driver_data field points to :c:type:`v4l2_dev <v4l2_device>`,
+it will be reset to ``NULL``. Unregistering will also automatically unregister
+all subdevs from the device.
+
+If you have a hotpluggable device (e.g. a USB device), then when a disconnect
+happens the parent device becomes invalid. Since :c:type:`v4l2_device` has a
+pointer to that parent device it has to be cleared as well to mark that the
+parent is gone. To do this call:
+
+ :c:func:`v4l2_device_disconnect`
+ (:c:type:`v4l2_dev <v4l2_device>`).
+
+This does *not* unregister the subdevs, so you still need to call the
+:c:func:`v4l2_device_unregister` function for that. If your driver is not
+hotpluggable, then there is no need to call :c:func:`v4l2_device_disconnect`.
+
+Sometimes you need to iterate over all devices registered by a specific
+driver. This is usually the case if multiple device drivers use the same
+hardware. E.g. the ivtvfb driver is a framebuffer driver that uses the ivtv
+hardware. The same is true for alsa drivers for example.
+
+You can iterate over all registered devices as follows:
+
+.. code-block:: c
+
+ static int callback(struct device *dev, void *p)
+ {
+ struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
+
+ /* test if this device was inited */
+ if (v4l2_dev == NULL)
+ return 0;
+ ...
+ return 0;
+ }
+
+ int iterate(void *p)
+ {
+ struct device_driver *drv;
+ int err;
+
+ /* Find driver 'ivtv' on the PCI bus.
+ pci_bus_type is a global. For USB buses use usb_bus_type. */
+ drv = driver_find("ivtv", &pci_bus_type);
+ /* iterate over all ivtv device instances */
+ err = driver_for_each_device(drv, NULL, p, callback);
+ put_driver(drv);
+ return err;
+ }
+
+Sometimes you need to keep a running counter of the device instance. This is
+commonly used to map a device instance to an index of a module option array.
+
+The recommended approach is as follows:
+
+.. code-block:: c
+
+ static atomic_t drv_instance = ATOMIC_INIT(0);
+
+ static int drv_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
+ {
+ ...
+ state->instance = atomic_inc_return(&drv_instance) - 1;
+ }
+
+If you have multiple device nodes then it can be difficult to know when it is
+safe to unregister :c:type:`v4l2_device` for hotpluggable devices. For this
+purpose :c:type:`v4l2_device` has refcounting support. The refcount is
+increased whenever :c:func:`video_register_device` is called and it is
+decreased whenever that device node is released. When the refcount reaches
+zero, then the :c:type:`v4l2_device` release() callback is called. You can
+do your final cleanup there.
+
+If other device nodes (e.g. ALSA) are created, then you can increase and
+decrease the refcount manually as well by calling:
+
+ :c:func:`v4l2_device_get`
+ (:c:type:`v4l2_dev <v4l2_device>`).
+
+or:
+
+ :c:func:`v4l2_device_put`
+ (:c:type:`v4l2_dev <v4l2_device>`).
+
+Since the initial refcount is 1 you also need to call
+:c:func:`v4l2_device_put` in the ``disconnect()`` callback (for USB devices)
+or in the ``remove()`` callback (for e.g. PCI devices), otherwise the refcount
+will never reach 0.
+
+v4l2_device functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/v4l2-device.h
diff --git a/Documentation/driver-api/media/v4l2-dv-timings.rst b/Documentation/driver-api/media/v4l2-dv-timings.rst
new file mode 100644
index 0000000000..b178f93151
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-dv-timings.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 DV Timings functions
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/v4l2-dv-timings.h
diff --git a/Documentation/driver-api/media/v4l2-event.rst b/Documentation/driver-api/media/v4l2-event.rst
new file mode 100644
index 0000000000..52d4fbc5d8
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-event.rst
@@ -0,0 +1,181 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 events
+-----------
+
+The V4L2 events provide a generic way to pass events to user space.
+The driver must use :c:type:`v4l2_fh` to be able to support V4L2 events.
+
+Events are subscribed per-filehandle. An event specification consists of a
+``type`` and is optionally associated with an object identified through the
+``id`` field. If unused, then the ``id`` is 0. So an event is uniquely
+identified by the ``(type, id)`` tuple.
+
+The :c:type:`v4l2_fh` struct has a list of subscribed events on its
+``subscribed`` field.
+
+When the user subscribes to an event, a :c:type:`v4l2_subscribed_event`
+struct is added to :c:type:`v4l2_fh`\ ``.subscribed``, one for every
+subscribed event.
+
+Each :c:type:`v4l2_subscribed_event` struct ends with a
+:c:type:`v4l2_kevent` ringbuffer, with the size given by the caller
+of :c:func:`v4l2_event_subscribe`. This ringbuffer is used to store any events
+raised by the driver.
+
+So every ``(type, ID)`` event tuple will have its own
+:c:type:`v4l2_kevent` ringbuffer. This guarantees that if a driver is
+generating lots of events of one type in a short time, then that will
+not overwrite events of another type.
+
+But if you get more events of one type than the size of the
+:c:type:`v4l2_kevent` ringbuffer, then the oldest event will be dropped
+and the new one added.
+
+The :c:type:`v4l2_kevent` struct links into the ``available``
+list of the :c:type:`v4l2_fh` struct so :ref:`VIDIOC_DQEVENT` will
+know which event to dequeue first.
+
+Finally, if the event subscription is associated with a particular object
+such as a V4L2 control, then that object needs to know about that as well
+so that an event can be raised by that object. So the ``node`` field can
+be used to link the :c:type:`v4l2_subscribed_event` struct into a list of
+such objects.
+
+So to summarize:
+
+- struct v4l2_fh has two lists: one of the ``subscribed`` events,
+ and one of the ``available`` events.
+
+- struct v4l2_subscribed_event has a ringbuffer of raised
+ (pending) events of that particular type.
+
+- If struct v4l2_subscribed_event is associated with a specific
+ object, then that object will have an internal list of
+ struct v4l2_subscribed_event so it knows who subscribed an
+ event to that object.
+
+Furthermore, the internal struct v4l2_subscribed_event has
+``merge()`` and ``replace()`` callbacks which drivers can set. These
+callbacks are called when a new event is raised and there is no more room.
+
+The ``replace()`` callback allows you to replace the payload of the old event
+with that of the new event, merging any relevant data from the old payload
+into the new payload that replaces it. It is called when this event type has
+a ringbuffer with size is one, i.e. only one event can be stored in the
+ringbuffer.
+
+The ``merge()`` callback allows you to merge the oldest event payload into
+that of the second-oldest event payload. It is called when
+the ringbuffer has size is greater than one.
+
+This way no status information is lost, just the intermediate steps leading
+up to that state.
+
+A good example of these ``replace``/``merge`` callbacks is in v4l2-event.c:
+``ctrls_replace()`` and ``ctrls_merge()`` callbacks for the control event.
+
+.. note::
+ these callbacks can be called from interrupt context, so they must
+ be fast.
+
+In order to queue events to video device, drivers should call:
+
+ :c:func:`v4l2_event_queue <v4l2_event_queue>`
+ (:c:type:`vdev <video_device>`, :c:type:`ev <v4l2_event>`)
+
+The driver's only responsibility is to fill in the type and the data fields.
+The other fields will be filled in by V4L2.
+
+Event subscription
+~~~~~~~~~~~~~~~~~~
+
+Subscribing to an event is via:
+
+ :c:func:`v4l2_event_subscribe <v4l2_event_subscribe>`
+ (:c:type:`fh <v4l2_fh>`, :c:type:`sub <v4l2_event_subscription>` ,
+ elems, :c:type:`ops <v4l2_subscribed_event_ops>`)
+
+
+This function is used to implement :c:type:`video_device`->
+:c:type:`ioctl_ops <v4l2_ioctl_ops>`-> ``vidioc_subscribe_event``,
+but the driver must check first if the driver is able to produce events
+with specified event id, and then should call
+:c:func:`v4l2_event_subscribe` to subscribe the event.
+
+The elems argument is the size of the event queue for this event. If it is 0,
+then the framework will fill in a default value (this depends on the event
+type).
+
+The ops argument allows the driver to specify a number of callbacks:
+
+.. tabularcolumns:: |p{1.5cm}|p{16.0cm}|
+
+======== ==============================================================
+Callback Description
+======== ==============================================================
+add called when a new listener gets added (subscribing to the same
+ event twice will only cause this callback to get called once)
+del called when a listener stops listening
+replace replace event 'old' with event 'new'.
+merge merge event 'old' into event 'new'.
+======== ==============================================================
+
+All 4 callbacks are optional, if you don't want to specify any callbacks
+the ops argument itself maybe ``NULL``.
+
+Unsubscribing an event
+~~~~~~~~~~~~~~~~~~~~~~
+
+Unsubscribing to an event is via:
+
+ :c:func:`v4l2_event_unsubscribe <v4l2_event_unsubscribe>`
+ (:c:type:`fh <v4l2_fh>`, :c:type:`sub <v4l2_event_subscription>`)
+
+This function is used to implement :c:type:`video_device`->
+:c:type:`ioctl_ops <v4l2_ioctl_ops>`-> ``vidioc_unsubscribe_event``.
+A driver may call :c:func:`v4l2_event_unsubscribe` directly unless it
+wants to be involved in unsubscription process.
+
+The special type ``V4L2_EVENT_ALL`` may be used to unsubscribe all events. The
+drivers may want to handle this in a special way.
+
+Check if there's a pending event
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Checking if there's a pending event is via:
+
+ :c:func:`v4l2_event_pending <v4l2_event_pending>`
+ (:c:type:`fh <v4l2_fh>`)
+
+
+This function returns the number of pending events. Useful when implementing
+poll.
+
+How events work
+~~~~~~~~~~~~~~~
+
+Events are delivered to user space through the poll system call. The driver
+can use :c:type:`v4l2_fh`->wait (a wait_queue_head_t) as the argument for
+``poll_wait()``.
+
+There are standard and private events. New standard events must use the
+smallest available event type. The drivers must allocate their events from
+their own class starting from class base. Class base is
+``V4L2_EVENT_PRIVATE_START`` + n * 1000 where n is the lowest available number.
+The first event type in the class is reserved for future use, so the first
+available event type is 'class base + 1'.
+
+An example on how the V4L2 events may be used can be found in the OMAP
+3 ISP driver (``drivers/media/platform/ti/omap3isp``).
+
+A subdev can directly send an event to the :c:type:`v4l2_device` notify
+function with ``V4L2_DEVICE_NOTIFY_EVENT``. This allows the bridge to map
+the subdev that sends the event to the video node(s) associated with the
+subdev that need to be informed about such an event.
+
+V4L2 event functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/v4l2-event.h
+
diff --git a/Documentation/driver-api/media/v4l2-fh.rst b/Documentation/driver-api/media/v4l2-fh.rst
new file mode 100644
index 0000000000..3eeaa8da0c
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-fh.rst
@@ -0,0 +1,141 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 File handlers
+------------------
+
+struct v4l2_fh provides a way to easily keep file handle specific
+data that is used by the V4L2 framework.
+
+.. attention::
+ New drivers must use struct v4l2_fh
+ since it is also used to implement priority handling
+ (:ref:`VIDIOC_G_PRIORITY`).
+
+The users of :c:type:`v4l2_fh` (in the V4L2 framework, not the driver) know
+whether a driver uses :c:type:`v4l2_fh` as its ``file->private_data`` pointer
+by testing the ``V4L2_FL_USES_V4L2_FH`` bit in :c:type:`video_device`->flags.
+This bit is set whenever :c:func:`v4l2_fh_init` is called.
+
+struct v4l2_fh is allocated as a part of the driver's own file handle
+structure and ``file->private_data`` is set to it in the driver's ``open()``
+function by the driver.
+
+In many cases the struct v4l2_fh will be embedded in a larger
+structure. In that case you should call:
+
+#) :c:func:`v4l2_fh_init` and :c:func:`v4l2_fh_add` in ``open()``
+#) :c:func:`v4l2_fh_del` and :c:func:`v4l2_fh_exit` in ``release()``
+
+Drivers can extract their own file handle structure by using the container_of
+macro.
+
+Example:
+
+.. code-block:: c
+
+ struct my_fh {
+ int blah;
+ struct v4l2_fh fh;
+ };
+
+ ...
+
+ int my_open(struct file *file)
+ {
+ struct my_fh *my_fh;
+ struct video_device *vfd;
+ int ret;
+
+ ...
+
+ my_fh = kzalloc(sizeof(*my_fh), GFP_KERNEL);
+
+ ...
+
+ v4l2_fh_init(&my_fh->fh, vfd);
+
+ ...
+
+ file->private_data = &my_fh->fh;
+ v4l2_fh_add(&my_fh->fh);
+ return 0;
+ }
+
+ int my_release(struct file *file)
+ {
+ struct v4l2_fh *fh = file->private_data;
+ struct my_fh *my_fh = container_of(fh, struct my_fh, fh);
+
+ ...
+ v4l2_fh_del(&my_fh->fh);
+ v4l2_fh_exit(&my_fh->fh);
+ kfree(my_fh);
+ return 0;
+ }
+
+Below is a short description of the :c:type:`v4l2_fh` functions used:
+
+:c:func:`v4l2_fh_init <v4l2_fh_init>`
+(:c:type:`fh <v4l2_fh>`, :c:type:`vdev <video_device>`)
+
+
+- Initialise the file handle. This **MUST** be performed in the driver's
+ :c:type:`v4l2_file_operations`->open() handler.
+
+
+:c:func:`v4l2_fh_add <v4l2_fh_add>`
+(:c:type:`fh <v4l2_fh>`)
+
+- Add a :c:type:`v4l2_fh` to :c:type:`video_device` file handle list.
+ Must be called once the file handle is completely initialized.
+
+:c:func:`v4l2_fh_del <v4l2_fh_del>`
+(:c:type:`fh <v4l2_fh>`)
+
+- Unassociate the file handle from :c:type:`video_device`. The file handle
+ exit function may now be called.
+
+:c:func:`v4l2_fh_exit <v4l2_fh_exit>`
+(:c:type:`fh <v4l2_fh>`)
+
+- Uninitialise the file handle. After uninitialisation the :c:type:`v4l2_fh`
+ memory can be freed.
+
+
+If struct v4l2_fh is not embedded, then you can use these helper functions:
+
+:c:func:`v4l2_fh_open <v4l2_fh_open>`
+(struct file \*filp)
+
+- This allocates a struct v4l2_fh, initializes it and adds it to
+ the struct video_device associated with the file struct.
+
+:c:func:`v4l2_fh_release <v4l2_fh_release>`
+(struct file \*filp)
+
+- This deletes it from the struct video_device associated with the
+ file struct, uninitialised the :c:type:`v4l2_fh` and frees it.
+
+These two functions can be plugged into the v4l2_file_operation's ``open()``
+and ``release()`` ops.
+
+Several drivers need to do something when the first file handle is opened and
+when the last file handle closes. Two helper functions were added to check
+whether the :c:type:`v4l2_fh` struct is the only open filehandle of the
+associated device node:
+
+:c:func:`v4l2_fh_is_singular <v4l2_fh_is_singular>`
+(:c:type:`fh <v4l2_fh>`)
+
+- Returns 1 if the file handle is the only open file handle, else 0.
+
+:c:func:`v4l2_fh_is_singular_file <v4l2_fh_is_singular_file>`
+(struct file \*filp)
+
+- Same, but it calls v4l2_fh_is_singular with filp->private_data.
+
+
+V4L2 fh functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/v4l2-fh.h
diff --git a/Documentation/driver-api/media/v4l2-flash-led-class.rst b/Documentation/driver-api/media/v4l2-flash-led-class.rst
new file mode 100644
index 0000000000..2aa6bed9b8
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-flash-led-class.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 flash functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/v4l2-flash-led-class.h
diff --git a/Documentation/driver-api/media/v4l2-fwnode.rst b/Documentation/driver-api/media/v4l2-fwnode.rst
new file mode 100644
index 0000000000..e313b6cddc
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-fwnode.rst
@@ -0,0 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 fwnode kAPI
+^^^^^^^^^^^^^^^^
+.. kernel-doc:: include/media/v4l2-fwnode.h
diff --git a/Documentation/driver-api/media/v4l2-intro.rst b/Documentation/driver-api/media/v4l2-intro.rst
new file mode 100644
index 0000000000..4d54fa9d7a
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-intro.rst
@@ -0,0 +1,76 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Introduction
+------------
+
+The V4L2 drivers tend to be very complex due to the complexity of the
+hardware: most devices have multiple ICs, export multiple device nodes in
+/dev, and create also non-V4L2 devices such as DVB, ALSA, FB, I2C and input
+(IR) devices.
+
+Especially the fact that V4L2 drivers have to setup supporting ICs to
+do audio/video muxing/encoding/decoding makes it more complex than most.
+Usually these ICs are connected to the main bridge driver through one or
+more I2C buses, but other buses can also be used. Such devices are
+called 'sub-devices'.
+
+For a long time the framework was limited to the video_device struct for
+creating V4L device nodes and video_buf for handling the video buffers
+(note that this document does not discuss the video_buf framework).
+
+This meant that all drivers had to do the setup of device instances and
+connecting to sub-devices themselves. Some of this is quite complicated
+to do right and many drivers never did do it correctly.
+
+There is also a lot of common code that could never be refactored due to
+the lack of a framework.
+
+So this framework sets up the basic building blocks that all drivers
+need and this same framework should make it much easier to refactor
+common code into utility functions shared by all drivers.
+
+A good example to look at as a reference is the v4l2-pci-skeleton.c
+source that is available in samples/v4l/. It is a skeleton driver for
+a PCI capture card, and demonstrates how to use the V4L2 driver
+framework. It can be used as a template for real PCI video capture driver.
+
+Structure of a V4L driver
+-------------------------
+
+All drivers have the following structure:
+
+1) A struct for each device instance containing the device state.
+
+2) A way of initializing and commanding sub-devices (if any).
+
+3) Creating V4L2 device nodes (/dev/videoX, /dev/vbiX and /dev/radioX)
+ and keeping track of device-node specific data.
+
+4) Filehandle-specific structs containing per-filehandle data;
+
+5) video buffer handling.
+
+This is a rough schematic of how it all relates:
+
+.. code-block:: none
+
+ device instances
+ |
+ +-sub-device instances
+ |
+ \-V4L2 device nodes
+ |
+ \-filehandle instances
+
+
+Structure of the V4L2 framework
+-------------------------------
+
+The framework closely resembles the driver structure: it has a v4l2_device
+struct for the device instance data, a v4l2_subdev struct to refer to
+sub-device instances, the video_device struct stores V4L2 device node data
+and the v4l2_fh struct keeps track of filehandle instances.
+
+The V4L2 framework also optionally integrates with the media framework. If a
+driver sets the struct v4l2_device mdev field, sub-devices and video nodes
+will automatically appear in the media framework as entities.
diff --git a/Documentation/driver-api/media/v4l2-mc.rst b/Documentation/driver-api/media/v4l2-mc.rst
new file mode 100644
index 0000000000..0c352ac588
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-mc.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 Media Controller functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/v4l2-mc.h
diff --git a/Documentation/driver-api/media/v4l2-mediabus.rst b/Documentation/driver-api/media/v4l2-mediabus.rst
new file mode 100644
index 0000000000..1f2254cba9
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-mediabus.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 Media Bus functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/v4l2-mediabus.h
diff --git a/Documentation/driver-api/media/v4l2-mem2mem.rst b/Documentation/driver-api/media/v4l2-mem2mem.rst
new file mode 100644
index 0000000000..a43b31cc82
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-mem2mem.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 Memory to Memory functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/v4l2-mem2mem.h
diff --git a/Documentation/driver-api/media/v4l2-rect.rst b/Documentation/driver-api/media/v4l2-rect.rst
new file mode 100644
index 0000000000..fc315cd841
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-rect.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 rect helper functions
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/v4l2-rect.h
diff --git a/Documentation/driver-api/media/v4l2-subdev.rst b/Documentation/driver-api/media/v4l2-subdev.rst
new file mode 100644
index 0000000000..e56b50b3f2
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-subdev.rst
@@ -0,0 +1,637 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 sub-devices
+----------------
+
+Many drivers need to communicate with sub-devices. These devices can do all
+sort of tasks, but most commonly they handle audio and/or video muxing,
+encoding or decoding. For webcams common sub-devices are sensors and camera
+controllers.
+
+Usually these are I2C devices, but not necessarily. In order to provide the
+driver with a consistent interface to these sub-devices the
+:c:type:`v4l2_subdev` struct (v4l2-subdev.h) was created.
+
+Each sub-device driver must have a :c:type:`v4l2_subdev` struct. This struct
+can be stand-alone for simple sub-devices or it might be embedded in a larger
+struct if more state information needs to be stored. Usually there is a
+low-level device struct (e.g. ``i2c_client``) that contains the device data as
+setup by the kernel. It is recommended to store that pointer in the private
+data of :c:type:`v4l2_subdev` using :c:func:`v4l2_set_subdevdata`. That makes
+it easy to go from a :c:type:`v4l2_subdev` to the actual low-level bus-specific
+device data.
+
+You also need a way to go from the low-level struct to :c:type:`v4l2_subdev`.
+For the common i2c_client struct the i2c_set_clientdata() call is used to store
+a :c:type:`v4l2_subdev` pointer, for other buses you may have to use other
+methods.
+
+Bridges might also need to store per-subdev private data, such as a pointer to
+bridge-specific per-subdev private data. The :c:type:`v4l2_subdev` structure
+provides host private data for that purpose that can be accessed with
+:c:func:`v4l2_get_subdev_hostdata` and :c:func:`v4l2_set_subdev_hostdata`.
+
+From the bridge driver perspective, you load the sub-device module and somehow
+obtain the :c:type:`v4l2_subdev` pointer. For i2c devices this is easy: you call
+``i2c_get_clientdata()``. For other buses something similar needs to be done.
+Helper functions exist for sub-devices on an I2C bus that do most of this
+tricky work for you.
+
+Each :c:type:`v4l2_subdev` contains function pointers that sub-device drivers
+can implement (or leave ``NULL`` if it is not applicable). Since sub-devices can
+do so many different things and you do not want to end up with a huge ops struct
+of which only a handful of ops are commonly implemented, the function pointers
+are sorted according to category and each category has its own ops struct.
+
+The top-level ops struct contains pointers to the category ops structs, which
+may be NULL if the subdev driver does not support anything from that category.
+
+It looks like this:
+
+.. code-block:: c
+
+ struct v4l2_subdev_core_ops {
+ int (*log_status)(struct v4l2_subdev *sd);
+ int (*init)(struct v4l2_subdev *sd, u32 val);
+ ...
+ };
+
+ struct v4l2_subdev_tuner_ops {
+ ...
+ };
+
+ struct v4l2_subdev_audio_ops {
+ ...
+ };
+
+ struct v4l2_subdev_video_ops {
+ ...
+ };
+
+ struct v4l2_subdev_pad_ops {
+ ...
+ };
+
+ struct v4l2_subdev_ops {
+ const struct v4l2_subdev_core_ops *core;
+ const struct v4l2_subdev_tuner_ops *tuner;
+ const struct v4l2_subdev_audio_ops *audio;
+ const struct v4l2_subdev_video_ops *video;
+ const struct v4l2_subdev_pad_ops *video;
+ };
+
+The core ops are common to all subdevs, the other categories are implemented
+depending on the sub-device. E.g. a video device is unlikely to support the
+audio ops and vice versa.
+
+This setup limits the number of function pointers while still making it easy
+to add new ops and categories.
+
+A sub-device driver initializes the :c:type:`v4l2_subdev` struct using:
+
+ :c:func:`v4l2_subdev_init <v4l2_subdev_init>`
+ (:c:type:`sd <v4l2_subdev>`, &\ :c:type:`ops <v4l2_subdev_ops>`).
+
+
+Afterwards you need to initialize :c:type:`sd <v4l2_subdev>`->name with a
+unique name and set the module owner. This is done for you if you use the
+i2c helper functions.
+
+If integration with the media framework is needed, you must initialize the
+:c:type:`media_entity` struct embedded in the :c:type:`v4l2_subdev` struct
+(entity field) by calling :c:func:`media_entity_pads_init`, if the entity has
+pads:
+
+.. code-block:: c
+
+ struct media_pad *pads = &my_sd->pads;
+ int err;
+
+ err = media_entity_pads_init(&sd->entity, npads, pads);
+
+The pads array must have been previously initialized. There is no need to
+manually set the struct media_entity function and name fields, but the
+revision field must be initialized if needed.
+
+A reference to the entity will be automatically acquired/released when the
+subdev device node (if any) is opened/closed.
+
+Don't forget to cleanup the media entity before the sub-device is destroyed:
+
+.. code-block:: c
+
+ media_entity_cleanup(&sd->entity);
+
+If a sub-device driver implements sink pads, the subdev driver may set the
+link_validate field in :c:type:`v4l2_subdev_pad_ops` to provide its own link
+validation function. For every link in the pipeline, the link_validate pad
+operation of the sink end of the link is called. In both cases the driver is
+still responsible for validating the correctness of the format configuration
+between sub-devices and video nodes.
+
+If link_validate op is not set, the default function
+:c:func:`v4l2_subdev_link_validate_default` is used instead. This function
+ensures that width, height and the media bus pixel code are equal on both source
+and sink of the link. Subdev drivers are also free to use this function to
+perform the checks mentioned above in addition to their own checks.
+
+Subdev registration
+~~~~~~~~~~~~~~~~~~~
+
+There are currently two ways to register subdevices with the V4L2 core. The
+first (traditional) possibility is to have subdevices registered by bridge
+drivers. This can be done when the bridge driver has the complete information
+about subdevices connected to it and knows exactly when to register them. This
+is typically the case for internal subdevices, like video data processing units
+within SoCs or complex PCI(e) boards, camera sensors in USB cameras or connected
+to SoCs, which pass information about them to bridge drivers, usually in their
+platform data.
+
+There are however also situations where subdevices have to be registered
+asynchronously to bridge devices. An example of such a configuration is a Device
+Tree based system where information about subdevices is made available to the
+system independently from the bridge devices, e.g. when subdevices are defined
+in DT as I2C device nodes. The API used in this second case is described further
+below.
+
+Using one or the other registration method only affects the probing process, the
+run-time bridge-subdevice interaction is in both cases the same.
+
+Registering synchronous sub-devices
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+In the **synchronous** case a device (bridge) driver needs to register the
+:c:type:`v4l2_subdev` with the v4l2_device:
+
+ :c:func:`v4l2_device_register_subdev <v4l2_device_register_subdev>`
+ (:c:type:`v4l2_dev <v4l2_device>`, :c:type:`sd <v4l2_subdev>`).
+
+This can fail if the subdev module disappeared before it could be registered.
+After this function was called successfully the subdev->dev field points to
+the :c:type:`v4l2_device`.
+
+If the v4l2_device parent device has a non-NULL mdev field, the sub-device
+entity will be automatically registered with the media device.
+
+You can unregister a sub-device using:
+
+ :c:func:`v4l2_device_unregister_subdev <v4l2_device_unregister_subdev>`
+ (:c:type:`sd <v4l2_subdev>`).
+
+Afterwards the subdev module can be unloaded and
+:c:type:`sd <v4l2_subdev>`->dev == ``NULL``.
+
+Registering asynchronous sub-devices
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+In the **asynchronous** case subdevice probing can be invoked independently of
+the bridge driver availability. The subdevice driver then has to verify whether
+all the requirements for a successful probing are satisfied. This can include a
+check for a master clock availability. If any of the conditions aren't satisfied
+the driver might decide to return ``-EPROBE_DEFER`` to request further reprobing
+attempts. Once all conditions are met the subdevice shall be registered using
+the :c:func:`v4l2_async_register_subdev` function. Unregistration is
+performed using the :c:func:`v4l2_async_unregister_subdev` call. Subdevices
+registered this way are stored in a global list of subdevices, ready to be
+picked up by bridge drivers.
+
+Asynchronous sub-device notifiers
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Bridge drivers in turn have to register a notifier object. This is performed
+using the :c:func:`v4l2_async_nf_register` call. To unregister the notifier the
+driver has to call :c:func:`v4l2_async_nf_unregister`. Before releasing memory
+of an unregister notifier, it must be cleaned up by calling
+:c:func:`v4l2_async_nf_cleanup`.
+
+Before registering the notifier, bridge drivers must do two things: first, the
+notifier must be initialized using the :c:func:`v4l2_async_nf_init`. Second,
+bridge drivers can then begin to form a list of async connection descriptors
+that the bridge device needs for its
+operation. :c:func:`v4l2_async_nf_add_fwnode`,
+:c:func:`v4l2_async_nf_add_fwnode_remote` and :c:func:`v4l2_async_nf_add_i2c`
+
+Async connection descriptors describe connections to external sub-devices the
+drivers for which are not yet probed. Based on an async connection, a media data
+or ancillary link may be created when the related sub-device becomes
+available. There may be one or more async connections to a given sub-device but
+this is not known at the time of adding the connections to the notifier. Async
+connections are bound as matching async sub-devices are found, one by one.
+
+Asynchronous sub-device notifier for sub-devices
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+A driver that registers an asynchronous sub-device may also register an
+asynchronous notifier. This is called an asynchronous sub-device notifier andthe
+process is similar to that of a bridge driver apart from that the notifier is
+initialised using :c:func:`v4l2_async_subdev_nf_init` instead. A sub-device
+notifier may complete only after the V4L2 device becomes available, i.e. there's
+a path via async sub-devices and notifiers to a notifier that is not an
+asynchronous sub-device notifier.
+
+Asynchronous sub-device registration helper for camera sensor drivers
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+:c:func:`v4l2_async_register_subdev_sensor` is a helper function for sensor
+drivers registering their own async connection, but it also registers a notifier
+and further registers async connections for lens and flash devices found in
+firmware. The notifier for the sub-device is unregistered and cleaned up with
+the async sub-device, using :c:func:`v4l2_async_unregister_subdev`.
+
+Asynchronous sub-device notifier example
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+These functions allocate an async connection descriptor which is of type struct
+:c:type:`v4l2_async_connection` embedded in a driver-specific struct. The &struct
+:c:type:`v4l2_async_connection` shall be the first member of this struct:
+
+.. code-block:: c
+
+ struct my_async_connection {
+ struct v4l2_async_connection asc;
+ ...
+ };
+
+ struct my_async_connection *my_asc;
+ struct fwnode_handle *ep;
+
+ ...
+
+ my_asc = v4l2_async_nf_add_fwnode_remote(&notifier, ep,
+ struct my_async_connection);
+ fwnode_handle_put(ep);
+
+ if (IS_ERR(my_asc))
+ return PTR_ERR(my_asc);
+
+Asynchronous sub-device notifier callbacks
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The V4L2 core will then use these connection descriptors to match asynchronously
+registered subdevices to them. If a match is detected the ``.bound()`` notifier
+callback is called. After all connections have been bound the .complete()
+callback is called. When a connection is removed from the system the
+``.unbind()`` method is called. All three callbacks are optional.
+
+Drivers can store any type of custom data in their driver-specific
+:c:type:`v4l2_async_connection` wrapper. If any of that data requires special
+handling when the structure is freed, drivers must implement the ``.destroy()``
+notifier callback. The framework will call it right before freeing the
+:c:type:`v4l2_async_connection`.
+
+Calling subdev operations
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The advantage of using :c:type:`v4l2_subdev` is that it is a generic struct and
+does not contain any knowledge about the underlying hardware. So a driver might
+contain several subdevs that use an I2C bus, but also a subdev that is
+controlled through GPIO pins. This distinction is only relevant when setting
+up the device, but once the subdev is registered it is completely transparent.
+
+Once the subdev has been registered you can call an ops function either
+directly:
+
+.. code-block:: c
+
+ err = sd->ops->core->g_std(sd, &norm);
+
+but it is better and easier to use this macro:
+
+.. code-block:: c
+
+ err = v4l2_subdev_call(sd, core, g_std, &norm);
+
+The macro will do the right ``NULL`` pointer checks and returns ``-ENODEV``
+if :c:type:`sd <v4l2_subdev>` is ``NULL``, ``-ENOIOCTLCMD`` if either
+:c:type:`sd <v4l2_subdev>`->core or :c:type:`sd <v4l2_subdev>`->core->g_std is ``NULL``, or the actual result of the
+:c:type:`sd <v4l2_subdev>`->ops->core->g_std ops.
+
+It is also possible to call all or a subset of the sub-devices:
+
+.. code-block:: c
+
+ v4l2_device_call_all(v4l2_dev, 0, core, g_std, &norm);
+
+Any subdev that does not support this ops is skipped and error results are
+ignored. If you want to check for errors use this:
+
+.. code-block:: c
+
+ err = v4l2_device_call_until_err(v4l2_dev, 0, core, g_std, &norm);
+
+Any error except ``-ENOIOCTLCMD`` will exit the loop with that error. If no
+errors (except ``-ENOIOCTLCMD``) occurred, then 0 is returned.
+
+The second argument to both calls is a group ID. If 0, then all subdevs are
+called. If non-zero, then only those whose group ID match that value will
+be called. Before a bridge driver registers a subdev it can set
+:c:type:`sd <v4l2_subdev>`->grp_id to whatever value it wants (it's 0 by
+default). This value is owned by the bridge driver and the sub-device driver
+will never modify or use it.
+
+The group ID gives the bridge driver more control how callbacks are called.
+For example, there may be multiple audio chips on a board, each capable of
+changing the volume. But usually only one will actually be used when the
+user want to change the volume. You can set the group ID for that subdev to
+e.g. AUDIO_CONTROLLER and specify that as the group ID value when calling
+``v4l2_device_call_all()``. That ensures that it will only go to the subdev
+that needs it.
+
+If the sub-device needs to notify its v4l2_device parent of an event, then
+it can call ``v4l2_subdev_notify(sd, notification, arg)``. This macro checks
+whether there is a ``notify()`` callback defined and returns ``-ENODEV`` if not.
+Otherwise the result of the ``notify()`` call is returned.
+
+V4L2 sub-device userspace API
+-----------------------------
+
+Bridge drivers traditionally expose one or multiple video nodes to userspace,
+and control subdevices through the :c:type:`v4l2_subdev_ops` operations in
+response to video node operations. This hides the complexity of the underlying
+hardware from applications. For complex devices, finer-grained control of the
+device than what the video nodes offer may be required. In those cases, bridge
+drivers that implement :ref:`the media controller API <media_controller>` may
+opt for making the subdevice operations directly accessible from userspace.
+
+Device nodes named ``v4l-subdev``\ *X* can be created in ``/dev`` to access
+sub-devices directly. If a sub-device supports direct userspace configuration
+it must set the ``V4L2_SUBDEV_FL_HAS_DEVNODE`` flag before being registered.
+
+After registering sub-devices, the :c:type:`v4l2_device` driver can create
+device nodes for all registered sub-devices marked with
+``V4L2_SUBDEV_FL_HAS_DEVNODE`` by calling
+:c:func:`v4l2_device_register_subdev_nodes`. Those device nodes will be
+automatically removed when sub-devices are unregistered.
+
+The device node handles a subset of the V4L2 API.
+
+``VIDIOC_QUERYCTRL``,
+``VIDIOC_QUERYMENU``,
+``VIDIOC_G_CTRL``,
+``VIDIOC_S_CTRL``,
+``VIDIOC_G_EXT_CTRLS``,
+``VIDIOC_S_EXT_CTRLS`` and
+``VIDIOC_TRY_EXT_CTRLS``:
+
+ The controls ioctls are identical to the ones defined in V4L2. They
+ behave identically, with the only exception that they deal only with
+ controls implemented in the sub-device. Depending on the driver, those
+ controls can be also be accessed through one (or several) V4L2 device
+ nodes.
+
+``VIDIOC_DQEVENT``,
+``VIDIOC_SUBSCRIBE_EVENT`` and
+``VIDIOC_UNSUBSCRIBE_EVENT``
+
+ The events ioctls are identical to the ones defined in V4L2. They
+ behave identically, with the only exception that they deal only with
+ events generated by the sub-device. Depending on the driver, those
+ events can also be reported by one (or several) V4L2 device nodes.
+
+ Sub-device drivers that want to use events need to set the
+ ``V4L2_SUBDEV_FL_HAS_EVENTS`` :c:type:`v4l2_subdev`.flags before registering
+ the sub-device. After registration events can be queued as usual on the
+ :c:type:`v4l2_subdev`.devnode device node.
+
+ To properly support events, the ``poll()`` file operation is also
+ implemented.
+
+Private ioctls
+
+ All ioctls not in the above list are passed directly to the sub-device
+ driver through the core::ioctl operation.
+
+Read-only sub-device userspace API
+----------------------------------
+
+Bridge drivers that control their connected subdevices through direct calls to
+the kernel API realized by :c:type:`v4l2_subdev_ops` structure do not usually
+want userspace to be able to change the same parameters through the subdevice
+device node and thus do not usually register any.
+
+It is sometimes useful to report to userspace the current subdevice
+configuration through a read-only API, that does not permit applications to
+change to the device parameters but allows interfacing to the subdevice device
+node to inspect them.
+
+For instance, to implement cameras based on computational photography, userspace
+needs to know the detailed camera sensor configuration (in terms of skipping,
+binning, cropping and scaling) for each supported output resolution. To support
+such use cases, bridge drivers may expose the subdevice operations to userspace
+through a read-only API.
+
+To create a read-only device node for all the subdevices registered with the
+``V4L2_SUBDEV_FL_HAS_DEVNODE`` set, the :c:type:`v4l2_device` driver should call
+:c:func:`v4l2_device_register_ro_subdev_nodes`.
+
+Access to the following ioctls for userspace applications is restricted on
+sub-device device nodes registered with
+:c:func:`v4l2_device_register_ro_subdev_nodes`.
+
+``VIDIOC_SUBDEV_S_FMT``,
+``VIDIOC_SUBDEV_S_CROP``,
+``VIDIOC_SUBDEV_S_SELECTION``:
+
+ These ioctls are only allowed on a read-only subdevice device node
+ for the :ref:`V4L2_SUBDEV_FORMAT_TRY <v4l2-subdev-format-whence>`
+ formats and selection rectangles.
+
+``VIDIOC_SUBDEV_S_FRAME_INTERVAL``,
+``VIDIOC_SUBDEV_S_DV_TIMINGS``,
+``VIDIOC_SUBDEV_S_STD``:
+
+ These ioctls are not allowed on a read-only subdevice node.
+
+In case the ioctl is not allowed, or the format to modify is set to
+``V4L2_SUBDEV_FORMAT_ACTIVE``, the core returns a negative error code and
+the errno variable is set to ``-EPERM``.
+
+I2C sub-device drivers
+----------------------
+
+Since these drivers are so common, special helper functions are available to
+ease the use of these drivers (``v4l2-common.h``).
+
+The recommended method of adding :c:type:`v4l2_subdev` support to an I2C driver
+is to embed the :c:type:`v4l2_subdev` struct into the state struct that is
+created for each I2C device instance. Very simple devices have no state
+struct and in that case you can just create a :c:type:`v4l2_subdev` directly.
+
+A typical state struct would look like this (where 'chipname' is replaced by
+the name of the chip):
+
+.. code-block:: c
+
+ struct chipname_state {
+ struct v4l2_subdev sd;
+ ... /* additional state fields */
+ };
+
+Initialize the :c:type:`v4l2_subdev` struct as follows:
+
+.. code-block:: c
+
+ v4l2_i2c_subdev_init(&state->sd, client, subdev_ops);
+
+This function will fill in all the fields of :c:type:`v4l2_subdev` ensure that
+the :c:type:`v4l2_subdev` and i2c_client both point to one another.
+
+You should also add a helper inline function to go from a :c:type:`v4l2_subdev`
+pointer to a chipname_state struct:
+
+.. code-block:: c
+
+ static inline struct chipname_state *to_state(struct v4l2_subdev *sd)
+ {
+ return container_of(sd, struct chipname_state, sd);
+ }
+
+Use this to go from the :c:type:`v4l2_subdev` struct to the ``i2c_client``
+struct:
+
+.. code-block:: c
+
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+And this to go from an ``i2c_client`` to a :c:type:`v4l2_subdev` struct:
+
+.. code-block:: c
+
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+Make sure to call
+:c:func:`v4l2_device_unregister_subdev`\ (:c:type:`sd <v4l2_subdev>`)
+when the ``remove()`` callback is called. This will unregister the sub-device
+from the bridge driver. It is safe to call this even if the sub-device was
+never registered.
+
+You need to do this because when the bridge driver destroys the i2c adapter
+the ``remove()`` callbacks are called of the i2c devices on that adapter.
+After that the corresponding v4l2_subdev structures are invalid, so they
+have to be unregistered first. Calling
+:c:func:`v4l2_device_unregister_subdev`\ (:c:type:`sd <v4l2_subdev>`)
+from the ``remove()`` callback ensures that this is always done correctly.
+
+
+The bridge driver also has some helper functions it can use:
+
+.. code-block:: c
+
+ struct v4l2_subdev *sd = v4l2_i2c_new_subdev(v4l2_dev, adapter,
+ "module_foo", "chipid", 0x36, NULL);
+
+This loads the given module (can be ``NULL`` if no module needs to be loaded)
+and calls :c:func:`i2c_new_client_device` with the given ``i2c_adapter`` and
+chip/address arguments. If all goes well, then it registers the subdev with
+the v4l2_device.
+
+You can also use the last argument of :c:func:`v4l2_i2c_new_subdev` to pass
+an array of possible I2C addresses that it should probe. These probe addresses
+are only used if the previous argument is 0. A non-zero argument means that you
+know the exact i2c address so in that case no probing will take place.
+
+Both functions return ``NULL`` if something went wrong.
+
+Note that the chipid you pass to :c:func:`v4l2_i2c_new_subdev` is usually
+the same as the module name. It allows you to specify a chip variant, e.g.
+"saa7114" or "saa7115". In general though the i2c driver autodetects this.
+The use of chipid is something that needs to be looked at more closely at a
+later date. It differs between i2c drivers and as such can be confusing.
+To see which chip variants are supported you can look in the i2c driver code
+for the i2c_device_id table. This lists all the possibilities.
+
+There are one more helper function:
+
+:c:func:`v4l2_i2c_new_subdev_board` uses an :c:type:`i2c_board_info` struct
+which is passed to the i2c driver and replaces the irq, platform_data and addr
+arguments.
+
+If the subdev supports the s_config core ops, then that op is called with
+the irq and platform_data arguments after the subdev was setup.
+
+The :c:func:`v4l2_i2c_new_subdev` function will call
+:c:func:`v4l2_i2c_new_subdev_board`, internally filling a
+:c:type:`i2c_board_info` structure using the ``client_type`` and the
+``addr`` to fill it.
+
+Centrally managed subdev active state
+-------------------------------------
+
+Traditionally V4L2 subdev drivers maintained internal state for the active
+device configuration. This is often implemented as e.g. an array of struct
+v4l2_mbus_framefmt, one entry for each pad, and similarly for crop and compose
+rectangles.
+
+In addition to the active configuration, each subdev file handle has an array of
+struct v4l2_subdev_pad_config, managed by the V4L2 core, which contains the try
+configuration.
+
+To simplify the subdev drivers the V4L2 subdev API now optionally supports a
+centrally managed active configuration represented by
+:c:type:`v4l2_subdev_state`. One instance of state, which contains the active
+device configuration, is stored in the sub-device itself as part of
+the :c:type:`v4l2_subdev` structure, while the core associates a try state to
+each open file handle, to store the try configuration related to that file
+handle.
+
+Sub-device drivers can opt-in and use state to manage their active configuration
+by initializing the subdevice state with a call to v4l2_subdev_init_finalize()
+before registering the sub-device. They must also call v4l2_subdev_cleanup()
+to release all the allocated resources before unregistering the sub-device.
+The core automatically allocates and initializes a state for each open file
+handle to store the try configurations and frees it when closing the file
+handle.
+
+V4L2 sub-device operations that use both the :ref:`ACTIVE and TRY formats
+<v4l2-subdev-format-whence>` receive the correct state to operate on through
+the 'state' parameter. The state must be locked and unlocked by the
+caller by calling :c:func:`v4l2_subdev_lock_state()` and
+:c:func:`v4l2_subdev_unlock_state()`. The caller can do so by calling the subdev
+operation through the :c:func:`v4l2_subdev_call_state_active()` macro.
+
+Operations that do not receive a state parameter implicitly operate on the
+subdevice active state, which drivers can exclusively access by
+calling :c:func:`v4l2_subdev_lock_and_get_active_state()`. The sub-device active
+state must equally be released by calling :c:func:`v4l2_subdev_unlock_state()`.
+
+Drivers must never manually access the state stored in the :c:type:`v4l2_subdev`
+or in the file handle without going through the designated helpers.
+
+While the V4L2 core passes the correct try or active state to the subdevice
+operations, many existing device drivers pass a NULL state when calling
+operations with :c:func:`v4l2_subdev_call()`. This legacy construct causes
+issues with subdevice drivers that let the V4L2 core manage the active state,
+as they expect to receive the appropriate state as a parameter. To help the
+conversion of subdevice drivers to a managed active state without having to
+convert all callers at the same time, an additional wrapper layer has been
+added to v4l2_subdev_call(), which handles the NULL case by getting and locking
+the callee's active state with :c:func:`v4l2_subdev_lock_and_get_active_state()`,
+and unlocking the state after the call.
+
+The whole subdev state is in reality split into three parts: the
+v4l2_subdev_state, subdev controls and subdev driver's internal state. In the
+future these parts should be combined into a single state. For the time being
+we need a way to handle the locking for these parts. This can be accomplished
+by sharing a lock. The v4l2_ctrl_handler already supports this via its 'lock'
+pointer and the same model is used with states. The driver can do the following
+before calling v4l2_subdev_init_finalize():
+
+.. code-block:: c
+
+ sd->ctrl_handler->lock = &priv->mutex;
+ sd->state_lock = &priv->mutex;
+
+This shares the driver's private mutex between the controls and the states.
+
+Streams, multiplexed media pads and internal routing
+----------------------------------------------------
+
+A subdevice driver can implement support for multiplexed streams by setting
+the V4L2_SUBDEV_FL_STREAMS subdev flag and implementing support for
+centrally managed subdev active state, routing and stream based
+configuration.
+
+V4L2 sub-device functions and data structures
+---------------------------------------------
+
+.. kernel-doc:: include/media/v4l2-subdev.h
diff --git a/Documentation/driver-api/media/v4l2-tuner.rst b/Documentation/driver-api/media/v4l2-tuner.rst
new file mode 100644
index 0000000000..e6caa33215
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-tuner.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Tuner functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/tuner.h
+
+.. kernel-doc:: include/media/tuner-types.h
diff --git a/Documentation/driver-api/media/v4l2-tveeprom.rst b/Documentation/driver-api/media/v4l2-tveeprom.rst
new file mode 100644
index 0000000000..43fb391eda
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-tveeprom.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Hauppauge TV EEPROM functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/tveeprom.h
diff --git a/Documentation/driver-api/media/v4l2-videobuf.rst b/Documentation/driver-api/media/v4l2-videobuf.rst
new file mode 100644
index 0000000000..4b1d84eefe
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-videobuf.rst
@@ -0,0 +1,403 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. _vb_framework:
+
+Videobuf Framework
+==================
+
+Author: Jonathan Corbet <corbet@lwn.net>
+
+Current as of 2.6.33
+
+.. note::
+
+ The videobuf framework was deprecated in favor of videobuf2. Shouldn't
+ be used on new drivers.
+
+Introduction
+------------
+
+The videobuf layer functions as a sort of glue layer between a V4L2 driver
+and user space. It handles the allocation and management of buffers for
+the storage of video frames. There is a set of functions which can be used
+to implement many of the standard POSIX I/O system calls, including read(),
+poll(), and, happily, mmap(). Another set of functions can be used to
+implement the bulk of the V4L2 ioctl() calls related to streaming I/O,
+including buffer allocation, queueing and dequeueing, and streaming
+control. Using videobuf imposes a few design decisions on the driver
+author, but the payback comes in the form of reduced code in the driver and
+a consistent implementation of the V4L2 user-space API.
+
+Buffer types
+------------
+
+Not all video devices use the same kind of buffers. In fact, there are (at
+least) three common variations:
+
+ - Buffers which are scattered in both the physical and (kernel) virtual
+ address spaces. (Almost) all user-space buffers are like this, but it
+ makes great sense to allocate kernel-space buffers this way as well when
+ it is possible. Unfortunately, it is not always possible; working with
+ this kind of buffer normally requires hardware which can do
+ scatter/gather DMA operations.
+
+ - Buffers which are physically scattered, but which are virtually
+ contiguous; buffers allocated with vmalloc(), in other words. These
+ buffers are just as hard to use for DMA operations, but they can be
+ useful in situations where DMA is not available but virtually-contiguous
+ buffers are convenient.
+
+ - Buffers which are physically contiguous. Allocation of this kind of
+ buffer can be unreliable on fragmented systems, but simpler DMA
+ controllers cannot deal with anything else.
+
+Videobuf can work with all three types of buffers, but the driver author
+must pick one at the outset and design the driver around that decision.
+
+[It's worth noting that there's a fourth kind of buffer: "overlay" buffers
+which are located within the system's video memory. The overlay
+functionality is considered to be deprecated for most use, but it still
+shows up occasionally in system-on-chip drivers where the performance
+benefits merit the use of this technique. Overlay buffers can be handled
+as a form of scattered buffer, but there are very few implementations in
+the kernel and a description of this technique is currently beyond the
+scope of this document.]
+
+Data structures, callbacks, and initialization
+----------------------------------------------
+
+Depending on which type of buffers are being used, the driver should
+include one of the following files:
+
+.. code-block:: none
+
+ <media/videobuf-dma-sg.h> /* Physically scattered */
+ <media/videobuf-vmalloc.h> /* vmalloc() buffers */
+ <media/videobuf-dma-contig.h> /* Physically contiguous */
+
+The driver's data structure describing a V4L2 device should include a
+struct videobuf_queue instance for the management of the buffer queue,
+along with a list_head for the queue of available buffers. There will also
+need to be an interrupt-safe spinlock which is used to protect (at least)
+the queue.
+
+The next step is to write four simple callbacks to help videobuf deal with
+the management of buffers:
+
+.. code-block:: none
+
+ struct videobuf_queue_ops {
+ int (*buf_setup)(struct videobuf_queue *q,
+ unsigned int *count, unsigned int *size);
+ int (*buf_prepare)(struct videobuf_queue *q,
+ struct videobuf_buffer *vb,
+ enum v4l2_field field);
+ void (*buf_queue)(struct videobuf_queue *q,
+ struct videobuf_buffer *vb);
+ void (*buf_release)(struct videobuf_queue *q,
+ struct videobuf_buffer *vb);
+ };
+
+buf_setup() is called early in the I/O process, when streaming is being
+initiated; its purpose is to tell videobuf about the I/O stream. The count
+parameter will be a suggested number of buffers to use; the driver should
+check it for rationality and adjust it if need be. As a practical rule, a
+minimum of two buffers are needed for proper streaming, and there is
+usually a maximum (which cannot exceed 32) which makes sense for each
+device. The size parameter should be set to the expected (maximum) size
+for each frame of data.
+
+Each buffer (in the form of a struct videobuf_buffer pointer) will be
+passed to buf_prepare(), which should set the buffer's size, width, height,
+and field fields properly. If the buffer's state field is
+VIDEOBUF_NEEDS_INIT, the driver should pass it to:
+
+.. code-block:: none
+
+ int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
+ struct v4l2_framebuffer *fbuf);
+
+Among other things, this call will usually allocate memory for the buffer.
+Finally, the buf_prepare() function should set the buffer's state to
+VIDEOBUF_PREPARED.
+
+When a buffer is queued for I/O, it is passed to buf_queue(), which should
+put it onto the driver's list of available buffers and set its state to
+VIDEOBUF_QUEUED. Note that this function is called with the queue spinlock
+held; if it tries to acquire it as well things will come to a screeching
+halt. Yes, this is the voice of experience. Note also that videobuf may
+wait on the first buffer in the queue; placing other buffers in front of it
+could again gum up the works. So use list_add_tail() to enqueue buffers.
+
+Finally, buf_release() is called when a buffer is no longer intended to be
+used. The driver should ensure that there is no I/O active on the buffer,
+then pass it to the appropriate free routine(s):
+
+.. code-block:: none
+
+ /* Scatter/gather drivers */
+ int videobuf_dma_unmap(struct videobuf_queue *q,
+ struct videobuf_dmabuf *dma);
+ int videobuf_dma_free(struct videobuf_dmabuf *dma);
+
+ /* vmalloc drivers */
+ void videobuf_vmalloc_free (struct videobuf_buffer *buf);
+
+ /* Contiguous drivers */
+ void videobuf_dma_contig_free(struct videobuf_queue *q,
+ struct videobuf_buffer *buf);
+
+One way to ensure that a buffer is no longer under I/O is to pass it to:
+
+.. code-block:: none
+
+ int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr);
+
+Here, vb is the buffer, non_blocking indicates whether non-blocking I/O
+should be used (it should be zero in the buf_release() case), and intr
+controls whether an interruptible wait is used.
+
+File operations
+---------------
+
+At this point, much of the work is done; much of the rest is slipping
+videobuf calls into the implementation of the other driver callbacks. The
+first step is in the open() function, which must initialize the
+videobuf queue. The function to use depends on the type of buffer used:
+
+.. code-block:: none
+
+ void videobuf_queue_sg_init(struct videobuf_queue *q,
+ struct videobuf_queue_ops *ops,
+ struct device *dev,
+ spinlock_t *irqlock,
+ enum v4l2_buf_type type,
+ enum v4l2_field field,
+ unsigned int msize,
+ void *priv);
+
+ void videobuf_queue_vmalloc_init(struct videobuf_queue *q,
+ struct videobuf_queue_ops *ops,
+ struct device *dev,
+ spinlock_t *irqlock,
+ enum v4l2_buf_type type,
+ enum v4l2_field field,
+ unsigned int msize,
+ void *priv);
+
+ void videobuf_queue_dma_contig_init(struct videobuf_queue *q,
+ struct videobuf_queue_ops *ops,
+ struct device *dev,
+ spinlock_t *irqlock,
+ enum v4l2_buf_type type,
+ enum v4l2_field field,
+ unsigned int msize,
+ void *priv);
+
+In each case, the parameters are the same: q is the queue structure for the
+device, ops is the set of callbacks as described above, dev is the device
+structure for this video device, irqlock is an interrupt-safe spinlock to
+protect access to the data structures, type is the buffer type used by the
+device (cameras will use V4L2_BUF_TYPE_VIDEO_CAPTURE, for example), field
+describes which field is being captured (often V4L2_FIELD_NONE for
+progressive devices), msize is the size of any containing structure used
+around struct videobuf_buffer, and priv is a private data pointer which
+shows up in the priv_data field of struct videobuf_queue. Note that these
+are void functions which, evidently, are immune to failure.
+
+V4L2 capture drivers can be written to support either of two APIs: the
+read() system call and the rather more complicated streaming mechanism. As
+a general rule, it is necessary to support both to ensure that all
+applications have a chance of working with the device. Videobuf makes it
+easy to do that with the same code. To implement read(), the driver need
+only make a call to one of:
+
+.. code-block:: none
+
+ ssize_t videobuf_read_one(struct videobuf_queue *q,
+ char __user *data, size_t count,
+ loff_t *ppos, int nonblocking);
+
+ ssize_t videobuf_read_stream(struct videobuf_queue *q,
+ char __user *data, size_t count,
+ loff_t *ppos, int vbihack, int nonblocking);
+
+Either one of these functions will read frame data into data, returning the
+amount actually read; the difference is that videobuf_read_one() will only
+read a single frame, while videobuf_read_stream() will read multiple frames
+if they are needed to satisfy the count requested by the application. A
+typical driver read() implementation will start the capture engine, call
+one of the above functions, then stop the engine before returning (though a
+smarter implementation might leave the engine running for a little while in
+anticipation of another read() call happening in the near future).
+
+The poll() function can usually be implemented with a direct call to:
+
+.. code-block:: none
+
+ unsigned int videobuf_poll_stream(struct file *file,
+ struct videobuf_queue *q,
+ poll_table *wait);
+
+Note that the actual wait queue eventually used will be the one associated
+with the first available buffer.
+
+When streaming I/O is done to kernel-space buffers, the driver must support
+the mmap() system call to enable user space to access the data. In many
+V4L2 drivers, the often-complex mmap() implementation simplifies to a
+single call to:
+
+.. code-block:: none
+
+ int videobuf_mmap_mapper(struct videobuf_queue *q,
+ struct vm_area_struct *vma);
+
+Everything else is handled by the videobuf code.
+
+The release() function requires two separate videobuf calls:
+
+.. code-block:: none
+
+ void videobuf_stop(struct videobuf_queue *q);
+ int videobuf_mmap_free(struct videobuf_queue *q);
+
+The call to videobuf_stop() terminates any I/O in progress - though it is
+still up to the driver to stop the capture engine. The call to
+videobuf_mmap_free() will ensure that all buffers have been unmapped; if
+so, they will all be passed to the buf_release() callback. If buffers
+remain mapped, videobuf_mmap_free() returns an error code instead. The
+purpose is clearly to cause the closing of the file descriptor to fail if
+buffers are still mapped, but every driver in the 2.6.32 kernel cheerfully
+ignores its return value.
+
+ioctl() operations
+------------------
+
+The V4L2 API includes a very long list of driver callbacks to respond to
+the many ioctl() commands made available to user space. A number of these
+- those associated with streaming I/O - turn almost directly into videobuf
+calls. The relevant helper functions are:
+
+.. code-block:: none
+
+ int videobuf_reqbufs(struct videobuf_queue *q,
+ struct v4l2_requestbuffers *req);
+ int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b);
+ int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b);
+ int videobuf_dqbuf(struct videobuf_queue *q, struct v4l2_buffer *b,
+ int nonblocking);
+ int videobuf_streamon(struct videobuf_queue *q);
+ int videobuf_streamoff(struct videobuf_queue *q);
+
+So, for example, a VIDIOC_REQBUFS call turns into a call to the driver's
+vidioc_reqbufs() callback which, in turn, usually only needs to locate the
+proper struct videobuf_queue pointer and pass it to videobuf_reqbufs().
+These support functions can replace a great deal of buffer management
+boilerplate in a lot of V4L2 drivers.
+
+The vidioc_streamon() and vidioc_streamoff() functions will be a bit more
+complex, of course, since they will also need to deal with starting and
+stopping the capture engine.
+
+Buffer allocation
+-----------------
+
+Thus far, we have talked about buffers, but have not looked at how they are
+allocated. The scatter/gather case is the most complex on this front. For
+allocation, the driver can leave buffer allocation entirely up to the
+videobuf layer; in this case, buffers will be allocated as anonymous
+user-space pages and will be very scattered indeed. If the application is
+using user-space buffers, no allocation is needed; the videobuf layer will
+take care of calling get_user_pages() and filling in the scatterlist array.
+
+If the driver needs to do its own memory allocation, it should be done in
+the vidioc_reqbufs() function, *after* calling videobuf_reqbufs(). The
+first step is a call to:
+
+.. code-block:: none
+
+ struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf);
+
+The returned videobuf_dmabuf structure (defined in
+<media/videobuf-dma-sg.h>) includes a couple of relevant fields:
+
+.. code-block:: none
+
+ struct scatterlist *sglist;
+ int sglen;
+
+The driver must allocate an appropriately-sized scatterlist array and
+populate it with pointers to the pieces of the allocated buffer; sglen
+should be set to the length of the array.
+
+Drivers using the vmalloc() method need not (and cannot) concern themselves
+with buffer allocation at all; videobuf will handle those details. The
+same is normally true of contiguous-DMA drivers as well; videobuf will
+allocate the buffers (with dma_alloc_coherent()) when it sees fit. That
+means that these drivers may be trying to do high-order allocations at any
+time, an operation which is not always guaranteed to work. Some drivers
+play tricks by allocating DMA space at system boot time; videobuf does not
+currently play well with those drivers.
+
+As of 2.6.31, contiguous-DMA drivers can work with a user-supplied buffer,
+as long as that buffer is physically contiguous. Normal user-space
+allocations will not meet that criterion, but buffers obtained from other
+kernel drivers, or those contained within huge pages, will work with these
+drivers.
+
+Filling the buffers
+-------------------
+
+The final part of a videobuf implementation has no direct callback - it's
+the portion of the code which actually puts frame data into the buffers,
+usually in response to interrupts from the device. For all types of
+drivers, this process works approximately as follows:
+
+ - Obtain the next available buffer and make sure that somebody is actually
+ waiting for it.
+
+ - Get a pointer to the memory and put video data there.
+
+ - Mark the buffer as done and wake up the process waiting for it.
+
+Step (1) above is done by looking at the driver-managed list_head structure
+- the one which is filled in the buf_queue() callback. Because starting
+the engine and enqueueing buffers are done in separate steps, it's possible
+for the engine to be running without any buffers available - in the
+vmalloc() case especially. So the driver should be prepared for the list
+to be empty. It is equally possible that nobody is yet interested in the
+buffer; the driver should not remove it from the list or fill it until a
+process is waiting on it. That test can be done by examining the buffer's
+done field (a wait_queue_head_t structure) with waitqueue_active().
+
+A buffer's state should be set to VIDEOBUF_ACTIVE before being mapped for
+DMA; that ensures that the videobuf layer will not try to do anything with
+it while the device is transferring data.
+
+For scatter/gather drivers, the needed memory pointers will be found in the
+scatterlist structure described above. Drivers using the vmalloc() method
+can get a memory pointer with:
+
+.. code-block:: none
+
+ void *videobuf_to_vmalloc(struct videobuf_buffer *buf);
+
+For contiguous DMA drivers, the function to use is:
+
+.. code-block:: none
+
+ dma_addr_t videobuf_to_dma_contig(struct videobuf_buffer *buf);
+
+The contiguous DMA API goes out of its way to hide the kernel-space address
+of the DMA buffer from drivers.
+
+The final step is to set the size field of the relevant videobuf_buffer
+structure to the actual size of the captured image, set state to
+VIDEOBUF_DONE, then call wake_up() on the done queue. At this point, the
+buffer is owned by the videobuf layer and the driver should not touch it
+again.
+
+Developers who are interested in more information can go into the relevant
+header files; there are a few low-level functions declared there which have
+not been talked about here. Note also that all of these calls are exported
+GPL-only, so they will not be available to non-GPL kernel modules.
diff --git a/Documentation/driver-api/media/v4l2-videobuf2.rst b/Documentation/driver-api/media/v4l2-videobuf2.rst
new file mode 100644
index 0000000000..1044f64ff1
--- /dev/null
+++ b/Documentation/driver-api/media/v4l2-videobuf2.rst
@@ -0,0 +1,12 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. _vb2_framework:
+
+V4L2 videobuf2 functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/videobuf2-core.h
+
+.. kernel-doc:: include/media/videobuf2-v4l2.h
+
+.. kernel-doc:: include/media/videobuf2-memops.h
diff --git a/Documentation/driver-api/mei/hdcp.rst b/Documentation/driver-api/mei/hdcp.rst
new file mode 100644
index 0000000000..e85a065b1c
--- /dev/null
+++ b/Documentation/driver-api/mei/hdcp.rst
@@ -0,0 +1,32 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+HDCP:
+=====
+
+ME FW as a security engine provides the capability for setting up
+HDCP2.2 protocol negotiation between the Intel graphics device and
+an HDC2.2 sink.
+
+ME FW prepares HDCP2.2 negotiation parameters, signs and encrypts them
+according the HDCP 2.2 spec. The Intel graphics sends the created blob
+to the HDCP2.2 sink.
+
+Similarly, the HDCP2.2 sink's response is transferred to ME FW
+for decryption and verification.
+
+Once all the steps of HDCP2.2 negotiation are completed,
+upon request ME FW will configure the port as authenticated and supply
+the HDCP encryption keys to Intel graphics hardware.
+
+
+mei_hdcp driver
+---------------
+.. kernel-doc:: drivers/misc/mei/hdcp/mei_hdcp.c
+ :doc: MEI_HDCP Client Driver
+
+mei_hdcp api
+------------
+
+.. kernel-doc:: drivers/misc/mei/hdcp/mei_hdcp.c
+ :functions:
+
diff --git a/Documentation/driver-api/mei/iamt.rst b/Documentation/driver-api/mei/iamt.rst
new file mode 100644
index 0000000000..6ef3e61368
--- /dev/null
+++ b/Documentation/driver-api/mei/iamt.rst
@@ -0,0 +1,101 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Intel(R) Active Management Technology (Intel AMT)
+=================================================
+
+Prominent usage of the Intel ME Interface is to communicate with Intel(R)
+Active Management Technology (Intel AMT) implemented in firmware running on
+the Intel ME.
+
+Intel AMT provides the ability to manage a host remotely out-of-band (OOB)
+even when the operating system running on the host processor has crashed or
+is in a sleep state.
+
+Some examples of Intel AMT usage are:
+ - Monitoring hardware state and platform components
+ - Remote power off/on (useful for green computing or overnight IT
+ maintenance)
+ - OS updates
+ - Storage of useful platform information such as software assets
+ - Built-in hardware KVM
+ - Selective network isolation of Ethernet and IP protocol flows based
+ on policies set by a remote management console
+ - IDE device redirection from remote management console
+
+Intel AMT (OOB) communication is based on SOAP (deprecated
+starting with Release 6.0) over HTTP/S or WS-Management protocol over
+HTTP/S that are received from a remote management console application.
+
+For more information about Intel AMT:
+https://software.intel.com/sites/manageability/AMT_Implementation_and_Reference_Guide/default.htm
+
+
+Intel AMT Applications
+----------------------
+
+ 1) Intel Local Management Service (Intel LMS)
+
+ Applications running locally on the platform communicate with Intel AMT Release
+ 2.0 and later releases in the same way that network applications do via SOAP
+ over HTTP (deprecated starting with Release 6.0) or with WS-Management over
+ SOAP over HTTP. This means that some Intel AMT features can be accessed from a
+ local application using the same network interface as a remote application
+ communicating with Intel AMT over the network.
+
+ When a local application sends a message addressed to the local Intel AMT host
+ name, the Intel LMS, which listens for traffic directed to the host name,
+ intercepts the message and routes it to the Intel MEI.
+ For more information:
+ https://software.intel.com/sites/manageability/AMT_Implementation_and_Reference_Guide/default.htm
+ Under "About Intel AMT" => "Local Access"
+
+ For downloading Intel LMS:
+ https://github.com/intel/lms
+
+ The Intel LMS opens a connection using the Intel MEI driver to the Intel LMS
+ firmware feature using a defined GUID and then communicates with the feature
+ using a protocol called Intel AMT Port Forwarding Protocol (Intel APF protocol).
+ The protocol is used to maintain multiple sessions with Intel AMT from a
+ single application.
+
+ See the protocol specification in the Intel AMT Software Development Kit (SDK)
+ https://software.intel.com/sites/manageability/AMT_Implementation_and_Reference_Guide/default.htm
+ Under "SDK Resources" => "Intel(R) vPro(TM) Gateway (MPS)"
+ => "Information for Intel(R) vPro(TM) Gateway Developers"
+ => "Description of the Intel AMT Port Forwarding (APF) Protocol"
+
+ 2) Intel AMT Remote configuration using a Local Agent
+
+ A Local Agent enables IT personnel to configure Intel AMT out-of-the-box
+ without requiring installing additional data to enable setup. The remote
+ configuration process may involve an ISV-developed remote configuration
+ agent that runs on the host.
+ For more information:
+ https://software.intel.com/sites/manageability/AMT_Implementation_and_Reference_Guide/default.htm
+ Under "Setup and Configuration of Intel AMT" =>
+ "SDK Tools Supporting Setup and Configuration" =>
+ "Using the Local Agent Sample"
+
+Intel AMT OS Health Watchdog
+----------------------------
+
+The Intel AMT Watchdog is an OS Health (Hang/Crash) watchdog.
+Whenever the OS hangs or crashes, Intel AMT will send an event
+to any subscriber to this event. This mechanism means that
+IT knows when a platform crashes even when there is a hard failure on the host.
+
+The Intel AMT Watchdog is composed of two parts:
+ 1) Firmware feature - receives the heartbeats
+ and sends an event when the heartbeats stop.
+ 2) Intel MEI iAMT watchdog driver - connects to the watchdog feature,
+ configures the watchdog and sends the heartbeats.
+
+The Intel iAMT watchdog MEI driver uses the kernel watchdog API to configure
+the Intel AMT Watchdog and to send heartbeats to it. The default timeout of the
+watchdog is 120 seconds.
+
+If the Intel AMT is not enabled in the firmware then the watchdog client won't enumerate
+on the me client bus and watchdog devices won't be exposed.
+
+---
+linux-mei@linux.intel.com
diff --git a/Documentation/driver-api/mei/index.rst b/Documentation/driver-api/mei/index.rst
new file mode 100644
index 0000000000..3a22b522ee
--- /dev/null
+++ b/Documentation/driver-api/mei/index.rst
@@ -0,0 +1,23 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. include:: <isonum.txt>
+
+===================================================
+Intel(R) Management Engine Interface (Intel(R) MEI)
+===================================================
+
+**Copyright** |copy| 2019 Intel Corporation
+
+
+.. only:: html
+
+ .. class:: toc-title
+
+ Table of Contents
+
+.. toctree::
+ :maxdepth: 3
+
+ mei
+ mei-client-bus
+ iamt
diff --git a/Documentation/driver-api/mei/mei-client-bus.rst b/Documentation/driver-api/mei/mei-client-bus.rst
new file mode 100644
index 0000000000..f242b3f8d6
--- /dev/null
+++ b/Documentation/driver-api/mei/mei-client-bus.rst
@@ -0,0 +1,168 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============================================
+Intel(R) Management Engine (ME) Client bus API
+==============================================
+
+
+Rationale
+=========
+
+The MEI character device is useful for dedicated applications to send and receive
+data to the many FW appliance found in Intel's ME from the user space.
+However, for some of the ME functionalities it makes sense to leverage existing software
+stack and expose them through existing kernel subsystems.
+
+In order to plug seamlessly into the kernel device driver model we add kernel virtual
+bus abstraction on top of the MEI driver. This allows implementing Linux kernel drivers
+for the various MEI features as a stand alone entities found in their respective subsystem.
+Existing device drivers can even potentially be re-used by adding an MEI CL bus layer to
+the existing code.
+
+
+MEI CL bus API
+==============
+
+A driver implementation for an MEI Client is very similar to any other existing bus
+based device drivers. The driver registers itself as an MEI CL bus driver through
+the ``struct mei_cl_driver`` structure defined in :file:`include/linux/mei_cl_bus.c`
+
+.. code-block:: C
+
+ struct mei_cl_driver {
+ struct device_driver driver;
+ const char *name;
+
+ const struct mei_cl_device_id *id_table;
+
+ int (*probe)(struct mei_cl_device *dev, const struct mei_cl_id *id);
+ int (*remove)(struct mei_cl_device *dev);
+ };
+
+
+
+The mei_cl_device_id structure defined in :file:`include/linux/mod_devicetable.h` allows a
+driver to bind itself against a device name.
+
+.. code-block:: C
+
+ struct mei_cl_device_id {
+ char name[MEI_CL_NAME_SIZE];
+ uuid_le uuid;
+ __u8 version;
+ kernel_ulong_t driver_info;
+ };
+
+To actually register a driver on the ME Client bus one must call the :c:func:`mei_cl_add_driver`
+API. This is typically called at module initialization time.
+
+Once the driver is registered and bound to the device, a driver will typically
+try to do some I/O on this bus and this should be done through the :c:func:`mei_cl_send`
+and :c:func:`mei_cl_recv` functions. More detailed information is in :ref:`api` section.
+
+In order for a driver to be notified about pending traffic or event, the driver
+should register a callback via :c:func:`mei_cl_devev_register_rx_cb` and
+:c:func:`mei_cldev_register_notify_cb` function respectively.
+
+.. _api:
+
+API:
+----
+.. kernel-doc:: drivers/misc/mei/bus.c
+ :export: drivers/misc/mei/bus.c
+
+
+
+Example
+=======
+
+As a theoretical example let's pretend the ME comes with a "contact" NFC IP.
+The driver init and exit routines for this device would look like:
+
+.. code-block:: C
+
+ #define CONTACT_DRIVER_NAME "contact"
+
+ static struct mei_cl_device_id contact_mei_cl_tbl[] = {
+ { CONTACT_DRIVER_NAME, },
+
+ /* required last entry */
+ { }
+ };
+ MODULE_DEVICE_TABLE(mei_cl, contact_mei_cl_tbl);
+
+ static struct mei_cl_driver contact_driver = {
+ .id_table = contact_mei_tbl,
+ .name = CONTACT_DRIVER_NAME,
+
+ .probe = contact_probe,
+ .remove = contact_remove,
+ };
+
+ static int contact_init(void)
+ {
+ int r;
+
+ r = mei_cl_driver_register(&contact_driver);
+ if (r) {
+ pr_err(CONTACT_DRIVER_NAME ": driver registration failed\n");
+ return r;
+ }
+
+ return 0;
+ }
+
+ static void __exit contact_exit(void)
+ {
+ mei_cl_driver_unregister(&contact_driver);
+ }
+
+ module_init(contact_init);
+ module_exit(contact_exit);
+
+And the driver's simplified probe routine would look like that:
+
+.. code-block:: C
+
+ int contact_probe(struct mei_cl_device *dev, struct mei_cl_device_id *id)
+ {
+ [...]
+ mei_cldev_enable(dev);
+
+ mei_cldev_register_rx_cb(dev, contact_rx_cb);
+
+ return 0;
+ }
+
+In the probe routine the driver first enable the MEI device and then registers
+an rx handler which is as close as it can get to registering a threaded IRQ handler.
+The handler implementation will typically call :c:func:`mei_cldev_recv` and then
+process received data.
+
+.. code-block:: C
+
+ #define MAX_PAYLOAD 128
+ #define HDR_SIZE 4
+ static void conntact_rx_cb(struct mei_cl_device *cldev)
+ {
+ struct contact *c = mei_cldev_get_drvdata(cldev);
+ unsigned char payload[MAX_PAYLOAD];
+ ssize_t payload_sz;
+
+ payload_sz = mei_cldev_recv(cldev, payload, MAX_PAYLOAD)
+ if (reply_size < HDR_SIZE) {
+ return;
+ }
+
+ c->process_rx(payload);
+
+ }
+
+MEI Client Bus Drivers
+======================
+
+.. toctree::
+ :maxdepth: 2
+
+ hdcp
+ nfc
diff --git a/Documentation/driver-api/mei/mei.rst b/Documentation/driver-api/mei/mei.rst
new file mode 100644
index 0000000000..4f2ced4ccd
--- /dev/null
+++ b/Documentation/driver-api/mei/mei.rst
@@ -0,0 +1,213 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Introduction
+============
+
+The Intel Management Engine (Intel ME) is an isolated and protected computing
+resource (Co-processor) residing inside certain Intel chipsets. The Intel ME
+provides support for computer/IT management and security features.
+The actual feature set depends on the Intel chipset SKU.
+
+The Intel Management Engine Interface (Intel MEI, previously known as HECI)
+is the interface between the Host and Intel ME. This interface is exposed
+to the host as a PCI device, actually multiple PCI devices might be exposed.
+The Intel MEI Driver is in charge of the communication channel between
+a host application and the Intel ME features.
+
+Each Intel ME feature, or Intel ME Client is addressed by a unique GUID and
+each client has its own protocol. The protocol is message-based with a
+header and payload up to maximal number of bytes advertised by the client,
+upon connection.
+
+Intel MEI Driver
+================
+
+The driver exposes a character device with device nodes /dev/meiX.
+
+An application maintains communication with an Intel ME feature while
+/dev/meiX is open. The binding to a specific feature is performed by calling
+:c:macro:`MEI_CONNECT_CLIENT_IOCTL`, which passes the desired GUID.
+The number of instances of an Intel ME feature that can be opened
+at the same time depends on the Intel ME feature, but most of the
+features allow only a single instance.
+
+The driver is transparent to data that are passed between firmware feature
+and host application.
+
+Because some of the Intel ME features can change the system
+configuration, the driver by default allows only a privileged
+user to access it.
+
+The session is terminated calling :c:expr:`close(fd)`.
+
+A code snippet for an application communicating with Intel AMTHI client:
+
+In order to support virtualization or sandboxing a trusted supervisor
+can use :c:macro:`MEI_CONNECT_CLIENT_IOCTL_VTAG` to create
+virtual channels with an Intel ME feature. Not all features support
+virtual channels such client with answer EOPNOTSUPP.
+
+.. code-block:: C
+
+ struct mei_connect_client_data data;
+ fd = open(MEI_DEVICE);
+
+ data.d.in_client_uuid = AMTHI_GUID;
+
+ ioctl(fd, IOCTL_MEI_CONNECT_CLIENT, &data);
+
+ printf("Ver=%d, MaxLen=%ld\n",
+ data.d.in_client_uuid.protocol_version,
+ data.d.in_client_uuid.max_msg_length);
+
+ [...]
+
+ write(fd, amthi_req_data, amthi_req_data_len);
+
+ [...]
+
+ read(fd, &amthi_res_data, amthi_res_data_len);
+
+ [...]
+ close(fd);
+
+
+User space API
+
+IOCTLs:
+=======
+
+The Intel MEI Driver supports the following IOCTL commands:
+
+IOCTL_MEI_CONNECT_CLIENT
+-------------------------
+Connect to firmware Feature/Client.
+
+.. code-block:: none
+
+ Usage:
+
+ struct mei_connect_client_data client_data;
+
+ ioctl(fd, IOCTL_MEI_CONNECT_CLIENT, &client_data);
+
+ Inputs:
+
+ struct mei_connect_client_data - contain the following
+ Input field:
+
+ in_client_uuid - GUID of the FW Feature that needs
+ to connect to.
+ Outputs:
+ out_client_properties - Client Properties: MTU and Protocol Version.
+
+ Error returns:
+
+ ENOTTY No such client (i.e. wrong GUID) or connection is not allowed.
+ EINVAL Wrong IOCTL Number
+ ENODEV Device or Connection is not initialized or ready.
+ ENOMEM Unable to allocate memory to client internal data.
+ EFAULT Fatal Error (e.g. Unable to access user input data)
+ EBUSY Connection Already Open
+
+:Note:
+ max_msg_length (MTU) in client properties describes the maximum
+ data that can be sent or received. (e.g. if MTU=2K, can send
+ requests up to bytes 2k and received responses up to 2k bytes).
+
+IOCTL_MEI_CONNECT_CLIENT_VTAG:
+------------------------------
+
+.. code-block:: none
+
+ Usage:
+
+ struct mei_connect_client_data_vtag client_data_vtag;
+
+ ioctl(fd, IOCTL_MEI_CONNECT_CLIENT_VTAG, &client_data_vtag);
+
+ Inputs:
+
+ struct mei_connect_client_data_vtag - contain the following
+ Input field:
+
+ in_client_uuid - GUID of the FW Feature that needs
+ to connect to.
+ vtag - virtual tag [1, 255]
+
+ Outputs:
+ out_client_properties - Client Properties: MTU and Protocol Version.
+
+ Error returns:
+
+ ENOTTY No such client (i.e. wrong GUID) or connection is not allowed.
+ EINVAL Wrong IOCTL Number or tag == 0
+ ENODEV Device or Connection is not initialized or ready.
+ ENOMEM Unable to allocate memory to client internal data.
+ EFAULT Fatal Error (e.g. Unable to access user input data)
+ EBUSY Connection Already Open
+ EOPNOTSUPP Vtag is not supported
+
+IOCTL_MEI_NOTIFY_SET
+---------------------
+Enable or disable event notifications.
+
+
+.. code-block:: none
+
+ Usage:
+
+ uint32_t enable;
+
+ ioctl(fd, IOCTL_MEI_NOTIFY_SET, &enable);
+
+
+ uint32_t enable = 1;
+ or
+ uint32_t enable[disable] = 0;
+
+ Error returns:
+
+
+ EINVAL Wrong IOCTL Number
+ ENODEV Device is not initialized or the client not connected
+ ENOMEM Unable to allocate memory to client internal data.
+ EFAULT Fatal Error (e.g. Unable to access user input data)
+ EOPNOTSUPP if the device doesn't support the feature
+
+:Note:
+ The client must be connected in order to enable notification events
+
+
+IOCTL_MEI_NOTIFY_GET
+--------------------
+Retrieve event
+
+.. code-block:: none
+
+ Usage:
+ uint32_t event;
+ ioctl(fd, IOCTL_MEI_NOTIFY_GET, &event);
+
+ Outputs:
+ 1 - if an event is pending
+ 0 - if there is no even pending
+
+ Error returns:
+ EINVAL Wrong IOCTL Number
+ ENODEV Device is not initialized or the client not connected
+ ENOMEM Unable to allocate memory to client internal data.
+ EFAULT Fatal Error (e.g. Unable to access user input data)
+ EOPNOTSUPP if the device doesn't support the feature
+
+:Note:
+ The client must be connected and event notification has to be enabled
+ in order to receive an event
+
+
+
+Supported Chipsets
+==================
+82X38/X48 Express and newer
+
+linux-mei@linux.intel.com
diff --git a/Documentation/driver-api/mei/nfc.rst b/Documentation/driver-api/mei/nfc.rst
new file mode 100644
index 0000000000..8fe8664c28
--- /dev/null
+++ b/Documentation/driver-api/mei/nfc.rst
@@ -0,0 +1,28 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+MEI NFC
+-------
+
+Some Intel 8 and 9 Series chipsets support NFC devices connected behind
+the Intel Management Engine controller.
+MEI client bus exposes the NFC chips as NFC phy devices and enables
+binding with Microread and NXP PN544 NFC device driver from the Linux NFC
+subsystem.
+
+.. kernel-render:: DOT
+ :alt: MEI NFC digraph
+ :caption: **MEI NFC** Stack
+
+ digraph NFC {
+ cl_nfc -> me_cl_nfc;
+ "drivers/nfc/mei_phy" -> cl_nfc [lhead=bus];
+ "drivers/nfc/microread/mei" -> cl_nfc;
+ "drivers/nfc/microread/mei" -> "drivers/nfc/mei_phy";
+ "drivers/nfc/pn544/mei" -> cl_nfc;
+ "drivers/nfc/pn544/mei" -> "drivers/nfc/mei_phy";
+ "net/nfc" -> "drivers/nfc/microread/mei";
+ "net/nfc" -> "drivers/nfc/pn544/mei";
+ "neard" -> "net/nfc";
+ cl_nfc [label="mei/bus(nfc)"];
+ me_cl_nfc [label="me fw (nfc)"];
+ }
diff --git a/Documentation/driver-api/memory-devices/index.rst b/Documentation/driver-api/memory-devices/index.rst
new file mode 100644
index 0000000000..28101458cd
--- /dev/null
+++ b/Documentation/driver-api/memory-devices/index.rst
@@ -0,0 +1,18 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=========================
+Memory Controller drivers
+=========================
+
+.. toctree::
+ :maxdepth: 1
+
+ ti-emif
+ ti-gpmc
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/memory-devices/ti-emif.rst b/Documentation/driver-api/memory-devices/ti-emif.rst
new file mode 100644
index 0000000000..dea2ad9bcd
--- /dev/null
+++ b/Documentation/driver-api/memory-devices/ti-emif.rst
@@ -0,0 +1,64 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============================
+TI EMIF SDRAM Controller Driver
+===============================
+
+Author
+======
+Aneesh V <aneesh@ti.com>
+
+Location
+========
+driver/memory/emif.c
+
+Supported SoCs:
+===============
+TI OMAP44xx
+TI OMAP54xx
+
+Menuconfig option:
+==================
+Device Drivers
+ Memory devices
+ Texas Instruments EMIF driver
+
+Description
+===========
+This driver is for the EMIF module available in Texas Instruments
+SoCs. EMIF is an SDRAM controller that, based on its revision,
+supports one or more of DDR2, DDR3, and LPDDR2 SDRAM protocols.
+This driver takes care of only LPDDR2 memories presently. The
+functions of the driver includes re-configuring AC timing
+parameters and other settings during frequency, voltage and
+temperature changes
+
+Platform Data (see include/linux/platform_data/emif_plat.h)
+===========================================================
+DDR device details and other board dependent and SoC dependent
+information can be passed through platform data (struct emif_platform_data)
+
+- DDR device details: 'struct ddr_device_info'
+- Device AC timings: 'struct lpddr2_timings' and 'struct lpddr2_min_tck'
+- Custom configurations: customizable policy options through
+ 'struct emif_custom_configs'
+- IP revision
+- PHY type
+
+Interface to the external world
+===============================
+EMIF driver registers notifiers for voltage and frequency changes
+affecting EMIF and takes appropriate actions when these are invoked.
+
+- freq_pre_notify_handling()
+- freq_post_notify_handling()
+- volt_notify_handling()
+
+Debugfs
+=======
+The driver creates two debugfs entries per device.
+
+- regcache_dump : dump of register values calculated and saved for all
+ frequencies used so far.
+- mr4 : last polled value of MR4 register in the LPDDR2 device. MR4
+ indicates the current temperature level of the device.
diff --git a/Documentation/driver-api/memory-devices/ti-gpmc.rst b/Documentation/driver-api/memory-devices/ti-gpmc.rst
new file mode 100644
index 0000000000..b1bb86871a
--- /dev/null
+++ b/Documentation/driver-api/memory-devices/ti-gpmc.rst
@@ -0,0 +1,179 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+========================================
+GPMC (General Purpose Memory Controller)
+========================================
+
+GPMC is an unified memory controller dedicated to interfacing external
+memory devices like
+
+ * Asynchronous SRAM like memories and application specific integrated
+ circuit devices.
+ * Asynchronous, synchronous, and page mode burst NOR flash devices
+ NAND flash
+ * Pseudo-SRAM devices
+
+GPMC is found on Texas Instruments SoC's (OMAP based)
+IP details: https://www.ti.com/lit/pdf/spruh73 section 7.1
+
+
+GPMC generic timing calculation:
+================================
+
+GPMC has certain timings that has to be programmed for proper
+functioning of the peripheral, while peripheral has another set of
+timings. To have peripheral work with gpmc, peripheral timings has to
+be translated to the form gpmc can understand. The way it has to be
+translated depends on the connected peripheral. Also there is a
+dependency for certain gpmc timings on gpmc clock frequency. Hence a
+generic timing routine was developed to achieve above requirements.
+
+Generic routine provides a generic method to calculate gpmc timings
+from gpmc peripheral timings. struct gpmc_device_timings fields has to
+be updated with timings from the datasheet of the peripheral that is
+connected to gpmc. A few of the peripheral timings can be fed either
+in time or in cycles, provision to handle this scenario has been
+provided (refer struct gpmc_device_timings definition). It may so
+happen that timing as specified by peripheral datasheet is not present
+in timing structure, in this scenario, try to correlate peripheral
+timing to the one available. If that doesn't work, try to add a new
+field as required by peripheral, educate generic timing routine to
+handle it, make sure that it does not break any of the existing.
+Then there may be cases where peripheral datasheet doesn't mention
+certain fields of struct gpmc_device_timings, zero those entries.
+
+Generic timing routine has been verified to work properly on
+multiple onenand's and tusb6010 peripherals.
+
+A word of caution: generic timing routine has been developed based
+on understanding of gpmc timings, peripheral timings, available
+custom timing routines, a kind of reverse engineering without
+most of the datasheets & hardware (to be exact none of those supported
+in mainline having custom timing routine) and by simulation.
+
+gpmc timing dependency on peripheral timings:
+
+[<gpmc_timing>: <peripheral timing1>, <peripheral timing2> ...]
+
+1. common
+
+cs_on:
+ t_ceasu
+adv_on:
+ t_avdasu, t_ceavd
+
+2. sync common
+
+sync_clk:
+ clk
+page_burst_access:
+ t_bacc
+clk_activation:
+ t_ces, t_avds
+
+3. read async muxed
+
+adv_rd_off:
+ t_avdp_r
+oe_on:
+ t_oeasu, t_aavdh
+access:
+ t_iaa, t_oe, t_ce, t_aa
+rd_cycle:
+ t_rd_cycle, t_cez_r, t_oez
+
+4. read async non-muxed
+
+adv_rd_off:
+ t_avdp_r
+oe_on:
+ t_oeasu
+access:
+ t_iaa, t_oe, t_ce, t_aa
+rd_cycle:
+ t_rd_cycle, t_cez_r, t_oez
+
+5. read sync muxed
+
+adv_rd_off:
+ t_avdp_r, t_avdh
+oe_on:
+ t_oeasu, t_ach, cyc_aavdh_oe
+access:
+ t_iaa, cyc_iaa, cyc_oe
+rd_cycle:
+ t_cez_r, t_oez, t_ce_rdyz
+
+6. read sync non-muxed
+
+adv_rd_off:
+ t_avdp_r
+oe_on:
+ t_oeasu
+access:
+ t_iaa, cyc_iaa, cyc_oe
+rd_cycle:
+ t_cez_r, t_oez, t_ce_rdyz
+
+7. write async muxed
+
+adv_wr_off:
+ t_avdp_w
+we_on, wr_data_mux_bus:
+ t_weasu, t_aavdh, cyc_aavhd_we
+we_off:
+ t_wpl
+cs_wr_off:
+ t_wph
+wr_cycle:
+ t_cez_w, t_wr_cycle
+
+8. write async non-muxed
+
+adv_wr_off:
+ t_avdp_w
+we_on, wr_data_mux_bus:
+ t_weasu
+we_off:
+ t_wpl
+cs_wr_off:
+ t_wph
+wr_cycle:
+ t_cez_w, t_wr_cycle
+
+9. write sync muxed
+
+adv_wr_off:
+ t_avdp_w, t_avdh
+we_on, wr_data_mux_bus:
+ t_weasu, t_rdyo, t_aavdh, cyc_aavhd_we
+we_off:
+ t_wpl, cyc_wpl
+cs_wr_off:
+ t_wph
+wr_cycle:
+ t_cez_w, t_ce_rdyz
+
+10. write sync non-muxed
+
+adv_wr_off:
+ t_avdp_w
+we_on, wr_data_mux_bus:
+ t_weasu, t_rdyo
+we_off:
+ t_wpl, cyc_wpl
+cs_wr_off:
+ t_wph
+wr_cycle:
+ t_cez_w, t_ce_rdyz
+
+
+Note:
+ Many of gpmc timings are dependent on other gpmc timings (a few
+ gpmc timings purely dependent on other gpmc timings, a reason that
+ some of the gpmc timings are missing above), and it will result in
+ indirect dependency of peripheral timings to gpmc timings other than
+ mentioned above, refer timing routine for more details. To know what
+ these peripheral timings correspond to, please see explanations in
+ struct gpmc_device_timings definition. And for gpmc timings refer
+ IP details (link above).
diff --git a/Documentation/driver-api/men-chameleon-bus.rst b/Documentation/driver-api/men-chameleon-bus.rst
new file mode 100644
index 0000000000..6f0b9ee475
--- /dev/null
+++ b/Documentation/driver-api/men-chameleon-bus.rst
@@ -0,0 +1,187 @@
+=================
+MEN Chameleon Bus
+=================
+
+.. Table of Contents
+ =================
+ 1 Introduction
+ 1.1 Scope of this Document
+ 1.2 Limitations of the current implementation
+ 2 Architecture
+ 2.1 MEN Chameleon Bus
+ 2.2 Carrier Devices
+ 2.3 Parser
+ 3 Resource handling
+ 3.1 Memory Resources
+ 3.2 IRQs
+ 4 Writing an MCB driver
+ 4.1 The driver structure
+ 4.2 Probing and attaching
+ 4.3 Initializing the driver
+ 4.4 Using DMA
+
+
+Introduction
+============
+
+This document describes the architecture and implementation of the MEN
+Chameleon Bus (called MCB throughout this document).
+
+Scope of this Document
+----------------------
+
+This document is intended to be a short overview of the current
+implementation and does by no means describe the complete possibilities of MCB
+based devices.
+
+Limitations of the current implementation
+-----------------------------------------
+
+The current implementation is limited to PCI and PCIe based carrier devices
+that only use a single memory resource and share the PCI legacy IRQ. Not
+implemented are:
+
+- Multi-resource MCB devices like the VME Controller or M-Module carrier.
+- MCB devices that need another MCB device, like SRAM for a DMA Controller's
+ buffer descriptors or a video controller's video memory.
+- A per-carrier IRQ domain for carrier devices that have one (or more) IRQs
+ per MCB device like PCIe based carriers with MSI or MSI-X support.
+
+Architecture
+============
+
+MCB is divided into 3 functional blocks:
+
+- The MEN Chameleon Bus itself,
+- drivers for MCB Carrier Devices and
+- the parser for the Chameleon table.
+
+MEN Chameleon Bus
+-----------------
+
+The MEN Chameleon Bus is an artificial bus system that attaches to a so
+called Chameleon FPGA device found on some hardware produced my MEN Mikro
+Elektronik GmbH. These devices are multi-function devices implemented in a
+single FPGA and usually attached via some sort of PCI or PCIe link. Each
+FPGA contains a header section describing the content of the FPGA. The
+header lists the device id, PCI BAR, offset from the beginning of the PCI
+BAR, size in the FPGA, interrupt number and some other properties currently
+not handled by the MCB implementation.
+
+Carrier Devices
+---------------
+
+A carrier device is just an abstraction for the real world physical bus the
+Chameleon FPGA is attached to. Some IP Core drivers may need to interact with
+properties of the carrier device (like querying the IRQ number of a PCI
+device). To provide abstraction from the real hardware bus, an MCB carrier
+device provides callback methods to translate the driver's MCB function calls
+to hardware related function calls. For example a carrier device may
+implement the get_irq() method which can be translated into a hardware bus
+query for the IRQ number the device should use.
+
+Parser
+------
+
+The parser reads the first 512 bytes of a Chameleon device and parses the
+Chameleon table. Currently the parser only supports the Chameleon v2 variant
+of the Chameleon table but can easily be adopted to support an older or
+possible future variant. While parsing the table's entries new MCB devices
+are allocated and their resources are assigned according to the resource
+assignment in the Chameleon table. After resource assignment is finished, the
+MCB devices are registered at the MCB and thus at the driver core of the
+Linux kernel.
+
+Resource handling
+=================
+
+The current implementation assigns exactly one memory and one IRQ resource
+per MCB device. But this is likely going to change in the future.
+
+Memory Resources
+----------------
+
+Each MCB device has exactly one memory resource, which can be requested from
+the MCB bus. This memory resource is the physical address of the MCB device
+inside the carrier and is intended to be passed to ioremap() and friends. It
+is already requested from the kernel by calling request_mem_region().
+
+IRQs
+----
+
+Each MCB device has exactly one IRQ resource, which can be requested from the
+MCB bus. If a carrier device driver implements the ->get_irq() callback
+method, the IRQ number assigned by the carrier device will be returned,
+otherwise the IRQ number inside the Chameleon table will be returned. This
+number is suitable to be passed to request_irq().
+
+Writing an MCB driver
+=====================
+
+The driver structure
+--------------------
+
+Each MCB driver has a structure to identify the device driver as well as
+device ids which identify the IP Core inside the FPGA. The driver structure
+also contains callback methods which get executed on driver probe and
+removal from the system::
+
+ static const struct mcb_device_id foo_ids[] = {
+ { .device = 0x123 },
+ { }
+ };
+ MODULE_DEVICE_TABLE(mcb, foo_ids);
+
+ static struct mcb_driver foo_driver = {
+ driver = {
+ .name = "foo-bar",
+ .owner = THIS_MODULE,
+ },
+ .probe = foo_probe,
+ .remove = foo_remove,
+ .id_table = foo_ids,
+ };
+
+Probing and attaching
+---------------------
+
+When a driver is loaded and the MCB devices it services are found, the MCB
+core will call the driver's probe callback method. When the driver is removed
+from the system, the MCB core will call the driver's remove callback method::
+
+ static init foo_probe(struct mcb_device *mdev, const struct mcb_device_id *id);
+ static void foo_remove(struct mcb_device *mdev);
+
+Initializing the driver
+-----------------------
+
+When the kernel is booted or your foo driver module is inserted, you have to
+perform driver initialization. Usually it is enough to register your driver
+module at the MCB core::
+
+ static int __init foo_init(void)
+ {
+ return mcb_register_driver(&foo_driver);
+ }
+ module_init(foo_init);
+
+ static void __exit foo_exit(void)
+ {
+ mcb_unregister_driver(&foo_driver);
+ }
+ module_exit(foo_exit);
+
+The module_mcb_driver() macro can be used to reduce the above code::
+
+ module_mcb_driver(foo_driver);
+
+Using DMA
+---------
+
+To make use of the kernel's DMA-API's function, you will need to use the
+carrier device's 'struct device'. Fortunately 'struct mcb_device' embeds a
+pointer (->dma_dev) to the carrier's device for DMA purposes::
+
+ ret = dma_set_mask_and_coherent(&mdev->dma_dev, DMA_BIT_MASK(dma_bits));
+ if (rc)
+ /* Handle errors */
diff --git a/Documentation/driver-api/message-based.rst b/Documentation/driver-api/message-based.rst
new file mode 100644
index 0000000000..18ff94ef6d
--- /dev/null
+++ b/Documentation/driver-api/message-based.rst
@@ -0,0 +1,12 @@
+Message-based devices
+=====================
+
+Fusion message devices
+----------------------
+
+.. kernel-doc:: drivers/message/fusion/mptbase.c
+ :export:
+
+.. kernel-doc:: drivers/message/fusion/mptscsih.c
+ :export:
+
diff --git a/Documentation/driver-api/misc_devices.rst b/Documentation/driver-api/misc_devices.rst
new file mode 100644
index 0000000000..c7ee7b02ba
--- /dev/null
+++ b/Documentation/driver-api/misc_devices.rst
@@ -0,0 +1,5 @@
+Miscellaneous Devices
+=====================
+
+.. kernel-doc:: drivers/char/misc.c
+ :export:
diff --git a/Documentation/driver-api/miscellaneous.rst b/Documentation/driver-api/miscellaneous.rst
new file mode 100644
index 0000000000..4a5104a368
--- /dev/null
+++ b/Documentation/driver-api/miscellaneous.rst
@@ -0,0 +1,48 @@
+Parallel Port Devices
+=====================
+
+.. kernel-doc:: include/linux/parport.h
+ :internal:
+
+.. kernel-doc:: drivers/parport/ieee1284.c
+ :export:
+
+.. kernel-doc:: drivers/parport/share.c
+ :export:
+
+.. kernel-doc:: drivers/parport/daisy.c
+ :internal:
+
+16x50 UART Driver
+=================
+
+.. kernel-doc:: drivers/tty/serial/8250/8250_core.c
+ :export:
+
+See serial/driver.rst for related APIs.
+
+Pulse-Width Modulation (PWM)
+============================
+
+Pulse-width modulation is a modulation technique primarily used to
+control power supplied to electrical devices.
+
+The PWM framework provides an abstraction for providers and consumers of
+PWM signals. A controller that provides one or more PWM signals is
+registered as :c:type:`struct pwm_chip <pwm_chip>`. Providers
+are expected to embed this structure in a driver-specific structure.
+This structure contains fields that describe a particular chip.
+
+A chip exposes one or more PWM signal sources, each of which exposed as
+a :c:type:`struct pwm_device <pwm_device>`. Operations can be
+performed on PWM devices to control the period, duty cycle, polarity and
+active state of the signal.
+
+Note that PWM devices are exclusive resources: they can always only be
+used by one consumer at a time.
+
+.. kernel-doc:: include/linux/pwm.h
+ :internal:
+
+.. kernel-doc:: drivers/pwm/core.c
+ :export:
diff --git a/Documentation/driver-api/mmc/index.rst b/Documentation/driver-api/mmc/index.rst
new file mode 100644
index 0000000000..7339736ac7
--- /dev/null
+++ b/Documentation/driver-api/mmc/index.rst
@@ -0,0 +1,13 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+========================
+MMC/SD/SDIO card support
+========================
+
+.. toctree::
+ :maxdepth: 1
+
+ mmc-dev-attrs
+ mmc-dev-parts
+ mmc-async-req
+ mmc-tools
diff --git a/Documentation/driver-api/mmc/mmc-async-req.rst b/Documentation/driver-api/mmc/mmc-async-req.rst
new file mode 100644
index 0000000000..0f7197c9c3
--- /dev/null
+++ b/Documentation/driver-api/mmc/mmc-async-req.rst
@@ -0,0 +1,98 @@
+========================
+MMC Asynchronous Request
+========================
+
+Rationale
+=========
+
+How significant is the cache maintenance overhead?
+
+It depends. Fast eMMC and multiple cache levels with speculative cache
+pre-fetch makes the cache overhead relatively significant. If the DMA
+preparations for the next request are done in parallel with the current
+transfer, the DMA preparation overhead would not affect the MMC performance.
+
+The intention of non-blocking (asynchronous) MMC requests is to minimize the
+time between when an MMC request ends and another MMC request begins.
+
+Using mmc_wait_for_req(), the MMC controller is idle while dma_map_sg and
+dma_unmap_sg are processing. Using non-blocking MMC requests makes it
+possible to prepare the caches for next job in parallel with an active
+MMC request.
+
+MMC block driver
+================
+
+The mmc_blk_issue_rw_rq() in the MMC block driver is made non-blocking.
+
+The increase in throughput is proportional to the time it takes to
+prepare (major part of preparations are dma_map_sg() and dma_unmap_sg())
+a request and how fast the memory is. The faster the MMC/SD is the
+more significant the prepare request time becomes. Roughly the expected
+performance gain is 5% for large writes and 10% on large reads on a L2 cache
+platform. In power save mode, when clocks run on a lower frequency, the DMA
+preparation may cost even more. As long as these slower preparations are run
+in parallel with the transfer performance won't be affected.
+
+Details on measurements from IOZone and mmc_test
+================================================
+
+https://wiki.linaro.org/WorkingGroups/Kernel/Specs/StoragePerfMMC-async-req
+
+MMC core API extension
+======================
+
+There is one new public function mmc_start_req().
+
+It starts a new MMC command request for a host. The function isn't
+truly non-blocking. If there is an ongoing async request it waits
+for completion of that request and starts the new one and returns. It
+doesn't wait for the new request to complete. If there is no ongoing
+request it starts the new request and returns immediately.
+
+MMC host extensions
+===================
+
+There are two optional members in the mmc_host_ops -- pre_req() and
+post_req() -- that the host driver may implement in order to move work
+to before and after the actual mmc_host_ops.request() function is called.
+
+In the DMA case pre_req() may do dma_map_sg() and prepare the DMA
+descriptor, and post_req() runs the dma_unmap_sg().
+
+Optimize for the first request
+==============================
+
+The first request in a series of requests can't be prepared in parallel
+with the previous transfer, since there is no previous request.
+
+The argument is_first_req in pre_req() indicates that there is no previous
+request. The host driver may optimize for this scenario to minimize
+the performance loss. A way to optimize for this is to split the current
+request in two chunks, prepare the first chunk and start the request,
+and finally prepare the second chunk and start the transfer.
+
+Pseudocode to handle is_first_req scenario with minimal prepare overhead::
+
+ if (is_first_req && req->size > threshold)
+ /* start MMC transfer for the complete transfer size */
+ mmc_start_command(MMC_CMD_TRANSFER_FULL_SIZE);
+
+ /*
+ * Begin to prepare DMA while cmd is being processed by MMC.
+ * The first chunk of the request should take the same time
+ * to prepare as the "MMC process command time".
+ * If prepare time exceeds MMC cmd time
+ * the transfer is delayed, guesstimate max 4k as first chunk size.
+ */
+ prepare_1st_chunk_for_dma(req);
+ /* flush pending desc to the DMAC (dmaengine.h) */
+ dma_issue_pending(req->dma_desc);
+
+ prepare_2nd_chunk_for_dma(req);
+ /*
+ * The second issue_pending should be called before MMC runs out
+ * of the first chunk. If the MMC runs out of the first data chunk
+ * before this call, the transfer is delayed.
+ */
+ dma_issue_pending(req->dma_desc);
diff --git a/Documentation/driver-api/mmc/mmc-dev-attrs.rst b/Documentation/driver-api/mmc/mmc-dev-attrs.rst
new file mode 100644
index 0000000000..4f44b1b730
--- /dev/null
+++ b/Documentation/driver-api/mmc/mmc-dev-attrs.rst
@@ -0,0 +1,91 @@
+==================================
+SD and MMC Block Device Attributes
+==================================
+
+These attributes are defined for the block devices associated with the
+SD or MMC device.
+
+The following attributes are read/write.
+
+ ======== ===============================================
+ force_ro Enforce read-only access even if write protect switch is off.
+ ======== ===============================================
+
+SD and MMC Device Attributes
+============================
+
+All attributes are read-only.
+
+ ====================== ===============================================
+ cid Card Identification Register
+ csd Card Specific Data Register
+ scr SD Card Configuration Register (SD only)
+ date Manufacturing Date (from CID Register)
+ fwrev Firmware/Product Revision (from CID Register)
+ (SD and MMCv1 only)
+ hwrev Hardware/Product Revision (from CID Register)
+ (SD and MMCv1 only)
+ manfid Manufacturer ID (from CID Register)
+ name Product Name (from CID Register)
+ oemid OEM/Application ID (from CID Register)
+ prv Product Revision (from CID Register)
+ (SD and MMCv4 only)
+ serial Product Serial Number (from CID Register)
+ erase_size Erase group size
+ preferred_erase_size Preferred erase size
+ raw_rpmb_size_mult RPMB partition size
+ rel_sectors Reliable write sector count
+ ocr Operation Conditions Register
+ dsr Driver Stage Register
+ cmdq_en Command Queue enabled:
+
+ 1 => enabled, 0 => not enabled
+ ====================== ===============================================
+
+Note on Erase Size and Preferred Erase Size:
+
+ "erase_size" is the minimum size, in bytes, of an erase
+ operation. For MMC, "erase_size" is the erase group size
+ reported by the card. Note that "erase_size" does not apply
+ to trim or secure trim operations where the minimum size is
+ always one 512 byte sector. For SD, "erase_size" is 512
+ if the card is block-addressed, 0 otherwise.
+
+ SD/MMC cards can erase an arbitrarily large area up to and
+ including the whole card. When erasing a large area it may
+ be desirable to do it in smaller chunks for three reasons:
+
+ 1. A single erase command will make all other I/O on
+ the card wait. This is not a problem if the whole card
+ is being erased, but erasing one partition will make
+ I/O for another partition on the same card wait for the
+ duration of the erase - which could be a several
+ minutes.
+ 2. To be able to inform the user of erase progress.
+ 3. The erase timeout becomes too large to be very
+ useful. Because the erase timeout contains a margin
+ which is multiplied by the size of the erase area,
+ the value can end up being several minutes for large
+ areas.
+
+ "erase_size" is not the most efficient unit to erase
+ (especially for SD where it is just one sector),
+ hence "preferred_erase_size" provides a good chunk
+ size for erasing large areas.
+
+ For MMC, "preferred_erase_size" is the high-capacity
+ erase size if a card specifies one, otherwise it is
+ based on the capacity of the card.
+
+ For SD, "preferred_erase_size" is the allocation unit
+ size specified by the card.
+
+ "preferred_erase_size" is in bytes.
+
+Note on raw_rpmb_size_mult:
+
+ "raw_rpmb_size_mult" is a multiple of 128kB block.
+
+ RPMB size in byte is calculated by using the following equation:
+
+ RPMB partition size = 128kB x raw_rpmb_size_mult
diff --git a/Documentation/driver-api/mmc/mmc-dev-parts.rst b/Documentation/driver-api/mmc/mmc-dev-parts.rst
new file mode 100644
index 0000000000..995922f1f7
--- /dev/null
+++ b/Documentation/driver-api/mmc/mmc-dev-parts.rst
@@ -0,0 +1,41 @@
+============================
+SD and MMC Device Partitions
+============================
+
+Device partitions are additional logical block devices present on the
+SD/MMC device.
+
+As of this writing, MMC boot partitions as supported and exposed as
+/dev/mmcblkXboot0 and /dev/mmcblkXboot1, where X is the index of the
+parent /dev/mmcblkX.
+
+MMC Boot Partitions
+===================
+
+Read and write access is provided to the two MMC boot partitions. Due to
+the sensitive nature of the boot partition contents, which often store
+a bootloader or bootloader configuration tables crucial to booting the
+platform, write access is disabled by default to reduce the chance of
+accidental bricking.
+
+To enable write access to /dev/mmcblkXbootY, disable the forced read-only
+access with::
+
+ echo 0 > /sys/block/mmcblkXbootY/force_ro
+
+To re-enable read-only access::
+
+ echo 1 > /sys/block/mmcblkXbootY/force_ro
+
+The boot partitions can also be locked read only until the next power on,
+with::
+
+ echo 1 > /sys/block/mmcblkXbootY/ro_lock_until_next_power_on
+
+This is a feature of the card and not of the kernel. If the card does
+not support boot partition locking, the file will not exist. If the
+feature has been disabled on the card, the file will be read-only.
+
+The boot partitions can also be locked permanently, but this feature is
+not accessible through sysfs in order to avoid accidental or malicious
+bricking.
diff --git a/Documentation/driver-api/mmc/mmc-tools.rst b/Documentation/driver-api/mmc/mmc-tools.rst
new file mode 100644
index 0000000000..eee1c2ccfa
--- /dev/null
+++ b/Documentation/driver-api/mmc/mmc-tools.rst
@@ -0,0 +1,37 @@
+======================
+MMC tools introduction
+======================
+
+There is one MMC test tools called mmc-utils, which is maintained by Ulf Hansson,
+you can find it at the below public git repository:
+
+ https://git.kernel.org/pub/scm/utils/mmc/mmc-utils.git
+
+Functions
+=========
+
+The mmc-utils tools can do the following:
+
+ - Print and parse extcsd data.
+ - Determine the eMMC writeprotect status.
+ - Set the eMMC writeprotect status.
+ - Set the eMMC data sector size to 4KB by disabling emulation.
+ - Create general purpose partition.
+ - Enable the enhanced user area.
+ - Enable write reliability per partition.
+ - Print the response to STATUS_SEND (CMD13).
+ - Enable the boot partition.
+ - Set Boot Bus Conditions.
+ - Enable the eMMC BKOPS feature.
+ - Permanently enable the eMMC H/W Reset feature.
+ - Permanently disable the eMMC H/W Reset feature.
+ - Send Sanitize command.
+ - Program authentication key for the device.
+ - Counter value for the rpmb device will be read to stdout.
+ - Read from rpmb device to output.
+ - Write to rpmb device from data file.
+ - Enable the eMMC cache feature.
+ - Disable the eMMC cache feature.
+ - Print and parse CID data.
+ - Print and parse CSD data.
+ - Print and parse SCR data.
diff --git a/Documentation/driver-api/mtd/index.rst b/Documentation/driver-api/mtd/index.rst
new file mode 100644
index 0000000000..6a4278f409
--- /dev/null
+++ b/Documentation/driver-api/mtd/index.rst
@@ -0,0 +1,12 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============================
+Memory Technology Device (MTD)
+==============================
+
+.. toctree::
+ :maxdepth: 1
+
+ spi-intel
+ nand_ecc
+ spi-nor
diff --git a/Documentation/driver-api/mtd/nand_ecc.rst b/Documentation/driver-api/mtd/nand_ecc.rst
new file mode 100644
index 0000000000..74347c14a7
--- /dev/null
+++ b/Documentation/driver-api/mtd/nand_ecc.rst
@@ -0,0 +1,763 @@
+==========================
+NAND Error-correction Code
+==========================
+
+Introduction
+============
+
+Having looked at the linux mtd/nand Hamming software ECC engine driver
+I felt there was room for optimisation. I bashed the code for a few hours
+performing tricks like table lookup removing superfluous code etc.
+After that the speed was increased by 35-40%.
+Still I was not too happy as I felt there was additional room for improvement.
+
+Bad! I was hooked.
+I decided to annotate my steps in this file. Perhaps it is useful to someone
+or someone learns something from it.
+
+
+The problem
+===========
+
+NAND flash (at least SLC one) typically has sectors of 256 bytes.
+However NAND flash is not extremely reliable so some error detection
+(and sometimes correction) is needed.
+
+This is done by means of a Hamming code. I'll try to explain it in
+laymans terms (and apologies to all the pro's in the field in case I do
+not use the right terminology, my coding theory class was almost 30
+years ago, and I must admit it was not one of my favourites).
+
+As I said before the ecc calculation is performed on sectors of 256
+bytes. This is done by calculating several parity bits over the rows and
+columns. The parity used is even parity which means that the parity bit = 1
+if the data over which the parity is calculated is 1 and the parity bit = 0
+if the data over which the parity is calculated is 0. So the total
+number of bits over the data over which the parity is calculated + the
+parity bit is even. (see wikipedia if you can't follow this).
+Parity is often calculated by means of an exclusive or operation,
+sometimes also referred to as xor. In C the operator for xor is ^
+
+Back to ecc.
+Let's give a small figure:
+
+========= ==== ==== ==== ==== ==== ==== ==== ==== === === === === ====
+byte 0: bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 rp0 rp2 rp4 ... rp14
+byte 1: bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 rp1 rp2 rp4 ... rp14
+byte 2: bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 rp0 rp3 rp4 ... rp14
+byte 3: bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 rp1 rp3 rp4 ... rp14
+byte 4: bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 rp0 rp2 rp5 ... rp14
+...
+byte 254: bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 rp0 rp3 rp5 ... rp15
+byte 255: bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 rp1 rp3 rp5 ... rp15
+ cp1 cp0 cp1 cp0 cp1 cp0 cp1 cp0
+ cp3 cp3 cp2 cp2 cp3 cp3 cp2 cp2
+ cp5 cp5 cp5 cp5 cp4 cp4 cp4 cp4
+========= ==== ==== ==== ==== ==== ==== ==== ==== === === === === ====
+
+This figure represents a sector of 256 bytes.
+cp is my abbreviation for column parity, rp for row parity.
+
+Let's start to explain column parity.
+
+- cp0 is the parity that belongs to all bit0, bit2, bit4, bit6.
+
+ so the sum of all bit0, bit2, bit4 and bit6 values + cp0 itself is even.
+
+Similarly cp1 is the sum of all bit1, bit3, bit5 and bit7.
+
+- cp2 is the parity over bit0, bit1, bit4 and bit5
+- cp3 is the parity over bit2, bit3, bit6 and bit7.
+- cp4 is the parity over bit0, bit1, bit2 and bit3.
+- cp5 is the parity over bit4, bit5, bit6 and bit7.
+
+Note that each of cp0 .. cp5 is exactly one bit.
+
+Row parity actually works almost the same.
+
+- rp0 is the parity of all even bytes (0, 2, 4, 6, ... 252, 254)
+- rp1 is the parity of all odd bytes (1, 3, 5, 7, ..., 253, 255)
+- rp2 is the parity of all bytes 0, 1, 4, 5, 8, 9, ...
+ (so handle two bytes, then skip 2 bytes).
+- rp3 is covers the half rp2 does not cover (bytes 2, 3, 6, 7, 10, 11, ...)
+- for rp4 the rule is cover 4 bytes, skip 4 bytes, cover 4 bytes, skip 4 etc.
+
+ so rp4 calculates parity over bytes 0, 1, 2, 3, 8, 9, 10, 11, 16, ...)
+- and rp5 covers the other half, so bytes 4, 5, 6, 7, 12, 13, 14, 15, 20, ..
+
+The story now becomes quite boring. I guess you get the idea.
+
+- rp6 covers 8 bytes then skips 8 etc
+- rp7 skips 8 bytes then covers 8 etc
+- rp8 covers 16 bytes then skips 16 etc
+- rp9 skips 16 bytes then covers 16 etc
+- rp10 covers 32 bytes then skips 32 etc
+- rp11 skips 32 bytes then covers 32 etc
+- rp12 covers 64 bytes then skips 64 etc
+- rp13 skips 64 bytes then covers 64 etc
+- rp14 covers 128 bytes then skips 128
+- rp15 skips 128 bytes then covers 128
+
+In the end the parity bits are grouped together in three bytes as
+follows:
+
+===== ===== ===== ===== ===== ===== ===== ===== =====
+ECC Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
+===== ===== ===== ===== ===== ===== ===== ===== =====
+ECC 0 rp07 rp06 rp05 rp04 rp03 rp02 rp01 rp00
+ECC 1 rp15 rp14 rp13 rp12 rp11 rp10 rp09 rp08
+ECC 2 cp5 cp4 cp3 cp2 cp1 cp0 1 1
+===== ===== ===== ===== ===== ===== ===== ===== =====
+
+I detected after writing this that ST application note AN1823
+(http://www.st.com/stonline/) gives a much
+nicer picture.(but they use line parity as term where I use row parity)
+Oh well, I'm graphically challenged, so suffer with me for a moment :-)
+
+And I could not reuse the ST picture anyway for copyright reasons.
+
+
+Attempt 0
+=========
+
+Implementing the parity calculation is pretty simple.
+In C pseudocode::
+
+ for (i = 0; i < 256; i++)
+ {
+ if (i & 0x01)
+ rp1 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp1;
+ else
+ rp0 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp0;
+ if (i & 0x02)
+ rp3 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp3;
+ else
+ rp2 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp2;
+ if (i & 0x04)
+ rp5 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp5;
+ else
+ rp4 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp4;
+ if (i & 0x08)
+ rp7 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp7;
+ else
+ rp6 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp6;
+ if (i & 0x10)
+ rp9 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp9;
+ else
+ rp8 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp8;
+ if (i & 0x20)
+ rp11 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp11;
+ else
+ rp10 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp10;
+ if (i & 0x40)
+ rp13 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp13;
+ else
+ rp12 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp12;
+ if (i & 0x80)
+ rp15 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp15;
+ else
+ rp14 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0 ^ rp14;
+ cp0 = bit6 ^ bit4 ^ bit2 ^ bit0 ^ cp0;
+ cp1 = bit7 ^ bit5 ^ bit3 ^ bit1 ^ cp1;
+ cp2 = bit5 ^ bit4 ^ bit1 ^ bit0 ^ cp2;
+ cp3 = bit7 ^ bit6 ^ bit3 ^ bit2 ^ cp3
+ cp4 = bit3 ^ bit2 ^ bit1 ^ bit0 ^ cp4
+ cp5 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ cp5
+ }
+
+
+Analysis 0
+==========
+
+C does have bitwise operators but not really operators to do the above
+efficiently (and most hardware has no such instructions either).
+Therefore without implementing this it was clear that the code above was
+not going to bring me a Nobel prize :-)
+
+Fortunately the exclusive or operation is commutative, so we can combine
+the values in any order. So instead of calculating all the bits
+individually, let us try to rearrange things.
+For the column parity this is easy. We can just xor the bytes and in the
+end filter out the relevant bits. This is pretty nice as it will bring
+all cp calculation out of the for loop.
+
+Similarly we can first xor the bytes for the various rows.
+This leads to:
+
+
+Attempt 1
+=========
+
+::
+
+ const char parity[256] = {
+ 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
+ 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
+ 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
+ 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
+ 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
+ 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
+ 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
+ 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
+ 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
+ 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
+ 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
+ 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
+ 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
+ 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
+ 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
+ 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0
+ };
+
+ void ecc1(const unsigned char *buf, unsigned char *code)
+ {
+ int i;
+ const unsigned char *bp = buf;
+ unsigned char cur;
+ unsigned char rp0, rp1, rp2, rp3, rp4, rp5, rp6, rp7;
+ unsigned char rp8, rp9, rp10, rp11, rp12, rp13, rp14, rp15;
+ unsigned char par;
+
+ par = 0;
+ rp0 = 0; rp1 = 0; rp2 = 0; rp3 = 0;
+ rp4 = 0; rp5 = 0; rp6 = 0; rp7 = 0;
+ rp8 = 0; rp9 = 0; rp10 = 0; rp11 = 0;
+ rp12 = 0; rp13 = 0; rp14 = 0; rp15 = 0;
+
+ for (i = 0; i < 256; i++)
+ {
+ cur = *bp++;
+ par ^= cur;
+ if (i & 0x01) rp1 ^= cur; else rp0 ^= cur;
+ if (i & 0x02) rp3 ^= cur; else rp2 ^= cur;
+ if (i & 0x04) rp5 ^= cur; else rp4 ^= cur;
+ if (i & 0x08) rp7 ^= cur; else rp6 ^= cur;
+ if (i & 0x10) rp9 ^= cur; else rp8 ^= cur;
+ if (i & 0x20) rp11 ^= cur; else rp10 ^= cur;
+ if (i & 0x40) rp13 ^= cur; else rp12 ^= cur;
+ if (i & 0x80) rp15 ^= cur; else rp14 ^= cur;
+ }
+ code[0] =
+ (parity[rp7] << 7) |
+ (parity[rp6] << 6) |
+ (parity[rp5] << 5) |
+ (parity[rp4] << 4) |
+ (parity[rp3] << 3) |
+ (parity[rp2] << 2) |
+ (parity[rp1] << 1) |
+ (parity[rp0]);
+ code[1] =
+ (parity[rp15] << 7) |
+ (parity[rp14] << 6) |
+ (parity[rp13] << 5) |
+ (parity[rp12] << 4) |
+ (parity[rp11] << 3) |
+ (parity[rp10] << 2) |
+ (parity[rp9] << 1) |
+ (parity[rp8]);
+ code[2] =
+ (parity[par & 0xf0] << 7) |
+ (parity[par & 0x0f] << 6) |
+ (parity[par & 0xcc] << 5) |
+ (parity[par & 0x33] << 4) |
+ (parity[par & 0xaa] << 3) |
+ (parity[par & 0x55] << 2);
+ code[0] = ~code[0];
+ code[1] = ~code[1];
+ code[2] = ~code[2];
+ }
+
+Still pretty straightforward. The last three invert statements are there to
+give a checksum of 0xff 0xff 0xff for an empty flash. In an empty flash
+all data is 0xff, so the checksum then matches.
+
+I also introduced the parity lookup. I expected this to be the fastest
+way to calculate the parity, but I will investigate alternatives later
+on.
+
+
+Analysis 1
+==========
+
+The code works, but is not terribly efficient. On my system it took
+almost 4 times as much time as the linux driver code. But hey, if it was
+*that* easy this would have been done long before.
+No pain. no gain.
+
+Fortunately there is plenty of room for improvement.
+
+In step 1 we moved from bit-wise calculation to byte-wise calculation.
+However in C we can also use the unsigned long data type and virtually
+every modern microprocessor supports 32 bit operations, so why not try
+to write our code in such a way that we process data in 32 bit chunks.
+
+Of course this means some modification as the row parity is byte by
+byte. A quick analysis:
+for the column parity we use the par variable. When extending to 32 bits
+we can in the end easily calculate rp0 and rp1 from it.
+(because par now consists of 4 bytes, contributing to rp1, rp0, rp1, rp0
+respectively, from MSB to LSB)
+also rp2 and rp3 can be easily retrieved from par as rp3 covers the
+first two MSBs and rp2 covers the last two LSBs.
+
+Note that of course now the loop is executed only 64 times (256/4).
+And note that care must taken wrt byte ordering. The way bytes are
+ordered in a long is machine dependent, and might affect us.
+Anyway, if there is an issue: this code is developed on x86 (to be
+precise: a DELL PC with a D920 Intel CPU)
+
+And of course the performance might depend on alignment, but I expect
+that the I/O buffers in the nand driver are aligned properly (and
+otherwise that should be fixed to get maximum performance).
+
+Let's give it a try...
+
+
+Attempt 2
+=========
+
+::
+
+ extern const char parity[256];
+
+ void ecc2(const unsigned char *buf, unsigned char *code)
+ {
+ int i;
+ const unsigned long *bp = (unsigned long *)buf;
+ unsigned long cur;
+ unsigned long rp0, rp1, rp2, rp3, rp4, rp5, rp6, rp7;
+ unsigned long rp8, rp9, rp10, rp11, rp12, rp13, rp14, rp15;
+ unsigned long par;
+
+ par = 0;
+ rp0 = 0; rp1 = 0; rp2 = 0; rp3 = 0;
+ rp4 = 0; rp5 = 0; rp6 = 0; rp7 = 0;
+ rp8 = 0; rp9 = 0; rp10 = 0; rp11 = 0;
+ rp12 = 0; rp13 = 0; rp14 = 0; rp15 = 0;
+
+ for (i = 0; i < 64; i++)
+ {
+ cur = *bp++;
+ par ^= cur;
+ if (i & 0x01) rp5 ^= cur; else rp4 ^= cur;
+ if (i & 0x02) rp7 ^= cur; else rp6 ^= cur;
+ if (i & 0x04) rp9 ^= cur; else rp8 ^= cur;
+ if (i & 0x08) rp11 ^= cur; else rp10 ^= cur;
+ if (i & 0x10) rp13 ^= cur; else rp12 ^= cur;
+ if (i & 0x20) rp15 ^= cur; else rp14 ^= cur;
+ }
+ /*
+ we need to adapt the code generation for the fact that rp vars are now
+ long; also the column parity calculation needs to be changed.
+ we'll bring rp4 to 15 back to single byte entities by shifting and
+ xoring
+ */
+ rp4 ^= (rp4 >> 16); rp4 ^= (rp4 >> 8); rp4 &= 0xff;
+ rp5 ^= (rp5 >> 16); rp5 ^= (rp5 >> 8); rp5 &= 0xff;
+ rp6 ^= (rp6 >> 16); rp6 ^= (rp6 >> 8); rp6 &= 0xff;
+ rp7 ^= (rp7 >> 16); rp7 ^= (rp7 >> 8); rp7 &= 0xff;
+ rp8 ^= (rp8 >> 16); rp8 ^= (rp8 >> 8); rp8 &= 0xff;
+ rp9 ^= (rp9 >> 16); rp9 ^= (rp9 >> 8); rp9 &= 0xff;
+ rp10 ^= (rp10 >> 16); rp10 ^= (rp10 >> 8); rp10 &= 0xff;
+ rp11 ^= (rp11 >> 16); rp11 ^= (rp11 >> 8); rp11 &= 0xff;
+ rp12 ^= (rp12 >> 16); rp12 ^= (rp12 >> 8); rp12 &= 0xff;
+ rp13 ^= (rp13 >> 16); rp13 ^= (rp13 >> 8); rp13 &= 0xff;
+ rp14 ^= (rp14 >> 16); rp14 ^= (rp14 >> 8); rp14 &= 0xff;
+ rp15 ^= (rp15 >> 16); rp15 ^= (rp15 >> 8); rp15 &= 0xff;
+ rp3 = (par >> 16); rp3 ^= (rp3 >> 8); rp3 &= 0xff;
+ rp2 = par & 0xffff; rp2 ^= (rp2 >> 8); rp2 &= 0xff;
+ par ^= (par >> 16);
+ rp1 = (par >> 8); rp1 &= 0xff;
+ rp0 = (par & 0xff);
+ par ^= (par >> 8); par &= 0xff;
+
+ code[0] =
+ (parity[rp7] << 7) |
+ (parity[rp6] << 6) |
+ (parity[rp5] << 5) |
+ (parity[rp4] << 4) |
+ (parity[rp3] << 3) |
+ (parity[rp2] << 2) |
+ (parity[rp1] << 1) |
+ (parity[rp0]);
+ code[1] =
+ (parity[rp15] << 7) |
+ (parity[rp14] << 6) |
+ (parity[rp13] << 5) |
+ (parity[rp12] << 4) |
+ (parity[rp11] << 3) |
+ (parity[rp10] << 2) |
+ (parity[rp9] << 1) |
+ (parity[rp8]);
+ code[2] =
+ (parity[par & 0xf0] << 7) |
+ (parity[par & 0x0f] << 6) |
+ (parity[par & 0xcc] << 5) |
+ (parity[par & 0x33] << 4) |
+ (parity[par & 0xaa] << 3) |
+ (parity[par & 0x55] << 2);
+ code[0] = ~code[0];
+ code[1] = ~code[1];
+ code[2] = ~code[2];
+ }
+
+The parity array is not shown any more. Note also that for these
+examples I kinda deviated from my regular programming style by allowing
+multiple statements on a line, not using { } in then and else blocks
+with only a single statement and by using operators like ^=
+
+
+Analysis 2
+==========
+
+The code (of course) works, and hurray: we are a little bit faster than
+the linux driver code (about 15%). But wait, don't cheer too quickly.
+There is more to be gained.
+If we look at e.g. rp14 and rp15 we see that we either xor our data with
+rp14 or with rp15. However we also have par which goes over all data.
+This means there is no need to calculate rp14 as it can be calculated from
+rp15 through rp14 = par ^ rp15, because par = rp14 ^ rp15;
+(or if desired we can avoid calculating rp15 and calculate it from
+rp14). That is why some places refer to inverse parity.
+Of course the same thing holds for rp4/5, rp6/7, rp8/9, rp10/11 and rp12/13.
+Effectively this means we can eliminate the else clause from the if
+statements. Also we can optimise the calculation in the end a little bit
+by going from long to byte first. Actually we can even avoid the table
+lookups
+
+Attempt 3
+=========
+
+Odd replaced::
+
+ if (i & 0x01) rp5 ^= cur; else rp4 ^= cur;
+ if (i & 0x02) rp7 ^= cur; else rp6 ^= cur;
+ if (i & 0x04) rp9 ^= cur; else rp8 ^= cur;
+ if (i & 0x08) rp11 ^= cur; else rp10 ^= cur;
+ if (i & 0x10) rp13 ^= cur; else rp12 ^= cur;
+ if (i & 0x20) rp15 ^= cur; else rp14 ^= cur;
+
+with::
+
+ if (i & 0x01) rp5 ^= cur;
+ if (i & 0x02) rp7 ^= cur;
+ if (i & 0x04) rp9 ^= cur;
+ if (i & 0x08) rp11 ^= cur;
+ if (i & 0x10) rp13 ^= cur;
+ if (i & 0x20) rp15 ^= cur;
+
+and outside the loop added::
+
+ rp4 = par ^ rp5;
+ rp6 = par ^ rp7;
+ rp8 = par ^ rp9;
+ rp10 = par ^ rp11;
+ rp12 = par ^ rp13;
+ rp14 = par ^ rp15;
+
+And after that the code takes about 30% more time, although the number of
+statements is reduced. This is also reflected in the assembly code.
+
+
+Analysis 3
+==========
+
+Very weird. Guess it has to do with caching or instruction parallellism
+or so. I also tried on an eeePC (Celeron, clocked at 900 Mhz). Interesting
+observation was that this one is only 30% slower (according to time)
+executing the code as my 3Ghz D920 processor.
+
+Well, it was expected not to be easy so maybe instead move to a
+different track: let's move back to the code from attempt2 and do some
+loop unrolling. This will eliminate a few if statements. I'll try
+different amounts of unrolling to see what works best.
+
+
+Attempt 4
+=========
+
+Unrolled the loop 1, 2, 3 and 4 times.
+For 4 the code starts with::
+
+ for (i = 0; i < 4; i++)
+ {
+ cur = *bp++;
+ par ^= cur;
+ rp4 ^= cur;
+ rp6 ^= cur;
+ rp8 ^= cur;
+ rp10 ^= cur;
+ if (i & 0x1) rp13 ^= cur; else rp12 ^= cur;
+ if (i & 0x2) rp15 ^= cur; else rp14 ^= cur;
+ cur = *bp++;
+ par ^= cur;
+ rp5 ^= cur;
+ rp6 ^= cur;
+ ...
+
+
+Analysis 4
+==========
+
+Unrolling once gains about 15%
+
+Unrolling twice keeps the gain at about 15%
+
+Unrolling three times gives a gain of 30% compared to attempt 2.
+
+Unrolling four times gives a marginal improvement compared to unrolling
+three times.
+
+I decided to proceed with a four time unrolled loop anyway. It was my gut
+feeling that in the next steps I would obtain additional gain from it.
+
+The next step was triggered by the fact that par contains the xor of all
+bytes and rp4 and rp5 each contain the xor of half of the bytes.
+So in effect par = rp4 ^ rp5. But as xor is commutative we can also say
+that rp5 = par ^ rp4. So no need to keep both rp4 and rp5 around. We can
+eliminate rp5 (or rp4, but I already foresaw another optimisation).
+The same holds for rp6/7, rp8/9, rp10/11 rp12/13 and rp14/15.
+
+
+Attempt 5
+=========
+
+Effectively so all odd digit rp assignments in the loop were removed.
+This included the else clause of the if statements.
+Of course after the loop we need to correct things by adding code like::
+
+ rp5 = par ^ rp4;
+
+Also the initial assignments (rp5 = 0; etc) could be removed.
+Along the line I also removed the initialisation of rp0/1/2/3.
+
+
+Analysis 5
+==========
+
+Measurements showed this was a good move. The run-time roughly halved
+compared with attempt 4 with 4 times unrolled, and we only require 1/3rd
+of the processor time compared to the current code in the linux kernel.
+
+However, still I thought there was more. I didn't like all the if
+statements. Why not keep a running parity and only keep the last if
+statement. Time for yet another version!
+
+
+Attempt 6
+=========
+
+THe code within the for loop was changed to::
+
+ for (i = 0; i < 4; i++)
+ {
+ cur = *bp++; tmppar = cur; rp4 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp6 ^= tmppar;
+ cur = *bp++; tmppar ^= cur; rp4 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp8 ^= tmppar;
+
+ cur = *bp++; tmppar ^= cur; rp4 ^= cur; rp6 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp6 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp4 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp10 ^= tmppar;
+
+ cur = *bp++; tmppar ^= cur; rp4 ^= cur; rp6 ^= cur; rp8 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp6 ^= cur; rp8 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp4 ^= cur; rp8 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp8 ^= cur;
+
+ cur = *bp++; tmppar ^= cur; rp4 ^= cur; rp6 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp6 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp4 ^= cur;
+ cur = *bp++; tmppar ^= cur;
+
+ par ^= tmppar;
+ if ((i & 0x1) == 0) rp12 ^= tmppar;
+ if ((i & 0x2) == 0) rp14 ^= tmppar;
+ }
+
+As you can see tmppar is used to accumulate the parity within a for
+iteration. In the last 3 statements is added to par and, if needed,
+to rp12 and rp14.
+
+While making the changes I also found that I could exploit that tmppar
+contains the running parity for this iteration. So instead of having:
+rp4 ^= cur; rp6 ^= cur;
+I removed the rp6 ^= cur; statement and did rp6 ^= tmppar; on next
+statement. A similar change was done for rp8 and rp10
+
+
+Analysis 6
+==========
+
+Measuring this code again showed big gain. When executing the original
+linux code 1 million times, this took about 1 second on my system.
+(using time to measure the performance). After this iteration I was back
+to 0.075 sec. Actually I had to decide to start measuring over 10
+million iterations in order not to lose too much accuracy. This one
+definitely seemed to be the jackpot!
+
+There is a little bit more room for improvement though. There are three
+places with statements::
+
+ rp4 ^= cur; rp6 ^= cur;
+
+It seems more efficient to also maintain a variable rp4_6 in the while
+loop; This eliminates 3 statements per loop. Of course after the loop we
+need to correct by adding::
+
+ rp4 ^= rp4_6;
+ rp6 ^= rp4_6
+
+Furthermore there are 4 sequential assignments to rp8. This can be
+encoded slightly more efficiently by saving tmppar before those 4 lines
+and later do rp8 = rp8 ^ tmppar ^ notrp8;
+(where notrp8 is the value of rp8 before those 4 lines).
+Again a use of the commutative property of xor.
+Time for a new test!
+
+
+Attempt 7
+=========
+
+The new code now looks like::
+
+ for (i = 0; i < 4; i++)
+ {
+ cur = *bp++; tmppar = cur; rp4 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp6 ^= tmppar;
+ cur = *bp++; tmppar ^= cur; rp4 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp8 ^= tmppar;
+
+ cur = *bp++; tmppar ^= cur; rp4_6 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp6 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp4 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp10 ^= tmppar;
+
+ notrp8 = tmppar;
+ cur = *bp++; tmppar ^= cur; rp4_6 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp6 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp4 ^= cur;
+ cur = *bp++; tmppar ^= cur;
+ rp8 = rp8 ^ tmppar ^ notrp8;
+
+ cur = *bp++; tmppar ^= cur; rp4_6 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp6 ^= cur;
+ cur = *bp++; tmppar ^= cur; rp4 ^= cur;
+ cur = *bp++; tmppar ^= cur;
+
+ par ^= tmppar;
+ if ((i & 0x1) == 0) rp12 ^= tmppar;
+ if ((i & 0x2) == 0) rp14 ^= tmppar;
+ }
+ rp4 ^= rp4_6;
+ rp6 ^= rp4_6;
+
+
+Not a big change, but every penny counts :-)
+
+
+Analysis 7
+==========
+
+Actually this made things worse. Not very much, but I don't want to move
+into the wrong direction. Maybe something to investigate later. Could
+have to do with caching again.
+
+Guess that is what there is to win within the loop. Maybe unrolling one
+more time will help. I'll keep the optimisations from 7 for now.
+
+
+Attempt 8
+=========
+
+Unrolled the loop one more time.
+
+
+Analysis 8
+==========
+
+This makes things worse. Let's stick with attempt 6 and continue from there.
+Although it seems that the code within the loop cannot be optimised
+further there is still room to optimize the generation of the ecc codes.
+We can simply calculate the total parity. If this is 0 then rp4 = rp5
+etc. If the parity is 1, then rp4 = !rp5;
+
+But if rp4 = rp5 we do not need rp5 etc. We can just write the even bits
+in the result byte and then do something like::
+
+ code[0] |= (code[0] << 1);
+
+Lets test this.
+
+
+Attempt 9
+=========
+
+Changed the code but again this slightly degrades performance. Tried all
+kind of other things, like having dedicated parity arrays to avoid the
+shift after parity[rp7] << 7; No gain.
+Change the lookup using the parity array by using shift operators (e.g.
+replace parity[rp7] << 7 with::
+
+ rp7 ^= (rp7 << 4);
+ rp7 ^= (rp7 << 2);
+ rp7 ^= (rp7 << 1);
+ rp7 &= 0x80;
+
+No gain.
+
+The only marginal change was inverting the parity bits, so we can remove
+the last three invert statements.
+
+Ah well, pity this does not deliver more. Then again 10 million
+iterations using the linux driver code takes between 13 and 13.5
+seconds, whereas my code now takes about 0.73 seconds for those 10
+million iterations. So basically I've improved the performance by a
+factor 18 on my system. Not that bad. Of course on different hardware
+you will get different results. No warranties!
+
+But of course there is no such thing as a free lunch. The codesize almost
+tripled (from 562 bytes to 1434 bytes). Then again, it is not that much.
+
+
+Correcting errors
+=================
+
+For correcting errors I again used the ST application note as a starter,
+but I also peeked at the existing code.
+
+The algorithm itself is pretty straightforward. Just xor the given and
+the calculated ecc. If all bytes are 0 there is no problem. If 11 bits
+are 1 we have one correctable bit error. If there is 1 bit 1, we have an
+error in the given ecc code.
+
+It proved to be fastest to do some table lookups. Performance gain
+introduced by this is about a factor 2 on my system when a repair had to
+be done, and 1% or so if no repair had to be done.
+
+Code size increased from 330 bytes to 686 bytes for this function.
+(gcc 4.2, -O3)
+
+
+Conclusion
+==========
+
+The gain when calculating the ecc is tremendous. Om my development hardware
+a speedup of a factor of 18 for ecc calculation was achieved. On a test on an
+embedded system with a MIPS core a factor 7 was obtained.
+
+On a test with a Linksys NSLU2 (ARMv5TE processor) the speedup was a factor
+5 (big endian mode, gcc 4.1.2, -O3)
+
+For correction not much gain could be obtained (as bitflips are rare). Then
+again there are also much less cycles spent there.
+
+It seems there is not much more gain possible in this, at least when
+programmed in C. Of course it might be possible to squeeze something more
+out of it with an assembler program, but due to pipeline behaviour etc
+this is very tricky (at least for intel hw).
+
+Author: Frans Meulenbroeks
+
+Copyright (C) 2008 Koninklijke Philips Electronics NV.
diff --git a/Documentation/driver-api/mtd/spi-intel.rst b/Documentation/driver-api/mtd/spi-intel.rst
new file mode 100644
index 0000000000..df854f20ea
--- /dev/null
+++ b/Documentation/driver-api/mtd/spi-intel.rst
@@ -0,0 +1,90 @@
+==============================
+Upgrading BIOS using spi-intel
+==============================
+
+Many Intel CPUs like Baytrail and Braswell include SPI serial flash host
+controller which is used to hold BIOS and other platform specific data.
+Since contents of the SPI serial flash is crucial for machine to function,
+it is typically protected by different hardware protection mechanisms to
+avoid accidental (or on purpose) overwrite of the content.
+
+Not all manufacturers protect the SPI serial flash, mainly because it
+allows upgrading the BIOS image directly from an OS.
+
+The spi-intel driver makes it possible to read and write the SPI serial
+flash, if certain protection bits are not set and locked. If it finds
+any of them set, the whole MTD device is made read-only to prevent
+partial overwrites. By default the driver exposes SPI serial flash
+contents as read-only but it can be changed from kernel command line,
+passing "spi_intel.writeable=1".
+
+Please keep in mind that overwriting the BIOS image on SPI serial flash
+might render the machine unbootable and requires special equipment like
+Dediprog to revive. You have been warned!
+
+Below are the steps how to upgrade MinnowBoard MAX BIOS directly from
+Linux.
+
+ 1) Download and extract the latest Minnowboard MAX BIOS SPI image
+ [1]. At the time writing this the latest image is v92.
+
+ 2) Install mtd-utils package [2]. We need this in order to erase the SPI
+ serial flash. Distros like Debian and Fedora have this prepackaged with
+ name "mtd-utils".
+
+ 3) Add "spi_intel.writeable=1" to the kernel command line and reboot
+ the board (you can also reload the driver passing "writeable=1" as
+ module parameter to modprobe).
+
+ 4) Once the board is up and running again, find the right MTD partition
+ (it is named as "BIOS")::
+
+ # cat /proc/mtd
+ dev: size erasesize name
+ mtd0: 00800000 00001000 "BIOS"
+
+ So here it will be /dev/mtd0 but it may vary.
+
+ 5) Make backup of the existing image first::
+
+ # dd if=/dev/mtd0ro of=bios.bak
+ 16384+0 records in
+ 16384+0 records out
+ 8388608 bytes (8.4 MB) copied, 10.0269 s, 837 kB/s
+
+ 6) Verify the backup::
+
+ # sha1sum /dev/mtd0ro bios.bak
+ fdbb011920572ca6c991377c4b418a0502668b73 /dev/mtd0ro
+ fdbb011920572ca6c991377c4b418a0502668b73 bios.bak
+
+ The SHA1 sums must match. Otherwise do not continue any further!
+
+ 7) Erase the SPI serial flash. After this step, do not reboot the
+ board! Otherwise it will not start anymore::
+
+ # flash_erase /dev/mtd0 0 0
+ Erasing 4 Kibyte @ 7ff000 -- 100 % complete
+
+ 8) Once completed without errors you can write the new BIOS image::
+
+ # dd if=MNW2MAX1.X64.0092.R01.1605221712.bin of=/dev/mtd0
+
+ 9) Verify that the new content of the SPI serial flash matches the new
+ BIOS image::
+
+ # sha1sum /dev/mtd0ro MNW2MAX1.X64.0092.R01.1605221712.bin
+ 9b4df9e4be2057fceec3a5529ec3d950836c87a2 /dev/mtd0ro
+ 9b4df9e4be2057fceec3a5529ec3d950836c87a2 MNW2MAX1.X64.0092.R01.1605221712.bin
+
+ The SHA1 sums should match.
+
+ 10) Now you can reboot your board and observe the new BIOS starting up
+ properly.
+
+References
+----------
+
+[1] https://firmware.intel.com/sites/default/files/MinnowBoard%2EMAX_%2EX64%2E92%2ER01%2Ezip
+
+[2] http://www.linux-mtd.infradead.org/
diff --git a/Documentation/driver-api/mtd/spi-nor.rst b/Documentation/driver-api/mtd/spi-nor.rst
new file mode 100644
index 0000000000..c22f8c0f79
--- /dev/null
+++ b/Documentation/driver-api/mtd/spi-nor.rst
@@ -0,0 +1,65 @@
+=================
+SPI NOR framework
+=================
+
+Part I - Why do we need this framework?
+---------------------------------------
+
+SPI bus controllers (drivers/spi/) only deal with streams of bytes; the bus
+controller operates agnostic of the specific device attached. However, some
+controllers (such as Freescale's QuadSPI controller) cannot easily handle
+arbitrary streams of bytes, but rather are designed specifically for SPI NOR.
+
+In particular, Freescale's QuadSPI controller must know the NOR commands to
+find the right LUT sequence. Unfortunately, the SPI subsystem has no notion of
+opcodes, addresses, or data payloads; a SPI controller simply knows to send or
+receive bytes (Tx and Rx). Therefore, we must define a new layering scheme under
+which the controller driver is aware of the opcodes, addressing, and other
+details of the SPI NOR protocol.
+
+Part II - How does the framework work?
+--------------------------------------
+
+This framework just adds a new layer between the MTD and the SPI bus driver.
+With this new layer, the SPI NOR controller driver does not depend on the
+m25p80 code anymore.
+
+Before this framework, the layer is like::
+
+ MTD
+ ------------------------
+ m25p80
+ ------------------------
+ SPI bus driver
+ ------------------------
+ SPI NOR chip
+
+After this framework, the layer is like::
+
+ MTD
+ ------------------------
+ SPI NOR framework
+ ------------------------
+ m25p80
+ ------------------------
+ SPI bus driver
+ ------------------------
+ SPI NOR chip
+
+With the SPI NOR controller driver (Freescale QuadSPI), it looks like::
+
+ MTD
+ ------------------------
+ SPI NOR framework
+ ------------------------
+ fsl-quadSPI
+ ------------------------
+ SPI NOR chip
+
+Part III - How can drivers use the framework?
+---------------------------------------------
+
+The main API is spi_nor_scan(). Before you call the hook, a driver should
+initialize the necessary fields for spi_nor{}. Please see
+drivers/mtd/spi-nor/spi-nor.c for detail. Please also refer to spi-fsl-qspi.c
+when you want to write a new driver for a SPI NOR controller.
diff --git a/Documentation/driver-api/mtdnand.rst b/Documentation/driver-api/mtdnand.rst
new file mode 100644
index 0000000000..ce77e024c4
--- /dev/null
+++ b/Documentation/driver-api/mtdnand.rst
@@ -0,0 +1,1006 @@
+=====================================
+MTD NAND Driver Programming Interface
+=====================================
+
+:Author: Thomas Gleixner
+
+Introduction
+============
+
+The generic NAND driver supports almost all NAND and AG-AND based chips
+and connects them to the Memory Technology Devices (MTD) subsystem of
+the Linux Kernel.
+
+This documentation is provided for developers who want to implement
+board drivers or filesystem drivers suitable for NAND devices.
+
+Known Bugs And Assumptions
+==========================
+
+None.
+
+Documentation hints
+===================
+
+The function and structure docs are autogenerated. Each function and
+struct member has a short description which is marked with an [XXX]
+identifier. The following chapters explain the meaning of those
+identifiers.
+
+Function identifiers [XXX]
+--------------------------
+
+The functions are marked with [XXX] identifiers in the short comment.
+The identifiers explain the usage and scope of the functions. Following
+identifiers are used:
+
+- [MTD Interface]
+
+ These functions provide the interface to the MTD kernel API. They are
+ not replaceable and provide functionality which is complete hardware
+ independent.
+
+- [NAND Interface]
+
+ These functions are exported and provide the interface to the NAND
+ kernel API.
+
+- [GENERIC]
+
+ Generic functions are not replaceable and provide functionality which
+ is complete hardware independent.
+
+- [DEFAULT]
+
+ Default functions provide hardware related functionality which is
+ suitable for most of the implementations. These functions can be
+ replaced by the board driver if necessary. Those functions are called
+ via pointers in the NAND chip description structure. The board driver
+ can set the functions which should be replaced by board dependent
+ functions before calling nand_scan(). If the function pointer is
+ NULL on entry to nand_scan() then the pointer is set to the default
+ function which is suitable for the detected chip type.
+
+Struct member identifiers [XXX]
+-------------------------------
+
+The struct members are marked with [XXX] identifiers in the comment. The
+identifiers explain the usage and scope of the members. Following
+identifiers are used:
+
+- [INTERN]
+
+ These members are for NAND driver internal use only and must not be
+ modified. Most of these values are calculated from the chip geometry
+ information which is evaluated during nand_scan().
+
+- [REPLACEABLE]
+
+ Replaceable members hold hardware related functions which can be
+ provided by the board driver. The board driver can set the functions
+ which should be replaced by board dependent functions before calling
+ nand_scan(). If the function pointer is NULL on entry to
+ nand_scan() then the pointer is set to the default function which is
+ suitable for the detected chip type.
+
+- [BOARDSPECIFIC]
+
+ Board specific members hold hardware related information which must
+ be provided by the board driver. The board driver must set the
+ function pointers and datafields before calling nand_scan().
+
+- [OPTIONAL]
+
+ Optional members can hold information relevant for the board driver.
+ The generic NAND driver code does not use this information.
+
+Basic board driver
+==================
+
+For most boards it will be sufficient to provide just the basic
+functions and fill out some really board dependent members in the nand
+chip description structure.
+
+Basic defines
+-------------
+
+At least you have to provide a nand_chip structure and a storage for
+the ioremap'ed chip address. You can allocate the nand_chip structure
+using kmalloc or you can allocate it statically. The NAND chip structure
+embeds an mtd structure which will be registered to the MTD subsystem.
+You can extract a pointer to the mtd structure from a nand_chip pointer
+using the nand_to_mtd() helper.
+
+Kmalloc based example
+
+::
+
+ static struct mtd_info *board_mtd;
+ static void __iomem *baseaddr;
+
+
+Static example
+
+::
+
+ static struct nand_chip board_chip;
+ static void __iomem *baseaddr;
+
+
+Partition defines
+-----------------
+
+If you want to divide your device into partitions, then define a
+partitioning scheme suitable to your board.
+
+::
+
+ #define NUM_PARTITIONS 2
+ static struct mtd_partition partition_info[] = {
+ { .name = "Flash partition 1",
+ .offset = 0,
+ .size = 8 * 1024 * 1024 },
+ { .name = "Flash partition 2",
+ .offset = MTDPART_OFS_NEXT,
+ .size = MTDPART_SIZ_FULL },
+ };
+
+
+Hardware control function
+-------------------------
+
+The hardware control function provides access to the control pins of the
+NAND chip(s). The access can be done by GPIO pins or by address lines.
+If you use address lines, make sure that the timing requirements are
+met.
+
+*GPIO based example*
+
+::
+
+ static void board_hwcontrol(struct mtd_info *mtd, int cmd)
+ {
+ switch(cmd){
+ case NAND_CTL_SETCLE: /* Set CLE pin high */ break;
+ case NAND_CTL_CLRCLE: /* Set CLE pin low */ break;
+ case NAND_CTL_SETALE: /* Set ALE pin high */ break;
+ case NAND_CTL_CLRALE: /* Set ALE pin low */ break;
+ case NAND_CTL_SETNCE: /* Set nCE pin low */ break;
+ case NAND_CTL_CLRNCE: /* Set nCE pin high */ break;
+ }
+ }
+
+
+*Address lines based example.* It's assumed that the nCE pin is driven
+by a chip select decoder.
+
+::
+
+ static void board_hwcontrol(struct mtd_info *mtd, int cmd)
+ {
+ struct nand_chip *this = mtd_to_nand(mtd);
+ switch(cmd){
+ case NAND_CTL_SETCLE: this->legacy.IO_ADDR_W |= CLE_ADRR_BIT; break;
+ case NAND_CTL_CLRCLE: this->legacy.IO_ADDR_W &= ~CLE_ADRR_BIT; break;
+ case NAND_CTL_SETALE: this->legacy.IO_ADDR_W |= ALE_ADRR_BIT; break;
+ case NAND_CTL_CLRALE: this->legacy.IO_ADDR_W &= ~ALE_ADRR_BIT; break;
+ }
+ }
+
+
+Device ready function
+---------------------
+
+If the hardware interface has the ready busy pin of the NAND chip
+connected to a GPIO or other accessible I/O pin, this function is used
+to read back the state of the pin. The function has no arguments and
+should return 0, if the device is busy (R/B pin is low) and 1, if the
+device is ready (R/B pin is high). If the hardware interface does not
+give access to the ready busy pin, then the function must not be defined
+and the function pointer this->legacy.dev_ready is set to NULL.
+
+Init function
+-------------
+
+The init function allocates memory and sets up all the board specific
+parameters and function pointers. When everything is set up nand_scan()
+is called. This function tries to detect and identify then chip. If a
+chip is found all the internal data fields are initialized accordingly.
+The structure(s) have to be zeroed out first and then filled with the
+necessary information about the device.
+
+::
+
+ static int __init board_init (void)
+ {
+ struct nand_chip *this;
+ int err = 0;
+
+ /* Allocate memory for MTD device structure and private data */
+ this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
+ if (!this) {
+ printk ("Unable to allocate NAND MTD device structure.\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ board_mtd = nand_to_mtd(this);
+
+ /* map physical address */
+ baseaddr = ioremap(CHIP_PHYSICAL_ADDRESS, 1024);
+ if (!baseaddr) {
+ printk("Ioremap to access NAND chip failed\n");
+ err = -EIO;
+ goto out_mtd;
+ }
+
+ /* Set address of NAND IO lines */
+ this->legacy.IO_ADDR_R = baseaddr;
+ this->legacy.IO_ADDR_W = baseaddr;
+ /* Reference hardware control function */
+ this->hwcontrol = board_hwcontrol;
+ /* Set command delay time, see datasheet for correct value */
+ this->legacy.chip_delay = CHIP_DEPENDEND_COMMAND_DELAY;
+ /* Assign the device ready function, if available */
+ this->legacy.dev_ready = board_dev_ready;
+ this->eccmode = NAND_ECC_SOFT;
+
+ /* Scan to find existence of the device */
+ if (nand_scan (this, 1)) {
+ err = -ENXIO;
+ goto out_ior;
+ }
+
+ add_mtd_partitions(board_mtd, partition_info, NUM_PARTITIONS);
+ goto out;
+
+ out_ior:
+ iounmap(baseaddr);
+ out_mtd:
+ kfree (this);
+ out:
+ return err;
+ }
+ module_init(board_init);
+
+
+Exit function
+-------------
+
+The exit function is only necessary if the driver is compiled as a
+module. It releases all resources which are held by the chip driver and
+unregisters the partitions in the MTD layer.
+
+::
+
+ #ifdef MODULE
+ static void __exit board_cleanup (void)
+ {
+ /* Unregister device */
+ WARN_ON(mtd_device_unregister(board_mtd));
+ /* Release resources */
+ nand_cleanup(mtd_to_nand(board_mtd));
+
+ /* unmap physical address */
+ iounmap(baseaddr);
+
+ /* Free the MTD device structure */
+ kfree (mtd_to_nand(board_mtd));
+ }
+ module_exit(board_cleanup);
+ #endif
+
+
+Advanced board driver functions
+===============================
+
+This chapter describes the advanced functionality of the NAND driver.
+For a list of functions which can be overridden by the board driver see
+the documentation of the nand_chip structure.
+
+Multiple chip control
+---------------------
+
+The nand driver can control chip arrays. Therefore the board driver must
+provide an own select_chip function. This function must (de)select the
+requested chip. The function pointer in the nand_chip structure must be
+set before calling nand_scan(). The maxchip parameter of nand_scan()
+defines the maximum number of chips to scan for. Make sure that the
+select_chip function can handle the requested number of chips.
+
+The nand driver concatenates the chips to one virtual chip and provides
+this virtual chip to the MTD layer.
+
+*Note: The driver can only handle linear chip arrays of equally sized
+chips. There is no support for parallel arrays which extend the
+buswidth.*
+
+*GPIO based example*
+
+::
+
+ static void board_select_chip (struct mtd_info *mtd, int chip)
+ {
+ /* Deselect all chips, set all nCE pins high */
+ GPIO(BOARD_NAND_NCE) |= 0xff;
+ if (chip >= 0)
+ GPIO(BOARD_NAND_NCE) &= ~ (1 << chip);
+ }
+
+
+*Address lines based example.* Its assumed that the nCE pins are
+connected to an address decoder.
+
+::
+
+ static void board_select_chip (struct mtd_info *mtd, int chip)
+ {
+ struct nand_chip *this = mtd_to_nand(mtd);
+
+ /* Deselect all chips */
+ this->legacy.IO_ADDR_R &= ~BOARD_NAND_ADDR_MASK;
+ this->legacy.IO_ADDR_W &= ~BOARD_NAND_ADDR_MASK;
+ switch (chip) {
+ case 0:
+ this->legacy.IO_ADDR_R |= BOARD_NAND_ADDR_CHIP0;
+ this->legacy.IO_ADDR_W |= BOARD_NAND_ADDR_CHIP0;
+ break;
+ ....
+ case n:
+ this->legacy.IO_ADDR_R |= BOARD_NAND_ADDR_CHIPn;
+ this->legacy.IO_ADDR_W |= BOARD_NAND_ADDR_CHIPn;
+ break;
+ }
+ }
+
+
+Hardware ECC support
+--------------------
+
+Functions and constants
+~~~~~~~~~~~~~~~~~~~~~~~
+
+The nand driver supports three different types of hardware ECC.
+
+- NAND_ECC_HW3_256
+
+ Hardware ECC generator providing 3 bytes ECC per 256 byte.
+
+- NAND_ECC_HW3_512
+
+ Hardware ECC generator providing 3 bytes ECC per 512 byte.
+
+- NAND_ECC_HW6_512
+
+ Hardware ECC generator providing 6 bytes ECC per 512 byte.
+
+- NAND_ECC_HW8_512
+
+ Hardware ECC generator providing 8 bytes ECC per 512 byte.
+
+If your hardware generator has a different functionality add it at the
+appropriate place in nand_base.c
+
+The board driver must provide following functions:
+
+- enable_hwecc
+
+ This function is called before reading / writing to the chip. Reset
+ or initialize the hardware generator in this function. The function
+ is called with an argument which let you distinguish between read and
+ write operations.
+
+- calculate_ecc
+
+ This function is called after read / write from / to the chip.
+ Transfer the ECC from the hardware to the buffer. If the option
+ NAND_HWECC_SYNDROME is set then the function is only called on
+ write. See below.
+
+- correct_data
+
+ In case of an ECC error this function is called for error detection
+ and correction. Return 1 respectively 2 in case the error can be
+ corrected. If the error is not correctable return -1. If your
+ hardware generator matches the default algorithm of the nand_ecc
+ software generator then use the correction function provided by
+ nand_ecc instead of implementing duplicated code.
+
+Hardware ECC with syndrome calculation
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Many hardware ECC implementations provide Reed-Solomon codes and
+calculate an error syndrome on read. The syndrome must be converted to a
+standard Reed-Solomon syndrome before calling the error correction code
+in the generic Reed-Solomon library.
+
+The ECC bytes must be placed immediately after the data bytes in order
+to make the syndrome generator work. This is contrary to the usual
+layout used by software ECC. The separation of data and out of band area
+is not longer possible. The nand driver code handles this layout and the
+remaining free bytes in the oob area are managed by the autoplacement
+code. Provide a matching oob-layout in this case. See rts_from4.c and
+diskonchip.c for implementation reference. In those cases we must also
+use bad block tables on FLASH, because the ECC layout is interfering
+with the bad block marker positions. See bad block table support for
+details.
+
+Bad block table support
+-----------------------
+
+Most NAND chips mark the bad blocks at a defined position in the spare
+area. Those blocks must not be erased under any circumstances as the bad
+block information would be lost. It is possible to check the bad block
+mark each time when the blocks are accessed by reading the spare area of
+the first page in the block. This is time consuming so a bad block table
+is used.
+
+The nand driver supports various types of bad block tables.
+
+- Per device
+
+ The bad block table contains all bad block information of the device
+ which can consist of multiple chips.
+
+- Per chip
+
+ A bad block table is used per chip and contains the bad block
+ information for this particular chip.
+
+- Fixed offset
+
+ The bad block table is located at a fixed offset in the chip
+ (device). This applies to various DiskOnChip devices.
+
+- Automatic placed
+
+ The bad block table is automatically placed and detected either at
+ the end or at the beginning of a chip (device)
+
+- Mirrored tables
+
+ The bad block table is mirrored on the chip (device) to allow updates
+ of the bad block table without data loss.
+
+nand_scan() calls the function nand_default_bbt().
+nand_default_bbt() selects appropriate default bad block table
+descriptors depending on the chip information which was retrieved by
+nand_scan().
+
+The standard policy is scanning the device for bad blocks and build a
+ram based bad block table which allows faster access than always
+checking the bad block information on the flash chip itself.
+
+Flash based tables
+~~~~~~~~~~~~~~~~~~
+
+It may be desired or necessary to keep a bad block table in FLASH. For
+AG-AND chips this is mandatory, as they have no factory marked bad
+blocks. They have factory marked good blocks. The marker pattern is
+erased when the block is erased to be reused. So in case of powerloss
+before writing the pattern back to the chip this block would be lost and
+added to the bad blocks. Therefore we scan the chip(s) when we detect
+them the first time for good blocks and store this information in a bad
+block table before erasing any of the blocks.
+
+The blocks in which the tables are stored are protected against
+accidental access by marking them bad in the memory bad block table. The
+bad block table management functions are allowed to circumvent this
+protection.
+
+The simplest way to activate the FLASH based bad block table support is
+to set the option NAND_BBT_USE_FLASH in the bbt_option field of the
+nand chip structure before calling nand_scan(). For AG-AND chips is
+this done by default. This activates the default FLASH based bad block
+table functionality of the NAND driver. The default bad block table
+options are
+
+- Store bad block table per chip
+
+- Use 2 bits per block
+
+- Automatic placement at the end of the chip
+
+- Use mirrored tables with version numbers
+
+- Reserve 4 blocks at the end of the chip
+
+User defined tables
+~~~~~~~~~~~~~~~~~~~
+
+User defined tables are created by filling out a nand_bbt_descr
+structure and storing the pointer in the nand_chip structure member
+bbt_td before calling nand_scan(). If a mirror table is necessary a
+second structure must be created and a pointer to this structure must be
+stored in bbt_md inside the nand_chip structure. If the bbt_md member
+is set to NULL then only the main table is used and no scan for the
+mirrored table is performed.
+
+The most important field in the nand_bbt_descr structure is the
+options field. The options define most of the table properties. Use the
+predefined constants from rawnand.h to define the options.
+
+- Number of bits per block
+
+ The supported number of bits is 1, 2, 4, 8.
+
+- Table per chip
+
+ Setting the constant NAND_BBT_PERCHIP selects that a bad block
+ table is managed for each chip in a chip array. If this option is not
+ set then a per device bad block table is used.
+
+- Table location is absolute
+
+ Use the option constant NAND_BBT_ABSPAGE and define the absolute
+ page number where the bad block table starts in the field pages. If
+ you have selected bad block tables per chip and you have a multi chip
+ array then the start page must be given for each chip in the chip
+ array. Note: there is no scan for a table ident pattern performed, so
+ the fields pattern, veroffs, offs, len can be left uninitialized
+
+- Table location is automatically detected
+
+ The table can either be located in the first or the last good blocks
+ of the chip (device). Set NAND_BBT_LASTBLOCK to place the bad block
+ table at the end of the chip (device). The bad block tables are
+ marked and identified by a pattern which is stored in the spare area
+ of the first page in the block which holds the bad block table. Store
+ a pointer to the pattern in the pattern field. Further the length of
+ the pattern has to be stored in len and the offset in the spare area
+ must be given in the offs member of the nand_bbt_descr structure.
+ For mirrored bad block tables different patterns are mandatory.
+
+- Table creation
+
+ Set the option NAND_BBT_CREATE to enable the table creation if no
+ table can be found during the scan. Usually this is done only once if
+ a new chip is found.
+
+- Table write support
+
+ Set the option NAND_BBT_WRITE to enable the table write support.
+ This allows the update of the bad block table(s) in case a block has
+ to be marked bad due to wear. The MTD interface function
+ block_markbad is calling the update function of the bad block table.
+ If the write support is enabled then the table is updated on FLASH.
+
+ Note: Write support should only be enabled for mirrored tables with
+ version control.
+
+- Table version control
+
+ Set the option NAND_BBT_VERSION to enable the table version
+ control. It's highly recommended to enable this for mirrored tables
+ with write support. It makes sure that the risk of losing the bad
+ block table information is reduced to the loss of the information
+ about the one worn out block which should be marked bad. The version
+ is stored in 4 consecutive bytes in the spare area of the device. The
+ position of the version number is defined by the member veroffs in
+ the bad block table descriptor.
+
+- Save block contents on write
+
+ In case that the block which holds the bad block table does contain
+ other useful information, set the option NAND_BBT_SAVECONTENT. When
+ the bad block table is written then the whole block is read the bad
+ block table is updated and the block is erased and everything is
+ written back. If this option is not set only the bad block table is
+ written and everything else in the block is ignored and erased.
+
+- Number of reserved blocks
+
+ For automatic placement some blocks must be reserved for bad block
+ table storage. The number of reserved blocks is defined in the
+ maxblocks member of the bad block table description structure.
+ Reserving 4 blocks for mirrored tables should be a reasonable number.
+ This also limits the number of blocks which are scanned for the bad
+ block table ident pattern.
+
+Spare area (auto)placement
+--------------------------
+
+The nand driver implements different possibilities for placement of
+filesystem data in the spare area,
+
+- Placement defined by fs driver
+
+- Automatic placement
+
+The default placement function is automatic placement. The nand driver
+has built in default placement schemes for the various chiptypes. If due
+to hardware ECC functionality the default placement does not fit then
+the board driver can provide a own placement scheme.
+
+File system drivers can provide a own placement scheme which is used
+instead of the default placement scheme.
+
+Placement schemes are defined by a nand_oobinfo structure
+
+::
+
+ struct nand_oobinfo {
+ int useecc;
+ int eccbytes;
+ int eccpos[24];
+ int oobfree[8][2];
+ };
+
+
+- useecc
+
+ The useecc member controls the ecc and placement function. The header
+ file include/mtd/mtd-abi.h contains constants to select ecc and
+ placement. MTD_NANDECC_OFF switches off the ecc complete. This is
+ not recommended and available for testing and diagnosis only.
+ MTD_NANDECC_PLACE selects caller defined placement,
+ MTD_NANDECC_AUTOPLACE selects automatic placement.
+
+- eccbytes
+
+ The eccbytes member defines the number of ecc bytes per page.
+
+- eccpos
+
+ The eccpos array holds the byte offsets in the spare area where the
+ ecc codes are placed.
+
+- oobfree
+
+ The oobfree array defines the areas in the spare area which can be
+ used for automatic placement. The information is given in the format
+ {offset, size}. offset defines the start of the usable area, size the
+ length in bytes. More than one area can be defined. The list is
+ terminated by an {0, 0} entry.
+
+Placement defined by fs driver
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The calling function provides a pointer to a nand_oobinfo structure
+which defines the ecc placement. For writes the caller must provide a
+spare area buffer along with the data buffer. The spare area buffer size
+is (number of pages) \* (size of spare area). For reads the buffer size
+is (number of pages) \* ((size of spare area) + (number of ecc steps per
+page) \* sizeof (int)). The driver stores the result of the ecc check
+for each tuple in the spare buffer. The storage sequence is::
+
+ <spare data page 0><ecc result 0>...<ecc result n>
+
+ ...
+
+ <spare data page n><ecc result 0>...<ecc result n>
+
+This is a legacy mode used by YAFFS1.
+
+If the spare area buffer is NULL then only the ECC placement is done
+according to the given scheme in the nand_oobinfo structure.
+
+Automatic placement
+~~~~~~~~~~~~~~~~~~~
+
+Automatic placement uses the built in defaults to place the ecc bytes in
+the spare area. If filesystem data have to be stored / read into the
+spare area then the calling function must provide a buffer. The buffer
+size per page is determined by the oobfree array in the nand_oobinfo
+structure.
+
+If the spare area buffer is NULL then only the ECC placement is done
+according to the default builtin scheme.
+
+Spare area autoplacement default schemes
+----------------------------------------
+
+256 byte pagesize
+~~~~~~~~~~~~~~~~~
+
+======== ================== ===================================================
+Offset Content Comment
+======== ================== ===================================================
+0x00 ECC byte 0 Error correction code byte 0
+0x01 ECC byte 1 Error correction code byte 1
+0x02 ECC byte 2 Error correction code byte 2
+0x03 Autoplace 0
+0x04 Autoplace 1
+0x05 Bad block marker If any bit in this byte is zero, then this
+ block is bad. This applies only to the first
+ page in a block. In the remaining pages this
+ byte is reserved
+0x06 Autoplace 2
+0x07 Autoplace 3
+======== ================== ===================================================
+
+512 byte pagesize
+~~~~~~~~~~~~~~~~~
+
+
+============= ================== ==============================================
+Offset Content Comment
+============= ================== ==============================================
+0x00 ECC byte 0 Error correction code byte 0 of the lower
+ 256 Byte data in this page
+0x01 ECC byte 1 Error correction code byte 1 of the lower
+ 256 Bytes of data in this page
+0x02 ECC byte 2 Error correction code byte 2 of the lower
+ 256 Bytes of data in this page
+0x03 ECC byte 3 Error correction code byte 0 of the upper
+ 256 Bytes of data in this page
+0x04 reserved reserved
+0x05 Bad block marker If any bit in this byte is zero, then this
+ block is bad. This applies only to the first
+ page in a block. In the remaining pages this
+ byte is reserved
+0x06 ECC byte 4 Error correction code byte 1 of the upper
+ 256 Bytes of data in this page
+0x07 ECC byte 5 Error correction code byte 2 of the upper
+ 256 Bytes of data in this page
+0x08 - 0x0F Autoplace 0 - 7
+============= ================== ==============================================
+
+2048 byte pagesize
+~~~~~~~~~~~~~~~~~~
+
+=========== ================== ================================================
+Offset Content Comment
+=========== ================== ================================================
+0x00 Bad block marker If any bit in this byte is zero, then this block
+ is bad. This applies only to the first page in a
+ block. In the remaining pages this byte is
+ reserved
+0x01 Reserved Reserved
+0x02-0x27 Autoplace 0 - 37
+0x28 ECC byte 0 Error correction code byte 0 of the first
+ 256 Byte data in this page
+0x29 ECC byte 1 Error correction code byte 1 of the first
+ 256 Bytes of data in this page
+0x2A ECC byte 2 Error correction code byte 2 of the first
+ 256 Bytes data in this page
+0x2B ECC byte 3 Error correction code byte 0 of the second
+ 256 Bytes of data in this page
+0x2C ECC byte 4 Error correction code byte 1 of the second
+ 256 Bytes of data in this page
+0x2D ECC byte 5 Error correction code byte 2 of the second
+ 256 Bytes of data in this page
+0x2E ECC byte 6 Error correction code byte 0 of the third
+ 256 Bytes of data in this page
+0x2F ECC byte 7 Error correction code byte 1 of the third
+ 256 Bytes of data in this page
+0x30 ECC byte 8 Error correction code byte 2 of the third
+ 256 Bytes of data in this page
+0x31 ECC byte 9 Error correction code byte 0 of the fourth
+ 256 Bytes of data in this page
+0x32 ECC byte 10 Error correction code byte 1 of the fourth
+ 256 Bytes of data in this page
+0x33 ECC byte 11 Error correction code byte 2 of the fourth
+ 256 Bytes of data in this page
+0x34 ECC byte 12 Error correction code byte 0 of the fifth
+ 256 Bytes of data in this page
+0x35 ECC byte 13 Error correction code byte 1 of the fifth
+ 256 Bytes of data in this page
+0x36 ECC byte 14 Error correction code byte 2 of the fifth
+ 256 Bytes of data in this page
+0x37 ECC byte 15 Error correction code byte 0 of the sixth
+ 256 Bytes of data in this page
+0x38 ECC byte 16 Error correction code byte 1 of the sixth
+ 256 Bytes of data in this page
+0x39 ECC byte 17 Error correction code byte 2 of the sixth
+ 256 Bytes of data in this page
+0x3A ECC byte 18 Error correction code byte 0 of the seventh
+ 256 Bytes of data in this page
+0x3B ECC byte 19 Error correction code byte 1 of the seventh
+ 256 Bytes of data in this page
+0x3C ECC byte 20 Error correction code byte 2 of the seventh
+ 256 Bytes of data in this page
+0x3D ECC byte 21 Error correction code byte 0 of the eighth
+ 256 Bytes of data in this page
+0x3E ECC byte 22 Error correction code byte 1 of the eighth
+ 256 Bytes of data in this page
+0x3F ECC byte 23 Error correction code byte 2 of the eighth
+ 256 Bytes of data in this page
+=========== ================== ================================================
+
+Filesystem support
+==================
+
+The NAND driver provides all necessary functions for a filesystem via
+the MTD interface.
+
+Filesystems must be aware of the NAND peculiarities and restrictions.
+One major restrictions of NAND Flash is, that you cannot write as often
+as you want to a page. The consecutive writes to a page, before erasing
+it again, are restricted to 1-3 writes, depending on the manufacturers
+specifications. This applies similar to the spare area.
+
+Therefore NAND aware filesystems must either write in page size chunks
+or hold a writebuffer to collect smaller writes until they sum up to
+pagesize. Available NAND aware filesystems: JFFS2, YAFFS.
+
+The spare area usage to store filesystem data is controlled by the spare
+area placement functionality which is described in one of the earlier
+chapters.
+
+Tools
+=====
+
+The MTD project provides a couple of helpful tools to handle NAND Flash.
+
+- flasherase, flasheraseall: Erase and format FLASH partitions
+
+- nandwrite: write filesystem images to NAND FLASH
+
+- nanddump: dump the contents of a NAND FLASH partitions
+
+These tools are aware of the NAND restrictions. Please use those tools
+instead of complaining about errors which are caused by non NAND aware
+access methods.
+
+Constants
+=========
+
+This chapter describes the constants which might be relevant for a
+driver developer.
+
+Chip option constants
+---------------------
+
+Constants for chip id table
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+These constants are defined in rawnand.h. They are OR-ed together to
+describe the chip functionality::
+
+ /* Buswitdh is 16 bit */
+ #define NAND_BUSWIDTH_16 0x00000002
+ /* Device supports partial programming without padding */
+ #define NAND_NO_PADDING 0x00000004
+ /* Chip has cache program function */
+ #define NAND_CACHEPRG 0x00000008
+ /* Chip has copy back function */
+ #define NAND_COPYBACK 0x00000010
+ /* AND Chip which has 4 banks and a confusing page / block
+ * assignment. See Renesas datasheet for further information */
+ #define NAND_IS_AND 0x00000020
+ /* Chip has a array of 4 pages which can be read without
+ * additional ready /busy waits */
+ #define NAND_4PAGE_ARRAY 0x00000040
+
+
+Constants for runtime options
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+These constants are defined in rawnand.h. They are OR-ed together to
+describe the functionality::
+
+ /* The hw ecc generator provides a syndrome instead a ecc value on read
+ * This can only work if we have the ecc bytes directly behind the
+ * data bytes. Applies for DOC and AG-AND Renesas HW Reed Solomon generators */
+ #define NAND_HWECC_SYNDROME 0x00020000
+
+
+ECC selection constants
+-----------------------
+
+Use these constants to select the ECC algorithm::
+
+ /* No ECC. Usage is not recommended ! */
+ #define NAND_ECC_NONE 0
+ /* Software ECC 3 byte ECC per 256 Byte data */
+ #define NAND_ECC_SOFT 1
+ /* Hardware ECC 3 byte ECC per 256 Byte data */
+ #define NAND_ECC_HW3_256 2
+ /* Hardware ECC 3 byte ECC per 512 Byte data */
+ #define NAND_ECC_HW3_512 3
+ /* Hardware ECC 6 byte ECC per 512 Byte data */
+ #define NAND_ECC_HW6_512 4
+ /* Hardware ECC 8 byte ECC per 512 Byte data */
+ #define NAND_ECC_HW8_512 6
+
+
+Hardware control related constants
+----------------------------------
+
+These constants describe the requested hardware access function when the
+boardspecific hardware control function is called::
+
+ /* Select the chip by setting nCE to low */
+ #define NAND_CTL_SETNCE 1
+ /* Deselect the chip by setting nCE to high */
+ #define NAND_CTL_CLRNCE 2
+ /* Select the command latch by setting CLE to high */
+ #define NAND_CTL_SETCLE 3
+ /* Deselect the command latch by setting CLE to low */
+ #define NAND_CTL_CLRCLE 4
+ /* Select the address latch by setting ALE to high */
+ #define NAND_CTL_SETALE 5
+ /* Deselect the address latch by setting ALE to low */
+ #define NAND_CTL_CLRALE 6
+ /* Set write protection by setting WP to high. Not used! */
+ #define NAND_CTL_SETWP 7
+ /* Clear write protection by setting WP to low. Not used! */
+ #define NAND_CTL_CLRWP 8
+
+
+Bad block table related constants
+---------------------------------
+
+These constants describe the options used for bad block table
+descriptors::
+
+ /* Options for the bad block table descriptors */
+
+ /* The number of bits used per block in the bbt on the device */
+ #define NAND_BBT_NRBITS_MSK 0x0000000F
+ #define NAND_BBT_1BIT 0x00000001
+ #define NAND_BBT_2BIT 0x00000002
+ #define NAND_BBT_4BIT 0x00000004
+ #define NAND_BBT_8BIT 0x00000008
+ /* The bad block table is in the last good block of the device */
+ #define NAND_BBT_LASTBLOCK 0x00000010
+ /* The bbt is at the given page, else we must scan for the bbt */
+ #define NAND_BBT_ABSPAGE 0x00000020
+ /* bbt is stored per chip on multichip devices */
+ #define NAND_BBT_PERCHIP 0x00000080
+ /* bbt has a version counter at offset veroffs */
+ #define NAND_BBT_VERSION 0x00000100
+ /* Create a bbt if none axists */
+ #define NAND_BBT_CREATE 0x00000200
+ /* Write bbt if necessary */
+ #define NAND_BBT_WRITE 0x00001000
+ /* Read and write back block contents when writing bbt */
+ #define NAND_BBT_SAVECONTENT 0x00002000
+
+
+Structures
+==========
+
+This chapter contains the autogenerated documentation of the structures
+which are used in the NAND driver and might be relevant for a driver
+developer. Each struct member has a short description which is marked
+with an [XXX] identifier. See the chapter "Documentation hints" for an
+explanation.
+
+.. kernel-doc:: include/linux/mtd/rawnand.h
+ :internal:
+
+Public Functions Provided
+=========================
+
+This chapter contains the autogenerated documentation of the NAND kernel
+API functions which are exported. Each function has a short description
+which is marked with an [XXX] identifier. See the chapter "Documentation
+hints" for an explanation.
+
+.. kernel-doc:: drivers/mtd/nand/raw/nand_base.c
+ :export:
+
+Internal Functions Provided
+===========================
+
+This chapter contains the autogenerated documentation of the NAND driver
+internal functions. Each function has a short description which is
+marked with an [XXX] identifier. See the chapter "Documentation hints"
+for an explanation. The functions marked with [DEFAULT] might be
+relevant for a board driver developer.
+
+.. kernel-doc:: drivers/mtd/nand/raw/nand_base.c
+ :internal:
+
+.. kernel-doc:: drivers/mtd/nand/raw/nand_bbt.c
+ :internal:
+
+Credits
+=======
+
+The following people have contributed to the NAND driver:
+
+1. Steven J. Hill\ sjhill@realitydiluted.com
+
+2. David Woodhouse\ dwmw2@infradead.org
+
+3. Thomas Gleixner\ tglx@linutronix.de
+
+A lot of users have provided bugfixes, improvements and helping hands
+for testing. Thanks a lot.
+
+The following people have contributed to this document:
+
+1. Thomas Gleixner\ tglx@linutronix.de
diff --git a/Documentation/driver-api/nfc/index.rst b/Documentation/driver-api/nfc/index.rst
new file mode 100644
index 0000000000..b6e9eedbff
--- /dev/null
+++ b/Documentation/driver-api/nfc/index.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+========================
+Near Field Communication
+========================
+
+.. toctree::
+ :maxdepth: 1
+
+ nfc-hci
+ nfc-pn544
diff --git a/Documentation/driver-api/nfc/nfc-hci.rst b/Documentation/driver-api/nfc/nfc-hci.rst
new file mode 100644
index 0000000000..486aa647c4
--- /dev/null
+++ b/Documentation/driver-api/nfc/nfc-hci.rst
@@ -0,0 +1,311 @@
+========================
+HCI backend for NFC Core
+========================
+
+- Author: Eric Lapuyade, Samuel Ortiz
+- Contact: eric.lapuyade@intel.com, samuel.ortiz@intel.com
+
+General
+-------
+
+The HCI layer implements much of the ETSI TS 102 622 V10.2.0 specification. It
+enables easy writing of HCI-based NFC drivers. The HCI layer runs as an NFC Core
+backend, implementing an abstract nfc device and translating NFC Core API
+to HCI commands and events.
+
+HCI
+---
+
+HCI registers as an nfc device with NFC Core. Requests coming from userspace are
+routed through netlink sockets to NFC Core and then to HCI. From this point,
+they are translated in a sequence of HCI commands sent to the HCI layer in the
+host controller (the chip). Commands can be executed synchronously (the sending
+context blocks waiting for response) or asynchronously (the response is returned
+from HCI Rx context).
+HCI events can also be received from the host controller. They will be handled
+and a translation will be forwarded to NFC Core as needed. There are hooks to
+let the HCI driver handle proprietary events or override standard behavior.
+HCI uses 2 execution contexts:
+
+- one for executing commands : nfc_hci_msg_tx_work(). Only one command
+ can be executing at any given moment.
+- one for dispatching received events and commands : nfc_hci_msg_rx_work().
+
+HCI Session initialization
+--------------------------
+
+The Session initialization is an HCI standard which must unfortunately
+support proprietary gates. This is the reason why the driver will pass a list
+of proprietary gates that must be part of the session. HCI will ensure all
+those gates have pipes connected when the hci device is set up.
+In case the chip supports pre-opened gates and pseudo-static pipes, the driver
+can pass that information to HCI core.
+
+HCI Gates and Pipes
+-------------------
+
+A gate defines the 'port' where some service can be found. In order to access
+a service, one must create a pipe to that gate and open it. In this
+implementation, pipes are totally hidden. The public API only knows gates.
+This is consistent with the driver need to send commands to proprietary gates
+without knowing the pipe connected to it.
+
+Driver interface
+----------------
+
+A driver is generally written in two parts : the physical link management and
+the HCI management. This makes it easier to maintain a driver for a chip that
+can be connected using various phy (i2c, spi, ...)
+
+HCI Management
+--------------
+
+A driver would normally register itself with HCI and provide the following
+entry points::
+
+ struct nfc_hci_ops {
+ int (*open)(struct nfc_hci_dev *hdev);
+ void (*close)(struct nfc_hci_dev *hdev);
+ int (*hci_ready) (struct nfc_hci_dev *hdev);
+ int (*xmit) (struct nfc_hci_dev *hdev, struct sk_buff *skb);
+ int (*start_poll) (struct nfc_hci_dev *hdev,
+ u32 im_protocols, u32 tm_protocols);
+ int (*dep_link_up)(struct nfc_hci_dev *hdev, struct nfc_target *target,
+ u8 comm_mode, u8 *gb, size_t gb_len);
+ int (*dep_link_down)(struct nfc_hci_dev *hdev);
+ int (*target_from_gate) (struct nfc_hci_dev *hdev, u8 gate,
+ struct nfc_target *target);
+ int (*complete_target_discovered) (struct nfc_hci_dev *hdev, u8 gate,
+ struct nfc_target *target);
+ int (*im_transceive) (struct nfc_hci_dev *hdev,
+ struct nfc_target *target, struct sk_buff *skb,
+ data_exchange_cb_t cb, void *cb_context);
+ int (*tm_send)(struct nfc_hci_dev *hdev, struct sk_buff *skb);
+ int (*check_presence)(struct nfc_hci_dev *hdev,
+ struct nfc_target *target);
+ int (*event_received)(struct nfc_hci_dev *hdev, u8 gate, u8 event,
+ struct sk_buff *skb);
+ };
+
+- open() and close() shall turn the hardware on and off.
+- hci_ready() is an optional entry point that is called right after the hci
+ session has been set up. The driver can use it to do additional initialization
+ that must be performed using HCI commands.
+- xmit() shall simply write a frame to the physical link.
+- start_poll() is an optional entrypoint that shall set the hardware in polling
+ mode. This must be implemented only if the hardware uses proprietary gates or a
+ mechanism slightly different from the HCI standard.
+- dep_link_up() is called after a p2p target has been detected, to finish
+ the p2p connection setup with hardware parameters that need to be passed back
+ to nfc core.
+- dep_link_down() is called to bring the p2p link down.
+- target_from_gate() is an optional entrypoint to return the nfc protocols
+ corresponding to a proprietary gate.
+- complete_target_discovered() is an optional entry point to let the driver
+ perform additional proprietary processing necessary to auto activate the
+ discovered target.
+- im_transceive() must be implemented by the driver if proprietary HCI commands
+ are required to send data to the tag. Some tag types will require custom
+ commands, others can be written to using the standard HCI commands. The driver
+ can check the tag type and either do proprietary processing, or return 1 to ask
+ for standard processing. The data exchange command itself must be sent
+ asynchronously.
+- tm_send() is called to send data in the case of a p2p connection
+- check_presence() is an optional entry point that will be called regularly
+ by the core to check that an activated tag is still in the field. If this is
+ not implemented, the core will not be able to push tag_lost events to the user
+ space
+- event_received() is called to handle an event coming from the chip. Driver
+ can handle the event or return 1 to let HCI attempt standard processing.
+
+On the rx path, the driver is responsible to push incoming HCP frames to HCI
+using nfc_hci_recv_frame(). HCI will take care of re-aggregation and handling
+This must be done from a context that can sleep.
+
+PHY Management
+--------------
+
+The physical link (i2c, ...) management is defined by the following structure::
+
+ struct nfc_phy_ops {
+ int (*write)(void *dev_id, struct sk_buff *skb);
+ int (*enable)(void *dev_id);
+ void (*disable)(void *dev_id);
+ };
+
+enable():
+ turn the phy on (power on), make it ready to transfer data
+disable():
+ turn the phy off
+write():
+ Send a data frame to the chip. Note that to enable higher
+ layers such as an llc to store the frame for re-emission, this
+ function must not alter the skb. It must also not return a positive
+ result (return 0 for success, negative for failure).
+
+Data coming from the chip shall be sent directly to nfc_hci_recv_frame().
+
+LLC
+---
+
+Communication between the CPU and the chip often requires some link layer
+protocol. Those are isolated as modules managed by the HCI layer. There are
+currently two modules : nop (raw transfer) and shdlc.
+A new llc must implement the following functions::
+
+ struct nfc_llc_ops {
+ void *(*init) (struct nfc_hci_dev *hdev, xmit_to_drv_t xmit_to_drv,
+ rcv_to_hci_t rcv_to_hci, int tx_headroom,
+ int tx_tailroom, int *rx_headroom, int *rx_tailroom,
+ llc_failure_t llc_failure);
+ void (*deinit) (struct nfc_llc *llc);
+ int (*start) (struct nfc_llc *llc);
+ int (*stop) (struct nfc_llc *llc);
+ void (*rcv_from_drv) (struct nfc_llc *llc, struct sk_buff *skb);
+ int (*xmit_from_hci) (struct nfc_llc *llc, struct sk_buff *skb);
+ };
+
+init():
+ allocate and init your private storage
+deinit():
+ cleanup
+start():
+ establish the logical connection
+stop ():
+ terminate the logical connection
+rcv_from_drv():
+ handle data coming from the chip, going to HCI
+xmit_from_hci():
+ handle data sent by HCI, going to the chip
+
+The llc must be registered with nfc before it can be used. Do that by
+calling::
+
+ nfc_llc_register(const char *name, const struct nfc_llc_ops *ops);
+
+Again, note that the llc does not handle the physical link. It is thus very
+easy to mix any physical link with any llc for a given chip driver.
+
+Included Drivers
+----------------
+
+An HCI based driver for an NXP PN544, connected through I2C bus, and using
+shdlc is included.
+
+Execution Contexts
+------------------
+
+The execution contexts are the following:
+- IRQ handler (IRQH):
+fast, cannot sleep. sends incoming frames to HCI where they are passed to
+the current llc. In case of shdlc, the frame is queued in shdlc rx queue.
+
+- SHDLC State Machine worker (SMW)
+
+ Only when llc_shdlc is used: handles shdlc rx & tx queues.
+
+ Dispatches HCI cmd responses.
+
+- HCI Tx Cmd worker (MSGTXWQ)
+
+ Serializes execution of HCI commands.
+
+ Completes execution in case of response timeout.
+
+- HCI Rx worker (MSGRXWQ)
+
+ Dispatches incoming HCI commands or events.
+
+- Syscall context from a userspace call (SYSCALL)
+
+ Any entrypoint in HCI called from NFC Core
+
+Workflow executing an HCI command (using shdlc)
+-----------------------------------------------
+
+Executing an HCI command can easily be performed synchronously using the
+following API::
+
+ int nfc_hci_send_cmd (struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
+ const u8 *param, size_t param_len, struct sk_buff **skb)
+
+The API must be invoked from a context that can sleep. Most of the time, this
+will be the syscall context. skb will return the result that was received in
+the response.
+
+Internally, execution is asynchronous. So all this API does is to enqueue the
+HCI command, setup a local wait queue on stack, and wait_event() for completion.
+The wait is not interruptible because it is guaranteed that the command will
+complete after some short timeout anyway.
+
+MSGTXWQ context will then be scheduled and invoke nfc_hci_msg_tx_work().
+This function will dequeue the next pending command and send its HCP fragments
+to the lower layer which happens to be shdlc. It will then start a timer to be
+able to complete the command with a timeout error if no response arrive.
+
+SMW context gets scheduled and invokes nfc_shdlc_sm_work(). This function
+handles shdlc framing in and out. It uses the driver xmit to send frames and
+receives incoming frames in an skb queue filled from the driver IRQ handler.
+SHDLC I(nformation) frames payload are HCP fragments. They are aggregated to
+form complete HCI frames, which can be a response, command, or event.
+
+HCI Responses are dispatched immediately from this context to unblock
+waiting command execution. Response processing involves invoking the completion
+callback that was provided by nfc_hci_msg_tx_work() when it sent the command.
+The completion callback will then wake the syscall context.
+
+It is also possible to execute the command asynchronously using this API::
+
+ static int nfc_hci_execute_cmd_async(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
+ const u8 *param, size_t param_len,
+ data_exchange_cb_t cb, void *cb_context)
+
+The workflow is the same, except that the API call returns immediately, and
+the callback will be called with the result from the SMW context.
+
+Workflow receiving an HCI event or command
+------------------------------------------
+
+HCI commands or events are not dispatched from SMW context. Instead, they are
+queued to HCI rx_queue and will be dispatched from HCI rx worker
+context (MSGRXWQ). This is done this way to allow a cmd or event handler
+to also execute other commands (for example, handling the
+NFC_HCI_EVT_TARGET_DISCOVERED event from PN544 requires to issue an
+ANY_GET_PARAMETER to the reader A gate to get information on the target
+that was discovered).
+
+Typically, such an event will be propagated to NFC Core from MSGRXWQ context.
+
+Error management
+----------------
+
+Errors that occur synchronously with the execution of an NFC Core request are
+simply returned as the execution result of the request. These are easy.
+
+Errors that occur asynchronously (e.g. in a background protocol handling thread)
+must be reported such that upper layers don't stay ignorant that something
+went wrong below and know that expected events will probably never happen.
+Handling of these errors is done as follows:
+
+- driver (pn544) fails to deliver an incoming frame: it stores the error such
+ that any subsequent call to the driver will result in this error. Then it
+ calls the standard nfc_shdlc_recv_frame() with a NULL argument to report the
+ problem above. shdlc stores a EREMOTEIO sticky status, which will trigger
+ SMW to report above in turn.
+
+- SMW is basically a background thread to handle incoming and outgoing shdlc
+ frames. This thread will also check the shdlc sticky status and report to HCI
+ when it discovers it is not able to run anymore because of an unrecoverable
+ error that happened within shdlc or below. If the problem occurs during shdlc
+ connection, the error is reported through the connect completion.
+
+- HCI: if an internal HCI error happens (frame is lost), or HCI is reported an
+ error from a lower layer, HCI will either complete the currently executing
+ command with that error, or notify NFC Core directly if no command is
+ executing.
+
+- NFC Core: when NFC Core is notified of an error from below and polling is
+ active, it will send a tag discovered event with an empty tag list to the user
+ space to let it know that the poll operation will never be able to detect a
+ tag. If polling is not active and the error was sticky, lower levels will
+ return it at next invocation.
diff --git a/Documentation/driver-api/nfc/nfc-pn544.rst b/Documentation/driver-api/nfc/nfc-pn544.rst
new file mode 100644
index 0000000000..6b2d8aae0c
--- /dev/null
+++ b/Documentation/driver-api/nfc/nfc-pn544.rst
@@ -0,0 +1,34 @@
+============================================================================
+Kernel driver for the NXP Semiconductors PN544 Near Field Communication chip
+============================================================================
+
+
+General
+-------
+
+The PN544 is an integrated transmission module for contactless
+communication. The driver goes under drives/nfc/ and is compiled as a
+module named "pn544".
+
+Host Interfaces: I2C, SPI and HSU, this driver supports currently only I2C.
+
+Protocols
+---------
+
+In the normal (HCI) mode and in the firmware update mode read and
+write functions behave a bit differently because the message formats
+or the protocols are different.
+
+In the normal (HCI) mode the protocol used is derived from the ETSI
+HCI specification. The firmware is updated using a specific protocol,
+which is different from HCI.
+
+HCI messages consist of an eight bit header and the message body. The
+header contains the message length. Maximum size for an HCI message is
+33. In HCI mode sent messages are tested for a correct
+checksum. Firmware update messages have the length in the second (MSB)
+and third (LSB) bytes of the message. The maximum FW message length is
+1024 bytes.
+
+For the ETSI HCI specification see
+http://www.etsi.org/WebSite/Technologies/ProtocolSpecification.aspx
diff --git a/Documentation/driver-api/ntb.rst b/Documentation/driver-api/ntb.rst
new file mode 100644
index 0000000000..e991d92b8b
--- /dev/null
+++ b/Documentation/driver-api/ntb.rst
@@ -0,0 +1,263 @@
+===========
+NTB Drivers
+===========
+
+NTB (Non-Transparent Bridge) is a type of PCI-Express bridge chip that connects
+the separate memory systems of two or more computers to the same PCI-Express
+fabric. Existing NTB hardware supports a common feature set: doorbell
+registers and memory translation windows, as well as non common features like
+scratchpad and message registers. Scratchpad registers are read-and-writable
+registers that are accessible from either side of the device, so that peers can
+exchange a small amount of information at a fixed address. Message registers can
+be utilized for the same purpose. Additionally they are provided with
+special status bits to make sure the information isn't rewritten by another
+peer. Doorbell registers provide a way for peers to send interrupt events.
+Memory windows allow translated read and write access to the peer memory.
+
+NTB Core Driver (ntb)
+=====================
+
+The NTB core driver defines an api wrapping the common feature set, and allows
+clients interested in NTB features to discover NTB the devices supported by
+hardware drivers. The term "client" is used here to mean an upper layer
+component making use of the NTB api. The term "driver," or "hardware driver,"
+is used here to mean a driver for a specific vendor and model of NTB hardware.
+
+NTB Client Drivers
+==================
+
+NTB client drivers should register with the NTB core driver. After
+registering, the client probe and remove functions will be called appropriately
+as ntb hardware, or hardware drivers, are inserted and removed. The
+registration uses the Linux Device framework, so it should feel familiar to
+anyone who has written a pci driver.
+
+NTB Typical client driver implementation
+----------------------------------------
+
+Primary purpose of NTB is to share some peace of memory between at least two
+systems. So the NTB device features like Scratchpad/Message registers are
+mainly used to perform the proper memory window initialization. Typically
+there are two types of memory window interfaces supported by the NTB API:
+inbound translation configured on the local ntb port and outbound translation
+configured by the peer, on the peer ntb port. The first type is
+depicted on the next figure::
+
+ Inbound translation:
+
+ Memory: Local NTB Port: Peer NTB Port: Peer MMIO:
+ ____________
+ | dma-mapped |-ntb_mw_set_trans(addr) |
+ | memory | _v____________ | ______________
+ | (addr) |<======| MW xlat addr |<====| MW base addr |<== memory-mapped IO
+ |------------| |--------------| | |--------------|
+
+So typical scenario of the first type memory window initialization looks:
+1) allocate a memory region, 2) put translated address to NTB config,
+3) somehow notify a peer device of performed initialization, 4) peer device
+maps corresponding outbound memory window so to have access to the shared
+memory region.
+
+The second type of interface, that implies the shared windows being
+initialized by a peer device, is depicted on the figure::
+
+ Outbound translation:
+
+ Memory: Local NTB Port: Peer NTB Port: Peer MMIO:
+ ____________ ______________
+ | dma-mapped | | | MW base addr |<== memory-mapped IO
+ | memory | | |--------------|
+ | (addr) |<===================| MW xlat addr |<-ntb_peer_mw_set_trans(addr)
+ |------------| | |--------------|
+
+Typical scenario of the second type interface initialization would be:
+1) allocate a memory region, 2) somehow deliver a translated address to a peer
+device, 3) peer puts the translated address to NTB config, 4) peer device maps
+outbound memory window so to have access to the shared memory region.
+
+As one can see the described scenarios can be combined in one portable
+algorithm.
+
+ Local device:
+ 1) Allocate memory for a shared window
+ 2) Initialize memory window by translated address of the allocated region
+ (it may fail if local memory window initialization is unsupported)
+ 3) Send the translated address and memory window index to a peer device
+
+ Peer device:
+ 1) Initialize memory window with retrieved address of the allocated
+ by another device memory region (it may fail if peer memory window
+ initialization is unsupported)
+ 2) Map outbound memory window
+
+In accordance with this scenario, the NTB Memory Window API can be used as
+follows:
+
+ Local device:
+ 1) ntb_mw_count(pidx) - retrieve number of memory ranges, which can
+ be allocated for memory windows between local device and peer device
+ of port with specified index.
+ 2) ntb_get_align(pidx, midx) - retrieve parameters restricting the
+ shared memory region alignment and size. Then memory can be properly
+ allocated.
+ 3) Allocate physically contiguous memory region in compliance with
+ restrictions retrieved in 2).
+ 4) ntb_mw_set_trans(pidx, midx) - try to set translation address of
+ the memory window with specified index for the defined peer device
+ (it may fail if local translated address setting is not supported)
+ 5) Send translated base address (usually together with memory window
+ number) to the peer device using, for instance, scratchpad or message
+ registers.
+
+ Peer device:
+ 1) ntb_peer_mw_set_trans(pidx, midx) - try to set received from other
+ device (related to pidx) translated address for specified memory
+ window. It may fail if retrieved address, for instance, exceeds
+ maximum possible address or isn't properly aligned.
+ 2) ntb_peer_mw_get_addr(widx) - retrieve MMIO address to map the memory
+ window so to have an access to the shared memory.
+
+Also it is worth to note, that method ntb_mw_count(pidx) should return the
+same value as ntb_peer_mw_count() on the peer with port index - pidx.
+
+NTB Transport Client (ntb\_transport) and NTB Netdev (ntb\_netdev)
+------------------------------------------------------------------
+
+The primary client for NTB is the Transport client, used in tandem with NTB
+Netdev. These drivers function together to create a logical link to the peer,
+across the ntb, to exchange packets of network data. The Transport client
+establishes a logical link to the peer, and creates queue pairs to exchange
+messages and data. The NTB Netdev then creates an ethernet device using a
+Transport queue pair. Network data is copied between socket buffers and the
+Transport queue pair buffer. The Transport client may be used for other things
+besides Netdev, however no other applications have yet been written.
+
+NTB Ping Pong Test Client (ntb\_pingpong)
+-----------------------------------------
+
+The Ping Pong test client serves as a demonstration to exercise the doorbell
+and scratchpad registers of NTB hardware, and as an example simple NTB client.
+Ping Pong enables the link when started, waits for the NTB link to come up, and
+then proceeds to read and write the doorbell scratchpad registers of the NTB.
+The peers interrupt each other using a bit mask of doorbell bits, which is
+shifted by one in each round, to test the behavior of multiple doorbell bits
+and interrupt vectors. The Ping Pong driver also reads the first local
+scratchpad, and writes the value plus one to the first peer scratchpad, each
+round before writing the peer doorbell register.
+
+Module Parameters:
+
+* unsafe - Some hardware has known issues with scratchpad and doorbell
+ registers. By default, Ping Pong will not attempt to exercise such
+ hardware. You may override this behavior at your own risk by setting
+ unsafe=1.
+* delay\_ms - Specify the delay between receiving a doorbell
+ interrupt event and setting the peer doorbell register for the next
+ round.
+* init\_db - Specify the doorbell bits to start new series of rounds. A new
+ series begins once all the doorbell bits have been shifted out of
+ range.
+* dyndbg - It is suggested to specify dyndbg=+p when loading this module, and
+ then to observe debugging output on the console.
+
+NTB Tool Test Client (ntb\_tool)
+--------------------------------
+
+The Tool test client serves for debugging, primarily, ntb hardware and drivers.
+The Tool provides access through debugfs for reading, setting, and clearing the
+NTB doorbell, and reading and writing scratchpads.
+
+The Tool does not currently have any module parameters.
+
+Debugfs Files:
+
+* *debugfs*/ntb\_tool/*hw*/
+ A directory in debugfs will be created for each
+ NTB device probed by the tool. This directory is shortened to *hw*
+ below.
+* *hw*/db
+ This file is used to read, set, and clear the local doorbell. Not
+ all operations may be supported by all hardware. To read the doorbell,
+ read the file. To set the doorbell, write `s` followed by the bits to
+ set (eg: `echo 's 0x0101' > db`). To clear the doorbell, write `c`
+ followed by the bits to clear.
+* *hw*/mask
+ This file is used to read, set, and clear the local doorbell mask.
+ See *db* for details.
+* *hw*/peer\_db
+ This file is used to read, set, and clear the peer doorbell.
+ See *db* for details.
+* *hw*/peer\_mask
+ This file is used to read, set, and clear the peer doorbell
+ mask. See *db* for details.
+* *hw*/spad
+ This file is used to read and write local scratchpads. To read
+ the values of all scratchpads, read the file. To write values, write a
+ series of pairs of scratchpad number and value
+ (eg: `echo '4 0x123 7 0xabc' > spad`
+ # to set scratchpads `4` and `7` to `0x123` and `0xabc`, respectively).
+* *hw*/peer\_spad
+ This file is used to read and write peer scratchpads. See
+ *spad* for details.
+
+NTB MSI Test Client (ntb\_msi\_test)
+------------------------------------
+
+The MSI test client serves to test and debug the MSI library which
+allows for passing MSI interrupts across NTB memory windows. The
+test client is interacted with through the debugfs filesystem:
+
+* *debugfs*/ntb\_msi\_test/*hw*/
+ A directory in debugfs will be created for each
+ NTB device probed by the msi test. This directory is shortened to *hw*
+ below.
+* *hw*/port
+ This file describes the local port number
+* *hw*/irq*_occurrences
+ One occurrences file exists for each interrupt and, when read,
+ returns the number of times the interrupt has been triggered.
+* *hw*/peer*/port
+ This file describes the port number for each peer
+* *hw*/peer*/count
+ This file describes the number of interrupts that can be
+ triggered on each peer
+* *hw*/peer*/trigger
+ Writing an interrupt number (any number less than the value
+ specified in count) will trigger the interrupt on the
+ specified peer. That peer's interrupt's occurrence file
+ should be incremented.
+
+NTB Hardware Drivers
+====================
+
+NTB hardware drivers should register devices with the NTB core driver. After
+registering, clients probe and remove functions will be called.
+
+NTB Intel Hardware Driver (ntb\_hw\_intel)
+------------------------------------------
+
+The Intel hardware driver supports NTB on Xeon and Atom CPUs.
+
+Module Parameters:
+
+* b2b\_mw\_idx
+ If the peer ntb is to be accessed via a memory window, then use
+ this memory window to access the peer ntb. A value of zero or positive
+ starts from the first mw idx, and a negative value starts from the last
+ mw idx. Both sides MUST set the same value here! The default value is
+ `-1`.
+* b2b\_mw\_share
+ If the peer ntb is to be accessed via a memory window, and if
+ the memory window is large enough, still allow the client to use the
+ second half of the memory window for address translation to the peer.
+* xeon\_b2b\_usd\_bar2\_addr64
+ If using B2B topology on Xeon hardware, use
+ this 64 bit address on the bus between the NTB devices for the window
+ at BAR2, on the upstream side of the link.
+* xeon\_b2b\_usd\_bar4\_addr64 - See *xeon\_b2b\_bar2\_addr64*.
+* xeon\_b2b\_usd\_bar4\_addr32 - See *xeon\_b2b\_bar2\_addr64*.
+* xeon\_b2b\_usd\_bar5\_addr32 - See *xeon\_b2b\_bar2\_addr64*.
+* xeon\_b2b\_dsd\_bar2\_addr64 - See *xeon\_b2b\_bar2\_addr64*.
+* xeon\_b2b\_dsd\_bar4\_addr64 - See *xeon\_b2b\_bar2\_addr64*.
+* xeon\_b2b\_dsd\_bar4\_addr32 - See *xeon\_b2b\_bar2\_addr64*.
+* xeon\_b2b\_dsd\_bar5\_addr32 - See *xeon\_b2b\_bar2\_addr64*.
diff --git a/Documentation/driver-api/nvdimm/btt.rst b/Documentation/driver-api/nvdimm/btt.rst
new file mode 100644
index 0000000000..107395c042
--- /dev/null
+++ b/Documentation/driver-api/nvdimm/btt.rst
@@ -0,0 +1,285 @@
+=============================
+BTT - Block Translation Table
+=============================
+
+
+1. Introduction
+===============
+
+Persistent memory based storage is able to perform IO at byte (or more
+accurately, cache line) granularity. However, we often want to expose such
+storage as traditional block devices. The block drivers for persistent memory
+will do exactly this. However, they do not provide any atomicity guarantees.
+Traditional SSDs typically provide protection against torn sectors in hardware,
+using stored energy in capacitors to complete in-flight block writes, or perhaps
+in firmware. We don't have this luxury with persistent memory - if a write is in
+progress, and we experience a power failure, the block will contain a mix of old
+and new data. Applications may not be prepared to handle such a scenario.
+
+The Block Translation Table (BTT) provides atomic sector update semantics for
+persistent memory devices, so that applications that rely on sector writes not
+being torn can continue to do so. The BTT manifests itself as a stacked block
+device, and reserves a portion of the underlying storage for its metadata. At
+the heart of it, is an indirection table that re-maps all the blocks on the
+volume. It can be thought of as an extremely simple file system that only
+provides atomic sector updates.
+
+
+2. Static Layout
+================
+
+The underlying storage on which a BTT can be laid out is not limited in any way.
+The BTT, however, splits the available space into chunks of up to 512 GiB,
+called "Arenas".
+
+Each arena follows the same layout for its metadata, and all references in an
+arena are internal to it (with the exception of one field that points to the
+next arena). The following depicts the "On-disk" metadata layout::
+
+
+ Backing Store +-------> Arena
+ +---------------+ | +------------------+
+ | | | | Arena info block |
+ | Arena 0 +---+ | 4K |
+ | 512G | +------------------+
+ | | | |
+ +---------------+ | |
+ | | | |
+ | Arena 1 | | Data Blocks |
+ | 512G | | |
+ | | | |
+ +---------------+ | |
+ | . | | |
+ | . | | |
+ | . | | |
+ | | | |
+ | | | |
+ +---------------+ +------------------+
+ | |
+ | BTT Map |
+ | |
+ | |
+ +------------------+
+ | |
+ | BTT Flog |
+ | |
+ +------------------+
+ | Info block copy |
+ | 4K |
+ +------------------+
+
+
+3. Theory of Operation
+======================
+
+
+a. The BTT Map
+--------------
+
+The map is a simple lookup/indirection table that maps an LBA to an internal
+block. Each map entry is 32 bits. The two most significant bits are special
+flags, and the remaining form the internal block number.
+
+======== =============================================================
+Bit Description
+======== =============================================================
+31 - 30 Error and Zero flags - Used in the following way::
+
+ == == ====================================================
+ 31 30 Description
+ == == ====================================================
+ 0 0 Initial state. Reads return zeroes; Premap = Postmap
+ 0 1 Zero state: Reads return zeroes
+ 1 0 Error state: Reads fail; Writes clear 'E' bit
+ 1 1 Normal Block – has valid postmap
+ == == ====================================================
+
+29 - 0 Mappings to internal 'postmap' blocks
+======== =============================================================
+
+
+Some of the terminology that will be subsequently used:
+
+============ ================================================================
+External LBA LBA as made visible to upper layers.
+ABA Arena Block Address - Block offset/number within an arena
+Premap ABA The block offset into an arena, which was decided upon by range
+ checking the External LBA
+Postmap ABA The block number in the "Data Blocks" area obtained after
+ indirection from the map
+nfree The number of free blocks that are maintained at any given time.
+ This is the number of concurrent writes that can happen to the
+ arena.
+============ ================================================================
+
+
+For example, after adding a BTT, we surface a disk of 1024G. We get a read for
+the external LBA at 768G. This falls into the second arena, and of the 512G
+worth of blocks that this arena contributes, this block is at 256G. Thus, the
+premap ABA is 256G. We now refer to the map, and find out the mapping for block
+'X' (256G) points to block 'Y', say '64'. Thus the postmap ABA is 64.
+
+
+b. The BTT Flog
+---------------
+
+The BTT provides sector atomicity by making every write an "allocating write",
+i.e. Every write goes to a "free" block. A running list of free blocks is
+maintained in the form of the BTT flog. 'Flog' is a combination of the words
+"free list" and "log". The flog contains 'nfree' entries, and an entry contains:
+
+======== =====================================================================
+lba The premap ABA that is being written to
+old_map The old postmap ABA - after 'this' write completes, this will be a
+ free block.
+new_map The new postmap ABA. The map will up updated to reflect this
+ lba->postmap_aba mapping, but we log it here in case we have to
+ recover.
+seq Sequence number to mark which of the 2 sections of this flog entry is
+ valid/newest. It cycles between 01->10->11->01 (binary) under normal
+ operation, with 00 indicating an uninitialized state.
+lba' alternate lba entry
+old_map' alternate old postmap entry
+new_map' alternate new postmap entry
+seq' alternate sequence number.
+======== =====================================================================
+
+Each of the above fields is 32-bit, making one entry 32 bytes. Entries are also
+padded to 64 bytes to avoid cache line sharing or aliasing. Flog updates are
+done such that for any entry being written, it:
+a. overwrites the 'old' section in the entry based on sequence numbers
+b. writes the 'new' section such that the sequence number is written last.
+
+
+c. The concept of lanes
+-----------------------
+
+While 'nfree' describes the number of concurrent IOs an arena can process
+concurrently, 'nlanes' is the number of IOs the BTT device as a whole can
+process::
+
+ nlanes = min(nfree, num_cpus)
+
+A lane number is obtained at the start of any IO, and is used for indexing into
+all the on-disk and in-memory data structures for the duration of the IO. If
+there are more CPUs than the max number of available lanes, than lanes are
+protected by spinlocks.
+
+
+d. In-memory data structure: Read Tracking Table (RTT)
+------------------------------------------------------
+
+Consider a case where we have two threads, one doing reads and the other,
+writes. We can hit a condition where the writer thread grabs a free block to do
+a new IO, but the (slow) reader thread is still reading from it. In other words,
+the reader consulted a map entry, and started reading the corresponding block. A
+writer started writing to the same external LBA, and finished the write updating
+the map for that external LBA to point to its new postmap ABA. At this point the
+internal, postmap block that the reader is (still) reading has been inserted
+into the list of free blocks. If another write comes in for the same LBA, it can
+grab this free block, and start writing to it, causing the reader to read
+incorrect data. To prevent this, we introduce the RTT.
+
+The RTT is a simple, per arena table with 'nfree' entries. Every reader inserts
+into rtt[lane_number], the postmap ABA it is reading, and clears it after the
+read is complete. Every writer thread, after grabbing a free block, checks the
+RTT for its presence. If the postmap free block is in the RTT, it waits till the
+reader clears the RTT entry, and only then starts writing to it.
+
+
+e. In-memory data structure: map locks
+--------------------------------------
+
+Consider a case where two writer threads are writing to the same LBA. There can
+be a race in the following sequence of steps::
+
+ free[lane] = map[premap_aba]
+ map[premap_aba] = postmap_aba
+
+Both threads can update their respective free[lane] with the same old, freed
+postmap_aba. This has made the layout inconsistent by losing a free entry, and
+at the same time, duplicating another free entry for two lanes.
+
+To solve this, we could have a single map lock (per arena) that has to be taken
+before performing the above sequence, but we feel that could be too contentious.
+Instead we use an array of (nfree) map_locks that is indexed by
+(premap_aba modulo nfree).
+
+
+f. Reconstruction from the Flog
+-------------------------------
+
+On startup, we analyze the BTT flog to create our list of free blocks. We walk
+through all the entries, and for each lane, of the set of two possible
+'sections', we always look at the most recent one only (based on the sequence
+number). The reconstruction rules/steps are simple:
+
+- Read map[log_entry.lba].
+- If log_entry.new matches the map entry, then log_entry.old is free.
+- If log_entry.new does not match the map entry, then log_entry.new is free.
+ (This case can only be caused by power-fails/unsafe shutdowns)
+
+
+g. Summarizing - Read and Write flows
+-------------------------------------
+
+Read:
+
+1. Convert external LBA to arena number + pre-map ABA
+2. Get a lane (and take lane_lock)
+3. Read map to get the entry for this pre-map ABA
+4. Enter post-map ABA into RTT[lane]
+5. If TRIM flag set in map, return zeroes, and end IO (go to step 8)
+6. If ERROR flag set in map, end IO with EIO (go to step 8)
+7. Read data from this block
+8. Remove post-map ABA entry from RTT[lane]
+9. Release lane (and lane_lock)
+
+Write:
+
+1. Convert external LBA to Arena number + pre-map ABA
+2. Get a lane (and take lane_lock)
+3. Use lane to index into in-memory free list and obtain a new block, next flog
+ index, next sequence number
+4. Scan the RTT to check if free block is present, and spin/wait if it is.
+5. Write data to this free block
+6. Read map to get the existing post-map ABA entry for this pre-map ABA
+7. Write flog entry: [premap_aba / old postmap_aba / new postmap_aba / seq_num]
+8. Write new post-map ABA into map.
+9. Write old post-map entry into the free list
+10. Calculate next sequence number and write into the free list entry
+11. Release lane (and lane_lock)
+
+
+4. Error Handling
+=================
+
+An arena would be in an error state if any of the metadata is corrupted
+irrecoverably, either due to a bug or a media error. The following conditions
+indicate an error:
+
+- Info block checksum does not match (and recovering from the copy also fails)
+- All internal available blocks are not uniquely and entirely addressed by the
+ sum of mapped blocks and free blocks (from the BTT flog).
+- Rebuilding free list from the flog reveals missing/duplicate/impossible
+ entries
+- A map entry is out of bounds
+
+If any of these error conditions are encountered, the arena is put into a read
+only state using a flag in the info block.
+
+
+5. Usage
+========
+
+The BTT can be set up on any disk (namespace) exposed by the libnvdimm subsystem
+(pmem, or blk mode). The easiest way to set up such a namespace is using the
+'ndctl' utility [1]:
+
+For example, the ndctl command line to setup a btt with a 4k sector size is::
+
+ ndctl create-namespace -f -e namespace0.0 -m sector -l 4k
+
+See ndctl create-namespace --help for more options.
+
+[1]: https://github.com/pmem/ndctl
diff --git a/Documentation/driver-api/nvdimm/firmware-activate.rst b/Documentation/driver-api/nvdimm/firmware-activate.rst
new file mode 100644
index 0000000000..7ee7decbbd
--- /dev/null
+++ b/Documentation/driver-api/nvdimm/firmware-activate.rst
@@ -0,0 +1,86 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==================================
+NVDIMM Runtime Firmware Activation
+==================================
+
+Some persistent memory devices run a firmware locally on the device /
+"DIMM" to perform tasks like media management, capacity provisioning,
+and health monitoring. The process of updating that firmware typically
+involves a reboot because it has implications for in-flight memory
+transactions. However, reboots are disruptive and at least the Intel
+persistent memory platform implementation, described by the Intel ACPI
+DSM specification [1], has added support for activating firmware at
+runtime.
+
+A native sysfs interface is implemented in libnvdimm to allow platform
+to advertise and control their local runtime firmware activation
+capability.
+
+The libnvdimm bus object, ndbusX, implements an ndbusX/firmware/activate
+attribute that shows the state of the firmware activation as one of 'idle',
+'armed', 'overflow', and 'busy'.
+
+- idle:
+ No devices are set / armed to activate firmware
+
+- armed:
+ At least one device is armed
+
+- busy:
+ In the busy state armed devices are in the process of transitioning
+ back to idle and completing an activation cycle.
+
+- overflow:
+ If the platform has a concept of incremental work needed to perform
+ the activation it could be the case that too many DIMMs are armed for
+ activation. In that scenario the potential for firmware activation to
+ timeout is indicated by the 'overflow' state.
+
+The 'ndbusX/firmware/activate' property can be written with a value of
+either 'live', or 'quiesce'. A value of 'quiesce' triggers the kernel to
+run firmware activation from within the equivalent of the hibernation
+'freeze' state where drivers and applications are notified to stop their
+modifications of system memory. A value of 'live' attempts
+firmware activation without this hibernation cycle. The
+'ndbusX/firmware/activate' property will be elided completely if no
+firmware activation capability is detected.
+
+Another property 'ndbusX/firmware/capability' indicates a value of
+'live' or 'quiesce', where 'live' indicates that the firmware
+does not require or inflict any quiesce period on the system to update
+firmware. A capability value of 'quiesce' indicates that firmware does
+expect and injects a quiet period for the memory controller, but 'live'
+may still be written to 'ndbusX/firmware/activate' as an override to
+assume the risk of racing firmware update with in-flight device and
+application activity. The 'ndbusX/firmware/capability' property will be
+elided completely if no firmware activation capability is detected.
+
+The libnvdimm memory-device / DIMM object, nmemX, implements
+'nmemX/firmware/activate' and 'nmemX/firmware/result' attributes to
+communicate the per-device firmware activation state. Similar to the
+'ndbusX/firmware/activate' attribute, the 'nmemX/firmware/activate'
+attribute indicates 'idle', 'armed', or 'busy'. The state transitions
+from 'armed' to 'idle' when the system is prepared to activate firmware,
+firmware staged + state set to armed, and 'ndbusX/firmware/activate' is
+triggered. After that activation event the nmemX/firmware/result
+attribute reflects the state of the last activation as one of:
+
+- none:
+ No runtime activation triggered since the last time the device was reset
+
+- success:
+ The last runtime activation completed successfully.
+
+- fail:
+ The last runtime activation failed for device-specific reasons.
+
+- not_staged:
+ The last runtime activation failed due to a sequencing error of the
+ firmware image not being staged.
+
+- need_reset:
+ Runtime firmware activation failed, but the firmware can still be
+ activated via the legacy method of power-cycling the system.
+
+[1]: https://docs.pmem.io/persistent-memory/
diff --git a/Documentation/driver-api/nvdimm/index.rst b/Documentation/driver-api/nvdimm/index.rst
new file mode 100644
index 0000000000..5863bd04f0
--- /dev/null
+++ b/Documentation/driver-api/nvdimm/index.rst
@@ -0,0 +1,13 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===================================
+Non-Volatile Memory Device (NVDIMM)
+===================================
+
+.. toctree::
+ :maxdepth: 1
+
+ nvdimm
+ btt
+ security
+ firmware-activate
diff --git a/Documentation/driver-api/nvdimm/nvdimm.rst b/Documentation/driver-api/nvdimm/nvdimm.rst
new file mode 100644
index 0000000000..ca16b5acbf
--- /dev/null
+++ b/Documentation/driver-api/nvdimm/nvdimm.rst
@@ -0,0 +1,657 @@
+===============================
+LIBNVDIMM: Non-Volatile Devices
+===============================
+
+libnvdimm - kernel / libndctl - userspace helper library
+
+nvdimm@lists.linux.dev
+
+Version 13
+
+.. contents:
+
+ Glossary
+ Overview
+ Supporting Documents
+ Git Trees
+ LIBNVDIMM PMEM
+ PMEM-REGIONs, Atomic Sectors, and DAX
+ Example NVDIMM Platform
+ LIBNVDIMM Kernel Device Model and LIBNDCTL Userspace API
+ LIBNDCTL: Context
+ libndctl: instantiate a new library context example
+ LIBNVDIMM/LIBNDCTL: Bus
+ libnvdimm: control class device in /sys/class
+ libnvdimm: bus
+ libndctl: bus enumeration example
+ LIBNVDIMM/LIBNDCTL: DIMM (NMEM)
+ libnvdimm: DIMM (NMEM)
+ libndctl: DIMM enumeration example
+ LIBNVDIMM/LIBNDCTL: Region
+ libnvdimm: region
+ libndctl: region enumeration example
+ Why Not Encode the Region Type into the Region Name?
+ How Do I Determine the Major Type of a Region?
+ LIBNVDIMM/LIBNDCTL: Namespace
+ libnvdimm: namespace
+ libndctl: namespace enumeration example
+ libndctl: namespace creation example
+ Why the Term "namespace"?
+ LIBNVDIMM/LIBNDCTL: Block Translation Table "btt"
+ libnvdimm: btt layout
+ libndctl: btt creation example
+ Summary LIBNDCTL Diagram
+
+
+Glossary
+========
+
+PMEM:
+ A system-physical-address range where writes are persistent. A
+ block device composed of PMEM is capable of DAX. A PMEM address range
+ may span an interleave of several DIMMs.
+
+DPA:
+ DIMM Physical Address, is a DIMM-relative offset. With one DIMM in
+ the system there would be a 1:1 system-physical-address:DPA association.
+ Once more DIMMs are added a memory controller interleave must be
+ decoded to determine the DPA associated with a given
+ system-physical-address.
+
+DAX:
+ File system extensions to bypass the page cache and block layer to
+ mmap persistent memory, from a PMEM block device, directly into a
+ process address space.
+
+DSM:
+ Device Specific Method: ACPI method to control specific
+ device - in this case the firmware.
+
+DCR:
+ NVDIMM Control Region Structure defined in ACPI 6 Section 5.2.25.5.
+ It defines a vendor-id, device-id, and interface format for a given DIMM.
+
+BTT:
+ Block Translation Table: Persistent memory is byte addressable.
+ Existing software may have an expectation that the power-fail-atomicity
+ of writes is at least one sector, 512 bytes. The BTT is an indirection
+ table with atomic update semantics to front a PMEM block device
+ driver and present arbitrary atomic sector sizes.
+
+LABEL:
+ Metadata stored on a DIMM device that partitions and identifies
+ (persistently names) capacity allocated to different PMEM namespaces. It
+ also indicates whether an address abstraction like a BTT is applied to
+ the namespace. Note that traditional partition tables, GPT/MBR, are
+ layered on top of a PMEM namespace, or an address abstraction like BTT
+ if present, but partition support is deprecated going forward.
+
+
+Overview
+========
+
+The LIBNVDIMM subsystem provides support for PMEM described by platform
+firmware or a device driver. On ACPI based systems the platform firmware
+conveys persistent memory resource via the ACPI NFIT "NVDIMM Firmware
+Interface Table" in ACPI 6. While the LIBNVDIMM subsystem implementation
+is generic and supports pre-NFIT platforms, it was guided by the
+superset of capabilities need to support this ACPI 6 definition for
+NVDIMM resources. The original implementation supported the
+block-window-aperture capability described in the NFIT, but that support
+has since been abandoned and never shipped in a product.
+
+Supporting Documents
+--------------------
+
+ACPI 6:
+ https://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
+NVDIMM Namespace:
+ https://pmem.io/documents/NVDIMM_Namespace_Spec.pdf
+DSM Interface Example:
+ https://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
+Driver Writer's Guide:
+ https://pmem.io/documents/NVDIMM_Driver_Writers_Guide.pdf
+
+Git Trees
+---------
+
+LIBNVDIMM:
+ https://git.kernel.org/cgit/linux/kernel/git/nvdimm/nvdimm.git
+LIBNDCTL:
+ https://github.com/pmem/ndctl.git
+
+
+LIBNVDIMM PMEM
+==============
+
+Prior to the arrival of the NFIT, non-volatile memory was described to a
+system in various ad-hoc ways. Usually only the bare minimum was
+provided, namely, a single system-physical-address range where writes
+are expected to be durable after a system power loss. Now, the NFIT
+specification standardizes not only the description of PMEM, but also
+platform message-passing entry points for control and configuration.
+
+PMEM (nd_pmem.ko): Drives a system-physical-address range. This range is
+contiguous in system memory and may be interleaved (hardware memory controller
+striped) across multiple DIMMs. When interleaved the platform may optionally
+provide details of which DIMMs are participating in the interleave.
+
+It is worth noting that when the labeling capability is detected (a EFI
+namespace label index block is found), then no block device is created
+by default as userspace needs to do at least one allocation of DPA to
+the PMEM range. In contrast ND_NAMESPACE_IO ranges, once registered,
+can be immediately attached to nd_pmem. This latter mode is called
+label-less or "legacy".
+
+PMEM-REGIONs, Atomic Sectors, and DAX
+-------------------------------------
+
+For the cases where an application or filesystem still needs atomic sector
+update guarantees it can register a BTT on a PMEM device or partition. See
+LIBNVDIMM/NDCTL: Block Translation Table "btt"
+
+
+Example NVDIMM Platform
+=======================
+
+For the remainder of this document the following diagram will be
+referenced for any example sysfs layouts::
+
+
+ (a) (b) DIMM
+ +-------------------+--------+--------+--------+
+ +------+ | pm0.0 | free | pm1.0 | free | 0
+ | imc0 +--+- - - region0- - - +--------+ +--------+
+ +--+---+ | pm0.0 | free | pm1.0 | free | 1
+ | +-------------------+--------v v--------+
+ +--+---+ | |
+ | cpu0 | region1
+ +--+---+ | |
+ | +----------------------------^ ^--------+
+ +--+---+ | free | pm1.0 | free | 2
+ | imc1 +--+----------------------------| +--------+
+ +------+ | free | pm1.0 | free | 3
+ +----------------------------+--------+--------+
+
+In this platform we have four DIMMs and two memory controllers in one
+socket. Each PMEM interleave set is identified by a region device with
+a dynamically assigned id.
+
+ 1. The first portion of DIMM0 and DIMM1 are interleaved as REGION0. A
+ single PMEM namespace is created in the REGION0-SPA-range that spans most
+ of DIMM0 and DIMM1 with a user-specified name of "pm0.0". Some of that
+ interleaved system-physical-address range is left free for
+ another PMEM namespace to be defined.
+
+ 2. In the last portion of DIMM0 and DIMM1 we have an interleaved
+ system-physical-address range, REGION1, that spans those two DIMMs as
+ well as DIMM2 and DIMM3. Some of REGION1 is allocated to a PMEM namespace
+ named "pm1.0".
+
+ This bus is provided by the kernel under the device
+ /sys/devices/platform/nfit_test.0 when the nfit_test.ko module from
+ tools/testing/nvdimm is loaded. This module is a unit test for
+ LIBNVDIMM and the acpi_nfit.ko driver.
+
+
+LIBNVDIMM Kernel Device Model and LIBNDCTL Userspace API
+========================================================
+
+What follows is a description of the LIBNVDIMM sysfs layout and a
+corresponding object hierarchy diagram as viewed through the LIBNDCTL
+API. The example sysfs paths and diagrams are relative to the Example
+NVDIMM Platform which is also the LIBNVDIMM bus used in the LIBNDCTL unit
+test.
+
+LIBNDCTL: Context
+-----------------
+
+Every API call in the LIBNDCTL library requires a context that holds the
+logging parameters and other library instance state. The library is
+based on the libabc template:
+
+ https://git.kernel.org/cgit/linux/kernel/git/kay/libabc.git
+
+LIBNDCTL: instantiate a new library context example
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+::
+
+ struct ndctl_ctx *ctx;
+
+ if (ndctl_new(&ctx) == 0)
+ return ctx;
+ else
+ return NULL;
+
+LIBNVDIMM/LIBNDCTL: Bus
+-----------------------
+
+A bus has a 1:1 relationship with an NFIT. The current expectation for
+ACPI based systems is that there is only ever one platform-global NFIT.
+That said, it is trivial to register multiple NFITs, the specification
+does not preclude it. The infrastructure supports multiple busses and
+we use this capability to test multiple NFIT configurations in the unit
+test.
+
+LIBNVDIMM: control class device in /sys/class
+---------------------------------------------
+
+This character device accepts DSM messages to be passed to DIMM
+identified by its NFIT handle::
+
+ /sys/class/nd/ndctl0
+ |-- dev
+ |-- device -> ../../../ndbus0
+ |-- subsystem -> ../../../../../../../class/nd
+
+
+
+LIBNVDIMM: bus
+--------------
+
+::
+
+ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
+ struct nvdimm_bus_descriptor *nfit_desc);
+
+::
+
+ /sys/devices/platform/nfit_test.0/ndbus0
+ |-- commands
+ |-- nd
+ |-- nfit
+ |-- nmem0
+ |-- nmem1
+ |-- nmem2
+ |-- nmem3
+ |-- power
+ |-- provider
+ |-- region0
+ |-- region1
+ |-- region2
+ |-- region3
+ |-- region4
+ |-- region5
+ |-- uevent
+ `-- wait_probe
+
+LIBNDCTL: bus enumeration example
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Find the bus handle that describes the bus from Example NVDIMM Platform::
+
+ static struct ndctl_bus *get_bus_by_provider(struct ndctl_ctx *ctx,
+ const char *provider)
+ {
+ struct ndctl_bus *bus;
+
+ ndctl_bus_foreach(ctx, bus)
+ if (strcmp(provider, ndctl_bus_get_provider(bus)) == 0)
+ return bus;
+
+ return NULL;
+ }
+
+ bus = get_bus_by_provider(ctx, "nfit_test.0");
+
+
+LIBNVDIMM/LIBNDCTL: DIMM (NMEM)
+-------------------------------
+
+The DIMM device provides a character device for sending commands to
+hardware, and it is a container for LABELs. If the DIMM is defined by
+NFIT then an optional 'nfit' attribute sub-directory is available to add
+NFIT-specifics.
+
+Note that the kernel device name for "DIMMs" is "nmemX". The NFIT
+describes these devices via "Memory Device to System Physical Address
+Range Mapping Structure", and there is no requirement that they actually
+be physical DIMMs, so we use a more generic name.
+
+LIBNVDIMM: DIMM (NMEM)
+^^^^^^^^^^^^^^^^^^^^^^
+
+::
+
+ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
+ const struct attribute_group **groups, unsigned long flags,
+ unsigned long *dsm_mask);
+
+::
+
+ /sys/devices/platform/nfit_test.0/ndbus0
+ |-- nmem0
+ | |-- available_slots
+ | |-- commands
+ | |-- dev
+ | |-- devtype
+ | |-- driver -> ../../../../../bus/nd/drivers/nvdimm
+ | |-- modalias
+ | |-- nfit
+ | | |-- device
+ | | |-- format
+ | | |-- handle
+ | | |-- phys_id
+ | | |-- rev_id
+ | | |-- serial
+ | | `-- vendor
+ | |-- state
+ | |-- subsystem -> ../../../../../bus/nd
+ | `-- uevent
+ |-- nmem1
+ [..]
+
+
+LIBNDCTL: DIMM enumeration example
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Note, in this example we are assuming NFIT-defined DIMMs which are
+identified by an "nfit_handle" a 32-bit value where:
+
+ - Bit 3:0 DIMM number within the memory channel
+ - Bit 7:4 memory channel number
+ - Bit 11:8 memory controller ID
+ - Bit 15:12 socket ID (within scope of a Node controller if node
+ controller is present)
+ - Bit 27:16 Node Controller ID
+ - Bit 31:28 Reserved
+
+::
+
+ static struct ndctl_dimm *get_dimm_by_handle(struct ndctl_bus *bus,
+ unsigned int handle)
+ {
+ struct ndctl_dimm *dimm;
+
+ ndctl_dimm_foreach(bus, dimm)
+ if (ndctl_dimm_get_handle(dimm) == handle)
+ return dimm;
+
+ return NULL;
+ }
+
+ #define DIMM_HANDLE(n, s, i, c, d) \
+ (((n & 0xfff) << 16) | ((s & 0xf) << 12) | ((i & 0xf) << 8) \
+ | ((c & 0xf) << 4) | (d & 0xf))
+
+ dimm = get_dimm_by_handle(bus, DIMM_HANDLE(0, 0, 0, 0, 0));
+
+LIBNVDIMM/LIBNDCTL: Region
+--------------------------
+
+A generic REGION device is registered for each PMEM interleave-set /
+range. Per the example there are 2 PMEM regions on the "nfit_test.0"
+bus. The primary role of regions are to be a container of "mappings". A
+mapping is a tuple of <DIMM, DPA-start-offset, length>.
+
+LIBNVDIMM provides a built-in driver for REGION devices. This driver
+is responsible for all parsing LABELs, if present, and then emitting NAMESPACE
+devices for the nd_pmem driver to consume.
+
+In addition to the generic attributes of "mapping"s, "interleave_ways"
+and "size" the REGION device also exports some convenience attributes.
+"nstype" indicates the integer type of namespace-device this region
+emits, "devtype" duplicates the DEVTYPE variable stored by udev at the
+'add' event, "modalias" duplicates the MODALIAS variable stored by udev
+at the 'add' event, and finally, the optional "spa_index" is provided in
+the case where the region is defined by a SPA.
+
+LIBNVDIMM: region::
+
+ struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
+ struct nd_region_desc *ndr_desc);
+
+::
+
+ /sys/devices/platform/nfit_test.0/ndbus0
+ |-- region0
+ | |-- available_size
+ | |-- btt0
+ | |-- btt_seed
+ | |-- devtype
+ | |-- driver -> ../../../../../bus/nd/drivers/nd_region
+ | |-- init_namespaces
+ | |-- mapping0
+ | |-- mapping1
+ | |-- mappings
+ | |-- modalias
+ | |-- namespace0.0
+ | |-- namespace_seed
+ | |-- numa_node
+ | |-- nfit
+ | | `-- spa_index
+ | |-- nstype
+ | |-- set_cookie
+ | |-- size
+ | |-- subsystem -> ../../../../../bus/nd
+ | `-- uevent
+ |-- region1
+ [..]
+
+LIBNDCTL: region enumeration example
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sample region retrieval routines based on NFIT-unique data like
+"spa_index" (interleave set id).
+
+::
+
+ static struct ndctl_region *get_pmem_region_by_spa_index(struct ndctl_bus *bus,
+ unsigned int spa_index)
+ {
+ struct ndctl_region *region;
+
+ ndctl_region_foreach(bus, region) {
+ if (ndctl_region_get_type(region) != ND_DEVICE_REGION_PMEM)
+ continue;
+ if (ndctl_region_get_spa_index(region) == spa_index)
+ return region;
+ }
+ return NULL;
+ }
+
+
+LIBNVDIMM/LIBNDCTL: Namespace
+-----------------------------
+
+A REGION, after resolving DPA aliasing and LABEL specified boundaries, surfaces
+one or more "namespace" devices. The arrival of a "namespace" device currently
+triggers the nd_pmem driver to load and register a disk/block device.
+
+LIBNVDIMM: namespace
+^^^^^^^^^^^^^^^^^^^^
+
+Here is a sample layout from the 2 major types of NAMESPACE where namespace0.0
+represents DIMM-info-backed PMEM (note that it has a 'uuid' attribute), and
+namespace1.0 represents an anonymous PMEM namespace (note that has no 'uuid'
+attribute due to not support a LABEL)
+
+::
+
+ /sys/devices/platform/nfit_test.0/ndbus0/region0/namespace0.0
+ |-- alt_name
+ |-- devtype
+ |-- dpa_extents
+ |-- force_raw
+ |-- modalias
+ |-- numa_node
+ |-- resource
+ |-- size
+ |-- subsystem -> ../../../../../../bus/nd
+ |-- type
+ |-- uevent
+ `-- uuid
+ /sys/devices/platform/nfit_test.1/ndbus1/region1/namespace1.0
+ |-- block
+ | `-- pmem0
+ |-- devtype
+ |-- driver -> ../../../../../../bus/nd/drivers/pmem
+ |-- force_raw
+ |-- modalias
+ |-- numa_node
+ |-- resource
+ |-- size
+ |-- subsystem -> ../../../../../../bus/nd
+ |-- type
+ `-- uevent
+
+LIBNDCTL: namespace enumeration example
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Namespaces are indexed relative to their parent region, example below.
+These indexes are mostly static from boot to boot, but subsystem makes
+no guarantees in this regard. For a static namespace identifier use its
+'uuid' attribute.
+
+::
+
+ static struct ndctl_namespace
+ *get_namespace_by_id(struct ndctl_region *region, unsigned int id)
+ {
+ struct ndctl_namespace *ndns;
+
+ ndctl_namespace_foreach(region, ndns)
+ if (ndctl_namespace_get_id(ndns) == id)
+ return ndns;
+
+ return NULL;
+ }
+
+LIBNDCTL: namespace creation example
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Idle namespaces are automatically created by the kernel if a given
+region has enough available capacity to create a new namespace.
+Namespace instantiation involves finding an idle namespace and
+configuring it. For the most part the setting of namespace attributes
+can occur in any order, the only constraint is that 'uuid' must be set
+before 'size'. This enables the kernel to track DPA allocations
+internally with a static identifier::
+
+ static int configure_namespace(struct ndctl_region *region,
+ struct ndctl_namespace *ndns,
+ struct namespace_parameters *parameters)
+ {
+ char devname[50];
+
+ snprintf(devname, sizeof(devname), "namespace%d.%d",
+ ndctl_region_get_id(region), paramaters->id);
+
+ ndctl_namespace_set_alt_name(ndns, devname);
+ /* 'uuid' must be set prior to setting size! */
+ ndctl_namespace_set_uuid(ndns, paramaters->uuid);
+ ndctl_namespace_set_size(ndns, paramaters->size);
+ /* unlike pmem namespaces, blk namespaces have a sector size */
+ if (parameters->lbasize)
+ ndctl_namespace_set_sector_size(ndns, parameters->lbasize);
+ ndctl_namespace_enable(ndns);
+ }
+
+
+Why the Term "namespace"?
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+ 1. Why not "volume" for instance? "volume" ran the risk of confusing
+ ND (libnvdimm subsystem) to a volume manager like device-mapper.
+
+ 2. The term originated to describe the sub-devices that can be created
+ within a NVME controller (see the nvme specification:
+ https://www.nvmexpress.org/specifications/), and NFIT namespaces are
+ meant to parallel the capabilities and configurability of
+ NVME-namespaces.
+
+
+LIBNVDIMM/LIBNDCTL: Block Translation Table "btt"
+-------------------------------------------------
+
+A BTT (design document: https://pmem.io/2014/09/23/btt.html) is a
+personality driver for a namespace that fronts entire namespace as an
+'address abstraction'.
+
+LIBNVDIMM: btt layout
+^^^^^^^^^^^^^^^^^^^^^
+
+Every region will start out with at least one BTT device which is the
+seed device. To activate it set the "namespace", "uuid", and
+"sector_size" attributes and then bind the device to the nd_pmem or
+nd_blk driver depending on the region type::
+
+ /sys/devices/platform/nfit_test.1/ndbus0/region0/btt0/
+ |-- namespace
+ |-- delete
+ |-- devtype
+ |-- modalias
+ |-- numa_node
+ |-- sector_size
+ |-- subsystem -> ../../../../../bus/nd
+ |-- uevent
+ `-- uuid
+
+LIBNDCTL: btt creation example
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Similar to namespaces an idle BTT device is automatically created per
+region. Each time this "seed" btt device is configured and enabled a new
+seed is created. Creating a BTT configuration involves two steps of
+finding and idle BTT and assigning it to consume a namespace.
+
+::
+
+ static struct ndctl_btt *get_idle_btt(struct ndctl_region *region)
+ {
+ struct ndctl_btt *btt;
+
+ ndctl_btt_foreach(region, btt)
+ if (!ndctl_btt_is_enabled(btt)
+ && !ndctl_btt_is_configured(btt))
+ return btt;
+
+ return NULL;
+ }
+
+ static int configure_btt(struct ndctl_region *region,
+ struct btt_parameters *parameters)
+ {
+ btt = get_idle_btt(region);
+
+ ndctl_btt_set_uuid(btt, parameters->uuid);
+ ndctl_btt_set_sector_size(btt, parameters->sector_size);
+ ndctl_btt_set_namespace(btt, parameters->ndns);
+ /* turn off raw mode device */
+ ndctl_namespace_disable(parameters->ndns);
+ /* turn on btt access */
+ ndctl_btt_enable(btt);
+ }
+
+Once instantiated a new inactive btt seed device will appear underneath
+the region.
+
+Once a "namespace" is removed from a BTT that instance of the BTT device
+will be deleted or otherwise reset to default values. This deletion is
+only at the device model level. In order to destroy a BTT the "info
+block" needs to be destroyed. Note, that to destroy a BTT the media
+needs to be written in raw mode. By default, the kernel will autodetect
+the presence of a BTT and disable raw mode. This autodetect behavior
+can be suppressed by enabling raw mode for the namespace via the
+ndctl_namespace_set_raw_mode() API.
+
+
+Summary LIBNDCTL Diagram
+------------------------
+
+For the given example above, here is the view of the objects as seen by the
+LIBNDCTL API::
+
+ +---+
+ |CTX|
+ +-+-+
+ |
+ +-------+ |
+ | DIMM0 <-+ | +---------+ +--------------+ +---------------+
+ +-------+ | | +-> REGION0 +---> NAMESPACE0.0 +--> PMEM8 "pm0.0" |
+ | DIMM1 <-+ +-v--+ | +---------+ +--------------+ +---------------+
+ +-------+ +-+BUS0+-| +---------+ +--------------+ +----------------------+
+ | DIMM2 <-+ +----+ +-> REGION1 +---> NAMESPACE1.0 +--> PMEM6 "pm1.0" | BTT1 |
+ +-------+ | | +---------+ +--------------+ +---------------+------+
+ | DIMM3 <-+
+ +-------+
diff --git a/Documentation/driver-api/nvdimm/security.rst b/Documentation/driver-api/nvdimm/security.rst
new file mode 100644
index 0000000000..eb3d35e6a9
--- /dev/null
+++ b/Documentation/driver-api/nvdimm/security.rst
@@ -0,0 +1,143 @@
+===============
+NVDIMM Security
+===============
+
+1. Introduction
+---------------
+
+With the introduction of Intel Device Specific Methods (DSM) v1.8
+specification [1], security DSMs are introduced. The spec added the following
+security DSMs: "get security state", "set passphrase", "disable passphrase",
+"unlock unit", "freeze lock", "secure erase", and "overwrite". A security_ops
+data structure has been added to struct dimm in order to support the security
+operations and generic APIs are exposed to allow vendor neutral operations.
+
+2. Sysfs Interface
+------------------
+The "security" sysfs attribute is provided in the nvdimm sysfs directory. For
+example:
+/sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0012:00/ndbus0/nmem0/security
+
+The "show" attribute of that attribute will display the security state for
+that DIMM. The following states are available: disabled, unlocked, locked,
+frozen, and overwrite. If security is not supported, the sysfs attribute
+will not be visible.
+
+The "store" attribute takes several commands when it is being written to
+in order to support some of the security functionalities:
+update <old_keyid> <new_keyid> - enable or update passphrase.
+disable <keyid> - disable enabled security and remove key.
+freeze - freeze changing of security states.
+erase <keyid> - delete existing user encryption key.
+overwrite <keyid> - wipe the entire nvdimm.
+master_update <keyid> <new_keyid> - enable or update master passphrase.
+master_erase <keyid> - delete existing user encryption key.
+
+3. Key Management
+-----------------
+
+The key is associated to the payload by the DIMM id. For example:
+# cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0012:00/ndbus0/nmem0/nfit/id
+8089-a2-1740-00000133
+The DIMM id would be provided along with the key payload (passphrase) to
+the kernel.
+
+The security keys are managed on the basis of a single key per DIMM. The
+key "passphrase" is expected to be 32bytes long. This is similar to the ATA
+security specification [2]. A key is initially acquired via the request_key()
+kernel API call during nvdimm unlock. It is up to the user to make sure that
+all the keys are in the kernel user keyring for unlock.
+
+A nvdimm encrypted-key of format enc32 has the description format of:
+nvdimm:<bus-provider-specific-unique-id>
+
+See file ``Documentation/security/keys/trusted-encrypted.rst`` for creating
+encrypted-keys of enc32 format. TPM usage with a master trusted key is
+preferred for sealing the encrypted-keys.
+
+4. Unlocking
+------------
+When the DIMMs are being enumerated by the kernel, the kernel will attempt to
+retrieve the key from the kernel user keyring. This is the only time
+a locked DIMM can be unlocked. Once unlocked, the DIMM will remain unlocked
+until reboot. Typically an entity (i.e. shell script) will inject all the
+relevant encrypted-keys into the kernel user keyring during the initramfs phase.
+This provides the unlock function access to all the related keys that contain
+the passphrase for the respective nvdimms. It is also recommended that the
+keys are injected before libnvdimm is loaded by modprobe.
+
+5. Update
+---------
+When doing an update, it is expected that the existing key is removed from
+the kernel user keyring and reinjected as different (old) key. It's irrelevant
+what the key description is for the old key since we are only interested in the
+keyid when doing the update operation. It is also expected that the new key
+is injected with the description format described from earlier in this
+document. The update command written to the sysfs attribute will be with
+the format:
+update <old keyid> <new keyid>
+
+If there is no old keyid due to a security enabling, then a 0 should be
+passed in.
+
+6. Freeze
+---------
+The freeze operation does not require any keys. The security config can be
+frozen by a user with root privilege.
+
+7. Disable
+----------
+The security disable command format is:
+disable <keyid>
+
+An key with the current passphrase payload that is tied to the nvdimm should be
+in the kernel user keyring.
+
+8. Secure Erase
+---------------
+The command format for doing a secure erase is:
+erase <keyid>
+
+An key with the current passphrase payload that is tied to the nvdimm should be
+in the kernel user keyring.
+
+9. Overwrite
+------------
+The command format for doing an overwrite is:
+overwrite <keyid>
+
+Overwrite can be done without a key if security is not enabled. A key serial
+of 0 can be passed in to indicate no key.
+
+The sysfs attribute "security" can be polled to wait on overwrite completion.
+Overwrite can last tens of minutes or more depending on nvdimm size.
+
+An encrypted-key with the current user passphrase that is tied to the nvdimm
+should be injected and its keyid should be passed in via sysfs.
+
+10. Master Update
+-----------------
+The command format for doing a master update is:
+update <old keyid> <new keyid>
+
+The operating mechanism for master update is identical to update except the
+master passphrase key is passed to the kernel. The master passphrase key
+is just another encrypted-key.
+
+This command is only available when security is disabled.
+
+11. Master Erase
+----------------
+The command format for doing a master erase is:
+master_erase <current keyid>
+
+This command has the same operating mechanism as erase except the master
+passphrase key is passed to the kernel. The master passphrase key is just
+another encrypted-key.
+
+This command is only available when the master security is enabled, indicated
+by the extended security status.
+
+[1]: https://pmem.io/documents/NVDIMM_DSM_Interface-V1.8.pdf
+
+[2]: http://www.t13.org/documents/UploadedDocuments/docs2006/e05179r4-ACS-SecurityClarifications.pdf
diff --git a/Documentation/driver-api/nvmem.rst b/Documentation/driver-api/nvmem.rst
new file mode 100644
index 0000000000..de221e91c8
--- /dev/null
+++ b/Documentation/driver-api/nvmem.rst
@@ -0,0 +1,202 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============
+NVMEM Subsystem
+===============
+
+ Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+
+This document explains the NVMEM Framework along with the APIs provided,
+and how to use it.
+
+1. Introduction
+===============
+*NVMEM* is the abbreviation for Non Volatile Memory layer. It is used to
+retrieve configuration of SOC or Device specific data from non volatile
+memories like eeprom, efuses and so on.
+
+Before this framework existed, NVMEM drivers like eeprom were stored in
+drivers/misc, where they all had to duplicate pretty much the same code to
+register a sysfs file, allow in-kernel users to access the content of the
+devices they were driving, etc.
+
+This was also a problem as far as other in-kernel users were involved, since
+the solutions used were pretty much different from one driver to another, there
+was a rather big abstraction leak.
+
+This framework aims at solve these problems. It also introduces DT
+representation for consumer devices to go get the data they require (MAC
+Addresses, SoC/Revision ID, part numbers, and so on) from the NVMEMs.
+
+NVMEM Providers
++++++++++++++++
+
+NVMEM provider refers to an entity that implements methods to initialize, read
+and write the non-volatile memory.
+
+2. Registering/Unregistering the NVMEM provider
+===============================================
+
+A NVMEM provider can register with NVMEM core by supplying relevant
+nvmem configuration to nvmem_register(), on success core would return a valid
+nvmem_device pointer.
+
+nvmem_unregister(nvmem) is used to unregister a previously registered provider.
+
+For example, a simple nvram case::
+
+ static int brcm_nvram_probe(struct platform_device *pdev)
+ {
+ struct nvmem_config config = {
+ .name = "brcm-nvram",
+ .reg_read = brcm_nvram_read,
+ };
+ ...
+ config.dev = &pdev->dev;
+ config.priv = priv;
+ config.size = resource_size(res);
+
+ devm_nvmem_register(&config);
+ }
+
+Users of board files can define and register nvmem cells using the
+nvmem_cell_table struct::
+
+ static struct nvmem_cell_info foo_nvmem_cells[] = {
+ {
+ .name = "macaddr",
+ .offset = 0x7f00,
+ .bytes = ETH_ALEN,
+ }
+ };
+
+ static struct nvmem_cell_table foo_nvmem_cell_table = {
+ .nvmem_name = "i2c-eeprom",
+ .cells = foo_nvmem_cells,
+ .ncells = ARRAY_SIZE(foo_nvmem_cells),
+ };
+
+ nvmem_add_cell_table(&foo_nvmem_cell_table);
+
+Additionally it is possible to create nvmem cell lookup entries and register
+them with the nvmem framework from machine code as shown in the example below::
+
+ static struct nvmem_cell_lookup foo_nvmem_lookup = {
+ .nvmem_name = "i2c-eeprom",
+ .cell_name = "macaddr",
+ .dev_id = "foo_mac.0",
+ .con_id = "mac-address",
+ };
+
+ nvmem_add_cell_lookups(&foo_nvmem_lookup, 1);
+
+NVMEM Consumers
++++++++++++++++
+
+NVMEM consumers are the entities which make use of the NVMEM provider to
+read from and to NVMEM.
+
+3. NVMEM cell based consumer APIs
+=================================
+
+NVMEM cells are the data entries/fields in the NVMEM.
+The NVMEM framework provides 3 APIs to read/write NVMEM cells::
+
+ struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *name);
+ struct nvmem_cell *devm_nvmem_cell_get(struct device *dev, const char *name);
+
+ void nvmem_cell_put(struct nvmem_cell *cell);
+ void devm_nvmem_cell_put(struct device *dev, struct nvmem_cell *cell);
+
+ void *nvmem_cell_read(struct nvmem_cell *cell, ssize_t *len);
+ int nvmem_cell_write(struct nvmem_cell *cell, void *buf, ssize_t len);
+
+`*nvmem_cell_get()` apis will get a reference to nvmem cell for a given id,
+and nvmem_cell_read/write() can then read or write to the cell.
+Once the usage of the cell is finished the consumer should call
+`*nvmem_cell_put()` to free all the allocation memory for the cell.
+
+4. Direct NVMEM device based consumer APIs
+==========================================
+
+In some instances it is necessary to directly read/write the NVMEM.
+To facilitate such consumers NVMEM framework provides below apis::
+
+ struct nvmem_device *nvmem_device_get(struct device *dev, const char *name);
+ struct nvmem_device *devm_nvmem_device_get(struct device *dev,
+ const char *name);
+ struct nvmem_device *nvmem_device_find(void *data,
+ int (*match)(struct device *dev, const void *data));
+ void nvmem_device_put(struct nvmem_device *nvmem);
+ int nvmem_device_read(struct nvmem_device *nvmem, unsigned int offset,
+ size_t bytes, void *buf);
+ int nvmem_device_write(struct nvmem_device *nvmem, unsigned int offset,
+ size_t bytes, void *buf);
+ int nvmem_device_cell_read(struct nvmem_device *nvmem,
+ struct nvmem_cell_info *info, void *buf);
+ int nvmem_device_cell_write(struct nvmem_device *nvmem,
+ struct nvmem_cell_info *info, void *buf);
+
+Before the consumers can read/write NVMEM directly, it should get hold
+of nvmem_controller from one of the `*nvmem_device_get()` api.
+
+The difference between these apis and cell based apis is that these apis always
+take nvmem_device as parameter.
+
+5. Releasing a reference to the NVMEM
+=====================================
+
+When a consumer no longer needs the NVMEM, it has to release the reference
+to the NVMEM it has obtained using the APIs mentioned in the above section.
+The NVMEM framework provides 2 APIs to release a reference to the NVMEM::
+
+ void nvmem_cell_put(struct nvmem_cell *cell);
+ void devm_nvmem_cell_put(struct device *dev, struct nvmem_cell *cell);
+ void nvmem_device_put(struct nvmem_device *nvmem);
+ void devm_nvmem_device_put(struct device *dev, struct nvmem_device *nvmem);
+
+Both these APIs are used to release a reference to the NVMEM and
+devm_nvmem_cell_put and devm_nvmem_device_put destroys the devres associated
+with this NVMEM.
+
+Userspace
++++++++++
+
+6. Userspace binary interface
+==============================
+
+Userspace can read/write the raw NVMEM file located at::
+
+ /sys/bus/nvmem/devices/*/nvmem
+
+ex::
+
+ hexdump /sys/bus/nvmem/devices/qfprom0/nvmem
+
+ 0000000 0000 0000 0000 0000 0000 0000 0000 0000
+ *
+ 00000a0 db10 2240 0000 e000 0c00 0c00 0000 0c00
+ 0000000 0000 0000 0000 0000 0000 0000 0000 0000
+ ...
+ *
+ 0001000
+
+7. DeviceTree Binding
+=====================
+
+See Documentation/devicetree/bindings/nvmem/nvmem.txt
+
+8. NVMEM layouts
+================
+
+NVMEM layouts are yet another mechanism to create cells. With the device
+tree binding it is possible to specify simple cells by using an offset
+and a length. Sometimes, the cells doesn't have a static offset, but
+the content is still well defined, e.g. tag-length-values. In this case,
+the NVMEM device content has to be first parsed and the cells need to
+be added accordingly. Layouts let you read the content of the NVMEM device
+and let you add cells dynamically.
+
+Another use case for layouts is the post processing of cells. With layouts,
+it is possible to associate a custom post processing hook to a cell. It
+even possible to add this hook to cells not created by the layout itself.
diff --git a/Documentation/driver-api/parport-lowlevel.rst b/Documentation/driver-api/parport-lowlevel.rst
new file mode 100644
index 0000000000..0633d70ffd
--- /dev/null
+++ b/Documentation/driver-api/parport-lowlevel.rst
@@ -0,0 +1,1832 @@
+===============================
+PARPORT interface documentation
+===============================
+
+:Time-stamp: <2000-02-24 13:30:20 twaugh>
+
+Described here are the following functions:
+
+Global functions::
+ parport_register_driver
+ parport_unregister_driver
+ parport_enumerate
+ parport_register_device
+ parport_unregister_device
+ parport_claim
+ parport_claim_or_block
+ parport_release
+ parport_yield
+ parport_yield_blocking
+ parport_wait_peripheral
+ parport_poll_peripheral
+ parport_wait_event
+ parport_negotiate
+ parport_read
+ parport_write
+ parport_open
+ parport_close
+ parport_device_id
+ parport_device_coords
+ parport_find_class
+ parport_find_device
+ parport_set_timeout
+
+Port functions (can be overridden by low-level drivers):
+
+ SPP::
+ port->ops->read_data
+ port->ops->write_data
+ port->ops->read_status
+ port->ops->read_control
+ port->ops->write_control
+ port->ops->frob_control
+ port->ops->enable_irq
+ port->ops->disable_irq
+ port->ops->data_forward
+ port->ops->data_reverse
+
+ EPP::
+ port->ops->epp_write_data
+ port->ops->epp_read_data
+ port->ops->epp_write_addr
+ port->ops->epp_read_addr
+
+ ECP::
+ port->ops->ecp_write_data
+ port->ops->ecp_read_data
+ port->ops->ecp_write_addr
+
+ Other::
+ port->ops->nibble_read_data
+ port->ops->byte_read_data
+ port->ops->compat_write_data
+
+The parport subsystem comprises ``parport`` (the core port-sharing
+code), and a variety of low-level drivers that actually do the port
+accesses. Each low-level driver handles a particular style of port
+(PC, Amiga, and so on).
+
+The parport interface to the device driver author can be broken down
+into global functions and port functions.
+
+The global functions are mostly for communicating between the device
+driver and the parport subsystem: acquiring a list of available ports,
+claiming a port for exclusive use, and so on. They also include
+``generic`` functions for doing standard things that will work on any
+IEEE 1284-capable architecture.
+
+The port functions are provided by the low-level drivers, although the
+core parport module provides generic ``defaults`` for some routines.
+The port functions can be split into three groups: SPP, EPP, and ECP.
+
+SPP (Standard Parallel Port) functions modify so-called ``SPP``
+registers: data, status, and control. The hardware may not actually
+have registers exactly like that, but the PC does and this interface is
+modelled after common PC implementations. Other low-level drivers may
+be able to emulate most of the functionality.
+
+EPP (Enhanced Parallel Port) functions are provided for reading and
+writing in IEEE 1284 EPP mode, and ECP (Extended Capabilities Port)
+functions are used for IEEE 1284 ECP mode. (What about BECP? Does
+anyone care?)
+
+Hardware assistance for EPP and/or ECP transfers may or may not be
+available, and if it is available it may or may not be used. If
+hardware is not used, the transfer will be software-driven. In order
+to cope with peripherals that only tenuously support IEEE 1284, a
+low-level driver specific function is provided, for altering 'fudge
+factors'.
+
+Global functions
+================
+
+parport_register_driver - register a device driver with parport
+---------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_driver {
+ const char *name;
+ void (*attach) (struct parport *);
+ void (*detach) (struct parport *);
+ struct parport_driver *next;
+ };
+ int parport_register_driver (struct parport_driver *driver);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+In order to be notified about parallel ports when they are detected,
+parport_register_driver should be called. Your driver will
+immediately be notified of all ports that have already been detected,
+and of each new port as low-level drivers are loaded.
+
+A ``struct parport_driver`` contains the textual name of your driver,
+a pointer to a function to handle new ports, and a pointer to a
+function to handle ports going away due to a low-level driver
+unloading. Ports will only be detached if they are not being used
+(i.e. there are no devices registered on them).
+
+The visible parts of the ``struct parport *`` argument given to
+attach/detach are::
+
+ struct parport
+ {
+ struct parport *next; /* next parport in list */
+ const char *name; /* port's name */
+ unsigned int modes; /* bitfield of hardware modes */
+ struct parport_device_info probe_info;
+ /* IEEE1284 info */
+ int number; /* parport index */
+ struct parport_operations *ops;
+ ...
+ };
+
+There are other members of the structure, but they should not be
+touched.
+
+The ``modes`` member summarises the capabilities of the underlying
+hardware. It consists of flags which may be bitwise-ored together:
+
+ ============================= ===============================================
+ PARPORT_MODE_PCSPP IBM PC registers are available,
+ i.e. functions that act on data,
+ control and status registers are
+ probably writing directly to the
+ hardware.
+ PARPORT_MODE_TRISTATE The data drivers may be turned off.
+ This allows the data lines to be used
+ for reverse (peripheral to host)
+ transfers.
+ PARPORT_MODE_COMPAT The hardware can assist with
+ compatibility-mode (printer)
+ transfers, i.e. compat_write_block.
+ PARPORT_MODE_EPP The hardware can assist with EPP
+ transfers.
+ PARPORT_MODE_ECP The hardware can assist with ECP
+ transfers.
+ PARPORT_MODE_DMA The hardware can use DMA, so you might
+ want to pass ISA DMA-able memory
+ (i.e. memory allocated using the
+ GFP_DMA flag with kmalloc) to the
+ low-level driver in order to take
+ advantage of it.
+ ============================= ===============================================
+
+There may be other flags in ``modes`` as well.
+
+The contents of ``modes`` is advisory only. For example, if the
+hardware is capable of DMA, and PARPORT_MODE_DMA is in ``modes``, it
+doesn't necessarily mean that DMA will always be used when possible.
+Similarly, hardware that is capable of assisting ECP transfers won't
+necessarily be used.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+Zero on success, otherwise an error code.
+
+ERRORS
+^^^^^^
+
+None. (Can it fail? Why return int?)
+
+EXAMPLE
+^^^^^^^
+
+::
+
+ static void lp_attach (struct parport *port)
+ {
+ ...
+ private = kmalloc (...);
+ dev[count++] = parport_register_device (...);
+ ...
+ }
+
+ static void lp_detach (struct parport *port)
+ {
+ ...
+ }
+
+ static struct parport_driver lp_driver = {
+ "lp",
+ lp_attach,
+ lp_detach,
+ NULL /* always put NULL here */
+ };
+
+ int lp_init (void)
+ {
+ ...
+ if (parport_register_driver (&lp_driver)) {
+ /* Failed; nothing we can do. */
+ return -EIO;
+ }
+ ...
+ }
+
+
+SEE ALSO
+^^^^^^^^
+
+parport_unregister_driver, parport_register_device, parport_enumerate
+
+
+
+parport_unregister_driver - tell parport to forget about this driver
+--------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_driver {
+ const char *name;
+ void (*attach) (struct parport *);
+ void (*detach) (struct parport *);
+ struct parport_driver *next;
+ };
+ void parport_unregister_driver (struct parport_driver *driver);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+This tells parport not to notify the device driver of new ports or of
+ports going away. Registered devices belonging to that driver are NOT
+unregistered: parport_unregister_device must be used for each one.
+
+EXAMPLE
+^^^^^^^
+
+::
+
+ void cleanup_module (void)
+ {
+ ...
+ /* Stop notifications. */
+ parport_unregister_driver (&lp_driver);
+
+ /* Unregister devices. */
+ for (i = 0; i < NUM_DEVS; i++)
+ parport_unregister_device (dev[i]);
+ ...
+ }
+
+SEE ALSO
+^^^^^^^^
+
+parport_register_driver, parport_enumerate
+
+
+
+parport_enumerate - retrieve a list of parallel ports (DEPRECATED)
+------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport *parport_enumerate (void);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Retrieve the first of a list of valid parallel ports for this machine.
+Successive parallel ports can be found using the ``struct parport
+*next`` element of the ``struct parport *`` that is returned. If ``next``
+is NULL, there are no more parallel ports in the list. The number of
+ports in the list will not exceed PARPORT_MAX.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+A ``struct parport *`` describing a valid parallel port for the machine,
+or NULL if there are none.
+
+ERRORS
+^^^^^^
+
+This function can return NULL to indicate that there are no parallel
+ports to use.
+
+EXAMPLE
+^^^^^^^
+
+::
+
+ int detect_device (void)
+ {
+ struct parport *port;
+
+ for (port = parport_enumerate ();
+ port != NULL;
+ port = port->next) {
+ /* Try to detect a device on the port... */
+ ...
+ }
+ }
+
+ ...
+ }
+
+NOTES
+^^^^^
+
+parport_enumerate is deprecated; parport_register_driver should be
+used instead.
+
+SEE ALSO
+^^^^^^^^
+
+parport_register_driver, parport_unregister_driver
+
+
+
+parport_register_device - register to use a port
+------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ typedef int (*preempt_func) (void *handle);
+ typedef void (*wakeup_func) (void *handle);
+ typedef int (*irq_func) (int irq, void *handle, struct pt_regs *);
+
+ struct pardevice *parport_register_device(struct parport *port,
+ const char *name,
+ preempt_func preempt,
+ wakeup_func wakeup,
+ irq_func irq,
+ int flags,
+ void *handle);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Use this function to register your device driver on a parallel port
+(``port``). Once you have done that, you will be able to use
+parport_claim and parport_release in order to use the port.
+
+The (``name``) argument is the name of the device that appears in /proc
+filesystem. The string must be valid for the whole lifetime of the
+device (until parport_unregister_device is called).
+
+This function will register three callbacks into your driver:
+``preempt``, ``wakeup`` and ``irq``. Each of these may be NULL in order to
+indicate that you do not want a callback.
+
+When the ``preempt`` function is called, it is because another driver
+wishes to use the parallel port. The ``preempt`` function should return
+non-zero if the parallel port cannot be released yet -- if zero is
+returned, the port is lost to another driver and the port must be
+re-claimed before use.
+
+The ``wakeup`` function is called once another driver has released the
+port and no other driver has yet claimed it. You can claim the
+parallel port from within the ``wakeup`` function (in which case the
+claim is guaranteed to succeed), or choose not to if you don't need it
+now.
+
+If an interrupt occurs on the parallel port your driver has claimed,
+the ``irq`` function will be called. (Write something about shared
+interrupts here.)
+
+The ``handle`` is a pointer to driver-specific data, and is passed to
+the callback functions.
+
+``flags`` may be a bitwise combination of the following flags:
+
+ ===================== =================================================
+ Flag Meaning
+ ===================== =================================================
+ PARPORT_DEV_EXCL The device cannot share the parallel port at all.
+ Use this only when absolutely necessary.
+ ===================== =================================================
+
+The typedefs are not actually defined -- they are only shown in order
+to make the function prototype more readable.
+
+The visible parts of the returned ``struct pardevice`` are::
+
+ struct pardevice {
+ struct parport *port; /* Associated port */
+ void *private; /* Device driver's 'handle' */
+ ...
+ };
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+A ``struct pardevice *``: a handle to the registered parallel port
+device that can be used for parport_claim, parport_release, etc.
+
+ERRORS
+^^^^^^
+
+A return value of NULL indicates that there was a problem registering
+a device on that port.
+
+EXAMPLE
+^^^^^^^
+
+::
+
+ static int preempt (void *handle)
+ {
+ if (busy_right_now)
+ return 1;
+
+ must_reclaim_port = 1;
+ return 0;
+ }
+
+ static void wakeup (void *handle)
+ {
+ struct toaster *private = handle;
+ struct pardevice *dev = private->dev;
+ if (!dev) return; /* avoid races */
+
+ if (want_port)
+ parport_claim (dev);
+ }
+
+ static int toaster_detect (struct toaster *private, struct parport *port)
+ {
+ private->dev = parport_register_device (port, "toaster", preempt,
+ wakeup, NULL, 0,
+ private);
+ if (!private->dev)
+ /* Couldn't register with parport. */
+ return -EIO;
+
+ must_reclaim_port = 0;
+ busy_right_now = 1;
+ parport_claim_or_block (private->dev);
+ ...
+ /* Don't need the port while the toaster warms up. */
+ busy_right_now = 0;
+ ...
+ busy_right_now = 1;
+ if (must_reclaim_port) {
+ parport_claim_or_block (private->dev);
+ must_reclaim_port = 0;
+ }
+ ...
+ }
+
+SEE ALSO
+^^^^^^^^
+
+parport_unregister_device, parport_claim
+
+
+
+parport_unregister_device - finish using a port
+-----------------------------------------------
+
+SYNPOPSIS
+
+::
+
+ #include <linux/parport.h>
+
+ void parport_unregister_device (struct pardevice *dev);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+This function is the opposite of parport_register_device. After using
+parport_unregister_device, ``dev`` is no longer a valid device handle.
+
+You should not unregister a device that is currently claimed, although
+if you do it will be released automatically.
+
+EXAMPLE
+^^^^^^^
+
+::
+
+ ...
+ kfree (dev->private); /* before we lose the pointer */
+ parport_unregister_device (dev);
+ ...
+
+SEE ALSO
+^^^^^^^^
+
+
+parport_unregister_driver
+
+parport_claim, parport_claim_or_block - claim the parallel port for a device
+----------------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ int parport_claim (struct pardevice *dev);
+ int parport_claim_or_block (struct pardevice *dev);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+These functions attempt to gain control of the parallel port on which
+``dev`` is registered. ``parport_claim`` does not block, but
+``parport_claim_or_block`` may do. (Put something here about blocking
+interruptibly or non-interruptibly.)
+
+You should not try to claim a port that you have already claimed.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+A return value of zero indicates that the port was successfully
+claimed, and the caller now has possession of the parallel port.
+
+If ``parport_claim_or_block`` blocks before returning successfully, the
+return value is positive.
+
+ERRORS
+^^^^^^
+
+========== ==========================================================
+ -EAGAIN The port is unavailable at the moment, but another attempt
+ to claim it may succeed.
+========== ==========================================================
+
+SEE ALSO
+^^^^^^^^
+
+
+parport_release
+
+parport_release - release the parallel port
+-------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ void parport_release (struct pardevice *dev);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Once a parallel port device has been claimed, it can be released using
+``parport_release``. It cannot fail, but you should not release a
+device that you do not have possession of.
+
+EXAMPLE
+^^^^^^^
+
+::
+
+ static size_t write (struct pardevice *dev, const void *buf,
+ size_t len)
+ {
+ ...
+ written = dev->port->ops->write_ecp_data (dev->port, buf,
+ len);
+ parport_release (dev);
+ ...
+ }
+
+
+SEE ALSO
+^^^^^^^^
+
+change_mode, parport_claim, parport_claim_or_block, parport_yield
+
+
+
+parport_yield, parport_yield_blocking - temporarily release a parallel port
+---------------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ int parport_yield (struct pardevice *dev)
+ int parport_yield_blocking (struct pardevice *dev);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+When a driver has control of a parallel port, it may allow another
+driver to temporarily ``borrow`` it. ``parport_yield`` does not block;
+``parport_yield_blocking`` may do.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+A return value of zero indicates that the caller still owns the port
+and the call did not block.
+
+A positive return value from ``parport_yield_blocking`` indicates that
+the caller still owns the port and the call blocked.
+
+A return value of -EAGAIN indicates that the caller no longer owns the
+port, and it must be re-claimed before use.
+
+ERRORS
+^^^^^^
+
+========= ==========================================================
+ -EAGAIN Ownership of the parallel port was given away.
+========= ==========================================================
+
+SEE ALSO
+^^^^^^^^
+
+parport_release
+
+
+
+parport_wait_peripheral - wait for status lines, up to 35ms
+-----------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ int parport_wait_peripheral (struct parport *port,
+ unsigned char mask,
+ unsigned char val);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Wait for the status lines in mask to match the values in val.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+======== ==========================================================
+ -EINTR a signal is pending
+ 0 the status lines in mask have values in val
+ 1 timed out while waiting (35ms elapsed)
+======== ==========================================================
+
+SEE ALSO
+^^^^^^^^
+
+parport_poll_peripheral
+
+
+
+parport_poll_peripheral - wait for status lines, in usec
+--------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ int parport_poll_peripheral (struct parport *port,
+ unsigned char mask,
+ unsigned char val,
+ int usec);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Wait for the status lines in mask to match the values in val.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+======== ==========================================================
+ -EINTR a signal is pending
+ 0 the status lines in mask have values in val
+ 1 timed out while waiting (usec microseconds have elapsed)
+======== ==========================================================
+
+SEE ALSO
+^^^^^^^^
+
+parport_wait_peripheral
+
+
+
+parport_wait_event - wait for an event on a port
+------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ int parport_wait_event (struct parport *port, signed long timeout)
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Wait for an event (e.g. interrupt) on a port. The timeout is in
+jiffies.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+======= ==========================================================
+ 0 success
+ <0 error (exit as soon as possible)
+ >0 timed out
+======= ==========================================================
+
+parport_negotiate - perform IEEE 1284 negotiation
+-------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ int parport_negotiate (struct parport *, int mode);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Perform IEEE 1284 negotiation.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+======= ==========================================================
+ 0 handshake OK; IEEE 1284 peripheral and mode available
+ -1 handshake failed; peripheral not compliant (or none present)
+ 1 handshake OK; IEEE 1284 peripheral present but mode not
+ available
+======= ==========================================================
+
+SEE ALSO
+^^^^^^^^
+
+parport_read, parport_write
+
+
+
+parport_read - read data from device
+------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ ssize_t parport_read (struct parport *, void *buf, size_t len);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Read data from device in current IEEE 1284 transfer mode. This only
+works for modes that support reverse data transfer.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+If negative, an error code; otherwise the number of bytes transferred.
+
+SEE ALSO
+^^^^^^^^
+
+parport_write, parport_negotiate
+
+
+
+parport_write - write data to device
+------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ ssize_t parport_write (struct parport *, const void *buf, size_t len);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Write data to device in current IEEE 1284 transfer mode. This only
+works for modes that support forward data transfer.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+If negative, an error code; otherwise the number of bytes transferred.
+
+SEE ALSO
+^^^^^^^^
+
+parport_read, parport_negotiate
+
+
+
+parport_open - register device for particular device number
+-----------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct pardevice *parport_open (int devnum, const char *name,
+ int (*pf) (void *),
+ void (*kf) (void *),
+ void (*irqf) (int, void *,
+ struct pt_regs *),
+ int flags, void *handle);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+This is like parport_register_device but takes a device number instead
+of a pointer to a struct parport.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+See parport_register_device. If no device is associated with devnum,
+NULL is returned.
+
+SEE ALSO
+^^^^^^^^
+
+parport_register_device
+
+
+
+parport_close - unregister device for particular device number
+--------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ void parport_close (struct pardevice *dev);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+This is the equivalent of parport_unregister_device for parport_open.
+
+SEE ALSO
+^^^^^^^^
+
+parport_unregister_device, parport_open
+
+
+
+parport_device_id - obtain IEEE 1284 Device ID
+----------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ ssize_t parport_device_id (int devnum, char *buffer, size_t len);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Obtains the IEEE 1284 Device ID associated with a given device.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+If negative, an error code; otherwise, the number of bytes of buffer
+that contain the device ID. The format of the device ID is as
+follows::
+
+ [length][ID]
+
+The first two bytes indicate the inclusive length of the entire Device
+ID, and are in big-endian order. The ID is a sequence of pairs of the
+form::
+
+ key:value;
+
+NOTES
+^^^^^
+
+Many devices have ill-formed IEEE 1284 Device IDs.
+
+SEE ALSO
+^^^^^^^^
+
+parport_find_class, parport_find_device
+
+
+
+parport_device_coords - convert device number to device coordinates
+-------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ int parport_device_coords (int devnum, int *parport, int *mux,
+ int *daisy);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Convert between device number (zero-based) and device coordinates
+(port, multiplexor, daisy chain address).
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+Zero on success, in which case the coordinates are (``*parport``, ``*mux``,
+``*daisy``).
+
+SEE ALSO
+^^^^^^^^
+
+parport_open, parport_device_id
+
+
+
+parport_find_class - find a device by its class
+-----------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ typedef enum {
+ PARPORT_CLASS_LEGACY = 0, /* Non-IEEE1284 device */
+ PARPORT_CLASS_PRINTER,
+ PARPORT_CLASS_MODEM,
+ PARPORT_CLASS_NET,
+ PARPORT_CLASS_HDC, /* Hard disk controller */
+ PARPORT_CLASS_PCMCIA,
+ PARPORT_CLASS_MEDIA, /* Multimedia device */
+ PARPORT_CLASS_FDC, /* Floppy disk controller */
+ PARPORT_CLASS_PORTS,
+ PARPORT_CLASS_SCANNER,
+ PARPORT_CLASS_DIGCAM,
+ PARPORT_CLASS_OTHER, /* Anything else */
+ PARPORT_CLASS_UNSPEC, /* No CLS field in ID */
+ PARPORT_CLASS_SCSIADAPTER
+ } parport_device_class;
+
+ int parport_find_class (parport_device_class cls, int from);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Find a device by class. The search starts from device number from+1.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The device number of the next device in that class, or -1 if no such
+device exists.
+
+NOTES
+^^^^^
+
+Example usage::
+
+ int devnum = -1;
+ while ((devnum = parport_find_class (PARPORT_CLASS_DIGCAM, devnum)) != -1) {
+ struct pardevice *dev = parport_open (devnum, ...);
+ ...
+ }
+
+SEE ALSO
+^^^^^^^^
+
+parport_find_device, parport_open, parport_device_id
+
+
+
+parport_find_device - find a device by its class
+------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ int parport_find_device (const char *mfg, const char *mdl, int from);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Find a device by vendor and model. The search starts from device
+number from+1.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The device number of the next device matching the specifications, or
+-1 if no such device exists.
+
+NOTES
+^^^^^
+
+Example usage::
+
+ int devnum = -1;
+ while ((devnum = parport_find_device ("IOMEGA", "ZIP+", devnum)) != -1) {
+ struct pardevice *dev = parport_open (devnum, ...);
+ ...
+ }
+
+SEE ALSO
+^^^^^^^^
+
+parport_find_class, parport_open, parport_device_id
+
+
+
+parport_set_timeout - set the inactivity timeout
+------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ long parport_set_timeout (struct pardevice *dev, long inactivity);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Set the inactivity timeout, in jiffies, for a registered device. The
+previous timeout is returned.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The previous timeout, in jiffies.
+
+NOTES
+^^^^^
+
+Some of the port->ops functions for a parport may take time, owing to
+delays at the peripheral. After the peripheral has not responded for
+``inactivity`` jiffies, a timeout will occur and the blocking function
+will return.
+
+A timeout of 0 jiffies is a special case: the function must do as much
+as it can without blocking or leaving the hardware in an unknown
+state. If port operations are performed from within an interrupt
+handler, for instance, a timeout of 0 jiffies should be used.
+
+Once set for a registered device, the timeout will remain at the set
+value until set again.
+
+SEE ALSO
+^^^^^^^^
+
+port->ops->xxx_read/write_yyy
+
+
+
+
+PORT FUNCTIONS
+==============
+
+The functions in the port->ops structure (struct parport_operations)
+are provided by the low-level driver responsible for that port.
+
+port->ops->read_data - read the data register
+---------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ unsigned char (*read_data) (struct parport *port);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+If port->modes contains the PARPORT_MODE_TRISTATE flag and the
+PARPORT_CONTROL_DIRECTION bit in the control register is set, this
+returns the value on the data pins. If port->modes contains the
+PARPORT_MODE_TRISTATE flag and the PARPORT_CONTROL_DIRECTION bit is
+not set, the return value _may_ be the last value written to the data
+register. Otherwise the return value is undefined.
+
+SEE ALSO
+^^^^^^^^
+
+write_data, read_status, write_control
+
+
+
+port->ops->write_data - write the data register
+-----------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ void (*write_data) (struct parport *port, unsigned char d);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes to the data register. May have side-effects (a STROBE pulse,
+for instance).
+
+SEE ALSO
+^^^^^^^^
+
+read_data, read_status, write_control
+
+
+
+port->ops->read_status - read the status register
+-------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ unsigned char (*read_status) (struct parport *port);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads from the status register. This is a bitmask:
+
+- PARPORT_STATUS_ERROR (printer fault, "nFault")
+- PARPORT_STATUS_SELECT (on-line, "Select")
+- PARPORT_STATUS_PAPEROUT (no paper, "PError")
+- PARPORT_STATUS_ACK (handshake, "nAck")
+- PARPORT_STATUS_BUSY (busy, "Busy")
+
+There may be other bits set.
+
+SEE ALSO
+^^^^^^^^
+
+read_data, write_data, write_control
+
+
+
+port->ops->read_control - read the control register
+---------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ unsigned char (*read_control) (struct parport *port);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Returns the last value written to the control register (either from
+write_control or frob_control). No port access is performed.
+
+SEE ALSO
+^^^^^^^^
+
+read_data, write_data, read_status, write_control
+
+
+
+port->ops->write_control - write the control register
+-----------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ void (*write_control) (struct parport *port, unsigned char s);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes to the control register. This is a bitmask::
+
+ _______
+ - PARPORT_CONTROL_STROBE (nStrobe)
+ _______
+ - PARPORT_CONTROL_AUTOFD (nAutoFd)
+ _____
+ - PARPORT_CONTROL_INIT (nInit)
+ _________
+ - PARPORT_CONTROL_SELECT (nSelectIn)
+
+SEE ALSO
+^^^^^^^^
+
+read_data, write_data, read_status, frob_control
+
+
+
+port->ops->frob_control - write control register bits
+-----------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ unsigned char (*frob_control) (struct parport *port,
+ unsigned char mask,
+ unsigned char val);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+This is equivalent to reading from the control register, masking out
+the bits in mask, exclusive-or'ing with the bits in val, and writing
+the result to the control register.
+
+As some ports don't allow reads from the control port, a software copy
+of its contents is maintained, so frob_control is in fact only one
+port access.
+
+SEE ALSO
+^^^^^^^^
+
+read_data, write_data, read_status, write_control
+
+
+
+port->ops->enable_irq - enable interrupt generation
+---------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ void (*enable_irq) (struct parport *port);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+The parallel port hardware is instructed to generate interrupts at
+appropriate moments, although those moments are
+architecture-specific. For the PC architecture, interrupts are
+commonly generated on the rising edge of nAck.
+
+SEE ALSO
+^^^^^^^^
+
+disable_irq
+
+
+
+port->ops->disable_irq - disable interrupt generation
+-----------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ void (*disable_irq) (struct parport *port);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+The parallel port hardware is instructed not to generate interrupts.
+The interrupt itself is not masked.
+
+SEE ALSO
+^^^^^^^^
+
+enable_irq
+
+
+
+port->ops->data_forward - enable data drivers
+---------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ void (*data_forward) (struct parport *port);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Enables the data line drivers, for 8-bit host-to-peripheral
+communications.
+
+SEE ALSO
+^^^^^^^^
+
+data_reverse
+
+
+
+port->ops->data_reverse - tristate the buffer
+---------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ void (*data_reverse) (struct parport *port);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Places the data bus in a high impedance state, if port->modes has the
+PARPORT_MODE_TRISTATE bit set.
+
+SEE ALSO
+^^^^^^^^
+
+data_forward
+
+
+
+port->ops->epp_write_data - write EPP data
+------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ size_t (*epp_write_data) (struct parport *port, const void *buf,
+ size_t len, int flags);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes data in EPP mode, and returns the number of bytes written.
+
+The ``flags`` parameter may be one or more of the following,
+bitwise-or'ed together:
+
+======================= =================================================
+PARPORT_EPP_FAST Use fast transfers. Some chips provide 16-bit and
+ 32-bit registers. However, if a transfer
+ times out, the return value may be unreliable.
+======================= =================================================
+
+SEE ALSO
+^^^^^^^^
+
+epp_read_data, epp_write_addr, epp_read_addr
+
+
+
+port->ops->epp_read_data - read EPP data
+----------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ size_t (*epp_read_data) (struct parport *port, void *buf,
+ size_t len, int flags);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads data in EPP mode, and returns the number of bytes read.
+
+The ``flags`` parameter may be one or more of the following,
+bitwise-or'ed together:
+
+======================= =================================================
+PARPORT_EPP_FAST Use fast transfers. Some chips provide 16-bit and
+ 32-bit registers. However, if a transfer
+ times out, the return value may be unreliable.
+======================= =================================================
+
+SEE ALSO
+^^^^^^^^
+
+epp_write_data, epp_write_addr, epp_read_addr
+
+
+
+port->ops->epp_write_addr - write EPP address
+---------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ size_t (*epp_write_addr) (struct parport *port,
+ const void *buf, size_t len, int flags);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes EPP addresses (8 bits each), and returns the number written.
+
+The ``flags`` parameter may be one or more of the following,
+bitwise-or'ed together:
+
+======================= =================================================
+PARPORT_EPP_FAST Use fast transfers. Some chips provide 16-bit and
+ 32-bit registers. However, if a transfer
+ times out, the return value may be unreliable.
+======================= =================================================
+
+(Does PARPORT_EPP_FAST make sense for this function?)
+
+SEE ALSO
+^^^^^^^^
+
+epp_write_data, epp_read_data, epp_read_addr
+
+
+
+port->ops->epp_read_addr - read EPP address
+-------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ size_t (*epp_read_addr) (struct parport *port, void *buf,
+ size_t len, int flags);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads EPP addresses (8 bits each), and returns the number read.
+
+The ``flags`` parameter may be one or more of the following,
+bitwise-or'ed together:
+
+======================= =================================================
+PARPORT_EPP_FAST Use fast transfers. Some chips provide 16-bit and
+ 32-bit registers. However, if a transfer
+ times out, the return value may be unreliable.
+======================= =================================================
+
+(Does PARPORT_EPP_FAST make sense for this function?)
+
+SEE ALSO
+^^^^^^^^
+
+epp_write_data, epp_read_data, epp_write_addr
+
+
+
+port->ops->ecp_write_data - write a block of ECP data
+-----------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ size_t (*ecp_write_data) (struct parport *port,
+ const void *buf, size_t len, int flags);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes a block of ECP data. The ``flags`` parameter is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of bytes written.
+
+SEE ALSO
+^^^^^^^^
+
+ecp_read_data, ecp_write_addr
+
+
+
+port->ops->ecp_read_data - read a block of ECP data
+---------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ size_t (*ecp_read_data) (struct parport *port,
+ void *buf, size_t len, int flags);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads a block of ECP data. The ``flags`` parameter is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of bytes read. NB. There may be more unread data in a
+FIFO. Is there a way of stunning the FIFO to prevent this?
+
+SEE ALSO
+^^^^^^^^
+
+ecp_write_block, ecp_write_addr
+
+
+
+port->ops->ecp_write_addr - write a block of ECP addresses
+----------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ size_t (*ecp_write_addr) (struct parport *port,
+ const void *buf, size_t len, int flags);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes a block of ECP addresses. The ``flags`` parameter is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of bytes written.
+
+NOTES
+^^^^^
+
+This may use a FIFO, and if so shall not return until the FIFO is empty.
+
+SEE ALSO
+^^^^^^^^
+
+ecp_read_data, ecp_write_data
+
+
+
+port->ops->nibble_read_data - read a block of data in nibble mode
+-----------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ size_t (*nibble_read_data) (struct parport *port,
+ void *buf, size_t len, int flags);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads a block of data in nibble mode. The ``flags`` parameter is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of whole bytes read.
+
+SEE ALSO
+^^^^^^^^
+
+byte_read_data, compat_write_data
+
+
+
+port->ops->byte_read_data - read a block of data in byte mode
+-------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ size_t (*byte_read_data) (struct parport *port,
+ void *buf, size_t len, int flags);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads a block of data in byte mode. The ``flags`` parameter is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of bytes read.
+
+SEE ALSO
+^^^^^^^^
+
+nibble_read_data, compat_write_data
+
+
+
+port->ops->compat_write_data - write a block of data in compatibility mode
+--------------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+ #include <linux/parport.h>
+
+ struct parport_operations {
+ ...
+ size_t (*compat_write_data) (struct parport *port,
+ const void *buf, size_t len, int flags);
+ ...
+ };
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes a block of data in compatibility mode. The ``flags`` parameter
+is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of bytes written.
+
+SEE ALSO
+^^^^^^^^
+
+nibble_read_data, byte_read_data
diff --git a/Documentation/driver-api/pci/index.rst b/Documentation/driver-api/pci/index.rst
new file mode 100644
index 0000000000..c6cf1fef61
--- /dev/null
+++ b/Documentation/driver-api/pci/index.rst
@@ -0,0 +1,22 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+============================================
+The Linux PCI driver implementer's API guide
+============================================
+
+.. class:: toc-title
+
+ Table of contents
+
+.. toctree::
+ :maxdepth: 2
+
+ pci
+ p2pdma
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/pci/p2pdma.rst b/Documentation/driver-api/pci/p2pdma.rst
new file mode 100644
index 0000000000..d0b241628c
--- /dev/null
+++ b/Documentation/driver-api/pci/p2pdma.rst
@@ -0,0 +1,131 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+============================
+PCI Peer-to-Peer DMA Support
+============================
+
+The PCI bus has pretty decent support for performing DMA transfers
+between two devices on the bus. This type of transaction is henceforth
+called Peer-to-Peer (or P2P). However, there are a number of issues that
+make P2P transactions tricky to do in a perfectly safe way.
+
+One of the biggest issues is that PCI doesn't require forwarding
+transactions between hierarchy domains, and in PCIe, each Root Port
+defines a separate hierarchy domain. To make things worse, there is no
+simple way to determine if a given Root Complex supports this or not.
+(See PCIe r4.0, sec 1.3.1). Therefore, as of this writing, the kernel
+only supports doing P2P when the endpoints involved are all behind the
+same PCI bridge, as such devices are all in the same PCI hierarchy
+domain, and the spec guarantees that all transactions within the
+hierarchy will be routable, but it does not require routing
+between hierarchies.
+
+The second issue is that to make use of existing interfaces in Linux,
+memory that is used for P2P transactions needs to be backed by struct
+pages. However, PCI BARs are not typically cache coherent so there are
+a few corner case gotchas with these pages so developers need to
+be careful about what they do with them.
+
+
+Driver Writer's Guide
+=====================
+
+In a given P2P implementation there may be three or more different
+types of kernel drivers in play:
+
+* Provider - A driver which provides or publishes P2P resources like
+ memory or doorbell registers to other drivers.
+* Client - A driver which makes use of a resource by setting up a
+ DMA transaction to or from it.
+* Orchestrator - A driver which orchestrates the flow of data between
+ clients and providers.
+
+In many cases there could be overlap between these three types (i.e.,
+it may be typical for a driver to be both a provider and a client).
+
+For example, in the NVMe Target Copy Offload implementation:
+
+* The NVMe PCI driver is both a client, provider and orchestrator
+ in that it exposes any CMB (Controller Memory Buffer) as a P2P memory
+ resource (provider), it accepts P2P memory pages as buffers in requests
+ to be used directly (client) and it can also make use of the CMB as
+ submission queue entries (orchestrator).
+* The RDMA driver is a client in this arrangement so that an RNIC
+ can DMA directly to the memory exposed by the NVMe device.
+* The NVMe Target driver (nvmet) can orchestrate the data from the RNIC
+ to the P2P memory (CMB) and then to the NVMe device (and vice versa).
+
+This is currently the only arrangement supported by the kernel but
+one could imagine slight tweaks to this that would allow for the same
+functionality. For example, if a specific RNIC added a BAR with some
+memory behind it, its driver could add support as a P2P provider and
+then the NVMe Target could use the RNIC's memory instead of the CMB
+in cases where the NVMe cards in use do not have CMB support.
+
+
+Provider Drivers
+----------------
+
+A provider simply needs to register a BAR (or a portion of a BAR)
+as a P2P DMA resource using :c:func:`pci_p2pdma_add_resource()`.
+This will register struct pages for all the specified memory.
+
+After that it may optionally publish all of its resources as
+P2P memory using :c:func:`pci_p2pmem_publish()`. This will allow
+any orchestrator drivers to find and use the memory. When marked in
+this way, the resource must be regular memory with no side effects.
+
+For the time being this is fairly rudimentary in that all resources
+are typically going to be P2P memory. Future work will likely expand
+this to include other types of resources like doorbells.
+
+
+Client Drivers
+--------------
+
+A client driver only has to use the mapping API :c:func:`dma_map_sg()`
+and :c:func:`dma_unmap_sg()` functions as usual, and the implementation
+will do the right thing for the P2P capable memory.
+
+
+Orchestrator Drivers
+--------------------
+
+The first task an orchestrator driver must do is compile a list of
+all client devices that will be involved in a given transaction. For
+example, the NVMe Target driver creates a list including the namespace
+block device and the RNIC in use. If the orchestrator has access to
+a specific P2P provider to use it may check compatibility using
+:c:func:`pci_p2pdma_distance()` otherwise it may find a memory provider
+that's compatible with all clients using :c:func:`pci_p2pmem_find()`.
+If more than one provider is supported, the one nearest to all the clients will
+be chosen first. If more than one provider is an equal distance away, the
+one returned will be chosen at random (it is not an arbitrary but
+truly random). This function returns the PCI device to use for the provider
+with a reference taken and therefore when it's no longer needed it should be
+returned with pci_dev_put().
+
+Once a provider is selected, the orchestrator can then use
+:c:func:`pci_alloc_p2pmem()` and :c:func:`pci_free_p2pmem()` to
+allocate P2P memory from the provider. :c:func:`pci_p2pmem_alloc_sgl()`
+and :c:func:`pci_p2pmem_free_sgl()` are convenience functions for
+allocating scatter-gather lists with P2P memory.
+
+Struct Page Caveats
+-------------------
+
+Driver writers should be very careful about not passing these special
+struct pages to code that isn't prepared for it. At this time, the kernel
+interfaces do not have any checks for ensuring this. This obviously
+precludes passing these pages to userspace.
+
+P2P memory is also technically IO memory but should never have any side
+effects behind it. Thus, the order of loads and stores should not be important
+and ioreadX(), iowriteX() and friends should not be necessary.
+
+
+P2P DMA Support Library
+=======================
+
+.. kernel-doc:: drivers/pci/p2pdma.c
+ :export:
diff --git a/Documentation/driver-api/pci/pci.rst b/Documentation/driver-api/pci/pci.rst
new file mode 100644
index 0000000000..4843cfad4f
--- /dev/null
+++ b/Documentation/driver-api/pci/pci.rst
@@ -0,0 +1,47 @@
+PCI Support Library
+-------------------
+
+.. kernel-doc:: drivers/pci/pci.c
+ :export:
+
+.. kernel-doc:: drivers/pci/pci-driver.c
+ :export:
+
+.. kernel-doc:: drivers/pci/remove.c
+ :export:
+
+.. kernel-doc:: drivers/pci/search.c
+ :export:
+
+.. kernel-doc:: drivers/pci/msi/msi.c
+ :export:
+
+.. kernel-doc:: drivers/pci/bus.c
+ :export:
+
+.. kernel-doc:: drivers/pci/access.c
+ :export:
+
+.. kernel-doc:: drivers/pci/irq.c
+ :export:
+
+.. kernel-doc:: drivers/pci/probe.c
+ :export:
+
+.. kernel-doc:: drivers/pci/slot.c
+ :export:
+
+.. kernel-doc:: drivers/pci/rom.c
+ :export:
+
+.. kernel-doc:: drivers/pci/iov.c
+ :export:
+
+.. kernel-doc:: drivers/pci/pci-sysfs.c
+ :internal:
+
+PCI Hotplug Support Library
+---------------------------
+
+.. kernel-doc:: drivers/pci/hotplug/pci_hotplug_core.c
+ :export:
diff --git a/Documentation/driver-api/phy/index.rst b/Documentation/driver-api/phy/index.rst
new file mode 100644
index 0000000000..69ba1216de
--- /dev/null
+++ b/Documentation/driver-api/phy/index.rst
@@ -0,0 +1,18 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=====================
+Generic PHY Framework
+=====================
+
+.. toctree::
+
+ phy
+ samsung-usb2
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
+
diff --git a/Documentation/driver-api/phy/phy.rst b/Documentation/driver-api/phy/phy.rst
new file mode 100644
index 0000000000..81785c084f
--- /dev/null
+++ b/Documentation/driver-api/phy/phy.rst
@@ -0,0 +1,224 @@
+=============
+PHY subsystem
+=============
+
+:Author: Kishon Vijay Abraham I <kishon@ti.com>
+
+This document explains the Generic PHY Framework along with the APIs provided,
+and how-to-use.
+
+Introduction
+============
+
+*PHY* is the abbreviation for physical layer. It is used to connect a device
+to the physical medium e.g., the USB controller has a PHY to provide functions
+such as serialization, de-serialization, encoding, decoding and is responsible
+for obtaining the required data transmission rate. Note that some USB
+controllers have PHY functionality embedded into it and others use an external
+PHY. Other peripherals that use PHY include Wireless LAN, Ethernet,
+SATA etc.
+
+The intention of creating this framework is to bring the PHY drivers spread
+all over the Linux kernel to drivers/phy to increase code re-use and for
+better code maintainability.
+
+This framework will be of use only to devices that use external PHY (PHY
+functionality is not embedded within the controller).
+
+Registering/Unregistering the PHY provider
+==========================================
+
+PHY provider refers to an entity that implements one or more PHY instances.
+For the simple case where the PHY provider implements only a single instance of
+the PHY, the framework provides its own implementation of of_xlate in
+of_phy_simple_xlate. If the PHY provider implements multiple instances, it
+should provide its own implementation of of_xlate. of_xlate is used only for
+dt boot case.
+
+::
+
+ #define of_phy_provider_register(dev, xlate) \
+ __of_phy_provider_register((dev), NULL, THIS_MODULE, (xlate))
+
+ #define devm_of_phy_provider_register(dev, xlate) \
+ __devm_of_phy_provider_register((dev), NULL, THIS_MODULE,
+ (xlate))
+
+of_phy_provider_register and devm_of_phy_provider_register macros can be used to
+register the phy_provider and it takes device and of_xlate as
+arguments. For the dt boot case, all PHY providers should use one of the above
+2 macros to register the PHY provider.
+
+Often the device tree nodes associated with a PHY provider will contain a set
+of children that each represent a single PHY. Some bindings may nest the child
+nodes within extra levels for context and extensibility, in which case the low
+level of_phy_provider_register_full() and devm_of_phy_provider_register_full()
+macros can be used to override the node containing the children.
+
+::
+
+ #define of_phy_provider_register_full(dev, children, xlate) \
+ __of_phy_provider_register(dev, children, THIS_MODULE, xlate)
+
+ #define devm_of_phy_provider_register_full(dev, children, xlate) \
+ __devm_of_phy_provider_register_full(dev, children,
+ THIS_MODULE, xlate)
+
+ void devm_of_phy_provider_unregister(struct device *dev,
+ struct phy_provider *phy_provider);
+ void of_phy_provider_unregister(struct phy_provider *phy_provider);
+
+devm_of_phy_provider_unregister and of_phy_provider_unregister can be used to
+unregister the PHY.
+
+Creating the PHY
+================
+
+The PHY driver should create the PHY in order for other peripheral controllers
+to make use of it. The PHY framework provides 2 APIs to create the PHY.
+
+::
+
+ struct phy *phy_create(struct device *dev, struct device_node *node,
+ const struct phy_ops *ops);
+ struct phy *devm_phy_create(struct device *dev,
+ struct device_node *node,
+ const struct phy_ops *ops);
+
+The PHY drivers can use one of the above 2 APIs to create the PHY by passing
+the device pointer and phy ops.
+phy_ops is a set of function pointers for performing PHY operations such as
+init, exit, power_on and power_off.
+
+Inorder to dereference the private data (in phy_ops), the phy provider driver
+can use phy_set_drvdata() after creating the PHY and use phy_get_drvdata() in
+phy_ops to get back the private data.
+
+Getting a reference to the PHY
+==============================
+
+Before the controller can make use of the PHY, it has to get a reference to
+it. This framework provides the following APIs to get a reference to the PHY.
+
+::
+
+ struct phy *phy_get(struct device *dev, const char *string);
+ struct phy *devm_phy_get(struct device *dev, const char *string);
+ struct phy *devm_phy_optional_get(struct device *dev,
+ const char *string);
+ struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
+ const char *con_id);
+ struct phy *devm_of_phy_optional_get(struct device *dev,
+ struct device_node *np,
+ const char *con_id);
+ struct phy *devm_of_phy_get_by_index(struct device *dev,
+ struct device_node *np,
+ int index);
+
+phy_get, devm_phy_get and devm_phy_optional_get can be used to get the PHY.
+In the case of dt boot, the string arguments
+should contain the phy name as given in the dt data and in the case of
+non-dt boot, it should contain the label of the PHY. The two
+devm_phy_get associates the device with the PHY using devres on
+successful PHY get. On driver detach, release function is invoked on
+the devres data and devres data is freed.
+The _optional_get variants should be used when the phy is optional. These
+functions will never return -ENODEV, but instead return NULL when
+the phy cannot be found.
+Some generic drivers, such as ehci, may use multiple phys. In this case,
+devm_of_phy_get or devm_of_phy_get_by_index can be used to get a phy
+reference based on name or index.
+
+It should be noted that NULL is a valid phy reference. All phy
+consumer calls on the NULL phy become NOPs. That is the release calls,
+the phy_init() and phy_exit() calls, and phy_power_on() and
+phy_power_off() calls are all NOP when applied to a NULL phy. The NULL
+phy is useful in devices for handling optional phy devices.
+
+Order of API calls
+==================
+
+The general order of calls should be::
+
+ [devm_][of_]phy_get()
+ phy_init()
+ phy_power_on()
+ [phy_set_mode[_ext]()]
+ ...
+ phy_power_off()
+ phy_exit()
+ [[of_]phy_put()]
+
+Some PHY drivers may not implement :c:func:`phy_init` or :c:func:`phy_power_on`,
+but controllers should always call these functions to be compatible with other
+PHYs. Some PHYs may require :c:func:`phy_set_mode <phy_set_mode_ext>`, while
+others may use a default mode (typically configured via devicetree or other
+firmware). For compatibility, you should always call this function if you know
+what mode you will be using. Generally, this function should be called after
+:c:func:`phy_power_on`, although some PHY drivers may allow it at any time.
+
+Releasing a reference to the PHY
+================================
+
+When the controller no longer needs the PHY, it has to release the reference
+to the PHY it has obtained using the APIs mentioned in the above section. The
+PHY framework provides 2 APIs to release a reference to the PHY.
+
+::
+
+ void phy_put(struct phy *phy);
+ void devm_phy_put(struct device *dev, struct phy *phy);
+
+Both these APIs are used to release a reference to the PHY and devm_phy_put
+destroys the devres associated with this PHY.
+
+Destroying the PHY
+==================
+
+When the driver that created the PHY is unloaded, it should destroy the PHY it
+created using one of the following 2 APIs::
+
+ void phy_destroy(struct phy *phy);
+ void devm_phy_destroy(struct device *dev, struct phy *phy);
+
+Both these APIs destroy the PHY and devm_phy_destroy destroys the devres
+associated with this PHY.
+
+PM Runtime
+==========
+
+This subsystem is pm runtime enabled. So while creating the PHY,
+pm_runtime_enable of the phy device created by this subsystem is called and
+while destroying the PHY, pm_runtime_disable is called. Note that the phy
+device created by this subsystem will be a child of the device that calls
+phy_create (PHY provider device).
+
+So pm_runtime_get_sync of the phy_device created by this subsystem will invoke
+pm_runtime_get_sync of PHY provider device because of parent-child relationship.
+It should also be noted that phy_power_on and phy_power_off performs
+phy_pm_runtime_get_sync and phy_pm_runtime_put respectively.
+There are exported APIs like phy_pm_runtime_get, phy_pm_runtime_get_sync,
+phy_pm_runtime_put, phy_pm_runtime_put_sync, phy_pm_runtime_allow and
+phy_pm_runtime_forbid for performing PM operations.
+
+PHY Mappings
+============
+
+In order to get reference to a PHY without help from DeviceTree, the framework
+offers lookups which can be compared to clkdev that allow clk structures to be
+bound to devices. A lookup can be made during runtime when a handle to the
+struct phy already exists.
+
+The framework offers the following API for registering and unregistering the
+lookups::
+
+ int phy_create_lookup(struct phy *phy, const char *con_id,
+ const char *dev_id);
+ void phy_remove_lookup(struct phy *phy, const char *con_id,
+ const char *dev_id);
+
+DeviceTree Binding
+==================
+
+The documentation for PHY dt binding can be found @
+Documentation/devicetree/bindings/phy/phy-bindings.txt
diff --git a/Documentation/driver-api/phy/samsung-usb2.rst b/Documentation/driver-api/phy/samsung-usb2.rst
new file mode 100644
index 0000000000..c48c8b9797
--- /dev/null
+++ b/Documentation/driver-api/phy/samsung-usb2.rst
@@ -0,0 +1,137 @@
+====================================
+Samsung USB 2.0 PHY adaptation layer
+====================================
+
+1. Description
+--------------
+
+The architecture of the USB 2.0 PHY module in Samsung SoCs is similar
+among many SoCs. In spite of the similarities it proved difficult to
+create a one driver that would fit all these PHY controllers. Often
+the differences were minor and were found in particular bits of the
+registers of the PHY. In some rare cases the order of register writes or
+the PHY powering up process had to be altered. This adaptation layer is
+a compromise between having separate drivers and having a single driver
+with added support for many special cases.
+
+2. Files description
+--------------------
+
+- phy-samsung-usb2.c
+ This is the main file of the adaptation layer. This file contains
+ the probe function and provides two callbacks to the Generic PHY
+ Framework. This two callbacks are used to power on and power off the
+ phy. They carry out the common work that has to be done on all version
+ of the PHY module. Depending on which SoC was chosen they execute SoC
+ specific callbacks. The specific SoC version is selected by choosing
+ the appropriate compatible string. In addition, this file contains
+ struct of_device_id definitions for particular SoCs.
+
+- phy-samsung-usb2.h
+ This is the include file. It declares the structures used by this
+ driver. In addition it should contain extern declarations for
+ structures that describe particular SoCs.
+
+3. Supporting SoCs
+------------------
+
+To support a new SoC a new file should be added to the drivers/phy
+directory. Each SoC's configuration is stored in an instance of the
+struct samsung_usb2_phy_config::
+
+ struct samsung_usb2_phy_config {
+ const struct samsung_usb2_common_phy *phys;
+ int (*rate_to_clk)(unsigned long, u32 *);
+ unsigned int num_phys;
+ bool has_mode_switch;
+ };
+
+The num_phys is the number of phys handled by the driver. `*phys` is an
+array that contains the configuration for each phy. The has_mode_switch
+property is a boolean flag that determines whether the SoC has USB host
+and device on a single pair of pins. If so, a special register has to
+be modified to change the internal routing of these pins between a USB
+device or host module.
+
+For example the configuration for Exynos 4210 is following::
+
+ const struct samsung_usb2_phy_config exynos4210_usb2_phy_config = {
+ .has_mode_switch = 0,
+ .num_phys = EXYNOS4210_NUM_PHYS,
+ .phys = exynos4210_phys,
+ .rate_to_clk = exynos4210_rate_to_clk,
+ }
+
+- `int (*rate_to_clk)(unsigned long, u32 *)`
+
+ The rate_to_clk callback is to convert the rate of the clock
+ used as the reference clock for the PHY module to the value
+ that should be written in the hardware register.
+
+The exynos4210_phys configuration array is as follows::
+
+ static const struct samsung_usb2_common_phy exynos4210_phys[] = {
+ {
+ .label = "device",
+ .id = EXYNOS4210_DEVICE,
+ .power_on = exynos4210_power_on,
+ .power_off = exynos4210_power_off,
+ },
+ {
+ .label = "host",
+ .id = EXYNOS4210_HOST,
+ .power_on = exynos4210_power_on,
+ .power_off = exynos4210_power_off,
+ },
+ {
+ .label = "hsic0",
+ .id = EXYNOS4210_HSIC0,
+ .power_on = exynos4210_power_on,
+ .power_off = exynos4210_power_off,
+ },
+ {
+ .label = "hsic1",
+ .id = EXYNOS4210_HSIC1,
+ .power_on = exynos4210_power_on,
+ .power_off = exynos4210_power_off,
+ },
+ {},
+ };
+
+- `int (*power_on)(struct samsung_usb2_phy_instance *);`
+ `int (*power_off)(struct samsung_usb2_phy_instance *);`
+
+ These two callbacks are used to power on and power off the phy
+ by modifying appropriate registers.
+
+Final change to the driver is adding appropriate compatible value to the
+phy-samsung-usb2.c file. In case of Exynos 4210 the following lines were
+added to the struct of_device_id samsung_usb2_phy_of_match[] array::
+
+ #ifdef CONFIG_PHY_EXYNOS4210_USB2
+ {
+ .compatible = "samsung,exynos4210-usb2-phy",
+ .data = &exynos4210_usb2_phy_config,
+ },
+ #endif
+
+To add further flexibility to the driver the Kconfig file enables to
+include support for selected SoCs in the compiled driver. The Kconfig
+entry for Exynos 4210 is following::
+
+ config PHY_EXYNOS4210_USB2
+ bool "Support for Exynos 4210"
+ depends on PHY_SAMSUNG_USB2
+ depends on CPU_EXYNOS4210
+ help
+ Enable USB PHY support for Exynos 4210. This option requires that
+ Samsung USB 2.0 PHY driver is enabled and means that support for this
+ particular SoC is compiled in the driver. In case of Exynos 4210 four
+ phys are available - device, host, HSCI0 and HSCI1.
+
+The newly created file that supports the new SoC has to be also added to the
+Makefile. In case of Exynos 4210 the added line is following::
+
+ obj-$(CONFIG_PHY_EXYNOS4210_USB2) += phy-exynos4210-usb2.o
+
+After completing these steps the support for the new SoC should be ready.
diff --git a/Documentation/driver-api/pin-control.rst b/Documentation/driver-api/pin-control.rst
new file mode 100644
index 0000000000..4639912dc9
--- /dev/null
+++ b/Documentation/driver-api/pin-control.rst
@@ -0,0 +1,1455 @@
+===============================
+PINCTRL (PIN CONTROL) subsystem
+===============================
+
+This document outlines the pin control subsystem in Linux
+
+This subsystem deals with:
+
+- Enumerating and naming controllable pins
+
+- Multiplexing of pins, pads, fingers (etc) see below for details
+
+- Configuration of pins, pads, fingers (etc), such as software-controlled
+ biasing and driving mode specific pins, such as pull-up, pull-down, open drain,
+ load capacitance etc.
+
+Top-level interface
+===================
+
+Definitions:
+
+- A PIN CONTROLLER is a piece of hardware, usually a set of registers, that
+ can control PINs. It may be able to multiplex, bias, set load capacitance,
+ set drive strength, etc. for individual pins or groups of pins.
+
+- PINS are equal to pads, fingers, balls or whatever packaging input or
+ output line you want to control and these are denoted by unsigned integers
+ in the range 0..maxpin. This numberspace is local to each PIN CONTROLLER, so
+ there may be several such number spaces in a system. This pin space may
+ be sparse - i.e. there may be gaps in the space with numbers where no
+ pin exists.
+
+When a PIN CONTROLLER is instantiated, it will register a descriptor to the
+pin control framework, and this descriptor contains an array of pin descriptors
+describing the pins handled by this specific pin controller.
+
+Here is an example of a PGA (Pin Grid Array) chip seen from underneath::
+
+ A B C D E F G H
+
+ 8 o o o o o o o o
+
+ 7 o o o o o o o o
+
+ 6 o o o o o o o o
+
+ 5 o o o o o o o o
+
+ 4 o o o o o o o o
+
+ 3 o o o o o o o o
+
+ 2 o o o o o o o o
+
+ 1 o o o o o o o o
+
+To register a pin controller and name all the pins on this package we can do
+this in our driver:
+
+.. code-block:: c
+
+ #include <linux/pinctrl/pinctrl.h>
+
+ const struct pinctrl_pin_desc foo_pins[] = {
+ PINCTRL_PIN(0, "A8"),
+ PINCTRL_PIN(1, "B8"),
+ PINCTRL_PIN(2, "C8"),
+ ...
+ PINCTRL_PIN(61, "F1"),
+ PINCTRL_PIN(62, "G1"),
+ PINCTRL_PIN(63, "H1"),
+ };
+
+ static struct pinctrl_desc foo_desc = {
+ .name = "foo",
+ .pins = foo_pins,
+ .npins = ARRAY_SIZE(foo_pins),
+ .owner = THIS_MODULE,
+ };
+
+ int __init foo_init(void)
+ {
+ int error;
+
+ struct pinctrl_dev *pctl;
+
+ error = pinctrl_register_and_init(&foo_desc, <PARENT>, NULL, &pctl);
+ if (error)
+ return error;
+
+ return pinctrl_enable(pctl);
+ }
+
+To enable the pinctrl subsystem and the subgroups for PINMUX and PINCONF and
+selected drivers, you need to select them from your machine's Kconfig entry,
+since these are so tightly integrated with the machines they are used on.
+See ``arch/arm/mach-ux500/Kconfig`` for an example.
+
+Pins usually have fancier names than this. You can find these in the datasheet
+for your chip. Notice that the core pinctrl.h file provides a fancy macro
+called ``PINCTRL_PIN()`` to create the struct entries. As you can see the pins are
+enumerated from 0 in the upper left corner to 63 in the lower right corner.
+This enumeration was arbitrarily chosen, in practice you need to think
+through your numbering system so that it matches the layout of registers
+and such things in your driver, or the code may become complicated. You must
+also consider matching of offsets to the GPIO ranges that may be handled by
+the pin controller.
+
+For a padding with 467 pads, as opposed to actual pins, the enumeration will
+be like this, walking around the edge of the chip, which seems to be industry
+standard too (all these pads had names, too)::
+
+
+ 0 ..... 104
+ 466 105
+ . .
+ . .
+ 358 224
+ 357 .... 225
+
+
+Pin groups
+==========
+
+Many controllers need to deal with groups of pins, so the pin controller
+subsystem has a mechanism for enumerating groups of pins and retrieving the
+actual enumerated pins that are part of a certain group.
+
+For example, say that we have a group of pins dealing with an SPI interface
+on { 0, 8, 16, 24 }, and a group of pins dealing with an I2C interface on pins
+on { 24, 25 }.
+
+These two groups are presented to the pin control subsystem by implementing
+some generic ``pinctrl_ops`` like this:
+
+.. code-block:: c
+
+ #include <linux/pinctrl/pinctrl.h>
+
+ static const unsigned int spi0_pins[] = { 0, 8, 16, 24 };
+ static const unsigned int i2c0_pins[] = { 24, 25 };
+
+ static const struct pingroup foo_groups[] = {
+ PINCTRL_PINGROUP("spi0_grp", spi0_pins, ARRAY_SIZE(spi0_pins)),
+ PINCTRL_PINGROUP("i2c0_grp", i2c0_pins, ARRAY_SIZE(i2c0_pins)),
+ };
+
+ static int foo_get_groups_count(struct pinctrl_dev *pctldev)
+ {
+ return ARRAY_SIZE(foo_groups);
+ }
+
+ static const char *foo_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+ {
+ return foo_groups[selector].name;
+ }
+
+ static int foo_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned int selector,
+ const unsigned int **pins,
+ unsigned int *npins)
+ {
+ *pins = foo_groups[selector].pins;
+ *npins = foo_groups[selector].npins;
+ return 0;
+ }
+
+ static struct pinctrl_ops foo_pctrl_ops = {
+ .get_groups_count = foo_get_groups_count,
+ .get_group_name = foo_get_group_name,
+ .get_group_pins = foo_get_group_pins,
+ };
+
+ static struct pinctrl_desc foo_desc = {
+ ...
+ .pctlops = &foo_pctrl_ops,
+ };
+
+The pin control subsystem will call the ``.get_groups_count()`` function to
+determine the total number of legal selectors, then it will call the other functions
+to retrieve the name and pins of the group. Maintaining the data structure of
+the groups is up to the driver, this is just a simple example - in practice you
+may need more entries in your group structure, for example specific register
+ranges associated with each group and so on.
+
+
+Pin configuration
+=================
+
+Pins can sometimes be software-configured in various ways, mostly related
+to their electronic properties when used as inputs or outputs. For example you
+may be able to make an output pin high impedance (Hi-Z), or "tristate" meaning it is
+effectively disconnected. You may be able to connect an input pin to VDD or GND
+using a certain resistor value - pull up and pull down - so that the pin has a
+stable value when nothing is driving the rail it is connected to, or when it's
+unconnected.
+
+Pin configuration can be programmed by adding configuration entries into the
+mapping table; see section `Board/machine configuration`_ below.
+
+The format and meaning of the configuration parameter, PLATFORM_X_PULL_UP
+above, is entirely defined by the pin controller driver.
+
+The pin configuration driver implements callbacks for changing pin
+configuration in the pin controller ops like this:
+
+.. code-block:: c
+
+ #include <linux/pinctrl/pinconf.h>
+ #include <linux/pinctrl/pinctrl.h>
+
+ #include "platform_x_pindefs.h"
+
+ static int foo_pin_config_get(struct pinctrl_dev *pctldev,
+ unsigned int offset,
+ unsigned long *config)
+ {
+ struct my_conftype conf;
+
+ /* ... Find setting for pin @ offset ... */
+
+ *config = (unsigned long) conf;
+ }
+
+ static int foo_pin_config_set(struct pinctrl_dev *pctldev,
+ unsigned int offset,
+ unsigned long config)
+ {
+ struct my_conftype *conf = (struct my_conftype *) config;
+
+ switch (conf) {
+ case PLATFORM_X_PULL_UP:
+ ...
+ break;
+ }
+ }
+
+ static int foo_pin_config_group_get(struct pinctrl_dev *pctldev,
+ unsigned selector,
+ unsigned long *config)
+ {
+ ...
+ }
+
+ static int foo_pin_config_group_set(struct pinctrl_dev *pctldev,
+ unsigned selector,
+ unsigned long config)
+ {
+ ...
+ }
+
+ static struct pinconf_ops foo_pconf_ops = {
+ .pin_config_get = foo_pin_config_get,
+ .pin_config_set = foo_pin_config_set,
+ .pin_config_group_get = foo_pin_config_group_get,
+ .pin_config_group_set = foo_pin_config_group_set,
+ };
+
+ /* Pin config operations are handled by some pin controller */
+ static struct pinctrl_desc foo_desc = {
+ ...
+ .confops = &foo_pconf_ops,
+ };
+
+Interaction with the GPIO subsystem
+===================================
+
+The GPIO drivers may want to perform operations of various types on the same
+physical pins that are also registered as pin controller pins.
+
+First and foremost, the two subsystems can be used as completely orthogonal,
+see the section named `Pin control requests from drivers`_ and
+`Drivers needing both pin control and GPIOs`_ below for details. But in some
+situations a cross-subsystem mapping between pins and GPIOs is needed.
+
+Since the pin controller subsystem has its pinspace local to the pin controller
+we need a mapping so that the pin control subsystem can figure out which pin
+controller handles control of a certain GPIO pin. Since a single pin controller
+may be muxing several GPIO ranges (typically SoCs that have one set of pins,
+but internally several GPIO silicon blocks, each modelled as a struct
+gpio_chip) any number of GPIO ranges can be added to a pin controller instance
+like this:
+
+.. code-block:: c
+
+ #include <linux/gpio/driver.h>
+
+ #include <linux/pinctrl/pinctrl.h>
+
+ struct gpio_chip chip_a;
+ struct gpio_chip chip_b;
+
+ static struct pinctrl_gpio_range gpio_range_a = {
+ .name = "chip a",
+ .id = 0,
+ .base = 32,
+ .pin_base = 32,
+ .npins = 16,
+ .gc = &chip_a,
+ };
+
+ static struct pinctrl_gpio_range gpio_range_b = {
+ .name = "chip b",
+ .id = 0,
+ .base = 48,
+ .pin_base = 64,
+ .npins = 8,
+ .gc = &chip_b;
+ };
+
+ int __init foo_init(void)
+ {
+ struct pinctrl_dev *pctl;
+ ...
+ pinctrl_add_gpio_range(pctl, &gpio_range_a);
+ pinctrl_add_gpio_range(pctl, &gpio_range_b);
+ ...
+ }
+
+So this complex system has one pin controller handling two different
+GPIO chips. "chip a" has 16 pins and "chip b" has 8 pins. The "chip a" and
+"chip b" have different ``pin_base``, which means a start pin number of the
+GPIO range.
+
+The GPIO range of "chip a" starts from the GPIO base of 32 and actual
+pin range also starts from 32. However "chip b" has different starting
+offset for the GPIO range and pin range. The GPIO range of "chip b" starts
+from GPIO number 48, while the pin range of "chip b" starts from 64.
+
+We can convert a gpio number to actual pin number using this ``pin_base``.
+They are mapped in the global GPIO pin space at:
+
+chip a:
+ - GPIO range : [32 .. 47]
+ - pin range : [32 .. 47]
+chip b:
+ - GPIO range : [48 .. 55]
+ - pin range : [64 .. 71]
+
+The above examples assume the mapping between the GPIOs and pins is
+linear. If the mapping is sparse or haphazard, an array of arbitrary pin
+numbers can be encoded in the range like this:
+
+.. code-block:: c
+
+ static const unsigned int range_pins[] = { 14, 1, 22, 17, 10, 8, 6, 2 };
+
+ static struct pinctrl_gpio_range gpio_range = {
+ .name = "chip",
+ .id = 0,
+ .base = 32,
+ .pins = &range_pins,
+ .npins = ARRAY_SIZE(range_pins),
+ .gc = &chip,
+ };
+
+In this case the ``pin_base`` property will be ignored. If the name of a pin
+group is known, the pins and npins elements of the above structure can be
+initialised using the function ``pinctrl_get_group_pins()``, e.g. for pin
+group "foo":
+
+.. code-block:: c
+
+ pinctrl_get_group_pins(pctl, "foo", &gpio_range.pins, &gpio_range.npins);
+
+When GPIO-specific functions in the pin control subsystem are called, these
+ranges will be used to look up the appropriate pin controller by inspecting
+and matching the pin to the pin ranges across all controllers. When a
+pin controller handling the matching range is found, GPIO-specific functions
+will be called on that specific pin controller.
+
+For all functionalities dealing with pin biasing, pin muxing etc, the pin
+controller subsystem will look up the corresponding pin number from the passed
+in gpio number, and use the range's internals to retrieve a pin number. After
+that, the subsystem passes it on to the pin control driver, so the driver
+will get a pin number into its handled number range. Further it is also passed
+the range ID value, so that the pin controller knows which range it should
+deal with.
+
+Calling ``pinctrl_add_gpio_range()`` from pinctrl driver is DEPRECATED. Please see
+section 2.1 of ``Documentation/devicetree/bindings/gpio/gpio.txt`` on how to bind
+pinctrl and gpio drivers.
+
+
+PINMUX interfaces
+=================
+
+These calls use the pinmux_* naming prefix. No other calls should use that
+prefix.
+
+
+What is pinmuxing?
+==================
+
+PINMUX, also known as padmux, ballmux, alternate functions or mission modes
+is a way for chip vendors producing some kind of electrical packages to use
+a certain physical pin (ball, pad, finger, etc) for multiple mutually exclusive
+functions, depending on the application. By "application" in this context
+we usually mean a way of soldering or wiring the package into an electronic
+system, even though the framework makes it possible to also change the function
+at runtime.
+
+Here is an example of a PGA (Pin Grid Array) chip seen from underneath::
+
+ A B C D E F G H
+ +---+
+ 8 | o | o o o o o o o
+ | |
+ 7 | o | o o o o o o o
+ | |
+ 6 | o | o o o o o o o
+ +---+---+
+ 5 | o | o | o o o o o o
+ +---+---+ +---+
+ 4 o o o o o o | o | o
+ | |
+ 3 o o o o o o | o | o
+ | |
+ 2 o o o o o o | o | o
+ +-------+-------+-------+---+---+
+ 1 | o o | o o | o o | o | o |
+ +-------+-------+-------+---+---+
+
+This is not tetris. The game to think of is chess. Not all PGA/BGA packages
+are chessboard-like, big ones have "holes" in some arrangement according to
+different design patterns, but we're using this as a simple example. Of the
+pins you see some will be taken by things like a few VCC and GND to feed power
+to the chip, and quite a few will be taken by large ports like an external
+memory interface. The remaining pins will often be subject to pin multiplexing.
+
+The example 8x8 PGA package above will have pin numbers 0 through 63 assigned
+to its physical pins. It will name the pins { A1, A2, A3 ... H6, H7, H8 } using
+pinctrl_register_pins() and a suitable data set as shown earlier.
+
+In this 8x8 BGA package the pins { A8, A7, A6, A5 } can be used as an SPI port
+(these are four pins: CLK, RXD, TXD, FRM). In that case, pin B5 can be used as
+some general-purpose GPIO pin. However, in another setting, pins { A5, B5 } can
+be used as an I2C port (these are just two pins: SCL, SDA). Needless to say,
+we cannot use the SPI port and I2C port at the same time. However in the inside
+of the package the silicon performing the SPI logic can alternatively be routed
+out on pins { G4, G3, G2, G1 }.
+
+On the bottom row at { A1, B1, C1, D1, E1, F1, G1, H1 } we have something
+special - it's an external MMC bus that can be 2, 4 or 8 bits wide, and it will
+consume 2, 4 or 8 pins respectively, so either { A1, B1 } are taken or
+{ A1, B1, C1, D1 } or all of them. If we use all 8 bits, we cannot use the SPI
+port on pins { G4, G3, G2, G1 } of course.
+
+This way the silicon blocks present inside the chip can be multiplexed "muxed"
+out on different pin ranges. Often contemporary SoC (systems on chip) will
+contain several I2C, SPI, SDIO/MMC, etc silicon blocks that can be routed to
+different pins by pinmux settings.
+
+Since general-purpose I/O pins (GPIO) are typically always in shortage, it is
+common to be able to use almost any pin as a GPIO pin if it is not currently
+in use by some other I/O port.
+
+
+Pinmux conventions
+==================
+
+The purpose of the pinmux functionality in the pin controller subsystem is to
+abstract and provide pinmux settings to the devices you choose to instantiate
+in your machine configuration. It is inspired by the clk, GPIO and regulator
+subsystems, so devices will request their mux setting, but it's also possible
+to request a single pin for e.g. GPIO.
+
+The conventions are:
+
+- FUNCTIONS can be switched in and out by a driver residing with the pin
+ control subsystem in the ``drivers/pinctrl`` directory of the kernel. The
+ pin control driver knows the possible functions. In the example above you can
+ identify three pinmux functions, one for spi, one for i2c and one for mmc.
+
+- FUNCTIONS are assumed to be enumerable from zero in a one-dimensional array.
+ In this case the array could be something like: { spi0, i2c0, mmc0 }
+ for the three available functions.
+
+- FUNCTIONS have PIN GROUPS as defined on the generic level - so a certain
+ function is *always* associated with a certain set of pin groups, could
+ be just a single one, but could also be many. In the example above the
+ function i2c is associated with the pins { A5, B5 }, enumerated as
+ { 24, 25 } in the controller pin space.
+
+ The Function spi is associated with pin groups { A8, A7, A6, A5 }
+ and { G4, G3, G2, G1 }, which are enumerated as { 0, 8, 16, 24 } and
+ { 38, 46, 54, 62 } respectively.
+
+ Group names must be unique per pin controller, no two groups on the same
+ controller may have the same name.
+
+- The combination of a FUNCTION and a PIN GROUP determine a certain function
+ for a certain set of pins. The knowledge of the functions and pin groups
+ and their machine-specific particulars are kept inside the pinmux driver,
+ from the outside only the enumerators are known, and the driver core can
+ request:
+
+ - The name of a function with a certain selector (>= 0)
+ - A list of groups associated with a certain function
+ - That a certain group in that list to be activated for a certain function
+
+ As already described above, pin groups are in turn self-descriptive, so
+ the core will retrieve the actual pin range in a certain group from the
+ driver.
+
+- FUNCTIONS and GROUPS on a certain PIN CONTROLLER are MAPPED to a certain
+ device by the board file, device tree or similar machine setup configuration
+ mechanism, similar to how regulators are connected to devices, usually by
+ name. Defining a pin controller, function and group thus uniquely identify
+ the set of pins to be used by a certain device. (If only one possible group
+ of pins is available for the function, no group name need to be supplied -
+ the core will simply select the first and only group available.)
+
+ In the example case we can define that this particular machine shall
+ use device spi0 with pinmux function fspi0 group gspi0 and i2c0 on function
+ fi2c0 group gi2c0, on the primary pin controller, we get mappings
+ like these:
+
+ .. code-block:: c
+
+ {
+ {"map-spi0", spi0, pinctrl0, fspi0, gspi0},
+ {"map-i2c0", i2c0, pinctrl0, fi2c0, gi2c0},
+ }
+
+ Every map must be assigned a state name, pin controller, device and
+ function. The group is not compulsory - if it is omitted the first group
+ presented by the driver as applicable for the function will be selected,
+ which is useful for simple cases.
+
+ It is possible to map several groups to the same combination of device,
+ pin controller and function. This is for cases where a certain function on
+ a certain pin controller may use different sets of pins in different
+ configurations.
+
+- PINS for a certain FUNCTION using a certain PIN GROUP on a certain
+ PIN CONTROLLER are provided on a first-come first-serve basis, so if some
+ other device mux setting or GPIO pin request has already taken your physical
+ pin, you will be denied the use of it. To get (activate) a new setting, the
+ old one has to be put (deactivated) first.
+
+Sometimes the documentation and hardware registers will be oriented around
+pads (or "fingers") rather than pins - these are the soldering surfaces on the
+silicon inside the package, and may or may not match the actual number of
+pins/balls underneath the capsule. Pick some enumeration that makes sense to
+you. Define enumerators only for the pins you can control if that makes sense.
+
+Assumptions:
+
+We assume that the number of possible function maps to pin groups is limited by
+the hardware. I.e. we assume that there is no system where any function can be
+mapped to any pin, like in a phone exchange. So the available pin groups for
+a certain function will be limited to a few choices (say up to eight or so),
+not hundreds or any amount of choices. This is the characteristic we have found
+by inspecting available pinmux hardware, and a necessary assumption since we
+expect pinmux drivers to present *all* possible function vs pin group mappings
+to the subsystem.
+
+
+Pinmux drivers
+==============
+
+The pinmux core takes care of preventing conflicts on pins and calling
+the pin controller driver to execute different settings.
+
+It is the responsibility of the pinmux driver to impose further restrictions
+(say for example infer electronic limitations due to load, etc.) to determine
+whether or not the requested function can actually be allowed, and in case it
+is possible to perform the requested mux setting, poke the hardware so that
+this happens.
+
+Pinmux drivers are required to supply a few callback functions, some are
+optional. Usually the ``.set_mux()`` function is implemented, writing values into
+some certain registers to activate a certain mux setting for a certain pin.
+
+A simple driver for the above example will work by setting bits 0, 1, 2, 3, 4, or 5
+into some register named MUX to select a certain function with a certain
+group of pins would work something like this:
+
+.. code-block:: c
+
+ #include <linux/pinctrl/pinctrl.h>
+ #include <linux/pinctrl/pinmux.h>
+
+ static const unsigned int spi0_0_pins[] = { 0, 8, 16, 24 };
+ static const unsigned int spi0_1_pins[] = { 38, 46, 54, 62 };
+ static const unsigned int i2c0_pins[] = { 24, 25 };
+ static const unsigned int mmc0_1_pins[] = { 56, 57 };
+ static const unsigned int mmc0_2_pins[] = { 58, 59 };
+ static const unsigned int mmc0_3_pins[] = { 60, 61, 62, 63 };
+
+ static const struct pingroup foo_groups[] = {
+ PINCTRL_PINGROUP("spi0_0_grp", spi0_0_pins, ARRAY_SIZE(spi0_0_pins)),
+ PINCTRL_PINGROUP("spi0_1_grp", spi0_1_pins, ARRAY_SIZE(spi0_1_pins)),
+ PINCTRL_PINGROUP("i2c0_grp", i2c0_pins, ARRAY_SIZE(i2c0_pins)),
+ PINCTRL_PINGROUP("mmc0_1_grp", mmc0_1_pins, ARRAY_SIZE(mmc0_1_pins)),
+ PINCTRL_PINGROUP("mmc0_2_grp", mmc0_2_pins, ARRAY_SIZE(mmc0_2_pins)),
+ PINCTRL_PINGROUP("mmc0_3_grp", mmc0_3_pins, ARRAY_SIZE(mmc0_3_pins)),
+ };
+
+ static int foo_get_groups_count(struct pinctrl_dev *pctldev)
+ {
+ return ARRAY_SIZE(foo_groups);
+ }
+
+ static const char *foo_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+ {
+ return foo_groups[selector].name;
+ }
+
+ static int foo_get_group_pins(struct pinctrl_dev *pctldev, unsigned int selector,
+ const unsigned int **pins,
+ unsigned int *npins)
+ {
+ *pins = foo_groups[selector].pins;
+ *npins = foo_groups[selector].npins;
+ return 0;
+ }
+
+ static struct pinctrl_ops foo_pctrl_ops = {
+ .get_groups_count = foo_get_groups_count,
+ .get_group_name = foo_get_group_name,
+ .get_group_pins = foo_get_group_pins,
+ };
+
+ static const char * const spi0_groups[] = { "spi0_0_grp", "spi0_1_grp" };
+ static const char * const i2c0_groups[] = { "i2c0_grp" };
+ static const char * const mmc0_groups[] = { "mmc0_1_grp", "mmc0_2_grp", "mmc0_3_grp" };
+
+ static const struct pinfunction foo_functions[] = {
+ PINCTRL_PINFUNCTION("spi0", spi0_groups, ARRAY_SIZE(spi0_groups)),
+ PINCTRL_PINFUNCTION("i2c0", i2c0_groups, ARRAY_SIZE(i2c0_groups)),
+ PINCTRL_PINFUNCTION("mmc0", mmc0_groups, ARRAY_SIZE(mmc0_groups)),
+ };
+
+ static int foo_get_functions_count(struct pinctrl_dev *pctldev)
+ {
+ return ARRAY_SIZE(foo_functions);
+ }
+
+ static const char *foo_get_fname(struct pinctrl_dev *pctldev, unsigned int selector)
+ {
+ return foo_functions[selector].name;
+ }
+
+ static int foo_get_groups(struct pinctrl_dev *pctldev, unsigned int selector,
+ const char * const **groups,
+ unsigned int * const ngroups)
+ {
+ *groups = foo_functions[selector].groups;
+ *ngroups = foo_functions[selector].ngroups;
+ return 0;
+ }
+
+ static int foo_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
+ unsigned int group)
+ {
+ u8 regbit = BIT(group);
+
+ writeb((readb(MUX) | regbit), MUX);
+ return 0;
+ }
+
+ static struct pinmux_ops foo_pmxops = {
+ .get_functions_count = foo_get_functions_count,
+ .get_function_name = foo_get_fname,
+ .get_function_groups = foo_get_groups,
+ .set_mux = foo_set_mux,
+ .strict = true,
+ };
+
+ /* Pinmux operations are handled by some pin controller */
+ static struct pinctrl_desc foo_desc = {
+ ...
+ .pctlops = &foo_pctrl_ops,
+ .pmxops = &foo_pmxops,
+ };
+
+In the example activating muxing 0 and 2 at the same time setting bits
+0 and 2, uses pin 24 in common so they would collide. All the same for
+the muxes 1 and 5, which have pin 62 in common.
+
+The beauty of the pinmux subsystem is that since it keeps track of all
+pins and who is using them, it will already have denied an impossible
+request like that, so the driver does not need to worry about such
+things - when it gets a selector passed in, the pinmux subsystem makes
+sure no other device or GPIO assignment is already using the selected
+pins. Thus bits 0 and 2, or 1 and 5 in the control register will never
+be set at the same time.
+
+All the above functions are mandatory to implement for a pinmux driver.
+
+
+Pin control interaction with the GPIO subsystem
+===============================================
+
+Note that the following implies that the use case is to use a certain pin
+from the Linux kernel using the API in ``<linux/gpio/consumer.h>`` with gpiod_get()
+and similar functions. There are cases where you may be using something
+that your datasheet calls "GPIO mode", but actually is just an electrical
+configuration for a certain device. See the section below named
+`GPIO mode pitfalls`_ for more details on this scenario.
+
+The public pinmux API contains two functions named ``pinctrl_gpio_request()``
+and ``pinctrl_gpio_free()``. These two functions shall *ONLY* be called from
+gpiolib-based drivers as part of their ``.request()`` and ``.free()`` semantics.
+Likewise the ``pinctrl_gpio_direction_input()`` / ``pinctrl_gpio_direction_output()``
+shall only be called from within respective ``.direction_input()`` /
+``.direction_output()`` gpiolib implementation.
+
+NOTE that platforms and individual drivers shall *NOT* request GPIO pins to be
+controlled e.g. muxed in. Instead, implement a proper gpiolib driver and have
+that driver request proper muxing and other control for its pins.
+
+The function list could become long, especially if you can convert every
+individual pin into a GPIO pin independent of any other pins, and then try
+the approach to define every pin as a function.
+
+In this case, the function array would become 64 entries for each GPIO
+setting and then the device functions.
+
+For this reason there are two functions a pin control driver can implement
+to enable only GPIO on an individual pin: ``.gpio_request_enable()`` and
+``.gpio_disable_free()``.
+
+This function will pass in the affected GPIO range identified by the pin
+controller core, so you know which GPIO pins are being affected by the request
+operation.
+
+If your driver needs to have an indication from the framework of whether the
+GPIO pin shall be used for input or output you can implement the
+``.gpio_set_direction()`` function. As described this shall be called from the
+gpiolib driver and the affected GPIO range, pin offset and desired direction
+will be passed along to this function.
+
+Alternatively to using these special functions, it is fully allowed to use
+named functions for each GPIO pin, the ``pinctrl_gpio_request()`` will attempt to
+obtain the function "gpioN" where "N" is the global GPIO pin number if no
+special GPIO-handler is registered.
+
+
+GPIO mode pitfalls
+==================
+
+Due to the naming conventions used by hardware engineers, where "GPIO"
+is taken to mean different things than what the kernel does, the developer
+may be confused by a datasheet talking about a pin being possible to set
+into "GPIO mode". It appears that what hardware engineers mean with
+"GPIO mode" is not necessarily the use case that is implied in the kernel
+interface ``<linux/gpio/consumer.h>``: a pin that you grab from kernel code and then
+either listen for input or drive high/low to assert/deassert some
+external line.
+
+Rather hardware engineers think that "GPIO mode" means that you can
+software-control a few electrical properties of the pin that you would
+not be able to control if the pin was in some other mode, such as muxed in
+for a device.
+
+The GPIO portions of a pin and its relation to a certain pin controller
+configuration and muxing logic can be constructed in several ways. Here
+are two examples.
+
+Example **(A)**::
+
+ pin config
+ logic regs
+ | +- SPI
+ Physical pins --- pad --- pinmux -+- I2C
+ | +- mmc
+ | +- GPIO
+ pin
+ multiplex
+ logic regs
+
+Here some electrical properties of the pin can be configured no matter
+whether the pin is used for GPIO or not. If you multiplex a GPIO onto a
+pin, you can also drive it high/low from "GPIO" registers.
+Alternatively, the pin can be controlled by a certain peripheral, while
+still applying desired pin config properties. GPIO functionality is thus
+orthogonal to any other device using the pin.
+
+In this arrangement the registers for the GPIO portions of the pin controller,
+or the registers for the GPIO hardware module are likely to reside in a
+separate memory range only intended for GPIO driving, and the register
+range dealing with pin config and pin multiplexing get placed into a
+different memory range and a separate section of the data sheet.
+
+A flag "strict" in struct pinmux_ops is available to check and deny
+simultaneous access to the same pin from GPIO and pin multiplexing
+consumers on hardware of this type. The pinctrl driver should set this flag
+accordingly.
+
+Example **(B)**::
+
+ pin config
+ logic regs
+ | +- SPI
+ Physical pins --- pad --- pinmux -+- I2C
+ | | +- mmc
+ | |
+ GPIO pin
+ multiplex
+ logic regs
+
+In this arrangement, the GPIO functionality can always be enabled, such that
+e.g. a GPIO input can be used to "spy" on the SPI/I2C/MMC signal while it is
+pulsed out. It is likely possible to disrupt the traffic on the pin by doing
+wrong things on the GPIO block, as it is never really disconnected. It is
+possible that the GPIO, pin config and pin multiplex registers are placed into
+the same memory range and the same section of the data sheet, although that
+need not be the case.
+
+In some pin controllers, although the physical pins are designed in the same
+way as (B), the GPIO function still can't be enabled at the same time as the
+peripheral functions. So again the "strict" flag should be set, denying
+simultaneous activation by GPIO and other muxed in devices.
+
+From a kernel point of view, however, these are different aspects of the
+hardware and shall be put into different subsystems:
+
+- Registers (or fields within registers) that control electrical
+ properties of the pin such as biasing and drive strength should be
+ exposed through the pinctrl subsystem, as "pin configuration" settings.
+
+- Registers (or fields within registers) that control muxing of signals
+ from various other HW blocks (e.g. I2C, MMC, or GPIO) onto pins should
+ be exposed through the pinctrl subsystem, as mux functions.
+
+- Registers (or fields within registers) that control GPIO functionality
+ such as setting a GPIO's output value, reading a GPIO's input value, or
+ setting GPIO pin direction should be exposed through the GPIO subsystem,
+ and if they also support interrupt capabilities, through the irqchip
+ abstraction.
+
+Depending on the exact HW register design, some functions exposed by the
+GPIO subsystem may call into the pinctrl subsystem in order to
+coordinate register settings across HW modules. In particular, this may
+be needed for HW with separate GPIO and pin controller HW modules, where
+e.g. GPIO direction is determined by a register in the pin controller HW
+module rather than the GPIO HW module.
+
+Electrical properties of the pin such as biasing and drive strength
+may be placed at some pin-specific register in all cases or as part
+of the GPIO register in case (B) especially. This doesn't mean that such
+properties necessarily pertain to what the Linux kernel calls "GPIO".
+
+Example: a pin is usually muxed in to be used as a UART TX line. But during
+system sleep, we need to put this pin into "GPIO mode" and ground it.
+
+If you make a 1-to-1 map to the GPIO subsystem for this pin, you may start
+to think that you need to come up with something really complex, that the
+pin shall be used for UART TX and GPIO at the same time, that you will grab
+a pin control handle and set it to a certain state to enable UART TX to be
+muxed in, then twist it over to GPIO mode and use gpiod_direction_output()
+to drive it low during sleep, then mux it over to UART TX again when you
+wake up and maybe even gpiod_get() / gpiod_put() as part of this cycle. This
+all gets very complicated.
+
+The solution is to not think that what the datasheet calls "GPIO mode"
+has to be handled by the ``<linux/gpio/consumer.h>`` interface. Instead view this as
+a certain pin config setting. Look in e.g. ``<linux/pinctrl/pinconf-generic.h>``
+and you find this in the documentation:
+
+ PIN_CONFIG_OUTPUT:
+ this will configure the pin in output, use argument
+ 1 to indicate high level, argument 0 to indicate low level.
+
+So it is perfectly possible to push a pin into "GPIO mode" and drive the
+line low as part of the usual pin control map. So for example your UART
+driver may look like this:
+
+.. code-block:: c
+
+ #include <linux/pinctrl/consumer.h>
+
+ struct pinctrl *pinctrl;
+ struct pinctrl_state *pins_default;
+ struct pinctrl_state *pins_sleep;
+
+ pins_default = pinctrl_lookup_state(uap->pinctrl, PINCTRL_STATE_DEFAULT);
+ pins_sleep = pinctrl_lookup_state(uap->pinctrl, PINCTRL_STATE_SLEEP);
+
+ /* Normal mode */
+ retval = pinctrl_select_state(pinctrl, pins_default);
+
+ /* Sleep mode */
+ retval = pinctrl_select_state(pinctrl, pins_sleep);
+
+And your machine configuration may look like this:
+
+.. code-block:: c
+
+ static unsigned long uart_default_mode[] = {
+ PIN_CONF_PACKED(PIN_CONFIG_DRIVE_PUSH_PULL, 0),
+ };
+
+ static unsigned long uart_sleep_mode[] = {
+ PIN_CONF_PACKED(PIN_CONFIG_OUTPUT, 0),
+ };
+
+ static struct pinctrl_map pinmap[] __initdata = {
+ PIN_MAP_MUX_GROUP("uart", PINCTRL_STATE_DEFAULT, "pinctrl-foo",
+ "u0_group", "u0"),
+ PIN_MAP_CONFIGS_PIN("uart", PINCTRL_STATE_DEFAULT, "pinctrl-foo",
+ "UART_TX_PIN", uart_default_mode),
+ PIN_MAP_MUX_GROUP("uart", PINCTRL_STATE_SLEEP, "pinctrl-foo",
+ "u0_group", "gpio-mode"),
+ PIN_MAP_CONFIGS_PIN("uart", PINCTRL_STATE_SLEEP, "pinctrl-foo",
+ "UART_TX_PIN", uart_sleep_mode),
+ };
+
+ foo_init(void)
+ {
+ pinctrl_register_mappings(pinmap, ARRAY_SIZE(pinmap));
+ }
+
+Here the pins we want to control are in the "u0_group" and there is some
+function called "u0" that can be enabled on this group of pins, and then
+everything is UART business as usual. But there is also some function
+named "gpio-mode" that can be mapped onto the same pins to move them into
+GPIO mode.
+
+This will give the desired effect without any bogus interaction with the
+GPIO subsystem. It is just an electrical configuration used by that device
+when going to sleep, it might imply that the pin is set into something the
+datasheet calls "GPIO mode", but that is not the point: it is still used
+by that UART device to control the pins that pertain to that very UART
+driver, putting them into modes needed by the UART. GPIO in the Linux
+kernel sense are just some 1-bit line, and is a different use case.
+
+How the registers are poked to attain the push or pull, and output low
+configuration and the muxing of the "u0" or "gpio-mode" group onto these
+pins is a question for the driver.
+
+Some datasheets will be more helpful and refer to the "GPIO mode" as
+"low power mode" rather than anything to do with GPIO. This often means
+the same thing electrically speaking, but in this latter case the
+software engineers will usually quickly identify that this is some
+specific muxing or configuration rather than anything related to the GPIO
+API.
+
+
+Board/machine configuration
+===========================
+
+Boards and machines define how a certain complete running system is put
+together, including how GPIOs and devices are muxed, how regulators are
+constrained and how the clock tree looks. Of course pinmux settings are also
+part of this.
+
+A pin controller configuration for a machine looks pretty much like a simple
+regulator configuration, so for the example array above we want to enable i2c
+and spi on the second function mapping:
+
+.. code-block:: c
+
+ #include <linux/pinctrl/machine.h>
+
+ static const struct pinctrl_map mapping[] __initconst = {
+ {
+ .dev_name = "foo-spi.0",
+ .name = PINCTRL_STATE_DEFAULT,
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .data.mux.function = "spi0",
+ },
+ {
+ .dev_name = "foo-i2c.0",
+ .name = PINCTRL_STATE_DEFAULT,
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .data.mux.function = "i2c0",
+ },
+ {
+ .dev_name = "foo-mmc.0",
+ .name = PINCTRL_STATE_DEFAULT,
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .data.mux.function = "mmc0",
+ },
+ };
+
+The dev_name here matches to the unique device name that can be used to look
+up the device struct (just like with clockdev or regulators). The function name
+must match a function provided by the pinmux driver handling this pin range.
+
+As you can see we may have several pin controllers on the system and thus
+we need to specify which one of them contains the functions we wish to map.
+
+You register this pinmux mapping to the pinmux subsystem by simply:
+
+.. code-block:: c
+
+ ret = pinctrl_register_mappings(mapping, ARRAY_SIZE(mapping));
+
+Since the above construct is pretty common there is a helper macro to make
+it even more compact which assumes you want to use pinctrl-foo and position
+0 for mapping, for example:
+
+.. code-block:: c
+
+ static struct pinctrl_map mapping[] __initdata = {
+ PIN_MAP_MUX_GROUP("foo-i2c.o", PINCTRL_STATE_DEFAULT,
+ "pinctrl-foo", NULL, "i2c0"),
+ };
+
+The mapping table may also contain pin configuration entries. It's common for
+each pin/group to have a number of configuration entries that affect it, so
+the table entries for configuration reference an array of config parameters
+and values. An example using the convenience macros is shown below:
+
+.. code-block:: c
+
+ static unsigned long i2c_grp_configs[] = {
+ FOO_PIN_DRIVEN,
+ FOO_PIN_PULLUP,
+ };
+
+ static unsigned long i2c_pin_configs[] = {
+ FOO_OPEN_COLLECTOR,
+ FOO_SLEW_RATE_SLOW,
+ };
+
+ static struct pinctrl_map mapping[] __initdata = {
+ PIN_MAP_MUX_GROUP("foo-i2c.0", PINCTRL_STATE_DEFAULT,
+ "pinctrl-foo", "i2c0", "i2c0"),
+ PIN_MAP_CONFIGS_GROUP("foo-i2c.0", PINCTRL_STATE_DEFAULT,
+ "pinctrl-foo", "i2c0", i2c_grp_configs),
+ PIN_MAP_CONFIGS_PIN("foo-i2c.0", PINCTRL_STATE_DEFAULT,
+ "pinctrl-foo", "i2c0scl", i2c_pin_configs),
+ PIN_MAP_CONFIGS_PIN("foo-i2c.0", PINCTRL_STATE_DEFAULT,
+ "pinctrl-foo", "i2c0sda", i2c_pin_configs),
+ };
+
+Finally, some devices expect the mapping table to contain certain specific
+named states. When running on hardware that doesn't need any pin controller
+configuration, the mapping table must still contain those named states, in
+order to explicitly indicate that the states were provided and intended to
+be empty. Table entry macro ``PIN_MAP_DUMMY_STATE()`` serves the purpose of defining
+a named state without causing any pin controller to be programmed:
+
+.. code-block:: c
+
+ static struct pinctrl_map mapping[] __initdata = {
+ PIN_MAP_DUMMY_STATE("foo-i2c.0", PINCTRL_STATE_DEFAULT),
+ };
+
+
+Complex mappings
+================
+
+As it is possible to map a function to different groups of pins an optional
+.group can be specified like this:
+
+.. code-block:: c
+
+ ...
+ {
+ .dev_name = "foo-spi.0",
+ .name = "spi0-pos-A",
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .function = "spi0",
+ .group = "spi0_0_grp",
+ },
+ {
+ .dev_name = "foo-spi.0",
+ .name = "spi0-pos-B",
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .function = "spi0",
+ .group = "spi0_1_grp",
+ },
+ ...
+
+This example mapping is used to switch between two positions for spi0 at
+runtime, as described further below under the heading `Runtime pinmuxing`_.
+
+Further it is possible for one named state to affect the muxing of several
+groups of pins, say for example in the mmc0 example above, where you can
+additively expand the mmc0 bus from 2 to 4 to 8 pins. If we want to use all
+three groups for a total of 2 + 2 + 4 = 8 pins (for an 8-bit MMC bus as is the
+case), we define a mapping like this:
+
+.. code-block:: c
+
+ ...
+ {
+ .dev_name = "foo-mmc.0",
+ .name = "2bit"
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .function = "mmc0",
+ .group = "mmc0_1_grp",
+ },
+ {
+ .dev_name = "foo-mmc.0",
+ .name = "4bit"
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .function = "mmc0",
+ .group = "mmc0_1_grp",
+ },
+ {
+ .dev_name = "foo-mmc.0",
+ .name = "4bit"
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .function = "mmc0",
+ .group = "mmc0_2_grp",
+ },
+ {
+ .dev_name = "foo-mmc.0",
+ .name = "8bit"
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .function = "mmc0",
+ .group = "mmc0_1_grp",
+ },
+ {
+ .dev_name = "foo-mmc.0",
+ .name = "8bit"
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .function = "mmc0",
+ .group = "mmc0_2_grp",
+ },
+ {
+ .dev_name = "foo-mmc.0",
+ .name = "8bit"
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .function = "mmc0",
+ .group = "mmc0_3_grp",
+ },
+ ...
+
+The result of grabbing this mapping from the device with something like
+this (see next paragraph):
+
+.. code-block:: c
+
+ p = devm_pinctrl_get(dev);
+ s = pinctrl_lookup_state(p, "8bit");
+ ret = pinctrl_select_state(p, s);
+
+or more simply:
+
+.. code-block:: c
+
+ p = devm_pinctrl_get_select(dev, "8bit");
+
+Will be that you activate all the three bottom records in the mapping at
+once. Since they share the same name, pin controller device, function and
+device, and since we allow multiple groups to match to a single device, they
+all get selected, and they all get enabled and disable simultaneously by the
+pinmux core.
+
+
+Pin control requests from drivers
+=================================
+
+When a device driver is about to probe the device core will automatically
+attempt to issue ``pinctrl_get_select_default()`` on these devices.
+This way driver writers do not need to add any of the boilerplate code
+of the type found below. However when doing fine-grained state selection
+and not using the "default" state, you may have to do some device driver
+handling of the pinctrl handles and states.
+
+So if you just want to put the pins for a certain device into the default
+state and be done with it, there is nothing you need to do besides
+providing the proper mapping table. The device core will take care of
+the rest.
+
+Generally it is discouraged to let individual drivers get and enable pin
+control. So if possible, handle the pin control in platform code or some other
+place where you have access to all the affected struct device * pointers. In
+some cases where a driver needs to e.g. switch between different mux mappings
+at runtime this is not possible.
+
+A typical case is if a driver needs to switch bias of pins from normal
+operation and going to sleep, moving from the ``PINCTRL_STATE_DEFAULT`` to
+``PINCTRL_STATE_SLEEP`` at runtime, re-biasing or even re-muxing pins to save
+current in sleep mode.
+
+A driver may request a certain control state to be activated, usually just the
+default state like this:
+
+.. code-block:: c
+
+ #include <linux/pinctrl/consumer.h>
+
+ struct foo_state {
+ struct pinctrl *p;
+ struct pinctrl_state *s;
+ ...
+ };
+
+ foo_probe()
+ {
+ /* Allocate a state holder named "foo" etc */
+ struct foo_state *foo = ...;
+
+ foo->p = devm_pinctrl_get(&device);
+ if (IS_ERR(foo->p)) {
+ /* FIXME: clean up "foo" here */
+ return PTR_ERR(foo->p);
+ }
+
+ foo->s = pinctrl_lookup_state(foo->p, PINCTRL_STATE_DEFAULT);
+ if (IS_ERR(foo->s)) {
+ /* FIXME: clean up "foo" here */
+ return PTR_ERR(foo->s);
+ }
+
+ ret = pinctrl_select_state(foo->p, foo->s);
+ if (ret < 0) {
+ /* FIXME: clean up "foo" here */
+ return ret;
+ }
+ }
+
+This get/lookup/select/put sequence can just as well be handled by bus drivers
+if you don't want each and every driver to handle it and you know the
+arrangement on your bus.
+
+The semantics of the pinctrl APIs are:
+
+- ``pinctrl_get()`` is called in process context to obtain a handle to all pinctrl
+ information for a given client device. It will allocate a struct from the
+ kernel memory to hold the pinmux state. All mapping table parsing or similar
+ slow operations take place within this API.
+
+- ``devm_pinctrl_get()`` is a variant of pinctrl_get() that causes ``pinctrl_put()``
+ to be called automatically on the retrieved pointer when the associated
+ device is removed. It is recommended to use this function over plain
+ ``pinctrl_get()``.
+
+- ``pinctrl_lookup_state()`` is called in process context to obtain a handle to a
+ specific state for a client device. This operation may be slow, too.
+
+- ``pinctrl_select_state()`` programs pin controller hardware according to the
+ definition of the state as given by the mapping table. In theory, this is a
+ fast-path operation, since it only involved blasting some register settings
+ into hardware. However, note that some pin controllers may have their
+ registers on a slow/IRQ-based bus, so client devices should not assume they
+ can call ``pinctrl_select_state()`` from non-blocking contexts.
+
+- ``pinctrl_put()`` frees all information associated with a pinctrl handle.
+
+- ``devm_pinctrl_put()`` is a variant of ``pinctrl_put()`` that may be used to
+ explicitly destroy a pinctrl object returned by ``devm_pinctrl_get()``.
+ However, use of this function will be rare, due to the automatic cleanup
+ that will occur even without calling it.
+
+ ``pinctrl_get()`` must be paired with a plain ``pinctrl_put()``.
+ ``pinctrl_get()`` may not be paired with ``devm_pinctrl_put()``.
+ ``devm_pinctrl_get()`` can optionally be paired with ``devm_pinctrl_put()``.
+ ``devm_pinctrl_get()`` may not be paired with plain ``pinctrl_put()``.
+
+Usually the pin control core handled the get/put pair and call out to the
+device drivers bookkeeping operations, like checking available functions and
+the associated pins, whereas ``pinctrl_select_state()`` pass on to the pin controller
+driver which takes care of activating and/or deactivating the mux setting by
+quickly poking some registers.
+
+The pins are allocated for your device when you issue the ``devm_pinctrl_get()``
+call, after this you should be able to see this in the debugfs listing of all
+pins.
+
+NOTE: the pinctrl system will return ``-EPROBE_DEFER`` if it cannot find the
+requested pinctrl handles, for example if the pinctrl driver has not yet
+registered. Thus make sure that the error path in your driver gracefully
+cleans up and is ready to retry the probing later in the startup process.
+
+
+Drivers needing both pin control and GPIOs
+==========================================
+
+Again, it is discouraged to let drivers lookup and select pin control states
+themselves, but again sometimes this is unavoidable.
+
+So say that your driver is fetching its resources like this:
+
+.. code-block:: c
+
+ #include <linux/pinctrl/consumer.h>
+ #include <linux/gpio/consumer.h>
+
+ struct pinctrl *pinctrl;
+ struct gpio_desc *gpio;
+
+ pinctrl = devm_pinctrl_get_select_default(&dev);
+ gpio = devm_gpiod_get(&dev, "foo");
+
+Here we first request a certain pin state and then request GPIO "foo" to be
+used. If you're using the subsystems orthogonally like this, you should
+nominally always get your pinctrl handle and select the desired pinctrl
+state BEFORE requesting the GPIO. This is a semantic convention to avoid
+situations that can be electrically unpleasant, you will certainly want to
+mux in and bias pins in a certain way before the GPIO subsystems starts to
+deal with them.
+
+The above can be hidden: using the device core, the pinctrl core may be
+setting up the config and muxing for the pins right before the device is
+probing, nevertheless orthogonal to the GPIO subsystem.
+
+But there are also situations where it makes sense for the GPIO subsystem
+to communicate directly with the pinctrl subsystem, using the latter as a
+back-end. This is when the GPIO driver may call out to the functions
+described in the section `Pin control interaction with the GPIO subsystem`_
+above. This only involves per-pin multiplexing, and will be completely
+hidden behind the gpiod_*() function namespace. In this case, the driver
+need not interact with the pin control subsystem at all.
+
+If a pin control driver and a GPIO driver is dealing with the same pins
+and the use cases involve multiplexing, you MUST implement the pin controller
+as a back-end for the GPIO driver like this, unless your hardware design
+is such that the GPIO controller can override the pin controller's
+multiplexing state through hardware without the need to interact with the
+pin control system.
+
+
+System pin control hogging
+==========================
+
+Pin control map entries can be hogged by the core when the pin controller
+is registered. This means that the core will attempt to call ``pinctrl_get()``,
+``pinctrl_lookup_state()`` and ``pinctrl_select_state()`` on it immediately after
+the pin control device has been registered.
+
+This occurs for mapping table entries where the client device name is equal
+to the pin controller device name, and the state name is ``PINCTRL_STATE_DEFAULT``:
+
+.. code-block:: c
+
+ {
+ .dev_name = "pinctrl-foo",
+ .name = PINCTRL_STATE_DEFAULT,
+ .type = PIN_MAP_TYPE_MUX_GROUP,
+ .ctrl_dev_name = "pinctrl-foo",
+ .function = "power_func",
+ },
+
+Since it may be common to request the core to hog a few always-applicable
+mux settings on the primary pin controller, there is a convenience macro for
+this:
+
+.. code-block:: c
+
+ PIN_MAP_MUX_GROUP_HOG_DEFAULT("pinctrl-foo", NULL /* group */,
+ "power_func")
+
+This gives the exact same result as the above construction.
+
+
+Runtime pinmuxing
+=================
+
+It is possible to mux a certain function in and out at runtime, say to move
+an SPI port from one set of pins to another set of pins. Say for example for
+spi0 in the example above, we expose two different groups of pins for the same
+function, but with different named in the mapping as described under
+"Advanced mapping" above. So that for an SPI device, we have two states named
+"pos-A" and "pos-B".
+
+This snippet first initializes a state object for both groups (in foo_probe()),
+then muxes the function in the pins defined by group A, and finally muxes it in
+on the pins defined by group B:
+
+.. code-block:: c
+
+ #include <linux/pinctrl/consumer.h>
+
+ struct pinctrl *p;
+ struct pinctrl_state *s1, *s2;
+
+ foo_probe()
+ {
+ /* Setup */
+ p = devm_pinctrl_get(&device);
+ if (IS_ERR(p))
+ ...
+
+ s1 = pinctrl_lookup_state(p, "pos-A");
+ if (IS_ERR(s1))
+ ...
+
+ s2 = pinctrl_lookup_state(p, "pos-B");
+ if (IS_ERR(s2))
+ ...
+ }
+
+ foo_switch()
+ {
+ /* Enable on position A */
+ ret = pinctrl_select_state(p, s1);
+ if (ret < 0)
+ ...
+
+ ...
+
+ /* Enable on position B */
+ ret = pinctrl_select_state(p, s2);
+ if (ret < 0)
+ ...
+
+ ...
+ }
+
+The above has to be done from process context. The reservation of the pins
+will be done when the state is activated, so in effect one specific pin
+can be used by different functions at different times on a running system.
+
+
+Debugfs files
+=============
+
+These files are created in ``/sys/kernel/debug/pinctrl``:
+
+- ``pinctrl-devices``: prints each pin controller device along with columns to
+ indicate support for pinmux and pinconf
+
+- ``pinctrl-handles``: prints each configured pin controller handle and the
+ corresponding pinmux maps
+
+- ``pinctrl-maps``: prints all pinctrl maps
+
+A sub-directory is created inside of ``/sys/kernel/debug/pinctrl`` for each pin
+controller device containing these files:
+
+- ``pins``: prints a line for each pin registered on the pin controller. The
+ pinctrl driver may add additional information such as register contents.
+
+- ``gpio-ranges``: prints ranges that map gpio lines to pins on the controller
+
+- ``pingroups``: prints all pin groups registered on the pin controller
+
+- ``pinconf-pins``: prints pin config settings for each pin
+
+- ``pinconf-groups``: prints pin config settings per pin group
+
+- ``pinmux-functions``: prints each pin function along with the pin groups that
+ map to the pin function
+
+- ``pinmux-pins``: iterates through all pins and prints mux owner, gpio owner
+ and if the pin is a hog
+
+- ``pinmux-select``: write to this file to activate a pin function for a group:
+
+ .. code-block:: sh
+
+ echo "<group-name function-name>" > pinmux-select
diff --git a/Documentation/driver-api/pldmfw/driver-ops.rst b/Documentation/driver-api/pldmfw/driver-ops.rst
new file mode 100644
index 0000000000..f0654783d3
--- /dev/null
+++ b/Documentation/driver-api/pldmfw/driver-ops.rst
@@ -0,0 +1,56 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+=========================
+Driver-specific callbacks
+=========================
+
+The ``pldmfw`` module relies on the device driver for implementing device
+specific behavior using the following operations.
+
+``.match_record``
+-----------------
+
+The ``.match_record`` operation is used to determine whether a given PLDM
+record matches the device being updated. This requires comparing the record
+descriptors in the record with information from the device. Many record
+descriptors are defined by the PLDM standard, but it is also allowed for
+devices to implement their own descriptors.
+
+The ``.match_record`` operation should return true if a given record matches
+the device.
+
+``.send_package_data``
+----------------------
+
+The ``.send_package_data`` operation is used to send the device-specific
+package data in a record to the device firmware. If the matching record
+provides package data, ``pldmfw`` will call the ``.send_package_data``
+function with a pointer to the package data and with the package data
+length. The device driver should send this data to firmware.
+
+``.send_component_table``
+-------------------------
+
+The ``.send_component_table`` operation is used to forward component
+information to the device. It is called once for each applicable component,
+that is, for each component indicated by the matching record. The
+device driver should send the component information to the device firmware,
+and wait for a response. The provided transfer flag indicates whether this
+is the first, last, or a middle component, and is expected to be forwarded
+to firmware as part of the component table information. The driver should an
+error in the case when the firmware indicates that the component cannot be
+updated, or return zero if the component can be updated.
+
+``.flash_component``
+--------------------
+
+The ``.flash_component`` operation is used to inform the device driver to
+flash a given component. The driver must perform any steps necessary to send
+the component data to the device.
+
+``.finalize_update``
+--------------------
+
+The ``.finalize_update`` operation is used by the ``pldmfw`` library in
+order to allow the device driver to perform any remaining device specific
+logic needed to finish the update.
diff --git a/Documentation/driver-api/pldmfw/file-format.rst b/Documentation/driver-api/pldmfw/file-format.rst
new file mode 100644
index 0000000000..b7a9cebe09
--- /dev/null
+++ b/Documentation/driver-api/pldmfw/file-format.rst
@@ -0,0 +1,203 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+==================================
+PLDM Firmware file format overview
+==================================
+
+A PLDM firmware package is a binary file which contains a header that
+describes the contents of the firmware package. This includes an initial
+package header, one or more firmware records, and one or more components
+describing the actual flash contents to program.
+
+This diagram provides an overview of the file format::
+
+ overall file layout
+ +----------------------+
+ | |
+ | Package Header |
+ | |
+ +----------------------+
+ | |
+ | Device Records |
+ | |
+ +----------------------+
+ | |
+ | Component Info |
+ | |
+ +----------------------+
+ | |
+ | Package Header CRC |
+ | |
+ +----------------------+
+ | |
+ | Component Image 1 |
+ | |
+ +----------------------+
+ | |
+ | Component Image 2 |
+ | |
+ +----------------------+
+ | |
+ | ... |
+ | |
+ +----------------------+
+ | |
+ | Component Image N |
+ | |
+ +----------------------+
+
+Package Header
+==============
+
+The package header begins with the UUID of the PLDM file format, and
+contains information about the version of the format that the file uses. It
+also includes the total header size, a release date, the size of the
+component bitmap, and an overall package version.
+
+The following diagram provides an overview of the package header::
+
+ header layout
+ +-------------------------+
+ | PLDM UUID |
+ +-------------------------+
+ | Format Revision |
+ +-------------------------+
+ | Header Size |
+ +-------------------------+
+ | Release Date |
+ +-------------------------+
+ | Component Bitmap Length |
+ +-------------------------+
+ | Package Version Info |
+ +-------------------------+
+
+Device Records
+==============
+
+The device firmware records area starts with a count indicating the total
+number of records in the file, followed by each record. A single device
+record describes what device matches this record. All valid PLDM firmware
+files must contain at least one record, but optionally may contain more than
+one record if they support multiple devices.
+
+Each record will identify the device it supports via TLVs that describe the
+device, such as the PCI device and vendor information. It will also indicate
+which set of components that are used by this device. It is possible that
+only subset of provided components will be used by a given record. A record
+may also optionally contain device-specific package data that will be used
+by the device firmware during the update process.
+
+The following diagram provides an overview of the device record area::
+
+ area layout
+ +---------------+
+ | |
+ | Record Count |
+ | |
+ +---------------+
+ | |
+ | Record 1 |
+ | |
+ +---------------+
+ | |
+ | Record 2 |
+ | |
+ +---------------+
+ | |
+ | ... |
+ | |
+ +---------------+
+ | |
+ | Record N |
+ | |
+ +---------------+
+
+ record layout
+ +-----------------------+
+ | Record Length |
+ +-----------------------+
+ | Descriptor Count |
+ +-----------------------+
+ | Option Flags |
+ +-----------------------+
+ | Version Settings |
+ +-----------------------+
+ | Package Data Length |
+ +-----------------------+
+ | Applicable Components |
+ +-----------------------+
+ | Version String |
+ +-----------------------+
+ | Descriptor TLVs |
+ +-----------------------+
+ | Package Data |
+ +-----------------------+
+
+Component Info
+==============
+
+The component information area begins with a count of the number of
+components. Following this count is a description for each component. The
+component information points to the location in the file where the component
+data is stored, and includes version data used to identify the version of
+the component.
+
+The following diagram provides an overview of the component area::
+
+ area layout
+ +-----------------+
+ | |
+ | Component Count |
+ | |
+ +-----------------+
+ | |
+ | Component 1 |
+ | |
+ +-----------------+
+ | |
+ | Component 2 |
+ | |
+ +-----------------+
+ | |
+ | ... |
+ | |
+ +-----------------+
+ | |
+ | Component N |
+ | |
+ +-----------------+
+
+ component layout
+ +------------------------+
+ | Classification |
+ +------------------------+
+ | Component Identifier |
+ +------------------------+
+ | Comparison Stamp |
+ +------------------------+
+ | Component Options |
+ +------------------------+
+ | Activation Method |
+ +------------------------+
+ | Location Offset |
+ +------------------------+
+ | Component Size |
+ +------------------------+
+ | Component Version Info |
+ +------------------------+
+ | Package Data |
+ +------------------------+
+
+
+Package Header CRC
+==================
+
+Following the component information is a short 4-byte CRC calculated over
+the contents of all of the header information.
+
+Component Images
+================
+
+The component images follow the package header information in the PLDM
+firmware file. Each of these is simply a binary chunk with its start and
+size defined by the matching component structure in the component info area.
diff --git a/Documentation/driver-api/pldmfw/index.rst b/Documentation/driver-api/pldmfw/index.rst
new file mode 100644
index 0000000000..fd871b83f3
--- /dev/null
+++ b/Documentation/driver-api/pldmfw/index.rst
@@ -0,0 +1,72 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+==================================
+PLDM Firmware Flash Update Library
+==================================
+
+``pldmfw`` implements functionality for updating the flash on a device using
+the PLDM for Firmware Update standard
+<https://www.dmtf.org/documents/pmci/pldm-firmware-update-specification-100>.
+
+.. toctree::
+ :maxdepth: 1
+
+ file-format
+ driver-ops
+
+==================================
+Overview of the ``pldmfw`` library
+==================================
+
+The ``pldmfw`` library is intended to be used by device drivers for
+implementing device flash update based on firmware files following the PLDM
+firmware file format.
+
+It is implemented using an ops table that allows device drivers to provide
+the underlying device specific functionality.
+
+``pldmfw`` implements logic to parse the packed binary format of the PLDM
+firmware file into data structures, and then uses the provided function
+operations to determine if the firmware file is a match for the device. If
+so, it sends the record and component data to the firmware using the device
+specific implementations provided by device drivers. Once the device
+firmware indicates that the update may be performed, the firmware data is
+sent to the device for programming.
+
+Parsing the PLDM file
+=====================
+
+The PLDM file format uses packed binary data, with most multi-byte fields
+stored in the Little Endian format. Several pieces of data are variable
+length, including version strings and the number of records and components.
+Due to this, it is not straight forward to index the record, record
+descriptors, or components.
+
+To avoid proliferating access to the packed binary data, the ``pldmfw``
+library parses and extracts this data into simpler structures for ease of
+access.
+
+In order to safely process the firmware file, care is taken to avoid
+unaligned access of multi-byte fields, and to properly convert from Little
+Endian to CPU host format. Additionally the records, descriptors, and
+components are stored in linked lists.
+
+Performing a flash update
+=========================
+
+To perform a flash update, the ``pldmfw`` module performs the following
+steps
+
+1. Parse the firmware file for record and component information
+2. Scan through the records and determine if the device matches any record
+ in the file. The first matched record will be used.
+3. If the matching record provides package data, send this package data to
+ the device.
+4. For each component that the record indicates, send the component data to
+ the device. For each component, the firmware may respond with an
+ indication of whether the update is suitable or not. If any component is
+ not suitable, the update is canceled.
+5. For each component, send the binary data to the device firmware for
+ updating.
+6. After all components are programmed, perform any final device-specific
+ actions to finalize the update.
diff --git a/Documentation/driver-api/pm/cpuidle.rst b/Documentation/driver-api/pm/cpuidle.rst
new file mode 100644
index 0000000000..d477208604
--- /dev/null
+++ b/Documentation/driver-api/pm/cpuidle.rst
@@ -0,0 +1,279 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. include:: <isonum.txt>
+
+========================
+CPU Idle Time Management
+========================
+
+:Copyright: |copy| 2019 Intel Corporation
+
+:Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+
+
+CPU Idle Time Management Subsystem
+==================================
+
+Every time one of the logical CPUs in the system (the entities that appear to
+fetch and execute instructions: hardware threads, if present, or processor
+cores) is idle after an interrupt or equivalent wakeup event, which means that
+there are no tasks to run on it except for the special "idle" task associated
+with it, there is an opportunity to save energy for the processor that it
+belongs to. That can be done by making the idle logical CPU stop fetching
+instructions from memory and putting some of the processor's functional units
+depended on by it into an idle state in which they will draw less power.
+
+However, there may be multiple different idle states that can be used in such a
+situation in principle, so it may be necessary to find the most suitable one
+(from the kernel perspective) and ask the processor to use (or "enter") that
+particular idle state. That is the role of the CPU idle time management
+subsystem in the kernel, called ``CPUIdle``.
+
+The design of ``CPUIdle`` is modular and based on the code duplication avoidance
+principle, so the generic code that in principle need not depend on the hardware
+or platform design details in it is separate from the code that interacts with
+the hardware. It generally is divided into three categories of functional
+units: *governors* responsible for selecting idle states to ask the processor
+to enter, *drivers* that pass the governors' decisions on to the hardware and
+the *core* providing a common framework for them.
+
+
+CPU Idle Time Governors
+=======================
+
+A CPU idle time (``CPUIdle``) governor is a bundle of policy code invoked when
+one of the logical CPUs in the system turns out to be idle. Its role is to
+select an idle state to ask the processor to enter in order to save some energy.
+
+``CPUIdle`` governors are generic and each of them can be used on any hardware
+platform that the Linux kernel can run on. For this reason, data structures
+operated on by them cannot depend on any hardware architecture or platform
+design details as well.
+
+The governor itself is represented by a struct cpuidle_governor object
+containing four callback pointers, :c:member:`enable`, :c:member:`disable`,
+:c:member:`select`, :c:member:`reflect`, a :c:member:`rating` field described
+below, and a name (string) used for identifying it.
+
+For the governor to be available at all, that object needs to be registered
+with the ``CPUIdle`` core by calling :c:func:`cpuidle_register_governor()` with
+a pointer to it passed as the argument. If successful, that causes the core to
+add the governor to the global list of available governors and, if it is the
+only one in the list (that is, the list was empty before) or the value of its
+:c:member:`rating` field is greater than the value of that field for the
+governor currently in use, or the name of the new governor was passed to the
+kernel as the value of the ``cpuidle.governor=`` command line parameter, the new
+governor will be used from that point on (there can be only one ``CPUIdle``
+governor in use at a time). Also, user space can choose the ``CPUIdle``
+governor to use at run time via ``sysfs``.
+
+Once registered, ``CPUIdle`` governors cannot be unregistered, so it is not
+practical to put them into loadable kernel modules.
+
+The interface between ``CPUIdle`` governors and the core consists of four
+callbacks:
+
+:c:member:`enable`
+ ::
+
+ int (*enable) (struct cpuidle_driver *drv, struct cpuidle_device *dev);
+
+ The role of this callback is to prepare the governor for handling the
+ (logical) CPU represented by the struct cpuidle_device object pointed
+ to by the ``dev`` argument. The struct cpuidle_driver object pointed
+ to by the ``drv`` argument represents the ``CPUIdle`` driver to be used
+ with that CPU (among other things, it should contain the list of
+ struct cpuidle_state objects representing idle states that the
+ processor holding the given CPU can be asked to enter).
+
+ It may fail, in which case it is expected to return a negative error
+ code, and that causes the kernel to run the architecture-specific
+ default code for idle CPUs on the CPU in question instead of ``CPUIdle``
+ until the ``->enable()`` governor callback is invoked for that CPU
+ again.
+
+:c:member:`disable`
+ ::
+
+ void (*disable) (struct cpuidle_driver *drv, struct cpuidle_device *dev);
+
+ Called to make the governor stop handling the (logical) CPU represented
+ by the struct cpuidle_device object pointed to by the ``dev``
+ argument.
+
+ It is expected to reverse any changes made by the ``->enable()``
+ callback when it was last invoked for the target CPU, free all memory
+ allocated by that callback and so on.
+
+:c:member:`select`
+ ::
+
+ int (*select) (struct cpuidle_driver *drv, struct cpuidle_device *dev,
+ bool *stop_tick);
+
+ Called to select an idle state for the processor holding the (logical)
+ CPU represented by the struct cpuidle_device object pointed to by the
+ ``dev`` argument.
+
+ The list of idle states to take into consideration is represented by the
+ :c:member:`states` array of struct cpuidle_state objects held by the
+ struct cpuidle_driver object pointed to by the ``drv`` argument (which
+ represents the ``CPUIdle`` driver to be used with the CPU at hand). The
+ value returned by this callback is interpreted as an index into that
+ array (unless it is a negative error code).
+
+ The ``stop_tick`` argument is used to indicate whether or not to stop
+ the scheduler tick before asking the processor to enter the selected
+ idle state. When the ``bool`` variable pointed to by it (which is set
+ to ``true`` before invoking this callback) is cleared to ``false``, the
+ processor will be asked to enter the selected idle state without
+ stopping the scheduler tick on the given CPU (if the tick has been
+ stopped on that CPU already, however, it will not be restarted before
+ asking the processor to enter the idle state).
+
+ This callback is mandatory (i.e. the :c:member:`select` callback pointer
+ in struct cpuidle_governor must not be ``NULL`` for the registration
+ of the governor to succeed).
+
+:c:member:`reflect`
+ ::
+
+ void (*reflect) (struct cpuidle_device *dev, int index);
+
+ Called to allow the governor to evaluate the accuracy of the idle state
+ selection made by the ``->select()`` callback (when it was invoked last
+ time) and possibly use the result of that to improve the accuracy of
+ idle state selections in the future.
+
+In addition, ``CPUIdle`` governors are required to take power management
+quality of service (PM QoS) constraints on the processor wakeup latency into
+account when selecting idle states. In order to obtain the current effective
+PM QoS wakeup latency constraint for a given CPU, a ``CPUIdle`` governor is
+expected to pass the number of the CPU to
+:c:func:`cpuidle_governor_latency_req()`. Then, the governor's ``->select()``
+callback must not return the index of an indle state whose
+:c:member:`exit_latency` value is greater than the number returned by that
+function.
+
+
+CPU Idle Time Management Drivers
+================================
+
+CPU idle time management (``CPUIdle``) drivers provide an interface between the
+other parts of ``CPUIdle`` and the hardware.
+
+First of all, a ``CPUIdle`` driver has to populate the :c:member:`states` array
+of struct cpuidle_state objects included in the struct cpuidle_driver object
+representing it. Going forward this array will represent the list of available
+idle states that the processor hardware can be asked to enter shared by all of
+the logical CPUs handled by the given driver.
+
+The entries in the :c:member:`states` array are expected to be sorted by the
+value of the :c:member:`target_residency` field in struct cpuidle_state in
+the ascending order (that is, index 0 should correspond to the idle state with
+the minimum value of :c:member:`target_residency`). [Since the
+:c:member:`target_residency` value is expected to reflect the "depth" of the
+idle state represented by the struct cpuidle_state object holding it, this
+sorting order should be the same as the ascending sorting order by the idle
+state "depth".]
+
+Three fields in struct cpuidle_state are used by the existing ``CPUIdle``
+governors for computations related to idle state selection:
+
+:c:member:`target_residency`
+ Minimum time to spend in this idle state including the time needed to
+ enter it (which may be substantial) to save more energy than could
+ be saved by staying in a shallower idle state for the same amount of
+ time, in microseconds.
+
+:c:member:`exit_latency`
+ Maximum time it will take a CPU asking the processor to enter this idle
+ state to start executing the first instruction after a wakeup from it,
+ in microseconds.
+
+:c:member:`flags`
+ Flags representing idle state properties. Currently, governors only use
+ the ``CPUIDLE_FLAG_POLLING`` flag which is set if the given object
+ does not represent a real idle state, but an interface to a software
+ "loop" that can be used in order to avoid asking the processor to enter
+ any idle state at all. [There are other flags used by the ``CPUIdle``
+ core in special situations.]
+
+The :c:member:`enter` callback pointer in struct cpuidle_state, which must not
+be ``NULL``, points to the routine to execute in order to ask the processor to
+enter this particular idle state:
+
+::
+
+ void (*enter) (struct cpuidle_device *dev, struct cpuidle_driver *drv,
+ int index);
+
+The first two arguments of it point to the struct cpuidle_device object
+representing the logical CPU running this callback and the
+struct cpuidle_driver object representing the driver itself, respectively,
+and the last one is an index of the struct cpuidle_state entry in the driver's
+:c:member:`states` array representing the idle state to ask the processor to
+enter.
+
+The analogous ``->enter_s2idle()`` callback in struct cpuidle_state is used
+only for implementing the suspend-to-idle system-wide power management feature.
+The difference between in and ``->enter()`` is that it must not re-enable
+interrupts at any point (even temporarily) or attempt to change the states of
+clock event devices, which the ``->enter()`` callback may do sometimes.
+
+Once the :c:member:`states` array has been populated, the number of valid
+entries in it has to be stored in the :c:member:`state_count` field of the
+struct cpuidle_driver object representing the driver. Moreover, if any
+entries in the :c:member:`states` array represent "coupled" idle states (that
+is, idle states that can only be asked for if multiple related logical CPUs are
+idle), the :c:member:`safe_state_index` field in struct cpuidle_driver needs
+to be the index of an idle state that is not "coupled" (that is, one that can be
+asked for if only one logical CPU is idle).
+
+In addition to that, if the given ``CPUIdle`` driver is only going to handle a
+subset of logical CPUs in the system, the :c:member:`cpumask` field in its
+struct cpuidle_driver object must point to the set (mask) of CPUs that will be
+handled by it.
+
+A ``CPUIdle`` driver can only be used after it has been registered. If there
+are no "coupled" idle state entries in the driver's :c:member:`states` array,
+that can be accomplished by passing the driver's struct cpuidle_driver object
+to :c:func:`cpuidle_register_driver()`. Otherwise, :c:func:`cpuidle_register()`
+should be used for this purpose.
+
+However, it also is necessary to register struct cpuidle_device objects for
+all of the logical CPUs to be handled by the given ``CPUIdle`` driver with the
+help of :c:func:`cpuidle_register_device()` after the driver has been registered
+and :c:func:`cpuidle_register_driver()`, unlike :c:func:`cpuidle_register()`,
+does not do that automatically. For this reason, the drivers that use
+:c:func:`cpuidle_register_driver()` to register themselves must also take care
+of registering the struct cpuidle_device objects as needed, so it is generally
+recommended to use :c:func:`cpuidle_register()` for ``CPUIdle`` driver
+registration in all cases.
+
+The registration of a struct cpuidle_device object causes the ``CPUIdle``
+``sysfs`` interface to be created and the governor's ``->enable()`` callback to
+be invoked for the logical CPU represented by it, so it must take place after
+registering the driver that will handle the CPU in question.
+
+``CPUIdle`` drivers and struct cpuidle_device objects can be unregistered
+when they are not necessary any more which allows some resources associated with
+them to be released. Due to dependencies between them, all of the
+struct cpuidle_device objects representing CPUs handled by the given
+``CPUIdle`` driver must be unregistered, with the help of
+:c:func:`cpuidle_unregister_device()`, before calling
+:c:func:`cpuidle_unregister_driver()` to unregister the driver. Alternatively,
+:c:func:`cpuidle_unregister()` can be called to unregister a ``CPUIdle`` driver
+along with all of the struct cpuidle_device objects representing CPUs handled
+by it.
+
+``CPUIdle`` drivers can respond to runtime system configuration changes that
+lead to modifications of the list of available processor idle states (which can
+happen, for example, when the system's power source is switched from AC to
+battery or the other way around). Upon a notification of such a change,
+a ``CPUIdle`` driver is expected to call :c:func:`cpuidle_pause_and_lock()` to
+turn ``CPUIdle`` off temporarily and then :c:func:`cpuidle_disable_device()` for
+all of the struct cpuidle_device objects representing CPUs affected by that
+change. Next, it can update its :c:member:`states` array in accordance with
+the new configuration of the system, call :c:func:`cpuidle_enable_device()` for
+all of the relevant struct cpuidle_device objects and invoke
+:c:func:`cpuidle_resume_and_unlock()` to allow ``CPUIdle`` to be used again.
diff --git a/Documentation/driver-api/pm/devices.rst b/Documentation/driver-api/pm/devices.rst
new file mode 100644
index 0000000000..d448cb57df
--- /dev/null
+++ b/Documentation/driver-api/pm/devices.rst
@@ -0,0 +1,880 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. include:: <isonum.txt>
+
+.. _driverapi_pm_devices:
+
+==============================
+Device Power Management Basics
+==============================
+
+:Copyright: |copy| 2010-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
+:Copyright: |copy| 2010 Alan Stern <stern@rowland.harvard.edu>
+:Copyright: |copy| 2016 Intel Corporation
+
+:Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+
+
+Most of the code in Linux is device drivers, so most of the Linux power
+management (PM) code is also driver-specific. Most drivers will do very
+little; others, especially for platforms with small batteries (like cell
+phones), will do a lot.
+
+This writeup gives an overview of how drivers interact with system-wide
+power management goals, emphasizing the models and interfaces that are
+shared by everything that hooks up to the driver model core. Read it as
+background for the domain-specific work you'd do with any specific driver.
+
+
+Two Models for Device Power Management
+======================================
+
+Drivers will use one or both of these models to put devices into low-power
+states:
+
+ System Sleep model:
+
+ Drivers can enter low-power states as part of entering system-wide
+ low-power states like "suspend" (also known as "suspend-to-RAM"), or
+ (mostly for systems with disks) "hibernation" (also known as
+ "suspend-to-disk").
+
+ This is something that device, bus, and class drivers collaborate on
+ by implementing various role-specific suspend and resume methods to
+ cleanly power down hardware and software subsystems, then reactivate
+ them without loss of data.
+
+ Some drivers can manage hardware wakeup events, which make the system
+ leave the low-power state. This feature may be enabled or disabled
+ using the relevant :file:`/sys/devices/.../power/wakeup` file (for
+ Ethernet drivers the ioctl interface used by ethtool may also be used
+ for this purpose); enabling it may cost some power usage, but let the
+ whole system enter low-power states more often.
+
+ Runtime Power Management model:
+
+ Devices may also be put into low-power states while the system is
+ running, independently of other power management activity in principle.
+ However, devices are not generally independent of each other (for
+ example, a parent device cannot be suspended unless all of its child
+ devices have been suspended). Moreover, depending on the bus type the
+ device is on, it may be necessary to carry out some bus-specific
+ operations on the device for this purpose. Devices put into low power
+ states at run time may require special handling during system-wide power
+ transitions (suspend or hibernation).
+
+ For these reasons not only the device driver itself, but also the
+ appropriate subsystem (bus type, device type or device class) driver and
+ the PM core are involved in runtime power management. As in the system
+ sleep power management case, they need to collaborate by implementing
+ various role-specific suspend and resume methods, so that the hardware
+ is cleanly powered down and reactivated without data or service loss.
+
+There's not a lot to be said about those low-power states except that they are
+very system-specific, and often device-specific. Also, that if enough devices
+have been put into low-power states (at runtime), the effect may be very similar
+to entering some system-wide low-power state (system sleep) ... and that
+synergies exist, so that several drivers using runtime PM might put the system
+into a state where even deeper power saving options are available.
+
+Most suspended devices will have quiesced all I/O: no more DMA or IRQs (except
+for wakeup events), no more data read or written, and requests from upstream
+drivers are no longer accepted. A given bus or platform may have different
+requirements though.
+
+Examples of hardware wakeup events include an alarm from a real time clock,
+network wake-on-LAN packets, keyboard or mouse activity, and media insertion
+or removal (for PCMCIA, MMC/SD, USB, and so on).
+
+Interfaces for Entering System Sleep States
+===========================================
+
+There are programming interfaces provided for subsystems (bus type, device type,
+device class) and device drivers to allow them to participate in the power
+management of devices they are concerned with. These interfaces cover both
+system sleep and runtime power management.
+
+
+Device Power Management Operations
+----------------------------------
+
+Device power management operations, at the subsystem level as well as at the
+device driver level, are implemented by defining and populating objects of type
+struct dev_pm_ops defined in :file:`include/linux/pm.h`. The roles of the
+methods included in it will be explained in what follows. For now, it should be
+sufficient to remember that the last three methods are specific to runtime power
+management while the remaining ones are used during system-wide power
+transitions.
+
+There also is a deprecated "old" or "legacy" interface for power management
+operations available at least for some subsystems. This approach does not use
+struct dev_pm_ops objects and it is suitable only for implementing system
+sleep power management methods in a limited way. Therefore it is not described
+in this document, so please refer directly to the source code for more
+information about it.
+
+
+Subsystem-Level Methods
+-----------------------
+
+The core methods to suspend and resume devices reside in
+struct dev_pm_ops pointed to by the :c:member:`ops` member of
+struct dev_pm_domain, or by the :c:member:`pm` member of struct bus_type,
+struct device_type and struct class. They are mostly of interest to the
+people writing infrastructure for platforms and buses, like PCI or USB, or
+device type and device class drivers. They also are relevant to the writers of
+device drivers whose subsystems (PM domains, device types, device classes and
+bus types) don't provide all power management methods.
+
+Bus drivers implement these methods as appropriate for the hardware and the
+drivers using it; PCI works differently from USB, and so on. Not many people
+write subsystem-level drivers; most driver code is a "device driver" that builds
+on top of bus-specific framework code.
+
+For more information on these driver calls, see the description later;
+they are called in phases for every device, respecting the parent-child
+sequencing in the driver model tree.
+
+
+:file:`/sys/devices/.../power/wakeup` files
+-------------------------------------------
+
+All device objects in the driver model contain fields that control the handling
+of system wakeup events (hardware signals that can force the system out of a
+sleep state). These fields are initialized by bus or device driver code using
+:c:func:`device_set_wakeup_capable()` and :c:func:`device_set_wakeup_enable()`,
+defined in :file:`include/linux/pm_wakeup.h`.
+
+The :c:member:`power.can_wakeup` flag just records whether the device (and its
+driver) can physically support wakeup events. The
+:c:func:`device_set_wakeup_capable()` routine affects this flag. The
+:c:member:`power.wakeup` field is a pointer to an object of type
+struct wakeup_source used for controlling whether or not the device should use
+its system wakeup mechanism and for notifying the PM core of system wakeup
+events signaled by the device. This object is only present for wakeup-capable
+devices (i.e. devices whose :c:member:`can_wakeup` flags are set) and is created
+(or removed) by :c:func:`device_set_wakeup_capable()`.
+
+Whether or not a device is capable of issuing wakeup events is a hardware
+matter, and the kernel is responsible for keeping track of it. By contrast,
+whether or not a wakeup-capable device should issue wakeup events is a policy
+decision, and it is managed by user space through a sysfs attribute: the
+:file:`power/wakeup` file. User space can write the "enabled" or "disabled"
+strings to it to indicate whether or not, respectively, the device is supposed
+to signal system wakeup. This file is only present if the
+:c:member:`power.wakeup` object exists for the given device and is created (or
+removed) along with that object, by :c:func:`device_set_wakeup_capable()`.
+Reads from the file will return the corresponding string.
+
+The initial value in the :file:`power/wakeup` file is "disabled" for the
+majority of devices; the major exceptions are power buttons, keyboards, and
+Ethernet adapters whose WoL (wake-on-LAN) feature has been set up with ethtool.
+It should also default to "enabled" for devices that don't generate wakeup
+requests on their own but merely forward wakeup requests from one bus to another
+(like PCI Express ports).
+
+The :c:func:`device_may_wakeup()` routine returns true only if the
+:c:member:`power.wakeup` object exists and the corresponding :file:`power/wakeup`
+file contains the "enabled" string. This information is used by subsystems,
+like the PCI bus type code, to see whether or not to enable the devices' wakeup
+mechanisms. If device wakeup mechanisms are enabled or disabled directly by
+drivers, they also should use :c:func:`device_may_wakeup()` to decide what to do
+during a system sleep transition. Device drivers, however, are not expected to
+call :c:func:`device_set_wakeup_enable()` directly in any case.
+
+It ought to be noted that system wakeup is conceptually different from "remote
+wakeup" used by runtime power management, although it may be supported by the
+same physical mechanism. Remote wakeup is a feature allowing devices in
+low-power states to trigger specific interrupts to signal conditions in which
+they should be put into the full-power state. Those interrupts may or may not
+be used to signal system wakeup events, depending on the hardware design. On
+some systems it is impossible to trigger them from system sleep states. In any
+case, remote wakeup should always be enabled for runtime power management for
+all devices and drivers that support it.
+
+
+:file:`/sys/devices/.../power/control` files
+--------------------------------------------
+
+Each device in the driver model has a flag to control whether it is subject to
+runtime power management. This flag, :c:member:`runtime_auto`, is initialized
+by the bus type (or generally subsystem) code using :c:func:`pm_runtime_allow()`
+or :c:func:`pm_runtime_forbid()`; the default is to allow runtime power
+management.
+
+The setting can be adjusted by user space by writing either "on" or "auto" to
+the device's :file:`power/control` sysfs file. Writing "auto" calls
+:c:func:`pm_runtime_allow()`, setting the flag and allowing the device to be
+runtime power-managed by its driver. Writing "on" calls
+:c:func:`pm_runtime_forbid()`, clearing the flag, returning the device to full
+power if it was in a low-power state, and preventing the
+device from being runtime power-managed. User space can check the current value
+of the :c:member:`runtime_auto` flag by reading that file.
+
+The device's :c:member:`runtime_auto` flag has no effect on the handling of
+system-wide power transitions. In particular, the device can (and in the
+majority of cases should and will) be put into a low-power state during a
+system-wide transition to a sleep state even though its :c:member:`runtime_auto`
+flag is clear.
+
+For more information about the runtime power management framework, refer to
+Documentation/power/runtime_pm.rst.
+
+
+Calling Drivers to Enter and Leave System Sleep States
+======================================================
+
+When the system goes into a sleep state, each device's driver is asked to
+suspend the device by putting it into a state compatible with the target
+system state. That's usually some version of "off", but the details are
+system-specific. Also, wakeup-enabled devices will usually stay partly
+functional in order to wake the system.
+
+When the system leaves that low-power state, the device's driver is asked to
+resume it by returning it to full power. The suspend and resume operations
+always go together, and both are multi-phase operations.
+
+For simple drivers, suspend might quiesce the device using class code
+and then turn its hardware as "off" as possible during suspend_noirq. The
+matching resume calls would then completely reinitialize the hardware
+before reactivating its class I/O queues.
+
+More power-aware drivers might prepare the devices for triggering system wakeup
+events.
+
+
+Call Sequence Guarantees
+------------------------
+
+To ensure that bridges and similar links needing to talk to a device are
+available when the device is suspended or resumed, the device hierarchy is
+walked in a bottom-up order to suspend devices. A top-down order is
+used to resume those devices.
+
+The ordering of the device hierarchy is defined by the order in which devices
+get registered: a child can never be registered, probed or resumed before
+its parent; and can't be removed or suspended after that parent.
+
+The policy is that the device hierarchy should match hardware bus topology.
+[Or at least the control bus, for devices which use multiple busses.]
+In particular, this means that a device registration may fail if the parent of
+the device is suspending (i.e. has been chosen by the PM core as the next
+device to suspend) or has already suspended, as well as after all of the other
+devices have been suspended. Device drivers must be prepared to cope with such
+situations.
+
+
+System Power Management Phases
+------------------------------
+
+Suspending or resuming the system is done in several phases. Different phases
+are used for suspend-to-idle, shallow (standby), and deep ("suspend-to-RAM")
+sleep states and the hibernation state ("suspend-to-disk"). Each phase involves
+executing callbacks for every device before the next phase begins. Not all
+buses or classes support all these callbacks and not all drivers use all the
+callbacks. The various phases always run after tasks have been frozen and
+before they are unfrozen. Furthermore, the ``*_noirq`` phases run at a time
+when IRQ handlers have been disabled (except for those marked with the
+IRQF_NO_SUSPEND flag).
+
+All phases use PM domain, bus, type, class or driver callbacks (that is, methods
+defined in ``dev->pm_domain->ops``, ``dev->bus->pm``, ``dev->type->pm``,
+``dev->class->pm`` or ``dev->driver->pm``). These callbacks are regarded by the
+PM core as mutually exclusive. Moreover, PM domain callbacks always take
+precedence over all of the other callbacks and, for example, type callbacks take
+precedence over bus, class and driver callbacks. To be precise, the following
+rules are used to determine which callback to execute in the given phase:
+
+ 1. If ``dev->pm_domain`` is present, the PM core will choose the callback
+ provided by ``dev->pm_domain->ops`` for execution.
+
+ 2. Otherwise, if both ``dev->type`` and ``dev->type->pm`` are present, the
+ callback provided by ``dev->type->pm`` will be chosen for execution.
+
+ 3. Otherwise, if both ``dev->class`` and ``dev->class->pm`` are present,
+ the callback provided by ``dev->class->pm`` will be chosen for
+ execution.
+
+ 4. Otherwise, if both ``dev->bus`` and ``dev->bus->pm`` are present, the
+ callback provided by ``dev->bus->pm`` will be chosen for execution.
+
+This allows PM domains and device types to override callbacks provided by bus
+types or device classes if necessary.
+
+The PM domain, type, class and bus callbacks may in turn invoke device- or
+driver-specific methods stored in ``dev->driver->pm``, but they don't have to do
+that.
+
+If the subsystem callback chosen for execution is not present, the PM core will
+execute the corresponding method from the ``dev->driver->pm`` set instead if
+there is one.
+
+
+Entering System Suspend
+-----------------------
+
+When the system goes into the freeze, standby or memory sleep state,
+the phases are: ``prepare``, ``suspend``, ``suspend_late``, ``suspend_noirq``.
+
+ 1. The ``prepare`` phase is meant to prevent races by preventing new
+ devices from being registered; the PM core would never know that all the
+ children of a device had been suspended if new children could be
+ registered at will. [By contrast, from the PM core's perspective,
+ devices may be unregistered at any time.] Unlike the other
+ suspend-related phases, during the ``prepare`` phase the device
+ hierarchy is traversed top-down.
+
+ After the ``->prepare`` callback method returns, no new children may be
+ registered below the device. The method may also prepare the device or
+ driver in some way for the upcoming system power transition, but it
+ should not put the device into a low-power state. Moreover, if the
+ device supports runtime power management, the ``->prepare`` callback
+ method must not update its state in case it is necessary to resume it
+ from runtime suspend later on.
+
+ For devices supporting runtime power management, the return value of the
+ prepare callback can be used to indicate to the PM core that it may
+ safely leave the device in runtime suspend (if runtime-suspended
+ already), provided that all of the device's descendants are also left in
+ runtime suspend. Namely, if the prepare callback returns a positive
+ number and that happens for all of the descendants of the device too,
+ and all of them (including the device itself) are runtime-suspended, the
+ PM core will skip the ``suspend``, ``suspend_late`` and
+ ``suspend_noirq`` phases as well as all of the corresponding phases of
+ the subsequent device resume for all of these devices. In that case,
+ the ``->complete`` callback will be the next one invoked after the
+ ``->prepare`` callback and is entirely responsible for putting the
+ device into a consistent state as appropriate.
+
+ Note that this direct-complete procedure applies even if the device is
+ disabled for runtime PM; only the runtime-PM status matters. It follows
+ that if a device has system-sleep callbacks but does not support runtime
+ PM, then its prepare callback must never return a positive value. This
+ is because all such devices are initially set to runtime-suspended with
+ runtime PM disabled.
+
+ This feature also can be controlled by device drivers by using the
+ ``DPM_FLAG_NO_DIRECT_COMPLETE`` and ``DPM_FLAG_SMART_PREPARE`` driver
+ power management flags. [Typically, they are set at the time the driver
+ is probed against the device in question by passing them to the
+ :c:func:`dev_pm_set_driver_flags` helper function.] If the first of
+ these flags is set, the PM core will not apply the direct-complete
+ procedure described above to the given device and, consequenty, to any
+ of its ancestors. The second flag, when set, informs the middle layer
+ code (bus types, device types, PM domains, classes) that it should take
+ the return value of the ``->prepare`` callback provided by the driver
+ into account and it may only return a positive value from its own
+ ``->prepare`` callback if the driver's one also has returned a positive
+ value.
+
+ 2. The ``->suspend`` methods should quiesce the device to stop it from
+ performing I/O. They also may save the device registers and put it into
+ the appropriate low-power state, depending on the bus type the device is
+ on, and they may enable wakeup events.
+
+ However, for devices supporting runtime power management, the
+ ``->suspend`` methods provided by subsystems (bus types and PM domains
+ in particular) must follow an additional rule regarding what can be done
+ to the devices before their drivers' ``->suspend`` methods are called.
+ Namely, they may resume the devices from runtime suspend by
+ calling :c:func:`pm_runtime_resume` for them, if that is necessary, but
+ they must not update the state of the devices in any other way at that
+ time (in case the drivers need to resume the devices from runtime
+ suspend in their ``->suspend`` methods). In fact, the PM core prevents
+ subsystems or drivers from putting devices into runtime suspend at
+ these times by calling :c:func:`pm_runtime_get_noresume` before issuing
+ the ``->prepare`` callback (and calling :c:func:`pm_runtime_put` after
+ issuing the ``->complete`` callback).
+
+ 3. For a number of devices it is convenient to split suspend into the
+ "quiesce device" and "save device state" phases, in which cases
+ ``suspend_late`` is meant to do the latter. It is always executed after
+ runtime power management has been disabled for the device in question.
+
+ 4. The ``suspend_noirq`` phase occurs after IRQ handlers have been disabled,
+ which means that the driver's interrupt handler will not be called while
+ the callback method is running. The ``->suspend_noirq`` methods should
+ save the values of the device's registers that weren't saved previously
+ and finally put the device into the appropriate low-power state.
+
+ The majority of subsystems and device drivers need not implement this
+ callback. However, bus types allowing devices to share interrupt
+ vectors, like PCI, generally need it; otherwise a driver might encounter
+ an error during the suspend phase by fielding a shared interrupt
+ generated by some other device after its own device had been set to low
+ power.
+
+At the end of these phases, drivers should have stopped all I/O transactions
+(DMA, IRQs), saved enough state that they can re-initialize or restore previous
+state (as needed by the hardware), and placed the device into a low-power state.
+On many platforms they will gate off one or more clock sources; sometimes they
+will also switch off power supplies or reduce voltages. [Drivers supporting
+runtime PM may already have performed some or all of these steps.]
+
+If :c:func:`device_may_wakeup()` returns ``true``, the device should be
+prepared for generating hardware wakeup signals to trigger a system wakeup event
+when the system is in the sleep state. For example, :c:func:`enable_irq_wake()`
+might identify GPIO signals hooked up to a switch or other external hardware,
+and :c:func:`pci_enable_wake()` does something similar for the PCI PME signal.
+
+If any of these callbacks returns an error, the system won't enter the desired
+low-power state. Instead, the PM core will unwind its actions by resuming all
+the devices that were suspended.
+
+
+Leaving System Suspend
+----------------------
+
+When resuming from freeze, standby or memory sleep, the phases are:
+``resume_noirq``, ``resume_early``, ``resume``, ``complete``.
+
+ 1. The ``->resume_noirq`` callback methods should perform any actions
+ needed before the driver's interrupt handlers are invoked. This
+ generally means undoing the actions of the ``suspend_noirq`` phase. If
+ the bus type permits devices to share interrupt vectors, like PCI, the
+ method should bring the device and its driver into a state in which the
+ driver can recognize if the device is the source of incoming interrupts,
+ if any, and handle them correctly.
+
+ For example, the PCI bus type's ``->pm.resume_noirq()`` puts the device
+ into the full-power state (D0 in the PCI terminology) and restores the
+ standard configuration registers of the device. Then it calls the
+ device driver's ``->pm.resume_noirq()`` method to perform device-specific
+ actions.
+
+ 2. The ``->resume_early`` methods should prepare devices for the execution
+ of the resume methods. This generally involves undoing the actions of
+ the preceding ``suspend_late`` phase.
+
+ 3. The ``->resume`` methods should bring the device back to its operating
+ state, so that it can perform normal I/O. This generally involves
+ undoing the actions of the ``suspend`` phase.
+
+ 4. The ``complete`` phase should undo the actions of the ``prepare`` phase.
+ For this reason, unlike the other resume-related phases, during the
+ ``complete`` phase the device hierarchy is traversed bottom-up.
+
+ Note, however, that new children may be registered below the device as
+ soon as the ``->resume`` callbacks occur; it's not necessary to wait
+ until the ``complete`` phase runs.
+
+ Moreover, if the preceding ``->prepare`` callback returned a positive
+ number, the device may have been left in runtime suspend throughout the
+ whole system suspend and resume (its ``->suspend``, ``->suspend_late``,
+ ``->suspend_noirq``, ``->resume_noirq``,
+ ``->resume_early``, and ``->resume`` callbacks may have been
+ skipped). In that case, the ``->complete`` callback is entirely
+ responsible for putting the device into a consistent state after system
+ suspend if necessary. [For example, it may need to queue up a runtime
+ resume request for the device for this purpose.] To check if that is
+ the case, the ``->complete`` callback can consult the device's
+ ``power.direct_complete`` flag. If that flag is set when the
+ ``->complete`` callback is being run then the direct-complete mechanism
+ was used, and special actions may be required to make the device work
+ correctly afterward.
+
+At the end of these phases, drivers should be as functional as they were before
+suspending: I/O can be performed using DMA and IRQs, and the relevant clocks are
+gated on.
+
+However, the details here may again be platform-specific. For example,
+some systems support multiple "run" states, and the mode in effect at
+the end of resume might not be the one which preceded suspension.
+That means availability of certain clocks or power supplies changed,
+which could easily affect how a driver works.
+
+Drivers need to be able to handle hardware which has been reset since all of the
+suspend methods were called, for example by complete reinitialization.
+This may be the hardest part, and the one most protected by NDA'd documents
+and chip errata. It's simplest if the hardware state hasn't changed since
+the suspend was carried out, but that can only be guaranteed if the target
+system sleep entered was suspend-to-idle. For the other system sleep states
+that may not be the case (and usually isn't for ACPI-defined system sleep
+states, like S3).
+
+Drivers must also be prepared to notice that the device has been removed
+while the system was powered down, whenever that's physically possible.
+PCMCIA, MMC, USB, Firewire, SCSI, and even IDE are common examples of busses
+where common Linux platforms will see such removal. Details of how drivers
+will notice and handle such removals are currently bus-specific, and often
+involve a separate thread.
+
+These callbacks may return an error value, but the PM core will ignore such
+errors since there's nothing it can do about them other than printing them in
+the system log.
+
+
+Entering Hibernation
+--------------------
+
+Hibernating the system is more complicated than putting it into sleep states,
+because it involves creating and saving a system image. Therefore there are
+more phases for hibernation, with a different set of callbacks. These phases
+always run after tasks have been frozen and enough memory has been freed.
+
+The general procedure for hibernation is to quiesce all devices ("freeze"),
+create an image of the system memory while everything is stable, reactivate all
+devices ("thaw"), write the image to permanent storage, and finally shut down
+the system ("power off"). The phases used to accomplish this are: ``prepare``,
+``freeze``, ``freeze_late``, ``freeze_noirq``, ``thaw_noirq``, ``thaw_early``,
+``thaw``, ``complete``, ``prepare``, ``poweroff``, ``poweroff_late``,
+``poweroff_noirq``.
+
+ 1. The ``prepare`` phase is discussed in the "Entering System Suspend"
+ section above.
+
+ 2. The ``->freeze`` methods should quiesce the device so that it doesn't
+ generate IRQs or DMA, and they may need to save the values of device
+ registers. However the device does not have to be put in a low-power
+ state, and to save time it's best not to do so. Also, the device should
+ not be prepared to generate wakeup events.
+
+ 3. The ``freeze_late`` phase is analogous to the ``suspend_late`` phase
+ described earlier, except that the device should not be put into a
+ low-power state and should not be allowed to generate wakeup events.
+
+ 4. The ``freeze_noirq`` phase is analogous to the ``suspend_noirq`` phase
+ discussed earlier, except again that the device should not be put into
+ a low-power state and should not be allowed to generate wakeup events.
+
+At this point the system image is created. All devices should be inactive and
+the contents of memory should remain undisturbed while this happens, so that the
+image forms an atomic snapshot of the system state.
+
+ 5. The ``thaw_noirq`` phase is analogous to the ``resume_noirq`` phase
+ discussed earlier. The main difference is that its methods can assume
+ the device is in the same state as at the end of the ``freeze_noirq``
+ phase.
+
+ 6. The ``thaw_early`` phase is analogous to the ``resume_early`` phase
+ described above. Its methods should undo the actions of the preceding
+ ``freeze_late``, if necessary.
+
+ 7. The ``thaw`` phase is analogous to the ``resume`` phase discussed
+ earlier. Its methods should bring the device back to an operating
+ state, so that it can be used for saving the image if necessary.
+
+ 8. The ``complete`` phase is discussed in the "Leaving System Suspend"
+ section above.
+
+At this point the system image is saved, and the devices then need to be
+prepared for the upcoming system shutdown. This is much like suspending them
+before putting the system into the suspend-to-idle, shallow or deep sleep state,
+and the phases are similar.
+
+ 9. The ``prepare`` phase is discussed above.
+
+ 10. The ``poweroff`` phase is analogous to the ``suspend`` phase.
+
+ 11. The ``poweroff_late`` phase is analogous to the ``suspend_late`` phase.
+
+ 12. The ``poweroff_noirq`` phase is analogous to the ``suspend_noirq`` phase.
+
+The ``->poweroff``, ``->poweroff_late`` and ``->poweroff_noirq`` callbacks
+should do essentially the same things as the ``->suspend``, ``->suspend_late``
+and ``->suspend_noirq`` callbacks, respectively. A notable difference is
+that they need not store the device register values, because the registers
+should already have been stored during the ``freeze``, ``freeze_late`` or
+``freeze_noirq`` phases. Also, on many machines the firmware will power-down
+the entire system, so it is not necessary for the callback to put the device in
+a low-power state.
+
+
+Leaving Hibernation
+-------------------
+
+Resuming from hibernation is, again, more complicated than resuming from a sleep
+state in which the contents of main memory are preserved, because it requires
+a system image to be loaded into memory and the pre-hibernation memory contents
+to be restored before control can be passed back to the image kernel.
+
+Although in principle the image might be loaded into memory and the
+pre-hibernation memory contents restored by the boot loader, in practice this
+can't be done because boot loaders aren't smart enough and there is no
+established protocol for passing the necessary information. So instead, the
+boot loader loads a fresh instance of the kernel, called "the restore kernel",
+into memory and passes control to it in the usual way. Then the restore kernel
+reads the system image, restores the pre-hibernation memory contents, and passes
+control to the image kernel. Thus two different kernel instances are involved
+in resuming from hibernation. In fact, the restore kernel may be completely
+different from the image kernel: a different configuration and even a different
+version. This has important consequences for device drivers and their
+subsystems.
+
+To be able to load the system image into memory, the restore kernel needs to
+include at least a subset of device drivers allowing it to access the storage
+medium containing the image, although it doesn't need to include all of the
+drivers present in the image kernel. After the image has been loaded, the
+devices managed by the boot kernel need to be prepared for passing control back
+to the image kernel. This is very similar to the initial steps involved in
+creating a system image, and it is accomplished in the same way, using
+``prepare``, ``freeze``, and ``freeze_noirq`` phases. However, the devices
+affected by these phases are only those having drivers in the restore kernel;
+other devices will still be in whatever state the boot loader left them.
+
+Should the restoration of the pre-hibernation memory contents fail, the restore
+kernel would go through the "thawing" procedure described above, using the
+``thaw_noirq``, ``thaw_early``, ``thaw``, and ``complete`` phases, and then
+continue running normally. This happens only rarely. Most often the
+pre-hibernation memory contents are restored successfully and control is passed
+to the image kernel, which then becomes responsible for bringing the system back
+to the working state.
+
+To achieve this, the image kernel must restore the devices' pre-hibernation
+functionality. The operation is much like waking up from a sleep state (with
+the memory contents preserved), although it involves different phases:
+``restore_noirq``, ``restore_early``, ``restore``, ``complete``.
+
+ 1. The ``restore_noirq`` phase is analogous to the ``resume_noirq`` phase.
+
+ 2. The ``restore_early`` phase is analogous to the ``resume_early`` phase.
+
+ 3. The ``restore`` phase is analogous to the ``resume`` phase.
+
+ 4. The ``complete`` phase is discussed above.
+
+The main difference from ``resume[_early|_noirq]`` is that
+``restore[_early|_noirq]`` must assume the device has been accessed and
+reconfigured by the boot loader or the restore kernel. Consequently, the state
+of the device may be different from the state remembered from the ``freeze``,
+``freeze_late`` and ``freeze_noirq`` phases. The device may even need to be
+reset and completely re-initialized. In many cases this difference doesn't
+matter, so the ``->resume[_early|_noirq]`` and ``->restore[_early|_norq]``
+method pointers can be set to the same routines. Nevertheless, different
+callback pointers are used in case there is a situation where it actually does
+matter.
+
+
+Power Management Notifiers
+==========================
+
+There are some operations that cannot be carried out by the power management
+callbacks discussed above, because the callbacks occur too late or too early.
+To handle these cases, subsystems and device drivers may register power
+management notifiers that are called before tasks are frozen and after they have
+been thawed. Generally speaking, the PM notifiers are suitable for performing
+actions that either require user space to be available, or at least won't
+interfere with user space.
+
+For details refer to Documentation/driver-api/pm/notifiers.rst.
+
+
+Device Low-Power (suspend) States
+=================================
+
+Device low-power states aren't standard. One device might only handle
+"on" and "off", while another might support a dozen different versions of
+"on" (how many engines are active?), plus a state that gets back to "on"
+faster than from a full "off".
+
+Some buses define rules about what different suspend states mean. PCI
+gives one example: after the suspend sequence completes, a non-legacy
+PCI device may not perform DMA or issue IRQs, and any wakeup events it
+issues would be issued through the PME# bus signal. Plus, there are
+several PCI-standard device states, some of which are optional.
+
+In contrast, integrated system-on-chip processors often use IRQs as the
+wakeup event sources (so drivers would call :c:func:`enable_irq_wake`) and
+might be able to treat DMA completion as a wakeup event (sometimes DMA can stay
+active too, it'd only be the CPU and some peripherals that sleep).
+
+Some details here may be platform-specific. Systems may have devices that
+can be fully active in certain sleep states, such as an LCD display that's
+refreshed using DMA while most of the system is sleeping lightly ... and
+its frame buffer might even be updated by a DSP or other non-Linux CPU while
+the Linux control processor stays idle.
+
+Moreover, the specific actions taken may depend on the target system state.
+One target system state might allow a given device to be very operational;
+another might require a hard shut down with re-initialization on resume.
+And two different target systems might use the same device in different
+ways; the aforementioned LCD might be active in one product's "standby",
+but a different product using the same SOC might work differently.
+
+
+Device Power Management Domains
+===============================
+
+Sometimes devices share reference clocks or other power resources. In those
+cases it generally is not possible to put devices into low-power states
+individually. Instead, a set of devices sharing a power resource can be put
+into a low-power state together at the same time by turning off the shared
+power resource. Of course, they also need to be put into the full-power state
+together, by turning the shared power resource on. A set of devices with this
+property is often referred to as a power domain. A power domain may also be
+nested inside another power domain. The nested domain is referred to as the
+sub-domain of the parent domain.
+
+Support for power domains is provided through the :c:member:`pm_domain` field of
+struct device. This field is a pointer to an object of type
+struct dev_pm_domain, defined in :file:`include/linux/pm.h`, providing a set
+of power management callbacks analogous to the subsystem-level and device driver
+callbacks that are executed for the given device during all power transitions,
+instead of the respective subsystem-level callbacks. Specifically, if a
+device's :c:member:`pm_domain` pointer is not NULL, the ``->suspend()`` callback
+from the object pointed to by it will be executed instead of its subsystem's
+(e.g. bus type's) ``->suspend()`` callback and analogously for all of the
+remaining callbacks. In other words, power management domain callbacks, if
+defined for the given device, always take precedence over the callbacks provided
+by the device's subsystem (e.g. bus type).
+
+The support for device power management domains is only relevant to platforms
+needing to use the same device driver power management callbacks in many
+different power domain configurations and wanting to avoid incorporating the
+support for power domains into subsystem-level callbacks, for example by
+modifying the platform bus type. Other platforms need not implement it or take
+it into account in any way.
+
+Devices may be defined as IRQ-safe which indicates to the PM core that their
+runtime PM callbacks may be invoked with disabled interrupts (see
+Documentation/power/runtime_pm.rst for more information). If an
+IRQ-safe device belongs to a PM domain, the runtime PM of the domain will be
+disallowed, unless the domain itself is defined as IRQ-safe. However, it
+makes sense to define a PM domain as IRQ-safe only if all the devices in it
+are IRQ-safe. Moreover, if an IRQ-safe domain has a parent domain, the runtime
+PM of the parent is only allowed if the parent itself is IRQ-safe too with the
+additional restriction that all child domains of an IRQ-safe parent must also
+be IRQ-safe.
+
+
+Runtime Power Management
+========================
+
+Many devices are able to dynamically power down while the system is still
+running. This feature is useful for devices that are not being used, and
+can offer significant power savings on a running system. These devices
+often support a range of runtime power states, which might use names such
+as "off", "sleep", "idle", "active", and so on. Those states will in some
+cases (like PCI) be partially constrained by the bus the device uses, and will
+usually include hardware states that are also used in system sleep states.
+
+A system-wide power transition can be started while some devices are in low
+power states due to runtime power management. The system sleep PM callbacks
+should recognize such situations and react to them appropriately, but the
+necessary actions are subsystem-specific.
+
+In some cases the decision may be made at the subsystem level while in other
+cases the device driver may be left to decide. In some cases it may be
+desirable to leave a suspended device in that state during a system-wide power
+transition, but in other cases the device must be put back into the full-power
+state temporarily, for example so that its system wakeup capability can be
+disabled. This all depends on the hardware and the design of the subsystem and
+device driver in question.
+
+If it is necessary to resume a device from runtime suspend during a system-wide
+transition into a sleep state, that can be done by calling
+:c:func:`pm_runtime_resume` from the ``->suspend`` callback (or the ``->freeze``
+or ``->poweroff`` callback for transitions related to hibernation) of either the
+device's driver or its subsystem (for example, a bus type or a PM domain).
+However, subsystems must not otherwise change the runtime status of devices
+from their ``->prepare`` and ``->suspend`` callbacks (or equivalent) *before*
+invoking device drivers' ``->suspend`` callbacks (or equivalent).
+
+.. _smart_suspend_flag:
+
+The ``DPM_FLAG_SMART_SUSPEND`` Driver Flag
+------------------------------------------
+
+Some bus types and PM domains have a policy to resume all devices from runtime
+suspend upfront in their ``->suspend`` callbacks, but that may not be really
+necessary if the device's driver can cope with runtime-suspended devices.
+The driver can indicate this by setting ``DPM_FLAG_SMART_SUSPEND`` in
+:c:member:`power.driver_flags` at probe time, with the assistance of the
+:c:func:`dev_pm_set_driver_flags` helper routine.
+
+Setting that flag causes the PM core and middle-layer code
+(bus types, PM domains etc.) to skip the ``->suspend_late`` and
+``->suspend_noirq`` callbacks provided by the driver if the device remains in
+runtime suspend throughout those phases of the system-wide suspend (and
+similarly for the "freeze" and "poweroff" parts of system hibernation).
+[Otherwise the same driver
+callback might be executed twice in a row for the same device, which would not
+be valid in general.] If the middle-layer system-wide PM callbacks are present
+for the device then they are responsible for skipping these driver callbacks;
+if not then the PM core skips them. The subsystem callback routines can
+determine whether they need to skip the driver callbacks by testing the return
+value from the :c:func:`dev_pm_skip_suspend` helper function.
+
+In addition, with ``DPM_FLAG_SMART_SUSPEND`` set, the driver's ``->thaw_noirq``
+and ``->thaw_early`` callbacks are skipped in hibernation if the device remained
+in runtime suspend throughout the preceding "freeze" transition. Again, if the
+middle-layer callbacks are present for the device, they are responsible for
+doing this, otherwise the PM core takes care of it.
+
+
+The ``DPM_FLAG_MAY_SKIP_RESUME`` Driver Flag
+--------------------------------------------
+
+During system-wide resume from a sleep state it's easiest to put devices into
+the full-power state, as explained in Documentation/power/runtime_pm.rst.
+[Refer to that document for more information regarding this particular issue as
+well as for information on the device runtime power management framework in
+general.] However, it often is desirable to leave devices in suspend after
+system transitions to the working state, especially if those devices had been in
+runtime suspend before the preceding system-wide suspend (or analogous)
+transition.
+
+To that end, device drivers can use the ``DPM_FLAG_MAY_SKIP_RESUME`` flag to
+indicate to the PM core and middle-layer code that they allow their "noirq" and
+"early" resume callbacks to be skipped if the device can be left in suspend
+after system-wide PM transitions to the working state. Whether or not that is
+the case generally depends on the state of the device before the given system
+suspend-resume cycle and on the type of the system transition under way.
+In particular, the "thaw" and "restore" transitions related to hibernation are
+not affected by ``DPM_FLAG_MAY_SKIP_RESUME`` at all. [All callbacks are
+issued during the "restore" transition regardless of the flag settings,
+and whether or not any driver callbacks
+are skipped during the "thaw" transition depends whether or not the
+``DPM_FLAG_SMART_SUSPEND`` flag is set (see `above <smart_suspend_flag_>`_).
+In addition, a device is not allowed to remain in runtime suspend if any of its
+children will be returned to full power.]
+
+The ``DPM_FLAG_MAY_SKIP_RESUME`` flag is taken into account in combination with
+the :c:member:`power.may_skip_resume` status bit set by the PM core during the
+"suspend" phase of suspend-type transitions. If the driver or the middle layer
+has a reason to prevent the driver's "noirq" and "early" resume callbacks from
+being skipped during the subsequent system resume transition, it should
+clear :c:member:`power.may_skip_resume` in its ``->suspend``, ``->suspend_late``
+or ``->suspend_noirq`` callback. [Note that the drivers setting
+``DPM_FLAG_SMART_SUSPEND`` need to clear :c:member:`power.may_skip_resume` in
+their ``->suspend`` callback in case the other two are skipped.]
+
+Setting the :c:member:`power.may_skip_resume` status bit along with the
+``DPM_FLAG_MAY_SKIP_RESUME`` flag is necessary, but generally not sufficient,
+for the driver's "noirq" and "early" resume callbacks to be skipped. Whether or
+not they should be skipped can be determined by evaluating the
+:c:func:`dev_pm_skip_resume` helper function.
+
+If that function returns ``true``, the driver's "noirq" and "early" resume
+callbacks should be skipped and the device's runtime PM status will be set to
+"suspended" by the PM core. Otherwise, if the device was runtime-suspended
+during the preceding system-wide suspend transition and its
+``DPM_FLAG_SMART_SUSPEND`` is set, its runtime PM status will be set to
+"active" by the PM core. [Hence, the drivers that do not set
+``DPM_FLAG_SMART_SUSPEND`` should not expect the runtime PM status of their
+devices to be changed from "suspended" to "active" by the PM core during
+system-wide resume-type transitions.]
+
+If the ``DPM_FLAG_MAY_SKIP_RESUME`` flag is not set for a device, but
+``DPM_FLAG_SMART_SUSPEND`` is set and the driver's "late" and "noirq" suspend
+callbacks are skipped, its system-wide "noirq" and "early" resume callbacks, if
+present, are invoked as usual and the device's runtime PM status is set to
+"active" by the PM core before enabling runtime PM for it. In that case, the
+driver must be prepared to cope with the invocation of its system-wide resume
+callbacks back-to-back with its ``->runtime_suspend`` one (without the
+intervening ``->runtime_resume`` and system-wide suspend callbacks) and the
+final state of the device must reflect the "active" runtime PM status in that
+case. [Note that this is not a problem at all if the driver's
+``->suspend_late`` callback pointer points to the same function as its
+``->runtime_suspend`` one and its ``->resume_early`` callback pointer points to
+the same function as the ``->runtime_resume`` one, while none of the other
+system-wide suspend-resume callbacks of the driver are present, for example.]
+
+Likewise, if ``DPM_FLAG_MAY_SKIP_RESUME`` is set for a device, its driver's
+system-wide "noirq" and "early" resume callbacks may be skipped while its "late"
+and "noirq" suspend callbacks may have been executed (in principle, regardless
+of whether or not ``DPM_FLAG_SMART_SUSPEND`` is set). In that case, the driver
+needs to be able to cope with the invocation of its ``->runtime_resume``
+callback back-to-back with its "late" and "noirq" suspend ones. [For instance,
+that is not a concern if the driver sets both ``DPM_FLAG_SMART_SUSPEND`` and
+``DPM_FLAG_MAY_SKIP_RESUME`` and uses the same pair of suspend/resume callback
+functions for runtime PM and system-wide suspend/resume.]
diff --git a/Documentation/driver-api/pm/index.rst b/Documentation/driver-api/pm/index.rst
new file mode 100644
index 0000000000..c2a9ef8d11
--- /dev/null
+++ b/Documentation/driver-api/pm/index.rst
@@ -0,0 +1,19 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============================
+CPU and Device Power Management
+===============================
+
+.. toctree::
+
+ cpuidle
+ devices
+ notifiers
+ types
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/pm/notifiers.rst b/Documentation/driver-api/pm/notifiers.rst
new file mode 100644
index 0000000000..186435c43b
--- /dev/null
+++ b/Documentation/driver-api/pm/notifiers.rst
@@ -0,0 +1,74 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. include:: <isonum.txt>
+
+=============================
+Suspend/Hibernation Notifiers
+=============================
+
+:Copyright: |copy| 2016 Intel Corporation
+
+:Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+
+
+There are some operations that subsystems or drivers may want to carry out
+before hibernation/suspend or after restore/resume, but they require the system
+to be fully functional, so the drivers' and subsystems' ``->suspend()`` and
+``->resume()`` or even ``->prepare()`` and ``->complete()`` callbacks are not
+suitable for this purpose.
+
+For example, device drivers may want to upload firmware to their devices after
+resume/restore, but they cannot do it by calling :c:func:`request_firmware()`
+from their ``->resume()`` or ``->complete()`` callback routines (user land
+processes are frozen at these points). The solution may be to load the firmware
+into memory before processes are frozen and upload it from there in the
+``->resume()`` routine. A suspend/hibernation notifier may be used for that.
+
+Subsystems or drivers having such needs can register suspend notifiers that
+will be called upon the following events by the PM core:
+
+``PM_HIBERNATION_PREPARE``
+ The system is going to hibernate, tasks will be frozen immediately. This
+ is different from ``PM_SUSPEND_PREPARE`` below, because in this case
+ additional work is done between the notifiers and the invocation of PM
+ callbacks for the "freeze" transition.
+
+``PM_POST_HIBERNATION``
+ The system memory state has been restored from a hibernation image or an
+ error occurred during hibernation. Device restore callbacks have been
+ executed and tasks have been thawed.
+
+``PM_RESTORE_PREPARE``
+ The system is going to restore a hibernation image. If all goes well,
+ the restored image kernel will issue a ``PM_POST_HIBERNATION``
+ notification.
+
+``PM_POST_RESTORE``
+ An error occurred during restore from hibernation. Device restore
+ callbacks have been executed and tasks have been thawed.
+
+``PM_SUSPEND_PREPARE``
+ The system is preparing for suspend.
+
+``PM_POST_SUSPEND``
+ The system has just resumed or an error occurred during suspend. Device
+ resume callbacks have been executed and tasks have been thawed.
+
+It is generally assumed that whatever the notifiers do for
+``PM_HIBERNATION_PREPARE``, should be undone for ``PM_POST_HIBERNATION``.
+Analogously, operations carried out for ``PM_SUSPEND_PREPARE`` should be
+reversed for ``PM_POST_SUSPEND``.
+
+Moreover, if one of the notifiers fails for the ``PM_HIBERNATION_PREPARE`` or
+``PM_SUSPEND_PREPARE`` event, the notifiers that have already succeeded for that
+event will be called for ``PM_POST_HIBERNATION`` or ``PM_POST_SUSPEND``,
+respectively.
+
+The hibernation and suspend notifiers are called with :c:data:`pm_mutex` held.
+They are defined in the usual way, but their last argument is meaningless (it is
+always NULL).
+
+To register and/or unregister a suspend notifier use
+:c:func:`register_pm_notifier()` and :c:func:`unregister_pm_notifier()`,
+respectively (both defined in :file:`include/linux/suspend.h`). If you don't
+need to unregister the notifier, you can also use the :c:func:`pm_notifier()`
+macro defined in :file:`include/linux/suspend.h`.
diff --git a/Documentation/driver-api/pm/types.rst b/Documentation/driver-api/pm/types.rst
new file mode 100644
index 0000000000..73a231caf7
--- /dev/null
+++ b/Documentation/driver-api/pm/types.rst
@@ -0,0 +1,7 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==================================
+Device Power Management Data Types
+==================================
+
+.. kernel-doc:: include/linux/pm.h
diff --git a/Documentation/driver-api/pps.rst b/Documentation/driver-api/pps.rst
new file mode 100644
index 0000000000..2d6b99766e
--- /dev/null
+++ b/Documentation/driver-api/pps.rst
@@ -0,0 +1,242 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+======================
+PPS - Pulse Per Second
+======================
+
+Copyright (C) 2007 Rodolfo Giometti <giometti@enneenne.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+
+
+Overview
+--------
+
+LinuxPPS provides a programming interface (API) to define in the
+system several PPS sources.
+
+PPS means "pulse per second" and a PPS source is just a device which
+provides a high precision signal each second so that an application
+can use it to adjust system clock time.
+
+A PPS source can be connected to a serial port (usually to the Data
+Carrier Detect pin) or to a parallel port (ACK-pin) or to a special
+CPU's GPIOs (this is the common case in embedded systems) but in each
+case when a new pulse arrives the system must apply to it a timestamp
+and record it for userland.
+
+Common use is the combination of the NTPD as userland program, with a
+GPS receiver as PPS source, to obtain a wallclock-time with
+sub-millisecond synchronisation to UTC.
+
+
+RFC considerations
+------------------
+
+While implementing a PPS API as RFC 2783 defines and using an embedded
+CPU GPIO-Pin as physical link to the signal, I encountered a deeper
+problem:
+
+ At startup it needs a file descriptor as argument for the function
+ time_pps_create().
+
+This implies that the source has a /dev/... entry. This assumption is
+OK for the serial and parallel port, where you can do something
+useful besides(!) the gathering of timestamps as it is the central
+task for a PPS API. But this assumption does not work for a single
+purpose GPIO line. In this case even basic file-related functionality
+(like read() and write()) makes no sense at all and should not be a
+precondition for the use of a PPS API.
+
+The problem can be simply solved if you consider that a PPS source is
+not always connected with a GPS data source.
+
+So your programs should check if the GPS data source (the serial port
+for instance) is a PPS source too, and if not they should provide the
+possibility to open another device as PPS source.
+
+In LinuxPPS the PPS sources are simply char devices usually mapped
+into files /dev/pps0, /dev/pps1, etc.
+
+
+PPS with USB to serial devices
+------------------------------
+
+It is possible to grab the PPS from an USB to serial device. However,
+you should take into account the latencies and jitter introduced by
+the USB stack. Users have reported clock instability around +-1ms when
+synchronized with PPS through USB. With USB 2.0, jitter may decrease
+down to the order of 125 microseconds.
+
+This may be suitable for time server synchronization with NTP because
+of its undersampling and algorithms.
+
+If your device doesn't report PPS, you can check that the feature is
+supported by its driver. Most of the time, you only need to add a call
+to usb_serial_handle_dcd_change after checking the DCD status (see
+ch341 and pl2303 examples).
+
+
+Coding example
+--------------
+
+To register a PPS source into the kernel you should define a struct
+pps_source_info as follows::
+
+ static struct pps_source_info pps_ktimer_info = {
+ .name = "ktimer",
+ .path = "",
+ .mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
+ PPS_ECHOASSERT |
+ PPS_CANWAIT | PPS_TSFMT_TSPEC,
+ .echo = pps_ktimer_echo,
+ .owner = THIS_MODULE,
+ };
+
+and then calling the function pps_register_source() in your
+initialization routine as follows::
+
+ source = pps_register_source(&pps_ktimer_info,
+ PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
+
+The pps_register_source() prototype is::
+
+ int pps_register_source(struct pps_source_info *info, int default_params)
+
+where "info" is a pointer to a structure that describes a particular
+PPS source, "default_params" tells the system what the initial default
+parameters for the device should be (it is obvious that these parameters
+must be a subset of ones defined in the struct
+pps_source_info which describe the capabilities of the driver).
+
+Once you have registered a new PPS source into the system you can
+signal an assert event (for example in the interrupt handler routine)
+just using::
+
+ pps_event(source, &ts, PPS_CAPTUREASSERT, ptr)
+
+where "ts" is the event's timestamp.
+
+The same function may also run the defined echo function
+(pps_ktimer_echo(), passing to it the "ptr" pointer) if the user
+asked for that... etc..
+
+Please see the file drivers/pps/clients/pps-ktimer.c for example code.
+
+
+SYSFS support
+-------------
+
+If the SYSFS filesystem is enabled in the kernel it provides a new class::
+
+ $ ls /sys/class/pps/
+ pps0/ pps1/ pps2/
+
+Every directory is the ID of a PPS sources defined in the system and
+inside you find several files::
+
+ $ ls -F /sys/class/pps/pps0/
+ assert dev mode path subsystem@
+ clear echo name power/ uevent
+
+
+Inside each "assert" and "clear" file you can find the timestamp and a
+sequence number::
+
+ $ cat /sys/class/pps/pps0/assert
+ 1170026870.983207967#8
+
+Where before the "#" is the timestamp in seconds; after it is the
+sequence number. Other files are:
+
+ * echo: reports if the PPS source has an echo function or not;
+
+ * mode: reports available PPS functioning modes;
+
+ * name: reports the PPS source's name;
+
+ * path: reports the PPS source's device path, that is the device the
+ PPS source is connected to (if it exists).
+
+
+Testing the PPS support
+-----------------------
+
+In order to test the PPS support even without specific hardware you can use
+the pps-ktimer driver (see the client subsection in the PPS configuration menu)
+and the userland tools available in your distribution's pps-tools package,
+http://linuxpps.org , or https://github.com/redlab-i/pps-tools.
+
+Once you have enabled the compilation of pps-ktimer just modprobe it (if
+not statically compiled)::
+
+ # modprobe pps-ktimer
+
+and the run ppstest as follow::
+
+ $ ./ppstest /dev/pps1
+ trying PPS source "/dev/pps1"
+ found PPS source "/dev/pps1"
+ ok, found 1 source(s), now start fetching data...
+ source 0 - assert 1186592699.388832443, sequence: 364 - clear 0.000000000, sequence: 0
+ source 0 - assert 1186592700.388931295, sequence: 365 - clear 0.000000000, sequence: 0
+ source 0 - assert 1186592701.389032765, sequence: 366 - clear 0.000000000, sequence: 0
+
+Please note that to compile userland programs, you need the file timepps.h.
+This is available in the pps-tools repository mentioned above.
+
+
+Generators
+----------
+
+Sometimes one needs to be able not only to catch PPS signals but to produce
+them also. For example, running a distributed simulation, which requires
+computers' clock to be synchronized very tightly. One way to do this is to
+invent some complicated hardware solutions but it may be neither necessary
+nor affordable. The cheap way is to load a PPS generator on one of the
+computers (master) and PPS clients on others (slaves), and use very simple
+cables to deliver signals using parallel ports, for example.
+
+Parallel port cable pinout::
+
+ pin name master slave
+ 1 STROBE *------ *
+ 2 D0 * | *
+ 3 D1 * | *
+ 4 D2 * | *
+ 5 D3 * | *
+ 6 D4 * | *
+ 7 D5 * | *
+ 8 D6 * | *
+ 9 D7 * | *
+ 10 ACK * ------*
+ 11 BUSY * *
+ 12 PE * *
+ 13 SEL * *
+ 14 AUTOFD * *
+ 15 ERROR * *
+ 16 INIT * *
+ 17 SELIN * *
+ 18-25 GND *-----------*
+
+Please note that parallel port interrupt occurs only on high->low transition,
+so it is used for PPS assert edge. PPS clear edge can be determined only
+using polling in the interrupt handler which actually can be done way more
+precisely because interrupt handling delays can be quite big and random. So
+current parport PPS generator implementation (pps_gen_parport module) is
+geared towards using the clear edge for time synchronization.
+
+Clear edge polling is done with disabled interrupts so it's better to select
+delay between assert and clear edge as small as possible to reduce system
+latencies. But if it is too small slave won't be able to capture clear edge
+transition. The default of 30us should be good enough in most situations.
+The delay can be selected using 'delay' pps_gen_parport module parameter.
diff --git a/Documentation/driver-api/ptp.rst b/Documentation/driver-api/ptp.rst
new file mode 100644
index 0000000000..5e033c3b11
--- /dev/null
+++ b/Documentation/driver-api/ptp.rst
@@ -0,0 +1,137 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===========================================
+PTP hardware clock infrastructure for Linux
+===========================================
+
+ This patch set introduces support for IEEE 1588 PTP clocks in
+ Linux. Together with the SO_TIMESTAMPING socket options, this
+ presents a standardized method for developing PTP user space
+ programs, synchronizing Linux with external clocks, and using the
+ ancillary features of PTP hardware clocks.
+
+ A new class driver exports a kernel interface for specific clock
+ drivers and a user space interface. The infrastructure supports a
+ complete set of PTP hardware clock functionality.
+
+ + Basic clock operations
+ - Set time
+ - Get time
+ - Shift the clock by a given offset atomically
+ - Adjust clock frequency
+
+ + Ancillary clock features
+ - Time stamp external events
+ - Period output signals configurable from user space
+ - Low Pass Filter (LPF) access from user space
+ - Synchronization of the Linux system time via the PPS subsystem
+
+PTP hardware clock kernel API
+=============================
+
+ A PTP clock driver registers itself with the class driver. The
+ class driver handles all of the dealings with user space. The
+ author of a clock driver need only implement the details of
+ programming the clock hardware. The clock driver notifies the class
+ driver of asynchronous events (alarms and external time stamps) via
+ a simple message passing interface.
+
+ The class driver supports multiple PTP clock drivers. In normal use
+ cases, only one PTP clock is needed. However, for testing and
+ development, it can be useful to have more than one clock in a
+ single system, in order to allow performance comparisons.
+
+PTP hardware clock user space API
+=================================
+
+ The class driver also creates a character device for each
+ registered clock. User space can use an open file descriptor from
+ the character device as a POSIX clock id and may call
+ clock_gettime, clock_settime, and clock_adjtime. These calls
+ implement the basic clock operations.
+
+ User space programs may control the clock using standardized
+ ioctls. A program may query, enable, configure, and disable the
+ ancillary clock features. User space can receive time stamped
+ events via blocking read() and poll().
+
+Writing clock drivers
+=====================
+
+ Clock drivers include include/linux/ptp_clock_kernel.h and register
+ themselves by presenting a 'struct ptp_clock_info' to the
+ registration method. Clock drivers must implement all of the
+ functions in the interface. If a clock does not offer a particular
+ ancillary feature, then the driver should just return -EOPNOTSUPP
+ from those functions.
+
+ Drivers must ensure that all of the methods in interface are
+ reentrant. Since most hardware implementations treat the time value
+ as a 64 bit integer accessed as two 32 bit registers, drivers
+ should use spin_lock_irqsave/spin_unlock_irqrestore to protect
+ against concurrent access. This locking cannot be accomplished in
+ class driver, since the lock may also be needed by the clock
+ driver's interrupt service routine.
+
+PTP hardware clock requirements for '.adjphase'
+-----------------------------------------------
+
+ The 'struct ptp_clock_info' interface has a '.adjphase' function.
+ This function has a set of requirements from the PHC in order to be
+ implemented.
+
+ * The PHC implements a servo algorithm internally that is used to
+ correct the offset passed in the '.adjphase' call.
+ * When other PTP adjustment functions are called, the PHC servo
+ algorithm is disabled.
+
+ **NOTE:** '.adjphase' is not a simple time adjustment functionality
+ that 'jumps' the PHC clock time based on the provided offset. It
+ should correct the offset provided using an internal algorithm.
+
+Supported hardware
+==================
+
+ * Freescale eTSEC gianfar
+
+ - 2 Time stamp external triggers, programmable polarity (opt. interrupt)
+ - 2 Alarm registers (optional interrupt)
+ - 3 Periodic signals (optional interrupt)
+
+ * National DP83640
+
+ - 6 GPIOs programmable as inputs or outputs
+ - 6 GPIOs with dedicated functions (LED/JTAG/clock) can also be
+ used as general inputs or outputs
+ - GPIO inputs can time stamp external triggers
+ - GPIO outputs can produce periodic signals
+ - 1 interrupt pin
+
+ * Intel IXP465
+
+ - Auxiliary Slave/Master Mode Snapshot (optional interrupt)
+ - Target Time (optional interrupt)
+
+ * Renesas (IDT) ClockMatrix™
+
+ - Up to 4 independent PHC channels
+ - Integrated low pass filter (LPF), access via .adjPhase (compliant to ITU-T G.8273.2)
+ - Programmable output periodic signals
+ - Programmable inputs can time stamp external triggers
+ - Driver and/or hardware configuration through firmware (idtcm.bin)
+ - LPF settings (bandwidth, phase limiting, automatic holdover, physical layer assist (per ITU-T G.8273.2))
+ - Programmable output PTP clocks, any frequency up to 1GHz (to other PHY/MAC time stampers, refclk to ASSPs/SoCs/FPGAs)
+ - Lock to GNSS input, automatic switching between GNSS and user-space PHC control (optional)
+
+ * NVIDIA Mellanox
+
+ - GPIO
+ - Certain variants of ConnectX-6 Dx and later products support one
+ GPIO which can time stamp external triggers and one GPIO to produce
+ periodic signals.
+ - Certain variants of ConnectX-5 and older products support one GPIO,
+ configured to either time stamp external triggers or produce
+ periodic signals.
+ - PHC instances
+ - All ConnectX devices have a free-running counter
+ - ConnectX-6 Dx and later devices have a UTC format counter
diff --git a/Documentation/driver-api/pwm.rst b/Documentation/driver-api/pwm.rst
new file mode 100644
index 0000000000..3fdc95f7a1
--- /dev/null
+++ b/Documentation/driver-api/pwm.rst
@@ -0,0 +1,176 @@
+======================================
+Pulse Width Modulation (PWM) interface
+======================================
+
+This provides an overview about the Linux PWM interface
+
+PWMs are commonly used for controlling LEDs, fans or vibrators in
+cell phones. PWMs with a fixed purpose have no need implementing
+the Linux PWM API (although they could). However, PWMs are often
+found as discrete devices on SoCs which have no fixed purpose. It's
+up to the board designer to connect them to LEDs or fans. To provide
+this kind of flexibility the generic PWM API exists.
+
+Identifying PWMs
+----------------
+
+Users of the legacy PWM API use unique IDs to refer to PWM devices.
+
+Instead of referring to a PWM device via its unique ID, board setup code
+should instead register a static mapping that can be used to match PWM
+consumers to providers, as given in the following example::
+
+ static struct pwm_lookup board_pwm_lookup[] = {
+ PWM_LOOKUP("tegra-pwm", 0, "pwm-backlight", NULL,
+ 50000, PWM_POLARITY_NORMAL),
+ };
+
+ static void __init board_init(void)
+ {
+ ...
+ pwm_add_table(board_pwm_lookup, ARRAY_SIZE(board_pwm_lookup));
+ ...
+ }
+
+Using PWMs
+----------
+
+Consumers use the pwm_get() function and pass to it the consumer device or a
+consumer name. pwm_put() is used to free the PWM device. Managed variants of
+the getter, devm_pwm_get() and devm_fwnode_pwm_get(), also exist.
+
+After being requested, a PWM has to be configured using::
+
+ int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state);
+
+This API controls both the PWM period/duty_cycle config and the
+enable/disable state.
+
+As a consumer, don't rely on the output's state for a disabled PWM. If it's
+easily possible, drivers are supposed to emit the inactive state, but some
+drivers cannot. If you rely on getting the inactive state, use .duty_cycle=0,
+.enabled=true.
+
+There is also a usage_power setting: If set, the PWM driver is only required to
+maintain the power output but has more freedom regarding signal form.
+If supported by the driver, the signal can be optimized, for example to improve
+EMI by phase shifting the individual channels of a chip.
+
+The pwm_config(), pwm_enable() and pwm_disable() functions are just wrappers
+around pwm_apply_state() and should not be used if the user wants to change
+several parameter at once. For example, if you see pwm_config() and
+pwm_{enable,disable}() calls in the same function, this probably means you
+should switch to pwm_apply_state().
+
+The PWM user API also allows one to query the PWM state that was passed to the
+last invocation of pwm_apply_state() using pwm_get_state(). Note this is
+different to what the driver has actually implemented if the request cannot be
+satisfied exactly with the hardware in use. There is currently no way for
+consumers to get the actually implemented settings.
+
+In addition to the PWM state, the PWM API also exposes PWM arguments, which
+are the reference PWM config one should use on this PWM.
+PWM arguments are usually platform-specific and allows the PWM user to only
+care about dutycycle relatively to the full period (like, duty = 50% of the
+period). struct pwm_args contains 2 fields (period and polarity) and should
+be used to set the initial PWM config (usually done in the probe function
+of the PWM user). PWM arguments are retrieved with pwm_get_args().
+
+All consumers should really be reconfiguring the PWM upon resume as
+appropriate. This is the only way to ensure that everything is resumed in
+the proper order.
+
+Using PWMs with the sysfs interface
+-----------------------------------
+
+If CONFIG_SYSFS is enabled in your kernel configuration a simple sysfs
+interface is provided to use the PWMs from userspace. It is exposed at
+/sys/class/pwm/. Each probed PWM controller/chip will be exported as
+pwmchipN, where N is the base of the PWM chip. Inside the directory you
+will find:
+
+ npwm
+ The number of PWM channels this chip supports (read-only).
+
+ export
+ Exports a PWM channel for use with sysfs (write-only).
+
+ unexport
+ Unexports a PWM channel from sysfs (write-only).
+
+The PWM channels are numbered using a per-chip index from 0 to npwm-1.
+
+When a PWM channel is exported a pwmX directory will be created in the
+pwmchipN directory it is associated with, where X is the number of the
+channel that was exported. The following properties will then be available:
+
+ period
+ The total period of the PWM signal (read/write).
+ Value is in nanoseconds and is the sum of the active and inactive
+ time of the PWM.
+
+ duty_cycle
+ The active time of the PWM signal (read/write).
+ Value is in nanoseconds and must be less than the period.
+
+ polarity
+ Changes the polarity of the PWM signal (read/write).
+ Writes to this property only work if the PWM chip supports changing
+ the polarity. The polarity can only be changed if the PWM is not
+ enabled. Value is the string "normal" or "inversed".
+
+ enable
+ Enable/disable the PWM signal (read/write).
+
+ - 0 - disabled
+ - 1 - enabled
+
+Implementing a PWM driver
+-------------------------
+
+Currently there are two ways to implement pwm drivers. Traditionally
+there only has been the barebone API meaning that each driver has
+to implement the pwm_*() functions itself. This means that it's impossible
+to have multiple PWM drivers in the system. For this reason it's mandatory
+for new drivers to use the generic PWM framework.
+
+A new PWM controller/chip can be added using pwmchip_add() and removed
+again with pwmchip_remove(). pwmchip_add() takes a filled in struct
+pwm_chip as argument which provides a description of the PWM chip, the
+number of PWM devices provided by the chip and the chip-specific
+implementation of the supported PWM operations to the framework.
+
+When implementing polarity support in a PWM driver, make sure to respect the
+signal conventions in the PWM framework. By definition, normal polarity
+characterizes a signal starts high for the duration of the duty cycle and
+goes low for the remainder of the period. Conversely, a signal with inversed
+polarity starts low for the duration of the duty cycle and goes high for the
+remainder of the period.
+
+Drivers are encouraged to implement ->apply() instead of the legacy
+->enable(), ->disable() and ->config() methods. Doing that should provide
+atomicity in the PWM config workflow, which is required when the PWM controls
+a critical device (like a regulator).
+
+The implementation of ->get_state() (a method used to retrieve initial PWM
+state) is also encouraged for the same reason: letting the PWM user know
+about the current PWM state would allow him to avoid glitches.
+
+Drivers should not implement any power management. In other words,
+consumers should implement it as described in the "Using PWMs" section.
+
+Locking
+-------
+
+The PWM core list manipulations are protected by a mutex, so pwm_get()
+and pwm_put() may not be called from an atomic context. Currently the
+PWM core does not enforce any locking to pwm_enable(), pwm_disable() and
+pwm_config(), so the calling context is currently driver specific. This
+is an issue derived from the former barebone API and should be fixed soon.
+
+Helpers
+-------
+
+Currently a PWM can only be configured with period_ns and duty_ns. For several
+use cases freq_hz and duty_percent might be better. Instead of calculating
+this in your driver please consider adding appropriate helpers to the framework.
diff --git a/Documentation/driver-api/rapidio/index.rst b/Documentation/driver-api/rapidio/index.rst
new file mode 100644
index 0000000000..a41b4242d1
--- /dev/null
+++ b/Documentation/driver-api/rapidio/index.rst
@@ -0,0 +1,15 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===========================
+The Linux RapidIO Subsystem
+===========================
+
+.. toctree::
+ :maxdepth: 1
+
+ rapidio
+ sysfs
+
+ tsi721
+ mport_cdev
+ rio_cm
diff --git a/Documentation/driver-api/rapidio/mport_cdev.rst b/Documentation/driver-api/rapidio/mport_cdev.rst
new file mode 100644
index 0000000000..df77a7f7be
--- /dev/null
+++ b/Documentation/driver-api/rapidio/mport_cdev.rst
@@ -0,0 +1,110 @@
+==================================================================
+RapidIO subsystem mport character device driver (rio_mport_cdev.c)
+==================================================================
+
+1. Overview
+===========
+
+This device driver is the result of collaboration within the RapidIO.org
+Software Task Group (STG) between Texas Instruments, Freescale,
+Prodrive Technologies, Nokia Networks, BAE and IDT. Additional input was
+received from other members of RapidIO.org. The objective was to create a
+character mode driver interface which exposes the capabilities of RapidIO
+devices directly to applications, in a manner that allows the numerous and
+varied RapidIO implementations to interoperate.
+
+This driver (MPORT_CDEV) provides access to basic RapidIO subsystem operations
+for user-space applications. Most of RapidIO operations are supported through
+'ioctl' system calls.
+
+When loaded this device driver creates filesystem nodes named rio_mportX in /dev
+directory for each registered RapidIO mport device. 'X' in the node name matches
+to unique port ID assigned to each local mport device.
+
+Using available set of ioctl commands user-space applications can perform
+following RapidIO bus and subsystem operations:
+
+- Reads and writes from/to configuration registers of mport devices
+ (RIO_MPORT_MAINT_READ_LOCAL/RIO_MPORT_MAINT_WRITE_LOCAL)
+- Reads and writes from/to configuration registers of remote RapidIO devices.
+ This operations are defined as RapidIO Maintenance reads/writes in RIO spec.
+ (RIO_MPORT_MAINT_READ_REMOTE/RIO_MPORT_MAINT_WRITE_REMOTE)
+- Set RapidIO Destination ID for mport devices (RIO_MPORT_MAINT_HDID_SET)
+- Set RapidIO Component Tag for mport devices (RIO_MPORT_MAINT_COMPTAG_SET)
+- Query logical index of mport devices (RIO_MPORT_MAINT_PORT_IDX_GET)
+- Query capabilities and RapidIO link configuration of mport devices
+ (RIO_MPORT_GET_PROPERTIES)
+- Enable/Disable reporting of RapidIO doorbell events to user-space applications
+ (RIO_ENABLE_DOORBELL_RANGE/RIO_DISABLE_DOORBELL_RANGE)
+- Enable/Disable reporting of RIO port-write events to user-space applications
+ (RIO_ENABLE_PORTWRITE_RANGE/RIO_DISABLE_PORTWRITE_RANGE)
+- Query/Control type of events reported through this driver: doorbells,
+ port-writes or both (RIO_SET_EVENT_MASK/RIO_GET_EVENT_MASK)
+- Configure/Map mport's outbound requests window(s) for specific size,
+ RapidIO destination ID, hopcount and request type
+ (RIO_MAP_OUTBOUND/RIO_UNMAP_OUTBOUND)
+- Configure/Map mport's inbound requests window(s) for specific size,
+ RapidIO base address and local memory base address
+ (RIO_MAP_INBOUND/RIO_UNMAP_INBOUND)
+- Allocate/Free contiguous DMA coherent memory buffer for DMA data transfers
+ to/from remote RapidIO devices (RIO_ALLOC_DMA/RIO_FREE_DMA)
+- Initiate DMA data transfers to/from remote RapidIO devices (RIO_TRANSFER).
+ Supports blocking, asynchronous and posted (a.k.a 'fire-and-forget') data
+ transfer modes.
+- Check/Wait for completion of asynchronous DMA data transfer
+ (RIO_WAIT_FOR_ASYNC)
+- Manage device objects supported by RapidIO subsystem (RIO_DEV_ADD/RIO_DEV_DEL).
+ This allows implementation of various RapidIO fabric enumeration algorithms
+ as user-space applications while using remaining functionality provided by
+ kernel RapidIO subsystem.
+
+2. Hardware Compatibility
+=========================
+
+This device driver uses standard interfaces defined by kernel RapidIO subsystem
+and therefore it can be used with any mport device driver registered by RapidIO
+subsystem with limitations set by available mport implementation.
+
+At this moment the most common limitation is availability of RapidIO-specific
+DMA engine framework for specific mport device. Users should verify available
+functionality of their platform when planning to use this driver:
+
+- IDT Tsi721 PCIe-to-RapidIO bridge device and its mport device driver are fully
+ compatible with this driver.
+- Freescale SoCs 'fsl_rio' mport driver does not have implementation for RapidIO
+ specific DMA engine support and therefore DMA data transfers mport_cdev driver
+ are not available.
+
+3. Module parameters
+====================
+
+- 'dma_timeout'
+ - DMA transfer completion timeout (in msec, default value 3000).
+ This parameter set a maximum completion wait time for SYNC mode DMA
+ transfer requests and for RIO_WAIT_FOR_ASYNC ioctl requests.
+
+- 'dbg_level'
+ - This parameter allows to control amount of debug information
+ generated by this device driver. This parameter is formed by set of
+ bit masks that correspond to the specific functional blocks.
+ For mask definitions see 'drivers/rapidio/devices/rio_mport_cdev.c'
+ This parameter can be changed dynamically.
+ Use CONFIG_RAPIDIO_DEBUG=y to enable debug output at the top level.
+
+4. Known problems
+=================
+
+ None.
+
+5. User-space Applications and API
+==================================
+
+API library and applications that use this device driver are available from
+RapidIO.org.
+
+6. TODO List
+============
+
+- Add support for sending/receiving "raw" RapidIO messaging packets.
+- Add memory mapped DMA data transfers as an option when RapidIO-specific DMA
+ is not available.
diff --git a/Documentation/driver-api/rapidio/rapidio.rst b/Documentation/driver-api/rapidio/rapidio.rst
new file mode 100644
index 0000000000..74c552ad3e
--- /dev/null
+++ b/Documentation/driver-api/rapidio/rapidio.rst
@@ -0,0 +1,362 @@
+============
+Introduction
+============
+
+The RapidIO standard is a packet-based fabric interconnect standard designed for
+use in embedded systems. Development of the RapidIO standard is directed by the
+RapidIO Trade Association (RTA). The current version of the RapidIO specification
+is publicly available for download from the RTA web-site [1].
+
+This document describes the basics of the Linux RapidIO subsystem and provides
+information on its major components.
+
+1 Overview
+==========
+
+Because the RapidIO subsystem follows the Linux device model it is integrated
+into the kernel similarly to other buses by defining RapidIO-specific device and
+bus types and registering them within the device model.
+
+The Linux RapidIO subsystem is architecture independent and therefore defines
+architecture-specific interfaces that provide support for common RapidIO
+subsystem operations.
+
+2. Core Components
+==================
+
+A typical RapidIO network is a combination of endpoints and switches.
+Each of these components is represented in the subsystem by an associated data
+structure. The core logical components of the RapidIO subsystem are defined
+in include/linux/rio.h file.
+
+2.1 Master Port
+---------------
+
+A master port (or mport) is a RapidIO interface controller that is local to the
+processor executing the Linux code. A master port generates and receives RapidIO
+packets (transactions). In the RapidIO subsystem each master port is represented
+by a rio_mport data structure. This structure contains master port specific
+resources such as mailboxes and doorbells. The rio_mport also includes a unique
+host device ID that is valid when a master port is configured as an enumerating
+host.
+
+RapidIO master ports are serviced by subsystem specific mport device drivers
+that provide functionality defined for this subsystem. To provide a hardware
+independent interface for RapidIO subsystem operations, rio_mport structure
+includes rio_ops data structure which contains pointers to hardware specific
+implementations of RapidIO functions.
+
+2.2 Device
+----------
+
+A RapidIO device is any endpoint (other than mport) or switch in the network.
+All devices are presented in the RapidIO subsystem by corresponding rio_dev data
+structure. Devices form one global device list and per-network device lists
+(depending on number of available mports and networks).
+
+2.3 Switch
+----------
+
+A RapidIO switch is a special class of device that routes packets between its
+ports towards their final destination. The packet destination port within a
+switch is defined by an internal routing table. A switch is presented in the
+RapidIO subsystem by rio_dev data structure expanded by additional rio_switch
+data structure, which contains switch specific information such as copy of the
+routing table and pointers to switch specific functions.
+
+The RapidIO subsystem defines the format and initialization method for subsystem
+specific switch drivers that are designed to provide hardware-specific
+implementation of common switch management routines.
+
+2.4 Network
+-----------
+
+A RapidIO network is a combination of interconnected endpoint and switch devices.
+Each RapidIO network known to the system is represented by corresponding rio_net
+data structure. This structure includes lists of all devices and local master
+ports that form the same network. It also contains a pointer to the default
+master port that is used to communicate with devices within the network.
+
+2.5 Device Drivers
+------------------
+
+RapidIO device-specific drivers follow Linux Kernel Driver Model and are
+intended to support specific RapidIO devices attached to the RapidIO network.
+
+2.6 Subsystem Interfaces
+------------------------
+
+RapidIO interconnect specification defines features that may be used to provide
+one or more common service layers for all participating RapidIO devices. These
+common services may act separately from device-specific drivers or be used by
+device-specific drivers. Example of such service provider is the RIONET driver
+which implements Ethernet-over-RapidIO interface. Because only one driver can be
+registered for a device, all common RapidIO services have to be registered as
+subsystem interfaces. This allows to have multiple common services attached to
+the same device without blocking attachment of a device-specific driver.
+
+3. Subsystem Initialization
+===========================
+
+In order to initialize the RapidIO subsystem, a platform must initialize and
+register at least one master port within the RapidIO network. To register mport
+within the subsystem controller driver's initialization code calls function
+rio_register_mport() for each available master port.
+
+After all active master ports are registered with a RapidIO subsystem,
+an enumeration and/or discovery routine may be called automatically or
+by user-space command.
+
+RapidIO subsystem can be configured to be built as a statically linked or
+modular component of the kernel (see details below).
+
+4. Enumeration and Discovery
+============================
+
+4.1 Overview
+------------
+
+RapidIO subsystem configuration options allow users to build enumeration and
+discovery methods as statically linked components or loadable modules.
+An enumeration/discovery method implementation and available input parameters
+define how any given method can be attached to available RapidIO mports:
+simply to all available mports OR individually to the specified mport device.
+
+Depending on selected enumeration/discovery build configuration, there are
+several methods to initiate an enumeration and/or discovery process:
+
+ (a) Statically linked enumeration and discovery process can be started
+ automatically during kernel initialization time using corresponding module
+ parameters. This was the original method used since introduction of RapidIO
+ subsystem. Now this method relies on enumerator module parameter which is
+ 'rio-scan.scan' for existing basic enumeration/discovery method.
+ When automatic start of enumeration/discovery is used a user has to ensure
+ that all discovering endpoints are started before the enumerating endpoint
+ and are waiting for enumeration to be completed.
+ Configuration option CONFIG_RAPIDIO_DISC_TIMEOUT defines time that discovering
+ endpoint waits for enumeration to be completed. If the specified timeout
+ expires the discovery process is terminated without obtaining RapidIO network
+ information. NOTE: a timed out discovery process may be restarted later using
+ a user-space command as it is described below (if the given endpoint was
+ enumerated successfully).
+
+ (b) Statically linked enumeration and discovery process can be started by
+ a command from user space. This initiation method provides more flexibility
+ for a system startup compared to the option (a) above. After all participating
+ endpoints have been successfully booted, an enumeration process shall be
+ started first by issuing a user-space command, after an enumeration is
+ completed a discovery process can be started on all remaining endpoints.
+
+ (c) Modular enumeration and discovery process can be started by a command from
+ user space. After an enumeration/discovery module is loaded, a network scan
+ process can be started by issuing a user-space command.
+ Similar to the option (b) above, an enumerator has to be started first.
+
+ (d) Modular enumeration and discovery process can be started by a module
+ initialization routine. In this case an enumerating module shall be loaded
+ first.
+
+When a network scan process is started it calls an enumeration or discovery
+routine depending on the configured role of a master port: host or agent.
+
+Enumeration is performed by a master port if it is configured as a host port by
+assigning a host destination ID greater than or equal to zero. The host
+destination ID can be assigned to a master port using various methods depending
+on RapidIO subsystem build configuration:
+
+ (a) For a statically linked RapidIO subsystem core use command line parameter
+ "rapidio.hdid=" with a list of destination ID assignments in order of mport
+ device registration. For example, in a system with two RapidIO controllers
+ the command line parameter "rapidio.hdid=-1,7" will result in assignment of
+ the host destination ID=7 to the second RapidIO controller, while the first
+ one will be assigned destination ID=-1.
+
+ (b) If the RapidIO subsystem core is built as a loadable module, in addition
+ to the method shown above, the host destination ID(s) can be specified using
+ traditional methods of passing module parameter "hdid=" during its loading:
+
+ - from command line: "modprobe rapidio hdid=-1,7", or
+ - from modprobe configuration file using configuration command "options",
+ like in this example: "options rapidio hdid=-1,7". An example of modprobe
+ configuration file is provided in the section below.
+
+NOTES:
+ (i) if "hdid=" parameter is omitted all available mport will be assigned
+ destination ID = -1;
+
+ (ii) the "hdid=" parameter in systems with multiple mports can have
+ destination ID assignments omitted from the end of list (default = -1).
+
+If the host device ID for a specific master port is set to -1, the discovery
+process will be performed for it.
+
+The enumeration and discovery routines use RapidIO maintenance transactions
+to access the configuration space of devices.
+
+NOTE: If RapidIO switch-specific device drivers are built as loadable modules
+they must be loaded before enumeration/discovery process starts.
+This requirement is cased by the fact that enumeration/discovery methods invoke
+vendor-specific callbacks on early stages.
+
+4.2 Automatic Start of Enumeration and Discovery
+------------------------------------------------
+
+Automatic enumeration/discovery start method is applicable only to built-in
+enumeration/discovery RapidIO configuration selection. To enable automatic
+enumeration/discovery start by existing basic enumerator method set use boot
+command line parameter "rio-scan.scan=1".
+
+This configuration requires synchronized start of all RapidIO endpoints that
+form a network which will be enumerated/discovered. Discovering endpoints have
+to be started before an enumeration starts to ensure that all RapidIO
+controllers have been initialized and are ready to be discovered. Configuration
+parameter CONFIG_RAPIDIO_DISC_TIMEOUT defines time (in seconds) which
+a discovering endpoint will wait for enumeration to be completed.
+
+When automatic enumeration/discovery start is selected, basic method's
+initialization routine calls rio_init_mports() to perform enumeration or
+discovery for all known mport devices.
+
+Depending on RapidIO network size and configuration this automatic
+enumeration/discovery start method may be difficult to use due to the
+requirement for synchronized start of all endpoints.
+
+4.3 User-space Start of Enumeration and Discovery
+-------------------------------------------------
+
+User-space start of enumeration and discovery can be used with built-in and
+modular build configurations. For user-space controlled start RapidIO subsystem
+creates the sysfs write-only attribute file '/sys/bus/rapidio/scan'. To initiate
+an enumeration or discovery process on specific mport device, a user needs to
+write mport_ID (not RapidIO destination ID) into that file. The mport_ID is a
+sequential number (0 ... RIO_MAX_MPORTS) assigned during mport device
+registration. For example for machine with single RapidIO controller, mport_ID
+for that controller always will be 0.
+
+To initiate RapidIO enumeration/discovery on all available mports a user may
+write '-1' (or RIO_MPORT_ANY) into the scan attribute file.
+
+4.4 Basic Enumeration Method
+----------------------------
+
+This is an original enumeration/discovery method which is available since
+first release of RapidIO subsystem code. The enumeration process is
+implemented according to the enumeration algorithm outlined in the RapidIO
+Interconnect Specification: Annex I [1].
+
+This method can be configured as statically linked or loadable module.
+The method's single parameter "scan" allows to trigger the enumeration/discovery
+process from module initialization routine.
+
+This enumeration/discovery method can be started only once and does not support
+unloading if it is built as a module.
+
+The enumeration process traverses the network using a recursive depth-first
+algorithm. When a new device is found, the enumerator takes ownership of that
+device by writing into the Host Device ID Lock CSR. It does this to ensure that
+the enumerator has exclusive right to enumerate the device. If device ownership
+is successfully acquired, the enumerator allocates a new rio_dev structure and
+initializes it according to device capabilities.
+
+If the device is an endpoint, a unique device ID is assigned to it and its value
+is written into the device's Base Device ID CSR.
+
+If the device is a switch, the enumerator allocates an additional rio_switch
+structure to store switch specific information. Then the switch's vendor ID and
+device ID are queried against a table of known RapidIO switches. Each switch
+table entry contains a pointer to a switch-specific initialization routine that
+initializes pointers to the rest of switch specific operations, and performs
+hardware initialization if necessary. A RapidIO switch does not have a unique
+device ID; it relies on hopcount and routing for device ID of an attached
+endpoint if access to its configuration registers is required. If a switch (or
+chain of switches) does not have any endpoint (except enumerator) attached to
+it, a fake device ID will be assigned to configure a route to that switch.
+In the case of a chain of switches without endpoint, one fake device ID is used
+to configure a route through the entire chain and switches are differentiated by
+their hopcount value.
+
+For both endpoints and switches the enumerator writes a unique component tag
+into device's Component Tag CSR. That unique value is used by the error
+management notification mechanism to identify a device that is reporting an
+error management event.
+
+Enumeration beyond a switch is completed by iterating over each active egress
+port of that switch. For each active link, a route to a default device ID
+(0xFF for 8-bit systems and 0xFFFF for 16-bit systems) is temporarily written
+into the routing table. The algorithm recurs by calling itself with hopcount + 1
+and the default device ID in order to access the device on the active port.
+
+After the host has completed enumeration of the entire network it releases
+devices by clearing device ID locks (calls rio_clear_locks()). For each endpoint
+in the system, it sets the Discovered bit in the Port General Control CSR
+to indicate that enumeration is completed and agents are allowed to execute
+passive discovery of the network.
+
+The discovery process is performed by agents and is similar to the enumeration
+process that is described above. However, the discovery process is performed
+without changes to the existing routing because agents only gather information
+about RapidIO network structure and are building an internal map of discovered
+devices. This way each Linux-based component of the RapidIO subsystem has
+a complete view of the network. The discovery process can be performed
+simultaneously by several agents. After initializing its RapidIO master port
+each agent waits for enumeration completion by the host for the configured wait
+time period. If this wait time period expires before enumeration is completed,
+an agent skips RapidIO discovery and continues with remaining kernel
+initialization.
+
+4.5 Adding New Enumeration/Discovery Method
+-------------------------------------------
+
+RapidIO subsystem code organization allows addition of new enumeration/discovery
+methods as new configuration options without significant impact to the core
+RapidIO code.
+
+A new enumeration/discovery method has to be attached to one or more mport
+devices before an enumeration/discovery process can be started. Normally,
+method's module initialization routine calls rio_register_scan() to attach
+an enumerator to a specified mport device (or devices). The basic enumerator
+implementation demonstrates this process.
+
+4.6 Using Loadable RapidIO Switch Drivers
+-----------------------------------------
+
+In the case when RapidIO switch drivers are built as loadable modules a user
+must ensure that they are loaded before the enumeration/discovery starts.
+This process can be automated by specifying pre- or post- dependencies in the
+RapidIO-specific modprobe configuration file as shown in the example below.
+
+File /etc/modprobe.d/rapidio.conf::
+
+ # Configure RapidIO subsystem modules
+
+ # Set enumerator host destination ID (overrides kernel command line option)
+ options rapidio hdid=-1,2
+
+ # Load RapidIO switch drivers immediately after rapidio core module was loaded
+ softdep rapidio post: idt_gen2 idtcps tsi57x
+
+ # OR :
+
+ # Load RapidIO switch drivers just before rio-scan enumerator module is loaded
+ softdep rio-scan pre: idt_gen2 idtcps tsi57x
+
+ --------------------------
+
+NOTE:
+ In the example above, one of "softdep" commands must be removed or
+ commented out to keep required module loading sequence.
+
+5. References
+=============
+
+[1] RapidIO Trade Association. RapidIO Interconnect Specifications.
+ http://www.rapidio.org.
+
+[2] Rapidio TA. Technology Comparisons.
+ http://www.rapidio.org/education/technology_comparisons/
+
+[3] RapidIO support for Linux.
+ https://lwn.net/Articles/139118/
+
+[4] Matt Porter. RapidIO for Linux. Ottawa Linux Symposium, 2005
+ https://www.kernel.org/doc/ols/2005/ols2005v2-pages-43-56.pdf
diff --git a/Documentation/driver-api/rapidio/rio_cm.rst b/Documentation/driver-api/rapidio/rio_cm.rst
new file mode 100644
index 0000000000..5294430a7a
--- /dev/null
+++ b/Documentation/driver-api/rapidio/rio_cm.rst
@@ -0,0 +1,135 @@
+==========================================================================
+RapidIO subsystem Channelized Messaging character device driver (rio_cm.c)
+==========================================================================
+
+
+1. Overview
+===========
+
+This device driver is the result of collaboration within the RapidIO.org
+Software Task Group (STG) between Texas Instruments, Prodrive Technologies,
+Nokia Networks, BAE and IDT. Additional input was received from other members
+of RapidIO.org.
+
+The objective was to create a character mode driver interface which exposes
+messaging capabilities of RapidIO endpoint devices (mports) directly
+to applications, in a manner that allows the numerous and varied RapidIO
+implementations to interoperate.
+
+This driver (RIO_CM) provides to user-space applications shared access to
+RapidIO mailbox messaging resources.
+
+RapidIO specification (Part 2) defines that endpoint devices may have up to four
+messaging mailboxes in case of multi-packet message (up to 4KB) and
+up to 64 mailboxes if single-packet messages (up to 256 B) are used. In addition
+to protocol definition limitations, a particular hardware implementation can
+have reduced number of messaging mailboxes. RapidIO aware applications must
+therefore share the messaging resources of a RapidIO endpoint.
+
+Main purpose of this device driver is to provide RapidIO mailbox messaging
+capability to large number of user-space processes by introducing socket-like
+operations using a single messaging mailbox. This allows applications to
+use the limited RapidIO messaging hardware resources efficiently.
+
+Most of device driver's operations are supported through 'ioctl' system calls.
+
+When loaded this device driver creates a single file system node named rio_cm
+in /dev directory common for all registered RapidIO mport devices.
+
+Following ioctl commands are available to user-space applications:
+
+- RIO_CM_MPORT_GET_LIST:
+ Returns to caller list of local mport devices that
+ support messaging operations (number of entries up to RIO_MAX_MPORTS).
+ Each list entry is combination of mport's index in the system and RapidIO
+ destination ID assigned to the port.
+- RIO_CM_EP_GET_LIST_SIZE:
+ Returns number of messaging capable remote endpoints
+ in a RapidIO network associated with the specified mport device.
+- RIO_CM_EP_GET_LIST:
+ Returns list of RapidIO destination IDs for messaging
+ capable remote endpoints (peers) available in a RapidIO network associated
+ with the specified mport device.
+- RIO_CM_CHAN_CREATE:
+ Creates RapidIO message exchange channel data structure
+ with channel ID assigned automatically or as requested by a caller.
+- RIO_CM_CHAN_BIND:
+ Binds the specified channel data structure to the specified
+ mport device.
+- RIO_CM_CHAN_LISTEN:
+ Enables listening for connection requests on the specified
+ channel.
+- RIO_CM_CHAN_ACCEPT:
+ Accepts a connection request from peer on the specified
+ channel. If wait timeout for this request is specified by a caller it is
+ a blocking call. If timeout set to 0 this is non-blocking call - ioctl
+ handler checks for a pending connection request and if one is not available
+ exits with -EGAIN error status immediately.
+- RIO_CM_CHAN_CONNECT:
+ Sends a connection request to a remote peer/channel.
+- RIO_CM_CHAN_SEND:
+ Sends a data message through the specified channel.
+ The handler for this request assumes that message buffer specified by
+ a caller includes the reserved space for a packet header required by
+ this driver.
+- RIO_CM_CHAN_RECEIVE:
+ Receives a data message through a connected channel.
+ If the channel does not have an incoming message ready to return this ioctl
+ handler will wait for new message until timeout specified by a caller
+ expires. If timeout value is set to 0, ioctl handler uses a default value
+ defined by MAX_SCHEDULE_TIMEOUT.
+- RIO_CM_CHAN_CLOSE:
+ Closes a specified channel and frees associated buffers.
+ If the specified channel is in the CONNECTED state, sends close notification
+ to the remote peer.
+
+The ioctl command codes and corresponding data structures intended for use by
+user-space applications are defined in 'include/uapi/linux/rio_cm_cdev.h'.
+
+2. Hardware Compatibility
+=========================
+
+This device driver uses standard interfaces defined by kernel RapidIO subsystem
+and therefore it can be used with any mport device driver registered by RapidIO
+subsystem with limitations set by available mport HW implementation of messaging
+mailboxes.
+
+3. Module parameters
+====================
+
+- 'dbg_level'
+ - This parameter allows to control amount of debug information
+ generated by this device driver. This parameter is formed by set of
+ bit masks that correspond to the specific functional block.
+ For mask definitions see 'drivers/rapidio/devices/rio_cm.c'
+ This parameter can be changed dynamically.
+ Use CONFIG_RAPIDIO_DEBUG=y to enable debug output at the top level.
+
+- 'cmbox'
+ - Number of RapidIO mailbox to use (default value is 1).
+ This parameter allows to set messaging mailbox number that will be used
+ within entire RapidIO network. It can be used when default mailbox is
+ used by other device drivers or is not supported by some nodes in the
+ RapidIO network.
+
+- 'chstart'
+ - Start channel number for dynamic assignment. Default value - 256.
+ Allows to exclude channel numbers below this parameter from dynamic
+ allocation to avoid conflicts with software components that use
+ reserved predefined channel numbers.
+
+4. Known problems
+=================
+
+ None.
+
+5. User-space Applications and API Library
+==========================================
+
+Messaging API library and applications that use this device driver are available
+from RapidIO.org.
+
+6. TODO List
+============
+
+- Add support for system notification messages (reserved channel 0).
diff --git a/Documentation/driver-api/rapidio/sysfs.rst b/Documentation/driver-api/rapidio/sysfs.rst
new file mode 100644
index 0000000000..540f726834
--- /dev/null
+++ b/Documentation/driver-api/rapidio/sysfs.rst
@@ -0,0 +1,7 @@
+=============
+Sysfs entries
+=============
+
+The RapidIO sysfs files have moved to:
+Documentation/ABI/testing/sysfs-bus-rapidio and
+Documentation/ABI/testing/sysfs-class-rapidio
diff --git a/Documentation/driver-api/rapidio/tsi721.rst b/Documentation/driver-api/rapidio/tsi721.rst
new file mode 100644
index 0000000000..42aea438cd
--- /dev/null
+++ b/Documentation/driver-api/rapidio/tsi721.rst
@@ -0,0 +1,112 @@
+=========================================================================
+RapidIO subsystem mport driver for IDT Tsi721 PCI Express-to-SRIO bridge.
+=========================================================================
+
+1. Overview
+===========
+
+This driver implements all currently defined RapidIO mport callback functions.
+It supports maintenance read and write operations, inbound and outbound RapidIO
+doorbells, inbound maintenance port-writes and RapidIO messaging.
+
+To generate SRIO maintenance transactions this driver uses one of Tsi721 DMA
+channels. This mechanism provides access to larger range of hop counts and
+destination IDs without need for changes in outbound window translation.
+
+RapidIO messaging support uses dedicated messaging channels for each mailbox.
+For inbound messages this driver uses destination ID matching to forward messages
+into the corresponding message queue. Messaging callbacks are implemented to be
+fully compatible with RIONET driver (Ethernet over RapidIO messaging services).
+
+1. Module parameters:
+
+- 'dbg_level'
+ - This parameter allows to control amount of debug information
+ generated by this device driver. This parameter is formed by set of
+ This parameter can be changed bit masks that correspond to the specific
+ functional block.
+ For mask definitions see 'drivers/rapidio/devices/tsi721.h'
+ This parameter can be changed dynamically.
+ Use CONFIG_RAPIDIO_DEBUG=y to enable debug output at the top level.
+
+- 'dma_desc_per_channel'
+ - This parameter defines number of hardware buffer
+ descriptors allocated for each registered Tsi721 DMA channel.
+ Its default value is 128.
+
+- 'dma_txqueue_sz'
+ - DMA transactions queue size. Defines number of pending
+ transaction requests that can be accepted by each DMA channel.
+ Default value is 16.
+
+- 'dma_sel'
+ - DMA channel selection mask. Bitmask that defines which hardware
+ DMA channels (0 ... 6) will be registered with DmaEngine core.
+ If bit is set to 1, the corresponding DMA channel will be registered.
+ DMA channels not selected by this mask will not be used by this device
+ driver. Default value is 0x7f (use all channels).
+
+- 'pcie_mrrs'
+ - override value for PCIe Maximum Read Request Size (MRRS).
+ This parameter gives an ability to override MRRS value set during PCIe
+ configuration process. Tsi721 supports read request sizes up to 4096B.
+ Value for this parameter must be set as defined by PCIe specification:
+ 0 = 128B, 1 = 256B, 2 = 512B, 3 = 1024B, 4 = 2048B and 5 = 4096B.
+ Default value is '-1' (= keep platform setting).
+
+- 'mbox_sel'
+ - RIO messaging MBOX selection mask. This is a bitmask that defines
+ messaging MBOXes are managed by this device driver. Mask bits 0 - 3
+ correspond to MBOX0 - MBOX3. MBOX is under driver's control if the
+ corresponding bit is set to '1'. Default value is 0x0f (= all).
+
+2. Known problems
+=================
+
+ None.
+
+3. DMA Engine Support
+=====================
+
+Tsi721 mport driver supports DMA data transfers between local system memory and
+remote RapidIO devices. This functionality is implemented according to SLAVE
+mode API defined by common Linux kernel DMA Engine framework.
+
+Depending on system requirements RapidIO DMA operations can be included/excluded
+by setting CONFIG_RAPIDIO_DMA_ENGINE option. Tsi721 miniport driver uses seven
+out of eight available BDMA channels to support DMA data transfers.
+One BDMA channel is reserved for generation of maintenance read/write requests.
+
+If Tsi721 mport driver have been built with RAPIDIO_DMA_ENGINE support included,
+this driver will accept DMA-specific module parameter:
+
+ "dma_desc_per_channel"
+ - defines number of hardware buffer descriptors used by
+ each BDMA channel of Tsi721 (by default - 128).
+
+4. Version History
+
+ ===== ====================================================================
+ 1.1.0 DMA operations re-worked to support data scatter/gather lists larger
+ than hardware buffer descriptors ring.
+ 1.0.0 Initial driver release.
+ ===== ====================================================================
+
+5. License
+===========
+
+ Copyright(c) 2011 Integrated Device Technology, Inc. All rights reserved.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ more details.
+
+ You should have received a copy of the GNU General Public License along with
+ this program; if not, write to the Free Software Foundation, Inc.,
+ 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
diff --git a/Documentation/driver-api/regulator.rst b/Documentation/driver-api/regulator.rst
new file mode 100644
index 0000000000..b43c78eb24
--- /dev/null
+++ b/Documentation/driver-api/regulator.rst
@@ -0,0 +1,170 @@
+.. Copyright 2007-2008 Wolfson Microelectronics
+
+.. This documentation is free software; you can redistribute
+.. it and/or modify it under the terms of the GNU General Public
+.. License version 2 as published by the Free Software Foundation.
+
+=================================
+Voltage and current regulator API
+=================================
+
+:Author: Liam Girdwood
+:Author: Mark Brown
+
+Introduction
+============
+
+This framework is designed to provide a standard kernel interface to
+control voltage and current regulators.
+
+The intention is to allow systems to dynamically control regulator power
+output in order to save power and prolong battery life. This applies to
+both voltage regulators (where voltage output is controllable) and
+current sinks (where current limit is controllable).
+
+Note that additional (and currently more complete) documentation is
+available in the Linux kernel source under
+``Documentation/power/regulator``.
+
+Glossary
+--------
+
+The regulator API uses a number of terms which may not be familiar:
+
+Regulator
+
+ Electronic device that supplies power to other devices. Most regulators
+ can enable and disable their output and some can also control their
+ output voltage or current.
+
+Consumer
+
+ Electronic device which consumes power provided by a regulator. These
+ may either be static, requiring only a fixed supply, or dynamic,
+ requiring active management of the regulator at runtime.
+
+Power Domain
+
+ The electronic circuit supplied by a given regulator, including the
+ regulator and all consumer devices. The configuration of the regulator
+ is shared between all the components in the circuit.
+
+Power Management Integrated Circuit (PMIC)
+
+ An IC which contains numerous regulators and often also other
+ subsystems. In an embedded system the primary PMIC is often equivalent
+ to a combination of the PSU and southbridge in a desktop system.
+
+Consumer driver interface
+=========================
+
+This offers a similar API to the kernel clock framework. Consumer
+drivers use `get <#API-regulator-get>`__ and
+`put <#API-regulator-put>`__ operations to acquire and release
+regulators. Functions are provided to `enable <#API-regulator-enable>`__
+and `disable <#API-regulator-disable>`__ the regulator and to get and
+set the runtime parameters of the regulator.
+
+When requesting regulators consumers use symbolic names for their
+supplies, such as "Vcc", which are mapped into actual regulator devices
+by the machine interface.
+
+A stub version of this API is provided when the regulator framework is
+not in use in order to minimise the need to use ifdefs.
+
+Enabling and disabling
+----------------------
+
+The regulator API provides reference counted enabling and disabling of
+regulators. Consumer devices use the :c:func:`regulator_enable()` and
+:c:func:`regulator_disable()` functions to enable and disable
+regulators. Calls to the two functions must be balanced.
+
+Note that since multiple consumers may be using a regulator and machine
+constraints may not allow the regulator to be disabled there is no
+guarantee that calling :c:func:`regulator_disable()` will actually
+cause the supply provided by the regulator to be disabled. Consumer
+drivers should assume that the regulator may be enabled at all times.
+
+Configuration
+-------------
+
+Some consumer devices may need to be able to dynamically configure their
+supplies. For example, MMC drivers may need to select the correct
+operating voltage for their cards. This may be done while the regulator
+is enabled or disabled.
+
+The :c:func:`regulator_set_voltage()` and
+:c:func:`regulator_set_current_limit()` functions provide the primary
+interface for this. Both take ranges of voltages and currents, supporting
+drivers that do not require a specific value (eg, CPU frequency scaling
+normally permits the CPU to use a wider range of supply voltages at lower
+frequencies but does not require that the supply voltage be lowered). Where
+an exact value is required both minimum and maximum values should be
+identical.
+
+Callbacks
+---------
+
+Callbacks may also be registered for events such as regulation failures.
+
+Regulator driver interface
+==========================
+
+Drivers for regulator chips register the regulators with the regulator
+core, providing operations structures to the core. A notifier interface
+allows error conditions to be reported to the core.
+
+Registration should be triggered by explicit setup done by the platform,
+supplying a struct regulator_init_data for the regulator
+containing constraint and supply information.
+
+Machine interface
+=================
+
+This interface provides a way to define how regulators are connected to
+consumers on a given system and what the valid operating parameters are
+for the system.
+
+Supplies
+--------
+
+Regulator supplies are specified using struct
+:c:type:`regulator_consumer_supply`. This is done at driver registration
+time as part of the machine constraints.
+
+Constraints
+-----------
+
+As well as defining the connections the machine interface also provides
+constraints defining the operations that clients are allowed to perform
+and the parameters that may be set. This is required since generally
+regulator devices will offer more flexibility than it is safe to use on
+a given system, for example supporting higher supply voltages than the
+consumers are rated for.
+
+This is done at driver registration time` by providing a
+struct regulation_constraints.
+
+The constraints may also specify an initial configuration for the
+regulator in the constraints, which is particularly useful for use with
+static consumers.
+
+API reference
+=============
+
+Due to limitations of the kernel documentation framework and the
+existing layout of the source code the entire regulator API is
+documented here.
+
+.. kernel-doc:: include/linux/regulator/consumer.h
+ :internal:
+
+.. kernel-doc:: include/linux/regulator/machine.h
+ :internal:
+
+.. kernel-doc:: include/linux/regulator/driver.h
+ :internal:
+
+.. kernel-doc:: drivers/regulator/core.c
+ :export:
diff --git a/Documentation/driver-api/reset.rst b/Documentation/driver-api/reset.rst
new file mode 100644
index 0000000000..84e03d7039
--- /dev/null
+++ b/Documentation/driver-api/reset.rst
@@ -0,0 +1,221 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+====================
+Reset controller API
+====================
+
+Introduction
+============
+
+Reset controllers are central units that control the reset signals to multiple
+peripherals.
+The reset controller API is split into two parts:
+the `consumer driver interface <#consumer-driver-interface>`__ (`API reference
+<#reset-consumer-api>`__), which allows peripheral drivers to request control
+over their reset input signals, and the `reset controller driver interface
+<#reset-controller-driver-interface>`__ (`API reference
+<#reset-controller-driver-api>`__), which is used by drivers for reset
+controller devices to register their reset controls to provide them to the
+consumers.
+
+While some reset controller hardware units also implement system restart
+functionality, restart handlers are out of scope for the reset controller API.
+
+Glossary
+--------
+
+The reset controller API uses these terms with a specific meaning:
+
+Reset line
+
+ Physical reset line carrying a reset signal from a reset controller
+ hardware unit to a peripheral module.
+
+Reset control
+
+ Control method that determines the state of one or multiple reset lines.
+ Most commonly this is a single bit in reset controller register space that
+ either allows direct control over the physical state of the reset line, or
+ is self-clearing and can be used to trigger a predetermined pulse on the
+ reset line.
+ In more complicated reset controls, a single trigger action can launch a
+ carefully timed sequence of pulses on multiple reset lines.
+
+Reset controller
+
+ A hardware module that provides a number of reset controls to control a
+ number of reset lines.
+
+Reset consumer
+
+ Peripheral module or external IC that is put into reset by the signal on a
+ reset line.
+
+Consumer driver interface
+=========================
+
+This interface provides an API that is similar to the kernel clock framework.
+Consumer drivers use get and put operations to acquire and release reset
+controls.
+Functions are provided to assert and deassert the controlled reset lines,
+trigger reset pulses, or to query reset line status.
+
+When requesting reset controls, consumers can use symbolic names for their
+reset inputs, which are mapped to an actual reset control on an existing reset
+controller device by the core.
+
+A stub version of this API is provided when the reset controller framework is
+not in use in order to minimize the need to use ifdefs.
+
+Shared and exclusive resets
+---------------------------
+
+The reset controller API provides either reference counted deassertion and
+assertion or direct, exclusive control.
+The distinction between shared and exclusive reset controls is made at the time
+the reset control is requested, either via devm_reset_control_get_shared() or
+via devm_reset_control_get_exclusive().
+This choice determines the behavior of the API calls made with the reset
+control.
+
+Shared resets behave similarly to clocks in the kernel clock framework.
+They provide reference counted deassertion, where only the first deassert,
+which increments the deassertion reference count to one, and the last assert
+which decrements the deassertion reference count back to zero, have a physical
+effect on the reset line.
+
+Exclusive resets on the other hand guarantee direct control.
+That is, an assert causes the reset line to be asserted immediately, and a
+deassert causes the reset line to be deasserted immediately.
+
+Assertion and deassertion
+-------------------------
+
+Consumer drivers use the reset_control_assert() and reset_control_deassert()
+functions to assert and deassert reset lines.
+For shared reset controls, calls to the two functions must be balanced.
+
+Note that since multiple consumers may be using a shared reset control, there
+is no guarantee that calling reset_control_assert() on a shared reset control
+will actually cause the reset line to be asserted.
+Consumer drivers using shared reset controls should assume that the reset line
+may be kept deasserted at all times.
+The API only guarantees that the reset line can not be asserted as long as any
+consumer has requested it to be deasserted.
+
+Triggering
+----------
+
+Consumer drivers use reset_control_reset() to trigger a reset pulse on a
+self-deasserting reset control.
+In general, these resets can not be shared between multiple consumers, since
+requesting a pulse from any consumer driver will reset all connected
+peripherals.
+
+The reset controller API allows requesting self-deasserting reset controls as
+shared, but for those only the first trigger request causes an actual pulse to
+be issued on the reset line.
+All further calls to this function have no effect until all consumers have
+called reset_control_rearm().
+For shared reset controls, calls to the two functions must be balanced.
+This allows devices that only require an initial reset at any point before the
+driver is probed or resumed to share a pulsed reset line.
+
+Querying
+--------
+
+Only some reset controllers support querying the current status of a reset
+line, via reset_control_status().
+If supported, this function returns a positive non-zero value if the given
+reset line is asserted.
+The reset_control_status() function does not accept a
+`reset control array <#reset-control-arrays>`__ handle as its input parameter.
+
+Optional resets
+---------------
+
+Often peripherals require a reset line on some platforms but not on others.
+For this, reset controls can be requested as optional using
+devm_reset_control_get_optional_exclusive() or
+devm_reset_control_get_optional_shared().
+These functions return a NULL pointer instead of an error when the requested
+reset control is not specified in the device tree.
+Passing a NULL pointer to the reset_control functions causes them to return
+quietly without an error.
+
+Reset control arrays
+--------------------
+
+Some drivers need to assert a bunch of reset lines in no particular order.
+devm_reset_control_array_get() returns an opaque reset control handle that can
+be used to assert, deassert, or trigger all specified reset controls at once.
+The reset control API does not guarantee the order in which the individual
+controls therein are handled.
+
+Reset controller driver interface
+=================================
+
+Drivers for reset controller modules provide the functionality necessary to
+assert or deassert reset signals, to trigger a reset pulse on a reset line, or
+to query its current state.
+All functions are optional.
+
+Initialization
+--------------
+
+Drivers fill a struct :c:type:`reset_controller_dev` and register it with
+reset_controller_register() in their probe function.
+The actual functionality is implemented in callback functions via a struct
+:c:type:`reset_control_ops`.
+
+API reference
+=============
+
+The reset controller API is documented here in two parts:
+the `reset consumer API <#reset-consumer-api>`__ and the `reset controller
+driver API <#reset-controller-driver-api>`__.
+
+Reset consumer API
+------------------
+
+Reset consumers can control a reset line using an opaque reset control handle,
+which can be obtained from devm_reset_control_get_exclusive() or
+devm_reset_control_get_shared().
+Given the reset control, consumers can call reset_control_assert() and
+reset_control_deassert(), trigger a reset pulse using reset_control_reset(), or
+query the reset line status using reset_control_status().
+
+.. kernel-doc:: include/linux/reset.h
+ :internal:
+
+.. kernel-doc:: drivers/reset/core.c
+ :functions: reset_control_reset
+ reset_control_assert
+ reset_control_deassert
+ reset_control_status
+ reset_control_acquire
+ reset_control_release
+ reset_control_rearm
+ reset_control_put
+ of_reset_control_get_count
+ of_reset_control_array_get
+ devm_reset_control_array_get
+ reset_control_get_count
+
+Reset controller driver API
+---------------------------
+
+Reset controller drivers are supposed to implement the necessary functions in
+a static constant structure :c:type:`reset_control_ops`, allocate and fill out
+a struct :c:type:`reset_controller_dev`, and register it using
+devm_reset_controller_register().
+
+.. kernel-doc:: include/linux/reset-controller.h
+ :internal:
+
+.. kernel-doc:: drivers/reset/core.c
+ :functions: of_reset_simple_xlate
+ reset_controller_register
+ reset_controller_unregister
+ devm_reset_controller_register
+ reset_controller_add_lookup
diff --git a/Documentation/driver-api/rfkill.rst b/Documentation/driver-api/rfkill.rst
new file mode 100644
index 0000000000..7d3684e81d
--- /dev/null
+++ b/Documentation/driver-api/rfkill.rst
@@ -0,0 +1,132 @@
+===============================
+rfkill - RF kill switch support
+===============================
+
+
+.. contents::
+ :depth: 2
+
+Introduction
+============
+
+The rfkill subsystem provides a generic interface for disabling any radio
+transmitter in the system. When a transmitter is blocked, it shall not
+radiate any power.
+
+The subsystem also provides the ability to react on button presses and
+disable all transmitters of a certain type (or all). This is intended for
+situations where transmitters need to be turned off, for example on
+aircraft.
+
+The rfkill subsystem has a concept of "hard" and "soft" block, which
+differ little in their meaning (block == transmitters off) but rather in
+whether they can be changed or not:
+
+ - hard block
+ read-only radio block that cannot be overridden by software
+
+ - soft block
+ writable radio block (need not be readable) that is set by
+ the system software.
+
+The rfkill subsystem has two parameters, rfkill.default_state and
+rfkill.master_switch_mode, which are documented in
+admin-guide/kernel-parameters.rst.
+
+
+Implementation details
+======================
+
+The rfkill subsystem is composed of three main components:
+
+ * the rfkill core,
+ * the deprecated rfkill-input module (an input layer handler, being
+ replaced by userspace policy code) and
+ * the rfkill drivers.
+
+The rfkill core provides API for kernel drivers to register their radio
+transmitter with the kernel, methods for turning it on and off, and letting
+the system know about hardware-disabled states that may be implemented on
+the device.
+
+The rfkill core code also notifies userspace of state changes, and provides
+ways for userspace to query the current states. See the "Userspace support"
+section below.
+
+When the device is hard-blocked (either by a call to rfkill_set_hw_state()
+or from query_hw_block), set_block() will be invoked for additional software
+block, but drivers can ignore the method call since they can use the return
+value of the function rfkill_set_hw_state() to sync the software state
+instead of keeping track of calls to set_block(). In fact, drivers should
+use the return value of rfkill_set_hw_state() unless the hardware actually
+keeps track of soft and hard block separately.
+
+
+Kernel API
+==========
+
+Drivers for radio transmitters normally implement an rfkill driver.
+
+Platform drivers might implement input devices if the rfkill button is just
+that, a button. If that button influences the hardware then you need to
+implement an rfkill driver instead. This also applies if the platform provides
+a way to turn on/off the transmitter(s).
+
+For some platforms, it is possible that the hardware state changes during
+suspend/hibernation, in which case it will be necessary to update the rfkill
+core with the current state at resume time.
+
+To create an rfkill driver, driver's Kconfig needs to have::
+
+ depends on RFKILL || !RFKILL
+
+to ensure the driver cannot be built-in when rfkill is modular. The !RFKILL
+case allows the driver to be built when rfkill is not configured, in which
+case all rfkill API can still be used but will be provided by static inlines
+which compile to almost nothing.
+
+Calling rfkill_set_hw_state() when a state change happens is required from
+rfkill drivers that control devices that can be hard-blocked unless they also
+assign the poll_hw_block() callback (then the rfkill core will poll the
+device). Don't do this unless you cannot get the event in any other way.
+
+rfkill provides per-switch LED triggers, which can be used to drive LEDs
+according to the switch state (LED_FULL when blocked, LED_OFF otherwise).
+
+
+Userspace support
+=================
+
+The recommended userspace interface to use is /dev/rfkill, which is a misc
+character device that allows userspace to obtain and set the state of rfkill
+devices and sets of devices. It also notifies userspace about device addition
+and removal. The API is a simple read/write API that is defined in
+linux/rfkill.h, with one ioctl that allows turning off the deprecated input
+handler in the kernel for the transition period.
+
+Except for the one ioctl, communication with the kernel is done via read()
+and write() of instances of 'struct rfkill_event'. In this structure, the
+soft and hard block are properly separated (unlike sysfs, see below) and
+userspace is able to get a consistent snapshot of all rfkill devices in the
+system. Also, it is possible to switch all rfkill drivers (or all drivers of
+a specified type) into a state which also updates the default state for
+hotplugged devices.
+
+After an application opens /dev/rfkill, it can read the current state of all
+devices. Changes can be obtained by either polling the descriptor for
+hotplug or state change events or by listening for uevents emitted by the
+rfkill core framework.
+
+Additionally, each rfkill device is registered in sysfs and emits uevents.
+
+rfkill devices issue uevents (with an action of "change"), with the following
+environment variables set::
+
+ RFKILL_NAME
+ RFKILL_STATE
+ RFKILL_TYPE
+
+The content of these variables corresponds to the "name", "state" and
+"type" sysfs files explained above.
+
+For further details consult Documentation/ABI/stable/sysfs-class-rfkill.
diff --git a/Documentation/driver-api/s390-drivers.rst b/Documentation/driver-api/s390-drivers.rst
new file mode 100644
index 0000000000..8c0845c4ee
--- /dev/null
+++ b/Documentation/driver-api/s390-drivers.rst
@@ -0,0 +1,135 @@
+===================================
+Writing s390 channel device drivers
+===================================
+
+:Author: Cornelia Huck
+
+Introduction
+============
+
+This document describes the interfaces available for device drivers that
+drive s390 based channel attached I/O devices. This includes interfaces
+for interaction with the hardware and interfaces for interacting with
+the common driver core. Those interfaces are provided by the s390 common
+I/O layer.
+
+The document assumes a familarity with the technical terms associated
+with the s390 channel I/O architecture. For a description of this
+architecture, please refer to the "z/Architecture: Principles of
+Operation", IBM publication no. SA22-7832.
+
+While most I/O devices on a s390 system are typically driven through the
+channel I/O mechanism described here, there are various other methods
+(like the diag interface). These are out of the scope of this document.
+
+The s390 common I/O layer also provides access to some devices that are
+not strictly considered I/O devices. They are considered here as well,
+although they are not the focus of this document.
+
+Some additional information can also be found in the kernel source under
+Documentation/arch/s390/driver-model.rst.
+
+The css bus
+===========
+
+The css bus contains the subchannels available on the system. They fall
+into several categories:
+
+* Standard I/O subchannels, for use by the system. They have a child
+ device on the ccw bus and are described below.
+* I/O subchannels bound to the vfio-ccw driver. See
+ Documentation/arch/s390/vfio-ccw.rst.
+* Message subchannels. No Linux driver currently exists.
+* CHSC subchannels (at most one). The chsc subchannel driver can be used
+ to send asynchronous chsc commands.
+* eADM subchannels. Used for talking to storage class memory.
+
+The ccw bus
+===========
+
+The ccw bus typically contains the majority of devices available to a
+s390 system. Named after the channel command word (ccw), the basic
+command structure used to address its devices, the ccw bus contains
+so-called channel attached devices. They are addressed via I/O
+subchannels, visible on the css bus. A device driver for
+channel-attached devices, however, will never interact with the
+subchannel directly, but only via the I/O device on the ccw bus, the ccw
+device.
+
+I/O functions for channel-attached devices
+------------------------------------------
+
+Some hardware structures have been translated into C structures for use
+by the common I/O layer and device drivers. For more information on the
+hardware structures represented here, please consult the Principles of
+Operation.
+
+.. kernel-doc:: arch/s390/include/asm/cio.h
+ :internal:
+
+ccw devices
+-----------
+
+Devices that want to initiate channel I/O need to attach to the ccw bus.
+Interaction with the driver core is done via the common I/O layer, which
+provides the abstractions of ccw devices and ccw device drivers.
+
+The functions that initiate or terminate channel I/O all act upon a ccw
+device structure. Device drivers must not bypass those functions or
+strange side effects may happen.
+
+.. kernel-doc:: arch/s390/include/asm/ccwdev.h
+ :internal:
+
+.. kernel-doc:: drivers/s390/cio/device.c
+ :export:
+
+.. kernel-doc:: drivers/s390/cio/device_ops.c
+ :export:
+
+The channel-measurement facility
+--------------------------------
+
+The channel-measurement facility provides a means to collect measurement
+data which is made available by the channel subsystem for each channel
+attached device.
+
+.. kernel-doc:: arch/s390/include/uapi/asm/cmb.h
+ :internal:
+
+.. kernel-doc:: drivers/s390/cio/cmf.c
+ :export:
+
+The ccwgroup bus
+================
+
+The ccwgroup bus only contains artificial devices, created by the user.
+Many networking devices (e.g. qeth) are in fact composed of several ccw
+devices (like read, write and data channel for qeth). The ccwgroup bus
+provides a mechanism to create a meta-device which contains those ccw
+devices as slave devices and can be associated with the netdevice.
+
+ccw group devices
+-----------------
+
+.. kernel-doc:: arch/s390/include/asm/ccwgroup.h
+ :internal:
+
+.. kernel-doc:: drivers/s390/cio/ccwgroup.c
+ :export:
+
+Generic interfaces
+==================
+
+The following section contains interfaces in use not only by drivers
+dealing with ccw devices, but drivers for various other s390 hardware
+as well.
+
+Adapter interrupts
+------------------
+
+The common I/O layer provides helper functions for dealing with adapter
+interrupts and interrupt vectors.
+
+.. kernel-doc:: drivers/s390/cio/airq.c
+ :export:
diff --git a/Documentation/driver-api/scsi.rst b/Documentation/driver-api/scsi.rst
new file mode 100644
index 0000000000..64b231d125
--- /dev/null
+++ b/Documentation/driver-api/scsi.rst
@@ -0,0 +1,338 @@
+=====================
+SCSI Interfaces Guide
+=====================
+
+:Author: James Bottomley
+:Author: Rob Landley
+
+Introduction
+============
+
+Protocol vs bus
+---------------
+
+Once upon a time, the Small Computer Systems Interface defined both a
+parallel I/O bus and a data protocol to connect a wide variety of
+peripherals (disk drives, tape drives, modems, printers, scanners,
+optical drives, test equipment, and medical devices) to a host computer.
+
+Although the old parallel (fast/wide/ultra) SCSI bus has largely fallen
+out of use, the SCSI command set is more widely used than ever to
+communicate with devices over a number of different busses.
+
+The `SCSI protocol <http://www.t10.org/scsi-3.htm>`__ is a big-endian
+peer-to-peer packet based protocol. SCSI commands are 6, 10, 12, or 16
+bytes long, often followed by an associated data payload.
+
+SCSI commands can be transported over just about any kind of bus, and
+are the default protocol for storage devices attached to USB, SATA, SAS,
+Fibre Channel, FireWire, and ATAPI devices. SCSI packets are also
+commonly exchanged over Infiniband,
+`I2O <http://i2o.shadowconnect.com/faq.php>`__, TCP/IP
+(`iSCSI <https://en.wikipedia.org/wiki/ISCSI>`__), even `Parallel
+ports <http://cyberelk.net/tim/parport/parscsi.html>`__.
+
+Design of the Linux SCSI subsystem
+----------------------------------
+
+The SCSI subsystem uses a three layer design, with upper, mid, and low
+layers. Every operation involving the SCSI subsystem (such as reading a
+sector from a disk) uses one driver at each of the 3 levels: one upper
+layer driver, one lower layer driver, and the SCSI midlayer.
+
+The SCSI upper layer provides the interface between userspace and the
+kernel, in the form of block and char device nodes for I/O and ioctl().
+The SCSI lower layer contains drivers for specific hardware devices.
+
+In between is the SCSI mid-layer, analogous to a network routing layer
+such as the IPv4 stack. The SCSI mid-layer routes a packet based data
+protocol between the upper layer's /dev nodes and the corresponding
+devices in the lower layer. It manages command queues, provides error
+handling and power management functions, and responds to ioctl()
+requests.
+
+SCSI upper layer
+================
+
+The upper layer supports the user-kernel interface by providing device
+nodes.
+
+sd (SCSI Disk)
+--------------
+
+sd (sd_mod.o)
+
+sr (SCSI CD-ROM)
+----------------
+
+sr (sr_mod.o)
+
+st (SCSI Tape)
+--------------
+
+st (st.o)
+
+sg (SCSI Generic)
+-----------------
+
+sg (sg.o)
+
+ch (SCSI Media Changer)
+-----------------------
+
+ch (ch.c)
+
+SCSI mid layer
+==============
+
+SCSI midlayer implementation
+----------------------------
+
+include/scsi/scsi_device.h
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/scsi/scsi_device.h
+ :internal:
+
+drivers/scsi/scsi.c
+~~~~~~~~~~~~~~~~~~~
+
+Main file for the SCSI midlayer.
+
+.. kernel-doc:: drivers/scsi/scsi.c
+ :export:
+
+drivers/scsi/scsicam.c
+~~~~~~~~~~~~~~~~~~~~~~
+
+`SCSI Common Access
+Method <http://www.t10.org/ftp/t10/drafts/cam/cam-r12b.pdf>`__ support
+functions, for use with HDIO_GETGEO, etc.
+
+.. kernel-doc:: drivers/scsi/scsicam.c
+ :export:
+
+drivers/scsi/scsi_error.c
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Common SCSI error/timeout handling routines.
+
+.. kernel-doc:: drivers/scsi/scsi_error.c
+ :export:
+
+drivers/scsi/scsi_devinfo.c
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Manage scsi_dev_info_list, which tracks blacklisted and whitelisted
+devices.
+
+.. kernel-doc:: drivers/scsi/scsi_devinfo.c
+ :internal:
+
+drivers/scsi/scsi_ioctl.c
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Handle ioctl() calls for SCSI devices.
+
+.. kernel-doc:: drivers/scsi/scsi_ioctl.c
+ :export:
+
+drivers/scsi/scsi_lib.c
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+SCSI queuing library.
+
+.. kernel-doc:: drivers/scsi/scsi_lib.c
+ :export:
+
+drivers/scsi/scsi_lib_dma.c
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+SCSI library functions depending on DMA (map and unmap scatter-gather
+lists).
+
+.. kernel-doc:: drivers/scsi/scsi_lib_dma.c
+ :export:
+
+drivers/scsi/scsi_proc.c
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The functions in this file provide an interface between the PROC file
+system and the SCSI device drivers It is mainly used for debugging,
+statistics and to pass information directly to the lowlevel driver. I.E.
+plumbing to manage /proc/scsi/\*
+
+.. kernel-doc:: drivers/scsi/scsi_proc.c
+ :internal:
+
+drivers/scsi/scsi_netlink.c
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Infrastructure to provide async events from transports to userspace via
+netlink, using a single NETLINK_SCSITRANSPORT protocol for all
+transports. See `the original patch
+submission <http://marc.info/?l=linux-scsi&m=115507374832500&w=2>`__ for
+more details.
+
+.. kernel-doc:: drivers/scsi/scsi_netlink.c
+ :internal:
+
+drivers/scsi/scsi_scan.c
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Scan a host to determine which (if any) devices are attached. The
+general scanning/probing algorithm is as follows, exceptions are made to
+it depending on device specific flags, compilation options, and global
+variable (boot or module load time) settings. A specific LUN is scanned
+via an INQUIRY command; if the LUN has a device attached, a scsi_device
+is allocated and setup for it. For every id of every channel on the
+given host, start by scanning LUN 0. Skip hosts that don't respond at
+all to a scan of LUN 0. Otherwise, if LUN 0 has a device attached,
+allocate and setup a scsi_device for it. If target is SCSI-3 or up,
+issue a REPORT LUN, and scan all of the LUNs returned by the REPORT LUN;
+else, sequentially scan LUNs up until some maximum is reached, or a LUN
+is seen that cannot have a device attached to it.
+
+.. kernel-doc:: drivers/scsi/scsi_scan.c
+ :internal:
+
+drivers/scsi/scsi_sysctl.c
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Set up the sysctl entry: "/dev/scsi/logging_level"
+(DEV_SCSI_LOGGING_LEVEL) which sets/returns scsi_logging_level.
+
+drivers/scsi/scsi_sysfs.c
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+SCSI sysfs interface routines.
+
+.. kernel-doc:: drivers/scsi/scsi_sysfs.c
+ :export:
+
+drivers/scsi/hosts.c
+~~~~~~~~~~~~~~~~~~~~
+
+mid to lowlevel SCSI driver interface
+
+.. kernel-doc:: drivers/scsi/hosts.c
+ :export:
+
+drivers/scsi/scsi_common.c
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+general support functions
+
+.. kernel-doc:: drivers/scsi/scsi_common.c
+ :export:
+
+Transport classes
+-----------------
+
+Transport classes are service libraries for drivers in the SCSI lower
+layer, which expose transport attributes in sysfs.
+
+Fibre Channel transport
+~~~~~~~~~~~~~~~~~~~~~~~
+
+The file drivers/scsi/scsi_transport_fc.c defines transport attributes
+for Fibre Channel.
+
+.. kernel-doc:: drivers/scsi/scsi_transport_fc.c
+ :export:
+
+iSCSI transport class
+~~~~~~~~~~~~~~~~~~~~~
+
+The file drivers/scsi/scsi_transport_iscsi.c defines transport
+attributes for the iSCSI class, which sends SCSI packets over TCP/IP
+connections.
+
+.. kernel-doc:: drivers/scsi/scsi_transport_iscsi.c
+ :export:
+
+Serial Attached SCSI (SAS) transport class
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The file drivers/scsi/scsi_transport_sas.c defines transport
+attributes for Serial Attached SCSI, a variant of SATA aimed at large
+high-end systems.
+
+The SAS transport class contains common code to deal with SAS HBAs, an
+aproximated representation of SAS topologies in the driver model, and
+various sysfs attributes to expose these topologies and management
+interfaces to userspace.
+
+In addition to the basic SCSI core objects this transport class
+introduces two additional intermediate objects: The SAS PHY as
+represented by struct sas_phy defines an "outgoing" PHY on a SAS HBA or
+Expander, and the SAS remote PHY represented by struct sas_rphy defines
+an "incoming" PHY on a SAS Expander or end device. Note that this is
+purely a software concept, the underlying hardware for a PHY and a
+remote PHY is the exactly the same.
+
+There is no concept of a SAS port in this code, users can see what PHYs
+form a wide port based on the port_identifier attribute, which is the
+same for all PHYs in a port.
+
+.. kernel-doc:: drivers/scsi/scsi_transport_sas.c
+ :export:
+
+SATA transport class
+~~~~~~~~~~~~~~~~~~~~
+
+The SATA transport is handled by libata, which has its own book of
+documentation in this directory.
+
+Parallel SCSI (SPI) transport class
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The file drivers/scsi/scsi_transport_spi.c defines transport
+attributes for traditional (fast/wide/ultra) SCSI busses.
+
+.. kernel-doc:: drivers/scsi/scsi_transport_spi.c
+ :export:
+
+SCSI RDMA (SRP) transport class
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The file drivers/scsi/scsi_transport_srp.c defines transport
+attributes for SCSI over Remote Direct Memory Access.
+
+.. kernel-doc:: drivers/scsi/scsi_transport_srp.c
+ :export:
+
+SCSI lower layer
+================
+
+Host Bus Adapter transport types
+--------------------------------
+
+Many modern device controllers use the SCSI command set as a protocol to
+communicate with their devices through many different types of physical
+connections.
+
+In SCSI language a bus capable of carrying SCSI commands is called a
+"transport", and a controller connecting to such a bus is called a "host
+bus adapter" (HBA).
+
+Debug transport
+~~~~~~~~~~~~~~~
+
+The file drivers/scsi/scsi_debug.c simulates a host adapter with a
+variable number of disks (or disk like devices) attached, sharing a
+common amount of RAM. Does a lot of checking to make sure that we are
+not getting blocks mixed up, and panics the kernel if anything out of
+the ordinary is seen.
+
+To be more realistic, the simulated devices have the transport
+attributes of SAS disks.
+
+For documentation see http://sg.danny.cz/sg/sdebug26.html
+
+todo
+~~~~
+
+Parallel (fast/wide/ultra) SCSI, USB, SATA, SAS, Fibre Channel,
+FireWire, ATAPI devices, Infiniband, I2O, Parallel ports,
+netlink...
diff --git a/Documentation/driver-api/serial/driver.rst b/Documentation/driver-api/serial/driver.rst
new file mode 100644
index 0000000000..84b43061c1
--- /dev/null
+++ b/Documentation/driver-api/serial/driver.rst
@@ -0,0 +1,106 @@
+====================
+Low Level Serial API
+====================
+
+
+This document is meant as a brief overview of some aspects of the new serial
+driver. It is not complete, any questions you have should be directed to
+<rmk@arm.linux.org.uk>
+
+The reference implementation is contained within amba-pl011.c.
+
+
+
+Low Level Serial Hardware Driver
+--------------------------------
+
+The low level serial hardware driver is responsible for supplying port
+information (defined by uart_port) and a set of control methods (defined
+by uart_ops) to the core serial driver. The low level driver is also
+responsible for handling interrupts for the port, and providing any
+console support.
+
+
+Console Support
+---------------
+
+The serial core provides a few helper functions. This includes identifying
+the correct port structure (via uart_get_console()) and decoding command line
+arguments (uart_parse_options()).
+
+There is also a helper function (uart_console_write()) which performs a
+character by character write, translating newlines to CRLF sequences.
+Driver writers are recommended to use this function rather than implementing
+their own version.
+
+
+Locking
+-------
+
+It is the responsibility of the low level hardware driver to perform the
+necessary locking using port->lock. There are some exceptions (which
+are described in the struct uart_ops listing below.)
+
+There are two locks. A per-port spinlock, and an overall semaphore.
+
+From the core driver perspective, the port->lock locks the following
+data::
+
+ port->mctrl
+ port->icount
+ port->state->xmit.head (circ_buf->head)
+ port->state->xmit.tail (circ_buf->tail)
+
+The low level driver is free to use this lock to provide any additional
+locking.
+
+The port_sem semaphore is used to protect against ports being added/
+removed or reconfigured at inappropriate times. Since v2.6.27, this
+semaphore has been the 'mutex' member of the tty_port struct, and
+commonly referred to as the port mutex.
+
+
+uart_ops
+--------
+
+.. kernel-doc:: include/linux/serial_core.h
+ :identifiers: uart_ops
+
+Other functions
+---------------
+
+.. kernel-doc:: drivers/tty/serial/serial_core.c
+ :identifiers: uart_update_timeout uart_get_baud_rate uart_get_divisor
+ uart_match_port uart_write_wakeup uart_register_driver
+ uart_unregister_driver uart_suspend_port uart_resume_port
+ uart_add_one_port uart_remove_one_port uart_console_write
+ uart_parse_earlycon uart_parse_options uart_set_options
+ uart_get_lsr_info uart_handle_dcd_change uart_handle_cts_change
+ uart_try_toggle_sysrq uart_get_console
+
+.. kernel-doc:: include/linux/serial_core.h
+ :identifiers: uart_port_tx_limited uart_port_tx
+
+Other notes
+-----------
+
+It is intended some day to drop the 'unused' entries from uart_port, and
+allow low level drivers to register their own individual uart_port's with
+the core. This will allow drivers to use uart_port as a pointer to a
+structure containing both the uart_port entry with their own extensions,
+thus::
+
+ struct my_port {
+ struct uart_port port;
+ int my_stuff;
+ };
+
+Modem control lines via GPIO
+----------------------------
+
+Some helpers are provided in order to set/get modem control lines via GPIO.
+
+.. kernel-doc:: drivers/tty/serial/serial_mctrl_gpio.c
+ :identifiers: mctrl_gpio_init mctrl_gpio_free mctrl_gpio_to_gpiod
+ mctrl_gpio_set mctrl_gpio_get mctrl_gpio_enable_ms
+ mctrl_gpio_disable_ms
diff --git a/Documentation/driver-api/serial/index.rst b/Documentation/driver-api/serial/index.rst
new file mode 100644
index 0000000000..03a55b987a
--- /dev/null
+++ b/Documentation/driver-api/serial/index.rst
@@ -0,0 +1,27 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==========================
+Support for Serial devices
+==========================
+
+.. toctree::
+ :maxdepth: 1
+
+
+ driver
+
+Serial drivers
+==============
+
+.. toctree::
+ :maxdepth: 1
+
+ serial-iso7816
+ serial-rs485
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/serial/serial-iso7816.rst b/Documentation/driver-api/serial/serial-iso7816.rst
new file mode 100644
index 0000000000..d990143de0
--- /dev/null
+++ b/Documentation/driver-api/serial/serial-iso7816.rst
@@ -0,0 +1,90 @@
+=============================
+ISO7816 Serial Communications
+=============================
+
+1. Introduction
+===============
+
+ ISO/IEC7816 is a series of standards specifying integrated circuit cards (ICC)
+ also known as smart cards.
+
+2. Hardware-related considerations
+==================================
+
+ Some CPUs/UARTs (e.g., Microchip AT91) contain a built-in mode capable of
+ handling communication with a smart card.
+
+ For these microcontrollers, the Linux driver should be made capable of
+ working in both modes, and proper ioctls (see later) should be made
+ available at user-level to allow switching from one mode to the other, and
+ vice versa.
+
+3. Data Structures Already Available in the Kernel
+==================================================
+
+ The Linux kernel provides the serial_iso7816 structure (see [1]) to handle
+ ISO7816 communications. This data structure is used to set and configure
+ ISO7816 parameters in ioctls.
+
+ Any driver for devices capable of working both as RS232 and ISO7816 should
+ implement the iso7816_config callback in the uart_port structure. The
+ serial_core calls iso7816_config to do the device specific part in response
+ to TIOCGISO7816 and TIOCSISO7816 ioctls (see below). The iso7816_config
+ callback receives a pointer to struct serial_iso7816.
+
+4. Usage from user-level
+========================
+
+ From user-level, ISO7816 configuration can be get/set using the previous
+ ioctls. For instance, to set ISO7816 you can use the following code::
+
+ #include <linux/serial.h>
+
+ /* Include definition for ISO7816 ioctls: TIOCSISO7816 and TIOCGISO7816 */
+ #include <sys/ioctl.h>
+
+ /* Open your specific device (e.g., /dev/mydevice): */
+ int fd = open ("/dev/mydevice", O_RDWR);
+ if (fd < 0) {
+ /* Error handling. See errno. */
+ }
+
+ struct serial_iso7816 iso7816conf;
+
+ /* Reserved fields as to be zeroed */
+ memset(&iso7816conf, 0, sizeof(iso7816conf));
+
+ /* Enable ISO7816 mode: */
+ iso7816conf.flags |= SER_ISO7816_ENABLED;
+
+ /* Select the protocol: */
+ /* T=0 */
+ iso7816conf.flags |= SER_ISO7816_T(0);
+ /* or T=1 */
+ iso7816conf.flags |= SER_ISO7816_T(1);
+
+ /* Set the guard time: */
+ iso7816conf.tg = 2;
+
+ /* Set the clock frequency*/
+ iso7816conf.clk = 3571200;
+
+ /* Set transmission factors: */
+ iso7816conf.sc_fi = 372;
+ iso7816conf.sc_di = 1;
+
+ if (ioctl(fd_usart, TIOCSISO7816, &iso7816conf) < 0) {
+ /* Error handling. See errno. */
+ }
+
+ /* Use read() and write() syscalls here... */
+
+ /* Close the device when finished: */
+ if (close (fd) < 0) {
+ /* Error handling. See errno. */
+ }
+
+5. References
+=============
+
+ [1] include/uapi/linux/serial.h
diff --git a/Documentation/driver-api/serial/serial-rs485.rst b/Documentation/driver-api/serial/serial-rs485.rst
new file mode 100644
index 0000000000..dce061ef76
--- /dev/null
+++ b/Documentation/driver-api/serial/serial-rs485.rst
@@ -0,0 +1,135 @@
+===========================
+RS485 Serial Communications
+===========================
+
+1. Introduction
+===============
+
+ EIA-485, also known as TIA/EIA-485 or RS-485, is a standard defining the
+ electrical characteristics of drivers and receivers for use in balanced
+ digital multipoint systems.
+ This standard is widely used for communications in industrial automation
+ because it can be used effectively over long distances and in electrically
+ noisy environments.
+
+2. Hardware-related Considerations
+==================================
+
+ Some CPUs/UARTs (e.g., Atmel AT91 or 16C950 UART) contain a built-in
+ half-duplex mode capable of automatically controlling line direction by
+ toggling RTS or DTR signals. That can be used to control external
+ half-duplex hardware like an RS485 transceiver or any RS232-connected
+ half-duplex devices like some modems.
+
+ For these microcontrollers, the Linux driver should be made capable of
+ working in both modes, and proper ioctls (see later) should be made
+ available at user-level to allow switching from one mode to the other, and
+ vice versa.
+
+3. Data Structures Already Available in the Kernel
+==================================================
+
+ The Linux kernel provides the struct serial_rs485 to handle RS485
+ communications. This data structure is used to set and configure RS485
+ parameters in the platform data and in ioctls.
+
+ The device tree can also provide RS485 boot time parameters
+ [#DT-bindings]_. The serial core fills the struct serial_rs485 from the
+ values given by the device tree when the driver calls
+ uart_get_rs485_mode().
+
+ Any driver for devices capable of working both as RS232 and RS485 should
+ implement the ``rs485_config`` callback and provide ``rs485_supported``
+ in the ``struct uart_port``. The serial core calls ``rs485_config`` to do
+ the device specific part in response to TIOCSRS485 ioctl (see below). The
+ ``rs485_config`` callback receives a pointer to a sanitizated struct
+ serial_rs485. The struct serial_rs485 userspace provides is sanitized
+ before calling ``rs485_config`` using ``rs485_supported`` that indicates
+ what RS485 features the driver supports for the ``struct uart_port``.
+ TIOCGRS485 ioctl can be used to read back the struct serial_rs485
+ matching to the current configuration.
+
+.. kernel-doc:: include/uapi/linux/serial.h
+ :identifiers: serial_rs485 uart_get_rs485_mode
+
+4. Usage from user-level
+========================
+
+ From user-level, RS485 configuration can be get/set using the previous
+ ioctls. For instance, to set RS485 you can use the following code::
+
+ #include <linux/serial.h>
+
+ /* Include definition for RS485 ioctls: TIOCGRS485 and TIOCSRS485 */
+ #include <sys/ioctl.h>
+
+ /* Open your specific device (e.g., /dev/mydevice): */
+ int fd = open ("/dev/mydevice", O_RDWR);
+ if (fd < 0) {
+ /* Error handling. See errno. */
+ }
+
+ struct serial_rs485 rs485conf;
+
+ /* Enable RS485 mode: */
+ rs485conf.flags |= SER_RS485_ENABLED;
+
+ /* Set logical level for RTS pin equal to 1 when sending: */
+ rs485conf.flags |= SER_RS485_RTS_ON_SEND;
+ /* or, set logical level for RTS pin equal to 0 when sending: */
+ rs485conf.flags &= ~(SER_RS485_RTS_ON_SEND);
+
+ /* Set logical level for RTS pin equal to 1 after sending: */
+ rs485conf.flags |= SER_RS485_RTS_AFTER_SEND;
+ /* or, set logical level for RTS pin equal to 0 after sending: */
+ rs485conf.flags &= ~(SER_RS485_RTS_AFTER_SEND);
+
+ /* Set rts delay before send, if needed: */
+ rs485conf.delay_rts_before_send = ...;
+
+ /* Set rts delay after send, if needed: */
+ rs485conf.delay_rts_after_send = ...;
+
+ /* Set this flag if you want to receive data even while sending data */
+ rs485conf.flags |= SER_RS485_RX_DURING_TX;
+
+ if (ioctl (fd, TIOCSRS485, &rs485conf) < 0) {
+ /* Error handling. See errno. */
+ }
+
+ /* Use read() and write() syscalls here... */
+
+ /* Close the device when finished: */
+ if (close (fd) < 0) {
+ /* Error handling. See errno. */
+ }
+
+5. Multipoint Addressing
+========================
+
+ The Linux kernel provides addressing mode for multipoint RS-485 serial
+ communications line. The addressing mode is enabled with
+ ``SER_RS485_ADDRB`` flag in struct serial_rs485. The struct serial_rs485
+ has two additional flags and fields for enabling receive and destination
+ addresses.
+
+ Address mode flags:
+ - ``SER_RS485_ADDRB``: Enabled addressing mode (sets also ADDRB in termios).
+ - ``SER_RS485_ADDR_RECV``: Receive (filter) address enabled.
+ - ``SER_RS485_ADDR_DEST``: Set destination address.
+
+ Address fields (enabled with corresponding ``SER_RS485_ADDR_*`` flag):
+ - ``addr_recv``: Receive address.
+ - ``addr_dest``: Destination address.
+
+ Once a receive address is set, the communication can occur only with the
+ particular device and other peers are filtered out. It is left up to the
+ receiver side to enforce the filtering. Receive address will be cleared
+ if ``SER_RS485_ADDR_RECV`` is not set.
+
+ Note: not all devices supporting RS485 support multipoint addressing.
+
+6. References
+=============
+
+.. [#DT-bindings] Documentation/devicetree/bindings/serial/rs485.txt
diff --git a/Documentation/driver-api/slimbus.rst b/Documentation/driver-api/slimbus.rst
new file mode 100644
index 0000000000..410eec79b2
--- /dev/null
+++ b/Documentation/driver-api/slimbus.rst
@@ -0,0 +1,132 @@
+============================
+Linux kernel SLIMbus support
+============================
+
+Overview
+========
+
+What is SLIMbus?
+----------------
+SLIMbus (Serial Low Power Interchip Media Bus) is a specification developed by
+MIPI (Mobile Industry Processor Interface) alliance. The bus uses master/slave
+configuration, and is a 2-wire multi-drop implementation (clock, and data).
+
+Currently, SLIMbus is used to interface between application processors of SoCs
+(System-on-Chip) and peripheral components (typically codec). SLIMbus uses
+Time-Division-Multiplexing to accommodate multiple data channels, and
+a control channel.
+
+The control channel is used for various control functions such as bus
+management, configuration and status updates. These messages can be unicast (e.g.
+reading/writing device specific values), or multicast (e.g. data channel
+reconfiguration sequence is a broadcast message announced to all devices)
+
+A data channel is used for data-transfer between 2 SLIMbus devices. Data
+channel uses dedicated ports on the device.
+
+Hardware description:
+---------------------
+SLIMbus specification has different types of device classifications based on
+their capabilities.
+A manager device is responsible for enumeration, configuration, and dynamic
+channel allocation. Every bus has 1 active manager.
+
+A generic device is a device providing application functionality (e.g. codec).
+
+Framer device is responsible for clocking the bus, and transmitting frame-sync
+and framing information on the bus.
+
+Each SLIMbus component has an interface device for monitoring physical layer.
+
+Typically each SoC contains SLIMbus component having 1 manager, 1 framer device,
+1 generic device (for data channel support), and 1 interface device.
+External peripheral SLIMbus component usually has 1 generic device (for
+functionality/data channel support), and an associated interface device.
+The generic device's registers are mapped as 'value elements' so that they can
+be written/read using SLIMbus control channel exchanging control/status type of
+information.
+In case there are multiple framer devices on the same bus, manager device is
+responsible to select the active-framer for clocking the bus.
+
+Per specification, SLIMbus uses "clock gears" to do power management based on
+current frequency and bandwidth requirements. There are 10 clock gears and each
+gear changes the SLIMbus frequency to be twice its previous gear.
+
+Each device has a 6-byte enumeration-address and the manager assigns every
+device with a 1-byte logical address after the devices report presence on the
+bus.
+
+Software description:
+---------------------
+There are 2 types of SLIMbus drivers:
+
+slim_controller represents a 'controller' for SLIMbus. This driver should
+implement duties needed by the SoC (manager device, associated
+interface device for monitoring the layers and reporting errors, default
+framer device).
+
+slim_device represents the 'generic device/component' for SLIMbus, and a
+slim_driver should implement driver for that slim_device.
+
+Device notifications to the driver:
+-----------------------------------
+Since SLIMbus devices have mechanisms for reporting their presence, the
+framework allows drivers to bind when corresponding devices report their
+presence on the bus.
+However, it is possible that the driver needs to be probed
+first so that it can enable corresponding SLIMbus device (e.g. power it up and/or
+take it out of reset). To support that behavior, the framework allows drivers
+to probe first as well (e.g. using standard DeviceTree compatibility field).
+This creates the necessity for the driver to know when the device is functional
+(i.e. reported present). device_up callback is used for that reason when the
+device reports present and is assigned a logical address by the controller.
+
+Similarly, SLIMbus devices 'report absent' when they go down. A 'device_down'
+callback notifies the driver when the device reports absent and its logical
+address assignment is invalidated by the controller.
+
+Another notification "boot_device" is used to notify the slim_driver when
+controller resets the bus. This notification allows the driver to take necessary
+steps to boot the device so that it's functional after the bus has been reset.
+
+Driver and Controller APIs:
+---------------------------
+.. kernel-doc:: include/linux/slimbus.h
+ :internal:
+
+.. kernel-doc:: drivers/slimbus/slimbus.h
+ :internal:
+
+.. kernel-doc:: drivers/slimbus/core.c
+ :export:
+
+Clock-pause:
+------------
+SLIMbus mandates that a reconfiguration sequence (known as clock-pause) be
+broadcast to all active devices on the bus before the bus can enter low-power
+mode. Controller uses this sequence when it decides to enter low-power mode so
+that corresponding clocks and/or power-rails can be turned off to save power.
+Clock-pause is exited by waking up framer device (if controller driver initiates
+exiting low power mode), or by toggling the data line (if a slave device wants
+to initiate it).
+
+Clock-pause APIs:
+~~~~~~~~~~~~~~~~~
+.. kernel-doc:: drivers/slimbus/sched.c
+ :export:
+
+Messaging:
+----------
+The framework supports regmap and read/write apis to exchange control-information
+with a SLIMbus device. APIs can be synchronous or asynchronous.
+The header file <linux/slimbus.h> has more documentation about messaging APIs.
+
+Messaging APIs:
+~~~~~~~~~~~~~~~
+.. kernel-doc:: drivers/slimbus/messaging.c
+ :export:
+
+Streaming APIs:
+~~~~~~~~~~~~~~~
+.. kernel-doc:: drivers/slimbus/stream.c
+ :export:
diff --git a/Documentation/driver-api/sm501.rst b/Documentation/driver-api/sm501.rst
new file mode 100644
index 0000000000..882507453b
--- /dev/null
+++ b/Documentation/driver-api/sm501.rst
@@ -0,0 +1,74 @@
+.. include:: <isonum.txt>
+
+============
+SM501 Driver
+============
+
+:Copyright: |copy| 2006, 2007 Simtec Electronics
+
+The Silicon Motion SM501 multimedia companion chip is a multifunction device
+which may provide numerous interfaces including USB host controller USB gadget,
+asynchronous serial ports, audio functions, and a dual display video interface.
+The device may be connected by PCI or local bus with varying functions enabled.
+
+Core
+----
+
+The core driver in drivers/mfd provides common services for the
+drivers which manage the specific hardware blocks. These services
+include locking for common registers, clock control and resource
+management.
+
+The core registers drivers for both PCI and generic bus based
+chips via the platform device and driver system.
+
+On detection of a device, the core initialises the chip (which may
+be specified by the platform data) and then exports the selected
+peripheral set as platform devices for the specific drivers.
+
+The core re-uses the platform device system as the platform device
+system provides enough features to support the drivers without the
+need to create a new bus-type and the associated code to go with it.
+
+
+Resources
+---------
+
+Each peripheral has a view of the device which is implicitly narrowed to
+the specific set of resources that peripheral requires in order to
+function correctly.
+
+The centralised memory allocation allows the driver to ensure that the
+maximum possible resource allocation can be made to the video subsystem
+as this is by-far the most resource-sensitive of the on-chip functions.
+
+The primary issue with memory allocation is that of moving the video
+buffers once a display mode is chosen. Indeed when a video mode change
+occurs the memory footprint of the video subsystem changes.
+
+Since video memory is difficult to move without changing the display
+(unless sufficient contiguous memory can be provided for the old and new
+modes simultaneously) the video driver fully utilises the memory area
+given to it by aligning fb0 to the start of the area and fb1 to the end
+of it. Any memory left over in the middle is used for the acceleration
+functions, which are transient and thus their location is less critical
+as it can be moved.
+
+
+Configuration
+-------------
+
+The platform device driver uses a set of platform data to pass
+configurations through to the core and the subsidiary drivers
+so that there can be support for more than one system carrying
+an SM501 built into a single kernel image.
+
+The PCI driver assumes that the PCI card behaves as per the Silicon
+Motion reference design.
+
+There is an errata (AB-5) affecting the selection of the
+of the M1XCLK and M1CLK frequencies. These two clocks
+must be sourced from the same PLL, although they can then
+be divided down individually. If this is not set, then SM501 may
+lock and hang the whole system. The driver will refuse to
+attach if the PLL selection is different.
diff --git a/Documentation/driver-api/soundwire/error_handling.rst b/Documentation/driver-api/soundwire/error_handling.rst
new file mode 100644
index 0000000000..aa3a0a23a0
--- /dev/null
+++ b/Documentation/driver-api/soundwire/error_handling.rst
@@ -0,0 +1,65 @@
+========================
+SoundWire Error Handling
+========================
+
+The SoundWire PHY was designed with care and errors on the bus are going to
+be very unlikely, and if they happen it should be limited to single bit
+errors. Examples of this design can be found in the synchronization
+mechanism (sync loss after two errors) and short CRCs used for the Bulk
+Register Access.
+
+The errors can be detected with multiple mechanisms:
+
+1. Bus clash or parity errors: This mechanism relies on low-level detectors
+ that are independent of the payload and usages, and they cover both control
+ and audio data. The current implementation only logs such errors.
+ Improvements could be invalidating an entire programming sequence and
+ restarting from a known position. In the case of such errors outside of a
+ control/command sequence, there is no concealment or recovery for audio
+ data enabled by the SoundWire protocol, the location of the error will also
+ impact its audibility (most-significant bits will be more impacted in PCM),
+ and after a number of such errors are detected the bus might be reset. Note
+ that bus clashes due to programming errors (two streams using the same bit
+ slots) or electrical issues during the transmit/receive transition cannot
+ be distinguished, although a recurring bus clash when audio is enabled is a
+ indication of a bus allocation issue. The interrupt mechanism can also help
+ identify Slaves which detected a Bus Clash or a Parity Error, but they may
+ not be responsible for the errors so resetting them individually is not a
+ viable recovery strategy.
+
+2. Command status: Each command is associated with a status, which only
+ covers transmission of the data between devices. The ACK status indicates
+ that the command was received and will be executed by the end of the
+ current frame. A NAK indicates that the command was in error and will not
+ be applied. In case of a bad programming (command sent to non-existent
+ Slave or to a non-implemented register) or electrical issue, no response
+ signals the command was ignored. Some Master implementations allow for a
+ command to be retransmitted several times. If the retransmission fails,
+ backtracking and restarting the entire programming sequence might be a
+ solution. Alternatively some implementations might directly issue a bus
+ reset and re-enumerate all devices.
+
+3. Timeouts: In a number of cases such as ChannelPrepare or
+ ClockStopPrepare, the bus driver is supposed to poll a register field until
+ it transitions to a NotFinished value of zero. The MIPI SoundWire spec 1.1
+ does not define timeouts but the MIPI SoundWire DisCo document adds
+ recommendation on timeouts. If such configurations do not complete, the
+ driver will return a -ETIMEOUT. Such timeouts are symptoms of a faulty
+ Slave device and are likely impossible to recover from.
+
+Errors during global reconfiguration sequences are extremely difficult to
+handle:
+
+1. BankSwitch: An error during the last command issuing a BankSwitch is
+ difficult to backtrack from. Retransmitting the Bank Switch command may be
+ possible in a single segment setup, but this can lead to synchronization
+ problems when enabling multiple bus segments (a command with side effects
+ such as frame reconfiguration would be handled at different times). A global
+ hard-reset might be the best solution.
+
+Note that SoundWire does not provide a mechanism to detect illegal values
+written in valid registers. In a number of cases the standard even mentions
+that the Slave might behave in implementation-defined ways. The bus
+implementation does not provide a recovery mechanism for such errors, Slave
+or Master driver implementers are responsible for writing valid values in
+valid registers and implement additional range checking if needed.
diff --git a/Documentation/driver-api/soundwire/index.rst b/Documentation/driver-api/soundwire/index.rst
new file mode 100644
index 0000000000..234911a0db
--- /dev/null
+++ b/Documentation/driver-api/soundwire/index.rst
@@ -0,0 +1,18 @@
+=======================
+SoundWire Documentation
+=======================
+
+.. toctree::
+ :maxdepth: 1
+
+ summary
+ stream
+ error_handling
+ locking
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/soundwire/locking.rst b/Documentation/driver-api/soundwire/locking.rst
new file mode 100644
index 0000000000..3a7ffb3d87
--- /dev/null
+++ b/Documentation/driver-api/soundwire/locking.rst
@@ -0,0 +1,108 @@
+=================
+SoundWire Locking
+=================
+
+This document explains locking mechanism of the SoundWire Bus. Bus uses
+following locks in order to avoid race conditions in Bus operations on
+shared resources.
+
+ - Bus lock
+
+ - Message lock
+
+Bus lock
+========
+
+SoundWire Bus lock is a mutex and is part of Bus data structure
+(sdw_bus) which is used for every Bus instance. This lock is used to
+serialize each of the following operations(s) within SoundWire Bus instance.
+
+ - Addition and removal of Slave(s), changing Slave status.
+
+ - Prepare, Enable, Disable and De-prepare stream operations.
+
+ - Access of Stream data structure.
+
+Message lock
+============
+
+SoundWire message transfer lock. This mutex is part of
+Bus data structure (sdw_bus). This lock is used to serialize the message
+transfers (read/write) within a SoundWire Bus instance.
+
+Below examples show how locks are acquired.
+
+Example 1
+---------
+
+Message transfer.
+
+ 1. For every message transfer
+
+ a. Acquire Message lock.
+
+ b. Transfer message (Read/Write) to Slave1 or broadcast message on
+ Bus in case of bank switch.
+
+ c. Release Message lock
+
+ ::
+
+ +----------+ +---------+
+ | | | |
+ | Bus | | Master |
+ | | | Driver |
+ | | | |
+ +----+-----+ +----+----+
+ | |
+ | bus->ops->xfer_msg() |
+ <-------------------------------+ a. Acquire Message lock
+ | | b. Transfer message
+ | |
+ +-------------------------------> c. Release Message lock
+ | return success/error | d. Return success/error
+ | |
+ + +
+
+Example 2
+---------
+
+Prepare operation.
+
+ 1. Acquire lock for Bus instance associated with Master 1.
+
+ 2. For every message transfer in Prepare operation
+
+ a. Acquire Message lock.
+
+ b. Transfer message (Read/Write) to Slave1 or broadcast message on
+ Bus in case of bank switch.
+
+ c. Release Message lock.
+
+ 3. Release lock for Bus instance associated with Master 1 ::
+
+ +----------+ +---------+
+ | | | |
+ | Bus | | Master |
+ | | | Driver |
+ | | | |
+ +----+-----+ +----+----+
+ | |
+ | sdw_prepare_stream() |
+ <-------------------------------+ 1. Acquire bus lock
+ | | 2. Perform stream prepare
+ | |
+ | |
+ | bus->ops->xfer_msg() |
+ <-------------------------------+ a. Acquire Message lock
+ | | b. Transfer message
+ | |
+ +-------------------------------> c. Release Message lock
+ | return success/error | d. Return success/error
+ | |
+ | |
+ | return success/error | 3. Release bus lock
+ +-------------------------------> 4. Return success/error
+ | |
+ + +
diff --git a/Documentation/driver-api/soundwire/stream.rst b/Documentation/driver-api/soundwire/stream.rst
new file mode 100644
index 0000000000..b432a2de45
--- /dev/null
+++ b/Documentation/driver-api/soundwire/stream.rst
@@ -0,0 +1,527 @@
+=========================
+Audio Stream in SoundWire
+=========================
+
+An audio stream is a logical or virtual connection created between
+
+ (1) System memory buffer(s) and Codec(s)
+
+ (2) DSP memory buffer(s) and Codec(s)
+
+ (3) FIFO(s) and Codec(s)
+
+ (4) Codec(s) and Codec(s)
+
+which is typically driven by a DMA(s) channel through the data link. An
+audio stream contains one or more channels of data. All channels within
+stream must have same sample rate and same sample size.
+
+Assume a stream with two channels (Left & Right) is opened using SoundWire
+interface. Below are some ways a stream can be represented in SoundWire.
+
+Stream Sample in memory (System memory, DSP memory or FIFOs) ::
+
+ -------------------------
+ | L | R | L | R | L | R |
+ -------------------------
+
+Example 1: Stereo Stream with L and R channels is rendered from Master to
+Slave. Both Master and Slave is using single port. ::
+
+ +---------------+ Clock Signal +---------------+
+ | Master +----------------------------------+ Slave |
+ | Interface | | Interface |
+ | | | 1 |
+ | | Data Signal | |
+ | L + R +----------------------------------+ L + R |
+ | (Data) | Data Direction | (Data) |
+ +---------------+ +-----------------------> +---------------+
+
+
+Example 2: Stereo Stream with L and R channels is captured from Slave to
+Master. Both Master and Slave is using single port. ::
+
+
+ +---------------+ Clock Signal +---------------+
+ | Master +----------------------------------+ Slave |
+ | Interface | | Interface |
+ | | | 1 |
+ | | Data Signal | |
+ | L + R +----------------------------------+ L + R |
+ | (Data) | Data Direction | (Data) |
+ +---------------+ <-----------------------+ +---------------+
+
+
+Example 3: Stereo Stream with L and R channels is rendered by Master. Each
+of the L and R channel is received by two different Slaves. Master and both
+Slaves are using single port. ::
+
+ +---------------+ Clock Signal +---------------+
+ | Master +---------+------------------------+ Slave |
+ | Interface | | | Interface |
+ | | | | 1 |
+ | | | Data Signal | |
+ | L + R +---+------------------------------+ L |
+ | (Data) | | | Data Direction | (Data) |
+ +---------------+ | | +-------------> +---------------+
+ | |
+ | |
+ | | +---------------+
+ | +----------------------> | Slave |
+ | | Interface |
+ | | 2 |
+ | | |
+ +----------------------------> | R |
+ | (Data) |
+ +---------------+
+
+Example 4: Stereo Stream with L and R channels is rendered by
+Master. Both of the L and R channels are received by two different
+Slaves. Master and both Slaves are using single port handling
+L+R. Each Slave device processes the L + R data locally, typically
+based on static configuration or dynamic orientation, and may drive
+one or more speakers. ::
+
+ +---------------+ Clock Signal +---------------+
+ | Master +---------+------------------------+ Slave |
+ | Interface | | | Interface |
+ | | | | 1 |
+ | | | Data Signal | |
+ | L + R +---+------------------------------+ L + R |
+ | (Data) | | | Data Direction | (Data) |
+ +---------------+ | | +-------------> +---------------+
+ | |
+ | |
+ | | +---------------+
+ | +----------------------> | Slave |
+ | | Interface |
+ | | 2 |
+ | | |
+ +----------------------------> | L + R |
+ | (Data) |
+ +---------------+
+
+Example 5: Stereo Stream with L and R channel is rendered by two different
+Ports of the Master and is received by only single Port of the Slave
+interface. ::
+
+ +--------------------+
+ | |
+ | +--------------+ +----------------+
+ | | || | |
+ | | Data Port || L Channel | |
+ | | 1 |------------+ | |
+ | | L Channel || | +-----+----+ |
+ | | (Data) || | L + R Channel || Data | |
+ | Master +----------+ | +---+---------> || Port | |
+ | Interface | | || 1 | |
+ | +--------------+ | || | |
+ | | || | +----------+ |
+ | | Data Port |------------+ | |
+ | | 2 || R Channel | Slave |
+ | | R Channel || | Interface |
+ | | (Data) || | 1 |
+ | +--------------+ Clock Signal | L + R |
+ | +---------------------------> | (Data) |
+ +--------------------+ | |
+ +----------------+
+
+Example 6: Stereo Stream with L and R channel is rendered by 2 Masters, each
+rendering one channel, and is received by two different Slaves, each
+receiving one channel. Both Masters and both Slaves are using single port. ::
+
+ +---------------+ Clock Signal +---------------+
+ | Master +----------------------------------+ Slave |
+ | Interface | | Interface |
+ | 1 | | 1 |
+ | | Data Signal | |
+ | L +----------------------------------+ L |
+ | (Data) | Data Direction | (Data) |
+ +---------------+ +-----------------------> +---------------+
+
+ +---------------+ Clock Signal +---------------+
+ | Master +----------------------------------+ Slave |
+ | Interface | | Interface |
+ | 2 | | 2 |
+ | | Data Signal | |
+ | R +----------------------------------+ R |
+ | (Data) | Data Direction | (Data) |
+ +---------------+ +-----------------------> +---------------+
+
+Example 7: Stereo Stream with L and R channel is rendered by 2
+Masters, each rendering both channels. Each Slave receives L + R. This
+is the same application as Example 4 but with Slaves placed on
+separate links. ::
+
+ +---------------+ Clock Signal +---------------+
+ | Master +----------------------------------+ Slave |
+ | Interface | | Interface |
+ | 1 | | 1 |
+ | | Data Signal | |
+ | L + R +----------------------------------+ L + R |
+ | (Data) | Data Direction | (Data) |
+ +---------------+ +-----------------------> +---------------+
+
+ +---------------+ Clock Signal +---------------+
+ | Master +----------------------------------+ Slave |
+ | Interface | | Interface |
+ | 2 | | 2 |
+ | | Data Signal | |
+ | L + R +----------------------------------+ L + R |
+ | (Data) | Data Direction | (Data) |
+ +---------------+ +-----------------------> +---------------+
+
+Example 8: 4-channel Stream is rendered by 2 Masters, each rendering a
+2 channels. Each Slave receives 2 channels. ::
+
+ +---------------+ Clock Signal +---------------+
+ | Master +----------------------------------+ Slave |
+ | Interface | | Interface |
+ | 1 | | 1 |
+ | | Data Signal | |
+ | L1 + R1 +----------------------------------+ L1 + R1 |
+ | (Data) | Data Direction | (Data) |
+ +---------------+ +-----------------------> +---------------+
+
+ +---------------+ Clock Signal +---------------+
+ | Master +----------------------------------+ Slave |
+ | Interface | | Interface |
+ | 2 | | 2 |
+ | | Data Signal | |
+ | L2 + R2 +----------------------------------+ L2 + R2 |
+ | (Data) | Data Direction | (Data) |
+ +---------------+ +-----------------------> +---------------+
+
+Note1: In multi-link cases like above, to lock, one would acquire a global
+lock and then go on locking bus instances. But, in this case the caller
+framework(ASoC DPCM) guarantees that stream operations on a card are
+always serialized. So, there is no race condition and hence no need for
+global lock.
+
+Note2: A Slave device may be configured to receive all channels
+transmitted on a link for a given Stream (Example 4) or just a subset
+of the data (Example 3). The configuration of the Slave device is not
+handled by a SoundWire subsystem API, but instead by the
+snd_soc_dai_set_tdm_slot() API. The platform or machine driver will
+typically configure which of the slots are used. For Example 4, the
+same slots would be used by all Devices, while for Example 3 the Slave
+Device1 would use e.g. Slot 0 and Slave device2 slot 1.
+
+Note3: Multiple Sink ports can extract the same information for the
+same bitSlots in the SoundWire frame, however multiple Source ports
+shall be configured with different bitSlot configurations. This is the
+same limitation as with I2S/PCM TDM usages.
+
+SoundWire Stream Management flow
+================================
+
+Stream definitions
+------------------
+
+ (1) Current stream: This is classified as the stream on which operation has
+ to be performed like prepare, enable, disable, de-prepare etc.
+
+ (2) Active stream: This is classified as the stream which is already active
+ on Bus other than current stream. There can be multiple active streams
+ on the Bus.
+
+SoundWire Bus manages stream operations for each stream getting
+rendered/captured on the SoundWire Bus. This section explains Bus operations
+done for each of the stream allocated/released on Bus. Following are the
+stream states maintained by the Bus for each of the audio stream.
+
+
+SoundWire stream states
+-----------------------
+
+Below shows the SoundWire stream states and state transition diagram. ::
+
+ +-----------+ +------------+ +----------+ +----------+
+ | ALLOCATED +---->| CONFIGURED +---->| PREPARED +---->| ENABLED |
+ | STATE | | STATE | | STATE | | STATE |
+ +-----------+ +------------+ +---+--+---+ +----+-----+
+ ^ ^ ^
+ | | |
+ __| |___________ |
+ | | |
+ v | v
+ +----------+ +-----+------+ +-+--+-----+
+ | RELEASED |<----------+ DEPREPARED |<-------+ DISABLED |
+ | STATE | | STATE | | STATE |
+ +----------+ +------------+ +----------+
+
+NOTE: State transitions between ``SDW_STREAM_ENABLED`` and
+``SDW_STREAM_DISABLED`` are only relevant when then INFO_PAUSE flag is
+supported at the ALSA/ASoC level. Likewise the transition between
+``SDW_DISABLED_STATE`` and ``SDW_PREPARED_STATE`` depends on the
+INFO_RESUME flag.
+
+NOTE2: The framework implements basic state transition checks, but
+does not e.g. check if a transition from DISABLED to ENABLED is valid
+on a specific platform. Such tests need to be added at the ALSA/ASoC
+level.
+
+Stream State Operations
+-----------------------
+
+Below section explains the operations done by the Bus on Master(s) and
+Slave(s) as part of stream state transitions.
+
+SDW_STREAM_ALLOCATED
+~~~~~~~~~~~~~~~~~~~~
+
+Allocation state for stream. This is the entry state
+of the stream. Operations performed before entering in this state:
+
+ (1) A stream runtime is allocated for the stream. This stream
+ runtime is used as a reference for all the operations performed
+ on the stream.
+
+ (2) The resources required for holding stream runtime information are
+ allocated and initialized. This holds all stream related information
+ such as stream type (PCM/PDM) and parameters, Master and Slave
+ interface associated with the stream, stream state etc.
+
+After all above operations are successful, stream state is set to
+``SDW_STREAM_ALLOCATED``.
+
+Bus implements below API for allocate a stream which needs to be called once
+per stream. From ASoC DPCM framework, this stream state maybe linked to
+.startup() operation.
+
+.. code-block:: c
+
+ int sdw_alloc_stream(char * stream_name);
+
+The SoundWire core provides a sdw_startup_stream() helper function,
+typically called during a dailink .startup() callback, which performs
+stream allocation and sets the stream pointer for all DAIs
+connected to a stream.
+
+SDW_STREAM_CONFIGURED
+~~~~~~~~~~~~~~~~~~~~~
+
+Configuration state of stream. Operations performed before entering in
+this state:
+
+ (1) The resources allocated for stream information in SDW_STREAM_ALLOCATED
+ state are updated here. This includes stream parameters, Master(s)
+ and Slave(s) runtime information associated with current stream.
+
+ (2) All the Master(s) and Slave(s) associated with current stream provide
+ the port information to Bus which includes port numbers allocated by
+ Master(s) and Slave(s) for current stream and their channel mask.
+
+After all above operations are successful, stream state is set to
+``SDW_STREAM_CONFIGURED``.
+
+Bus implements below APIs for CONFIG state which needs to be called by
+the respective Master(s) and Slave(s) associated with stream. These APIs can
+only be invoked once by respective Master(s) and Slave(s). From ASoC DPCM
+framework, this stream state is linked to .hw_params() operation.
+
+.. code-block:: c
+
+ int sdw_stream_add_master(struct sdw_bus * bus,
+ struct sdw_stream_config * stream_config,
+ struct sdw_ports_config * ports_config,
+ struct sdw_stream_runtime * stream);
+
+ int sdw_stream_add_slave(struct sdw_slave * slave,
+ struct sdw_stream_config * stream_config,
+ struct sdw_ports_config * ports_config,
+ struct sdw_stream_runtime * stream);
+
+
+SDW_STREAM_PREPARED
+~~~~~~~~~~~~~~~~~~~
+
+Prepare state of stream. Operations performed before entering in this state:
+
+ (0) Steps 1 and 2 are omitted in the case of a resume operation,
+ where the bus bandwidth is known.
+
+ (1) Bus parameters such as bandwidth, frame shape, clock frequency,
+ are computed based on current stream as well as already active
+ stream(s) on Bus. Re-computation is required to accommodate current
+ stream on the Bus.
+
+ (2) Transport and port parameters of all Master(s) and Slave(s) port(s) are
+ computed for the current as well as already active stream based on frame
+ shape and clock frequency computed in step 1.
+
+ (3) Computed Bus and transport parameters are programmed in Master(s) and
+ Slave(s) registers. The banked registers programming is done on the
+ alternate bank (bank currently unused). Port(s) are enabled for the
+ already active stream(s) on the alternate bank (bank currently unused).
+ This is done in order to not disrupt already active stream(s).
+
+ (4) Once all the values are programmed, Bus initiates switch to alternate
+ bank where all new values programmed gets into effect.
+
+ (5) Ports of Master(s) and Slave(s) for current stream are prepared by
+ programming PrepareCtrl register.
+
+After all above operations are successful, stream state is set to
+``SDW_STREAM_PREPARED``.
+
+Bus implements below API for PREPARE state which needs to be called
+once per stream. From ASoC DPCM framework, this stream state is linked
+to .prepare() operation. Since the .trigger() operations may not
+follow the .prepare(), a direct transition from
+``SDW_STREAM_PREPARED`` to ``SDW_STREAM_DEPREPARED`` is allowed.
+
+.. code-block:: c
+
+ int sdw_prepare_stream(struct sdw_stream_runtime * stream);
+
+
+SDW_STREAM_ENABLED
+~~~~~~~~~~~~~~~~~~
+
+Enable state of stream. The data port(s) are enabled upon entering this state.
+Operations performed before entering in this state:
+
+ (1) All the values computed in SDW_STREAM_PREPARED state are programmed
+ in alternate bank (bank currently unused). It includes programming of
+ already active stream(s) as well.
+
+ (2) All the Master(s) and Slave(s) port(s) for the current stream are
+ enabled on alternate bank (bank currently unused) by programming
+ ChannelEn register.
+
+ (3) Once all the values are programmed, Bus initiates switch to alternate
+ bank where all new values programmed gets into effect and port(s)
+ associated with current stream are enabled.
+
+After all above operations are successful, stream state is set to
+``SDW_STREAM_ENABLED``.
+
+Bus implements below API for ENABLE state which needs to be called once per
+stream. From ASoC DPCM framework, this stream state is linked to
+.trigger() start operation.
+
+.. code-block:: c
+
+ int sdw_enable_stream(struct sdw_stream_runtime * stream);
+
+SDW_STREAM_DISABLED
+~~~~~~~~~~~~~~~~~~~
+
+Disable state of stream. The data port(s) are disabled upon exiting this state.
+Operations performed before entering in this state:
+
+ (1) All the Master(s) and Slave(s) port(s) for the current stream are
+ disabled on alternate bank (bank currently unused) by programming
+ ChannelEn register.
+
+ (2) All the current configuration of Bus and active stream(s) are programmed
+ into alternate bank (bank currently unused).
+
+ (3) Once all the values are programmed, Bus initiates switch to alternate
+ bank where all new values programmed gets into effect and port(s) associated
+ with current stream are disabled.
+
+After all above operations are successful, stream state is set to
+``SDW_STREAM_DISABLED``.
+
+Bus implements below API for DISABLED state which needs to be called once
+per stream. From ASoC DPCM framework, this stream state is linked to
+.trigger() stop operation.
+
+When the INFO_PAUSE flag is supported, a direct transition to
+``SDW_STREAM_ENABLED`` is allowed.
+
+For resume operations where ASoC will use the .prepare() callback, the
+stream can transition from ``SDW_STREAM_DISABLED`` to
+``SDW_STREAM_PREPARED``, with all required settings restored but
+without updating the bandwidth and bit allocation.
+
+.. code-block:: c
+
+ int sdw_disable_stream(struct sdw_stream_runtime * stream);
+
+
+SDW_STREAM_DEPREPARED
+~~~~~~~~~~~~~~~~~~~~~
+
+De-prepare state of stream. Operations performed before entering in this
+state:
+
+ (1) All the port(s) of Master(s) and Slave(s) for current stream are
+ de-prepared by programming PrepareCtrl register.
+
+ (2) The payload bandwidth of current stream is reduced from the total
+ bandwidth requirement of bus and new parameters calculated and
+ applied by performing bank switch etc.
+
+After all above operations are successful, stream state is set to
+``SDW_STREAM_DEPREPARED``.
+
+Bus implements below API for DEPREPARED state which needs to be called
+once per stream. ALSA/ASoC do not have a concept of 'deprepare', and
+the mapping from this stream state to ALSA/ASoC operation may be
+implementation specific.
+
+When the INFO_PAUSE flag is supported, the stream state is linked to
+the .hw_free() operation - the stream is not deprepared on a
+TRIGGER_STOP.
+
+Other implementations may transition to the ``SDW_STREAM_DEPREPARED``
+state on TRIGGER_STOP, should they require a transition through the
+``SDW_STREAM_PREPARED`` state.
+
+.. code-block:: c
+
+ int sdw_deprepare_stream(struct sdw_stream_runtime * stream);
+
+
+SDW_STREAM_RELEASED
+~~~~~~~~~~~~~~~~~~~
+
+Release state of stream. Operations performed before entering in this state:
+
+ (1) Release port resources for all Master(s) and Slave(s) port(s)
+ associated with current stream.
+
+ (2) Release Master(s) and Slave(s) runtime resources associated with
+ current stream.
+
+ (3) Release stream runtime resources associated with current stream.
+
+After all above operations are successful, stream state is set to
+``SDW_STREAM_RELEASED``.
+
+Bus implements below APIs for RELEASE state which needs to be called by
+all the Master(s) and Slave(s) associated with stream. From ASoC DPCM
+framework, this stream state is linked to .hw_free() operation.
+
+.. code-block:: c
+
+ int sdw_stream_remove_master(struct sdw_bus * bus,
+ struct sdw_stream_runtime * stream);
+ int sdw_stream_remove_slave(struct sdw_slave * slave,
+ struct sdw_stream_runtime * stream);
+
+
+The .shutdown() ASoC DPCM operation calls below Bus API to release
+stream assigned as part of ALLOCATED state.
+
+In .shutdown() the data structure maintaining stream state are freed up.
+
+.. code-block:: c
+
+ void sdw_release_stream(struct sdw_stream_runtime * stream);
+
+The SoundWire core provides a sdw_shutdown_stream() helper function,
+typically called during a dailink .shutdown() callback, which clears
+the stream pointer for all DAIS connected to a stream and releases the
+memory allocated for the stream.
+
+Not Supported
+=============
+
+1. A single port with multiple channels supported cannot be used between two
+ streams or across stream. For example a port with 4 channels cannot be used
+ to handle 2 independent stereo streams even though it's possible in theory
+ in SoundWire.
diff --git a/Documentation/driver-api/soundwire/summary.rst b/Documentation/driver-api/soundwire/summary.rst
new file mode 100644
index 0000000000..01dcb954f6
--- /dev/null
+++ b/Documentation/driver-api/soundwire/summary.rst
@@ -0,0 +1,208 @@
+===========================
+SoundWire Subsystem Summary
+===========================
+
+SoundWire is a new interface ratified in 2015 by the MIPI Alliance.
+SoundWire is used for transporting data typically related to audio
+functions. SoundWire interface is optimized to integrate audio devices in
+mobile or mobile inspired systems.
+
+SoundWire is a 2-pin multi-drop interface with data and clock line. It
+facilitates development of low cost, efficient, high performance systems.
+Broad level key features of SoundWire interface include:
+
+ (1) Transporting all of payload data channels, control information, and setup
+ commands over a single two-pin interface.
+
+ (2) Lower clock frequency, and hence lower power consumption, by use of DDR
+ (Dual Data Rate) data transmission.
+
+ (3) Clock scaling and optional multiple data lanes to give wide flexibility
+ in data rate to match system requirements.
+
+ (4) Device status monitoring, including interrupt-style alerts to the Master.
+
+The SoundWire protocol supports up to eleven Slave interfaces. All the
+interfaces share the common Bus containing data and clock line. Each of the
+Slaves can support up to 14 Data Ports. 13 Data Ports are dedicated to audio
+transport. Data Port0 is dedicated to transport of Bulk control information,
+each of the audio Data Ports (1..14) can support up to 8 Channels in
+transmit or receiving mode (typically fixed direction but configurable
+direction is enabled by the specification). Bandwidth restrictions to
+~19.2..24.576Mbits/s don't however allow for 11*13*8 channels to be
+transmitted simultaneously.
+
+Below figure shows an example of connectivity between a SoundWire Master and
+two Slave devices. ::
+
+ +---------------+ +---------------+
+ | | Clock Signal | |
+ | Master |-------+-------------------------------| Slave |
+ | Interface | | Data Signal | Interface 1 |
+ | |-------|-------+-----------------------| |
+ +---------------+ | | +---------------+
+ | |
+ | |
+ | |
+ +--+-------+--+
+ | |
+ | Slave |
+ | Interface 2 |
+ | |
+ +-------------+
+
+
+Terminology
+===========
+
+The MIPI SoundWire specification uses the term 'device' to refer to a Master
+or Slave interface, which of course can be confusing. In this summary and
+code we use the term interface only to refer to the hardware. We follow the
+Linux device model by mapping each Slave interface connected on the bus as a
+device managed by a specific driver. The Linux SoundWire subsystem provides
+a framework to implement a SoundWire Slave driver with an API allowing
+3rd-party vendors to enable implementation-defined functionality while
+common setup/configuration tasks are handled by the bus.
+
+Bus:
+Implements SoundWire Linux Bus which handles the SoundWire protocol.
+Programs all the MIPI-defined Slave registers. Represents a SoundWire
+Master. Multiple instances of Bus may be present in a system.
+
+Slave:
+Registers as SoundWire Slave device (Linux Device). Multiple Slave devices
+can register to a Bus instance.
+
+Slave driver:
+Driver controlling the Slave device. MIPI-specified registers are controlled
+directly by the Bus (and transmitted through the Master driver/interface).
+Any implementation-defined Slave register is controlled by Slave driver. In
+practice, it is expected that the Slave driver relies on regmap and does not
+request direct register access.
+
+Programming interfaces (SoundWire Master interface Driver)
+==========================================================
+
+SoundWire Bus supports programming interfaces for the SoundWire Master
+implementation and SoundWire Slave devices. All the code uses the "sdw"
+prefix commonly used by SoC designers and 3rd party vendors.
+
+Each of the SoundWire Master interfaces needs to be registered to the Bus.
+Bus implements API to read standard Master MIPI properties and also provides
+callback in Master ops for Master driver to implement its own functions that
+provides capabilities information. DT support is not implemented at this
+time but should be trivial to add since capabilities are enabled with the
+``device_property_`` API.
+
+The Master interface along with the Master interface capabilities are
+registered based on board file, DT or ACPI.
+
+Following is the Bus API to register the SoundWire Bus:
+
+.. code-block:: c
+
+ int sdw_bus_master_add(struct sdw_bus *bus,
+ struct device *parent,
+ struct fwnode_handle)
+ {
+ sdw_master_device_add(bus, parent, fwnode);
+
+ mutex_init(&bus->lock);
+ INIT_LIST_HEAD(&bus->slaves);
+
+ /* Check ACPI for Slave devices */
+ sdw_acpi_find_slaves(bus);
+
+ /* Check DT for Slave devices */
+ sdw_of_find_slaves(bus);
+
+ return 0;
+ }
+
+This will initialize sdw_bus object for Master device. "sdw_master_ops" and
+"sdw_master_port_ops" callback functions are provided to the Bus.
+
+"sdw_master_ops" is used by Bus to control the Bus in the hardware specific
+way. It includes Bus control functions such as sending the SoundWire
+read/write messages on Bus, setting up clock frequency & Stream
+Synchronization Point (SSP). The "sdw_master_ops" structure abstracts the
+hardware details of the Master from the Bus.
+
+"sdw_master_port_ops" is used by Bus to setup the Port parameters of the
+Master interface Port. Master interface Port register map is not defined by
+MIPI specification, so Bus calls the "sdw_master_port_ops" callback
+function to do Port operations like "Port Prepare", "Port Transport params
+set", "Port enable and disable". The implementation of the Master driver can
+then perform hardware-specific configurations.
+
+Programming interfaces (SoundWire Slave Driver)
+===============================================
+
+The MIPI specification requires each Slave interface to expose a unique
+48-bit identifier, stored in 6 read-only dev_id registers. This dev_id
+identifier contains vendor and part information, as well as a field enabling
+to differentiate between identical components. An additional class field is
+currently unused. Slave driver is written for a specific vendor and part
+identifier, Bus enumerates the Slave device based on these two ids.
+Slave device and driver match is done based on these two ids . Probe
+of the Slave driver is called by Bus on successful match between device and
+driver id. A parent/child relationship is enforced between Master and Slave
+devices (the logical representation is aligned with the physical
+connectivity).
+
+The information on Master/Slave dependencies is stored in platform data,
+board-file, ACPI or DT. The MIPI Software specification defines additional
+link_id parameters for controllers that have multiple Master interfaces. The
+dev_id registers are only unique in the scope of a link, and the link_id
+unique in the scope of a controller. Both dev_id and link_id are not
+necessarily unique at the system level but the parent/child information is
+used to avoid ambiguity.
+
+.. code-block:: c
+
+ static const struct sdw_device_id slave_id[] = {
+ SDW_SLAVE_ENTRY(0x025d, 0x700, 0),
+ {},
+ };
+ MODULE_DEVICE_TABLE(sdw, slave_id);
+
+ static struct sdw_driver slave_sdw_driver = {
+ .driver = {
+ .name = "slave_xxx",
+ .pm = &slave_runtime_pm,
+ },
+ .probe = slave_sdw_probe,
+ .remove = slave_sdw_remove,
+ .ops = &slave_slave_ops,
+ .id_table = slave_id,
+ };
+
+
+For capabilities, Bus implements API to read standard Slave MIPI properties
+and also provides callback in Slave ops for Slave driver to implement own
+function that provides capabilities information. Bus needs to know a set of
+Slave capabilities to program Slave registers and to control the Bus
+reconfigurations.
+
+Future enhancements to be done
+==============================
+
+ (1) Bulk Register Access (BRA) transfers.
+
+
+ (2) Multiple data lane support.
+
+Links
+=====
+
+SoundWire MIPI specification 1.1 is available at:
+https://members.mipi.org/wg/All-Members/document/70290
+
+SoundWire MIPI DisCo (Discovery and Configuration) specification is
+available at:
+https://www.mipi.org/specifications/mipi-disco-soundwire
+
+(publicly accessible with registration or directly accessible to MIPI
+members)
+
+MIPI Alliance Manufacturer ID Page: mid.mipi.org
diff --git a/Documentation/driver-api/spi.rst b/Documentation/driver-api/spi.rst
new file mode 100644
index 0000000000..f288870450
--- /dev/null
+++ b/Documentation/driver-api/spi.rst
@@ -0,0 +1,53 @@
+Serial Peripheral Interface (SPI)
+=================================
+
+SPI is the "Serial Peripheral Interface", widely used with embedded
+systems because it is a simple and efficient interface: basically a
+multiplexed shift register. Its three signal wires hold a clock (SCK,
+often in the range of 1-20 MHz), a "Master Out, Slave In" (MOSI) data
+line, and a "Master In, Slave Out" (MISO) data line. SPI is a full
+duplex protocol; for each bit shifted out the MOSI line (one per clock)
+another is shifted in on the MISO line. Those bits are assembled into
+words of various sizes on the way to and from system memory. An
+additional chipselect line is usually active-low (nCS); four signals are
+normally used for each peripheral, plus sometimes an interrupt.
+
+The SPI bus facilities listed here provide a generalized interface to
+declare SPI busses and devices, manage them according to the standard
+Linux driver model, and perform input/output operations. At this time,
+only "master" side interfaces are supported, where Linux talks to SPI
+peripherals and does not implement such a peripheral itself. (Interfaces
+to support implementing SPI slaves would necessarily look different.)
+
+The programming interface is structured around two kinds of driver, and
+two kinds of device. A "Controller Driver" abstracts the controller
+hardware, which may be as simple as a set of GPIO pins or as complex as
+a pair of FIFOs connected to dual DMA engines on the other side of the
+SPI shift register (maximizing throughput). Such drivers bridge between
+whatever bus they sit on (often the platform bus) and SPI, and expose
+the SPI side of their device as a :c:type:`struct spi_controller
+<spi_controller>`. SPI devices are children of that master,
+represented as a :c:type:`struct spi_device <spi_device>` and
+manufactured from :c:type:`struct spi_board_info
+<spi_board_info>` descriptors which are usually provided by
+board-specific initialization code. A :c:type:`struct spi_driver
+<spi_driver>` is called a "Protocol Driver", and is bound to a
+spi_device using normal driver model calls.
+
+The I/O model is a set of queued messages. Protocol drivers submit one
+or more :c:type:`struct spi_message <spi_message>` objects,
+which are processed and completed asynchronously. (There are synchronous
+wrappers, however.) Messages are built from one or more
+:c:type:`struct spi_transfer <spi_transfer>` objects, each of
+which wraps a full duplex SPI transfer. A variety of protocol tweaking
+options are needed, because different chips adopt very different
+policies for how they use the bits transferred with SPI.
+
+.. kernel-doc:: include/linux/spi/spi.h
+ :internal:
+
+.. kernel-doc:: drivers/spi/spi.c
+ :functions: spi_register_board_info
+
+.. kernel-doc:: drivers/spi/spi.c
+ :export:
diff --git a/Documentation/driver-api/surface_aggregator/client-api.rst b/Documentation/driver-api/surface_aggregator/client-api.rst
new file mode 100644
index 0000000000..8e0b000d0e
--- /dev/null
+++ b/Documentation/driver-api/surface_aggregator/client-api.rst
@@ -0,0 +1,38 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+===============================
+Client Driver API Documentation
+===============================
+
+.. contents::
+ :depth: 2
+
+
+Serial Hub Communication
+========================
+
+.. kernel-doc:: include/linux/surface_aggregator/serial_hub.h
+
+.. kernel-doc:: drivers/platform/surface/aggregator/ssh_packet_layer.c
+ :export:
+
+
+Controller and Core Interface
+=============================
+
+.. kernel-doc:: include/linux/surface_aggregator/controller.h
+
+.. kernel-doc:: drivers/platform/surface/aggregator/controller.c
+ :export:
+
+.. kernel-doc:: drivers/platform/surface/aggregator/core.c
+ :export:
+
+
+Client Bus and Client Device API
+================================
+
+.. kernel-doc:: include/linux/surface_aggregator/device.h
+
+.. kernel-doc:: drivers/platform/surface/aggregator/bus.c
+ :export:
diff --git a/Documentation/driver-api/surface_aggregator/client.rst b/Documentation/driver-api/surface_aggregator/client.rst
new file mode 100644
index 0000000000..e100ab0a24
--- /dev/null
+++ b/Documentation/driver-api/surface_aggregator/client.rst
@@ -0,0 +1,397 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+.. |ssam_controller| replace:: :c:type:`struct ssam_controller <ssam_controller>`
+.. |ssam_device| replace:: :c:type:`struct ssam_device <ssam_device>`
+.. |ssam_device_driver| replace:: :c:type:`struct ssam_device_driver <ssam_device_driver>`
+.. |ssam_client_bind| replace:: :c:func:`ssam_client_bind`
+.. |ssam_client_link| replace:: :c:func:`ssam_client_link`
+.. |ssam_get_controller| replace:: :c:func:`ssam_get_controller`
+.. |ssam_controller_get| replace:: :c:func:`ssam_controller_get`
+.. |ssam_controller_put| replace:: :c:func:`ssam_controller_put`
+.. |ssam_device_alloc| replace:: :c:func:`ssam_device_alloc`
+.. |ssam_device_add| replace:: :c:func:`ssam_device_add`
+.. |ssam_device_remove| replace:: :c:func:`ssam_device_remove`
+.. |ssam_device_driver_register| replace:: :c:func:`ssam_device_driver_register`
+.. |ssam_device_driver_unregister| replace:: :c:func:`ssam_device_driver_unregister`
+.. |module_ssam_device_driver| replace:: :c:func:`module_ssam_device_driver`
+.. |SSAM_DEVICE| replace:: :c:func:`SSAM_DEVICE`
+.. |ssam_notifier_register| replace:: :c:func:`ssam_notifier_register`
+.. |ssam_notifier_unregister| replace:: :c:func:`ssam_notifier_unregister`
+.. |ssam_device_notifier_register| replace:: :c:func:`ssam_device_notifier_register`
+.. |ssam_device_notifier_unregister| replace:: :c:func:`ssam_device_notifier_unregister`
+.. |ssam_request_do_sync| replace:: :c:func:`ssam_request_do_sync`
+.. |ssam_event_mask| replace:: :c:type:`enum ssam_event_mask <ssam_event_mask>`
+
+
+======================
+Writing Client Drivers
+======================
+
+For the API documentation, refer to:
+
+.. toctree::
+ :maxdepth: 2
+
+ client-api
+
+
+Overview
+========
+
+Client drivers can be set up in two main ways, depending on how the
+corresponding device is made available to the system. We specifically
+differentiate between devices that are presented to the system via one of
+the conventional ways, e.g. as platform devices via ACPI, and devices that
+are non-discoverable and instead need to be explicitly provided by some
+other mechanism, as discussed further below.
+
+
+Non-SSAM Client Drivers
+=======================
+
+All communication with the SAM EC is handled via the |ssam_controller|
+representing that EC to the kernel. Drivers targeting a non-SSAM device (and
+thus not being a |ssam_device_driver|) need to explicitly establish a
+connection/relation to that controller. This can be done via the
+|ssam_client_bind| function. Said function returns a reference to the SSAM
+controller, but, more importantly, also establishes a device link between
+client device and controller (this can also be done separate via
+|ssam_client_link|). It is important to do this, as it, first, guarantees
+that the returned controller is valid for use in the client driver for as
+long as this driver is bound to its device, i.e. that the driver gets
+unbound before the controller ever becomes invalid, and, second, as it
+ensures correct suspend/resume ordering. This setup should be done in the
+driver's probe function, and may be used to defer probing in case the SSAM
+subsystem is not ready yet, for example:
+
+.. code-block:: c
+
+ static int client_driver_probe(struct platform_device *pdev)
+ {
+ struct ssam_controller *ctrl;
+
+ ctrl = ssam_client_bind(&pdev->dev);
+ if (IS_ERR(ctrl))
+ return PTR_ERR(ctrl) == -ENODEV ? -EPROBE_DEFER : PTR_ERR(ctrl);
+
+ // ...
+
+ return 0;
+ }
+
+The controller may be separately obtained via |ssam_get_controller| and its
+lifetime be guaranteed via |ssam_controller_get| and |ssam_controller_put|.
+Note that none of these functions, however, guarantee that the controller
+will not be shut down or suspended. These functions essentially only operate
+on the reference, i.e. only guarantee a bare minimum of accessibility
+without any guarantees at all on practical operability.
+
+
+Adding SSAM Devices
+===================
+
+If a device does not already exist/is not already provided via conventional
+means, it should be provided as |ssam_device| via the SSAM client device
+hub. New devices can be added to this hub by entering their UID into the
+corresponding registry. SSAM devices can also be manually allocated via
+|ssam_device_alloc|, subsequently to which they have to be added via
+|ssam_device_add| and eventually removed via |ssam_device_remove|. By
+default, the parent of the device is set to the controller device provided
+for allocation, however this may be changed before the device is added. Note
+that, when changing the parent device, care must be taken to ensure that the
+controller lifetime and suspend/resume ordering guarantees, in the default
+setup provided through the parent-child relation, are preserved. If
+necessary, by use of |ssam_client_link| as is done for non-SSAM client
+drivers and described in more detail above.
+
+A client device must always be removed by the party which added the
+respective device before the controller shuts down. Such removal can be
+guaranteed by linking the driver providing the SSAM device to the controller
+via |ssam_client_link|, causing it to unbind before the controller driver
+unbinds. Client devices registered with the controller as parent are
+automatically removed when the controller shuts down, but this should not be
+relied upon, especially as this does not extend to client devices with a
+different parent.
+
+
+SSAM Client Drivers
+===================
+
+SSAM client device drivers are, in essence, no different than other device
+driver types. They are represented via |ssam_device_driver| and bind to a
+|ssam_device| via its UID (:c:type:`struct ssam_device.uid <ssam_device>`)
+member and the match table
+(:c:type:`struct ssam_device_driver.match_table <ssam_device_driver>`),
+which should be set when declaring the driver struct instance. Refer to the
+|SSAM_DEVICE| macro documentation for more details on how to define members
+of the driver's match table.
+
+The UID for SSAM client devices consists of a ``domain``, a ``category``,
+a ``target``, an ``instance``, and a ``function``. The ``domain`` is used
+differentiate between physical SAM devices
+(:c:type:`SSAM_DOMAIN_SERIALHUB <ssam_device_domain>`), i.e. devices that can
+be accessed via the Surface Serial Hub, and virtual ones
+(:c:type:`SSAM_DOMAIN_VIRTUAL <ssam_device_domain>`), such as client-device
+hubs, that have no real representation on the SAM EC and are solely used on
+the kernel/driver-side. For physical devices, ``category`` represents the
+target category, ``target`` the target ID, and ``instance`` the instance ID
+used to access the physical SAM device. In addition, ``function`` references
+a specific device functionality, but has no meaning to the SAM EC. The
+(default) name of a client device is generated based on its UID.
+
+A driver instance can be registered via |ssam_device_driver_register| and
+unregistered via |ssam_device_driver_unregister|. For convenience, the
+|module_ssam_device_driver| macro may be used to define module init- and
+exit-functions registering the driver.
+
+The controller associated with a SSAM client device can be found in its
+:c:type:`struct ssam_device.ctrl <ssam_device>` member. This reference is
+guaranteed to be valid for at least as long as the client driver is bound,
+but should also be valid for as long as the client device exists. Note,
+however, that access outside of the bound client driver must ensure that the
+controller device is not suspended while making any requests or
+(un-)registering event notifiers (and thus should generally be avoided). This
+is guaranteed when the controller is accessed from inside the bound client
+driver.
+
+
+Making Synchronous Requests
+===========================
+
+Synchronous requests are (currently) the main form of host-initiated
+communication with the EC. There are a couple of ways to define and execute
+such requests, however, most of them boil down to something similar as shown
+in the example below. This example defines a write-read request, meaning
+that the caller provides an argument to the SAM EC and receives a response.
+The caller needs to know the (maximum) length of the response payload and
+provide a buffer for it.
+
+Care must be taken to ensure that any command payload data passed to the SAM
+EC is provided in little-endian format and, similarly, any response payload
+data received from it is converted from little-endian to host endianness.
+
+.. code-block:: c
+
+ int perform_request(struct ssam_controller *ctrl, u32 arg, u32 *ret)
+ {
+ struct ssam_request rqst;
+ struct ssam_response resp;
+ int status;
+
+ /* Convert request argument to little-endian. */
+ __le32 arg_le = cpu_to_le32(arg);
+ __le32 ret_le = cpu_to_le32(0);
+
+ /*
+ * Initialize request specification. Replace this with your values.
+ * The rqst.payload field may be NULL if rqst.length is zero,
+ * indicating that the request does not have any argument.
+ *
+ * Note: The request parameters used here are not valid, i.e.
+ * they do not correspond to an actual SAM/EC request.
+ */
+ rqst.target_category = SSAM_SSH_TC_SAM;
+ rqst.target_id = SSAM_SSH_TID_SAM;
+ rqst.command_id = 0x02;
+ rqst.instance_id = 0x03;
+ rqst.flags = SSAM_REQUEST_HAS_RESPONSE;
+ rqst.length = sizeof(arg_le);
+ rqst.payload = (u8 *)&arg_le;
+
+ /* Initialize request response. */
+ resp.capacity = sizeof(ret_le);
+ resp.length = 0;
+ resp.pointer = (u8 *)&ret_le;
+
+ /*
+ * Perform actual request. The response pointer may be null in case
+ * the request does not have any response. This must be consistent
+ * with the SSAM_REQUEST_HAS_RESPONSE flag set in the specification
+ * above.
+ */
+ status = ssam_request_do_sync(ctrl, &rqst, &resp);
+
+ /*
+ * Alternatively use
+ *
+ * ssam_request_do_sync_onstack(ctrl, &rqst, &resp, sizeof(arg_le));
+ *
+ * to perform the request, allocating the message buffer directly
+ * on the stack as opposed to allocation via kzalloc().
+ */
+
+ /*
+ * Convert request response back to native format. Note that in the
+ * error case, this value is not touched by the SSAM core, i.e.
+ * 'ret_le' will be zero as specified in its initialization.
+ */
+ *ret = le32_to_cpu(ret_le);
+
+ return status;
+ }
+
+Note that |ssam_request_do_sync| in its essence is a wrapper over lower-level
+request primitives, which may also be used to perform requests. Refer to its
+implementation and documentation for more details.
+
+An arguably more user-friendly way of defining such functions is by using
+one of the generator macros, for example via:
+
+.. code-block:: c
+
+ SSAM_DEFINE_SYNC_REQUEST_W(__ssam_tmp_perf_mode_set, __le32, {
+ .target_category = SSAM_SSH_TC_TMP,
+ .target_id = SSAM_SSH_TID_SAM,
+ .command_id = 0x03,
+ .instance_id = 0x00,
+ });
+
+This example defines a function
+
+.. code-block:: c
+
+ static int __ssam_tmp_perf_mode_set(struct ssam_controller *ctrl, const __le32 *arg);
+
+executing the specified request, with the controller passed in when calling
+said function. In this example, the argument is provided via the ``arg``
+pointer. Note that the generated function allocates the message buffer on
+the stack. Thus, if the argument provided via the request is large, these
+kinds of macros should be avoided. Also note that, in contrast to the
+previous non-macro example, this function does not do any endianness
+conversion, which has to be handled by the caller. Apart from those
+differences the function generated by the macro is similar to the one
+provided in the non-macro example above.
+
+The full list of such function-generating macros is
+
+- :c:func:`SSAM_DEFINE_SYNC_REQUEST_N` for requests without return value and
+ without argument.
+- :c:func:`SSAM_DEFINE_SYNC_REQUEST_R` for requests with return value but no
+ argument.
+- :c:func:`SSAM_DEFINE_SYNC_REQUEST_W` for requests without return value but
+ with argument.
+
+Refer to their respective documentation for more details. For each one of
+these macros, a special variant is provided, which targets request types
+applicable to multiple instances of the same device type:
+
+- :c:func:`SSAM_DEFINE_SYNC_REQUEST_MD_N`
+- :c:func:`SSAM_DEFINE_SYNC_REQUEST_MD_R`
+- :c:func:`SSAM_DEFINE_SYNC_REQUEST_MD_W`
+
+The difference of those macros to the previously mentioned versions is, that
+the device target and instance IDs are not fixed for the generated function,
+but instead have to be provided by the caller of said function.
+
+Additionally, variants for direct use with client devices, i.e.
+|ssam_device|, are also provided. These can, for example, be used as
+follows:
+
+.. code-block:: c
+
+ SSAM_DEFINE_SYNC_REQUEST_CL_R(ssam_bat_get_sta, __le32, {
+ .target_category = SSAM_SSH_TC_BAT,
+ .command_id = 0x01,
+ });
+
+This invocation of the macro defines a function
+
+.. code-block:: c
+
+ static int ssam_bat_get_sta(struct ssam_device *sdev, __le32 *ret);
+
+executing the specified request, using the device IDs and controller given
+in the client device. The full list of such macros for client devices is:
+
+- :c:func:`SSAM_DEFINE_SYNC_REQUEST_CL_N`
+- :c:func:`SSAM_DEFINE_SYNC_REQUEST_CL_R`
+- :c:func:`SSAM_DEFINE_SYNC_REQUEST_CL_W`
+
+
+Handling Events
+===============
+
+To receive events from the SAM EC, an event notifier must be registered for
+the desired event via |ssam_notifier_register|. The notifier must be
+unregistered via |ssam_notifier_unregister| once it is not required any
+more. For |ssam_device| type clients, the |ssam_device_notifier_register| and
+|ssam_device_notifier_unregister| wrappers should be preferred as they properly
+handle hot-removal of client devices.
+
+Event notifiers are registered by providing (at minimum) a callback to call
+in case an event has been received, the registry specifying how the event
+should be enabled, an event ID specifying for which target category and,
+optionally and depending on the registry used, for which instance ID events
+should be enabled, and finally, flags describing how the EC will send these
+events. If the specific registry does not enable events by instance ID, the
+instance ID must be set to zero. Additionally, a priority for the respective
+notifier may be specified, which determines its order in relation to any
+other notifier registered for the same target category.
+
+By default, event notifiers will receive all events for the specific target
+category, regardless of the instance ID specified when registering the
+notifier. The core may be instructed to only call a notifier if the target
+ID or instance ID (or both) of the event match the ones implied by the
+notifier IDs (in case of target ID, the target ID of the registry), by
+providing an event mask (see |ssam_event_mask|).
+
+In general, the target ID of the registry is also the target ID of the
+enabled event (with the notable exception being keyboard input events on the
+Surface Laptop 1 and 2, which are enabled via a registry with target ID 1,
+but provide events with target ID 2).
+
+A full example for registering an event notifier and handling received
+events is provided below:
+
+.. code-block:: c
+
+ u32 notifier_callback(struct ssam_event_notifier *nf,
+ const struct ssam_event *event)
+ {
+ int status = ...
+
+ /* Handle the event here ... */
+
+ /* Convert return value and indicate that we handled the event. */
+ return ssam_notifier_from_errno(status) | SSAM_NOTIF_HANDLED;
+ }
+
+ int setup_notifier(struct ssam_device *sdev,
+ struct ssam_event_notifier *nf)
+ {
+ /* Set priority wrt. other handlers of same target category. */
+ nf->base.priority = 1;
+
+ /* Set event/notifier callback. */
+ nf->base.fn = notifier_callback;
+
+ /* Specify event registry, i.e. how events get enabled/disabled. */
+ nf->event.reg = SSAM_EVENT_REGISTRY_KIP;
+
+ /* Specify which event to enable/disable */
+ nf->event.id.target_category = sdev->uid.category;
+ nf->event.id.instance = sdev->uid.instance;
+
+ /*
+ * Specify for which events the notifier callback gets executed.
+ * This essentially tells the core if it can skip notifiers that
+ * don't have target or instance IDs matching those of the event.
+ */
+ nf->event.mask = SSAM_EVENT_MASK_STRICT;
+
+ /* Specify event flags. */
+ nf->event.flags = SSAM_EVENT_SEQUENCED;
+
+ return ssam_notifier_register(sdev->ctrl, nf);
+ }
+
+Multiple event notifiers can be registered for the same event. The event
+handler core takes care of enabling and disabling events when notifiers are
+registered and unregistered, by keeping track of how many notifiers for a
+specific event (combination of registry, event target category, and event
+instance ID) are currently registered. This means that a specific event will
+be enabled when the first notifier for it is being registered and disabled
+when the last notifier for it is being unregistered. Note that the event
+flags are therefore only used on the first registered notifier, however, one
+should take care that notifiers for a specific event are always registered
+with the same flag and it is considered a bug to do otherwise.
diff --git a/Documentation/driver-api/surface_aggregator/clients/cdev.rst b/Documentation/driver-api/surface_aggregator/clients/cdev.rst
new file mode 100644
index 0000000000..0134a841a0
--- /dev/null
+++ b/Documentation/driver-api/surface_aggregator/clients/cdev.rst
@@ -0,0 +1,204 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+.. |ssam_cdev_request| replace:: :c:type:`struct ssam_cdev_request <ssam_cdev_request>`
+.. |ssam_cdev_request_flags| replace:: :c:type:`enum ssam_cdev_request_flags <ssam_cdev_request_flags>`
+.. |ssam_cdev_event| replace:: :c:type:`struct ssam_cdev_event <ssam_cdev_event>`
+
+==============================
+User-Space EC Interface (cdev)
+==============================
+
+The ``surface_aggregator_cdev`` module provides a misc-device for the SSAM
+controller to allow for a (more or less) direct connection from user-space to
+the SAM EC. It is intended to be used for development and debugging, and
+therefore should not be used or relied upon in any other way. Note that this
+module is not loaded automatically, but instead must be loaded manually.
+
+The provided interface is accessible through the ``/dev/surface/aggregator``
+device-file. All functionality of this interface is provided via IOCTLs.
+These IOCTLs and their respective input/output parameter structs are defined in
+``include/uapi/linux/surface_aggregator/cdev.h``.
+
+A small python library and scripts for accessing this interface can be found
+at https://github.com/linux-surface/surface-aggregator-module/tree/master/scripts/ssam.
+
+.. contents::
+
+
+Receiving Events
+================
+
+Events can be received by reading from the device-file. The are represented by
+the |ssam_cdev_event| datatype.
+
+Before events are available to be read, however, the desired notifiers must be
+registered via the ``SSAM_CDEV_NOTIF_REGISTER`` IOCTL. Notifiers are, in
+essence, callbacks, called when the EC sends an event. They are, in this
+interface, associated with a specific target category and device-file-instance.
+They forward any event of this category to the buffer of the corresponding
+instance, from which it can then be read.
+
+Notifiers themselves do not enable events on the EC. Thus, it may additionally
+be necessary to enable events via the ``SSAM_CDEV_EVENT_ENABLE`` IOCTL. While
+notifiers work per-client (i.e. per-device-file-instance), events are enabled
+globally, for the EC and all of its clients (regardless of userspace or
+non-userspace). The ``SSAM_CDEV_EVENT_ENABLE`` and ``SSAM_CDEV_EVENT_DISABLE``
+IOCTLs take care of reference counting the events, such that an event is
+enabled as long as there is a client that has requested it.
+
+Note that enabled events are not automatically disabled once the client
+instance is closed. Therefore any client process (or group of processes) should
+balance their event enable calls with the corresponding event disable calls. It
+is, however, perfectly valid to enable and disable events on different client
+instances. For example, it is valid to set up notifiers and read events on
+client instance ``A``, enable those events on instance ``B`` (note that these
+will also be received by A since events are enabled/disabled globally), and
+after no more events are desired, disable the previously enabled events via
+instance ``C``.
+
+
+Controller IOCTLs
+=================
+
+The following IOCTLs are provided:
+
+.. flat-table:: Controller IOCTLs
+ :widths: 1 1 1 1 4
+ :header-rows: 1
+
+ * - Type
+ - Number
+ - Direction
+ - Name
+ - Description
+
+ * - ``0xA5``
+ - ``1``
+ - ``WR``
+ - ``REQUEST``
+ - Perform synchronous SAM request.
+
+ * - ``0xA5``
+ - ``2``
+ - ``W``
+ - ``NOTIF_REGISTER``
+ - Register event notifier.
+
+ * - ``0xA5``
+ - ``3``
+ - ``W``
+ - ``NOTIF_UNREGISTER``
+ - Unregister event notifier.
+
+ * - ``0xA5``
+ - ``4``
+ - ``W``
+ - ``EVENT_ENABLE``
+ - Enable event source.
+
+ * - ``0xA5``
+ - ``5``
+ - ``W``
+ - ``EVENT_DISABLE``
+ - Disable event source.
+
+
+``SSAM_CDEV_REQUEST``
+---------------------
+
+Defined as ``_IOWR(0xA5, 1, struct ssam_cdev_request)``.
+
+Executes a synchronous SAM request. The request specification is passed in
+as argument of type |ssam_cdev_request|, which is then written to/modified
+by the IOCTL to return status and result of the request.
+
+Request payload data must be allocated separately and is passed in via the
+``payload.data`` and ``payload.length`` members. If a response is required,
+the response buffer must be allocated by the caller and passed in via the
+``response.data`` member. The ``response.length`` member must be set to the
+capacity of this buffer, or if no response is required, zero. Upon
+completion of the request, the call will write the response to the response
+buffer (if its capacity allows it) and overwrite the length field with the
+actual size of the response, in bytes.
+
+Additionally, if the request has a response, this must be indicated via the
+request flags, as is done with in-kernel requests. Request flags can be set
+via the ``flags`` member and the values correspond to the values found in
+|ssam_cdev_request_flags|.
+
+Finally, the status of the request itself is returned in the ``status``
+member (a negative errno value indicating failure). Note that failure
+indication of the IOCTL is separated from failure indication of the request:
+The IOCTL returns a negative status code if anything failed during setup of
+the request (``-EFAULT``) or if the provided argument or any of its fields
+are invalid (``-EINVAL``). In this case, the status value of the request
+argument may be set, providing more detail on what went wrong (e.g.
+``-ENOMEM`` for out-of-memory), but this value may also be zero. The IOCTL
+will return with a zero status code in case the request has been set up,
+submitted, and completed (i.e. handed back to user-space) successfully from
+inside the IOCTL, but the request ``status`` member may still be negative in
+case the actual execution of the request failed after it has been submitted.
+
+A full definition of the argument struct is provided below.
+
+``SSAM_CDEV_NOTIF_REGISTER``
+----------------------------
+
+Defined as ``_IOW(0xA5, 2, struct ssam_cdev_notifier_desc)``.
+
+Register a notifier for the event target category specified in the given
+notifier description with the specified priority. Notifiers registration is
+required to receive events, but does not enable events themselves. After a
+notifier for a specific target category has been registered, all events of that
+category will be forwarded to the userspace client and can then be read from
+the device file instance. Note that events may have to be enabled, e.g. via the
+``SSAM_CDEV_EVENT_ENABLE`` IOCTL, before the EC will send them.
+
+Only one notifier can be registered per target category and client instance. If
+a notifier has already been registered, this IOCTL will fail with ``-EEXIST``.
+
+Notifiers will automatically be removed when the device file instance is
+closed.
+
+``SSAM_CDEV_NOTIF_UNREGISTER``
+------------------------------
+
+Defined as ``_IOW(0xA5, 3, struct ssam_cdev_notifier_desc)``.
+
+Unregisters the notifier associated with the specified target category. The
+priority field will be ignored by this IOCTL. If no notifier has been
+registered for this client instance and the given category, this IOCTL will
+fail with ``-ENOENT``.
+
+``SSAM_CDEV_EVENT_ENABLE``
+--------------------------
+
+Defined as ``_IOW(0xA5, 4, struct ssam_cdev_event_desc)``.
+
+Enable the event associated with the given event descriptor.
+
+Note that this call will not register a notifier itself, it will only enable
+events on the controller. If you want to receive events by reading from the
+device file, you will need to register the corresponding notifier(s) on that
+instance.
+
+Events are not automatically disabled when the device file is closed. This must
+be done manually, via a call to the ``SSAM_CDEV_EVENT_DISABLE`` IOCTL.
+
+``SSAM_CDEV_EVENT_DISABLE``
+---------------------------
+
+Defined as ``_IOW(0xA5, 5, struct ssam_cdev_event_desc)``.
+
+Disable the event associated with the given event descriptor.
+
+Note that this will not unregister any notifiers. Events may still be received
+and forwarded to user-space after this call. The only safe way of stopping
+events from being received is unregistering all previously registered
+notifiers.
+
+
+Structures and Enums
+====================
+
+.. kernel-doc:: include/uapi/linux/surface_aggregator/cdev.h
diff --git a/Documentation/driver-api/surface_aggregator/clients/dtx.rst b/Documentation/driver-api/surface_aggregator/clients/dtx.rst
new file mode 100644
index 0000000000..e7e7c20007
--- /dev/null
+++ b/Documentation/driver-api/surface_aggregator/clients/dtx.rst
@@ -0,0 +1,718 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+.. |__u16| replace:: :c:type:`__u16 <__u16>`
+.. |sdtx_event| replace:: :c:type:`struct sdtx_event <sdtx_event>`
+.. |sdtx_event_code| replace:: :c:type:`enum sdtx_event_code <sdtx_event_code>`
+.. |sdtx_base_info| replace:: :c:type:`struct sdtx_base_info <sdtx_base_info>`
+.. |sdtx_device_mode| replace:: :c:type:`struct sdtx_device_mode <sdtx_device_mode>`
+
+======================================================
+User-Space DTX (Clipboard Detachment System) Interface
+======================================================
+
+The ``surface_dtx`` driver is responsible for proper clipboard detachment
+and re-attachment handling. To this end, it provides the ``/dev/surface/dtx``
+device file, through which it can interface with a user-space daemon. This
+daemon is then ultimately responsible for determining and taking necessary
+actions, such as unmounting devices attached to the base,
+unloading/reloading the graphics-driver, user-notifications, etc.
+
+There are two basic communication principles used in this driver: Commands
+(in other parts of the documentation also referred to as requests) and
+events. Commands are sent to the EC and may have a different implications in
+different contexts. Events are sent by the EC upon some internal state
+change. Commands are always driver-initiated, whereas events are always
+initiated by the EC.
+
+.. contents::
+
+Nomenclature
+============
+
+* **Clipboard:**
+ The detachable upper part of the Surface Book, housing the screen and CPU.
+
+* **Base:**
+ The lower part of the Surface Book from which the clipboard can be
+ detached, optionally (model dependent) housing the discrete GPU (dGPU).
+
+* **Latch:**
+ The mechanism keeping the clipboard attached to the base in normal
+ operation and allowing it to be detached when requested.
+
+* **Silently ignored commands:**
+ The command is accepted by the EC as a valid command and acknowledged
+ (following the standard communication protocol), but the EC does not act
+ upon it, i.e. ignores it.e upper part of the
+
+
+Detachment Process
+==================
+
+Warning: This part of the documentation is based on reverse engineering and
+testing and thus may contain errors or be incomplete.
+
+Latch States
+------------
+
+The latch mechanism has two major states: *open* and *closed*. In the
+*closed* state (default), the clipboard is secured to the base, whereas in
+the *open* state, the clipboard can be removed by a user.
+
+The latch can additionally be locked and, correspondingly, unlocked, which
+can influence the detachment procedure. Specifically, this locking mechanism
+is intended to prevent the dGPU, positioned in the base of the device, from
+being hot-unplugged while in use. More details can be found in the
+documentation for the detachment procedure below. By default, the latch is
+unlocked.
+
+Detachment Procedure
+--------------------
+
+Note that the detachment process is governed fully by the EC. The
+``surface_dtx`` driver only relays events from the EC to user-space and
+commands from user-space to the EC, i.e. it does not influence this process.
+
+The detachment process is started with the user pressing the *detach* button
+on the base of the device or executing the ``SDTX_IOCTL_LATCH_REQUEST`` IOCTL.
+Following that:
+
+1. The EC turns on the indicator led on the detach-button, sends a
+ *detach-request* event (``SDTX_EVENT_REQUEST``), and awaits further
+ instructions/commands. In case the latch is unlocked, the led will flash
+ green. If the latch has been locked, the led will be solid red
+
+2. The event is, via the ``surface_dtx`` driver, relayed to user-space, where
+ an appropriate user-space daemon can handle it and send instructions back
+ to the EC via IOCTLs provided by this driver.
+
+3. The EC waits for instructions from user-space and acts according to them.
+ If the EC does not receive any instructions in a given period, it will
+ time out and continue as follows:
+
+ - If the latch is unlocked, the EC will open the latch and the clipboard
+ can be detached from the base. This is the exact behavior as without
+ this driver or any user-space daemon. See the ``SDTX_IOCTL_LATCH_CONFIRM``
+ description below for more details on the follow-up behavior of the EC.
+
+ - If the latch is locked, the EC will *not* open the latch, meaning the
+ clipboard cannot be detached from the base. Furthermore, the EC sends
+ an cancel event (``SDTX_EVENT_CANCEL``) detailing this with the cancel
+ reason ``SDTX_DETACH_TIMEDOUT`` (see :ref:`events` for details).
+
+Valid responses by a user-space daemon to a detachment request event are:
+
+- Execute ``SDTX_IOCTL_LATCH_REQUEST``. This will immediately abort the
+ detachment process. Furthermore, the EC will send a detach-request event,
+ similar to the user pressing the detach-button to cancel said process (see
+ below).
+
+- Execute ``SDTX_IOCTL_LATCH_CONFIRM``. This will cause the EC to open the
+ latch, after which the user can separate clipboard and base.
+
+ As this changes the latch state, a *latch-status* event
+ (``SDTX_EVENT_LATCH_STATUS``) will be sent once the latch has been opened
+ successfully. If the EC fails to open the latch, e.g. due to hardware
+ error or low battery, a latch-cancel event (``SDTX_EVENT_CANCEL``) will be
+ sent with the cancel reason indicating the specific failure.
+
+ If the latch is currently locked, the latch will automatically be
+ unlocked before it is opened.
+
+- Execute ``SDTX_IOCTL_LATCH_HEARTBEAT``. This will reset the internal timeout.
+ No other actions will be performed, i.e. the detachment process will neither
+ be completed nor canceled, and the EC will still be waiting for further
+ responses.
+
+- Execute ``SDTX_IOCTL_LATCH_CANCEL``. This will abort the detachment process,
+ similar to ``SDTX_IOCTL_LATCH_REQUEST``, described above, or the button
+ press, described below. A *generic request* event (``SDTX_EVENT_REQUEST``)
+ is send in response to this. In contrast to those, however, this command
+ does not trigger a new detachment process if none is currently in
+ progress.
+
+- Do nothing. The detachment process eventually times out as described in
+ point 3.
+
+See :ref:`ioctls` for more details on these responses.
+
+It is important to note that, if the user presses the detach button at any
+point when a detachment operation is in progress (i.e. after the EC has sent
+the initial *detach-request* event (``SDTX_EVENT_REQUEST``) and before it
+received the corresponding response concluding the process), the detachment
+process is canceled on the EC-level and an identical event is being sent.
+Thus a *detach-request* event, by itself, does not signal the start of the
+detachment process.
+
+The detachment process may further be canceled by the EC due to hardware
+failures or a low clipboard battery. This is done via a cancel event
+(``SDTX_EVENT_CANCEL``) with the corresponding cancel reason.
+
+
+User-Space Interface Documentation
+==================================
+
+Error Codes and Status Values
+-----------------------------
+
+Error and status codes are divided into different categories, which can be
+used to determine if the status code is an error, and, if it is, the
+severity and type of that error. The current categories are:
+
+.. flat-table:: Overview of Status/Error Categories.
+ :widths: 2 1 3
+ :header-rows: 1
+
+ * - Name
+ - Value
+ - Short Description
+
+ * - ``STATUS``
+ - ``0x0000``
+ - Non-error status codes.
+
+ * - ``RUNTIME_ERROR``
+ - ``0x1000``
+ - Non-critical runtime errors.
+
+ * - ``HARDWARE_ERROR``
+ - ``0x2000``
+ - Critical hardware failures.
+
+ * - ``UNKNOWN``
+ - ``0xF000``
+ - Unknown error codes.
+
+Other categories are reserved for future use. The ``SDTX_CATEGORY()`` macro
+can be used to determine the category of any status value. The
+``SDTX_SUCCESS()`` macro can be used to check if the status value is a
+success value (``SDTX_CATEGORY_STATUS``) or if it indicates a failure.
+
+Unknown status or error codes sent by the EC are assigned to the ``UNKNOWN``
+category by the driver and may be implemented via their own code in the
+future.
+
+Currently used error codes are:
+
+.. flat-table:: Overview of Error Codes.
+ :widths: 2 1 1 3
+ :header-rows: 1
+
+ * - Name
+ - Category
+ - Value
+ - Short Description
+
+ * - ``SDTX_DETACH_NOT_FEASIBLE``
+ - ``RUNTIME``
+ - ``0x1001``
+ - Detachment not feasible due to low clipboard battery.
+
+ * - ``SDTX_DETACH_TIMEDOUT``
+ - ``RUNTIME``
+ - ``0x1002``
+ - Detachment process timed out while the latch was locked.
+
+ * - ``SDTX_ERR_FAILED_TO_OPEN``
+ - ``HARDWARE``
+ - ``0x2001``
+ - Failed to open latch.
+
+ * - ``SDTX_ERR_FAILED_TO_REMAIN_OPEN``
+ - ``HARDWARE``
+ - ``0x2002``
+ - Failed to keep latch open.
+
+ * - ``SDTX_ERR_FAILED_TO_CLOSE``
+ - ``HARDWARE``
+ - ``0x2003``
+ - Failed to close latch.
+
+Other error codes are reserved for future use. Non-error status codes may
+overlap and are generally only unique within their use-case:
+
+.. flat-table:: Latch Status Codes.
+ :widths: 2 1 1 3
+ :header-rows: 1
+
+ * - Name
+ - Category
+ - Value
+ - Short Description
+
+ * - ``SDTX_LATCH_CLOSED``
+ - ``STATUS``
+ - ``0x0000``
+ - Latch is closed/has been closed.
+
+ * - ``SDTX_LATCH_OPENED``
+ - ``STATUS``
+ - ``0x0001``
+ - Latch is open/has been opened.
+
+.. flat-table:: Base State Codes.
+ :widths: 2 1 1 3
+ :header-rows: 1
+
+ * - Name
+ - Category
+ - Value
+ - Short Description
+
+ * - ``SDTX_BASE_DETACHED``
+ - ``STATUS``
+ - ``0x0000``
+ - Base has been detached/is not present.
+
+ * - ``SDTX_BASE_ATTACHED``
+ - ``STATUS``
+ - ``0x0001``
+ - Base has been attached/is present.
+
+Again, other codes are reserved for future use.
+
+.. _events:
+
+Events
+------
+
+Events can be received by reading from the device file. They are disabled by
+default and have to be enabled by executing ``SDTX_IOCTL_EVENTS_ENABLE``
+first. All events follow the layout prescribed by |sdtx_event|. Specific
+event types can be identified by their event code, described in
+|sdtx_event_code|. Note that other event codes are reserved for future use,
+thus an event parser must be able to handle any unknown/unsupported event
+types gracefully, by relying on the payload length given in the event header.
+
+Currently provided event types are:
+
+.. flat-table:: Overview of DTX events.
+ :widths: 2 1 1 3
+ :header-rows: 1
+
+ * - Name
+ - Code
+ - Payload
+ - Short Description
+
+ * - ``SDTX_EVENT_REQUEST``
+ - ``1``
+ - ``0`` bytes
+ - Detachment process initiated/aborted.
+
+ * - ``SDTX_EVENT_CANCEL``
+ - ``2``
+ - ``2`` bytes
+ - EC canceled detachment process.
+
+ * - ``SDTX_EVENT_BASE_CONNECTION``
+ - ``3``
+ - ``4`` bytes
+ - Base connection state changed.
+
+ * - ``SDTX_EVENT_LATCH_STATUS``
+ - ``4``
+ - ``2`` bytes
+ - Latch status changed.
+
+ * - ``SDTX_EVENT_DEVICE_MODE``
+ - ``5``
+ - ``2`` bytes
+ - Device mode changed.
+
+Individual events in more detail:
+
+``SDTX_EVENT_REQUEST``
+^^^^^^^^^^^^^^^^^^^^^^
+
+Sent when a detachment process is started or, if in progress, aborted by the
+user, either via a detach button press or a detach request
+(``SDTX_IOCTL_LATCH_REQUEST``) being sent from user-space.
+
+Does not have any payload.
+
+``SDTX_EVENT_CANCEL``
+^^^^^^^^^^^^^^^^^^^^^
+
+Sent when a detachment process is canceled by the EC due to unfulfilled
+preconditions (e.g. clipboard battery too low to detach) or hardware
+failure. The reason for cancellation is given in the event payload detailed
+below and can be one of
+
+* ``SDTX_DETACH_TIMEDOUT``: Detachment timed out while the latch was locked.
+ The latch has neither been opened nor unlocked.
+
+* ``SDTX_DETACH_NOT_FEASIBLE``: Detachment not feasible due to low clipboard
+ battery.
+
+* ``SDTX_ERR_FAILED_TO_OPEN``: Could not open the latch (hardware failure).
+
+* ``SDTX_ERR_FAILED_TO_REMAIN_OPEN``: Could not keep the latch open (hardware
+ failure).
+
+* ``SDTX_ERR_FAILED_TO_CLOSE``: Could not close the latch (hardware failure).
+
+Other error codes in this context are reserved for future use.
+
+These codes can be classified via the ``SDTX_CATEGORY()`` macro to discern
+between critical hardware errors (``SDTX_CATEGORY_HARDWARE_ERROR``) or
+runtime errors (``SDTX_CATEGORY_RUNTIME_ERROR``), the latter of which may
+happen during normal operation if certain preconditions for detachment are
+not given.
+
+.. flat-table:: Detachment Cancel Event Payload
+ :widths: 1 1 4
+ :header-rows: 1
+
+ * - Field
+ - Type
+ - Description
+
+ * - ``reason``
+ - |__u16|
+ - Reason for cancellation.
+
+``SDTX_EVENT_BASE_CONNECTION``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sent when the base connection state has changed, i.e. when the base has been
+attached, detached, or detachment has become infeasible due to low clipboard
+battery. The new state and, if a base is connected, ID of the base is
+provided as payload of type |sdtx_base_info| with its layout presented
+below:
+
+.. flat-table:: Base-Connection-Change Event Payload
+ :widths: 1 1 4
+ :header-rows: 1
+
+ * - Field
+ - Type
+ - Description
+
+ * - ``state``
+ - |__u16|
+ - Base connection state.
+
+ * - ``base_id``
+ - |__u16|
+ - Type of base connected (zero if none).
+
+Possible values for ``state`` are:
+
+* ``SDTX_BASE_DETACHED``,
+* ``SDTX_BASE_ATTACHED``, and
+* ``SDTX_DETACH_NOT_FEASIBLE``.
+
+Other values are reserved for future use.
+
+``SDTX_EVENT_LATCH_STATUS``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sent when the latch status has changed, i.e. when the latch has been opened,
+closed, or an error occurred. The current status is provided as payload:
+
+.. flat-table:: Latch-Status-Change Event Payload
+ :widths: 1 1 4
+ :header-rows: 1
+
+ * - Field
+ - Type
+ - Description
+
+ * - ``status``
+ - |__u16|
+ - Latch status.
+
+Possible values for ``status`` are:
+
+* ``SDTX_LATCH_CLOSED``,
+* ``SDTX_LATCH_OPENED``,
+* ``SDTX_ERR_FAILED_TO_OPEN``,
+* ``SDTX_ERR_FAILED_TO_REMAIN_OPEN``, and
+* ``SDTX_ERR_FAILED_TO_CLOSE``.
+
+Other values are reserved for future use.
+
+``SDTX_EVENT_DEVICE_MODE``
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sent when the device mode has changed. The new device mode is provided as
+payload:
+
+.. flat-table:: Device-Mode-Change Event Payload
+ :widths: 1 1 4
+ :header-rows: 1
+
+ * - Field
+ - Type
+ - Description
+
+ * - ``mode``
+ - |__u16|
+ - Device operation mode.
+
+Possible values for ``mode`` are:
+
+* ``SDTX_DEVICE_MODE_TABLET``,
+* ``SDTX_DEVICE_MODE_LAPTOP``, and
+* ``SDTX_DEVICE_MODE_STUDIO``.
+
+Other values are reserved for future use.
+
+.. _ioctls:
+
+IOCTLs
+------
+
+The following IOCTLs are provided:
+
+.. flat-table:: Overview of DTX IOCTLs
+ :widths: 1 1 1 1 4
+ :header-rows: 1
+
+ * - Type
+ - Number
+ - Direction
+ - Name
+ - Description
+
+ * - ``0xA5``
+ - ``0x21``
+ - ``-``
+ - ``EVENTS_ENABLE``
+ - Enable events for the current file descriptor.
+
+ * - ``0xA5``
+ - ``0x22``
+ - ``-``
+ - ``EVENTS_DISABLE``
+ - Disable events for the current file descriptor.
+
+ * - ``0xA5``
+ - ``0x23``
+ - ``-``
+ - ``LATCH_LOCK``
+ - Lock the latch.
+
+ * - ``0xA5``
+ - ``0x24``
+ - ``-``
+ - ``LATCH_UNLOCK``
+ - Unlock the latch.
+
+ * - ``0xA5``
+ - ``0x25``
+ - ``-``
+ - ``LATCH_REQUEST``
+ - Request clipboard detachment.
+
+ * - ``0xA5``
+ - ``0x26``
+ - ``-``
+ - ``LATCH_CONFIRM``
+ - Confirm clipboard detachment request.
+
+ * - ``0xA5``
+ - ``0x27``
+ - ``-``
+ - ``LATCH_HEARTBEAT``
+ - Send heartbeat signal to EC.
+
+ * - ``0xA5``
+ - ``0x28``
+ - ``-``
+ - ``LATCH_CANCEL``
+ - Cancel detachment process.
+
+ * - ``0xA5``
+ - ``0x29``
+ - ``R``
+ - ``GET_BASE_INFO``
+ - Get current base/connection information.
+
+ * - ``0xA5``
+ - ``0x2A``
+ - ``R``
+ - ``GET_DEVICE_MODE``
+ - Get current device operation mode.
+
+ * - ``0xA5``
+ - ``0x2B``
+ - ``R``
+ - ``GET_LATCH_STATUS``
+ - Get current device latch status.
+
+``SDTX_IOCTL_EVENTS_ENABLE``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defined as ``_IO(0xA5, 0x22)``.
+
+Enable events for the current file descriptor. Events can be obtained by
+reading from the device, if enabled. Events are disabled by default.
+
+``SDTX_IOCTL_EVENTS_DISABLE``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defined as ``_IO(0xA5, 0x22)``.
+
+Disable events for the current file descriptor. Events can be obtained by
+reading from the device, if enabled. Events are disabled by default.
+
+``SDTX_IOCTL_LATCH_LOCK``
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defined as ``_IO(0xA5, 0x23)``.
+
+Locks the latch, causing the detachment procedure to abort without opening
+the latch on timeout. The latch is unlocked by default. This command will be
+silently ignored if the latch is already locked.
+
+``SDTX_IOCTL_LATCH_UNLOCK``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defined as ``_IO(0xA5, 0x24)``.
+
+Unlocks the latch, causing the detachment procedure to open the latch on
+timeout. The latch is unlocked by default. This command will not open the
+latch when sent during an ongoing detachment process. It will be silently
+ignored if the latch is already unlocked.
+
+``SDTX_IOCTL_LATCH_REQUEST``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defined as ``_IO(0xA5, 0x25)``.
+
+Generic latch request. Behavior depends on the context: If no
+detachment-process is active, detachment is requested. Otherwise the
+currently active detachment-process will be aborted.
+
+If a detachment process is canceled by this operation, a generic detachment
+request event (``SDTX_EVENT_REQUEST``) will be sent.
+
+This essentially behaves the same as a detachment button press.
+
+``SDTX_IOCTL_LATCH_CONFIRM``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defined as ``_IO(0xA5, 0x26)``.
+
+Acknowledges and confirms a latch request. If sent during an ongoing
+detachment process, this command causes the latch to be opened immediately.
+The latch will also be opened if it has been locked. In this case, the latch
+lock is reset to the unlocked state.
+
+This command will be silently ignored if there is currently no detachment
+procedure in progress.
+
+``SDTX_IOCTL_LATCH_HEARTBEAT``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defined as ``_IO(0xA5, 0x27)``.
+
+Sends a heartbeat, essentially resetting the detachment timeout. This
+command can be used to keep the detachment process alive while work required
+for the detachment to succeed is still in progress.
+
+This command will be silently ignored if there is currently no detachment
+procedure in progress.
+
+``SDTX_IOCTL_LATCH_CANCEL``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defined as ``_IO(0xA5, 0x28)``.
+
+Cancels detachment in progress (if any). If a detachment process is canceled
+by this operation, a generic detachment request event
+(``SDTX_EVENT_REQUEST``) will be sent.
+
+This command will be silently ignored if there is currently no detachment
+procedure in progress.
+
+``SDTX_IOCTL_GET_BASE_INFO``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defined as ``_IOR(0xA5, 0x29, struct sdtx_base_info)``.
+
+Get the current base connection state (i.e. attached/detached) and the type
+of the base connected to the clipboard. This is command essentially provides
+a way to query the information provided by the base connection change event
+(``SDTX_EVENT_BASE_CONNECTION``).
+
+Possible values for ``struct sdtx_base_info.state`` are:
+
+* ``SDTX_BASE_DETACHED``,
+* ``SDTX_BASE_ATTACHED``, and
+* ``SDTX_DETACH_NOT_FEASIBLE``.
+
+Other values are reserved for future use.
+
+``SDTX_IOCTL_GET_DEVICE_MODE``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defined as ``_IOR(0xA5, 0x2A, __u16)``.
+
+Returns the device operation mode, indicating if and how the base is
+attached to the clipboard. This is command essentially provides a way to
+query the information provided by the device mode change event
+(``SDTX_EVENT_DEVICE_MODE``).
+
+Returned values are:
+
+* ``SDTX_DEVICE_MODE_LAPTOP``
+* ``SDTX_DEVICE_MODE_TABLET``
+* ``SDTX_DEVICE_MODE_STUDIO``
+
+See |sdtx_device_mode| for details. Other values are reserved for future
+use.
+
+
+``SDTX_IOCTL_GET_LATCH_STATUS``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defined as ``_IOR(0xA5, 0x2B, __u16)``.
+
+Get the current latch status or (presumably) the last error encountered when
+trying to open/close the latch. This is command essentially provides a way
+to query the information provided by the latch status change event
+(``SDTX_EVENT_LATCH_STATUS``).
+
+Returned values are:
+
+* ``SDTX_LATCH_CLOSED``,
+* ``SDTX_LATCH_OPENED``,
+* ``SDTX_ERR_FAILED_TO_OPEN``,
+* ``SDTX_ERR_FAILED_TO_REMAIN_OPEN``, and
+* ``SDTX_ERR_FAILED_TO_CLOSE``.
+
+Other values are reserved for future use.
+
+A Note on Base IDs
+------------------
+
+Base types/IDs provided via ``SDTX_EVENT_BASE_CONNECTION`` or
+``SDTX_IOCTL_GET_BASE_INFO`` are directly forwarded from the EC in the lower
+byte of the combined |__u16| value, with the driver storing the EC type from
+which this ID comes in the high byte (without this, base IDs over different
+types of ECs may be overlapping).
+
+The ``SDTX_DEVICE_TYPE()`` macro can be used to determine the EC device
+type. This can be one of
+
+* ``SDTX_DEVICE_TYPE_HID``, for Surface Aggregator Module over HID, and
+
+* ``SDTX_DEVICE_TYPE_SSH``, for Surface Aggregator Module over Surface Serial
+ Hub.
+
+Note that currently only the ``SSH`` type EC is supported, however ``HID``
+type is reserved for future use.
+
+Structures and Enums
+--------------------
+
+.. kernel-doc:: include/uapi/linux/surface_aggregator/dtx.h
+
+API Users
+=========
+
+A user-space daemon utilizing this API can be found at
+https://github.com/linux-surface/surface-dtx-daemon.
diff --git a/Documentation/driver-api/surface_aggregator/clients/index.rst b/Documentation/driver-api/surface_aggregator/clients/index.rst
new file mode 100644
index 0000000000..30160513af
--- /dev/null
+++ b/Documentation/driver-api/surface_aggregator/clients/index.rst
@@ -0,0 +1,23 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+===========================
+Client Driver Documentation
+===========================
+
+This is the documentation for client drivers themselves. Refer to
+Documentation/driver-api/surface_aggregator/client.rst for documentation
+on how to write client drivers.
+
+.. toctree::
+ :maxdepth: 1
+
+ cdev
+ dtx
+ san
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/surface_aggregator/clients/san.rst b/Documentation/driver-api/surface_aggregator/clients/san.rst
new file mode 100644
index 0000000000..38c2580e77
--- /dev/null
+++ b/Documentation/driver-api/surface_aggregator/clients/san.rst
@@ -0,0 +1,44 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+.. |san_client_link| replace:: :c:func:`san_client_link`
+.. |san_dgpu_notifier_register| replace:: :c:func:`san_dgpu_notifier_register`
+.. |san_dgpu_notifier_unregister| replace:: :c:func:`san_dgpu_notifier_unregister`
+
+===================
+Surface ACPI Notify
+===================
+
+The Surface ACPI Notify (SAN) device provides the bridge between ACPI and
+SAM controller. Specifically, ACPI code can execute requests and handle
+battery and thermal events via this interface. In addition to this, events
+relating to the discrete GPU (dGPU) of the Surface Book 2 can be sent from
+ACPI code (note: the Surface Book 3 uses a different method for this). The
+only currently known event sent via this interface is a dGPU power-on
+notification. While this driver handles the former part internally, it only
+relays the dGPU events to any other driver interested via its public API and
+does not handle them.
+
+The public interface of this driver is split into two parts: Client
+registration and notifier-block registration.
+
+A client to the SAN interface can be linked as consumer to the SAN device
+via |san_client_link|. This can be used to ensure that the a client
+receiving dGPU events does not miss any events due to the SAN interface not
+being set up as this forces the client driver to unbind once the SAN driver
+is unbound.
+
+Notifier-blocks can be registered by any device for as long as the module is
+loaded, regardless of being linked as client or not. Registration is done
+with |san_dgpu_notifier_register|. If the notifier is not needed any more, it
+should be unregistered via |san_dgpu_notifier_unregister|.
+
+Consult the API documentation below for more details.
+
+
+API Documentation
+=================
+
+.. kernel-doc:: include/linux/surface_acpi_notify.h
+
+.. kernel-doc:: drivers/platform/surface/surface_acpi_notify.c
+ :export:
diff --git a/Documentation/driver-api/surface_aggregator/index.rst b/Documentation/driver-api/surface_aggregator/index.rst
new file mode 100644
index 0000000000..6f3e109490
--- /dev/null
+++ b/Documentation/driver-api/surface_aggregator/index.rst
@@ -0,0 +1,21 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+=======================================
+Surface System Aggregator Module (SSAM)
+=======================================
+
+.. toctree::
+ :maxdepth: 2
+
+ overview
+ client
+ clients/index
+ ssh
+ internal
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/surface_aggregator/internal-api.rst b/Documentation/driver-api/surface_aggregator/internal-api.rst
new file mode 100644
index 0000000000..639a67b5a3
--- /dev/null
+++ b/Documentation/driver-api/surface_aggregator/internal-api.rst
@@ -0,0 +1,67 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+==========================
+Internal API Documentation
+==========================
+
+.. contents::
+ :depth: 2
+
+
+Packet Transport Layer
+======================
+
+.. kernel-doc:: drivers/platform/surface/aggregator/ssh_parser.h
+ :internal:
+
+.. kernel-doc:: drivers/platform/surface/aggregator/ssh_parser.c
+ :internal:
+
+.. kernel-doc:: drivers/platform/surface/aggregator/ssh_msgb.h
+ :internal:
+
+.. kernel-doc:: drivers/platform/surface/aggregator/ssh_packet_layer.h
+ :internal:
+
+.. kernel-doc:: drivers/platform/surface/aggregator/ssh_packet_layer.c
+ :internal:
+
+
+Request Transport Layer
+=======================
+
+.. kernel-doc:: drivers/platform/surface/aggregator/ssh_request_layer.h
+ :internal:
+
+.. kernel-doc:: drivers/platform/surface/aggregator/ssh_request_layer.c
+ :internal:
+
+
+Controller
+==========
+
+.. kernel-doc:: drivers/platform/surface/aggregator/controller.h
+ :internal:
+
+.. kernel-doc:: drivers/platform/surface/aggregator/controller.c
+ :internal:
+
+
+Client Device Bus
+=================
+
+.. kernel-doc:: drivers/platform/surface/aggregator/bus.c
+ :internal:
+
+
+Core
+====
+
+.. kernel-doc:: drivers/platform/surface/aggregator/core.c
+ :internal:
+
+
+Trace Helpers
+=============
+
+.. kernel-doc:: drivers/platform/surface/aggregator/trace.h
diff --git a/Documentation/driver-api/surface_aggregator/internal.rst b/Documentation/driver-api/surface_aggregator/internal.rst
new file mode 100644
index 0000000000..8c7c80c9f4
--- /dev/null
+++ b/Documentation/driver-api/surface_aggregator/internal.rst
@@ -0,0 +1,578 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+.. |ssh_ptl| replace:: :c:type:`struct ssh_ptl <ssh_ptl>`
+.. |ssh_ptl_submit| replace:: :c:func:`ssh_ptl_submit`
+.. |ssh_ptl_cancel| replace:: :c:func:`ssh_ptl_cancel`
+.. |ssh_ptl_shutdown| replace:: :c:func:`ssh_ptl_shutdown`
+.. |ssh_ptl_rx_rcvbuf| replace:: :c:func:`ssh_ptl_rx_rcvbuf`
+.. |ssh_rtl| replace:: :c:type:`struct ssh_rtl <ssh_rtl>`
+.. |ssh_rtl_submit| replace:: :c:func:`ssh_rtl_submit`
+.. |ssh_rtl_cancel| replace:: :c:func:`ssh_rtl_cancel`
+.. |ssh_rtl_shutdown| replace:: :c:func:`ssh_rtl_shutdown`
+.. |ssh_packet| replace:: :c:type:`struct ssh_packet <ssh_packet>`
+.. |ssh_packet_get| replace:: :c:func:`ssh_packet_get`
+.. |ssh_packet_put| replace:: :c:func:`ssh_packet_put`
+.. |ssh_packet_ops| replace:: :c:type:`struct ssh_packet_ops <ssh_packet_ops>`
+.. |ssh_packet_base_priority| replace:: :c:type:`enum ssh_packet_base_priority <ssh_packet_base_priority>`
+.. |ssh_packet_flags| replace:: :c:type:`enum ssh_packet_flags <ssh_packet_flags>`
+.. |SSH_PACKET_PRIORITY| replace:: :c:func:`SSH_PACKET_PRIORITY`
+.. |ssh_frame| replace:: :c:type:`struct ssh_frame <ssh_frame>`
+.. |ssh_command| replace:: :c:type:`struct ssh_command <ssh_command>`
+.. |ssh_request| replace:: :c:type:`struct ssh_request <ssh_request>`
+.. |ssh_request_get| replace:: :c:func:`ssh_request_get`
+.. |ssh_request_put| replace:: :c:func:`ssh_request_put`
+.. |ssh_request_ops| replace:: :c:type:`struct ssh_request_ops <ssh_request_ops>`
+.. |ssh_request_init| replace:: :c:func:`ssh_request_init`
+.. |ssh_request_flags| replace:: :c:type:`enum ssh_request_flags <ssh_request_flags>`
+.. |ssam_controller| replace:: :c:type:`struct ssam_controller <ssam_controller>`
+.. |ssam_device| replace:: :c:type:`struct ssam_device <ssam_device>`
+.. |ssam_device_driver| replace:: :c:type:`struct ssam_device_driver <ssam_device_driver>`
+.. |ssam_client_bind| replace:: :c:func:`ssam_client_bind`
+.. |ssam_client_link| replace:: :c:func:`ssam_client_link`
+.. |ssam_request_sync| replace:: :c:type:`struct ssam_request_sync <ssam_request_sync>`
+.. |ssam_event_registry| replace:: :c:type:`struct ssam_event_registry <ssam_event_registry>`
+.. |ssam_event_id| replace:: :c:type:`struct ssam_event_id <ssam_event_id>`
+.. |ssam_nf| replace:: :c:type:`struct ssam_nf <ssam_nf>`
+.. |ssam_nf_refcount_inc| replace:: :c:func:`ssam_nf_refcount_inc`
+.. |ssam_nf_refcount_dec| replace:: :c:func:`ssam_nf_refcount_dec`
+.. |ssam_notifier_register| replace:: :c:func:`ssam_notifier_register`
+.. |ssam_notifier_unregister| replace:: :c:func:`ssam_notifier_unregister`
+.. |ssam_cplt| replace:: :c:type:`struct ssam_cplt <ssam_cplt>`
+.. |ssam_event_queue| replace:: :c:type:`struct ssam_event_queue <ssam_event_queue>`
+.. |ssam_request_sync_submit| replace:: :c:func:`ssam_request_sync_submit`
+
+=====================
+Core Driver Internals
+=====================
+
+Architectural overview of the Surface System Aggregator Module (SSAM) core
+and Surface Serial Hub (SSH) driver. For the API documentation, refer to:
+
+.. toctree::
+ :maxdepth: 2
+
+ internal-api
+
+
+Overview
+========
+
+The SSAM core implementation is structured in layers, somewhat following the
+SSH protocol structure:
+
+Lower-level packet transport is implemented in the *packet transport layer
+(PTL)*, directly building on top of the serial device (serdev)
+infrastructure of the kernel. As the name indicates, this layer deals with
+the packet transport logic and handles things like packet validation, packet
+acknowledgment (ACKing), packet (retransmission) timeouts, and relaying
+packet payloads to higher-level layers.
+
+Above this sits the *request transport layer (RTL)*. This layer is centered
+around command-type packet payloads, i.e. requests (sent from host to EC),
+responses of the EC to those requests, and events (sent from EC to host).
+It, specifically, distinguishes events from request responses, matches
+responses to their corresponding requests, and implements request timeouts.
+
+The *controller* layer is building on top of this and essentially decides
+how request responses and, especially, events are dealt with. It provides an
+event notifier system, handles event activation/deactivation, provides a
+workqueue for event and asynchronous request completion, and also manages
+the message counters required for building command messages (``SEQ``,
+``RQID``). This layer basically provides a fundamental interface to the SAM
+EC for use in other kernel drivers.
+
+While the controller layer already provides an interface for other kernel
+drivers, the client *bus* extends this interface to provide support for
+native SSAM devices, i.e. devices that are not defined in ACPI and not
+implemented as platform devices, via |ssam_device| and |ssam_device_driver|
+simplify management of client devices and client drivers.
+
+Refer to Documentation/driver-api/surface_aggregator/client.rst for
+documentation regarding the client device/driver API and interface options
+for other kernel drivers. It is recommended to familiarize oneself with
+that chapter and the Documentation/driver-api/surface_aggregator/ssh.rst
+before continuing with the architectural overview below.
+
+
+Packet Transport Layer
+======================
+
+The packet transport layer is represented via |ssh_ptl| and is structured
+around the following key concepts:
+
+Packets
+-------
+
+Packets are the fundamental transmission unit of the SSH protocol. They are
+managed by the packet transport layer, which is essentially the lowest layer
+of the driver and is built upon by other components of the SSAM core.
+Packets to be transmitted by the SSAM core are represented via |ssh_packet|
+(in contrast, packets received by the core do not have any specific
+structure and are managed entirely via the raw |ssh_frame|).
+
+This structure contains the required fields to manage the packet inside the
+transport layer, as well as a reference to the buffer containing the data to
+be transmitted (i.e. the message wrapped in |ssh_frame|). Most notably, it
+contains an internal reference count, which is used for managing its
+lifetime (accessible via |ssh_packet_get| and |ssh_packet_put|). When this
+counter reaches zero, the ``release()`` callback provided to the packet via
+its |ssh_packet_ops| reference is executed, which may then deallocate the
+packet or its enclosing structure (e.g. |ssh_request|).
+
+In addition to the ``release`` callback, the |ssh_packet_ops| reference also
+provides a ``complete()`` callback, which is run once the packet has been
+completed and provides the status of this completion, i.e. zero on success
+or a negative errno value in case of an error. Once the packet has been
+submitted to the packet transport layer, the ``complete()`` callback is
+always guaranteed to be executed before the ``release()`` callback, i.e. the
+packet will always be completed, either successfully, with an error, or due
+to cancellation, before it will be released.
+
+The state of a packet is managed via its ``state`` flags
+(|ssh_packet_flags|), which also contains the packet type. In particular,
+the following bits are noteworthy:
+
+* ``SSH_PACKET_SF_LOCKED_BIT``: This bit is set when completion, either
+ through error or success, is imminent. It indicates that no further
+ references of the packet should be taken and any existing references
+ should be dropped as soon as possible. The process setting this bit is
+ responsible for removing any references to this packet from the packet
+ queue and pending set.
+
+* ``SSH_PACKET_SF_COMPLETED_BIT``: This bit is set by the process running the
+ ``complete()`` callback and is used to ensure that this callback only runs
+ once.
+
+* ``SSH_PACKET_SF_QUEUED_BIT``: This bit is set when the packet is queued on
+ the packet queue and cleared when it is dequeued.
+
+* ``SSH_PACKET_SF_PENDING_BIT``: This bit is set when the packet is added to
+ the pending set and cleared when it is removed from it.
+
+Packet Queue
+------------
+
+The packet queue is the first of the two fundamental collections in the
+packet transport layer. It is a priority queue, with priority of the
+respective packets based on the packet type (major) and number of tries
+(minor). See |SSH_PACKET_PRIORITY| for more details on the priority value.
+
+All packets to be transmitted by the transport layer must be submitted to
+this queue via |ssh_ptl_submit|. Note that this includes control packets
+sent by the transport layer itself. Internally, data packets can be
+re-submitted to this queue due to timeouts or NAK packets sent by the EC.
+
+Pending Set
+-----------
+
+The pending set is the second of the two fundamental collections in the
+packet transport layer. It stores references to packets that have already
+been transmitted, but wait for acknowledgment (e.g. the corresponding ACK
+packet) by the EC.
+
+Note that a packet may both be pending and queued if it has been
+re-submitted due to a packet acknowledgment timeout or NAK. On such a
+re-submission, packets are not removed from the pending set.
+
+Transmitter Thread
+------------------
+
+The transmitter thread is responsible for most of the actual work regarding
+packet transmission. In each iteration, it (waits for and) checks if the
+next packet on the queue (if any) can be transmitted and, if so, removes it
+from the queue and increments its counter for the number of transmission
+attempts, i.e. tries. If the packet is sequenced, i.e. requires an ACK by
+the EC, the packet is added to the pending set. Next, the packet's data is
+submitted to the serdev subsystem. In case of an error or timeout during
+this submission, the packet is completed by the transmitter thread with the
+status value of the callback set accordingly. In case the packet is
+unsequenced, i.e. does not require an ACK by the EC, the packet is completed
+with success on the transmitter thread.
+
+Transmission of sequenced packets is limited by the number of concurrently
+pending packets, i.e. a limit on how many packets may be waiting for an ACK
+from the EC in parallel. This limit is currently set to one (see
+Documentation/driver-api/surface_aggregator/ssh.rst for the reasoning behind
+this). Control packets (i.e. ACK and NAK) can always be transmitted.
+
+Receiver Thread
+---------------
+
+Any data received from the EC is put into a FIFO buffer for further
+processing. This processing happens on the receiver thread. The receiver
+thread parses and validates the received message into its |ssh_frame| and
+corresponding payload. It prepares and submits the necessary ACK (and on
+validation error or invalid data NAK) packets for the received messages.
+
+This thread also handles further processing, such as matching ACK messages
+to the corresponding pending packet (via sequence ID) and completing it, as
+well as initiating re-submission of all currently pending packets on
+receival of a NAK message (re-submission in case of a NAK is similar to
+re-submission due to timeout, see below for more details on that). Note that
+the successful completion of a sequenced packet will always run on the
+receiver thread (whereas any failure-indicating completion will run on the
+process where the failure occurred).
+
+Any payload data is forwarded via a callback to the next upper layer, i.e.
+the request transport layer.
+
+Timeout Reaper
+--------------
+
+The packet acknowledgment timeout is a per-packet timeout for sequenced
+packets, started when the respective packet begins (re-)transmission (i.e.
+this timeout is armed once per transmission attempt on the transmitter
+thread). It is used to trigger re-submission or, when the number of tries
+has been exceeded, cancellation of the packet in question.
+
+This timeout is handled via a dedicated reaper task, which is essentially a
+work item (re-)scheduled to run when the next packet is set to time out. The
+work item then checks the set of pending packets for any packets that have
+exceeded the timeout and, if there are any remaining packets, re-schedules
+itself to the next appropriate point in time.
+
+If a timeout has been detected by the reaper, the packet will either be
+re-submitted if it still has some remaining tries left, or completed with
+``-ETIMEDOUT`` as status if not. Note that re-submission, in this case and
+triggered by receival of a NAK, means that the packet is added to the queue
+with a now incremented number of tries, yielding a higher priority. The
+timeout for the packet will be disabled until the next transmission attempt
+and the packet remains on the pending set.
+
+Note that due to transmission and packet acknowledgment timeouts, the packet
+transport layer is always guaranteed to make progress, if only through
+timing out packets, and will never fully block.
+
+Concurrency and Locking
+-----------------------
+
+There are two main locks in the packet transport layer: One guarding access
+to the packet queue and one guarding access to the pending set. These
+collections may only be accessed and modified under the respective lock. If
+access to both collections is needed, the pending lock must be acquired
+before the queue lock to avoid deadlocks.
+
+In addition to guarding the collections, after initial packet submission
+certain packet fields may only be accessed under one of the locks.
+Specifically, the packet priority must only be accessed while holding the
+queue lock and the packet timestamp must only be accessed while holding the
+pending lock.
+
+Other parts of the packet transport layer are guarded independently. State
+flags are managed by atomic bit operations and, if necessary, memory
+barriers. Modifications to the timeout reaper work item and expiration date
+are guarded by their own lock.
+
+The reference of the packet to the packet transport layer (``ptl``) is
+somewhat special. It is either set when the upper layer request is submitted
+or, if there is none, when the packet is first submitted. After it is set,
+it will not change its value. Functions that may run concurrently with
+submission, i.e. cancellation, can not rely on the ``ptl`` reference to be
+set. Access to it in these functions is guarded by ``READ_ONCE()``, whereas
+setting ``ptl`` is equally guarded with ``WRITE_ONCE()`` for symmetry.
+
+Some packet fields may be read outside of the respective locks guarding
+them, specifically priority and state for tracing. In those cases, proper
+access is ensured by employing ``WRITE_ONCE()`` and ``READ_ONCE()``. Such
+read-only access is only allowed when stale values are not critical.
+
+With respect to the interface for higher layers, packet submission
+(|ssh_ptl_submit|), packet cancellation (|ssh_ptl_cancel|), data receival
+(|ssh_ptl_rx_rcvbuf|), and layer shutdown (|ssh_ptl_shutdown|) may always be
+executed concurrently with respect to each other. Note that packet
+submission may not run concurrently with itself for the same packet.
+Equally, shutdown and data receival may also not run concurrently with
+themselves (but may run concurrently with each other).
+
+
+Request Transport Layer
+=======================
+
+The request transport layer is represented via |ssh_rtl| and builds on top
+of the packet transport layer. It deals with requests, i.e. SSH packets sent
+by the host containing a |ssh_command| as frame payload. This layer
+separates responses to requests from events, which are also sent by the EC
+via a |ssh_command| payload. While responses are handled in this layer,
+events are relayed to the next upper layer, i.e. the controller layer, via
+the corresponding callback. The request transport layer is structured around
+the following key concepts:
+
+Request
+-------
+
+Requests are packets with a command-type payload, sent from host to EC to
+query data from or trigger an action on it (or both simultaneously). They
+are represented by |ssh_request|, wrapping the underlying |ssh_packet|
+storing its message data (i.e. SSH frame with command payload). Note that
+all top-level representations, e.g. |ssam_request_sync| are built upon this
+struct.
+
+As |ssh_request| extends |ssh_packet|, its lifetime is also managed by the
+reference counter inside the packet struct (which can be accessed via
+|ssh_request_get| and |ssh_request_put|). Once the counter reaches zero, the
+``release()`` callback of the |ssh_request_ops| reference of the request is
+called.
+
+Requests can have an optional response that is equally sent via a SSH
+message with command-type payload (from EC to host). The party constructing
+the request must know if a response is expected and mark this in the request
+flags provided to |ssh_request_init|, so that the request transport layer
+can wait for this response.
+
+Similar to |ssh_packet|, |ssh_request| also has a ``complete()`` callback
+provided via its request ops reference and is guaranteed to be completed
+before it is released once it has been submitted to the request transport
+layer via |ssh_rtl_submit|. For a request without a response, successful
+completion will occur once the underlying packet has been successfully
+transmitted by the packet transport layer (i.e. from within the packet
+completion callback). For a request with response, successful completion
+will occur once the response has been received and matched to the request
+via its request ID (which happens on the packet layer's data-received
+callback running on the receiver thread). If the request is completed with
+an error, the status value will be set to the corresponding (negative) errno
+value.
+
+The state of a request is again managed via its ``state`` flags
+(|ssh_request_flags|), which also encode the request type. In particular,
+the following bits are noteworthy:
+
+* ``SSH_REQUEST_SF_LOCKED_BIT``: This bit is set when completion, either
+ through error or success, is imminent. It indicates that no further
+ references of the request should be taken and any existing references
+ should be dropped as soon as possible. The process setting this bit is
+ responsible for removing any references to this request from the request
+ queue and pending set.
+
+* ``SSH_REQUEST_SF_COMPLETED_BIT``: This bit is set by the process running the
+ ``complete()`` callback and is used to ensure that this callback only runs
+ once.
+
+* ``SSH_REQUEST_SF_QUEUED_BIT``: This bit is set when the request is queued on
+ the request queue and cleared when it is dequeued.
+
+* ``SSH_REQUEST_SF_PENDING_BIT``: This bit is set when the request is added to
+ the pending set and cleared when it is removed from it.
+
+Request Queue
+-------------
+
+The request queue is the first of the two fundamental collections in the
+request transport layer. In contrast to the packet queue of the packet
+transport layer, it is not a priority queue and the simple first come first
+serve principle applies.
+
+All requests to be transmitted by the request transport layer must be
+submitted to this queue via |ssh_rtl_submit|. Once submitted, requests may
+not be re-submitted, and will not be re-submitted automatically on timeout.
+Instead, the request is completed with a timeout error. If desired, the
+caller can create and submit a new request for another try, but it must not
+submit the same request again.
+
+Pending Set
+-----------
+
+The pending set is the second of the two fundamental collections in the
+request transport layer. This collection stores references to all pending
+requests, i.e. requests awaiting a response from the EC (similar to what the
+pending set of the packet transport layer does for packets).
+
+Transmitter Task
+----------------
+
+The transmitter task is scheduled when a new request is available for
+transmission. It checks if the next request on the request queue can be
+transmitted and, if so, submits its underlying packet to the packet
+transport layer. This check ensures that only a limited number of
+requests can be pending, i.e. waiting for a response, at the same time. If
+the request requires a response, the request is added to the pending set
+before its packet is submitted.
+
+Packet Completion Callback
+--------------------------
+
+The packet completion callback is executed once the underlying packet of a
+request has been completed. In case of an error completion, the
+corresponding request is completed with the error value provided in this
+callback.
+
+On successful packet completion, further processing depends on the request.
+If the request expects a response, it is marked as transmitted and the
+request timeout is started. If the request does not expect a response, it is
+completed with success.
+
+Data-Received Callback
+----------------------
+
+The data received callback notifies the request transport layer of data
+being received by the underlying packet transport layer via a data-type
+frame. In general, this is expected to be a command-type payload.
+
+If the request ID of the command is one of the request IDs reserved for
+events (one to ``SSH_NUM_EVENTS``, inclusively), it is forwarded to the
+event callback registered in the request transport layer. If the request ID
+indicates a response to a request, the respective request is looked up in
+the pending set and, if found and marked as transmitted, completed with
+success.
+
+Timeout Reaper
+--------------
+
+The request-response-timeout is a per-request timeout for requests expecting
+a response. It is used to ensure that a request does not wait indefinitely
+on a response from the EC and is started after the underlying packet has
+been successfully completed.
+
+This timeout is, similar to the packet acknowledgment timeout on the packet
+transport layer, handled via a dedicated reaper task. This task is
+essentially a work-item (re-)scheduled to run when the next request is set
+to time out. The work item then scans the set of pending requests for any
+requests that have timed out and completes them with ``-ETIMEDOUT`` as
+status. Requests will not be re-submitted automatically. Instead, the issuer
+of the request must construct and submit a new request, if so desired.
+
+Note that this timeout, in combination with packet transmission and
+acknowledgment timeouts, guarantees that the request layer will always make
+progress, even if only through timing out packets, and never fully block.
+
+Concurrency and Locking
+-----------------------
+
+Similar to the packet transport layer, there are two main locks in the
+request transport layer: One guarding access to the request queue and one
+guarding access to the pending set. These collections may only be accessed
+and modified under the respective lock.
+
+Other parts of the request transport layer are guarded independently. State
+flags are (again) managed by atomic bit operations and, if necessary, memory
+barriers. Modifications to the timeout reaper work item and expiration date
+are guarded by their own lock.
+
+Some request fields may be read outside of the respective locks guarding
+them, specifically the state for tracing. In those cases, proper access is
+ensured by employing ``WRITE_ONCE()`` and ``READ_ONCE()``. Such read-only
+access is only allowed when stale values are not critical.
+
+With respect to the interface for higher layers, request submission
+(|ssh_rtl_submit|), request cancellation (|ssh_rtl_cancel|), and layer
+shutdown (|ssh_rtl_shutdown|) may always be executed concurrently with
+respect to each other. Note that request submission may not run concurrently
+with itself for the same request (and also may only be called once per
+request). Equally, shutdown may also not run concurrently with itself.
+
+
+Controller Layer
+================
+
+The controller layer extends on the request transport layer to provide an
+easy-to-use interface for client drivers. It is represented by
+|ssam_controller| and the SSH driver. While the lower level transport layers
+take care of transmitting and handling packets and requests, the controller
+layer takes on more of a management role. Specifically, it handles device
+initialization, power management, and event handling, including event
+delivery and registration via the (event) completion system (|ssam_cplt|).
+
+Event Registration
+------------------
+
+In general, an event (or rather a class of events) has to be explicitly
+requested by the host before the EC will send it (HID input events seem to
+be the exception). This is done via an event-enable request (similarly,
+events should be disabled via an event-disable request once no longer
+desired).
+
+The specific request used to enable (or disable) an event is given via an
+event registry, i.e. the governing authority of this event (so to speak),
+represented by |ssam_event_registry|. As parameters to this request, the
+target category and, depending on the event registry, instance ID of the
+event to be enabled must be provided. This (optional) instance ID must be
+zero if the registry does not use it. Together, target category and instance
+ID form the event ID, represented by |ssam_event_id|. In short, both, event
+registry and event ID, are required to uniquely identify a respective class
+of events.
+
+Note that a further *request ID* parameter must be provided for the
+enable-event request. This parameter does not influence the class of events
+being enabled, but instead is set as the request ID (RQID) on each event of
+this class sent by the EC. It is used to identify events (as a limited
+number of request IDs is reserved for use in events only, specifically one
+to ``SSH_NUM_EVENTS`` inclusively) and also map events to their specific
+class. Currently, the controller always sets this parameter to the target
+category specified in |ssam_event_id|.
+
+As multiple client drivers may rely on the same (or overlapping) classes of
+events and enable/disable calls are strictly binary (i.e. on/off), the
+controller has to manage access to these events. It does so via reference
+counting, storing the counter inside an RB-tree based mapping with event
+registry and ID as key (there is no known list of valid event registry and
+event ID combinations). See |ssam_nf|, |ssam_nf_refcount_inc|, and
+|ssam_nf_refcount_dec| for details.
+
+This management is done together with notifier registration (described in
+the next section) via the top-level |ssam_notifier_register| and
+|ssam_notifier_unregister| functions.
+
+Event Delivery
+--------------
+
+To receive events, a client driver has to register an event notifier via
+|ssam_notifier_register|. This increments the reference counter for that
+specific class of events (as detailed in the previous section), enables the
+class on the EC (if it has not been enabled already), and installs the
+provided notifier callback.
+
+Notifier callbacks are stored in lists, with one (RCU) list per target
+category (provided via the event ID; NB: there is a fixed known number of
+target categories). There is no known association from the combination of
+event registry and event ID to the command data (target ID, target category,
+command ID, and instance ID) that can be provided by an event class, apart
+from target category and instance ID given via the event ID.
+
+Note that due to the way notifiers are (or rather have to be) stored, client
+drivers may receive events that they have not requested and need to account
+for them. Specifically, they will, by default, receive all events from the
+same target category. To simplify dealing with this, filtering of events by
+target ID (provided via the event registry) and instance ID (provided via
+the event ID) can be requested when registering a notifier. This filtering
+is applied when iterating over the notifiers at the time they are executed.
+
+All notifier callbacks are executed on a dedicated workqueue, the so-called
+completion workqueue. After an event has been received via the callback
+installed in the request layer (running on the receiver thread of the packet
+transport layer), it will be put on its respective event queue
+(|ssam_event_queue|). From this event queue the completion work item of that
+queue (running on the completion workqueue) will pick up the event and
+execute the notifier callback. This is done to avoid blocking on the
+receiver thread.
+
+There is one event queue per combination of target ID and target category.
+This is done to ensure that notifier callbacks are executed in sequence for
+events of the same target ID and target category. Callbacks can be executed
+in parallel for events with a different combination of target ID and target
+category.
+
+Concurrency and Locking
+-----------------------
+
+Most of the concurrency related safety guarantees of the controller are
+provided by the lower-level request transport layer. In addition to this,
+event (un-)registration is guarded by its own lock.
+
+Access to the controller state is guarded by the state lock. This lock is a
+read/write semaphore. The reader part can be used to ensure that the state
+does not change while functions depending on the state to stay the same
+(e.g. |ssam_notifier_register|, |ssam_notifier_unregister|,
+|ssam_request_sync_submit|, and derivatives) are executed and this guarantee
+is not already provided otherwise (e.g. through |ssam_client_bind| or
+|ssam_client_link|). The writer part guards any transitions that will change
+the state, i.e. initialization, destruction, suspension, and resumption.
+
+The controller state may be accessed (read-only) outside the state lock for
+smoke-testing against invalid API usage (e.g. in |ssam_request_sync_submit|).
+Note that such checks are not supposed to (and will not) protect against all
+invalid usages, but rather aim to help catch them. In those cases, proper
+variable access is ensured by employing ``WRITE_ONCE()`` and ``READ_ONCE()``.
+
+Assuming any preconditions on the state not changing have been satisfied,
+all non-initialization and non-shutdown functions may run concurrently with
+each other. This includes |ssam_notifier_register|, |ssam_notifier_unregister|,
+|ssam_request_sync_submit|, as well as all functions building on top of those.
diff --git a/Documentation/driver-api/surface_aggregator/overview.rst b/Documentation/driver-api/surface_aggregator/overview.rst
new file mode 100644
index 0000000000..26415e1ab7
--- /dev/null
+++ b/Documentation/driver-api/surface_aggregator/overview.rst
@@ -0,0 +1,79 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+========
+Overview
+========
+
+The Surface/System Aggregator Module (SAM, SSAM) is an (arguably *the*)
+embedded controller (EC) on Microsoft Surface devices. It has been originally
+introduced on 4th generation devices (Surface Pro 4, Surface Book 1), but
+its responsibilities and feature-set have since been expanded significantly
+with the following generations.
+
+
+Features and Integration
+========================
+
+Not much is currently known about SAM on 4th generation devices (Surface Pro
+4, Surface Book 1), due to the use of a different communication interface
+between host and EC (as detailed below). On 5th (Surface Pro 2017, Surface
+Book 2, Surface Laptop 1) and later generation devices, SAM is responsible
+for providing battery information (both current status and static values,
+such as maximum capacity etc.), as well as an assortment of temperature
+sensors (e.g. skin temperature) and cooling/performance-mode setting to the
+host. On the Surface Book 2, specifically, it additionally provides an
+interface for properly handling clipboard detachment (i.e. separating the
+display part from the keyboard part of the device), on the Surface Laptop 1
+and 2 it is required for keyboard HID input. This HID subsystem has been
+restructured for 7th generation devices and on those, specifically Surface
+Laptop 3 and Surface Book 3, is responsible for all major HID input (i.e.
+keyboard and touchpad).
+
+While features have not changed much on a coarse level since the 5th
+generation, internal interfaces have undergone some rather large changes. On
+5th and 6th generation devices, both battery and temperature information is
+exposed to ACPI via a shim driver (referred to as Surface ACPI Notify, or
+SAN), translating ACPI generic serial bus write-/read-accesses to SAM
+requests. On 7th generation devices, this additional layer is gone and these
+devices require a driver hooking directly into the SAM interface. Equally,
+on newer generations, less devices are declared in ACPI, making them a bit
+harder to discover and requiring us to hard-code a sort of device registry.
+Due to this, a SSAM bus and subsystem with client devices
+(:c:type:`struct ssam_device <ssam_device>`) has been implemented.
+
+
+Communication
+=============
+
+The type of communication interface between host and EC depends on the
+generation of the Surface device. On 4th generation devices, host and EC
+communicate via HID, specifically using a HID-over-I2C device, whereas on
+5th and later generations, communication takes place via a USART serial
+device. In accordance to the drivers found on other operating systems, we
+refer to the serial device and its driver as Surface Serial Hub (SSH). When
+needed, we differentiate between both types of SAM by referring to them as
+SAM-over-SSH and SAM-over-HID.
+
+Currently, this subsystem only supports SAM-over-SSH. The SSH communication
+interface is described in more detail below. The HID interface has not been
+reverse engineered yet and it is, at the moment, unclear how many (and
+which) concepts of the SSH interface detailed below can be transferred to
+it.
+
+Surface Serial Hub
+------------------
+
+As already elaborated above, the Surface Serial Hub (SSH) is the
+communication interface for SAM on 5th- and all later-generation Surface
+devices. On the highest level, communication can be separated into two main
+types: Requests, messages sent from host to EC that may trigger a direct
+response from the EC (explicitly associated with the request), and events
+(sometimes also referred to as notifications), sent from EC to host without
+being a direct response to a previous request. We may also refer to requests
+without response as commands. In general, events need to be enabled via one
+of multiple dedicated requests before they are sent by the EC.
+
+See Documentation/driver-api/surface_aggregator/ssh.rst for a
+more technical protocol documentation and
+Documentation/driver-api/surface_aggregator/internal.rst for an
+overview of the internal driver architecture.
diff --git a/Documentation/driver-api/surface_aggregator/ssh.rst b/Documentation/driver-api/surface_aggregator/ssh.rst
new file mode 100644
index 0000000000..b955b67383
--- /dev/null
+++ b/Documentation/driver-api/surface_aggregator/ssh.rst
@@ -0,0 +1,346 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+.. |u8| replace:: :c:type:`u8 <u8>`
+.. |u16| replace:: :c:type:`u16 <u16>`
+.. |TYPE| replace:: ``TYPE``
+.. |LEN| replace:: ``LEN``
+.. |SEQ| replace:: ``SEQ``
+.. |SYN| replace:: ``SYN``
+.. |NAK| replace:: ``NAK``
+.. |ACK| replace:: ``ACK``
+.. |DATA| replace:: ``DATA``
+.. |DATA_SEQ| replace:: ``DATA_SEQ``
+.. |DATA_NSQ| replace:: ``DATA_NSQ``
+.. |TC| replace:: ``TC``
+.. |TID| replace:: ``TID``
+.. |SID| replace:: ``SID``
+.. |IID| replace:: ``IID``
+.. |RQID| replace:: ``RQID``
+.. |CID| replace:: ``CID``
+
+===========================
+Surface Serial Hub Protocol
+===========================
+
+The Surface Serial Hub (SSH) is the central communication interface for the
+embedded Surface Aggregator Module controller (SAM or EC), found on newer
+Surface generations. We will refer to this protocol and interface as
+SAM-over-SSH, as opposed to SAM-over-HID for the older generations.
+
+On Surface devices with SAM-over-SSH, SAM is connected to the host via UART
+and defined in ACPI as device with ID ``MSHW0084``. On these devices,
+significant functionality is provided via SAM, including access to battery
+and power information and events, thermal read-outs and events, and many
+more. For Surface Laptops, keyboard input is handled via HID directed
+through SAM, on the Surface Laptop 3 and Surface Book 3 this also includes
+touchpad input.
+
+Note that the standard disclaimer for this subsystem also applies to this
+document: All of this has been reverse-engineered and may thus be erroneous
+and/or incomplete.
+
+All CRCs used in the following are two-byte ``crc_ccitt_false(0xffff, ...)``.
+All multi-byte values are little-endian, there is no implicit padding between
+values.
+
+
+SSH Packet Protocol: Definitions
+================================
+
+The fundamental communication unit of the SSH protocol is a frame
+(:c:type:`struct ssh_frame <ssh_frame>`). A frame consists of the following
+fields, packed together and in order:
+
+.. flat-table:: SSH Frame
+ :widths: 1 1 4
+ :header-rows: 1
+
+ * - Field
+ - Type
+ - Description
+
+ * - |TYPE|
+ - |u8|
+ - Type identifier of the frame.
+
+ * - |LEN|
+ - |u16|
+ - Length of the payload associated with the frame.
+
+ * - |SEQ|
+ - |u8|
+ - Sequence ID (see explanation below).
+
+Each frame structure is followed by a CRC over this structure. The CRC over
+the frame structure (|TYPE|, |LEN|, and |SEQ| fields) is placed directly
+after the frame structure and before the payload. The payload is followed by
+its own CRC (over all payload bytes). If the payload is not present (i.e.
+the frame has ``LEN=0``), the CRC of the payload is still present and will
+evaluate to ``0xffff``. The |LEN| field does not include any of the CRCs, it
+equals the number of bytes between the CRC of the frame and the CRC of the
+payload.
+
+Additionally, the following fixed two-byte sequences are used:
+
+.. flat-table:: SSH Byte Sequences
+ :widths: 1 1 4
+ :header-rows: 1
+
+ * - Name
+ - Value
+ - Description
+
+ * - |SYN|
+ - ``[0xAA, 0x55]``
+ - Synchronization bytes.
+
+A message consists of |SYN|, followed by the frame (|TYPE|, |LEN|, |SEQ| and
+CRC) and, if specified in the frame (i.e. ``LEN > 0``), payload bytes,
+followed finally, regardless if the payload is present, the payload CRC. The
+messages corresponding to an exchange are, in part, identified by having the
+same sequence ID (|SEQ|), stored inside the frame (more on this in the next
+section). The sequence ID is a wrapping counter.
+
+A frame can have the following types
+(:c:type:`enum ssh_frame_type <ssh_frame_type>`):
+
+.. flat-table:: SSH Frame Types
+ :widths: 1 1 4
+ :header-rows: 1
+
+ * - Name
+ - Value
+ - Short Description
+
+ * - |NAK|
+ - ``0x04``
+ - Sent on error in previously received message.
+
+ * - |ACK|
+ - ``0x40``
+ - Sent to acknowledge receival of |DATA| frame.
+
+ * - |DATA_SEQ|
+ - ``0x80``
+ - Sent to transfer data. Sequenced.
+
+ * - |DATA_NSQ|
+ - ``0x00``
+ - Same as |DATA_SEQ|, but does not need to be ACKed.
+
+Both |NAK|- and |ACK|-type frames are used to control flow of messages and
+thus do not carry a payload. |DATA_SEQ|- and |DATA_NSQ|-type frames on the
+other hand must carry a payload. The flow sequence and interaction of
+different frame types will be described in more depth in the next section.
+
+
+SSH Packet Protocol: Flow Sequence
+==================================
+
+Each exchange begins with |SYN|, followed by a |DATA_SEQ|- or
+|DATA_NSQ|-type frame, followed by its CRC, payload, and payload CRC. In
+case of a |DATA_NSQ|-type frame, the exchange is then finished. In case of a
+|DATA_SEQ|-type frame, the receiving party has to acknowledge receival of
+the frame by responding with a message containing an |ACK|-type frame with
+the same sequence ID of the |DATA| frame. In other words, the sequence ID of
+the |ACK| frame specifies the |DATA| frame to be acknowledged. In case of an
+error, e.g. an invalid CRC, the receiving party responds with a message
+containing an |NAK|-type frame. As the sequence ID of the previous data
+frame, for which an error is indicated via the |NAK| frame, cannot be relied
+upon, the sequence ID of the |NAK| frame should not be used and is set to
+zero. After receival of an |NAK| frame, the sending party should re-send all
+outstanding (non-ACKed) messages.
+
+Sequence IDs are not synchronized between the two parties, meaning that they
+are managed independently for each party. Identifying the messages
+corresponding to a single exchange thus relies on the sequence ID as well as
+the type of the message, and the context. Specifically, the sequence ID is
+used to associate an ``ACK`` with its ``DATA_SEQ``-type frame, but not
+``DATA_SEQ``- or ``DATA_NSQ``-type frames with other ``DATA``- type frames.
+
+An example exchange might look like this:
+
+::
+
+ tx: -- SYN FRAME(D) CRC(F) PAYLOAD CRC(P) -----------------------------
+ rx: ------------------------------------- SYN FRAME(A) CRC(F) CRC(P) --
+
+where both frames have the same sequence ID (``SEQ``). Here, ``FRAME(D)``
+indicates a |DATA_SEQ|-type frame, ``FRAME(A)`` an ``ACK``-type frame,
+``CRC(F)`` the CRC over the previous frame, ``CRC(P)`` the CRC over the
+previous payload. In case of an error, the exchange would look like this:
+
+::
+
+ tx: -- SYN FRAME(D) CRC(F) PAYLOAD CRC(P) -----------------------------
+ rx: ------------------------------------- SYN FRAME(N) CRC(F) CRC(P) --
+
+upon which the sender should re-send the message. ``FRAME(N)`` indicates an
+|NAK|-type frame. Note that the sequence ID of the |NAK|-type frame is fixed
+to zero. For |DATA_NSQ|-type frames, both exchanges are the same:
+
+::
+
+ tx: -- SYN FRAME(DATA_NSQ) CRC(F) PAYLOAD CRC(P) ----------------------
+ rx: -------------------------------------------------------------------
+
+Here, an error can be detected, but not corrected or indicated to the
+sending party. These exchanges are symmetric, i.e. switching ``rx`` and
+``tx`` results again in a valid exchange. Currently, no longer exchanges are
+known.
+
+
+Commands: Requests, Responses, and Events
+=========================================
+
+Commands are sent as payload inside a data frame. Currently, this is the
+only known payload type of |DATA| frames, with a payload-type value of
+``0x80`` (:c:type:`SSH_PLD_TYPE_CMD <ssh_payload_type>`).
+
+The command-type payload (:c:type:`struct ssh_command <ssh_command>`)
+consists of an eight-byte command structure, followed by optional and
+variable length command data. The length of this optional data is derived
+from the frame payload length given in the corresponding frame, i.e. it is
+``frame.len - sizeof(struct ssh_command)``. The command struct contains the
+following fields, packed together and in order:
+
+.. flat-table:: SSH Command
+ :widths: 1 1 4
+ :header-rows: 1
+
+ * - Field
+ - Type
+ - Description
+
+ * - |TYPE|
+ - |u8|
+ - Type of the payload. For commands always ``0x80``.
+
+ * - |TC|
+ - |u8|
+ - Target category.
+
+ * - |TID|
+ - |u8|
+ - Target ID for commands/messages.
+
+ * - |SID|
+ - |u8|
+ - Source ID for commands/messages.
+
+ * - |IID|
+ - |u8|
+ - Instance ID.
+
+ * - |RQID|
+ - |u16|
+ - Request ID.
+
+ * - |CID|
+ - |u8|
+ - Command ID.
+
+The command struct and data, in general, does not contain any failure
+detection mechanism (e.g. CRCs), this is solely done on the frame level.
+
+Command-type payloads are used by the host to send commands and requests to
+the EC as well as by the EC to send responses and events back to the host.
+We differentiate between requests (sent by the host), responses (sent by the
+EC in response to a request), and events (sent by the EC without a preceding
+request).
+
+Commands and events are uniquely identified by their target category
+(``TC``) and command ID (``CID``). The target category specifies a general
+category for the command (e.g. system in general, vs. battery and AC, vs.
+temperature, and so on), while the command ID specifies the command inside
+that category. Only the combination of |TC| + |CID| is unique. Additionally,
+commands have an instance ID (``IID``), which is used to differentiate
+between different sub-devices. For example ``TC=3`` ``CID=1`` is a
+request to get the temperature on a thermal sensor, where |IID| specifies
+the respective sensor. If the instance ID is not used, it should be set to
+zero. If instance IDs are used, they, in general, start with a value of one,
+whereas zero may be used for instance independent queries, if applicable. A
+response to a request should have the same target category, command ID, and
+instance ID as the corresponding request.
+
+Responses are matched to their corresponding request via the request ID
+(``RQID``) field. This is a 16 bit wrapping counter similar to the sequence
+ID on the frames. Note that the sequence ID of the frames for a
+request-response pair does not match. Only the request ID has to match.
+Frame-protocol wise these are two separate exchanges, and may even be
+separated, e.g. by an event being sent after the request but before the
+response. Not all commands produce a response, and this is not detectable by
+|TC| + |CID|. It is the responsibility of the issuing party to wait for a
+response (or signal this to the communication framework, as is done in
+SAN/ACPI via the ``SNC`` flag).
+
+Events are identified by unique and reserved request IDs. These IDs should
+not be used by the host when sending a new request. They are used on the
+host to, first, detect events and, second, match them with a registered
+event handler. Request IDs for events are chosen by the host and directed to
+the EC when setting up and enabling an event source (via the
+enable-event-source request). The EC then uses the specified request ID for
+events sent from the respective source. Note that an event should still be
+identified by its target category, command ID, and, if applicable, instance
+ID, as a single event source can send multiple different event types. In
+general, however, a single target category should map to a single reserved
+event request ID.
+
+Furthermore, requests, responses, and events have an associated target ID
+(``TID``) and source ID (``SID``). These two fields indicate where a message
+originates from (``SID``) and what the intended target of the message is
+(``TID``). Note that a response to a specific request therefore has the source
+and target IDs swapped when compared to the original request (i.e. the request
+target is the response source and the request source is the response target).
+See (:c:type:`enum ssh_request_id <ssh_request_id>`) for possible values of
+both.
+
+Note that, even though requests and events should be uniquely identifiable by
+target category and command ID alone, the EC may require specific target ID and
+instance ID values to accept a command. A command that is accepted for
+``TID=1``, for example, may not be accepted for ``TID=2`` and vice versa. While
+this may not always hold in reality, you can think of different target/source
+IDs indicating different physical ECs with potentially different feature sets.
+
+
+Limitations and Observations
+============================
+
+The protocol can, in theory, handle up to ``U8_MAX`` frames in parallel,
+with up to ``U16_MAX`` pending requests (neglecting request IDs reserved for
+events). In practice, however, this is more limited. From our testing
+(although via a python and thus a user-space program), it seems that the EC
+can handle up to four requests (mostly) reliably in parallel at a certain
+time. With five or more requests in parallel, consistent discarding of
+commands (ACKed frame but no command response) has been observed. For five
+simultaneous commands, this reproducibly resulted in one command being
+dropped and four commands being handled.
+
+However, it has also been noted that, even with three requests in parallel,
+occasional frame drops happen. Apart from this, with a limit of three
+pending requests, no dropped commands (i.e. command being dropped but frame
+carrying command being ACKed) have been observed. In any case, frames (and
+possibly also commands) should be re-sent by the host if a certain timeout
+is exceeded. This is done by the EC for frames with a timeout of one second,
+up to two re-tries (i.e. three transmissions in total). The limit of
+re-tries also applies to received NAKs, and, in a worst case scenario, can
+lead to entire messages being dropped.
+
+While this also seems to work fine for pending data frames as long as no
+transmission failures occur, implementation and handling of these seems to
+depend on the assumption that there is only one non-acknowledged data frame.
+In particular, the detection of repeated frames relies on the last sequence
+number. This means that, if a frame that has been successfully received by
+the EC is sent again, e.g. due to the host not receiving an |ACK|, the EC
+will only detect this if it has the sequence ID of the last frame received
+by the EC. As an example: Sending two frames with ``SEQ=0`` and ``SEQ=1``
+followed by a repetition of ``SEQ=0`` will not detect the second ``SEQ=0``
+frame as such, and thus execute the command in this frame each time it has
+been received, i.e. twice in this example. Sending ``SEQ=0``, ``SEQ=1`` and
+then repeating ``SEQ=1`` will detect the second ``SEQ=1`` as repetition of
+the first one and ignore it, thus executing the contained command only once.
+
+In conclusion, this suggests a limit of at most one pending un-ACKed frame
+(per party, effectively leading to synchronous communication regarding
+frames) and at most three pending commands. The limit to synchronous frame
+transfers seems to be consistent with behavior observed on Windows.
diff --git a/Documentation/driver-api/switchtec.rst b/Documentation/driver-api/switchtec.rst
new file mode 100644
index 0000000000..7611fdc53e
--- /dev/null
+++ b/Documentation/driver-api/switchtec.rst
@@ -0,0 +1,102 @@
+========================
+Linux Switchtec Support
+========================
+
+Microsemi's "Switchtec" line of PCI switch devices is already
+supported by the kernel with standard PCI switch drivers. However, the
+Switchtec device advertises a special management endpoint which
+enables some additional functionality. This includes:
+
+* Packet and Byte Counters
+* Firmware Upgrades
+* Event and Error logs
+* Querying port link status
+* Custom user firmware commands
+
+The switchtec kernel module implements this functionality.
+
+
+Interface
+=========
+
+The primary means of communicating with the Switchtec management firmware is
+through the Memory-mapped Remote Procedure Call (MRPC) interface.
+Commands are submitted to the interface with a 4-byte command
+identifier and up to 1KB of command specific data. The firmware will
+respond with a 4-byte return code and up to 1KB of command-specific
+data. The interface only processes a single command at a time.
+
+
+Userspace Interface
+===================
+
+The MRPC interface will be exposed to userspace through a simple char
+device: /dev/switchtec#, one for each management endpoint in the system.
+
+The char device has the following semantics:
+
+* A write must consist of at least 4 bytes and no more than 1028 bytes.
+ The first 4 bytes will be interpreted as the Command ID and the
+ remainder will be used as the input data. A write will send the
+ command to the firmware to begin processing.
+
+* Each write must be followed by exactly one read. Any double write will
+ produce an error and any read that doesn't follow a write will
+ produce an error.
+
+* A read will block until the firmware completes the command and return
+ the 4-byte Command Return Value plus up to 1024 bytes of output
+ data. (The length will be specified by the size parameter of the read
+ call -- reading less than 4 bytes will produce an error.)
+
+* The poll call will also be supported for userspace applications that
+ need to do other things while waiting for the command to complete.
+
+The following IOCTLs are also supported by the device:
+
+* SWITCHTEC_IOCTL_FLASH_INFO - Retrieve firmware length and number
+ of partitions in the device.
+
+* SWITCHTEC_IOCTL_FLASH_PART_INFO - Retrieve address and lengeth for
+ any specified partition in flash.
+
+* SWITCHTEC_IOCTL_EVENT_SUMMARY - Read a structure of bitmaps
+ indicating all uncleared events.
+
+* SWITCHTEC_IOCTL_EVENT_CTL - Get the current count, clear and set flags
+ for any event. This ioctl takes in a switchtec_ioctl_event_ctl struct
+ with the event_id, index and flags set (index being the partition or PFF
+ number for non-global events). It returns whether the event has
+ occurred, the number of times and any event specific data. The flags
+ can be used to clear the count or enable and disable actions to
+ happen when the event occurs.
+ By using the SWITCHTEC_IOCTL_EVENT_FLAG_EN_POLL flag,
+ you can set an event to trigger a poll command to return with
+ POLLPRI. In this way, userspace can wait for events to occur.
+
+* SWITCHTEC_IOCTL_PFF_TO_PORT and SWITCHTEC_IOCTL_PORT_TO_PFF convert
+ between PCI Function Framework number (used by the event system)
+ and Switchtec Logic Port ID and Partition number (which is more
+ user friendly).
+
+
+Non-Transparent Bridge (NTB) Driver
+===================================
+
+An NTB hardware driver is provided for the Switchtec hardware in
+ntb_hw_switchtec. Currently, it only supports switches configured with
+exactly 2 NT partitions and zero or more non-NT partitions. It also requires
+the following configuration settings:
+
+* Both NT partitions must be able to access each other's GAS spaces.
+ Thus, the bits in the GAS Access Vector under Management Settings
+ must be set to support this.
+* Kernel configuration MUST include support for NTB (CONFIG_NTB needs
+ to be set)
+
+NT EP BAR 2 will be dynamically configured as a Direct Window, and
+the configuration file does not need to configure it explicitly.
+
+Please refer to Documentation/driver-api/ntb.rst in Linux source tree for an overall
+understanding of the Linux NTB stack. ntb_hw_switchtec works as an NTB
+Hardware Driver in this stack.
diff --git a/Documentation/driver-api/sync_file.rst b/Documentation/driver-api/sync_file.rst
new file mode 100644
index 0000000000..496fb2c3b3
--- /dev/null
+++ b/Documentation/driver-api/sync_file.rst
@@ -0,0 +1,86 @@
+===================
+Sync File API Guide
+===================
+
+:Author: Gustavo Padovan <gustavo at padovan dot org>
+
+This document serves as a guide for device drivers writers on what the
+sync_file API is, and how drivers can support it. Sync file is the carrier of
+the fences(struct dma_fence) that are needed to synchronize between drivers or
+across process boundaries.
+
+The sync_file API is meant to be used to send and receive fence information
+to/from userspace. It enables userspace to do explicit fencing, where instead
+of attaching a fence to the buffer a producer driver (such as a GPU or V4L
+driver) sends the fence related to the buffer to userspace via a sync_file.
+
+The sync_file then can be sent to the consumer (DRM driver for example), that
+will not use the buffer for anything before the fence(s) signals, i.e., the
+driver that issued the fence is not using/processing the buffer anymore, so it
+signals that the buffer is ready to use. And vice-versa for the consumer ->
+producer part of the cycle.
+
+Sync files allows userspace awareness on buffer sharing synchronization between
+drivers.
+
+Sync file was originally added in the Android kernel but current Linux Desktop
+can benefit a lot from it.
+
+in-fences and out-fences
+------------------------
+
+Sync files can go either to or from userspace. When a sync_file is sent from
+the driver to userspace we call the fences it contains 'out-fences'. They are
+related to a buffer that the driver is processing or is going to process, so
+the driver creates an out-fence to be able to notify, through
+dma_fence_signal(), when it has finished using (or processing) that buffer.
+Out-fences are fences that the driver creates.
+
+On the other hand if the driver receives fence(s) through a sync_file from
+userspace we call these fence(s) 'in-fences'. Receiving in-fences means that
+we need to wait for the fence(s) to signal before using any buffer related to
+the in-fences.
+
+Creating Sync Files
+-------------------
+
+When a driver needs to send an out-fence userspace it creates a sync_file.
+
+Interface::
+
+ struct sync_file *sync_file_create(struct dma_fence *fence);
+
+The caller pass the out-fence and gets back the sync_file. That is just the
+first step, next it needs to install an fd on sync_file->file. So it gets an
+fd::
+
+ fd = get_unused_fd_flags(O_CLOEXEC);
+
+and installs it on sync_file->file::
+
+ fd_install(fd, sync_file->file);
+
+The sync_file fd now can be sent to userspace.
+
+If the creation process fail, or the sync_file needs to be released by any
+other reason fput(sync_file->file) should be used.
+
+Receiving Sync Files from Userspace
+-----------------------------------
+
+When userspace needs to send an in-fence to the driver it passes file descriptor
+of the Sync File to the kernel. The kernel can then retrieve the fences
+from it.
+
+Interface::
+
+ struct dma_fence *sync_file_get_fence(int fd);
+
+
+The returned reference is owned by the caller and must be disposed of
+afterwards using dma_fence_put(). In case of error, a NULL is returned instead.
+
+References:
+
+1. struct sync_file in include/linux/sync_file.h
+2. All interfaces mentioned above defined in include/linux/sync_file.h
diff --git a/Documentation/driver-api/target.rst b/Documentation/driver-api/target.rst
new file mode 100644
index 0000000000..c70ca25171
--- /dev/null
+++ b/Documentation/driver-api/target.rst
@@ -0,0 +1,52 @@
+=================================
+target and iSCSI Interfaces Guide
+=================================
+
+Introduction and Overview
+=========================
+
+TBD
+
+Target core device interfaces
+=============================
+
+This section is blank because no kerneldoc comments have been added to
+drivers/target/target_core_device.c.
+
+Target core transport interfaces
+================================
+
+.. kernel-doc:: drivers/target/target_core_transport.c
+ :export:
+
+Target-supported userspace I/O
+==============================
+
+.. kernel-doc:: drivers/target/target_core_user.c
+ :doc: Userspace I/O
+
+.. kernel-doc:: include/uapi/linux/target_core_user.h
+ :doc: Ring Design
+
+iSCSI helper functions
+======================
+
+.. kernel-doc:: drivers/scsi/libiscsi.c
+ :export:
+
+
+iSCSI boot information
+======================
+
+.. kernel-doc:: drivers/scsi/iscsi_boot_sysfs.c
+ :export:
+
+iSCSI TCP interfaces
+====================
+
+.. kernel-doc:: drivers/scsi/iscsi_tcp.c
+ :internal:
+
+.. kernel-doc:: drivers/scsi/libiscsi_tcp.c
+ :export:
+
diff --git a/Documentation/driver-api/thermal/cpu-cooling-api.rst b/Documentation/driver-api/thermal/cpu-cooling-api.rst
new file mode 100644
index 0000000000..645d914c45
--- /dev/null
+++ b/Documentation/driver-api/thermal/cpu-cooling-api.rst
@@ -0,0 +1,107 @@
+=======================
+CPU cooling APIs How To
+=======================
+
+Written by Amit Daniel Kachhap <amit.kachhap@linaro.org>
+
+Updated: 6 Jan 2015
+
+Copyright (c) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com)
+
+0. Introduction
+===============
+
+The generic cpu cooling(freq clipping) provides registration/unregistration APIs
+to the caller. The binding of the cooling devices to the trip point is left for
+the user. The registration APIs returns the cooling device pointer.
+
+1. cpu cooling APIs
+===================
+
+1.1 cpufreq registration/unregistration APIs
+--------------------------------------------
+
+ ::
+
+ struct thermal_cooling_device
+ *cpufreq_cooling_register(struct cpumask *clip_cpus)
+
+ This interface function registers the cpufreq cooling device with the name
+ "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
+ cooling devices.
+
+ clip_cpus:
+ cpumask of cpus where the frequency constraints will happen.
+
+ ::
+
+ struct thermal_cooling_device
+ *of_cpufreq_cooling_register(struct cpufreq_policy *policy)
+
+ This interface function registers the cpufreq cooling device with
+ the name "thermal-cpufreq-%x" linking it with a device tree node, in
+ order to bind it via the thermal DT code. This api can support multiple
+ instances of cpufreq cooling devices.
+
+ policy:
+ CPUFreq policy.
+
+
+ ::
+
+ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
+
+ This interface function unregisters the "thermal-cpufreq-%x" cooling device.
+
+ cdev: Cooling device pointer which has to be unregistered.
+
+2. Power models
+===============
+
+The power API registration functions provide a simple power model for
+CPUs. The current power is calculated as dynamic power (static power isn't
+supported currently). This power model requires that the operating-points of
+the CPUs are registered using the kernel's opp library and the
+`cpufreq_frequency_table` is assigned to the `struct device` of the
+cpu. If you are using CONFIG_CPUFREQ_DT then the
+`cpufreq_frequency_table` should already be assigned to the cpu
+device.
+
+The dynamic power consumption of a processor depends on many factors.
+For a given processor implementation the primary factors are:
+
+- The time the processor spends running, consuming dynamic power, as
+ compared to the time in idle states where dynamic consumption is
+ negligible. Herein we refer to this as 'utilisation'.
+- The voltage and frequency levels as a result of DVFS. The DVFS
+ level is a dominant factor governing power consumption.
+- In running time the 'execution' behaviour (instruction types, memory
+ access patterns and so forth) causes, in most cases, a second order
+ variation. In pathological cases this variation can be significant,
+ but typically it is of a much lesser impact than the factors above.
+
+A high level dynamic power consumption model may then be represented as::
+
+ Pdyn = f(run) * Voltage^2 * Frequency * Utilisation
+
+f(run) here represents the described execution behaviour and its
+result has a units of Watts/Hz/Volt^2 (this often expressed in
+mW/MHz/uVolt^2)
+
+The detailed behaviour for f(run) could be modelled on-line. However,
+in practice, such an on-line model has dependencies on a number of
+implementation specific processor support and characterisation
+factors. Therefore, in initial implementation that contribution is
+represented as a constant coefficient. This is a simplification
+consistent with the relative contribution to overall power variation.
+
+In this simplified representation our model becomes::
+
+ Pdyn = Capacitance * Voltage^2 * Frequency * Utilisation
+
+Where `capacitance` is a constant that represents an indicative
+running time dynamic power coefficient in fundamental units of
+mW/MHz/uVolt^2. Typical values for mobile CPUs might lie in range
+from 100 to 500. For reference, the approximate values for the SoC in
+ARM's Juno Development Platform are 530 for the Cortex-A57 cluster and
+140 for the Cortex-A53 cluster.
diff --git a/Documentation/driver-api/thermal/cpu-idle-cooling.rst b/Documentation/driver-api/thermal/cpu-idle-cooling.rst
new file mode 100644
index 0000000000..c2a7ca6768
--- /dev/null
+++ b/Documentation/driver-api/thermal/cpu-idle-cooling.rst
@@ -0,0 +1,199 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+================
+CPU Idle Cooling
+================
+
+Situation:
+----------
+
+Under certain circumstances a SoC can reach a critical temperature
+limit and is unable to stabilize the temperature around a temperature
+control. When the SoC has to stabilize the temperature, the kernel can
+act on a cooling device to mitigate the dissipated power. When the
+critical temperature is reached, a decision must be taken to reduce
+the temperature, that, in turn impacts performance.
+
+Another situation is when the silicon temperature continues to
+increase even after the dynamic leakage is reduced to its minimum by
+clock gating the component. This runaway phenomenon can continue due
+to the static leakage. The only solution is to power down the
+component, thus dropping the dynamic and static leakage that will
+allow the component to cool down.
+
+Last but not least, the system can ask for a specific power budget but
+because of the OPP density, we can only choose an OPP with a power
+budget lower than the requested one and under-utilize the CPU, thus
+losing performance. In other words, one OPP under-utilizes the CPU
+with a power less than the requested power budget and the next OPP
+exceeds the power budget. An intermediate OPP could have been used if
+it were present.
+
+Solutions:
+----------
+
+If we can remove the static and the dynamic leakage for a specific
+duration in a controlled period, the SoC temperature will
+decrease. Acting on the idle state duration or the idle cycle
+injection period, we can mitigate the temperature by modulating the
+power budget.
+
+The Operating Performance Point (OPP) density has a great influence on
+the control precision of cpufreq, however different vendors have a
+plethora of OPP density, and some have large power gap between OPPs,
+that will result in loss of performance during thermal control and
+loss of power in other scenarios.
+
+At a specific OPP, we can assume that injecting idle cycle on all CPUs
+belong to the same cluster, with a duration greater than the cluster
+idle state target residency, we lead to dropping the static and the
+dynamic leakage for this period (modulo the energy needed to enter
+this state). So the sustainable power with idle cycles has a linear
+relation with the OPP’s sustainable power and can be computed with a
+coefficient similar to::
+
+ Power(IdleCycle) = Coef x Power(OPP)
+
+Idle Injection:
+---------------
+
+The base concept of the idle injection is to force the CPU to go to an
+idle state for a specified time each control cycle, it provides
+another way to control CPU power and heat in addition to
+cpufreq. Ideally, if all CPUs belonging to the same cluster, inject
+their idle cycles synchronously, the cluster can reach its power down
+state with a minimum power consumption and reduce the static leakage
+to almost zero. However, these idle cycles injection will add extra
+latencies as the CPUs will have to wakeup from a deep sleep state.
+
+We use a fixed duration of idle injection that gives an acceptable
+performance penalty and a fixed latency. Mitigation can be increased
+or decreased by modulating the duty cycle of the idle injection.
+
+::
+
+ ^
+ |
+ |
+ |------- -------
+ |_______|_______________________|_______|___________
+
+ <------>
+ idle <---------------------->
+ running
+
+ <----------------------------->
+ duty cycle 25%
+
+
+The implementation of the cooling device bases the number of states on
+the duty cycle percentage. When no mitigation is happening the cooling
+device state is zero, meaning the duty cycle is 0%.
+
+When the mitigation begins, depending on the governor's policy, a
+starting state is selected. With a fixed idle duration and the duty
+cycle (aka the cooling device state), the running duration can be
+computed.
+
+The governor will change the cooling device state thus the duty cycle
+and this variation will modulate the cooling effect.
+
+::
+
+ ^
+ |
+ |
+ |------- -------
+ |_______|_______________|_______|___________
+
+ <------>
+ idle <-------------->
+ running
+
+ <--------------------->
+ duty cycle 33%
+
+
+ ^
+ |
+ |
+ |------- -------
+ |_______|_______|_______|___________
+
+ <------>
+ idle <------>
+ running
+
+ <------------->
+ duty cycle 50%
+
+The idle injection duration value must comply with the constraints:
+
+- It is less than or equal to the latency we tolerate when the
+ mitigation begins. It is platform dependent and will depend on the
+ user experience, reactivity vs performance trade off we want. This
+ value should be specified.
+
+- It is greater than the idle state’s target residency we want to go
+ for thermal mitigation, otherwise we end up consuming more energy.
+
+Power considerations
+--------------------
+
+When we reach the thermal trip point, we have to sustain a specified
+power for a specific temperature but at this time we consume::
+
+ Power = Capacitance x Voltage^2 x Frequency x Utilisation
+
+... which is more than the sustainable power (or there is something
+wrong in the system setup). The ‘Capacitance’ and ‘Utilisation’ are a
+fixed value, ‘Voltage’ and the ‘Frequency’ are fixed artificially
+because we don’t want to change the OPP. We can group the
+‘Capacitance’ and the ‘Utilisation’ into a single term which is the
+‘Dynamic Power Coefficient (Cdyn)’ Simplifying the above, we have::
+
+ Pdyn = Cdyn x Voltage^2 x Frequency
+
+The power allocator governor will ask us somehow to reduce our power
+in order to target the sustainable power defined in the device
+tree. So with the idle injection mechanism, we want an average power
+(Ptarget) resulting in an amount of time running at full power on a
+specific OPP and idle another amount of time. That could be put in a
+equation::
+
+ P(opp)target = ((Trunning x (P(opp)running) + (Tidle x P(opp)idle)) /
+ (Trunning + Tidle)
+
+ ...
+
+ Tidle = Trunning x ((P(opp)running / P(opp)target) - 1)
+
+At this point if we know the running period for the CPU, that gives us
+the idle injection we need. Alternatively if we have the idle
+injection duration, we can compute the running duration with::
+
+ Trunning = Tidle / ((P(opp)running / P(opp)target) - 1)
+
+Practically, if the running power is less than the targeted power, we
+end up with a negative time value, so obviously the equation usage is
+bound to a power reduction, hence a higher OPP is needed to have the
+running power greater than the targeted power.
+
+However, in this demonstration we ignore three aspects:
+
+ * The static leakage is not defined here, we can introduce it in the
+ equation but assuming it will be zero most of the time as it is
+ difficult to get the values from the SoC vendors
+
+ * The idle state wake up latency (or entry + exit latency) is not
+ taken into account, it must be added in the equation in order to
+ rigorously compute the idle injection
+
+ * The injected idle duration must be greater than the idle state
+ target residency, otherwise we end up consuming more energy and
+ potentially invert the mitigation effect
+
+So the final equation is::
+
+ Trunning = (Tidle - Twakeup ) x
+ (((P(opp)dyn + P(opp)static ) - P(opp)target) / P(opp)target )
diff --git a/Documentation/driver-api/thermal/exynos_thermal.rst b/Documentation/driver-api/thermal/exynos_thermal.rst
new file mode 100644
index 0000000000..764df4ab58
--- /dev/null
+++ b/Documentation/driver-api/thermal/exynos_thermal.rst
@@ -0,0 +1,90 @@
+========================
+Kernel driver exynos_tmu
+========================
+
+Supported chips:
+
+* ARM Samsung Exynos4, Exynos5 series of SoC
+
+ Datasheet: Not publicly available
+
+Authors: Donggeun Kim <dg77.kim@samsung.com>
+Authors: Amit Daniel <amit.daniel@samsung.com>
+
+TMU controller Description:
+---------------------------
+
+This driver allows to read temperature inside Samsung Exynos4/5 series of SoC.
+
+The chip only exposes the measured 8-bit temperature code value
+through a register.
+Temperature can be taken from the temperature code.
+There are three equations converting from temperature to temperature code.
+
+The three equations are:
+ 1. Two point trimming::
+
+ Tc = (T - 25) * (TI2 - TI1) / (85 - 25) + TI1
+
+ 2. One point trimming::
+
+ Tc = T + TI1 - 25
+
+ 3. No trimming::
+
+ Tc = T + 50
+
+ Tc:
+ Temperature code, T: Temperature,
+ TI1:
+ Trimming info for 25 degree Celsius (stored at TRIMINFO register)
+ Temperature code measured at 25 degree Celsius which is unchanged
+ TI2:
+ Trimming info for 85 degree Celsius (stored at TRIMINFO register)
+ Temperature code measured at 85 degree Celsius which is unchanged
+
+TMU(Thermal Management Unit) in Exynos4/5 generates interrupt
+when temperature exceeds pre-defined levels.
+The maximum number of configurable threshold is five.
+The threshold levels are defined as follows::
+
+ Level_0: current temperature > trigger_level_0 + threshold
+ Level_1: current temperature > trigger_level_1 + threshold
+ Level_2: current temperature > trigger_level_2 + threshold
+ Level_3: current temperature > trigger_level_3 + threshold
+
+The threshold and each trigger_level are set
+through the corresponding registers.
+
+When an interrupt occurs, this driver notify kernel thermal framework
+with the function exynos_report_trigger.
+Although an interrupt condition for level_0 can be set,
+it can be used to synchronize the cooling action.
+
+TMU driver description:
+-----------------------
+
+The exynos thermal driver is structured as::
+
+ Kernel Core thermal framework
+ (thermal_core.c, step_wise.c, cpufreq_cooling.c)
+ ^
+ |
+ |
+ TMU configuration data -----> TMU Driver <----> Exynos Core thermal wrapper
+ (exynos_tmu_data.c) (exynos_tmu.c) (exynos_thermal_common.c)
+ (exynos_tmu_data.h) (exynos_tmu.h) (exynos_thermal_common.h)
+
+a) TMU configuration data:
+ This consist of TMU register offsets/bitfields
+ described through structure exynos_tmu_registers. Also several
+ other platform data (struct exynos_tmu_platform_data) members
+ are used to configure the TMU.
+b) TMU driver:
+ This component initialises the TMU controller and sets different
+ thresholds. It invokes core thermal implementation with the call
+ exynos_report_trigger.
+c) Exynos Core thermal wrapper:
+ This provides 3 wrapper function to use the
+ Kernel core thermal framework. They are exynos_unregister_thermal,
+ exynos_register_thermal and exynos_report_trigger.
diff --git a/Documentation/driver-api/thermal/exynos_thermal_emulation.rst b/Documentation/driver-api/thermal/exynos_thermal_emulation.rst
new file mode 100644
index 0000000000..c21d10838b
--- /dev/null
+++ b/Documentation/driver-api/thermal/exynos_thermal_emulation.rst
@@ -0,0 +1,61 @@
+=====================
+Exynos Emulation Mode
+=====================
+
+Copyright (C) 2012 Samsung Electronics
+
+Written by Jonghwa Lee <jonghwa3.lee@samsung.com>
+
+Description
+-----------
+
+Exynos 4x12 (4212, 4412) and 5 series provide emulation mode for thermal
+management unit. Thermal emulation mode supports software debug for
+TMU's operation. User can set temperature manually with software code
+and TMU will read current temperature from user value not from sensor's
+value.
+
+Enabling CONFIG_THERMAL_EMULATION option will make this support
+available. When it's enabled, sysfs node will be created as
+/sys/devices/virtual/thermal/thermal_zone'zone id'/emul_temp.
+
+The sysfs node, 'emul_node', will contain value 0 for the initial state.
+When you input any temperature you want to update to sysfs node, it
+automatically enable emulation mode and current temperature will be
+changed into it.
+
+(Exynos also supports user changeable delay time which would be used to
+delay of changing temperature. However, this node only uses same delay
+of real sensing time, 938us.)
+
+Exynos emulation mode requires synchronous of value changing and
+enabling. It means when you want to update the any value of delay or
+next temperature, then you have to enable emulation mode at the same
+time. (Or you have to keep the mode enabling.) If you don't, it fails to
+change the value to updated one and just use last succeessful value
+repeatedly. That's why this node gives users the right to change
+termerpature only. Just one interface makes it more simply to use.
+
+Disabling emulation mode only requires writing value 0 to sysfs node.
+
+::
+
+
+ TEMP 120 |
+ |
+ 100 |
+ |
+ 80 |
+ | +-----------
+ 60 | | |
+ | +-------------| |
+ 40 | | | |
+ | | | |
+ 20 | | | +----------
+ | | | | |
+ 0 |______________|_____________|__________|__________|_________
+ A A A A TIME
+ |<----->| |<----->| |<----->| |
+ | 938us | | | | | |
+ emulation : 0 50 | 70 | 20 | 0
+ current temp: sensor 50 70 20 sensor
diff --git a/Documentation/driver-api/thermal/index.rst b/Documentation/driver-api/thermal/index.rst
new file mode 100644
index 0000000000..a886028014
--- /dev/null
+++ b/Documentation/driver-api/thermal/index.rst
@@ -0,0 +1,19 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=======
+Thermal
+=======
+
+.. toctree::
+ :maxdepth: 1
+
+ cpu-cooling-api
+ cpu-idle-cooling
+ sysfs-api
+ power_allocator
+
+ exynos_thermal
+ exynos_thermal_emulation
+ nouveau_thermal
+ x86_pkg_temperature_thermal
+ intel_dptf
diff --git a/Documentation/driver-api/thermal/intel_dptf.rst b/Documentation/driver-api/thermal/intel_dptf.rst
new file mode 100644
index 0000000000..9ab4316322
--- /dev/null
+++ b/Documentation/driver-api/thermal/intel_dptf.rst
@@ -0,0 +1,317 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============================================================
+Intel(R) Dynamic Platform and Thermal Framework Sysfs Interface
+===============================================================
+
+:Copyright: © 2022 Intel Corporation
+
+:Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
+
+Introduction
+------------
+
+Intel(R) Dynamic Platform and Thermal Framework (DPTF) is a platform
+level hardware/software solution for power and thermal management.
+
+As a container for multiple power/thermal technologies, DPTF provides
+a coordinated approach for different policies to effect the hardware
+state of a system.
+
+Since it is a platform level framework, this has several components.
+Some parts of the technology is implemented in the firmware and uses
+ACPI and PCI devices to expose various features for monitoring and
+control. Linux has a set of kernel drivers exposing hardware interface
+to user space. This allows user space thermal solutions like
+"Linux Thermal Daemon" to read platform specific thermal and power
+tables to deliver adequate performance while keeping the system under
+thermal limits.
+
+DPTF ACPI Drivers interface
+----------------------------
+
+:file:`/sys/bus/platform/devices/<N>/uuids`, where <N>
+=INT3400|INTC1040|INTC1041|INTC10A0
+
+``available_uuids`` (RO)
+ A set of UUIDs strings presenting available policies
+ which should be notified to the firmware when the
+ user space can support those policies.
+
+ UUID strings:
+
+ "42A441D6-AE6A-462b-A84B-4A8CE79027D3" : Passive 1
+
+ "3A95C389-E4B8-4629-A526-C52C88626BAE" : Active
+
+ "97C68AE7-15FA-499c-B8C9-5DA81D606E0A" : Critical
+
+ "63BE270F-1C11-48FD-A6F7-3AF253FF3E2D" : Adaptive performance
+
+ "5349962F-71E6-431D-9AE8-0A635B710AEE" : Emergency call
+
+ "9E04115A-AE87-4D1C-9500-0F3E340BFE75" : Passive 2
+
+ "F5A35014-C209-46A4-993A-EB56DE7530A1" : Power Boss
+
+ "6ED722A7-9240-48A5-B479-31EEF723D7CF" : Virtual Sensor
+
+ "16CAF1B7-DD38-40ED-B1C1-1B8A1913D531" : Cooling mode
+
+ "BE84BABF-C4D4-403D-B495-3128FD44dAC1" : HDC
+
+``current_uuid`` (RW)
+ User space can write strings from available UUIDs, one at a
+ time.
+
+:file:`/sys/bus/platform/devices/<N>/`, where <N>
+=INT3400|INTC1040|INTC1041|INTC10A0
+
+``imok`` (WO)
+ User space daemon write 1 to respond to firmware event
+ for sending keep alive notification. User space receives
+ THERMAL_EVENT_KEEP_ALIVE kobject uevent notification when
+ firmware calls for user space to respond with imok ACPI
+ method.
+
+``odvp*`` (RO)
+ Firmware thermal status variable values. Thermal tables
+ calls for different processing based on these variable
+ values.
+
+``data_vault`` (RO)
+ Binary thermal table. Refer to
+ https:/github.com/intel/thermal_daemon for decoding
+ thermal table.
+
+``production_mode`` (RO)
+ When different from zero, manufacturer locked thermal configuration
+ from further changes.
+
+ACPI Thermal Relationship table interface
+------------------------------------------
+
+:file:`/dev/acpi_thermal_rel`
+
+ This device provides IOCTL interface to read standard ACPI
+ thermal relationship tables via ACPI methods _TRT and _ART.
+ These IOCTLs are defined in
+ drivers/thermal/intel/int340x_thermal/acpi_thermal_rel.h
+
+ IOCTLs:
+
+ ACPI_THERMAL_GET_TRT_LEN: Get length of TRT table
+
+ ACPI_THERMAL_GET_ART_LEN: Get length of ART table
+
+ ACPI_THERMAL_GET_TRT_COUNT: Number of records in TRT table
+
+ ACPI_THERMAL_GET_ART_COUNT: Number of records in ART table
+
+ ACPI_THERMAL_GET_TRT: Read binary TRT table, length to read is
+ provided via argument to ioctl().
+
+ ACPI_THERMAL_GET_ART: Read binary ART table, length to read is
+ provided via argument to ioctl().
+
+DPTF ACPI Sensor drivers
+-------------------------
+
+DPTF Sensor drivers are presented as standard thermal sysfs thermal_zone.
+
+
+DPTF ACPI Cooling drivers
+--------------------------
+
+DPTF cooling drivers are presented as standard thermal sysfs cooling_device.
+
+
+DPTF Processor thermal PCI Driver interface
+--------------------------------------------
+
+:file:`/sys/bus/pci/devices/0000\:00\:04.0/power_limits/`
+
+Refer to Documentation/power/powercap/powercap.rst for powercap
+ABI.
+
+``power_limit_0_max_uw`` (RO)
+ Maximum powercap sysfs constraint_0_power_limit_uw for Intel RAPL
+
+``power_limit_0_step_uw`` (RO)
+ Power limit increment/decrements for Intel RAPL constraint 0 power limit
+
+``power_limit_0_min_uw`` (RO)
+ Minimum powercap sysfs constraint_0_power_limit_uw for Intel RAPL
+
+``power_limit_0_tmin_us`` (RO)
+ Minimum powercap sysfs constraint_0_time_window_us for Intel RAPL
+
+``power_limit_0_tmax_us`` (RO)
+ Maximum powercap sysfs constraint_0_time_window_us for Intel RAPL
+
+``power_limit_1_max_uw`` (RO)
+ Maximum powercap sysfs constraint_1_power_limit_uw for Intel RAPL
+
+``power_limit_1_step_uw`` (RO)
+ Power limit increment/decrements for Intel RAPL constraint 1 power limit
+
+``power_limit_1_min_uw`` (RO)
+ Minimum powercap sysfs constraint_1_power_limit_uw for Intel RAPL
+
+``power_limit_1_tmin_us`` (RO)
+ Minimum powercap sysfs constraint_1_time_window_us for Intel RAPL
+
+``power_limit_1_tmax_us`` (RO)
+ Maximum powercap sysfs constraint_1_time_window_us for Intel RAPL
+
+:file:`/sys/bus/pci/devices/0000\:00\:04.0/`
+
+``tcc_offset_degree_celsius`` (RW)
+ TCC offset from the critical temperature where hardware will throttle
+ CPU.
+
+:file:`/sys/bus/pci/devices/0000\:00\:04.0/workload_request`
+
+``workload_available_types`` (RO)
+ Available workload types. User space can specify one of the workload type
+ it is currently executing via workload_type. For example: idle, bursty,
+ sustained etc.
+
+``workload_type`` (RW)
+ User space can specify any one of the available workload type using
+ this interface.
+
+DPTF Processor thermal RFIM interface
+--------------------------------------------
+
+RFIM interface allows adjustment of FIVR (Fully Integrated Voltage Regulator),
+DDR (Double Data Rate) and DLVR (Digital Linear Voltage Regulator)
+frequencies to avoid RF interference with WiFi and 5G.
+
+Switching voltage regulators (VR) generate radiated EMI or RFI at the
+fundamental frequency and its harmonics. Some harmonics may interfere
+with very sensitive wireless receivers such as Wi-Fi and cellular that
+are integrated into host systems like notebook PCs. One of mitigation
+methods is requesting SOC integrated VR (IVR) switching frequency to a
+small % and shift away the switching noise harmonic interference from
+radio channels. OEM or ODMs can use the driver to control SOC IVR
+operation within the range where it does not impact IVR performance.
+
+Some products use DLVR instead of FIVR as switching voltage regulator.
+In this case attributes of DLVR must be adjusted instead of FIVR.
+
+While shifting the frequencies additional clock noise can be introduced,
+which is compensated by adjusting Spread spectrum percent. This helps
+to reduce the clock noise to meet regulatory compliance. This spreading
+% increases bandwidth of signal transmission and hence reduces the
+effects of interference, noise and signal fading.
+
+DRAM devices of DDR IO interface and their power plane can generate EMI
+at the data rates. Similar to IVR control mechanism, Intel offers a
+mechanism by which DDR data rates can be changed if several conditions
+are met: there is strong RFI interference because of DDR; CPU power
+management has no other restriction in changing DDR data rates;
+PC ODMs enable this feature (real time DDR RFI Mitigation referred to as
+DDR-RFIM) for Wi-Fi from BIOS.
+
+
+FIVR attributes
+
+:file:`/sys/bus/pci/devices/0000\:00\:04.0/fivr/`
+
+``vco_ref_code_lo`` (RW)
+ The VCO reference code is an 11-bit field and controls the FIVR
+ switching frequency. This is the 3-bit LSB field.
+
+``vco_ref_code_hi`` (RW)
+ The VCO reference code is an 11-bit field and controls the FIVR
+ switching frequency. This is the 8-bit MSB field.
+
+``spread_spectrum_pct`` (RW)
+ Set the FIVR spread spectrum clocking percentage
+
+``spread_spectrum_clk_enable`` (RW)
+ Enable/disable of the FIVR spread spectrum clocking feature
+
+``rfi_vco_ref_code`` (RW)
+ This field is a read only status register which reflects the
+ current FIVR switching frequency
+
+``fivr_fffc_rev`` (RW)
+ This field indicated the revision of the FIVR HW.
+
+
+DVFS attributes
+
+:file:`/sys/bus/pci/devices/0000\:00\:04.0/dvfs/`
+
+``rfi_restriction_run_busy`` (RW)
+ Request the restriction of specific DDR data rate and set this
+ value 1. Self reset to 0 after operation.
+
+``rfi_restriction_err_code`` (RW)
+ 0 :Request is accepted, 1:Feature disabled,
+ 2: the request restricts more points than it is allowed
+
+``rfi_restriction_data_rate_Delta`` (RW)
+ Restricted DDR data rate for RFI protection: Lower Limit
+
+``rfi_restriction_data_rate_Base`` (RW)
+ Restricted DDR data rate for RFI protection: Upper Limit
+
+``ddr_data_rate_point_0`` (RO)
+ DDR data rate selection 1st point
+
+``ddr_data_rate_point_1`` (RO)
+ DDR data rate selection 2nd point
+
+``ddr_data_rate_point_2`` (RO)
+ DDR data rate selection 3rd point
+
+``ddr_data_rate_point_3`` (RO)
+ DDR data rate selection 4th point
+
+``rfi_disable (RW)``
+ Disable DDR rate change feature
+
+DLVR attributes
+
+:file:`/sys/bus/pci/devices/0000\:00\:04.0/dlvr/`
+
+``dlvr_hardware_rev`` (RO)
+ DLVR hardware revision.
+
+``dlvr_freq_mhz`` (RO)
+ Current DLVR PLL frequency in MHz.
+
+``dlvr_freq_select`` (RW)
+ Sets DLVR PLL clock frequency. Once set, and enabled via
+ dlvr_rfim_enable, the dlvr_freq_mhz will show the current
+ DLVR PLL frequency.
+
+``dlvr_pll_busy`` (RO)
+ PLL can't accept frequency change when set.
+
+``dlvr_rfim_enable`` (RW)
+ 0: Disable RF frequency hopping, 1: Enable RF frequency hopping.
+
+``dlvr_spread_spectrum_pct`` (RW)
+ Sets DLVR spread spectrum percent value.
+
+``dlvr_control_mode`` (RW)
+ Specifies how frequencies are spread using spread spectrum.
+ 0: Down spread,
+ 1: Spread in the Center.
+
+``dlvr_control_lock`` (RW)
+ 1: future writes are ignored.
+
+DPTF Power supply and Battery Interface
+----------------------------------------
+
+Refer to Documentation/ABI/testing/sysfs-platform-dptf
+
+DPTF Fan Control
+----------------------------------------
+
+Refer to Documentation/admin-guide/acpi/fan_performance_states.rst
diff --git a/Documentation/driver-api/thermal/nouveau_thermal.rst b/Documentation/driver-api/thermal/nouveau_thermal.rst
new file mode 100644
index 0000000000..aa10db6df3
--- /dev/null
+++ b/Documentation/driver-api/thermal/nouveau_thermal.rst
@@ -0,0 +1,96 @@
+=====================
+Kernel driver nouveau
+=====================
+
+Supported chips:
+
+* NV43+
+
+Authors: Martin Peres (mupuf) <martin.peres@free.fr>
+
+Description
+-----------
+
+This driver allows to read the GPU core temperature, drive the GPU fan and
+set temperature alarms.
+
+Currently, due to the absence of in-kernel API to access HWMON drivers, Nouveau
+cannot access any of the i2c external monitoring chips it may find. If you
+have one of those, temperature and/or fan management through Nouveau's HWMON
+interface is likely not to work. This document may then not cover your situation
+entirely.
+
+Temperature management
+----------------------
+
+Temperature is exposed under as a read-only HWMON attribute temp1_input.
+
+In order to protect the GPU from overheating, Nouveau supports 4 configurable
+temperature thresholds:
+
+ * Fan_boost:
+ Fan speed is set to 100% when reaching this temperature;
+ * Downclock:
+ The GPU will be downclocked to reduce its power dissipation;
+ * Critical:
+ The GPU is put on hold to further lower power dissipation;
+ * Shutdown:
+ Shut the computer down to protect your GPU.
+
+WARNING:
+ Some of these thresholds may not be used by Nouveau depending
+ on your chipset.
+
+The default value for these thresholds comes from the GPU's vbios. These
+thresholds can be configured thanks to the following HWMON attributes:
+
+ * Fan_boost: temp1_auto_point1_temp and temp1_auto_point1_temp_hyst;
+ * Downclock: temp1_max and temp1_max_hyst;
+ * Critical: temp1_crit and temp1_crit_hyst;
+ * Shutdown: temp1_emergency and temp1_emergency_hyst.
+
+NOTE: Remember that the values are stored as milli degrees Celsius. Don't forget
+to multiply!
+
+Fan management
+--------------
+
+Not all cards have a drivable fan. If you do, then the following HWMON
+attributes should be available:
+
+ * pwm1_enable:
+ Current fan management mode (NONE, MANUAL or AUTO);
+ * pwm1:
+ Current PWM value (power percentage);
+ * pwm1_min:
+ The minimum PWM speed allowed;
+ * pwm1_max:
+ The maximum PWM speed allowed (bypassed when hitting Fan_boost);
+
+You may also have the following attribute:
+
+ * fan1_input:
+ Speed in RPM of your fan.
+
+Your fan can be driven in different modes:
+
+ * 0: The fan is left untouched;
+ * 1: The fan can be driven in manual (use pwm1 to change the speed);
+ * 2; The fan is driven automatically depending on the temperature.
+
+NOTE:
+ Be sure to use the manual mode if you want to drive the fan speed manually
+
+NOTE2:
+ When operating in manual mode outside the vbios-defined
+ [PWM_min, PWM_max] range, the reported fan speed (RPM) may not be accurate
+ depending on your hardware.
+
+Bug reports
+-----------
+
+Thermal management on Nouveau is new and may not work on all cards. If you have
+inquiries, please ping mupuf on IRC (#nouveau, OFTC).
+
+Bug reports should be filled on Freedesktop's bug tracker. Please follow
+https://nouveau.freedesktop.org/wiki/Bugs
diff --git a/Documentation/driver-api/thermal/power_allocator.rst b/Documentation/driver-api/thermal/power_allocator.rst
new file mode 100644
index 0000000000..aa5f66552d
--- /dev/null
+++ b/Documentation/driver-api/thermal/power_allocator.rst
@@ -0,0 +1,281 @@
+=================================
+Power allocator governor tunables
+=================================
+
+Trip points
+-----------
+
+The governor works optimally with the following two passive trip points:
+
+1. "switch on" trip point: temperature above which the governor
+ control loop starts operating. This is the first passive trip
+ point of the thermal zone.
+
+2. "desired temperature" trip point: it should be higher than the
+ "switch on" trip point. This the target temperature the governor
+ is controlling for. This is the last passive trip point of the
+ thermal zone.
+
+PID Controller
+--------------
+
+The power allocator governor implements a
+Proportional-Integral-Derivative controller (PID controller) with
+temperature as the control input and power as the controlled output:
+
+ P_max = k_p * e + k_i * err_integral + k_d * diff_err + sustainable_power
+
+where
+ - e = desired_temperature - current_temperature
+ - err_integral is the sum of previous errors
+ - diff_err = e - previous_error
+
+It is similar to the one depicted below::
+
+ k_d
+ |
+ current_temp |
+ | v
+ | +----------+ +---+
+ | +----->| diff_err |-->| X |------+
+ | | +----------+ +---+ |
+ | | | tdp actor
+ | | k_i | | get_requested_power()
+ | | | | | | |
+ | | | | | | | ...
+ v | v v v v v
+ +---+ | +-------+ +---+ +---+ +---+ +----------+
+ | S |-----+----->| sum e |----->| X |--->| S |-->| S |-->|power |
+ +---+ | +-------+ +---+ +---+ +---+ |allocation|
+ ^ | ^ +----------+
+ | | | | |
+ | | +---+ | | |
+ | +------->| X |-------------------+ v v
+ | +---+ granted performance
+ desired_temperature ^
+ |
+ |
+ k_po/k_pu
+
+Sustainable power
+-----------------
+
+An estimate of the sustainable dissipatable power (in mW) should be
+provided while registering the thermal zone. This estimates the
+sustained power that can be dissipated at the desired control
+temperature. This is the maximum sustained power for allocation at
+the desired maximum temperature. The actual sustained power can vary
+for a number of reasons. The closed loop controller will take care of
+variations such as environmental conditions, and some factors related
+to the speed-grade of the silicon. `sustainable_power` is therefore
+simply an estimate, and may be tuned to affect the aggressiveness of
+the thermal ramp. For reference, the sustainable power of a 4" phone
+is typically 2000mW, while on a 10" tablet is around 4500mW (may vary
+depending on screen size). It is possible to have the power value
+expressed in an abstract scale. The sustained power should be aligned
+to the scale used by the related cooling devices.
+
+If you are using device tree, do add it as a property of the
+thermal-zone. For example::
+
+ thermal-zones {
+ soc_thermal {
+ polling-delay = <1000>;
+ polling-delay-passive = <100>;
+ sustainable-power = <2500>;
+ ...
+
+Instead, if the thermal zone is registered from the platform code, pass a
+`thermal_zone_params` that has a `sustainable_power`. If no
+`thermal_zone_params` were being passed, then something like below
+will suffice::
+
+ static const struct thermal_zone_params tz_params = {
+ .sustainable_power = 3500,
+ };
+
+and then pass `tz_params` as the 5th parameter to
+`thermal_zone_device_register()`
+
+k_po and k_pu
+-------------
+
+The implementation of the PID controller in the power allocator
+thermal governor allows the configuration of two proportional term
+constants: `k_po` and `k_pu`. `k_po` is the proportional term
+constant during temperature overshoot periods (current temperature is
+above "desired temperature" trip point). Conversely, `k_pu` is the
+proportional term constant during temperature undershoot periods
+(current temperature below "desired temperature" trip point).
+
+These controls are intended as the primary mechanism for configuring
+the permitted thermal "ramp" of the system. For instance, a lower
+`k_pu` value will provide a slower ramp, at the cost of capping
+available capacity at a low temperature. On the other hand, a high
+value of `k_pu` will result in the governor granting very high power
+while temperature is low, and may lead to temperature overshooting.
+
+The default value for `k_pu` is::
+
+ 2 * sustainable_power / (desired_temperature - switch_on_temp)
+
+This means that at `switch_on_temp` the output of the controller's
+proportional term will be 2 * `sustainable_power`. The default value
+for `k_po` is::
+
+ sustainable_power / (desired_temperature - switch_on_temp)
+
+Focusing on the proportional and feed forward values of the PID
+controller equation we have::
+
+ P_max = k_p * e + sustainable_power
+
+The proportional term is proportional to the difference between the
+desired temperature and the current one. When the current temperature
+is the desired one, then the proportional component is zero and
+`P_max` = `sustainable_power`. That is, the system should operate in
+thermal equilibrium under constant load. `sustainable_power` is only
+an estimate, which is the reason for closed-loop control such as this.
+
+Expanding `k_pu` we get::
+
+ P_max = 2 * sustainable_power * (T_set - T) / (T_set - T_on) +
+ sustainable_power
+
+where:
+
+ - T_set is the desired temperature
+ - T is the current temperature
+ - T_on is the switch on temperature
+
+When the current temperature is the switch_on temperature, the above
+formula becomes::
+
+ P_max = 2 * sustainable_power * (T_set - T_on) / (T_set - T_on) +
+ sustainable_power = 2 * sustainable_power + sustainable_power =
+ 3 * sustainable_power
+
+Therefore, the proportional term alone linearly decreases power from
+3 * `sustainable_power` to `sustainable_power` as the temperature
+rises from the switch on temperature to the desired temperature.
+
+k_i and integral_cutoff
+-----------------------
+
+`k_i` configures the PID loop's integral term constant. This term
+allows the PID controller to compensate for long term drift and for
+the quantized nature of the output control: cooling devices can't set
+the exact power that the governor requests. When the temperature
+error is below `integral_cutoff`, errors are accumulated in the
+integral term. This term is then multiplied by `k_i` and the result
+added to the output of the controller. Typically `k_i` is set low (1
+or 2) and `integral_cutoff` is 0.
+
+k_d
+---
+
+`k_d` configures the PID loop's derivative term constant. It's
+recommended to leave it as the default: 0.
+
+Cooling device power API
+========================
+
+Cooling devices controlled by this governor must supply the additional
+"power" API in their `cooling_device_ops`. It consists on three ops:
+
+1. ::
+
+ int get_requested_power(struct thermal_cooling_device *cdev,
+ struct thermal_zone_device *tz, u32 *power);
+
+
+@cdev:
+ The `struct thermal_cooling_device` pointer
+@tz:
+ thermal zone in which we are currently operating
+@power:
+ pointer in which to store the calculated power
+
+`get_requested_power()` calculates the power requested by the device
+in milliwatts and stores it in @power . It should return 0 on
+success, -E* on failure. This is currently used by the power
+allocator governor to calculate how much power to give to each cooling
+device.
+
+2. ::
+
+ int state2power(struct thermal_cooling_device *cdev, struct
+ thermal_zone_device *tz, unsigned long state,
+ u32 *power);
+
+@cdev:
+ The `struct thermal_cooling_device` pointer
+@tz:
+ thermal zone in which we are currently operating
+@state:
+ A cooling device state
+@power:
+ pointer in which to store the equivalent power
+
+Convert cooling device state @state into power consumption in
+milliwatts and store it in @power. It should return 0 on success, -E*
+on failure. This is currently used by thermal core to calculate the
+maximum power that an actor can consume.
+
+3. ::
+
+ int power2state(struct thermal_cooling_device *cdev, u32 power,
+ unsigned long *state);
+
+@cdev:
+ The `struct thermal_cooling_device` pointer
+@power:
+ power in milliwatts
+@state:
+ pointer in which to store the resulting state
+
+Calculate a cooling device state that would make the device consume at
+most @power mW and store it in @state. It should return 0 on success,
+-E* on failure. This is currently used by the thermal core to convert
+a given power set by the power allocator governor to a state that the
+cooling device can set. It is a function because this conversion may
+depend on external factors that may change so this function should the
+best conversion given "current circumstances".
+
+Cooling device weights
+----------------------
+
+Weights are a mechanism to bias the allocation among cooling
+devices. They express the relative power efficiency of different
+cooling devices. Higher weight can be used to express higher power
+efficiency. Weighting is relative such that if each cooling device
+has a weight of one they are considered equal. This is particularly
+useful in heterogeneous systems where two cooling devices may perform
+the same kind of compute, but with different efficiency. For example,
+a system with two different types of processors.
+
+If the thermal zone is registered using
+`thermal_zone_device_register()` (i.e., platform code), then weights
+are passed as part of the thermal zone's `thermal_bind_parameters`.
+If the platform is registered using device tree, then they are passed
+as the `contribution` property of each map in the `cooling-maps` node.
+
+Limitations of the power allocator governor
+===========================================
+
+The power allocator governor's PID controller works best if there is a
+periodic tick. If you have a driver that calls
+`thermal_zone_device_update()` (or anything that ends up calling the
+governor's `throttle()` function) repetitively, the governor response
+won't be very good. Note that this is not particular to this
+governor, step-wise will also misbehave if you call its throttle()
+faster than the normal thermal framework tick (due to interrupts for
+example) as it will overreact.
+
+Energy Model requirements
+=========================
+
+Another important thing is the consistent scale of the power values
+provided by the cooling devices. All of the cooling devices in a single
+thermal zone should have power values reported either in milli-Watts
+or scaled to the same 'abstract scale'.
diff --git a/Documentation/driver-api/thermal/sysfs-api.rst b/Documentation/driver-api/thermal/sysfs-api.rst
new file mode 100644
index 0000000000..6c1175c6af
--- /dev/null
+++ b/Documentation/driver-api/thermal/sysfs-api.rst
@@ -0,0 +1,495 @@
+===================================
+Generic Thermal Sysfs driver How To
+===================================
+
+Written by Sujith Thomas <sujith.thomas@intel.com>, Zhang Rui <rui.zhang@intel.com>
+
+Updated: 2 January 2008
+
+Copyright (c) 2008 Intel Corporation
+
+
+0. Introduction
+===============
+
+The generic thermal sysfs provides a set of interfaces for thermal zone
+devices (sensors) and thermal cooling devices (fan, processor...) to register
+with the thermal management solution and to be a part of it.
+
+This how-to focuses on enabling new thermal zone and cooling devices to
+participate in thermal management.
+This solution is platform independent and any type of thermal zone devices
+and cooling devices should be able to make use of the infrastructure.
+
+The main task of the thermal sysfs driver is to expose thermal zone attributes
+as well as cooling device attributes to the user space.
+An intelligent thermal management application can make decisions based on
+inputs from thermal zone attributes (the current temperature and trip point
+temperature) and throttle appropriate devices.
+
+- `[0-*]` denotes any positive number starting from 0
+- `[1-*]` denotes any positive number starting from 1
+
+1. thermal sysfs driver interface functions
+===========================================
+
+1.1 thermal zone device interface
+---------------------------------
+
+ ::
+
+ struct thermal_zone_device
+ *thermal_zone_device_register(char *type,
+ int trips, int mask, void *devdata,
+ struct thermal_zone_device_ops *ops,
+ const struct thermal_zone_params *tzp,
+ int passive_delay, int polling_delay))
+
+ This interface function adds a new thermal zone device (sensor) to
+ /sys/class/thermal folder as `thermal_zone[0-*]`. It tries to bind all the
+ thermal cooling devices registered at the same time.
+
+ type:
+ the thermal zone type.
+ trips:
+ the total number of trip points this thermal zone supports.
+ mask:
+ Bit string: If 'n'th bit is set, then trip point 'n' is writable.
+ devdata:
+ device private data
+ ops:
+ thermal zone device call-backs.
+
+ .bind:
+ bind the thermal zone device with a thermal cooling device.
+ .unbind:
+ unbind the thermal zone device with a thermal cooling device.
+ .get_temp:
+ get the current temperature of the thermal zone.
+ .set_trips:
+ set the trip points window. Whenever the current temperature
+ is updated, the trip points immediately below and above the
+ current temperature are found.
+ .get_mode:
+ get the current mode (enabled/disabled) of the thermal zone.
+
+ - "enabled" means the kernel thermal management is
+ enabled.
+ - "disabled" will prevent kernel thermal driver action
+ upon trip points so that user applications can take
+ charge of thermal management.
+ .set_mode:
+ set the mode (enabled/disabled) of the thermal zone.
+ .get_trip_type:
+ get the type of certain trip point.
+ .get_trip_temp:
+ get the temperature above which the certain trip point
+ will be fired.
+ .set_emul_temp:
+ set the emulation temperature which helps in debugging
+ different threshold temperature points.
+ tzp:
+ thermal zone platform parameters.
+ passive_delay:
+ number of milliseconds to wait between polls when
+ performing passive cooling.
+ polling_delay:
+ number of milliseconds to wait between polls when checking
+ whether trip points have been crossed (0 for interrupt driven systems).
+
+ ::
+
+ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
+
+ This interface function removes the thermal zone device.
+ It deletes the corresponding entry from /sys/class/thermal folder and
+ unbinds all the thermal cooling devices it uses.
+
+ ::
+
+ struct thermal_zone_device
+ *thermal_zone_of_sensor_register(struct device *dev, int sensor_id,
+ void *data,
+ const struct thermal_zone_of_device_ops *ops)
+
+ This interface adds a new sensor to a DT thermal zone.
+ This function will search the list of thermal zones described in
+ device tree and look for the zone that refer to the sensor device
+ pointed by dev->of_node as temperature providers. For the zone
+ pointing to the sensor node, the sensor will be added to the DT
+ thermal zone device.
+
+ The parameters for this interface are:
+
+ dev:
+ Device node of sensor containing valid node pointer in
+ dev->of_node.
+ sensor_id:
+ a sensor identifier, in case the sensor IP has more
+ than one sensors
+ data:
+ a private pointer (owned by the caller) that will be
+ passed back, when a temperature reading is needed.
+ ops:
+ `struct thermal_zone_of_device_ops *`.
+
+ ============== =======================================
+ get_temp a pointer to a function that reads the
+ sensor temperature. This is mandatory
+ callback provided by sensor driver.
+ set_trips a pointer to a function that sets a
+ temperature window. When this window is
+ left the driver must inform the thermal
+ core via thermal_zone_device_update.
+ get_trend a pointer to a function that reads the
+ sensor temperature trend.
+ set_emul_temp a pointer to a function that sets
+ sensor emulated temperature.
+ ============== =======================================
+
+ The thermal zone temperature is provided by the get_temp() function
+ pointer of thermal_zone_of_device_ops. When called, it will
+ have the private pointer @data back.
+
+ It returns error pointer if fails otherwise valid thermal zone device
+ handle. Caller should check the return handle with IS_ERR() for finding
+ whether success or not.
+
+ ::
+
+ void thermal_zone_of_sensor_unregister(struct device *dev,
+ struct thermal_zone_device *tzd)
+
+ This interface unregisters a sensor from a DT thermal zone which was
+ successfully added by interface thermal_zone_of_sensor_register().
+ This function removes the sensor callbacks and private data from the
+ thermal zone device registered with thermal_zone_of_sensor_register()
+ interface. It will also silent the zone by remove the .get_temp() and
+ get_trend() thermal zone device callbacks.
+
+ ::
+
+ struct thermal_zone_device
+ *devm_thermal_zone_of_sensor_register(struct device *dev,
+ int sensor_id,
+ void *data,
+ const struct thermal_zone_of_device_ops *ops)
+
+ This interface is resource managed version of
+ thermal_zone_of_sensor_register().
+
+ All details of thermal_zone_of_sensor_register() described in
+ section 1.1.3 is applicable here.
+
+ The benefit of using this interface to register sensor is that it
+ is not require to explicitly call thermal_zone_of_sensor_unregister()
+ in error path or during driver unbinding as this is done by driver
+ resource manager.
+
+ ::
+
+ void devm_thermal_zone_of_sensor_unregister(struct device *dev,
+ struct thermal_zone_device *tzd)
+
+ This interface is resource managed version of
+ thermal_zone_of_sensor_unregister().
+ All details of thermal_zone_of_sensor_unregister() described in
+ section 1.1.4 is applicable here.
+ Normally this function will not need to be called and the resource
+ management code will ensure that the resource is freed.
+
+ ::
+
+ int thermal_zone_get_slope(struct thermal_zone_device *tz)
+
+ This interface is used to read the slope attribute value
+ for the thermal zone device, which might be useful for platform
+ drivers for temperature calculations.
+
+ ::
+
+ int thermal_zone_get_offset(struct thermal_zone_device *tz)
+
+ This interface is used to read the offset attribute value
+ for the thermal zone device, which might be useful for platform
+ drivers for temperature calculations.
+
+1.2 thermal cooling device interface
+------------------------------------
+
+
+ ::
+
+ struct thermal_cooling_device
+ *thermal_cooling_device_register(char *name,
+ void *devdata, struct thermal_cooling_device_ops *)
+
+ This interface function adds a new thermal cooling device (fan/processor/...)
+ to /sys/class/thermal/ folder as `cooling_device[0-*]`. It tries to bind itself
+ to all the thermal zone devices registered at the same time.
+
+ name:
+ the cooling device name.
+ devdata:
+ device private data.
+ ops:
+ thermal cooling devices call-backs.
+
+ .get_max_state:
+ get the Maximum throttle state of the cooling device.
+ .get_cur_state:
+ get the Currently requested throttle state of the
+ cooling device.
+ .set_cur_state:
+ set the Current throttle state of the cooling device.
+
+ ::
+
+ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
+
+ This interface function removes the thermal cooling device.
+ It deletes the corresponding entry from /sys/class/thermal folder and
+ unbinds itself from all the thermal zone devices using it.
+
+1.3 interface for binding a thermal zone device with a thermal cooling device
+-----------------------------------------------------------------------------
+
+ ::
+
+ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
+ int trip, struct thermal_cooling_device *cdev,
+ unsigned long upper, unsigned long lower, unsigned int weight);
+
+ This interface function binds a thermal cooling device to a particular trip
+ point of a thermal zone device.
+
+ This function is usually called in the thermal zone device .bind callback.
+
+ tz:
+ the thermal zone device
+ cdev:
+ thermal cooling device
+ trip:
+ indicates which trip point in this thermal zone the cooling device
+ is associated with.
+ upper:
+ the Maximum cooling state for this trip point.
+ THERMAL_NO_LIMIT means no upper limit,
+ and the cooling device can be in max_state.
+ lower:
+ the Minimum cooling state can be used for this trip point.
+ THERMAL_NO_LIMIT means no lower limit,
+ and the cooling device can be in cooling state 0.
+ weight:
+ the influence of this cooling device in this thermal
+ zone. See 1.4.1 below for more information.
+
+ ::
+
+ int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
+ int trip, struct thermal_cooling_device *cdev);
+
+ This interface function unbinds a thermal cooling device from a particular
+ trip point of a thermal zone device. This function is usually called in
+ the thermal zone device .unbind callback.
+
+ tz:
+ the thermal zone device
+ cdev:
+ thermal cooling device
+ trip:
+ indicates which trip point in this thermal zone the cooling device
+ is associated with.
+
+1.4 Thermal Zone Parameters
+---------------------------
+
+ ::
+
+ struct thermal_zone_params
+
+ This structure defines the platform level parameters for a thermal zone.
+ This data, for each thermal zone should come from the platform layer.
+ This is an optional feature where some platforms can choose not to
+ provide this data.
+
+ .governor_name:
+ Name of the thermal governor used for this zone
+ .no_hwmon:
+ a boolean to indicate if the thermal to hwmon sysfs interface
+ is required. when no_hwmon == false, a hwmon sysfs interface
+ will be created. when no_hwmon == true, nothing will be done.
+ In case the thermal_zone_params is NULL, the hwmon interface
+ will be created (for backward compatibility).
+
+2. sysfs attributes structure
+=============================
+
+== ================
+RO read only value
+WO write only value
+RW read/write value
+== ================
+
+Thermal sysfs attributes will be represented under /sys/class/thermal.
+Hwmon sysfs I/F extension is also available under /sys/class/hwmon
+if hwmon is compiled in or built as a module.
+
+Thermal zone device sys I/F, created once it's registered::
+
+ /sys/class/thermal/thermal_zone[0-*]:
+ |---type: Type of the thermal zone
+ |---temp: Current temperature
+ |---mode: Working mode of the thermal zone
+ |---policy: Thermal governor used for this zone
+ |---available_policies: Available thermal governors for this zone
+ |---trip_point_[0-*]_temp: Trip point temperature
+ |---trip_point_[0-*]_type: Trip point type
+ |---trip_point_[0-*]_hyst: Hysteresis value for this trip point
+ |---emul_temp: Emulated temperature set node
+ |---sustainable_power: Sustainable dissipatable power
+ |---k_po: Proportional term during temperature overshoot
+ |---k_pu: Proportional term during temperature undershoot
+ |---k_i: PID's integral term in the power allocator gov
+ |---k_d: PID's derivative term in the power allocator
+ |---integral_cutoff: Offset above which errors are accumulated
+ |---slope: Slope constant applied as linear extrapolation
+ |---offset: Offset constant applied as linear extrapolation
+
+Thermal cooling device sys I/F, created once it's registered::
+
+ /sys/class/thermal/cooling_device[0-*]:
+ |---type: Type of the cooling device(processor/fan/...)
+ |---max_state: Maximum cooling state of the cooling device
+ |---cur_state: Current cooling state of the cooling device
+ |---stats: Directory containing cooling device's statistics
+ |---stats/reset: Writing any value resets the statistics
+ |---stats/time_in_state_ms: Time (msec) spent in various cooling states
+ |---stats/total_trans: Total number of times cooling state is changed
+ |---stats/trans_table: Cooling state transition table
+
+
+Then next two dynamic attributes are created/removed in pairs. They represent
+the relationship between a thermal zone and its associated cooling device.
+They are created/removed for each successful execution of
+thermal_zone_bind_cooling_device/thermal_zone_unbind_cooling_device.
+
+::
+
+ /sys/class/thermal/thermal_zone[0-*]:
+ |---cdev[0-*]: [0-*]th cooling device in current thermal zone
+ |---cdev[0-*]_trip_point: Trip point that cdev[0-*] is associated with
+ |---cdev[0-*]_weight: Influence of the cooling device in
+ this thermal zone
+
+Besides the thermal zone device sysfs I/F and cooling device sysfs I/F,
+the generic thermal driver also creates a hwmon sysfs I/F for each _type_
+of thermal zone device. E.g. the generic thermal driver registers one hwmon
+class device and build the associated hwmon sysfs I/F for all the registered
+ACPI thermal zones.
+
+Please read Documentation/ABI/testing/sysfs-class-thermal for thermal
+zone and cooling device attribute details.
+
+::
+
+ /sys/class/hwmon/hwmon[0-*]:
+ |---name: The type of the thermal zone devices
+ |---temp[1-*]_input: The current temperature of thermal zone [1-*]
+ |---temp[1-*]_critical: The critical trip point of thermal zone [1-*]
+
+Please read Documentation/hwmon/sysfs-interface.rst for additional information.
+
+3. A simple implementation
+==========================
+
+ACPI thermal zone may support multiple trip points like critical, hot,
+passive, active. If an ACPI thermal zone supports critical, passive,
+active[0] and active[1] at the same time, it may register itself as a
+thermal_zone_device (thermal_zone1) with 4 trip points in all.
+It has one processor and one fan, which are both registered as
+thermal_cooling_device. Both are considered to have the same
+effectiveness in cooling the thermal zone.
+
+If the processor is listed in _PSL method, and the fan is listed in _AL0
+method, the sys I/F structure will be built like this::
+
+ /sys/class/thermal:
+ |thermal_zone1:
+ |---type: acpitz
+ |---temp: 37000
+ |---mode: enabled
+ |---policy: step_wise
+ |---available_policies: step_wise fair_share
+ |---trip_point_0_temp: 100000
+ |---trip_point_0_type: critical
+ |---trip_point_1_temp: 80000
+ |---trip_point_1_type: passive
+ |---trip_point_2_temp: 70000
+ |---trip_point_2_type: active0
+ |---trip_point_3_temp: 60000
+ |---trip_point_3_type: active1
+ |---cdev0: --->/sys/class/thermal/cooling_device0
+ |---cdev0_trip_point: 1 /* cdev0 can be used for passive */
+ |---cdev0_weight: 1024
+ |---cdev1: --->/sys/class/thermal/cooling_device3
+ |---cdev1_trip_point: 2 /* cdev1 can be used for active[0]*/
+ |---cdev1_weight: 1024
+
+ |cooling_device0:
+ |---type: Processor
+ |---max_state: 8
+ |---cur_state: 0
+
+ |cooling_device3:
+ |---type: Fan
+ |---max_state: 2
+ |---cur_state: 0
+
+ /sys/class/hwmon:
+ |hwmon0:
+ |---name: acpitz
+ |---temp1_input: 37000
+ |---temp1_crit: 100000
+
+4. Export Symbol APIs
+=====================
+
+4.1. get_tz_trend
+-----------------
+
+This function returns the trend of a thermal zone, i.e the rate of change
+of temperature of the thermal zone. Ideally, the thermal sensor drivers
+are supposed to implement the callback. If they don't, the thermal
+framework calculated the trend by comparing the previous and the current
+temperature values.
+
+4.2. get_thermal_instance
+-------------------------
+
+This function returns the thermal_instance corresponding to a given
+{thermal_zone, cooling_device, trip_point} combination. Returns NULL
+if such an instance does not exist.
+
+4.3. thermal_cdev_update
+------------------------
+
+This function serves as an arbitrator to set the state of a cooling
+device. It sets the cooling device to the deepest cooling state if
+possible.
+
+5. thermal_emergency_poweroff
+=============================
+
+On an event of critical trip temperature crossing the thermal framework
+shuts down the system by calling hw_protection_shutdown(). The
+hw_protection_shutdown() first attempts to perform an orderly shutdown
+but accepts a delay after which it proceeds doing a forced power-off
+or as last resort an emergency_restart.
+
+The delay should be carefully profiled so as to give adequate time for
+orderly poweroff.
+
+If the delay is set to 0 emergency poweroff will not be supported. So a
+carefully profiled non-zero positive value is a must for emergency
+poweroff to be triggered.
diff --git a/Documentation/driver-api/thermal/x86_pkg_temperature_thermal.rst b/Documentation/driver-api/thermal/x86_pkg_temperature_thermal.rst
new file mode 100644
index 0000000000..2ac42ccd23
--- /dev/null
+++ b/Documentation/driver-api/thermal/x86_pkg_temperature_thermal.rst
@@ -0,0 +1,55 @@
+===================================
+Kernel driver: x86_pkg_temp_thermal
+===================================
+
+Supported chips:
+
+* x86: with package level thermal management
+
+(Verify using: CPUID.06H:EAX[bit 6] =1)
+
+Authors: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
+
+Reference
+---------
+
+Intel® 64 and IA-32 Architectures Software Developer’s Manual (Jan, 2013):
+Chapter 14.6: PACKAGE LEVEL THERMAL MANAGEMENT
+
+Description
+-----------
+
+This driver register CPU digital temperature package level sensor as a thermal
+zone with maximum two user mode configurable trip points. Number of trip points
+depends on the capability of the package. Once the trip point is violated,
+user mode can receive notification via thermal notification mechanism and can
+take any action to control temperature.
+
+
+Threshold management
+--------------------
+Each package will register as a thermal zone under /sys/class/thermal.
+
+Example::
+
+ /sys/class/thermal/thermal_zone1
+
+This contains two trip points:
+
+- trip_point_0_temp
+- trip_point_1_temp
+
+User can set any temperature between 0 to TJ-Max temperature. Temperature units
+are in milli-degree Celsius. Refer to "Documentation/driver-api/thermal/sysfs-api.rst" for
+thermal sys-fs details.
+
+Any value other than 0 in these trip points, can trigger thermal notifications.
+Setting 0, stops sending thermal notifications.
+
+Thermal notifications:
+To get kobject-uevent notifications, set the thermal zone
+policy to "user_space".
+
+For example::
+
+ echo -n "user_space" > policy
diff --git a/Documentation/driver-api/tty/index.rst b/Documentation/driver-api/tty/index.rst
new file mode 100644
index 0000000000..2d32606a42
--- /dev/null
+++ b/Documentation/driver-api/tty/index.rst
@@ -0,0 +1,73 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===
+TTY
+===
+
+Teletypewriter (TTY) layer takes care of all those serial devices. Including
+the virtual ones like pseudoterminal (PTY).
+
+TTY structures
+==============
+
+There are several major TTY structures. Every TTY device in a system has a
+corresponding struct tty_port. These devices are maintained by a TTY driver
+which is struct tty_driver. This structure describes the driver but also
+contains a reference to operations which could be performed on the TTYs. It is
+struct tty_operations. Then, upon open, a struct tty_struct is allocated and
+lives until the final close. During this time, several callbacks from struct
+tty_operations are invoked by the TTY layer.
+
+Every character received by the kernel (both from devices and users) is passed
+through a preselected :doc:`tty_ldisc` (in
+short ldisc; in C, struct tty_ldisc_ops). Its task is to transform characters
+as defined by a particular ldisc or by user too. The default one is n_tty,
+implementing echoes, signal handling, jobs control, special characters
+processing, and more. The transformed characters are passed further to
+user/device, depending on the source.
+
+In-detail description of the named TTY structures is in separate documents:
+
+.. toctree::
+ :maxdepth: 2
+
+ tty_driver
+ tty_port
+ tty_struct
+ tty_ldisc
+ tty_buffer
+ tty_internals
+
+Writing TTY Driver
+==================
+
+Before one starts writing a TTY driver, they must consider
+:doc:`Serial <../serial/driver>` and :doc:`USB Serial <../../usb/usb-serial>`
+layers first. Drivers for serial devices can often use one of these specific
+layers to implement a serial driver. Only special devices should be handled
+directly by the TTY Layer. If you are about to write such a driver, read on.
+
+A *typical* sequence a TTY driver performs is as follows:
+
+#. Allocate and register a TTY driver (module init)
+#. Create and register TTY devices as they are probed (probe function)
+#. Handle TTY operations and events like interrupts (TTY core invokes the
+ former, the device the latter)
+#. Remove devices as they are going away (remove function)
+#. Unregister and free the TTY driver (module exit)
+
+Steps regarding driver, i.e. 1., 3., and 5. are described in detail in
+:doc:`tty_driver`. For the other two (devices handling), look into
+:doc:`tty_port`.
+
+Other Documentation
+===================
+
+Miscellaneous documentation can be further found in these documents:
+
+.. toctree::
+ :maxdepth: 2
+
+ moxa-smartio
+ n_gsm
+ n_tty
diff --git a/Documentation/driver-api/tty/moxa-smartio.rst b/Documentation/driver-api/tty/moxa-smartio.rst
new file mode 100644
index 0000000000..af25bc5cc3
--- /dev/null
+++ b/Documentation/driver-api/tty/moxa-smartio.rst
@@ -0,0 +1,197 @@
+=============================================================
+MOXA Smartio/Industio Family Device Driver Installation Guide
+=============================================================
+
+Copyright (C) 2008, Moxa Inc.
+Copyright (C) 2021, Jiri Slaby
+
+.. Content
+
+ 1. Introduction
+ 2. System Requirement
+ 3. Installation
+ 3.1 Hardware installation
+ 3.2 Device naming convention
+ 4. Utilities
+ 5. Setserial
+ 6. Troubleshooting
+
+1. Introduction
+^^^^^^^^^^^^^^^
+
+ The Smartio/Industio/UPCI family Linux driver supports following multiport
+ boards:
+
+ - 2 ports multiport board
+ CP-102U, CP-102UL, CP-102UF
+ CP-132U-I, CP-132UL,
+ CP-132, CP-132I, CP132S, CP-132IS,
+ (CP-102, CP-102S)
+
+ - 4 ports multiport board
+ CP-104EL,
+ CP-104UL, CP-104JU,
+ CP-134U, CP-134U-I,
+ C104H/PCI, C104HS/PCI,
+ CP-114, CP-114I, CP-114S, CP-114IS, CP-114UL,
+ (C114HI, CT-114I),
+ POS-104UL,
+ CB-114,
+ CB-134I
+
+ - 8 ports multiport board
+ CP-118EL, CP-168EL,
+ CP-118U, CP-168U,
+ C168H/PCI,
+ CB-108
+
+ If a compatibility problem occurs, please contact Moxa at
+ support@moxa.com.tw.
+
+ In addition to device driver, useful utilities are also provided in this
+ version. They are:
+
+ - msdiag
+ Diagnostic program for displaying installed Moxa
+ Smartio/Industio boards.
+ - msmon
+ Monitor program to observe data count and line status signals.
+ - msterm A simple terminal program which is useful in testing serial
+ ports.
+
+ All the drivers and utilities are published in form of source code under
+ GNU General Public License in this version. Please refer to GNU General
+ Public License announcement in each source code file for more detail.
+
+ In Moxa's Web sites, you may always find the latest driver at
+ https://www.moxa.com/.
+
+ This version of driver can be installed as a Loadable Module (Module driver)
+ or built-in into kernel (Static driver). Before you install the driver,
+ please refer to hardware installation procedure in the User's Manual.
+
+ We assume the user should be familiar with following documents:
+
+ - Serial-HOWTO
+ - Kernel-HOWTO
+
+2. System Requirement
+^^^^^^^^^^^^^^^^^^^^^
+
+ - Maximum 4 boards can be installed in combination
+
+3. Installation
+^^^^^^^^^^^^^^^
+
+3.1 Hardware installation
+=========================
+
+PCI/UPCI board
+--------------
+
+ You may need to adjust IRQ usage in BIOS to avoid IRQ conflict with other
+ ISA devices. Please refer to hardware installation procedure in User's
+ Manual in advance.
+
+PCI IRQ Sharing
+---------------
+
+ Each port within the same multiport board shares the same IRQ. Up to
+ 4 Moxa Smartio/Industio PCI Family multiport boards can be installed
+ together on one system and they can share the same IRQ.
+
+
+
+3.2 Device naming convention
+============================
+
+ The device node is named "ttyMxx".
+
+Device naming when more than 2 boards installed
+-----------------------------------------------
+
+ Naming convention for each Smartio/Industio multiport board is
+ pre-defined as below.
+
+ ============ ===============
+ Board Num. Device node
+ 1st board ttyM0 - ttyM7
+ 2nd board ttyM8 - ttyM15
+ 3rd board ttyM16 - ttyM23
+ 4th board ttyM24 - ttyM31
+ ============ ===============
+
+4. Utilities
+^^^^^^^^^^^^
+
+ There are 3 utilities contained in this driver. They are msdiag, msmon and
+ msterm. These 3 utilities are released in form of source code. They should
+ be compiled into executable file and copied into /usr/bin.
+
+msdiag - Diagnostic
+===================
+
+ This utility provides the function to display what Moxa Smartio/Industio
+ board was found by the driver in the system.
+
+msmon - Port Monitoring
+=======================
+
+ This utility gives the user a quick view about all the MOXA ports'
+ activities. One can easily learn each port's total received/transmitted
+ (Rx/Tx) character count since the time when the monitoring is started.
+
+ Rx/Tx throughputs per second are also reported in interval basis (e.g.
+ the last 5 seconds) and in average basis (since the time the monitoring
+ is started). You can reset all ports' count by <HOME> key. <+> <->
+ (plus/minus) keys to change the displaying time interval. Press <ENTER>
+ on the port, that cursor stay, to view the port's communication
+ parameters, signal status, and input/output queue.
+
+msterm - Terminal Emulation
+===========================
+
+ This utility provides data sending and receiving ability of all tty ports,
+ especially for MOXA ports. It is quite useful for testing simple
+ application, for example, sending AT command to a modem connected to the
+ port or used as a terminal for login purpose. Note that this is only a
+ dumb terminal emulation without handling full screen operation.
+
+5. Setserial
+^^^^^^^^^^^^
+
+ Supported Setserial parameters are listed as below.
+
+ ============== =============================================================
+ uart set UART type(16450 --> disable FIFO, 16550A --> enable FIFO)
+ close_delay set the amount of time (in 1/100 of a second) that DTR
+ should be kept low while being closed.
+ closing_wait set the amount of time (in 1/100 of a second) that the
+ serial port should wait for data to be drained while
+ being closed, before the receiver is disabled.
+ spd_hi Use 57.6kb when the application requests 38.4kb.
+ spd_vhi Use 115.2kb when the application requests 38.4kb.
+ spd_shi Use 230.4kb when the application requests 38.4kb.
+ spd_warp Use 460.8kb when the application requests 38.4kb.
+ spd_normal Use 38.4kb when the application requests 38.4kb.
+ spd_cust Use the custom divisor to set the speed when the
+ application requests 38.4kb.
+ divisor This option sets the custom division.
+ baud_base This option sets the base baud rate.
+ ============== =============================================================
+
+6. Troubleshooting
+^^^^^^^^^^^^^^^^^^
+
+ The boot time error messages and solutions are stated as clearly as
+ possible. If all the possible solutions fail, please contact our technical
+ support team to get more help.
+
+
+ Error msg:
+ More than 4 Moxa Smartio/Industio family boards found. Fifth board
+ and after are ignored.
+
+ Solution:
+ To avoid this problem, please unplug fifth and after board, because Moxa
+ driver supports up to 4 boards.
diff --git a/Documentation/driver-api/tty/n_gsm.rst b/Documentation/driver-api/tty/n_gsm.rst
new file mode 100644
index 0000000000..120317ec99
--- /dev/null
+++ b/Documentation/driver-api/tty/n_gsm.rst
@@ -0,0 +1,192 @@
+==============================
+GSM 0710 tty multiplexor HOWTO
+==============================
+
+.. contents:: :local:
+
+This line discipline implements the GSM 07.10 multiplexing protocol
+detailed in the following 3GPP document:
+
+ https://www.3gpp.org/ftp/Specs/archive/07_series/07.10/0710-720.zip
+
+This document give some hints on how to use this driver with GPRS and 3G
+modems connected to a physical serial port.
+
+How to use it
+=============
+
+Config Initiator
+----------------
+
+#. Initialize the modem in 0710 mux mode (usually ``AT+CMUX=`` command) through
+ its serial port. Depending on the modem used, you can pass more or less
+ parameters to this command.
+
+#. Switch the serial line to using the n_gsm line discipline by using
+ ``TIOCSETD`` ioctl.
+
+#. Configure the mux using ``GSMIOC_GETCONF_EXT``/``GSMIOC_SETCONF_EXT`` ioctl if needed.
+
+#. Configure the mux using ``GSMIOC_GETCONF``/``GSMIOC_SETCONF`` ioctl.
+
+#. Configure DLCs using ``GSMIOC_GETCONF_DLCI``/``GSMIOC_SETCONF_DLCI`` ioctl for non-defaults.
+
+#. Obtain base gsmtty number for the used serial port.
+
+ Major parts of the initialization program
+ (a good starting point is util-linux-ng/sys-utils/ldattach.c)::
+
+ #include <stdio.h>
+ #include <stdint.h>
+ #include <linux/gsmmux.h>
+ #include <linux/tty.h>
+
+ #define DEFAULT_SPEED B115200
+ #define SERIAL_PORT /dev/ttyS0
+
+ int ldisc = N_GSM0710;
+ struct gsm_config c;
+ struct gsm_config_ext ce;
+ struct gsm_dlci_config dc;
+ struct termios configuration;
+ uint32_t first;
+
+ /* open the serial port connected to the modem */
+ fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
+
+ /* configure the serial port : speed, flow control ... */
+
+ /* send the AT commands to switch the modem to CMUX mode
+ and check that it's successful (should return OK) */
+ write(fd, "AT+CMUX=0\r", 10);
+
+ /* experience showed that some modems need some time before
+ being able to answer to the first MUX packet so a delay
+ may be needed here in some case */
+ sleep(3);
+
+ /* use n_gsm line discipline */
+ ioctl(fd, TIOCSETD, &ldisc);
+
+ /* get n_gsm extended configuration */
+ ioctl(fd, GSMIOC_GETCONF_EXT, &ce);
+ /* use keep-alive once every 5s for modem connection supervision */
+ ce.keep_alive = 500;
+ /* set the new extended configuration */
+ ioctl(fd, GSMIOC_SETCONF_EXT, &ce);
+ /* get n_gsm configuration */
+ ioctl(fd, GSMIOC_GETCONF, &c);
+ /* we are initiator and need encoding 0 (basic) */
+ c.initiator = 1;
+ c.encapsulation = 0;
+ /* our modem defaults to a maximum size of 127 bytes */
+ c.mru = 127;
+ c.mtu = 127;
+ /* set the new configuration */
+ ioctl(fd, GSMIOC_SETCONF, &c);
+ /* get DLC 1 configuration */
+ dc.channel = 1;
+ ioctl(fd, GSMIOC_GETCONF_DLCI, &dc);
+ /* the first user channel gets a higher priority */
+ dc.priority = 1;
+ /* set the new DLC 1 specific configuration */
+ ioctl(fd, GSMIOC_SETCONF_DLCI, &dc);
+ /* get first gsmtty device node */
+ ioctl(fd, GSMIOC_GETFIRST, &first);
+ printf("first muxed line: /dev/gsmtty%i\n", first);
+
+ /* and wait for ever to keep the line discipline enabled */
+ daemon(0,0);
+ pause();
+
+#. Use these devices as plain serial ports.
+
+ For example, it's possible:
+
+ - to use *gnokii* to send / receive SMS on ``ttygsm1``
+ - to use *ppp* to establish a datalink on ``ttygsm2``
+
+#. First close all virtual ports before closing the physical port.
+
+ Note that after closing the physical port the modem is still in multiplexing
+ mode. This may prevent a successful re-opening of the port later. To avoid
+ this situation either reset the modem if your hardware allows that or send
+ a disconnect command frame manually before initializing the multiplexing mode
+ for the second time. The byte sequence for the disconnect command frame is::
+
+ 0xf9, 0x03, 0xef, 0x03, 0xc3, 0x16, 0xf9
+
+Config Requester
+----------------
+
+#. Receive ``AT+CMUX=`` command through its serial port, initialize mux mode
+ config.
+
+#. Switch the serial line to using the *n_gsm* line discipline by using
+ ``TIOCSETD`` ioctl.
+
+#. Configure the mux using ``GSMIOC_GETCONF_EXT``/``GSMIOC_SETCONF_EXT``
+ ioctl if needed.
+
+#. Configure the mux using ``GSMIOC_GETCONF``/``GSMIOC_SETCONF`` ioctl.
+
+#. Configure DLCs using ``GSMIOC_GETCONF_DLCI``/``GSMIOC_SETCONF_DLCI`` ioctl for non-defaults.
+
+#. Obtain base gsmtty number for the used serial port::
+
+ #include <stdio.h>
+ #include <stdint.h>
+ #include <linux/gsmmux.h>
+ #include <linux/tty.h>
+ #define DEFAULT_SPEED B115200
+ #define SERIAL_PORT /dev/ttyS0
+
+ int ldisc = N_GSM0710;
+ struct gsm_config c;
+ struct gsm_config_ext ce;
+ struct gsm_dlci_config dc;
+ struct termios configuration;
+ uint32_t first;
+
+ /* open the serial port */
+ fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
+
+ /* configure the serial port : speed, flow control ... */
+
+ /* get serial data and check "AT+CMUX=command" parameter ... */
+
+ /* use n_gsm line discipline */
+ ioctl(fd, TIOCSETD, &ldisc);
+
+ /* get n_gsm extended configuration */
+ ioctl(fd, GSMIOC_GETCONF_EXT, &ce);
+ /* use keep-alive once every 5s for peer connection supervision */
+ ce.keep_alive = 500;
+ /* set the new extended configuration */
+ ioctl(fd, GSMIOC_SETCONF_EXT, &ce);
+ /* get n_gsm configuration */
+ ioctl(fd, GSMIOC_GETCONF, &c);
+ /* we are requester and need encoding 0 (basic) */
+ c.initiator = 0;
+ c.encapsulation = 0;
+ /* our modem defaults to a maximum size of 127 bytes */
+ c.mru = 127;
+ c.mtu = 127;
+ /* set the new configuration */
+ ioctl(fd, GSMIOC_SETCONF, &c);
+ /* get DLC 1 configuration */
+ dc.channel = 1;
+ ioctl(fd, GSMIOC_GETCONF_DLCI, &dc);
+ /* the first user channel gets a higher priority */
+ dc.priority = 1;
+ /* set the new DLC 1 specific configuration */
+ ioctl(fd, GSMIOC_SETCONF_DLCI, &dc);
+ /* get first gsmtty device node */
+ ioctl(fd, GSMIOC_GETFIRST, &first);
+ printf("first muxed line: /dev/gsmtty%i\n", first);
+
+ /* and wait for ever to keep the line discipline enabled */
+ daemon(0,0);
+ pause();
+
+11-03-08 - Eric Bénard - <eric@eukrea.com>
diff --git a/Documentation/driver-api/tty/n_tty.rst b/Documentation/driver-api/tty/n_tty.rst
new file mode 100644
index 0000000000..15b70faee7
--- /dev/null
+++ b/Documentation/driver-api/tty/n_tty.rst
@@ -0,0 +1,22 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=====
+N_TTY
+=====
+
+.. contents:: :local:
+
+The default (and fallback) :doc:`TTY line discipline <tty_ldisc>`. It tries to
+handle characters as per POSIX.
+
+External Functions
+==================
+
+.. kernel-doc:: drivers/tty/n_tty.c
+ :export:
+
+Internal Functions
+==================
+
+.. kernel-doc:: drivers/tty/n_tty.c
+ :internal:
diff --git a/Documentation/driver-api/tty/tty_buffer.rst b/Documentation/driver-api/tty/tty_buffer.rst
new file mode 100644
index 0000000000..4b5ca1776d
--- /dev/null
+++ b/Documentation/driver-api/tty/tty_buffer.rst
@@ -0,0 +1,49 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==========
+TTY Buffer
+==========
+
+.. contents:: :local:
+
+Here, we document functions for taking care of tty buffer and their flipping.
+Drivers are supposed to fill the buffer by one of those functions below and
+then flip the buffer, so that the data are passed to :doc:`line discipline
+<tty_ldisc>` for further processing.
+
+Flip Buffer Management
+======================
+
+.. kernel-doc:: drivers/tty/tty_buffer.c
+ :identifiers: tty_prepare_flip_string
+ tty_flip_buffer_push tty_ldisc_receive_buf
+
+.. kernel-doc:: include/linux/tty_flip.h
+ :identifiers: tty_insert_flip_string_fixed_flag tty_insert_flip_string_flags
+ tty_insert_flip_char
+
+----
+
+Other Functions
+===============
+
+.. kernel-doc:: drivers/tty/tty_buffer.c
+ :identifiers: tty_buffer_space_avail tty_buffer_set_limit
+
+----
+
+Buffer Locking
+==============
+
+These are used only in special circumstances. Avoid them.
+
+.. kernel-doc:: drivers/tty/tty_buffer.c
+ :identifiers: tty_buffer_lock_exclusive tty_buffer_unlock_exclusive
+
+----
+
+Internal Functions
+==================
+
+.. kernel-doc:: drivers/tty/tty_buffer.c
+ :internal:
diff --git a/Documentation/driver-api/tty/tty_driver.rst b/Documentation/driver-api/tty/tty_driver.rst
new file mode 100644
index 0000000000..cc529f8634
--- /dev/null
+++ b/Documentation/driver-api/tty/tty_driver.rst
@@ -0,0 +1,128 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=============================
+TTY Driver and TTY Operations
+=============================
+
+.. contents:: :local:
+
+Allocation
+==========
+
+The first thing a driver needs to do is to allocate a struct tty_driver. This
+is done by tty_alloc_driver() (or __tty_alloc_driver()). Next, the newly
+allocated structure is filled with information. See `TTY Driver Reference`_ at
+the end of this document on what actually shall be filled in.
+
+The allocation routines expect a number of devices the driver can handle at
+most and flags. Flags are those starting ``TTY_DRIVER_`` listed and described
+in `TTY Driver Flags`_ below.
+
+When the driver is about to be freed, tty_driver_kref_put() is called on that.
+It will decrements the reference count and if it reaches zero, the driver is
+freed.
+
+For reference, both allocation and deallocation functions are explained here in
+detail:
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: __tty_alloc_driver tty_driver_kref_put
+
+TTY Driver Flags
+----------------
+
+Here comes the documentation of flags accepted by tty_alloc_driver() (or
+__tty_alloc_driver()):
+
+.. kernel-doc:: include/linux/tty_driver.h
+ :doc: TTY Driver Flags
+
+----
+
+Registration
+============
+
+When a struct tty_driver is allocated and filled in, it can be registered using
+tty_register_driver(). It is recommended to pass ``TTY_DRIVER_DYNAMIC_DEV`` in
+flags of tty_alloc_driver(). If it is not passed, *all* devices are also
+registered during tty_register_driver() and the following paragraph of
+registering devices can be skipped for such drivers. However, the struct
+tty_port part in `Registering Devices`_ is still relevant there.
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_register_driver tty_unregister_driver
+
+Registering Devices
+-------------------
+
+Every TTY device shall be backed by a struct tty_port. Usually, TTY drivers
+embed tty_port into device's private structures. Further details about handling
+tty_port can be found in :doc:`tty_port`. The driver is also recommended to use
+tty_port's reference counting by tty_port_get() and tty_port_put(). The final
+put is supposed to free the tty_port including the device's private struct.
+
+Unless ``TTY_DRIVER_DYNAMIC_DEV`` was passed as flags to tty_alloc_driver(),
+TTY driver is supposed to register every device discovered in the system
+(the latter is preferred). This is performed by tty_register_device(). Or by
+tty_register_device_attr() if the driver wants to expose some information
+through struct attribute_group. Both of them register ``index``'th device and
+upon return, the device can be opened. There are also preferred tty_port
+variants described in `Linking Devices to Ports`_ later. It is up to driver to
+manage free indices and choosing the right one. The TTY layer only refuses to
+register more devices than passed to tty_alloc_driver().
+
+When the device is opened, the TTY layer allocates struct tty_struct and starts
+calling operations from :c:member:`tty_driver.ops`, see `TTY Operations
+Reference`_.
+
+The registration routines are documented as follows:
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_register_device tty_register_device_attr
+ tty_unregister_device
+
+----
+
+Linking Devices to Ports
+------------------------
+As stated earlier, every TTY device shall have a struct tty_port assigned to
+it. It must be known to the TTY layer at :c:member:`tty_driver.ops.install()`
+at latest. There are few helpers to *link* the two. Ideally, the driver uses
+tty_port_register_device() or tty_port_register_device_attr() instead of
+tty_register_device() and tty_register_device_attr() at the registration time.
+This way, the driver needs not care about linking later on.
+
+If that is not possible, the driver still can link the tty_port to a specific
+index *before* the actual registration by tty_port_link_device(). If it still
+does not fit, tty_port_install() can be used from the
+:c:member:`tty_driver.ops.install` hook as a last resort. The last one is
+dedicated mostly for in-memory devices like PTY where tty_ports are allocated
+on demand.
+
+The linking routines are documented here:
+
+.. kernel-doc:: drivers/tty/tty_port.c
+ :identifiers: tty_port_link_device tty_port_register_device
+ tty_port_register_device_attr
+
+----
+
+TTY Driver Reference
+====================
+
+All members of struct tty_driver are documented here. The required members are
+noted at the end. struct tty_operations are documented next.
+
+.. kernel-doc:: include/linux/tty_driver.h
+ :identifiers: tty_driver
+
+----
+
+TTY Operations Reference
+========================
+
+When a TTY is registered, these driver hooks can be invoked by the TTY layer:
+
+.. kernel-doc:: include/linux/tty_driver.h
+ :identifiers: tty_operations
+
diff --git a/Documentation/driver-api/tty/tty_internals.rst b/Documentation/driver-api/tty/tty_internals.rst
new file mode 100644
index 0000000000..d0d4158203
--- /dev/null
+++ b/Documentation/driver-api/tty/tty_internals.rst
@@ -0,0 +1,31 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=============
+TTY Internals
+=============
+
+.. contents:: :local:
+
+Kopen
+=====
+
+These functions serve for opening a TTY from the kernelspace:
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_kopen_exclusive tty_kopen_shared tty_kclose
+
+----
+
+Exported Internal Functions
+===========================
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_release_struct tty_dev_name_to_number tty_get_icount
+
+----
+
+Internal Functions
+==================
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :internal:
diff --git a/Documentation/driver-api/tty/tty_ldisc.rst b/Documentation/driver-api/tty/tty_ldisc.rst
new file mode 100644
index 0000000000..5144751be8
--- /dev/null
+++ b/Documentation/driver-api/tty/tty_ldisc.rst
@@ -0,0 +1,85 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===================
+TTY Line Discipline
+===================
+
+.. contents:: :local:
+
+TTY line discipline process all incoming and outgoing character from/to a tty
+device. The default line discipline is :doc:`N_TTY <n_tty>`. It is also a
+fallback if establishing any other discipline for a tty fails. If even N_TTY
+fails, N_NULL takes over. That never fails, but also does not process any
+characters -- it throws them away.
+
+Registration
+============
+
+Line disciplines are registered with tty_register_ldisc() passing the ldisc
+structure. At the point of registration the discipline must be ready to use and
+it is possible it will get used before the call returns success. If the call
+returns an error then it won’t get called. Do not re-use ldisc numbers as they
+are part of the userspace ABI and writing over an existing ldisc will cause
+demons to eat your computer. You must not re-register over the top of the line
+discipline even with the same data or your computer again will be eaten by
+demons. In order to remove a line discipline call tty_unregister_ldisc().
+
+Heed this warning: the reference count field of the registered copies of the
+tty_ldisc structure in the ldisc table counts the number of lines using this
+discipline. The reference count of the tty_ldisc structure within a tty counts
+the number of active users of the ldisc at this instant. In effect it counts
+the number of threads of execution within an ldisc method (plus those about to
+enter and exit although this detail matters not).
+
+.. kernel-doc:: drivers/tty/tty_ldisc.c
+ :identifiers: tty_register_ldisc tty_unregister_ldisc
+
+Other Functions
+===============
+
+.. kernel-doc:: drivers/tty/tty_ldisc.c
+ :identifiers: tty_set_ldisc tty_ldisc_flush
+
+Line Discipline Operations Reference
+====================================
+
+.. kernel-doc:: include/linux/tty_ldisc.h
+ :identifiers: tty_ldisc_ops
+
+Driver Access
+=============
+
+Line discipline methods can call the methods of the underlying hardware driver.
+These are documented as a part of struct tty_operations.
+
+TTY Flags
+=========
+
+Line discipline methods have access to :c:member:`tty_struct.flags` field. See
+:doc:`tty_struct`.
+
+Locking
+=======
+
+Callers to the line discipline functions from the tty layer are required to
+take line discipline locks. The same is true of calls from the driver side
+but not yet enforced.
+
+.. kernel-doc:: drivers/tty/tty_ldisc.c
+ :identifiers: tty_ldisc_ref_wait tty_ldisc_ref tty_ldisc_deref
+
+While these functions are slightly slower than the old code they should have
+minimal impact as most receive logic uses the flip buffers and they only
+need to take a reference when they push bits up through the driver.
+
+A caution: The :c:member:`tty_ldisc_ops.open()`,
+:c:member:`tty_ldisc_ops.close()` and :c:member:`tty_driver.set_ldisc()`
+functions are called with the ldisc unavailable. Thus tty_ldisc_ref() will fail
+in this situation if used within these functions. Ldisc and driver code
+calling its own functions must be careful in this case.
+
+Internal Functions
+==================
+
+.. kernel-doc:: drivers/tty/tty_ldisc.c
+ :internal:
diff --git a/Documentation/driver-api/tty/tty_port.rst b/Documentation/driver-api/tty/tty_port.rst
new file mode 100644
index 0000000000..5cb90e954f
--- /dev/null
+++ b/Documentation/driver-api/tty/tty_port.rst
@@ -0,0 +1,70 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+========
+TTY Port
+========
+
+.. contents:: :local:
+
+The TTY drivers are advised to use struct tty_port helpers as much as possible.
+If the drivers implement :c:member:`tty_port.ops.activate()` and
+:c:member:`tty_port.ops.shutdown()`, they can use tty_port_open(),
+tty_port_close(), and tty_port_hangup() in respective
+:c:member:`tty_struct.ops` hooks.
+
+The reference and details are contained in the `TTY Port Reference`_ and `TTY
+Port Operations Reference`_ sections at the bottom.
+
+TTY Port Functions
+==================
+
+Init & Destroy
+--------------
+
+.. kernel-doc:: drivers/tty/tty_port.c
+ :identifiers: tty_port_init tty_port_destroy
+ tty_port_get tty_port_put
+
+Open/Close/Hangup Helpers
+-------------------------
+
+.. kernel-doc:: drivers/tty/tty_port.c
+ :identifiers: tty_port_install tty_port_open tty_port_block_til_ready
+ tty_port_close tty_port_close_start tty_port_close_end tty_port_hangup
+ tty_port_shutdown
+
+TTY Refcounting
+---------------
+
+.. kernel-doc:: drivers/tty/tty_port.c
+ :identifiers: tty_port_tty_get tty_port_tty_set
+
+TTY Helpers
+-----------
+
+.. kernel-doc:: drivers/tty/tty_port.c
+ :identifiers: tty_port_tty_hangup tty_port_tty_wakeup
+
+
+Modem Signals
+-------------
+
+.. kernel-doc:: drivers/tty/tty_port.c
+ :identifiers: tty_port_carrier_raised tty_port_raise_dtr_rts
+ tty_port_lower_dtr_rts
+
+----
+
+TTY Port Reference
+==================
+
+.. kernel-doc:: include/linux/tty_port.h
+ :identifiers: tty_port
+
+----
+
+TTY Port Operations Reference
+=============================
+
+.. kernel-doc:: include/linux/tty_port.h
+ :identifiers: tty_port_operations
diff --git a/Documentation/driver-api/tty/tty_struct.rst b/Documentation/driver-api/tty/tty_struct.rst
new file mode 100644
index 0000000000..c72f5a4293
--- /dev/null
+++ b/Documentation/driver-api/tty/tty_struct.rst
@@ -0,0 +1,81 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==========
+TTY Struct
+==========
+
+.. contents:: :local:
+
+struct tty_struct is allocated by the TTY layer upon the first open of the TTY
+device and released after the last close. The TTY layer passes this structure
+to most of struct tty_operation's hooks. Members of tty_struct are documented
+in `TTY Struct Reference`_ at the bottom.
+
+Initialization
+==============
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_init_termios
+
+Name
+====
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_name
+
+Reference counting
+==================
+
+.. kernel-doc:: include/linux/tty.h
+ :identifiers: tty_kref_get
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_kref_put
+
+Install
+=======
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_standard_install
+
+Read & Write
+============
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_put_char
+
+Start & Stop
+============
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: start_tty stop_tty
+
+Wakeup
+======
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_wakeup
+
+Hangup
+======
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_hangup tty_vhangup tty_hung_up_p
+
+Misc
+====
+
+.. kernel-doc:: drivers/tty/tty_io.c
+ :identifiers: tty_do_resize
+
+TTY Struct Flags
+================
+
+.. kernel-doc:: include/linux/tty.h
+ :doc: TTY Struct Flags
+
+TTY Struct Reference
+====================
+
+.. kernel-doc:: include/linux/tty.h
+ :identifiers: tty_struct
diff --git a/Documentation/driver-api/uio-howto.rst b/Documentation/driver-api/uio-howto.rst
new file mode 100644
index 0000000000..907ffa3b38
--- /dev/null
+++ b/Documentation/driver-api/uio-howto.rst
@@ -0,0 +1,730 @@
+=======================
+The Userspace I/O HOWTO
+=======================
+
+:Author: Hans-Jürgen Koch Linux developer, Linutronix
+:Date: 2006-12-11
+
+About this document
+===================
+
+Translations
+------------
+
+If you know of any translations for this document, or you are interested
+in translating it, please email me hjk@hansjkoch.de.
+
+Preface
+-------
+
+For many types of devices, creating a Linux kernel driver is overkill.
+All that is really needed is some way to handle an interrupt and provide
+access to the memory space of the device. The logic of controlling the
+device does not necessarily have to be within the kernel, as the device
+does not need to take advantage of any of other resources that the
+kernel provides. One such common class of devices that are like this are
+for industrial I/O cards.
+
+To address this situation, the userspace I/O system (UIO) was designed.
+For typical industrial I/O cards, only a very small kernel module is
+needed. The main part of the driver will run in user space. This
+simplifies development and reduces the risk of serious bugs within a
+kernel module.
+
+Please note that UIO is not an universal driver interface. Devices that
+are already handled well by other kernel subsystems (like networking or
+serial or USB) are no candidates for an UIO driver. Hardware that is
+ideally suited for an UIO driver fulfills all of the following:
+
+- The device has memory that can be mapped. The device can be
+ controlled completely by writing to this memory.
+
+- The device usually generates interrupts.
+
+- The device does not fit into one of the standard kernel subsystems.
+
+Acknowledgments
+---------------
+
+I'd like to thank Thomas Gleixner and Benedikt Spranger of Linutronix,
+who have not only written most of the UIO code, but also helped greatly
+writing this HOWTO by giving me all kinds of background information.
+
+Feedback
+--------
+
+Find something wrong with this document? (Or perhaps something right?) I
+would love to hear from you. Please email me at hjk@hansjkoch.de.
+
+About UIO
+=========
+
+If you use UIO for your card's driver, here's what you get:
+
+- only one small kernel module to write and maintain.
+
+- develop the main part of your driver in user space, with all the
+ tools and libraries you're used to.
+
+- bugs in your driver won't crash the kernel.
+
+- updates of your driver can take place without recompiling the kernel.
+
+How UIO works
+-------------
+
+Each UIO device is accessed through a device file and several sysfs
+attribute files. The device file will be called ``/dev/uio0`` for the
+first device, and ``/dev/uio1``, ``/dev/uio2`` and so on for subsequent
+devices.
+
+``/dev/uioX`` is used to access the address space of the card. Just use
+:c:func:`mmap()` to access registers or RAM locations of your card.
+
+Interrupts are handled by reading from ``/dev/uioX``. A blocking
+:c:func:`read()` from ``/dev/uioX`` will return as soon as an
+interrupt occurs. You can also use :c:func:`select()` on
+``/dev/uioX`` to wait for an interrupt. The integer value read from
+``/dev/uioX`` represents the total interrupt count. You can use this
+number to figure out if you missed some interrupts.
+
+For some hardware that has more than one interrupt source internally,
+but not separate IRQ mask and status registers, there might be
+situations where userspace cannot determine what the interrupt source
+was if the kernel handler disables them by writing to the chip's IRQ
+register. In such a case, the kernel has to disable the IRQ completely
+to leave the chip's register untouched. Now the userspace part can
+determine the cause of the interrupt, but it cannot re-enable
+interrupts. Another cornercase is chips where re-enabling interrupts is
+a read-modify-write operation to a combined IRQ status/acknowledge
+register. This would be racy if a new interrupt occurred simultaneously.
+
+To address these problems, UIO also implements a write() function. It is
+normally not used and can be ignored for hardware that has only a single
+interrupt source or has separate IRQ mask and status registers. If you
+need it, however, a write to ``/dev/uioX`` will call the
+:c:func:`irqcontrol()` function implemented by the driver. You have
+to write a 32-bit value that is usually either 0 or 1 to disable or
+enable interrupts. If a driver does not implement
+:c:func:`irqcontrol()`, :c:func:`write()` will return with
+``-ENOSYS``.
+
+To handle interrupts properly, your custom kernel module can provide its
+own interrupt handler. It will automatically be called by the built-in
+handler.
+
+For cards that don't generate interrupts but need to be polled, there is
+the possibility to set up a timer that triggers the interrupt handler at
+configurable time intervals. This interrupt simulation is done by
+calling :c:func:`uio_event_notify()` from the timer's event
+handler.
+
+Each driver provides attributes that are used to read or write
+variables. These attributes are accessible through sysfs files. A custom
+kernel driver module can add its own attributes to the device owned by
+the uio driver, but not added to the UIO device itself at this time.
+This might change in the future if it would be found to be useful.
+
+The following standard attributes are provided by the UIO framework:
+
+- ``name``: The name of your device. It is recommended to use the name
+ of your kernel module for this.
+
+- ``version``: A version string defined by your driver. This allows the
+ user space part of your driver to deal with different versions of the
+ kernel module.
+
+- ``event``: The total number of interrupts handled by the driver since
+ the last time the device node was read.
+
+These attributes appear under the ``/sys/class/uio/uioX`` directory.
+Please note that this directory might be a symlink, and not a real
+directory. Any userspace code that accesses it must be able to handle
+this.
+
+Each UIO device can make one or more memory regions available for memory
+mapping. This is necessary because some industrial I/O cards require
+access to more than one PCI memory region in a driver.
+
+Each mapping has its own directory in sysfs, the first mapping appears
+as ``/sys/class/uio/uioX/maps/map0/``. Subsequent mappings create
+directories ``map1/``, ``map2/``, and so on. These directories will only
+appear if the size of the mapping is not 0.
+
+Each ``mapX/`` directory contains four read-only files that show
+attributes of the memory:
+
+- ``name``: A string identifier for this mapping. This is optional, the
+ string can be empty. Drivers can set this to make it easier for
+ userspace to find the correct mapping.
+
+- ``addr``: The address of memory that can be mapped.
+
+- ``size``: The size, in bytes, of the memory pointed to by addr.
+
+- ``offset``: The offset, in bytes, that has to be added to the pointer
+ returned by :c:func:`mmap()` to get to the actual device memory.
+ This is important if the device's memory is not page aligned.
+ Remember that pointers returned by :c:func:`mmap()` are always
+ page aligned, so it is good style to always add this offset.
+
+From userspace, the different mappings are distinguished by adjusting
+the ``offset`` parameter of the :c:func:`mmap()` call. To map the
+memory of mapping N, you have to use N times the page size as your
+offset::
+
+ offset = N * getpagesize();
+
+Sometimes there is hardware with memory-like regions that can not be
+mapped with the technique described here, but there are still ways to
+access them from userspace. The most common example are x86 ioports. On
+x86 systems, userspace can access these ioports using
+:c:func:`ioperm()`, :c:func:`iopl()`, :c:func:`inb()`,
+:c:func:`outb()`, and similar functions.
+
+Since these ioport regions can not be mapped, they will not appear under
+``/sys/class/uio/uioX/maps/`` like the normal memory described above.
+Without information about the port regions a hardware has to offer, it
+becomes difficult for the userspace part of the driver to find out which
+ports belong to which UIO device.
+
+To address this situation, the new directory
+``/sys/class/uio/uioX/portio/`` was added. It only exists if the driver
+wants to pass information about one or more port regions to userspace.
+If that is the case, subdirectories named ``port0``, ``port1``, and so
+on, will appear underneath ``/sys/class/uio/uioX/portio/``.
+
+Each ``portX/`` directory contains four read-only files that show name,
+start, size, and type of the port region:
+
+- ``name``: A string identifier for this port region. The string is
+ optional and can be empty. Drivers can set it to make it easier for
+ userspace to find a certain port region.
+
+- ``start``: The first port of this region.
+
+- ``size``: The number of ports in this region.
+
+- ``porttype``: A string describing the type of port.
+
+Writing your own kernel module
+==============================
+
+Please have a look at ``uio_cif.c`` as an example. The following
+paragraphs explain the different sections of this file.
+
+struct uio_info
+---------------
+
+This structure tells the framework the details of your driver, Some of
+the members are required, others are optional.
+
+- ``const char *name``: Required. The name of your driver as it will
+ appear in sysfs. I recommend using the name of your module for this.
+
+- ``const char *version``: Required. This string appears in
+ ``/sys/class/uio/uioX/version``.
+
+- ``struct uio_mem mem[ MAX_UIO_MAPS ]``: Required if you have memory
+ that can be mapped with :c:func:`mmap()`. For each mapping you
+ need to fill one of the ``uio_mem`` structures. See the description
+ below for details.
+
+- ``struct uio_port port[ MAX_UIO_PORTS_REGIONS ]``: Required if you
+ want to pass information about ioports to userspace. For each port
+ region you need to fill one of the ``uio_port`` structures. See the
+ description below for details.
+
+- ``long irq``: Required. If your hardware generates an interrupt, it's
+ your modules task to determine the irq number during initialization.
+ If you don't have a hardware generated interrupt but want to trigger
+ the interrupt handler in some other way, set ``irq`` to
+ ``UIO_IRQ_CUSTOM``. If you had no interrupt at all, you could set
+ ``irq`` to ``UIO_IRQ_NONE``, though this rarely makes sense.
+
+- ``unsigned long irq_flags``: Required if you've set ``irq`` to a
+ hardware interrupt number. The flags given here will be used in the
+ call to :c:func:`request_irq()`.
+
+- ``int (*mmap)(struct uio_info *info, struct vm_area_struct *vma)``:
+ Optional. If you need a special :c:func:`mmap()`
+ function, you can set it here. If this pointer is not NULL, your
+ :c:func:`mmap()` will be called instead of the built-in one.
+
+- ``int (*open)(struct uio_info *info, struct inode *inode)``:
+ Optional. You might want to have your own :c:func:`open()`,
+ e.g. to enable interrupts only when your device is actually used.
+
+- ``int (*release)(struct uio_info *info, struct inode *inode)``:
+ Optional. If you define your own :c:func:`open()`, you will
+ probably also want a custom :c:func:`release()` function.
+
+- ``int (*irqcontrol)(struct uio_info *info, s32 irq_on)``:
+ Optional. If you need to be able to enable or disable interrupts
+ from userspace by writing to ``/dev/uioX``, you can implement this
+ function. The parameter ``irq_on`` will be 0 to disable interrupts
+ and 1 to enable them.
+
+Usually, your device will have one or more memory regions that can be
+mapped to user space. For each region, you have to set up a
+``struct uio_mem`` in the ``mem[]`` array. Here's a description of the
+fields of ``struct uio_mem``:
+
+- ``const char *name``: Optional. Set this to help identify the memory
+ region, it will show up in the corresponding sysfs node.
+
+- ``int memtype``: Required if the mapping is used. Set this to
+ ``UIO_MEM_PHYS`` if you have physical memory on your card to be
+ mapped. Use ``UIO_MEM_LOGICAL`` for logical memory (e.g. allocated
+ with :c:func:`__get_free_pages()` but not kmalloc()). There's also
+ ``UIO_MEM_VIRTUAL`` for virtual memory.
+
+- ``phys_addr_t addr``: Required if the mapping is used. Fill in the
+ address of your memory block. This address is the one that appears in
+ sysfs.
+
+- ``resource_size_t size``: Fill in the size of the memory block that
+ ``addr`` points to. If ``size`` is zero, the mapping is considered
+ unused. Note that you *must* initialize ``size`` with zero for all
+ unused mappings.
+
+- ``void *internal_addr``: If you have to access this memory region
+ from within your kernel module, you will want to map it internally by
+ using something like :c:func:`ioremap()`. Addresses returned by
+ this function cannot be mapped to user space, so you must not store
+ it in ``addr``. Use ``internal_addr`` instead to remember such an
+ address.
+
+Please do not touch the ``map`` element of ``struct uio_mem``! It is
+used by the UIO framework to set up sysfs files for this mapping. Simply
+leave it alone.
+
+Sometimes, your device can have one or more port regions which can not
+be mapped to userspace. But if there are other possibilities for
+userspace to access these ports, it makes sense to make information
+about the ports available in sysfs. For each region, you have to set up
+a ``struct uio_port`` in the ``port[]`` array. Here's a description of
+the fields of ``struct uio_port``:
+
+- ``char *porttype``: Required. Set this to one of the predefined
+ constants. Use ``UIO_PORT_X86`` for the ioports found in x86
+ architectures.
+
+- ``unsigned long start``: Required if the port region is used. Fill in
+ the number of the first port of this region.
+
+- ``unsigned long size``: Fill in the number of ports in this region.
+ If ``size`` is zero, the region is considered unused. Note that you
+ *must* initialize ``size`` with zero for all unused regions.
+
+Please do not touch the ``portio`` element of ``struct uio_port``! It is
+used internally by the UIO framework to set up sysfs files for this
+region. Simply leave it alone.
+
+Adding an interrupt handler
+---------------------------
+
+What you need to do in your interrupt handler depends on your hardware
+and on how you want to handle it. You should try to keep the amount of
+code in your kernel interrupt handler low. If your hardware requires no
+action that you *have* to perform after each interrupt, then your
+handler can be empty.
+
+If, on the other hand, your hardware *needs* some action to be performed
+after each interrupt, then you *must* do it in your kernel module. Note
+that you cannot rely on the userspace part of your driver. Your
+userspace program can terminate at any time, possibly leaving your
+hardware in a state where proper interrupt handling is still required.
+
+There might also be applications where you want to read data from your
+hardware at each interrupt and buffer it in a piece of kernel memory
+you've allocated for that purpose. With this technique you could avoid
+loss of data if your userspace program misses an interrupt.
+
+A note on shared interrupts: Your driver should support interrupt
+sharing whenever this is possible. It is possible if and only if your
+driver can detect whether your hardware has triggered the interrupt or
+not. This is usually done by looking at an interrupt status register. If
+your driver sees that the IRQ bit is actually set, it will perform its
+actions, and the handler returns IRQ_HANDLED. If the driver detects
+that it was not your hardware that caused the interrupt, it will do
+nothing and return IRQ_NONE, allowing the kernel to call the next
+possible interrupt handler.
+
+If you decide not to support shared interrupts, your card won't work in
+computers with no free interrupts. As this frequently happens on the PC
+platform, you can save yourself a lot of trouble by supporting interrupt
+sharing.
+
+Using uio_pdrv for platform devices
+-----------------------------------
+
+In many cases, UIO drivers for platform devices can be handled in a
+generic way. In the same place where you define your
+``struct platform_device``, you simply also implement your interrupt
+handler and fill your ``struct uio_info``. A pointer to this
+``struct uio_info`` is then used as ``platform_data`` for your platform
+device.
+
+You also need to set up an array of ``struct resource`` containing
+addresses and sizes of your memory mappings. This information is passed
+to the driver using the ``.resource`` and ``.num_resources`` elements of
+``struct platform_device``.
+
+You now have to set the ``.name`` element of ``struct platform_device``
+to ``"uio_pdrv"`` to use the generic UIO platform device driver. This
+driver will fill the ``mem[]`` array according to the resources given,
+and register the device.
+
+The advantage of this approach is that you only have to edit a file you
+need to edit anyway. You do not have to create an extra driver.
+
+Using uio_pdrv_genirq for platform devices
+------------------------------------------
+
+Especially in embedded devices, you frequently find chips where the irq
+pin is tied to its own dedicated interrupt line. In such cases, where
+you can be really sure the interrupt is not shared, we can take the
+concept of ``uio_pdrv`` one step further and use a generic interrupt
+handler. That's what ``uio_pdrv_genirq`` does.
+
+The setup for this driver is the same as described above for
+``uio_pdrv``, except that you do not implement an interrupt handler. The
+``.handler`` element of ``struct uio_info`` must remain ``NULL``. The
+``.irq_flags`` element must not contain ``IRQF_SHARED``.
+
+You will set the ``.name`` element of ``struct platform_device`` to
+``"uio_pdrv_genirq"`` to use this driver.
+
+The generic interrupt handler of ``uio_pdrv_genirq`` will simply disable
+the interrupt line using :c:func:`disable_irq_nosync()`. After
+doing its work, userspace can reenable the interrupt by writing
+0x00000001 to the UIO device file. The driver already implements an
+:c:func:`irq_control()` to make this possible, you must not
+implement your own.
+
+Using ``uio_pdrv_genirq`` not only saves a few lines of interrupt
+handler code. You also do not need to know anything about the chip's
+internal registers to create the kernel part of the driver. All you need
+to know is the irq number of the pin the chip is connected to.
+
+When used in a device-tree enabled system, the driver needs to be
+probed with the ``"of_id"`` module parameter set to the ``"compatible"``
+string of the node the driver is supposed to handle. By default, the
+node's name (without the unit address) is exposed as name for the
+UIO device in userspace. To set a custom name, a property named
+``"linux,uio-name"`` may be specified in the DT node.
+
+Using uio_dmem_genirq for platform devices
+------------------------------------------
+
+In addition to statically allocated memory ranges, they may also be a
+desire to use dynamically allocated regions in a user space driver. In
+particular, being able to access memory made available through the
+dma-mapping API, may be particularly useful. The ``uio_dmem_genirq``
+driver provides a way to accomplish this.
+
+This driver is used in a similar manner to the ``"uio_pdrv_genirq"``
+driver with respect to interrupt configuration and handling.
+
+Set the ``.name`` element of ``struct platform_device`` to
+``"uio_dmem_genirq"`` to use this driver.
+
+When using this driver, fill in the ``.platform_data`` element of
+``struct platform_device``, which is of type
+``struct uio_dmem_genirq_pdata`` and which contains the following
+elements:
+
+- ``struct uio_info uioinfo``: The same structure used as the
+ ``uio_pdrv_genirq`` platform data
+
+- ``unsigned int *dynamic_region_sizes``: Pointer to list of sizes of
+ dynamic memory regions to be mapped into user space.
+
+- ``unsigned int num_dynamic_regions``: Number of elements in
+ ``dynamic_region_sizes`` array.
+
+The dynamic regions defined in the platform data will be appended to the
+`` mem[] `` array after the platform device resources, which implies
+that the total number of static and dynamic memory regions cannot exceed
+``MAX_UIO_MAPS``.
+
+The dynamic memory regions will be allocated when the UIO device file,
+``/dev/uioX`` is opened. Similar to static memory resources, the memory
+region information for dynamic regions is then visible via sysfs at
+``/sys/class/uio/uioX/maps/mapY/*``. The dynamic memory regions will be
+freed when the UIO device file is closed. When no processes are holding
+the device file open, the address returned to userspace is ~0.
+
+Writing a driver in userspace
+=============================
+
+Once you have a working kernel module for your hardware, you can write
+the userspace part of your driver. You don't need any special libraries,
+your driver can be written in any reasonable language, you can use
+floating point numbers and so on. In short, you can use all the tools
+and libraries you'd normally use for writing a userspace application.
+
+Getting information about your UIO device
+-----------------------------------------
+
+Information about all UIO devices is available in sysfs. The first thing
+you should do in your driver is check ``name`` and ``version`` to make
+sure you're talking to the right device and that its kernel driver has
+the version you expect.
+
+You should also make sure that the memory mapping you need exists and
+has the size you expect.
+
+There is a tool called ``lsuio`` that lists UIO devices and their
+attributes. It is available here:
+
+http://www.osadl.org/projects/downloads/UIO/user/
+
+With ``lsuio`` you can quickly check if your kernel module is loaded and
+which attributes it exports. Have a look at the manpage for details.
+
+The source code of ``lsuio`` can serve as an example for getting
+information about an UIO device. The file ``uio_helper.c`` contains a
+lot of functions you could use in your userspace driver code.
+
+mmap() device memory
+--------------------
+
+After you made sure you've got the right device with the memory mappings
+you need, all you have to do is to call :c:func:`mmap()` to map the
+device's memory to userspace.
+
+The parameter ``offset`` of the :c:func:`mmap()` call has a special
+meaning for UIO devices: It is used to select which mapping of your
+device you want to map. To map the memory of mapping N, you have to use
+N times the page size as your offset::
+
+ offset = N * getpagesize();
+
+N starts from zero, so if you've got only one memory range to map, set
+``offset = 0``. A drawback of this technique is that memory is always
+mapped beginning with its start address.
+
+Waiting for interrupts
+----------------------
+
+After you successfully mapped your devices memory, you can access it
+like an ordinary array. Usually, you will perform some initialization.
+After that, your hardware starts working and will generate an interrupt
+as soon as it's finished, has some data available, or needs your
+attention because an error occurred.
+
+``/dev/uioX`` is a read-only file. A :c:func:`read()` will always
+block until an interrupt occurs. There is only one legal value for the
+``count`` parameter of :c:func:`read()`, and that is the size of a
+signed 32 bit integer (4). Any other value for ``count`` causes
+:c:func:`read()` to fail. The signed 32 bit integer read is the
+interrupt count of your device. If the value is one more than the value
+you read the last time, everything is OK. If the difference is greater
+than one, you missed interrupts.
+
+You can also use :c:func:`select()` on ``/dev/uioX``.
+
+Generic PCI UIO driver
+======================
+
+The generic driver is a kernel module named uio_pci_generic. It can
+work with any device compliant to PCI 2.3 (circa 2002) and any compliant
+PCI Express device. Using this, you only need to write the userspace
+driver, removing the need to write a hardware-specific kernel module.
+
+Making the driver recognize the device
+--------------------------------------
+
+Since the driver does not declare any device ids, it will not get loaded
+automatically and will not automatically bind to any devices, you must
+load it and allocate id to the driver yourself. For example::
+
+ modprobe uio_pci_generic
+ echo "8086 10f5" > /sys/bus/pci/drivers/uio_pci_generic/new_id
+
+If there already is a hardware specific kernel driver for your device,
+the generic driver still won't bind to it, in this case if you want to
+use the generic driver (why would you?) you'll have to manually unbind
+the hardware specific driver and bind the generic driver, like this::
+
+ echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind
+ echo -n 0000:00:19.0 > /sys/bus/pci/drivers/uio_pci_generic/bind
+
+You can verify that the device has been bound to the driver by looking
+for it in sysfs, for example like the following::
+
+ ls -l /sys/bus/pci/devices/0000:00:19.0/driver
+
+Which if successful should print::
+
+ .../0000:00:19.0/driver -> ../../../bus/pci/drivers/uio_pci_generic
+
+Note that the generic driver will not bind to old PCI 2.2 devices. If
+binding the device failed, run the following command::
+
+ dmesg
+
+and look in the output for failure reasons.
+
+Things to know about uio_pci_generic
+------------------------------------
+
+Interrupts are handled using the Interrupt Disable bit in the PCI
+command register and Interrupt Status bit in the PCI status register.
+All devices compliant to PCI 2.3 (circa 2002) and all compliant PCI
+Express devices should support these bits. uio_pci_generic detects
+this support, and won't bind to devices which do not support the
+Interrupt Disable Bit in the command register.
+
+On each interrupt, uio_pci_generic sets the Interrupt Disable bit.
+This prevents the device from generating further interrupts until the
+bit is cleared. The userspace driver should clear this bit before
+blocking and waiting for more interrupts.
+
+Writing userspace driver using uio_pci_generic
+------------------------------------------------
+
+Userspace driver can use pci sysfs interface, or the libpci library that
+wraps it, to talk to the device and to re-enable interrupts by writing
+to the command register.
+
+Example code using uio_pci_generic
+----------------------------------
+
+Here is some sample userspace driver code using uio_pci_generic::
+
+ #include <stdlib.h>
+ #include <stdio.h>
+ #include <unistd.h>
+ #include <sys/types.h>
+ #include <sys/stat.h>
+ #include <fcntl.h>
+ #include <errno.h>
+
+ int main()
+ {
+ int uiofd;
+ int configfd;
+ int err;
+ int i;
+ unsigned icount;
+ unsigned char command_high;
+
+ uiofd = open("/dev/uio0", O_RDONLY);
+ if (uiofd < 0) {
+ perror("uio open:");
+ return errno;
+ }
+ configfd = open("/sys/class/uio/uio0/device/config", O_RDWR);
+ if (configfd < 0) {
+ perror("config open:");
+ return errno;
+ }
+
+ /* Read and cache command value */
+ err = pread(configfd, &command_high, 1, 5);
+ if (err != 1) {
+ perror("command config read:");
+ return errno;
+ }
+ command_high &= ~0x4;
+
+ for(i = 0;; ++i) {
+ /* Print out a message, for debugging. */
+ if (i == 0)
+ fprintf(stderr, "Started uio test driver.\n");
+ else
+ fprintf(stderr, "Interrupts: %d\n", icount);
+
+ /****************************************/
+ /* Here we got an interrupt from the
+ device. Do something to it. */
+ /****************************************/
+
+ /* Re-enable interrupts. */
+ err = pwrite(configfd, &command_high, 1, 5);
+ if (err != 1) {
+ perror("config write:");
+ break;
+ }
+
+ /* Wait for next interrupt. */
+ err = read(uiofd, &icount, 4);
+ if (err != 4) {
+ perror("uio read:");
+ break;
+ }
+
+ }
+ return errno;
+ }
+
+Generic Hyper-V UIO driver
+==========================
+
+The generic driver is a kernel module named uio_hv_generic. It
+supports devices on the Hyper-V VMBus similar to uio_pci_generic on
+PCI bus.
+
+Making the driver recognize the device
+--------------------------------------
+
+Since the driver does not declare any device GUID's, it will not get
+loaded automatically and will not automatically bind to any devices, you
+must load it and allocate id to the driver yourself. For example, to use
+the network device class GUID::
+
+ modprobe uio_hv_generic
+ echo "f8615163-df3e-46c5-913f-f2d2f965ed0e" > /sys/bus/vmbus/drivers/uio_hv_generic/new_id
+
+If there already is a hardware specific kernel driver for the device,
+the generic driver still won't bind to it, in this case if you want to
+use the generic driver for a userspace library you'll have to manually unbind
+the hardware specific driver and bind the generic driver, using the device specific GUID
+like this::
+
+ echo -n ed963694-e847-4b2a-85af-bc9cfc11d6f3 > /sys/bus/vmbus/drivers/hv_netvsc/unbind
+ echo -n ed963694-e847-4b2a-85af-bc9cfc11d6f3 > /sys/bus/vmbus/drivers/uio_hv_generic/bind
+
+You can verify that the device has been bound to the driver by looking
+for it in sysfs, for example like the following::
+
+ ls -l /sys/bus/vmbus/devices/ed963694-e847-4b2a-85af-bc9cfc11d6f3/driver
+
+Which if successful should print::
+
+ .../ed963694-e847-4b2a-85af-bc9cfc11d6f3/driver -> ../../../bus/vmbus/drivers/uio_hv_generic
+
+Things to know about uio_hv_generic
+-----------------------------------
+
+On each interrupt, uio_hv_generic sets the Interrupt Disable bit. This
+prevents the device from generating further interrupts until the bit is
+cleared. The userspace driver should clear this bit before blocking and
+waiting for more interrupts.
+
+When host rescinds a device, the interrupt file descriptor is marked down
+and any reads of the interrupt file descriptor will return -EIO. Similar
+to a closed socket or disconnected serial device.
+
+The vmbus device regions are mapped into uio device resources:
+ 0) Channel ring buffers: guest to host and host to guest
+ 1) Guest to host interrupt signalling pages
+ 2) Guest to host monitor page
+ 3) Network receive buffer region
+ 4) Network send buffer region
+
+If a subchannel is created by a request to host, then the uio_hv_generic
+device driver will create a sysfs binary file for the per-channel ring buffer.
+For example::
+
+ /sys/bus/vmbus/devices/3811fe4d-0fa0-4b62-981a-74fc1084c757/channels/21/ring
+
+Further information
+===================
+
+- `OSADL homepage. <http://www.osadl.org>`_
+
+- `Linutronix homepage. <http://www.linutronix.de>`_
diff --git a/Documentation/driver-api/usb/URB.rst b/Documentation/driver-api/usb/URB.rst
new file mode 100644
index 0000000000..a182c0f5e3
--- /dev/null
+++ b/Documentation/driver-api/usb/URB.rst
@@ -0,0 +1,290 @@
+.. _usb-urb:
+
+USB Request Block (URB)
+~~~~~~~~~~~~~~~~~~~~~~~
+
+:Revised: 2000-Dec-05
+:Again: 2002-Jul-06
+:Again: 2005-Sep-19
+:Again: 2017-Mar-29
+
+
+.. note::
+
+ The USB subsystem now has a substantial section at :ref:`usb-hostside-api`
+ section, generated from the current source code.
+ This particular documentation file isn't complete and may not be
+ updated to the last version; don't rely on it except for a quick
+ overview.
+
+Basic concept or 'What is an URB?'
+==================================
+
+The basic idea of the new driver is message passing, the message itself is
+called USB Request Block, or URB for short.
+
+- An URB consists of all relevant information to execute any USB transaction
+ and deliver the data and status back.
+
+- Execution of an URB is inherently an asynchronous operation, i.e. the
+ :c:func:`usb_submit_urb` call returns immediately after it has successfully
+ queued the requested action.
+
+- Transfers for one URB can be canceled with :c:func:`usb_unlink_urb`
+ at any time.
+
+- Each URB has a completion handler, which is called after the action
+ has been successfully completed or canceled. The URB also contains a
+ context-pointer for passing information to the completion handler.
+
+- Each endpoint for a device logically supports a queue of requests.
+ You can fill that queue, so that the USB hardware can still transfer
+ data to an endpoint while your driver handles completion of another.
+ This maximizes use of USB bandwidth, and supports seamless streaming
+ of data to (or from) devices when using periodic transfer modes.
+
+
+The URB structure
+=================
+
+Some of the fields in struct urb are::
+
+ struct urb
+ {
+ // (IN) device and pipe specify the endpoint queue
+ struct usb_device *dev; // pointer to associated USB device
+ unsigned int pipe; // endpoint information
+
+ unsigned int transfer_flags; // URB_ISO_ASAP, URB_SHORT_NOT_OK, etc.
+
+ // (IN) all urbs need completion routines
+ void *context; // context for completion routine
+ usb_complete_t complete; // pointer to completion routine
+
+ // (OUT) status after each completion
+ int status; // returned status
+
+ // (IN) buffer used for data transfers
+ void *transfer_buffer; // associated data buffer
+ u32 transfer_buffer_length; // data buffer length
+ int number_of_packets; // size of iso_frame_desc
+
+ // (OUT) sometimes only part of CTRL/BULK/INTR transfer_buffer is used
+ u32 actual_length; // actual data buffer length
+
+ // (IN) setup stage for CTRL (pass a struct usb_ctrlrequest)
+ unsigned char *setup_packet; // setup packet (control only)
+
+ // Only for PERIODIC transfers (ISO, INTERRUPT)
+ // (IN/OUT) start_frame is set unless URB_ISO_ASAP isn't set
+ int start_frame; // start frame
+ int interval; // polling interval
+
+ // ISO only: packets are only "best effort"; each can have errors
+ int error_count; // number of errors
+ struct usb_iso_packet_descriptor iso_frame_desc[0];
+ };
+
+Your driver must create the "pipe" value using values from the appropriate
+endpoint descriptor in an interface that it's claimed.
+
+
+How to get an URB?
+==================
+
+URBs are allocated by calling :c:func:`usb_alloc_urb`::
+
+ struct urb *usb_alloc_urb(int isoframes, int mem_flags)
+
+Return value is a pointer to the allocated URB, 0 if allocation failed.
+The parameter isoframes specifies the number of isochronous transfer frames
+you want to schedule. For CTRL/BULK/INT, use 0. The mem_flags parameter
+holds standard memory allocation flags, letting you control (among other
+things) whether the underlying code may block or not.
+
+To free an URB, use :c:func:`usb_free_urb`::
+
+ void usb_free_urb(struct urb *urb)
+
+You may free an urb that you've submitted, but which hasn't yet been
+returned to you in a completion callback. It will automatically be
+deallocated when it is no longer in use.
+
+
+What has to be filled in?
+=========================
+
+Depending on the type of transaction, there are some inline functions
+defined in ``linux/usb.h`` to simplify the initialization, such as
+:c:func:`usb_fill_control_urb`, :c:func:`usb_fill_bulk_urb` and
+:c:func:`usb_fill_int_urb`. In general, they need the usb device pointer,
+the pipe (usual format from usb.h), the transfer buffer, the desired transfer
+length, the completion handler, and its context. Take a look at the some
+existing drivers to see how they're used.
+
+Flags:
+
+- For ISO there are two startup behaviors: Specified start_frame or ASAP.
+- For ASAP set ``URB_ISO_ASAP`` in transfer_flags.
+
+If short packets should NOT be tolerated, set ``URB_SHORT_NOT_OK`` in
+transfer_flags.
+
+
+How to submit an URB?
+=====================
+
+Just call :c:func:`usb_submit_urb`::
+
+ int usb_submit_urb(struct urb *urb, int mem_flags)
+
+The ``mem_flags`` parameter, such as ``GFP_ATOMIC``, controls memory
+allocation, such as whether the lower levels may block when memory is tight.
+
+It immediately returns, either with status 0 (request queued) or some
+error code, usually caused by the following:
+
+- Out of memory (``-ENOMEM``)
+- Unplugged device (``-ENODEV``)
+- Stalled endpoint (``-EPIPE``)
+- Too many queued ISO transfers (``-EAGAIN``)
+- Too many requested ISO frames (``-EFBIG``)
+- Invalid INT interval (``-EINVAL``)
+- More than one packet for INT (``-EINVAL``)
+
+After submission, ``urb->status`` is ``-EINPROGRESS``; however, you should
+never look at that value except in your completion callback.
+
+For isochronous endpoints, your completion handlers should (re)submit
+URBs to the same endpoint with the ``URB_ISO_ASAP`` flag, using
+multi-buffering, to get seamless ISO streaming.
+
+
+How to cancel an already running URB?
+=====================================
+
+There are two ways to cancel an URB you've submitted but which hasn't
+been returned to your driver yet. For an asynchronous cancel, call
+:c:func:`usb_unlink_urb`::
+
+ int usb_unlink_urb(struct urb *urb)
+
+It removes the urb from the internal list and frees all allocated
+HW descriptors. The status is changed to reflect unlinking. Note
+that the URB will not normally have finished when :c:func:`usb_unlink_urb`
+returns; you must still wait for the completion handler to be called.
+
+To cancel an URB synchronously, call :c:func:`usb_kill_urb`::
+
+ void usb_kill_urb(struct urb *urb)
+
+It does everything :c:func:`usb_unlink_urb` does, and in addition it waits
+until after the URB has been returned and the completion handler
+has finished. It also marks the URB as temporarily unusable, so
+that if the completion handler or anyone else tries to resubmit it
+they will get a ``-EPERM`` error. Thus you can be sure that when
+:c:func:`usb_kill_urb` returns, the URB is totally idle.
+
+There is a lifetime issue to consider. An URB may complete at any
+time, and the completion handler may free the URB. If this happens
+while :c:func:`usb_unlink_urb` or :c:func:`usb_kill_urb` is running, it will
+cause a memory-access violation. The driver is responsible for avoiding this,
+which often means some sort of lock will be needed to prevent the URB
+from being deallocated while it is still in use.
+
+On the other hand, since usb_unlink_urb may end up calling the
+completion handler, the handler must not take any lock that is held
+when usb_unlink_urb is invoked. The general solution to this problem
+is to increment the URB's reference count while holding the lock, then
+drop the lock and call usb_unlink_urb or usb_kill_urb, and then
+decrement the URB's reference count. You increment the reference
+count by calling :c:func`usb_get_urb`::
+
+ struct urb *usb_get_urb(struct urb *urb)
+
+(ignore the return value; it is the same as the argument) and
+decrement the reference count by calling :c:func:`usb_free_urb`. Of course,
+none of this is necessary if there's no danger of the URB being freed
+by the completion handler.
+
+
+What about the completion handler?
+==================================
+
+The handler is of the following type::
+
+ typedef void (*usb_complete_t)(struct urb *)
+
+I.e., it gets the URB that caused the completion call. In the completion
+handler, you should have a look at ``urb->status`` to detect any USB errors.
+Since the context parameter is included in the URB, you can pass
+information to the completion handler.
+
+Note that even when an error (or unlink) is reported, data may have been
+transferred. That's because USB transfers are packetized; it might take
+sixteen packets to transfer your 1KByte buffer, and ten of them might
+have transferred successfully before the completion was called.
+
+
+.. warning::
+
+ NEVER SLEEP IN A COMPLETION HANDLER.
+
+ These are often called in atomic context.
+
+In the current kernel, completion handlers run with local interrupts
+disabled, but in the future this will be changed, so don't assume that
+local IRQs are always disabled inside completion handlers.
+
+How to do isochronous (ISO) transfers?
+======================================
+
+Besides the fields present on a bulk transfer, for ISO, you also
+have to set ``urb->interval`` to say how often to make transfers; it's
+often one per frame (which is once every microframe for highspeed devices).
+The actual interval used will be a power of two that's no bigger than what
+you specify. You can use the :c:func:`usb_fill_int_urb` macro to fill
+most ISO transfer fields.
+
+For ISO transfers you also have to fill a :c:type:`usb_iso_packet_descriptor`
+structure, allocated at the end of the URB by :c:func:`usb_alloc_urb`, for
+each packet you want to schedule.
+
+The :c:func:`usb_submit_urb` call modifies ``urb->interval`` to the implemented
+interval value that is less than or equal to the requested interval value. If
+``URB_ISO_ASAP`` scheduling is used, ``urb->start_frame`` is also updated.
+
+For each entry you have to specify the data offset for this frame (base is
+transfer_buffer), and the length you want to write/expect to read.
+After completion, actual_length contains the actual transferred length and
+status contains the resulting status for the ISO transfer for this frame.
+It is allowed to specify a varying length from frame to frame (e.g. for
+audio synchronisation/adaptive transfer rates). You can also use the length
+0 to omit one or more frames (striping).
+
+For scheduling you can choose your own start frame or ``URB_ISO_ASAP``. As
+explained earlier, if you always keep at least one URB queued and your
+completion keeps (re)submitting a later URB, you'll get smooth ISO streaming
+(if usb bandwidth utilization allows).
+
+If you specify your own start frame, make sure it's several frames in advance
+of the current frame. You might want this model if you're synchronizing
+ISO data with some other event stream.
+
+
+How to start interrupt (INT) transfers?
+=======================================
+
+Interrupt transfers, like isochronous transfers, are periodic, and happen
+in intervals that are powers of two (1, 2, 4 etc) units. Units are frames
+for full and low speed devices, and microframes for high speed ones.
+You can use the :c:func:`usb_fill_int_urb` macro to fill INT transfer fields.
+
+The :c:func:`usb_submit_urb` call modifies ``urb->interval`` to the implemented
+interval value that is less than or equal to the requested interval value.
+
+In Linux 2.6, unlike earlier versions, interrupt URBs are not automagically
+restarted when they complete. They end when the completion handler is
+called, just like other URBs. If you want an interrupt URB to be restarted,
+your completion handler must resubmit it.
+s
diff --git a/Documentation/driver-api/usb/anchors.rst b/Documentation/driver-api/usb/anchors.rst
new file mode 100644
index 0000000000..4b248e691b
--- /dev/null
+++ b/Documentation/driver-api/usb/anchors.rst
@@ -0,0 +1,83 @@
+USB Anchors
+~~~~~~~~~~~
+
+What is anchor?
+===============
+
+A USB driver needs to support some callbacks requiring
+a driver to cease all IO to an interface. To do so, a
+driver has to keep track of the URBs it has submitted
+to know they've all completed or to call usb_kill_urb
+for them. The anchor is a data structure takes care of
+keeping track of URBs and provides methods to deal with
+multiple URBs.
+
+Allocation and Initialisation
+=============================
+
+There's no API to allocate an anchor. It is simply declared
+as struct usb_anchor. :c:func:`init_usb_anchor` must be called to
+initialise the data structure.
+
+Deallocation
+============
+
+Once it has no more URBs associated with it, the anchor can be
+freed with normal memory management operations.
+
+Association and disassociation of URBs with anchors
+===================================================
+
+An association of URBs to an anchor is made by an explicit
+call to :c:func:`usb_anchor_urb`. The association is maintained until
+an URB is finished by (successful) completion. Thus disassociation
+is automatic. A function is provided to forcibly finish (kill)
+all URBs associated with an anchor.
+Furthermore, disassociation can be made with :c:func:`usb_unanchor_urb`
+
+Operations on multitudes of URBs
+================================
+
+:c:func:`usb_kill_anchored_urbs`
+--------------------------------
+
+This function kills all URBs associated with an anchor. The URBs
+are called in the reverse temporal order they were submitted.
+This way no data can be reordered.
+
+:c:func:`usb_unlink_anchored_urbs`
+----------------------------------
+
+
+This function unlinks all URBs associated with an anchor. The URBs
+are processed in the reverse temporal order they were submitted.
+This is similar to :c:func:`usb_kill_anchored_urbs`, but it will not sleep.
+Therefore no guarantee is made that the URBs have been unlinked when
+the call returns. They may be unlinked later but will be unlinked in
+finite time.
+
+:c:func:`usb_scuttle_anchored_urbs`
+-----------------------------------
+
+All URBs of an anchor are unanchored en masse.
+
+:c:func:`usb_wait_anchor_empty_timeout`
+---------------------------------------
+
+This function waits for all URBs associated with an anchor to finish
+or a timeout, whichever comes first. Its return value will tell you
+whether the timeout was reached.
+
+:c:func:`usb_anchor_empty`
+--------------------------
+
+Returns true if no URBs are associated with an anchor. Locking
+is the caller's responsibility.
+
+:c:func:`usb_get_from_anchor`
+-----------------------------
+
+Returns the oldest anchored URB of an anchor. The URB is unanchored
+and returned with a reference. As you may mix URBs to several
+destinations in one anchor you have no guarantee the chronologically
+first submitted URB is returned.
diff --git a/Documentation/driver-api/usb/bulk-streams.rst b/Documentation/driver-api/usb/bulk-streams.rst
new file mode 100644
index 0000000000..eeefe582f8
--- /dev/null
+++ b/Documentation/driver-api/usb/bulk-streams.rst
@@ -0,0 +1,83 @@
+USB bulk streams
+~~~~~~~~~~~~~~~~
+
+Background
+==========
+
+Bulk endpoint streams were added in the USB 3.0 specification. Streams allow a
+device driver to overload a bulk endpoint so that multiple transfers can be
+queued at once.
+
+Streams are defined in sections 4.4.6.4 and 8.12.1.4 of the Universal Serial Bus
+3.0 specification at https://www.usb.org/developers/docs/ The USB Attached SCSI
+Protocol, which uses streams to queue multiple SCSI commands, can be found on
+the T10 website (https://t10.org/).
+
+
+Device-side implications
+========================
+
+Once a buffer has been queued to a stream ring, the device is notified (through
+an out-of-band mechanism on another endpoint) that data is ready for that stream
+ID. The device then tells the host which "stream" it wants to start. The host
+can also initiate a transfer on a stream without the device asking, but the
+device can refuse that transfer. Devices can switch between streams at any
+time.
+
+
+Driver implications
+===================
+
+::
+
+ int usb_alloc_streams(struct usb_interface *interface,
+ struct usb_host_endpoint **eps, unsigned int num_eps,
+ unsigned int num_streams, gfp_t mem_flags);
+
+Device drivers will call this API to request that the host controller driver
+allocate memory so the driver can use up to num_streams stream IDs. They must
+pass an array of usb_host_endpoints that need to be setup with similar stream
+IDs. This is to ensure that a UASP driver will be able to use the same stream
+ID for the bulk IN and OUT endpoints used in a Bi-directional command sequence.
+
+The return value is an error condition (if one of the endpoints doesn't support
+streams, or the xHCI driver ran out of memory), or the number of streams the
+host controller allocated for this endpoint. The xHCI host controller hardware
+declares how many stream IDs it can support, and each bulk endpoint on a
+SuperSpeed device will say how many stream IDs it can handle. Therefore,
+drivers should be able to deal with being allocated less stream IDs than they
+requested.
+
+Do NOT call this function if you have URBs enqueued for any of the endpoints
+passed in as arguments. Do not call this function to request less than two
+streams.
+
+Drivers will only be allowed to call this API once for the same endpoint
+without calling usb_free_streams(). This is a simplification for the xHCI host
+controller driver, and may change in the future.
+
+
+Picking new Stream IDs to use
+=============================
+
+Stream ID 0 is reserved, and should not be used to communicate with devices. If
+usb_alloc_streams() returns with a value of N, you may use streams 1 though N.
+To queue an URB for a specific stream, set the urb->stream_id value. If the
+endpoint does not support streams, an error will be returned.
+
+Note that new API to choose the next stream ID will have to be added if the xHCI
+driver supports secondary stream IDs.
+
+
+Clean up
+========
+
+If a driver wishes to stop using streams to communicate with the device, it
+should call::
+
+ void usb_free_streams(struct usb_interface *interface,
+ struct usb_host_endpoint **eps, unsigned int num_eps,
+ gfp_t mem_flags);
+
+All stream IDs will be deallocated when the driver releases the interface, to
+ensure that drivers that don't support streams will be able to use the endpoint.
diff --git a/Documentation/driver-api/usb/callbacks.rst b/Documentation/driver-api/usb/callbacks.rst
new file mode 100644
index 0000000000..2b80cf54bc
--- /dev/null
+++ b/Documentation/driver-api/usb/callbacks.rst
@@ -0,0 +1,157 @@
+USB core callbacks
+~~~~~~~~~~~~~~~~~~
+
+What callbacks will usbcore do?
+===============================
+
+Usbcore will call into a driver through callbacks defined in the driver
+structure and through the completion handler of URBs a driver submits.
+Only the former are in the scope of this document. These two kinds of
+callbacks are completely independent of each other. Information on the
+completion callback can be found in :ref:`usb-urb`.
+
+The callbacks defined in the driver structure are:
+
+1. Hotplugging callbacks:
+
+ - @probe:
+ Called to see if the driver is willing to manage a particular
+ interface on a device.
+
+ - @disconnect:
+ Called when the interface is no longer accessible, usually
+ because its device has been (or is being) disconnected or the
+ driver module is being unloaded.
+
+2. Odd backdoor through usbfs:
+
+ - @ioctl:
+ Used for drivers that want to talk to userspace through
+ the "usbfs" filesystem. This lets devices provide ways to
+ expose information to user space regardless of where they
+ do (or don't) show up otherwise in the filesystem.
+
+3. Power management (PM) callbacks:
+
+ - @suspend:
+ Called when the device is going to be suspended.
+
+ - @resume:
+ Called when the device is being resumed.
+
+ - @reset_resume:
+ Called when the suspended device has been reset instead
+ of being resumed.
+
+4. Device level operations:
+
+ - @pre_reset:
+ Called when the device is about to be reset.
+
+ - @post_reset:
+ Called after the device has been reset
+
+The ioctl interface (2) should be used only if you have a very good
+reason. Sysfs is preferred these days. The PM callbacks are covered
+separately in :ref:`usb-power-management`.
+
+Calling conventions
+===================
+
+All callbacks are mutually exclusive. There's no need for locking
+against other USB callbacks. All callbacks are called from a task
+context. You may sleep. However, it is important that all sleeps have a
+small fixed upper limit in time. In particular you must not call out to
+user space and await results.
+
+Hotplugging callbacks
+=====================
+
+These callbacks are intended to associate and disassociate a driver with
+an interface. A driver's bond to an interface is exclusive.
+
+The probe() callback
+--------------------
+
+::
+
+ int (*probe) (struct usb_interface *intf,
+ const struct usb_device_id *id);
+
+Accept or decline an interface. If you accept the device return 0,
+otherwise -ENODEV or -ENXIO. Other error codes should be used only if a
+genuine error occurred during initialisation which prevented a driver
+from accepting a device that would else have been accepted.
+You are strongly encouraged to use usbcore's facility,
+usb_set_intfdata(), to associate a data structure with an interface, so
+that you know which internal state and identity you associate with a
+particular interface. The device will not be suspended and you may do IO
+to the interface you are called for and endpoint 0 of the device. Device
+initialisation that doesn't take too long is a good idea here.
+
+The disconnect() callback
+-------------------------
+
+::
+
+ void (*disconnect) (struct usb_interface *intf);
+
+This callback is a signal to break any connection with an interface.
+You are not allowed any IO to a device after returning from this
+callback. You also may not do any other operation that may interfere
+with another driver bound the interface, eg. a power management
+operation.
+If you are called due to a physical disconnection, all your URBs will be
+killed by usbcore. Note that in this case disconnect will be called some
+time after the physical disconnection. Thus your driver must be prepared
+to deal with failing IO even prior to the callback.
+
+Device level callbacks
+======================
+
+pre_reset
+---------
+
+::
+
+ int (*pre_reset)(struct usb_interface *intf);
+
+A driver or user space is triggering a reset on the device which
+contains the interface passed as an argument. Cease IO, wait for all
+outstanding URBs to complete, and save any device state you need to
+restore. No more URBs may be submitted until the post_reset method
+is called.
+
+If you need to allocate memory here, use GFP_NOIO or GFP_ATOMIC, if you
+are in atomic context.
+
+post_reset
+----------
+
+::
+
+ int (*post_reset)(struct usb_interface *intf);
+
+The reset has completed. Restore any saved device state and begin
+using the device again.
+
+If you need to allocate memory here, use GFP_NOIO or GFP_ATOMIC, if you
+are in atomic context.
+
+Call sequences
+==============
+
+No callbacks other than probe will be invoked for an interface
+that isn't bound to your driver.
+
+Probe will never be called for an interface bound to a driver.
+Hence following a successful probe, disconnect will be called
+before there is another probe for the same interface.
+
+Once your driver is bound to an interface, disconnect can be
+called at any time except in between pre_reset and post_reset.
+pre_reset is always followed by post_reset, even if the reset
+failed or the device has been unplugged.
+
+suspend is always followed by one of: resume, reset_resume, or
+disconnect.
diff --git a/Documentation/driver-api/usb/dma.rst b/Documentation/driver-api/usb/dma.rst
new file mode 100644
index 0000000000..d32c27e11b
--- /dev/null
+++ b/Documentation/driver-api/usb/dma.rst
@@ -0,0 +1,136 @@
+USB DMA
+~~~~~~~
+
+In Linux 2.5 kernels (and later), USB device drivers have additional control
+over how DMA may be used to perform I/O operations. The APIs are detailed
+in the kernel usb programming guide (kerneldoc, from the source code).
+
+API overview
+============
+
+The big picture is that USB drivers can continue to ignore most DMA issues,
+though they still must provide DMA-ready buffers (see
+Documentation/core-api/dma-api-howto.rst). That's how they've worked through
+the 2.4 (and earlier) kernels, or they can now be DMA-aware.
+
+DMA-aware usb drivers:
+
+- New calls enable DMA-aware drivers, letting them allocate dma buffers and
+ manage dma mappings for existing dma-ready buffers (see below).
+
+- URBs have an additional "transfer_dma" field, as well as a transfer_flags
+ bit saying if it's valid. (Control requests also have "setup_dma", but
+ drivers must not use it.)
+
+- "usbcore" will map this DMA address, if a DMA-aware driver didn't do
+ it first and set ``URB_NO_TRANSFER_DMA_MAP``. HCDs
+ don't manage dma mappings for URBs.
+
+- There's a new "generic DMA API", parts of which are usable by USB device
+ drivers. Never use dma_set_mask() on any USB interface or device; that
+ would potentially break all devices sharing that bus.
+
+Eliminating copies
+==================
+
+It's good to avoid making CPUs copy data needlessly. The costs can add up,
+and effects like cache-trashing can impose subtle penalties.
+
+- If you're doing lots of small data transfers from the same buffer all
+ the time, that can really burn up resources on systems which use an
+ IOMMU to manage the DMA mappings. It can cost MUCH more to set up and
+ tear down the IOMMU mappings with each request than perform the I/O!
+
+ For those specific cases, USB has primitives to allocate less expensive
+ memory. They work like kmalloc and kfree versions that give you the right
+ kind of addresses to store in urb->transfer_buffer and urb->transfer_dma.
+ You'd also set ``URB_NO_TRANSFER_DMA_MAP`` in urb->transfer_flags::
+
+ void *usb_alloc_coherent (struct usb_device *dev, size_t size,
+ int mem_flags, dma_addr_t *dma);
+
+ void usb_free_coherent (struct usb_device *dev, size_t size,
+ void *addr, dma_addr_t dma);
+
+ Most drivers should **NOT** be using these primitives; they don't need
+ to use this type of memory ("dma-coherent"), and memory returned from
+ :c:func:`kmalloc` will work just fine.
+
+ The memory buffer returned is "dma-coherent"; sometimes you might need to
+ force a consistent memory access ordering by using memory barriers. It's
+ not using a streaming DMA mapping, so it's good for small transfers on
+ systems where the I/O would otherwise thrash an IOMMU mapping. (See
+ Documentation/core-api/dma-api-howto.rst for definitions of "coherent" and
+ "streaming" DMA mappings.)
+
+ Asking for 1/Nth of a page (as well as asking for N pages) is reasonably
+ space-efficient.
+
+ On most systems the memory returned will be uncached, because the
+ semantics of dma-coherent memory require either bypassing CPU caches
+ or using cache hardware with bus-snooping support. While x86 hardware
+ has such bus-snooping, many other systems use software to flush cache
+ lines to prevent DMA conflicts.
+
+- Devices on some EHCI controllers could handle DMA to/from high memory.
+
+ Unfortunately, the current Linux DMA infrastructure doesn't have a sane
+ way to expose these capabilities ... and in any case, HIGHMEM is mostly a
+ design wart specific to x86_32. So your best bet is to ensure you never
+ pass a highmem buffer into a USB driver. That's easy; it's the default
+ behavior. Just don't override it; e.g. with ``NETIF_F_HIGHDMA``.
+
+ This may force your callers to do some bounce buffering, copying from
+ high memory to "normal" DMA memory. If you can come up with a good way
+ to fix this issue (for x86_32 machines with over 1 GByte of memory),
+ feel free to submit patches.
+
+Working with existing buffers
+=============================
+
+Existing buffers aren't usable for DMA without first being mapped into the
+DMA address space of the device. However, most buffers passed to your
+driver can safely be used with such DMA mapping. (See the first section
+of Documentation/core-api/dma-api-howto.rst, titled "What memory is DMA-able?")
+
+- When you're using scatterlists, you can map everything at once. On some
+ systems, this kicks in an IOMMU and turns the scatterlists into single
+ DMA transactions::
+
+ int usb_buffer_map_sg (struct usb_device *dev, unsigned pipe,
+ struct scatterlist *sg, int nents);
+
+ void usb_buffer_dmasync_sg (struct usb_device *dev, unsigned pipe,
+ struct scatterlist *sg, int n_hw_ents);
+
+ void usb_buffer_unmap_sg (struct usb_device *dev, unsigned pipe,
+ struct scatterlist *sg, int n_hw_ents);
+
+ It's probably easier to use the new ``usb_sg_*()`` calls, which do the DMA
+ mapping and apply other tweaks to make scatterlist i/o be fast.
+
+- Some drivers may prefer to work with the model that they're mapping large
+ buffers, synchronizing their safe re-use. (If there's no re-use, then let
+ usbcore do the map/unmap.) Large periodic transfers make good examples
+ here, since it's cheaper to just synchronize the buffer than to unmap it
+ each time an urb completes and then re-map it on during resubmission.
+
+ These calls all work with initialized urbs: ``urb->dev``, ``urb->pipe``,
+ ``urb->transfer_buffer``, and ``urb->transfer_buffer_length`` must all be
+ valid when these calls are used (``urb->setup_packet`` must be valid too
+ if urb is a control request)::
+
+ struct urb *usb_buffer_map (struct urb *urb);
+
+ void usb_buffer_dmasync (struct urb *urb);
+
+ void usb_buffer_unmap (struct urb *urb);
+
+ The calls manage ``urb->transfer_dma`` for you, and set
+ ``URB_NO_TRANSFER_DMA_MAP`` so that usbcore won't map or unmap the buffer.
+ They cannot be used for setup_packet buffers in control requests.
+
+Note that several of those interfaces are currently commented out, since
+they don't have current users. See the source code. Other than the dmasync
+calls (where the underlying DMA primitives have changed), most of them can
+easily be commented back in if you want to use them.
diff --git a/Documentation/driver-api/usb/dwc3.rst b/Documentation/driver-api/usb/dwc3.rst
new file mode 100644
index 0000000000..e3d6a62099
--- /dev/null
+++ b/Documentation/driver-api/usb/dwc3.rst
@@ -0,0 +1,711 @@
+===============================================================
+Synopsys DesignWare Core SuperSpeed USB 3.0 Controller
+===============================================================
+
+:Author: Felipe Balbi <felipe.balbi@linux.intel.com>
+:Date: April 2017
+
+Introduction
+============
+
+The *Synopsys DesignWare Core SuperSpeed USB 3.0 Controller*
+(hereinafter referred to as *DWC3*) is a USB SuperSpeed compliant
+controller which can be configured in one of 4 ways:
+
+ 1. Peripheral-only configuration
+ 2. Host-only configuration
+ 3. Dual-Role configuration
+ 4. Hub configuration
+
+Linux currently supports several versions of this controller. In all
+likelihood, the version in your SoC is already supported. At the time
+of this writing, known tested versions range from 2.02a to 3.10a. As a
+rule of thumb, anything above 2.02a should work reliably well.
+
+Currently, we have many known users for this driver. In alphabetical
+order:
+
+ 1. Cavium
+ 2. Intel Corporation
+ 3. Qualcomm
+ 4. Rockchip
+ 5. ST
+ 6. Samsung
+ 7. Texas Instruments
+ 8. Xilinx
+
+Summary of Features
+======================
+
+For details about features supported by your version of DWC3, consult
+your IP team and/or *Synopsys DesignWare Core SuperSpeed USB 3.0
+Controller Databook*. Following is a list of features supported by the
+driver at the time of this writing:
+
+ 1. Up to 16 bidirectional endpoints (including the control
+ pipe - ep0)
+ 2. Flexible endpoint configuration
+ 3. Simultaneous IN and OUT transfer support
+ 4. Scatter-list support
+ 5. Up to 256 TRBs [#trb]_ per endpoint
+ 6. Support for all transfer types (*Control*, *Bulk*,
+ *Interrupt*, and *Isochronous*)
+ 7. SuperSpeed Bulk Streams
+ 8. Link Power Management
+ 9. Trace Events for debugging
+ 10. DebugFS [#debugfs]_ interface
+
+These features have all been exercised with many of the **in-tree**
+gadget drivers. We have verified both *ConfigFS* [#configfs]_ and
+legacy gadget drivers.
+
+Driver Design
+==============
+
+The DWC3 driver sits on the *drivers/usb/dwc3/* directory. All files
+related to this driver are in this one directory. This makes it easy
+for new-comers to read the code and understand how it behaves.
+
+Because of DWC3's configuration flexibility, the driver is a little
+complex in some places but it should be rather straightforward to
+understand.
+
+The biggest part of the driver refers to the Gadget API.
+
+Known Limitations
+===================
+
+Like any other HW, DWC3 has its own set of limitations. To avoid
+constant questions about such problems, we decided to document them
+here and have a single location to where we could point users.
+
+OUT Transfer Size Requirements
+---------------------------------
+
+According to Synopsys Databook, all OUT transfer TRBs [#trb]_ must
+have their *size* field set to a value which is integer divisible by
+the endpoint's *wMaxPacketSize*. This means that *e.g.* in order to
+receive a Mass Storage *CBW* [#cbw]_, req->length must either be set
+to a value that's divisible by *wMaxPacketSize* (1024 on SuperSpeed,
+512 on HighSpeed, etc), or DWC3 driver must add a Chained TRB pointing
+to a throw-away buffer for the remaining length. Without this, OUT
+transfers will **NOT** start.
+
+Note that as of this writing, this won't be a problem because DWC3 is
+fully capable of appending a chained TRB for the remaining length and
+completely hide this detail from the gadget driver. It's still worth
+mentioning because this seems to be the largest source of queries
+about DWC3 and *non-working transfers*.
+
+TRB Ring Size Limitation
+-------------------------
+
+We, currently, have a hard limit of 256 TRBs [#trb]_ per endpoint,
+with the last TRB being a Link TRB [#link_trb]_ pointing back to the
+first. This limit is arbitrary but it has the benefit of adding up to
+exactly 4096 bytes, or 1 Page.
+
+DWC3 driver will try its best to cope with more than 255 requests and,
+for the most part, it should work normally. However this is not
+something that has been exercised very frequently. If you experience
+any problems, see section **Reporting Bugs** below.
+
+Reporting Bugs
+================
+
+Whenever you encounter a problem with DWC3, first and foremost you
+should make sure that:
+
+ 1. You're running latest tag from `Linus' tree`_
+ 2. You can reproduce the error without any out-of-tree changes
+ to DWC3
+ 3. You have checked that it's not a fault on the host machine
+
+After all these are verified, then here's how to capture enough
+information so we can be of any help to you.
+
+Required Information
+---------------------
+
+DWC3 relies exclusively on Trace Events for debugging. Everything is
+exposed there, with some extra bits being exposed to DebugFS
+[#debugfs]_.
+
+In order to capture DWC3's Trace Events you should run the following
+commands **before** plugging the USB cable to a host machine:
+
+.. code-block:: sh
+
+ # mkdir -p /d
+ # mkdir -p /t
+ # mount -t debugfs none /d
+ # mount -t tracefs none /t
+ # echo 81920 > /t/buffer_size_kb
+ # echo 1 > /t/events/dwc3/enable
+
+After this is done, you can connect your USB cable and reproduce the
+problem. As soon as the fault is reproduced, make a copy of files
+``trace`` and ``regdump``, like so:
+
+.. code-block:: sh
+
+ # cp /t/trace /root/trace.txt
+ # cat /d/*dwc3*/regdump > /root/regdump.txt
+
+Make sure to compress ``trace.txt`` and ``regdump.txt`` in a tarball
+and email it to `me`_ with `linux-usb`_ in Cc. If you want to be extra
+sure that I'll help you, write your subject line in the following
+format:
+
+ **[BUG REPORT] usb: dwc3: Bug while doing XYZ**
+
+On the email body, make sure to detail what you doing, which gadget
+driver you were using, how to reproduce the problem, what SoC you're
+using, which OS (and its version) was running on the Host machine.
+
+With all this information, we should be able to understand what's
+going on and be helpful to you.
+
+Debugging
+===========
+
+First and foremost a disclaimer::
+
+ DISCLAIMER: The information available on DebugFS and/or TraceFS can
+ change at any time at any Major Linux Kernel Release. If writing
+ scripts, do **NOT** assume information to be available in the
+ current format.
+
+With that out of the way, let's carry on.
+
+If you're willing to debug your own problem, you deserve a round of
+applause :-)
+
+Anyway, there isn't much to say here other than Trace Events will be
+really helpful in figuring out issues with DWC3. Also, access to
+Synopsys Databook will be **really** valuable in this case.
+
+A USB Sniffer can be helpful at times but it's not entirely required,
+there's a lot that can be understood without looking at the wire.
+
+Feel free to email `me`_ and Cc `linux-usb`_ if you need any help.
+
+``DebugFS``
+-------------
+
+``DebugFS`` is very good for gathering snapshots of what's going on
+with DWC3 and/or any endpoint.
+
+On DWC3's ``DebugFS`` directory, you will find the following files and
+directories:
+
+``ep[0..15]{in,out}/``
+``link_state``
+``regdump``
+``testmode``
+
+``link_state``
+``````````````
+
+When read, ``link_state`` will print out one of ``U0``, ``U1``,
+``U2``, ``U3``, ``SS.Disabled``, ``RX.Detect``, ``SS.Inactive``,
+``Polling``, ``Recovery``, ``Hot Reset``, ``Compliance``,
+``Loopback``, ``Reset``, ``Resume`` or ``UNKNOWN link state``.
+
+This file can also be written to in order to force link to one of the
+states above.
+
+``regdump``
+`````````````
+
+File name is self-explanatory. When read, ``regdump`` will print out a
+register dump of DWC3. Note that this file can be grepped to find the
+information you want.
+
+``testmode``
+``````````````
+
+When read, ``testmode`` will print out a name of one of the specified
+USB 2.0 Testmodes (``test_j``, ``test_k``, ``test_se0_nak``,
+``test_packet``, ``test_force_enable``) or the string ``no test`` in
+case no tests are currently being executed.
+
+In order to start any of these test modes, the same strings can be
+written to the file and DWC3 will enter the requested test mode.
+
+
+``ep[0..15]{in,out}``
+``````````````````````
+
+For each endpoint we expose one directory following the naming
+convention ``ep$num$dir`` *(ep0in, ep0out, ep1in, ...)*. Inside each
+of these directories you will find the following files:
+
+``descriptor_fetch_queue``
+``event_queue``
+``rx_fifo_queue``
+``rx_info_queue``
+``rx_request_queue``
+``transfer_type``
+``trb_ring``
+``tx_fifo_queue``
+``tx_request_queue``
+
+With access to Synopsys Databook, you can decode the information on
+them.
+
+``transfer_type``
+~~~~~~~~~~~~~~~~~~
+
+When read, ``transfer_type`` will print out one of ``control``,
+``bulk``, ``interrupt`` or ``isochronous`` depending on what the
+endpoint descriptor says. If the endpoint hasn't been enabled yet, it
+will print ``--``.
+
+``trb_ring``
+~~~~~~~~~~~~~
+
+When read, ``trb_ring`` will print out details about all TRBs on the
+ring. It will also tell you where our enqueue and dequeue pointers are
+located in the ring:
+
+.. code-block:: sh
+
+ buffer_addr,size,type,ioc,isp_imi,csp,chn,lst,hwo
+ 000000002c754000,481,normal,1,0,1,0,0,0
+ 000000002c75c000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c78c000,481,normal,1,0,1,0,0,0
+ 000000002c754000,481,normal,1,0,1,0,0,0
+ 000000002c75c000,481,normal,1,0,1,0,0,0
+ 000000002c784000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c78c000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c784000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c78c000,481,normal,1,0,1,0,0,0
+ 000000002c754000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c784000,481,normal,1,0,1,0,0,0
+ 000000002c78c000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c78c000,481,normal,1,0,1,0,0,0
+ 000000002c784000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c78c000,481,normal,1,0,1,0,0,0
+ 000000002c754000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c78c000,481,normal,1,0,1,0,0,0
+ 000000002c75c000,481,normal,1,0,1,0,0,0
+ 000000002c78c000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c754000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c754000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c78c000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c754000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c75c000,481,normal,1,0,1,0,0,0
+ 000000002c780000,481,normal,1,0,1,0,0,0
+ 000000002c784000,481,normal,1,0,1,0,0,0
+ 000000002c788000,481,normal,1,0,1,0,0,0
+ 000000002c78c000,481,normal,1,0,1,0,0,0
+ 000000002c790000,481,normal,1,0,1,0,0,0
+ 000000002c754000,481,normal,1,0,1,0,0,0
+ 000000002c758000,481,normal,1,0,1,0,0,0
+ 000000002c75c000,512,normal,1,0,1,0,0,1 D
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0 E
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 0000000000000000,0,UNKNOWN,0,0,0,0,0,0
+ 00000000381ab000,0,link,0,0,0,0,0,1
+
+
+Trace Events
+-------------
+
+DWC3 also provides several trace events which help us gathering
+information about the behavior of the driver during runtime.
+
+In order to use these events, you must enable ``CONFIG_FTRACE`` in
+your kernel config.
+
+For details about how enable DWC3 events, see section **Reporting
+Bugs**.
+
+The following subsections will give details about each Event Class and
+each Event defined by DWC3.
+
+MMIO
+```````
+
+It is sometimes useful to look at every MMIO access when looking for
+bugs. Because of that, DWC3 offers two Trace Events (one for
+dwc3_readl() and one for dwc3_writel()). ``TP_printk`` follows::
+
+ TP_printk("addr %p value %08x", __entry->base + __entry->offset,
+ __entry->value)
+
+Interrupt Events
+````````````````
+
+Every IRQ event can be logged and decoded into a human readable
+string. Because every event will be different, we don't give an
+example other than the ``TP_printk`` format used::
+
+ TP_printk("event (%08x): %s", __entry->event,
+ dwc3_decode_event(__entry->event, __entry->ep0state))
+
+Control Request
+`````````````````
+
+Every USB Control Request can be logged to the trace buffer. The
+output format is::
+
+ TP_printk("%s", dwc3_decode_ctrl(__entry->bRequestType,
+ __entry->bRequest, __entry->wValue,
+ __entry->wIndex, __entry->wLength)
+ )
+
+Note that Standard Control Requests will be decoded into
+human-readable strings with their respective arguments. Class and
+Vendor requests will be printed out a sequence of 8 bytes in hex
+format.
+
+Lifetime of a ``struct usb_request``
+```````````````````````````````````````
+
+The entire lifetime of a ``struct usb_request`` can be tracked on the
+trace buffer. We have one event for each of allocation, free,
+queueing, dequeueing, and giveback. Output format is::
+
+ TP_printk("%s: req %p length %u/%u %s%s%s ==> %d",
+ __get_str(name), __entry->req, __entry->actual, __entry->length,
+ __entry->zero ? "Z" : "z",
+ __entry->short_not_ok ? "S" : "s",
+ __entry->no_interrupt ? "i" : "I",
+ __entry->status
+ )
+
+Generic Commands
+````````````````````
+
+We can log and decode every Generic Command with its completion
+code. Format is::
+
+ TP_printk("cmd '%s' [%x] param %08x --> status: %s",
+ dwc3_gadget_generic_cmd_string(__entry->cmd),
+ __entry->cmd, __entry->param,
+ dwc3_gadget_generic_cmd_status_string(__entry->status)
+ )
+
+Endpoint Commands
+````````````````````
+
+Endpoints commands can also be logged together with completion
+code. Format is::
+
+ TP_printk("%s: cmd '%s' [%d] params %08x %08x %08x --> status: %s",
+ __get_str(name), dwc3_gadget_ep_cmd_string(__entry->cmd),
+ __entry->cmd, __entry->param0,
+ __entry->param1, __entry->param2,
+ dwc3_ep_cmd_status_string(__entry->cmd_status)
+ )
+
+Lifetime of a ``TRB``
+``````````````````````
+
+A ``TRB`` Lifetime is simple. We are either preparing a ``TRB`` or
+completing it. With these two events, we can see how a ``TRB`` changes
+over time. Format is::
+
+ TP_printk("%s: %d/%d trb %p buf %08x%08x size %s%d ctrl %08x (%c%c%c%c:%c%c:%s)",
+ __get_str(name), __entry->queued, __entry->allocated,
+ __entry->trb, __entry->bph, __entry->bpl,
+ ({char *s;
+ int pcm = ((__entry->size >> 24) & 3) + 1;
+ switch (__entry->type) {
+ case USB_ENDPOINT_XFER_INT:
+ case USB_ENDPOINT_XFER_ISOC:
+ switch (pcm) {
+ case 1:
+ s = "1x ";
+ break;
+ case 2:
+ s = "2x ";
+ break;
+ case 3:
+ s = "3x ";
+ break;
+ }
+ default:
+ s = "";
+ } s; }),
+ DWC3_TRB_SIZE_LENGTH(__entry->size), __entry->ctrl,
+ __entry->ctrl & DWC3_TRB_CTRL_HWO ? 'H' : 'h',
+ __entry->ctrl & DWC3_TRB_CTRL_LST ? 'L' : 'l',
+ __entry->ctrl & DWC3_TRB_CTRL_CHN ? 'C' : 'c',
+ __entry->ctrl & DWC3_TRB_CTRL_CSP ? 'S' : 's',
+ __entry->ctrl & DWC3_TRB_CTRL_ISP_IMI ? 'S' : 's',
+ __entry->ctrl & DWC3_TRB_CTRL_IOC ? 'C' : 'c',
+ dwc3_trb_type_string(DWC3_TRBCTL_TYPE(__entry->ctrl))
+ )
+
+Lifetime of an Endpoint
+```````````````````````
+
+And endpoint's lifetime is summarized with enable and disable
+operations, both of which can be traced. Format is::
+
+ TP_printk("%s: mps %d/%d streams %d burst %d ring %d/%d flags %c:%c%c%c%c%c:%c:%c",
+ __get_str(name), __entry->maxpacket,
+ __entry->maxpacket_limit, __entry->max_streams,
+ __entry->maxburst, __entry->trb_enqueue,
+ __entry->trb_dequeue,
+ __entry->flags & DWC3_EP_ENABLED ? 'E' : 'e',
+ __entry->flags & DWC3_EP_STALL ? 'S' : 's',
+ __entry->flags & DWC3_EP_WEDGE ? 'W' : 'w',
+ __entry->flags & DWC3_EP_TRANSFER_STARTED ? 'B' : 'b',
+ __entry->flags & DWC3_EP_PENDING_REQUEST ? 'P' : 'p',
+ __entry->flags & DWC3_EP_END_TRANSFER_PENDING ? 'E' : 'e',
+ __entry->direction ? '<' : '>'
+ )
+
+
+Structures, Methods and Definitions
+====================================
+
+.. kernel-doc:: drivers/usb/dwc3/core.h
+ :doc: main data structures
+ :internal:
+
+.. kernel-doc:: drivers/usb/dwc3/gadget.h
+ :doc: gadget-only helpers
+ :internal:
+
+.. kernel-doc:: drivers/usb/dwc3/gadget.c
+ :doc: gadget-side implementation
+ :internal:
+
+.. kernel-doc:: drivers/usb/dwc3/core.c
+ :doc: core driver (probe, PM, etc)
+ :internal:
+
+.. [#trb] Transfer Request Block
+.. [#link_trb] Transfer Request Block pointing to another Transfer
+ Request Block.
+.. [#debugfs] The Debug File System
+.. [#configfs] The Config File System
+.. [#cbw] Command Block Wrapper
+.. _Linus' tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
+.. _me: felipe.balbi@linux.intel.com
+.. _linux-usb: linux-usb@vger.kernel.org
diff --git a/Documentation/driver-api/usb/error-codes.rst b/Documentation/driver-api/usb/error-codes.rst
new file mode 100644
index 0000000000..8f9790c2d6
--- /dev/null
+++ b/Documentation/driver-api/usb/error-codes.rst
@@ -0,0 +1,210 @@
+.. _usb-error-codes:
+
+USB Error codes
+~~~~~~~~~~~~~~~
+
+:Revised: 2004-Oct-21
+
+This is the documentation of (hopefully) all possible error codes (and
+their interpretation) that can be returned from usbcore.
+
+Some of them are returned by the Host Controller Drivers (HCDs), which
+device drivers only see through usbcore. As a rule, all the HCDs should
+behave the same except for transfer speed dependent behaviors and the
+way certain faults are reported.
+
+
+Error codes returned by :c:func:`usb_submit_urb`
+================================================
+
+Non-USB-specific:
+
+
+=============== ===============================================
+0 URB submission went fine
+
+``-ENOMEM`` no memory for allocation of internal structures
+=============== ===============================================
+
+USB-specific:
+
+======================= =======================================================
+``-EBUSY`` The URB is already active.
+
+``-ENODEV`` specified USB-device or bus doesn't exist
+
+``-ENOENT`` specified interface or endpoint does not exist or
+ is not enabled
+
+``-ENXIO`` host controller driver does not support queuing of
+ this type of urb. (treat as a host controller bug.)
+
+``-EINVAL`` a) Invalid transfer type specified (or not supported)
+ b) Invalid or unsupported periodic transfer interval
+ c) ISO: attempted to change transfer interval
+ d) ISO: ``number_of_packets`` is < 0
+ e) various other cases
+
+``-EXDEV`` ISO: ``URB_ISO_ASAP`` wasn't specified and all the
+ frames the URB would be scheduled in have already
+ expired.
+
+``-EFBIG`` Host controller driver can't schedule that many ISO
+ frames.
+
+``-EPIPE`` The pipe type specified in the URB doesn't match the
+ endpoint's actual type.
+
+``-EMSGSIZE`` (a) endpoint maxpacket size is zero; it is not usable
+ in the current interface altsetting.
+ (b) ISO packet is larger than the endpoint maxpacket.
+ (c) requested data transfer length is invalid: negative
+ or too large for the host controller.
+
+``-EBADR`` The wLength value in a control URB's setup packet does
+ not match the URB's transfer_buffer_length.
+
+``-ENOSPC`` This request would overcommit the usb bandwidth reserved
+ for periodic transfers (interrupt, isochronous).
+
+``-ESHUTDOWN`` The device or host controller has been disabled due to
+ some problem that could not be worked around.
+
+``-EPERM`` Submission failed because ``urb->reject`` was set.
+
+``-EHOSTUNREACH`` URB was rejected because the device is suspended.
+
+``-ENOEXEC`` A control URB doesn't contain a Setup packet.
+======================= =======================================================
+
+Error codes returned by ``in urb->status`` or in ``iso_frame_desc[n].status`` (for ISO)
+=======================================================================================
+
+USB device drivers may only test urb status values in completion handlers.
+This is because otherwise there would be a race between HCDs updating
+these values on one CPU, and device drivers testing them on another CPU.
+
+A transfer's actual_length may be positive even when an error has been
+reported. That's because transfers often involve several packets, so that
+one or more packets could finish before an error stops further endpoint I/O.
+
+For isochronous URBs, the urb status value is non-zero only if the URB is
+unlinked, the device is removed, the host controller is disabled, or the total
+transferred length is less than the requested length and the
+``URB_SHORT_NOT_OK`` flag is set. Completion handlers for isochronous URBs
+should only see ``urb->status`` set to zero, ``-ENOENT``, ``-ECONNRESET``,
+``-ESHUTDOWN``, or ``-EREMOTEIO``. Individual frame descriptor status fields
+may report more status codes.
+
+
+=============================== ===============================================
+0 Transfer completed successfully
+
+``-ENOENT`` URB was synchronously unlinked by
+ :c:func:`usb_unlink_urb`
+
+``-EINPROGRESS`` URB still pending, no results yet
+ (That is, if drivers see this it's a bug.)
+
+``-EPROTO`` [#f1]_, [#f2]_ a) bitstuff error
+ b) no response packet received within the
+ prescribed bus turn-around time
+ c) unknown USB error
+
+``-EILSEQ`` [#f1]_, [#f2]_ a) CRC mismatch
+ b) no response packet received within the
+ prescribed bus turn-around time
+ c) unknown USB error
+
+ Note that often the controller hardware does
+ not distinguish among cases a), b), and c), so
+ a driver cannot tell whether there was a
+ protocol error, a failure to respond (often
+ caused by device disconnect), or some other
+ fault.
+
+``-ETIME`` [#f2]_ No response packet received within the
+ prescribed bus turn-around time. This error
+ may instead be reported as
+ ``-EPROTO`` or ``-EILSEQ``.
+
+``-ETIMEDOUT`` Synchronous USB message functions use this code
+ to indicate timeout expired before the transfer
+ completed, and no other error was reported
+ by HC.
+
+``-EPIPE`` [#f2]_ Endpoint stalled. For non-control endpoints,
+ reset this status with
+ :c:func:`usb_clear_halt`.
+
+``-ECOMM`` During an IN transfer, the host controller
+ received data from an endpoint faster than it
+ could be written to system memory
+
+``-ENOSR`` During an OUT transfer, the host controller
+ could not retrieve data from system memory fast
+ enough to keep up with the USB data rate
+
+``-EOVERFLOW`` [#f1]_ The amount of data returned by the endpoint was
+ greater than either the max packet size of the
+ endpoint or the remaining buffer size.
+ "Babble".
+
+``-EREMOTEIO`` The data read from the endpoint did not fill
+ the specified buffer, and ``URB_SHORT_NOT_OK``
+ was set in ``urb->transfer_flags``.
+
+``-ENODEV`` Device was removed. Often preceded by a burst
+ of other errors, since the hub driver doesn't
+ detect device removal events immediately.
+
+``-EXDEV`` ISO transfer only partially completed
+ (only set in ``iso_frame_desc[n].status``,
+ not ``urb->status``)
+
+``-EINVAL`` ISO madness, if this happens: Log off and
+ go home
+
+``-ECONNRESET`` URB was asynchronously unlinked by
+ :c:func:`usb_unlink_urb`
+
+``-ESHUTDOWN`` The device or host controller has been
+ disabled due to some problem that could not
+ be worked around, such as a physical
+ disconnect.
+=============================== ===============================================
+
+
+.. [#f1]
+
+ Error codes like ``-EPROTO``, ``-EILSEQ`` and ``-EOVERFLOW`` normally
+ indicate hardware problems such as bad devices (including firmware)
+ or cables.
+
+.. [#f2]
+
+ This is also one of several codes that different kinds of host
+ controller use to indicate a transfer has failed because of device
+ disconnect. In the interval before the hub driver starts disconnect
+ processing, devices may receive such fault reports for every request.
+
+
+
+Error codes returned by usbcore-functions
+=========================================
+
+.. note:: expect also other submit and transfer status codes
+
+:c:func:`usb_register`:
+
+======================= ===================================
+``-EINVAL`` error during registering new driver
+======================= ===================================
+
+``usb_get_*/usb_set_*()``,
+:c:func:`usb_control_msg`,
+:c:func:`usb_bulk_msg()`:
+
+======================= ==============================================
+``-ETIMEDOUT`` Timeout expired before the transfer completed.
+======================= ==============================================
diff --git a/Documentation/driver-api/usb/gadget.rst b/Documentation/driver-api/usb/gadget.rst
new file mode 100644
index 0000000000..09396edd61
--- /dev/null
+++ b/Documentation/driver-api/usb/gadget.rst
@@ -0,0 +1,510 @@
+========================
+USB Gadget API for Linux
+========================
+
+:Author: David Brownell
+:Date: 20 August 2004
+
+Introduction
+============
+
+This document presents a Linux-USB "Gadget" kernel mode API, for use
+within peripherals and other USB devices that embed Linux. It provides
+an overview of the API structure, and shows how that fits into a system
+development project. This is the first such API released on Linux to
+address a number of important problems, including:
+
+- Supports USB 2.0, for high speed devices which can stream data at
+ several dozen megabytes per second.
+
+- Handles devices with dozens of endpoints just as well as ones with
+ just two fixed-function ones. Gadget drivers can be written so
+ they're easy to port to new hardware.
+
+- Flexible enough to expose more complex USB device capabilities such
+ as multiple configurations, multiple interfaces, composite devices,
+ and alternate interface settings.
+
+- USB "On-The-Go" (OTG) support, in conjunction with updates to the
+ Linux-USB host side.
+
+- Sharing data structures and API models with the Linux-USB host side
+ API. This helps the OTG support, and looks forward to more-symmetric
+ frameworks (where the same I/O model is used by both host and device
+ side drivers).
+
+- Minimalist, so it's easier to support new device controller hardware.
+ I/O processing doesn't imply large demands for memory or CPU
+ resources.
+
+Most Linux developers will not be able to use this API, since they have
+USB ``host`` hardware in a PC, workstation, or server. Linux users with
+embedded systems are more likely to have USB peripheral hardware. To
+distinguish drivers running inside such hardware from the more familiar
+Linux "USB device drivers", which are host side proxies for the real USB
+devices, a different term is used: the drivers inside the peripherals
+are "USB gadget drivers". In USB protocol interactions, the device
+driver is the master (or "client driver") and the gadget driver is the
+slave (or "function driver").
+
+The gadget API resembles the host side Linux-USB API in that both use
+queues of request objects to package I/O buffers, and those requests may
+be submitted or canceled. They share common definitions for the standard
+USB *Chapter 9* messages, structures, and constants. Also, both APIs
+bind and unbind drivers to devices. The APIs differ in detail, since the
+host side's current URB framework exposes a number of implementation
+details and assumptions that are inappropriate for a gadget API. While
+the model for control transfers and configuration management is
+necessarily different (one side is a hardware-neutral master, the other
+is a hardware-aware slave), the endpoint I/0 API used here should also
+be usable for an overhead-reduced host side API.
+
+Structure of Gadget Drivers
+===========================
+
+A system running inside a USB peripheral normally has at least three
+layers inside the kernel to handle USB protocol processing, and may have
+additional layers in user space code. The ``gadget`` API is used by the
+middle layer to interact with the lowest level (which directly handles
+hardware).
+
+In Linux, from the bottom up, these layers are:
+
+*USB Controller Driver*
+ This is the lowest software level. It is the only layer that talks
+ to hardware, through registers, fifos, dma, irqs, and the like. The
+ ``<linux/usb/gadget.h>`` API abstracts the peripheral controller
+ endpoint hardware. That hardware is exposed through endpoint
+ objects, which accept streams of IN/OUT buffers, and through
+ callbacks that interact with gadget drivers. Since normal USB
+ devices only have one upstream port, they only have one of these
+ drivers. The controller driver can support any number of different
+ gadget drivers, but only one of them can be used at a time.
+
+ Examples of such controller hardware include the PCI-based NetChip
+ 2280 USB 2.0 high speed controller, the SA-11x0 or PXA-25x UDC
+ (found within many PDAs), and a variety of other products.
+
+*Gadget Driver*
+ The lower boundary of this driver implements hardware-neutral USB
+ functions, using calls to the controller driver. Because such
+ hardware varies widely in capabilities and restrictions, and is used
+ in embedded environments where space is at a premium, the gadget
+ driver is often configured at compile time to work with endpoints
+ supported by one particular controller. Gadget drivers may be
+ portable to several different controllers, using conditional
+ compilation. (Recent kernels substantially simplify the work
+ involved in supporting new hardware, by *autoconfiguring* endpoints
+ automatically for many bulk-oriented drivers.) Gadget driver
+ responsibilities include:
+
+ - handling setup requests (ep0 protocol responses) possibly
+ including class-specific functionality
+
+ - returning configuration and string descriptors
+
+ - (re)setting configurations and interface altsettings, including
+ enabling and configuring endpoints
+
+ - handling life cycle events, such as managing bindings to
+ hardware, USB suspend/resume, remote wakeup, and disconnection
+ from the USB host.
+
+ - managing IN and OUT transfers on all currently enabled endpoints
+
+ Such drivers may be modules of proprietary code, although that
+ approach is discouraged in the Linux community.
+
+*Upper Level*
+ Most gadget drivers have an upper boundary that connects to some
+ Linux driver or framework in Linux. Through that boundary flows the
+ data which the gadget driver produces and/or consumes through
+ protocol transfers over USB. Examples include:
+
+ - user mode code, using generic (gadgetfs) or application specific
+ files in ``/dev``
+
+ - networking subsystem (for network gadgets, like the CDC Ethernet
+ Model gadget driver)
+
+ - data capture drivers, perhaps video4Linux or a scanner driver; or
+ test and measurement hardware.
+
+ - input subsystem (for HID gadgets)
+
+ - sound subsystem (for audio gadgets)
+
+ - file system (for PTP gadgets)
+
+ - block i/o subsystem (for usb-storage gadgets)
+
+ - ... and more
+
+*Additional Layers*
+ Other layers may exist. These could include kernel layers, such as
+ network protocol stacks, as well as user mode applications building
+ on standard POSIX system call APIs such as ``open()``, ``close()``,
+ ``read()`` and ``write()``. On newer systems, POSIX Async I/O calls may
+ be an option. Such user mode code will not necessarily be subject to
+ the GNU General Public License (GPL).
+
+OTG-capable systems will also need to include a standard Linux-USB host
+side stack, with ``usbcore``, one or more *Host Controller Drivers*
+(HCDs), *USB Device Drivers* to support the OTG "Targeted Peripheral
+List", and so forth. There will also be an *OTG Controller Driver*,
+which is visible to gadget and device driver developers only indirectly.
+That helps the host and device side USB controllers implement the two
+new OTG protocols (HNP and SRP). Roles switch (host to peripheral, or
+vice versa) using HNP during USB suspend processing, and SRP can be
+viewed as a more battery-friendly kind of device wakeup protocol.
+
+Over time, reusable utilities are evolving to help make some gadget
+driver tasks simpler. For example, building configuration descriptors
+from vectors of descriptors for the configurations interfaces and
+endpoints is now automated, and many drivers now use autoconfiguration
+to choose hardware endpoints and initialize their descriptors. A
+potential example of particular interest is code implementing standard
+USB-IF protocols for HID, networking, storage, or audio classes. Some
+developers are interested in KDB or KGDB hooks, to let target hardware
+be remotely debugged. Most such USB protocol code doesn't need to be
+hardware-specific, any more than network protocols like X11, HTTP, or
+NFS are. Such gadget-side interface drivers should eventually be
+combined, to implement composite devices.
+
+Kernel Mode Gadget API
+======================
+
+Gadget drivers declare themselves through a struct
+:c:type:`usb_gadget_driver`, which is responsible for most parts of enumeration
+for a struct usb_gadget. The response to a set_configuration usually
+involves enabling one or more of the struct usb_ep objects exposed by
+the gadget, and submitting one or more struct usb_request buffers to
+transfer data. Understand those four data types, and their operations,
+and you will understand how this API works.
+
+.. Note::
+
+ Other than the "Chapter 9" data types, most of the significant data
+ types and functions are described here.
+
+ However, some relevant information is likely omitted from what you
+ are reading. One example of such information is endpoint
+ autoconfiguration. You'll have to read the header file, and use
+ example source code (such as that for "Gadget Zero"), to fully
+ understand the API.
+
+ The part of the API implementing some basic driver capabilities is
+ specific to the version of the Linux kernel that's in use. The 2.6
+ and upper kernel versions include a *driver model* framework that has
+ no analogue on earlier kernels; so those parts of the gadget API are
+ not fully portable. (They are implemented on 2.4 kernels, but in a
+ different way.) The driver model state is another part of this API that is
+ ignored by the kerneldoc tools.
+
+The core API does not expose every possible hardware feature, only the
+most widely available ones. There are significant hardware features,
+such as device-to-device DMA (without temporary storage in a memory
+buffer) that would be added using hardware-specific APIs.
+
+This API allows drivers to use conditional compilation to handle
+endpoint capabilities of different hardware, but doesn't require that.
+Hardware tends to have arbitrary restrictions, relating to transfer
+types, addressing, packet sizes, buffering, and availability. As a rule,
+such differences only matter for "endpoint zero" logic that handles
+device configuration and management. The API supports limited run-time
+detection of capabilities, through naming conventions for endpoints.
+Many drivers will be able to at least partially autoconfigure
+themselves. In particular, driver init sections will often have endpoint
+autoconfiguration logic that scans the hardware's list of endpoints to
+find ones matching the driver requirements (relying on those
+conventions), to eliminate some of the most common reasons for
+conditional compilation.
+
+Like the Linux-USB host side API, this API exposes the "chunky" nature
+of USB messages: I/O requests are in terms of one or more "packets", and
+packet boundaries are visible to drivers. Compared to RS-232 serial
+protocols, USB resembles synchronous protocols like HDLC (N bytes per
+frame, multipoint addressing, host as the primary station and devices as
+secondary stations) more than asynchronous ones (tty style: 8 data bits
+per frame, no parity, one stop bit). So for example the controller
+drivers won't buffer two single byte writes into a single two-byte USB
+IN packet, although gadget drivers may do so when they implement
+protocols where packet boundaries (and "short packets") are not
+significant.
+
+Driver Life Cycle
+-----------------
+
+Gadget drivers make endpoint I/O requests to hardware without needing to
+know many details of the hardware, but driver setup/configuration code
+needs to handle some differences. Use the API like this:
+
+1. Register a driver for the particular device side usb controller
+ hardware, such as the net2280 on PCI (USB 2.0), sa11x0 or pxa25x as
+ found in Linux PDAs, and so on. At this point the device is logically
+ in the USB ch9 initial state (``attached``), drawing no power and not
+ usable (since it does not yet support enumeration). Any host should
+ not see the device, since it's not activated the data line pullup
+ used by the host to detect a device, even if VBUS power is available.
+
+2. Register a gadget driver that implements some higher level device
+ function. That will then bind() to a :c:type:`usb_gadget`, which activates
+ the data line pullup sometime after detecting VBUS.
+
+3. The hardware driver can now start enumerating. The steps it handles
+ are to accept USB ``power`` and ``set_address`` requests. Other steps are
+ handled by the gadget driver. If the gadget driver module is unloaded
+ before the host starts to enumerate, steps before step 7 are skipped.
+
+4. The gadget driver's ``setup()`` call returns usb descriptors, based both
+ on what the bus interface hardware provides and on the functionality
+ being implemented. That can involve alternate settings or
+ configurations, unless the hardware prevents such operation. For OTG
+ devices, each configuration descriptor includes an OTG descriptor.
+
+5. The gadget driver handles the last step of enumeration, when the USB
+ host issues a ``set_configuration`` call. It enables all endpoints used
+ in that configuration, with all interfaces in their default settings.
+ That involves using a list of the hardware's endpoints, enabling each
+ endpoint according to its descriptor. It may also involve using
+ ``usb_gadget_vbus_draw`` to let more power be drawn from VBUS, as
+ allowed by that configuration. For OTG devices, setting a
+ configuration may also involve reporting HNP capabilities through a
+ user interface.
+
+6. Do real work and perform data transfers, possibly involving changes
+ to interface settings or switching to new configurations, until the
+ device is disconnect()ed from the host. Queue any number of transfer
+ requests to each endpoint. It may be suspended and resumed several
+ times before being disconnected. On disconnect, the drivers go back
+ to step 3 (above).
+
+7. When the gadget driver module is being unloaded, the driver unbind()
+ callback is issued. That lets the controller driver be unloaded.
+
+Drivers will normally be arranged so that just loading the gadget driver
+module (or statically linking it into a Linux kernel) allows the
+peripheral device to be enumerated, but some drivers will defer
+enumeration until some higher level component (like a user mode daemon)
+enables it. Note that at this lowest level there are no policies about
+how ep0 configuration logic is implemented, except that it should obey
+USB specifications. Such issues are in the domain of gadget drivers,
+including knowing about implementation constraints imposed by some USB
+controllers or understanding that composite devices might happen to be
+built by integrating reusable components.
+
+Note that the lifecycle above can be slightly different for OTG devices.
+Other than providing an additional OTG descriptor in each configuration,
+only the HNP-related differences are particularly visible to driver
+code. They involve reporting requirements during the ``SET_CONFIGURATION``
+request, and the option to invoke HNP during some suspend callbacks.
+Also, SRP changes the semantics of ``usb_gadget_wakeup`` slightly.
+
+USB 2.0 Chapter 9 Types and Constants
+-------------------------------------
+
+Gadget drivers rely on common USB structures and constants defined in
+the :ref:`linux/usb/ch9.h <usb_chapter9>` header file, which is standard in
+Linux 2.6+ kernels. These are the same types and constants used by host side
+drivers (and usbcore).
+
+Core Objects and Methods
+------------------------
+
+These are declared in ``<linux/usb/gadget.h>``, and are used by gadget
+drivers to interact with USB peripheral controller drivers.
+
+.. kernel-doc:: include/linux/usb/gadget.h
+ :internal:
+
+Optional Utilities
+------------------
+
+The core API is sufficient for writing a USB Gadget Driver, but some
+optional utilities are provided to simplify common tasks. These
+utilities include endpoint autoconfiguration.
+
+.. kernel-doc:: drivers/usb/gadget/usbstring.c
+ :export:
+
+.. kernel-doc:: drivers/usb/gadget/config.c
+ :export:
+
+Composite Device Framework
+--------------------------
+
+The core API is sufficient for writing drivers for composite USB devices
+(with more than one function in a given configuration), and also
+multi-configuration devices (also more than one function, but not
+necessarily sharing a given configuration). There is however an optional
+framework which makes it easier to reuse and combine functions.
+
+Devices using this framework provide a struct usb_composite_driver,
+which in turn provides one or more struct usb_configuration
+instances. Each such configuration includes at least one struct
+:c:type:`usb_function`, which packages a user visible role such as "network
+link" or "mass storage device". Management functions may also exist,
+such as "Device Firmware Upgrade".
+
+.. kernel-doc:: include/linux/usb/composite.h
+ :internal:
+
+.. kernel-doc:: drivers/usb/gadget/composite.c
+ :export:
+
+Composite Device Functions
+--------------------------
+
+At this writing, a few of the current gadget drivers have been converted
+to this framework. Near-term plans include converting all of them,
+except for ``gadgetfs``.
+
+Peripheral Controller Drivers
+=============================
+
+The first hardware supporting this API was the NetChip 2280 controller,
+which supports USB 2.0 high speed and is based on PCI. This is the
+``net2280`` driver module. The driver supports Linux kernel versions 2.4
+and 2.6; contact NetChip Technologies for development boards and product
+information.
+
+Other hardware working in the ``gadget`` framework includes: Intel's PXA
+25x and IXP42x series processors (``pxa2xx_udc``), Toshiba TC86c001
+"Goku-S" (``goku_udc``), Renesas SH7705/7727 (``sh_udc``), MediaQ 11xx
+(``mq11xx_udc``), Hynix HMS30C7202 (``h7202_udc``), National 9303/4
+(``n9604_udc``), Texas Instruments OMAP (``omap_udc``), Sharp LH7A40x
+(``lh7a40x_udc``), and more. Most of those are full speed controllers.
+
+At this writing, there are people at work on drivers in this framework
+for several other USB device controllers, with plans to make many of
+them be widely available.
+
+A partial USB simulator, the ``dummy_hcd`` driver, is available. It can
+act like a net2280, a pxa25x, or an sa11x0 in terms of available
+endpoints and device speeds; and it simulates control, bulk, and to some
+extent interrupt transfers. That lets you develop some parts of a gadget
+driver on a normal PC, without any special hardware, and perhaps with
+the assistance of tools such as GDB running with User Mode Linux. At
+least one person has expressed interest in adapting that approach,
+hooking it up to a simulator for a microcontroller. Such simulators can
+help debug subsystems where the runtime hardware is unfriendly to
+software development, or is not yet available.
+
+Support for other controllers is expected to be developed and
+contributed over time, as this driver framework evolves.
+
+Gadget Drivers
+==============
+
+In addition to *Gadget Zero* (used primarily for testing and development
+with drivers for usb controller hardware), other gadget drivers exist.
+
+There's an ``ethernet`` gadget driver, which implements one of the most
+useful *Communications Device Class* (CDC) models. One of the standards
+for cable modem interoperability even specifies the use of this ethernet
+model as one of two mandatory options. Gadgets using this code look to a
+USB host as if they're an Ethernet adapter. It provides access to a
+network where the gadget's CPU is one host, which could easily be
+bridging, routing, or firewalling access to other networks. Since some
+hardware can't fully implement the CDC Ethernet requirements, this
+driver also implements a "good parts only" subset of CDC Ethernet. (That
+subset doesn't advertise itself as CDC Ethernet, to avoid creating
+problems.)
+
+Support for Microsoft's ``RNDIS`` protocol has been contributed by
+Pengutronix and Auerswald GmbH. This is like CDC Ethernet, but it runs
+on more slightly USB hardware (but less than the CDC subset). However,
+its main claim to fame is being able to connect directly to recent
+versions of Windows, using drivers that Microsoft bundles and supports,
+making it much simpler to network with Windows.
+
+There is also support for user mode gadget drivers, using ``gadgetfs``.
+This provides a *User Mode API* that presents each endpoint as a single
+file descriptor. I/O is done using normal ``read()`` and ``read()`` calls.
+Familiar tools like GDB and pthreads can be used to develop and debug
+user mode drivers, so that once a robust controller driver is available
+many applications for it won't require new kernel mode software. Linux
+2.6 *Async I/O (AIO)* support is available, so that user mode software
+can stream data with only slightly more overhead than a kernel driver.
+
+There's a USB Mass Storage class driver, which provides a different
+solution for interoperability with systems such as MS-Windows and MacOS.
+That *Mass Storage* driver uses a file or block device as backing store
+for a drive, like the ``loop`` driver. The USB host uses the BBB, CB, or
+CBI versions of the mass storage class specification, using transparent
+SCSI commands to access the data from the backing store.
+
+There's a "serial line" driver, useful for TTY style operation over USB.
+The latest version of that driver supports CDC ACM style operation, like
+a USB modem, and so on most hardware it can interoperate easily with
+MS-Windows. One interesting use of that driver is in boot firmware (like
+a BIOS), which can sometimes use that model with very small systems
+without real serial lines.
+
+Support for other kinds of gadget is expected to be developed and
+contributed over time, as this driver framework evolves.
+
+USB On-The-GO (OTG)
+===================
+
+USB OTG support on Linux 2.6 was initially developed by Texas
+Instruments for `OMAP <http://www.omap.com>`__ 16xx and 17xx series
+processors. Other OTG systems should work in similar ways, but the
+hardware level details could be very different.
+
+Systems need specialized hardware support to implement OTG, notably
+including a special *Mini-AB* jack and associated transceiver to support
+*Dual-Role* operation: they can act either as a host, using the standard
+Linux-USB host side driver stack, or as a peripheral, using this
+``gadget`` framework. To do that, the system software relies on small
+additions to those programming interfaces, and on a new internal
+component (here called an "OTG Controller") affecting which driver stack
+connects to the OTG port. In each role, the system can re-use the
+existing pool of hardware-neutral drivers, layered on top of the
+controller driver interfaces (:c:type:`usb_bus` or :c:type:`usb_gadget`).
+Such drivers need at most minor changes, and most of the calls added to
+support OTG can also benefit non-OTG products.
+
+- Gadget drivers test the ``is_otg`` flag, and use it to determine
+ whether or not to include an OTG descriptor in each of their
+ configurations.
+
+- Gadget drivers may need changes to support the two new OTG protocols,
+ exposed in new gadget attributes such as ``b_hnp_enable`` flag. HNP
+ support should be reported through a user interface (two LEDs could
+ suffice), and is triggered in some cases when the host suspends the
+ peripheral. SRP support can be user-initiated just like remote
+ wakeup, probably by pressing the same button.
+
+- On the host side, USB device drivers need to be taught to trigger HNP
+ at appropriate moments, using ``usb_suspend_device()``. That also
+ conserves battery power, which is useful even for non-OTG
+ configurations.
+
+- Also on the host side, a driver must support the OTG "Targeted
+ Peripheral List". That's just a whitelist, used to reject peripherals
+ not supported with a given Linux OTG host. *This whitelist is
+ product-specific; each product must modify* ``otg_whitelist.h`` *to
+ match its interoperability specification.*
+
+ Non-OTG Linux hosts, like PCs and workstations, normally have some
+ solution for adding drivers, so that peripherals that aren't
+ recognized can eventually be supported. That approach is unreasonable
+ for consumer products that may never have their firmware upgraded,
+ and where it's usually unrealistic to expect traditional
+ PC/workstation/server kinds of support model to work. For example,
+ it's often impractical to change device firmware once the product has
+ been distributed, so driver bugs can't normally be fixed if they're
+ found after shipment.
+
+Additional changes are needed below those hardware-neutral :c:type:`usb_bus`
+and :c:type:`usb_gadget` driver interfaces; those aren't discussed here in any
+detail. Those affect the hardware-specific code for each USB Host or
+Peripheral controller, and how the HCD initializes (since OTG can be
+active only on a single port). They also involve what may be called an
+*OTG Controller Driver*, managing the OTG transceiver and the OTG state
+machine logic as well as much of the root hub behavior for the OTG port.
+The OTG controller driver needs to activate and deactivate USB
+controllers depending on the relevant device role. Some related changes
+were needed inside usbcore, so that it can identify OTG-capable devices
+and respond appropriately to HNP or SRP protocols.
diff --git a/Documentation/driver-api/usb/hotplug.rst b/Documentation/driver-api/usb/hotplug.rst
new file mode 100644
index 0000000000..c1e13107c5
--- /dev/null
+++ b/Documentation/driver-api/usb/hotplug.rst
@@ -0,0 +1,154 @@
+USB hotplugging
+~~~~~~~~~~~~~~~
+
+Linux Hotplugging
+=================
+
+
+In hotpluggable busses like USB (and Cardbus PCI), end-users plug devices
+into the bus with power on. In most cases, users expect the devices to become
+immediately usable. That means the system must do many things, including:
+
+ - Find a driver that can handle the device. That may involve
+ loading a kernel module; newer drivers can use module-init-tools
+ to publish their device (and class) support to user utilities.
+
+ - Bind a driver to that device. Bus frameworks do that using a
+ device driver's probe() routine.
+
+ - Tell other subsystems to configure the new device. Print
+ queues may need to be enabled, networks brought up, disk
+ partitions mounted, and so on. In some cases these will
+ be driver-specific actions.
+
+This involves a mix of kernel mode and user mode actions. Making devices
+be immediately usable means that any user mode actions can't wait for an
+administrator to do them: the kernel must trigger them, either passively
+(triggering some monitoring daemon to invoke a helper program) or
+actively (calling such a user mode helper program directly).
+
+Those triggered actions must support a system's administrative policies;
+such programs are called "policy agents" here. Typically they involve
+shell scripts that dispatch to more familiar administration tools.
+
+Because some of those actions rely on information about drivers (metadata)
+that is currently available only when the drivers are dynamically linked,
+you get the best hotplugging when you configure a highly modular system.
+
+Kernel Hotplug Helper (``/sbin/hotplug``)
+=========================================
+
+There is a kernel parameter: ``/proc/sys/kernel/hotplug``, which normally
+holds the pathname ``/sbin/hotplug``. That parameter names a program
+which the kernel may invoke at various times.
+
+The /sbin/hotplug program can be invoked by any subsystem as part of its
+reaction to a configuration change, from a thread in that subsystem.
+Only one parameter is required: the name of a subsystem being notified of
+some kernel event. That name is used as the first key for further event
+dispatch; any other argument and environment parameters are specified by
+the subsystem making that invocation.
+
+Hotplug software and other resources is available at:
+
+ http://linux-hotplug.sourceforge.net
+
+Mailing list information is also available at that site.
+
+
+USB Policy Agent
+================
+
+The USB subsystem currently invokes ``/sbin/hotplug`` when USB devices
+are added or removed from system. The invocation is done by the kernel
+hub workqueue [hub_wq], or else as part of root hub initialization
+(done by init, modprobe, kapmd, etc). Its single command line parameter
+is the string "usb", and it passes these environment variables:
+
+========== ============================================
+ACTION ``add``, ``remove``
+PRODUCT USB vendor, product, and version codes (hex)
+TYPE device class codes (decimal)
+INTERFACE interface 0 class codes (decimal)
+========== ============================================
+
+If "usbdevfs" is configured, DEVICE and DEVFS are also passed. DEVICE is
+the pathname of the device, and is useful for devices with multiple and/or
+alternate interfaces that complicate driver selection. By design, USB
+hotplugging is independent of ``usbdevfs``: you can do most essential parts
+of USB device setup without using that filesystem, and without running a
+user mode daemon to detect changes in system configuration.
+
+Currently available policy agent implementations can load drivers for
+modules, and can invoke driver-specific setup scripts. The newest ones
+leverage USB module-init-tools support. Later agents might unload drivers.
+
+
+USB Modutils Support
+====================
+
+Current versions of module-init-tools will create a ``modules.usbmap`` file
+which contains the entries from each driver's ``MODULE_DEVICE_TABLE``. Such
+files can be used by various user mode policy agents to make sure all the
+right driver modules get loaded, either at boot time or later.
+
+See ``linux/usb.h`` for full information about such table entries; or look
+at existing drivers. Each table entry describes one or more criteria to
+be used when matching a driver to a device or class of devices. The
+specific criteria are identified by bits set in "match_flags", paired
+with field values. You can construct the criteria directly, or with
+macros such as these, and use driver_info to store more information::
+
+ USB_DEVICE (vendorId, productId)
+ ... matching devices with specified vendor and product ids
+ USB_DEVICE_VER (vendorId, productId, lo, hi)
+ ... like USB_DEVICE with lo <= productversion <= hi
+ USB_INTERFACE_INFO (class, subclass, protocol)
+ ... matching specified interface class info
+ USB_DEVICE_INFO (class, subclass, protocol)
+ ... matching specified device class info
+
+A short example, for a driver that supports several specific USB devices
+and their quirks, might have a MODULE_DEVICE_TABLE like this::
+
+ static const struct usb_device_id mydriver_id_table[] = {
+ { USB_DEVICE (0x9999, 0xaaaa), driver_info: QUIRK_X },
+ { USB_DEVICE (0xbbbb, 0x8888), driver_info: QUIRK_Y|QUIRK_Z },
+ ...
+ { } /* end with an all-zeroes entry */
+ };
+ MODULE_DEVICE_TABLE(usb, mydriver_id_table);
+
+Most USB device drivers should pass these tables to the USB subsystem as
+well as to the module management subsystem. Not all, though: some driver
+frameworks connect using interfaces layered over USB, and so they won't
+need such a struct usb_driver.
+
+Drivers that connect directly to the USB subsystem should be declared
+something like this::
+
+ static struct usb_driver mydriver = {
+ .name = "mydriver",
+ .id_table = mydriver_id_table,
+ .probe = my_probe,
+ .disconnect = my_disconnect,
+
+ /*
+ if using the usb chardev framework:
+ .minor = MY_USB_MINOR_START,
+ .fops = my_file_ops,
+ if exposing any operations through usbdevfs:
+ .ioctl = my_ioctl,
+ */
+ };
+
+When the USB subsystem knows about a driver's device ID table, it's used when
+choosing drivers to probe(). The thread doing new device processing checks
+drivers' device ID entries from the ``MODULE_DEVICE_TABLE`` against interface
+and device descriptors for the device. It will only call ``probe()`` if there
+is a match, and the third argument to ``probe()`` will be the entry that
+matched.
+
+If you don't provide an ``id_table`` for your driver, then your driver may get
+probed for each new device; the third parameter to ``probe()`` will be
+``NULL``.
diff --git a/Documentation/driver-api/usb/index.rst b/Documentation/driver-api/usb/index.rst
new file mode 100644
index 0000000000..cfa8797ea6
--- /dev/null
+++ b/Documentation/driver-api/usb/index.rst
@@ -0,0 +1,30 @@
+=============
+Linux USB API
+=============
+
+.. toctree::
+
+ usb
+ gadget
+ anchors
+ bulk-streams
+ callbacks
+ dma
+ URB
+ power-management
+ hotplug
+ persist
+ error-codes
+ writing_usb_driver
+ dwc3
+ writing_musb_glue_layer
+ typec
+ typec_bus
+ usb3-debug-port
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/usb/persist.rst b/Documentation/driver-api/usb/persist.rst
new file mode 100644
index 0000000000..08cafc6292
--- /dev/null
+++ b/Documentation/driver-api/usb/persist.rst
@@ -0,0 +1,171 @@
+.. _usb-persist:
+
+USB device persistence during system suspend
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+:Author: Alan Stern <stern@rowland.harvard.edu>
+:Date: September 2, 2006 (Updated February 25, 2008)
+
+
+What is the problem?
+====================
+
+According to the USB specification, when a USB bus is suspended the
+bus must continue to supply suspend current (around 1-5 mA). This
+is so that devices can maintain their internal state and hubs can
+detect connect-change events (devices being plugged in or unplugged).
+The technical term is "power session".
+
+If a USB device's power session is interrupted then the system is
+required to behave as though the device has been unplugged. It's a
+conservative approach; in the absence of suspend current the computer
+has no way to know what has actually happened. Perhaps the same
+device is still attached or perhaps it was removed and a different
+device plugged into the port. The system must assume the worst.
+
+By default, Linux behaves according to the spec. If a USB host
+controller loses power during a system suspend, then when the system
+wakes up all the devices attached to that controller are treated as
+though they had disconnected. This is always safe and it is the
+"officially correct" thing to do.
+
+For many sorts of devices this behavior doesn't matter in the least.
+If the kernel wants to believe that your USB keyboard was unplugged
+while the system was asleep and a new keyboard was plugged in when the
+system woke up, who cares? It'll still work the same when you type on
+it.
+
+Unfortunately problems _can_ arise, particularly with mass-storage
+devices. The effect is exactly the same as if the device really had
+been unplugged while the system was suspended. If you had a mounted
+filesystem on the device, you're out of luck -- everything in that
+filesystem is now inaccessible. This is especially annoying if your
+root filesystem was located on the device, since your system will
+instantly crash.
+
+Loss of power isn't the only mechanism to worry about. Anything that
+interrupts a power session will have the same effect. For example,
+even though suspend current may have been maintained while the system
+was asleep, on many systems during the initial stages of wakeup the
+firmware (i.e., the BIOS) resets the motherboard's USB host
+controllers. Result: all the power sessions are destroyed and again
+it's as though you had unplugged all the USB devices. Yes, it's
+entirely the BIOS's fault, but that doesn't do _you_ any good unless
+you can convince the BIOS supplier to fix the problem (lots of luck!).
+
+On many systems the USB host controllers will get reset after a
+suspend-to-RAM. On almost all systems, no suspend current is
+available during hibernation (also known as swsusp or suspend-to-disk).
+You can check the kernel log after resuming to see if either of these
+has happened; look for lines saying "root hub lost power or was reset".
+
+In practice, people are forced to unmount any filesystems on a USB
+device before suspending. If the root filesystem is on a USB device,
+the system can't be suspended at all. (All right, it _can_ be
+suspended -- but it will crash as soon as it wakes up, which isn't
+much better.)
+
+
+What is the solution?
+=====================
+
+The kernel includes a feature called USB-persist. It tries to work
+around these issues by allowing the core USB device data structures to
+persist across a power-session disruption.
+
+It works like this. If the kernel sees that a USB host controller is
+not in the expected state during resume (i.e., if the controller was
+reset or otherwise had lost power) then it applies a persistence check
+to each of the USB devices below that controller for which the
+"persist" attribute is set. It doesn't try to resume the device; that
+can't work once the power session is gone. Instead it issues a USB
+port reset and then re-enumerates the device. (This is exactly the
+same thing that happens whenever a USB device is reset.) If the
+re-enumeration shows that the device now attached to that port has the
+same descriptors as before, including the Vendor and Product IDs, then
+the kernel continues to use the same device structure. In effect, the
+kernel treats the device as though it had merely been reset instead of
+unplugged.
+
+The same thing happens if the host controller is in the expected state
+but a USB device was unplugged and then replugged, or if a USB device
+fails to carry out a normal resume.
+
+If no device is now attached to the port, or if the descriptors are
+different from what the kernel remembers, then the treatment is what
+you would expect. The kernel destroys the old device structure and
+behaves as though the old device had been unplugged and a new device
+plugged in.
+
+The end result is that the USB device remains available and usable.
+Filesystem mounts and memory mappings are unaffected, and the world is
+now a good and happy place.
+
+Note that the "USB-persist" feature will be applied only to those
+devices for which it is enabled. You can enable the feature by doing
+(as root)::
+
+ echo 1 >/sys/bus/usb/devices/.../power/persist
+
+where the "..." should be filled in the with the device's ID. Disable
+the feature by writing 0 instead of 1. For hubs the feature is
+automatically and permanently enabled and the power/persist file
+doesn't even exist, so you only have to worry about setting it for
+devices where it really matters.
+
+
+Is this the best solution?
+==========================
+
+Perhaps not. Arguably, keeping track of mounted filesystems and
+memory mappings across device disconnects should be handled by a
+centralized Logical Volume Manager. Such a solution would allow you
+to plug in a USB flash device, create a persistent volume associated
+with it, unplug the flash device, plug it back in later, and still
+have the same persistent volume associated with the device. As such
+it would be more far-reaching than USB-persist.
+
+On the other hand, writing a persistent volume manager would be a big
+job and using it would require significant input from the user. This
+solution is much quicker and easier -- and it exists now, a giant
+point in its favor!
+
+Furthermore, the USB-persist feature applies to _all_ USB devices, not
+just mass-storage devices. It might turn out to be equally useful for
+other device types, such as network interfaces.
+
+
+WARNING: USB-persist can be dangerous!!
+=======================================
+
+When recovering an interrupted power session the kernel does its best
+to make sure the USB device hasn't been changed; that is, the same
+device is still plugged into the port as before. But the checks
+aren't guaranteed to be 100% accurate.
+
+If you replace one USB device with another of the same type (same
+manufacturer, same IDs, and so on) there's an excellent chance the
+kernel won't detect the change. The serial number string and other
+descriptors are compared with the kernel's stored values, but this
+might not help since manufacturers frequently omit serial numbers
+entirely in their devices.
+
+Furthermore it's quite possible to leave a USB device exactly the same
+while changing its media. If you replace the flash memory card in a
+USB card reader while the system is asleep, the kernel will have no
+way to know you did it. The kernel will assume that nothing has
+happened and will continue to use the partition tables, inodes, and
+memory mappings for the old card.
+
+If the kernel gets fooled in this way, it's almost certain to cause
+data corruption and to crash your system. You'll have no one to blame
+but yourself.
+
+For those devices with avoid_reset_quirk attribute being set, persist
+maybe fail because they may morph after reset.
+
+YOU HAVE BEEN WARNED! USE AT YOUR OWN RISK!
+
+That having been said, most of the time there shouldn't be any trouble
+at all. The USB-persist feature can be extremely useful. Make the
+most of it.
diff --git a/Documentation/driver-api/usb/power-management.rst b/Documentation/driver-api/usb/power-management.rst
new file mode 100644
index 0000000000..2525c3622c
--- /dev/null
+++ b/Documentation/driver-api/usb/power-management.rst
@@ -0,0 +1,798 @@
+.. _usb-power-management:
+
+Power Management for USB
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+:Author: Alan Stern <stern@rowland.harvard.edu>
+:Date: Last-updated: February 2014
+
+..
+ Contents:
+ ---------
+ * What is Power Management?
+ * What is Remote Wakeup?
+ * When is a USB device idle?
+ * Forms of dynamic PM
+ * The user interface for dynamic PM
+ * Changing the default idle-delay time
+ * Warnings
+ * The driver interface for Power Management
+ * The driver interface for autosuspend and autoresume
+ * Other parts of the driver interface
+ * Mutual exclusion
+ * Interaction between dynamic PM and system PM
+ * xHCI hardware link PM
+ * USB Port Power Control
+ * User Interface for Port Power Control
+ * Suggested Userspace Port Power Policy
+
+
+What is Power Management?
+-------------------------
+
+Power Management (PM) is the practice of saving energy by suspending
+parts of a computer system when they aren't being used. While a
+component is ``suspended`` it is in a nonfunctional low-power state; it
+might even be turned off completely. A suspended component can be
+``resumed`` (returned to a functional full-power state) when the kernel
+needs to use it. (There also are forms of PM in which components are
+placed in a less functional but still usable state instead of being
+suspended; an example would be reducing the CPU's clock rate. This
+document will not discuss those other forms.)
+
+When the parts being suspended include the CPU and most of the rest of
+the system, we speak of it as a "system suspend". When a particular
+device is turned off while the system as a whole remains running, we
+call it a "dynamic suspend" (also known as a "runtime suspend" or
+"selective suspend"). This document concentrates mostly on how
+dynamic PM is implemented in the USB subsystem, although system PM is
+covered to some extent (see ``Documentation/power/*.rst`` for more
+information about system PM).
+
+System PM support is present only if the kernel was built with
+``CONFIG_SUSPEND`` or ``CONFIG_HIBERNATION`` enabled. Dynamic PM support
+
+for USB is present whenever
+the kernel was built with ``CONFIG_PM`` enabled.
+
+[Historically, dynamic PM support for USB was present only if the
+kernel had been built with ``CONFIG_USB_SUSPEND`` enabled (which depended on
+``CONFIG_PM_RUNTIME``). Starting with the 3.10 kernel release, dynamic PM
+support for USB was present whenever the kernel was built with
+``CONFIG_PM_RUNTIME`` enabled. The ``CONFIG_USB_SUSPEND`` option had been
+eliminated.]
+
+
+What is Remote Wakeup?
+----------------------
+
+When a device has been suspended, it generally doesn't resume until
+the computer tells it to. Likewise, if the entire computer has been
+suspended, it generally doesn't resume until the user tells it to, say
+by pressing a power button or opening the cover.
+
+However some devices have the capability of resuming by themselves, or
+asking the kernel to resume them, or even telling the entire computer
+to resume. This capability goes by several names such as "Wake On
+LAN"; we will refer to it generically as "remote wakeup". When a
+device is enabled for remote wakeup and it is suspended, it may resume
+itself (or send a request to be resumed) in response to some external
+event. Examples include a suspended keyboard resuming when a key is
+pressed, or a suspended USB hub resuming when a device is plugged in.
+
+
+When is a USB device idle?
+--------------------------
+
+A device is idle whenever the kernel thinks it's not busy doing
+anything important and thus is a candidate for being suspended. The
+exact definition depends on the device's driver; drivers are allowed
+to declare that a device isn't idle even when there's no actual
+communication taking place. (For example, a hub isn't considered idle
+unless all the devices plugged into that hub are already suspended.)
+In addition, a device isn't considered idle so long as a program keeps
+its usbfs file open, whether or not any I/O is going on.
+
+If a USB device has no driver, its usbfs file isn't open, and it isn't
+being accessed through sysfs, then it definitely is idle.
+
+
+Forms of dynamic PM
+-------------------
+
+Dynamic suspends occur when the kernel decides to suspend an idle
+device. This is called ``autosuspend`` for short. In general, a device
+won't be autosuspended unless it has been idle for some minimum period
+of time, the so-called idle-delay time.
+
+Of course, nothing the kernel does on its own initiative should
+prevent the computer or its devices from working properly. If a
+device has been autosuspended and a program tries to use it, the
+kernel will automatically resume the device (autoresume). For the
+same reason, an autosuspended device will usually have remote wakeup
+enabled, if the device supports remote wakeup.
+
+It is worth mentioning that many USB drivers don't support
+autosuspend. In fact, at the time of this writing (Linux 2.6.23) the
+only drivers which do support it are the hub driver, kaweth, asix,
+usblp, usblcd, and usb-skeleton (which doesn't count). If a
+non-supporting driver is bound to a device, the device won't be
+autosuspended. In effect, the kernel pretends the device is never
+idle.
+
+We can categorize power management events in two broad classes:
+external and internal. External events are those triggered by some
+agent outside the USB stack: system suspend/resume (triggered by
+userspace), manual dynamic resume (also triggered by userspace), and
+remote wakeup (triggered by the device). Internal events are those
+triggered within the USB stack: autosuspend and autoresume. Note that
+all dynamic suspend events are internal; external agents are not
+allowed to issue dynamic suspends.
+
+
+The user interface for dynamic PM
+---------------------------------
+
+The user interface for controlling dynamic PM is located in the ``power/``
+subdirectory of each USB device's sysfs directory, that is, in
+``/sys/bus/usb/devices/.../power/`` where "..." is the device's ID. The
+relevant attribute files are: wakeup, control, and
+``autosuspend_delay_ms``. (There may also be a file named ``level``; this
+file was deprecated as of the 2.6.35 kernel and replaced by the
+``control`` file. In 2.6.38 the ``autosuspend`` file will be deprecated
+and replaced by the ``autosuspend_delay_ms`` file. The only difference
+is that the newer file expresses the delay in milliseconds whereas the
+older file uses seconds. Confusingly, both files are present in 2.6.37
+but only ``autosuspend`` works.)
+
+ ``power/wakeup``
+
+ This file is empty if the device does not support
+ remote wakeup. Otherwise the file contains either the
+ word ``enabled`` or the word ``disabled``, and you can
+ write those words to the file. The setting determines
+ whether or not remote wakeup will be enabled when the
+ device is next suspended. (If the setting is changed
+ while the device is suspended, the change won't take
+ effect until the following suspend.)
+
+ ``power/control``
+
+ This file contains one of two words: ``on`` or ``auto``.
+ You can write those words to the file to change the
+ device's setting.
+
+ - ``on`` means that the device should be resumed and
+ autosuspend is not allowed. (Of course, system
+ suspends are still allowed.)
+
+ - ``auto`` is the normal state in which the kernel is
+ allowed to autosuspend and autoresume the device.
+
+ (In kernels up to 2.6.32, you could also specify
+ ``suspend``, meaning that the device should remain
+ suspended and autoresume was not allowed. This
+ setting is no longer supported.)
+
+ ``power/autosuspend_delay_ms``
+
+ This file contains an integer value, which is the
+ number of milliseconds the device should remain idle
+ before the kernel will autosuspend it (the idle-delay
+ time). The default is 2000. 0 means to autosuspend
+ as soon as the device becomes idle, and negative
+ values mean never to autosuspend. You can write a
+ number to the file to change the autosuspend
+ idle-delay time.
+
+Writing ``-1`` to ``power/autosuspend_delay_ms`` and writing ``on`` to
+``power/control`` do essentially the same thing -- they both prevent the
+device from being autosuspended. Yes, this is a redundancy in the
+API.
+
+(In 2.6.21 writing ``0`` to ``power/autosuspend`` would prevent the device
+from being autosuspended; the behavior was changed in 2.6.22. The
+``power/autosuspend`` attribute did not exist prior to 2.6.21, and the
+``power/level`` attribute did not exist prior to 2.6.22. ``power/control``
+was added in 2.6.34, and ``power/autosuspend_delay_ms`` was added in
+2.6.37 but did not become functional until 2.6.38.)
+
+
+Changing the default idle-delay time
+------------------------------------
+
+The default autosuspend idle-delay time (in seconds) is controlled by
+a module parameter in usbcore. You can specify the value when usbcore
+is loaded. For example, to set it to 5 seconds instead of 2 you would
+do::
+
+ modprobe usbcore autosuspend=5
+
+Equivalently, you could add to a configuration file in /etc/modprobe.d
+a line saying::
+
+ options usbcore autosuspend=5
+
+Some distributions load the usbcore module very early during the boot
+process, by means of a program or script running from an initramfs
+image. To alter the parameter value you would have to rebuild that
+image.
+
+If usbcore is compiled into the kernel rather than built as a loadable
+module, you can add::
+
+ usbcore.autosuspend=5
+
+to the kernel's boot command line.
+
+Finally, the parameter value can be changed while the system is
+running. If you do::
+
+ echo 5 >/sys/module/usbcore/parameters/autosuspend
+
+then each new USB device will have its autosuspend idle-delay
+initialized to 5. (The idle-delay values for already existing devices
+will not be affected.)
+
+Setting the initial default idle-delay to -1 will prevent any
+autosuspend of any USB device. This has the benefit of allowing you
+then to enable autosuspend for selected devices.
+
+
+Warnings
+--------
+
+The USB specification states that all USB devices must support power
+management. Nevertheless, the sad fact is that many devices do not
+support it very well. You can suspend them all right, but when you
+try to resume them they disconnect themselves from the USB bus or
+they stop working entirely. This seems to be especially prevalent
+among printers and scanners, but plenty of other types of device have
+the same deficiency.
+
+For this reason, by default the kernel disables autosuspend (the
+``power/control`` attribute is initialized to ``on``) for all devices other
+than hubs. Hubs, at least, appear to be reasonably well-behaved in
+this regard.
+
+(In 2.6.21 and 2.6.22 this wasn't the case. Autosuspend was enabled
+by default for almost all USB devices. A number of people experienced
+problems as a result.)
+
+This means that non-hub devices won't be autosuspended unless the user
+or a program explicitly enables it. As of this writing there aren't
+any widespread programs which will do this; we hope that in the near
+future device managers such as HAL will take on this added
+responsibility. In the meantime you can always carry out the
+necessary operations by hand or add them to a udev script. You can
+also change the idle-delay time; 2 seconds is not the best choice for
+every device.
+
+If a driver knows that its device has proper suspend/resume support,
+it can enable autosuspend all by itself. For example, the video
+driver for a laptop's webcam might do this (in recent kernels they
+do), since these devices are rarely used and so should normally be
+autosuspended.
+
+Sometimes it turns out that even when a device does work okay with
+autosuspend there are still problems. For example, the usbhid driver,
+which manages keyboards and mice, has autosuspend support. Tests with
+a number of keyboards show that typing on a suspended keyboard, while
+causing the keyboard to do a remote wakeup all right, will nonetheless
+frequently result in lost keystrokes. Tests with mice show that some
+of them will issue a remote-wakeup request in response to button
+presses but not to motion, and some in response to neither.
+
+The kernel will not prevent you from enabling autosuspend on devices
+that can't handle it. It is even possible in theory to damage a
+device by suspending it at the wrong time. (Highly unlikely, but
+possible.) Take care.
+
+
+The driver interface for Power Management
+-----------------------------------------
+
+The requirements for a USB driver to support external power management
+are pretty modest; the driver need only define::
+
+ .suspend
+ .resume
+ .reset_resume
+
+methods in its :c:type:`usb_driver` structure, and the ``reset_resume`` method
+is optional. The methods' jobs are quite simple:
+
+ - The ``suspend`` method is called to warn the driver that the
+ device is going to be suspended. If the driver returns a
+ negative error code, the suspend will be aborted. Normally
+ the driver will return 0, in which case it must cancel all
+ outstanding URBs (:c:func:`usb_kill_urb`) and not submit any more.
+
+ - The ``resume`` method is called to tell the driver that the
+ device has been resumed and the driver can return to normal
+ operation. URBs may once more be submitted.
+
+ - The ``reset_resume`` method is called to tell the driver that
+ the device has been resumed and it also has been reset.
+ The driver should redo any necessary device initialization,
+ since the device has probably lost most or all of its state
+ (although the interfaces will be in the same altsettings as
+ before the suspend).
+
+If the device is disconnected or powered down while it is suspended,
+the ``disconnect`` method will be called instead of the ``resume`` or
+``reset_resume`` method. This is also quite likely to happen when
+waking up from hibernation, as many systems do not maintain suspend
+current to the USB host controllers during hibernation. (It's
+possible to work around the hibernation-forces-disconnect problem by
+using the USB Persist facility.)
+
+The ``reset_resume`` method is used by the USB Persist facility (see
+:ref:`usb-persist`) and it can also be used under certain
+circumstances when ``CONFIG_USB_PERSIST`` is not enabled. Currently, if a
+device is reset during a resume and the driver does not have a
+``reset_resume`` method, the driver won't receive any notification about
+the resume. Later kernels will call the driver's ``disconnect`` method;
+2.6.23 doesn't do this.
+
+USB drivers are bound to interfaces, so their ``suspend`` and ``resume``
+methods get called when the interfaces are suspended or resumed. In
+principle one might want to suspend some interfaces on a device (i.e.,
+force the drivers for those interface to stop all activity) without
+suspending the other interfaces. The USB core doesn't allow this; all
+interfaces are suspended when the device itself is suspended and all
+interfaces are resumed when the device is resumed. It isn't possible
+to suspend or resume some but not all of a device's interfaces. The
+closest you can come is to unbind the interfaces' drivers.
+
+
+The driver interface for autosuspend and autoresume
+---------------------------------------------------
+
+To support autosuspend and autoresume, a driver should implement all
+three of the methods listed above. In addition, a driver indicates
+that it supports autosuspend by setting the ``.supports_autosuspend`` flag
+in its usb_driver structure. It is then responsible for informing the
+USB core whenever one of its interfaces becomes busy or idle. The
+driver does so by calling these six functions::
+
+ int usb_autopm_get_interface(struct usb_interface *intf);
+ void usb_autopm_put_interface(struct usb_interface *intf);
+ int usb_autopm_get_interface_async(struct usb_interface *intf);
+ void usb_autopm_put_interface_async(struct usb_interface *intf);
+ void usb_autopm_get_interface_no_resume(struct usb_interface *intf);
+ void usb_autopm_put_interface_no_suspend(struct usb_interface *intf);
+
+The functions work by maintaining a usage counter in the
+usb_interface's embedded device structure. When the counter is > 0
+then the interface is deemed to be busy, and the kernel will not
+autosuspend the interface's device. When the usage counter is = 0
+then the interface is considered to be idle, and the kernel may
+autosuspend the device.
+
+Drivers must be careful to balance their overall changes to the usage
+counter. Unbalanced "get"s will remain in effect when a driver is
+unbound from its interface, preventing the device from going into
+runtime suspend should the interface be bound to a driver again. On
+the other hand, drivers are allowed to achieve this balance by calling
+the ``usb_autopm_*`` functions even after their ``disconnect`` routine
+has returned -- say from within a work-queue routine -- provided they
+retain an active reference to the interface (via ``usb_get_intf`` and
+``usb_put_intf``).
+
+Drivers using the async routines are responsible for their own
+synchronization and mutual exclusion.
+
+ :c:func:`usb_autopm_get_interface` increments the usage counter and
+ does an autoresume if the device is suspended. If the
+ autoresume fails, the counter is decremented back.
+
+ :c:func:`usb_autopm_put_interface` decrements the usage counter and
+ attempts an autosuspend if the new value is = 0.
+
+ :c:func:`usb_autopm_get_interface_async` and
+ :c:func:`usb_autopm_put_interface_async` do almost the same things as
+ their non-async counterparts. The big difference is that they
+ use a workqueue to do the resume or suspend part of their
+ jobs. As a result they can be called in an atomic context,
+ such as an URB's completion handler, but when they return the
+ device will generally not yet be in the desired state.
+
+ :c:func:`usb_autopm_get_interface_no_resume` and
+ :c:func:`usb_autopm_put_interface_no_suspend` merely increment or
+ decrement the usage counter; they do not attempt to carry out
+ an autoresume or an autosuspend. Hence they can be called in
+ an atomic context.
+
+The simplest usage pattern is that a driver calls
+:c:func:`usb_autopm_get_interface` in its open routine and
+:c:func:`usb_autopm_put_interface` in its close or release routine. But other
+patterns are possible.
+
+The autosuspend attempts mentioned above will often fail for one
+reason or another. For example, the ``power/control`` attribute might be
+set to ``on``, or another interface in the same device might not be
+idle. This is perfectly normal. If the reason for failure was that
+the device hasn't been idle for long enough, a timer is scheduled to
+carry out the operation automatically when the autosuspend idle-delay
+has expired.
+
+Autoresume attempts also can fail, although failure would mean that
+the device is no longer present or operating properly. Unlike
+autosuspend, there's no idle-delay for an autoresume.
+
+
+Other parts of the driver interface
+-----------------------------------
+
+Drivers can enable autosuspend for their devices by calling::
+
+ usb_enable_autosuspend(struct usb_device *udev);
+
+in their :c:func:`probe` routine, if they know that the device is capable of
+suspending and resuming correctly. This is exactly equivalent to
+writing ``auto`` to the device's ``power/control`` attribute. Likewise,
+drivers can disable autosuspend by calling::
+
+ usb_disable_autosuspend(struct usb_device *udev);
+
+This is exactly the same as writing ``on`` to the ``power/control`` attribute.
+
+Sometimes a driver needs to make sure that remote wakeup is enabled
+during autosuspend. For example, there's not much point
+autosuspending a keyboard if the user can't cause the keyboard to do a
+remote wakeup by typing on it. If the driver sets
+``intf->needs_remote_wakeup`` to 1, the kernel won't autosuspend the
+device if remote wakeup isn't available. (If the device is already
+autosuspended, though, setting this flag won't cause the kernel to
+autoresume it. Normally a driver would set this flag in its ``probe``
+method, at which time the device is guaranteed not to be
+autosuspended.)
+
+If a driver does its I/O asynchronously in interrupt context, it
+should call :c:func:`usb_autopm_get_interface_async` before starting output and
+:c:func:`usb_autopm_put_interface_async` when the output queue drains. When
+it receives an input event, it should call::
+
+ usb_mark_last_busy(struct usb_device *udev);
+
+in the event handler. This tells the PM core that the device was just
+busy and therefore the next autosuspend idle-delay expiration should
+be pushed back. Many of the usb_autopm_* routines also make this call,
+so drivers need to worry only when interrupt-driven input arrives.
+
+Asynchronous operation is always subject to races. For example, a
+driver may call the :c:func:`usb_autopm_get_interface_async` routine at a time
+when the core has just finished deciding the device has been idle for
+long enough but not yet gotten around to calling the driver's ``suspend``
+method. The ``suspend`` method must be responsible for synchronizing with
+the I/O request routine and the URB completion handler; it should
+cause autosuspends to fail with -EBUSY if the driver needs to use the
+device.
+
+External suspend calls should never be allowed to fail in this way,
+only autosuspend calls. The driver can tell them apart by applying
+the :c:func:`PMSG_IS_AUTO` macro to the message argument to the ``suspend``
+method; it will return True for internal PM events (autosuspend) and
+False for external PM events.
+
+
+Mutual exclusion
+----------------
+
+For external events -- but not necessarily for autosuspend or
+autoresume -- the device semaphore (udev->dev.sem) will be held when a
+``suspend`` or ``resume`` method is called. This implies that external
+suspend/resume events are mutually exclusive with calls to ``probe``,
+``disconnect``, ``pre_reset``, and ``post_reset``; the USB core guarantees that
+this is true of autosuspend/autoresume events as well.
+
+If a driver wants to block all suspend/resume calls during some
+critical section, the best way is to lock the device and call
+:c:func:`usb_autopm_get_interface` (and do the reverse at the end of the
+critical section). Holding the device semaphore will block all
+external PM calls, and the :c:func:`usb_autopm_get_interface` will prevent any
+internal PM calls, even if it fails. (Exercise: Why?)
+
+
+Interaction between dynamic PM and system PM
+--------------------------------------------
+
+Dynamic power management and system power management can interact in
+a couple of ways.
+
+Firstly, a device may already be autosuspended when a system suspend
+occurs. Since system suspends are supposed to be as transparent as
+possible, the device should remain suspended following the system
+resume. But this theory may not work out well in practice; over time
+the kernel's behavior in this regard has changed. As of 2.6.37 the
+policy is to resume all devices during a system resume and let them
+handle their own runtime suspends afterward.
+
+Secondly, a dynamic power-management event may occur as a system
+suspend is underway. The window for this is short, since system
+suspends don't take long (a few seconds usually), but it can happen.
+For example, a suspended device may send a remote-wakeup signal while
+the system is suspending. The remote wakeup may succeed, which would
+cause the system suspend to abort. If the remote wakeup doesn't
+succeed, it may still remain active and thus cause the system to
+resume as soon as the system suspend is complete. Or the remote
+wakeup may fail and get lost. Which outcome occurs depends on timing
+and on the hardware and firmware design.
+
+
+xHCI hardware link PM
+---------------------
+
+xHCI host controller provides hardware link power management to usb2.0
+(xHCI 1.0 feature) and usb3.0 devices which support link PM. By
+enabling hardware LPM, the host can automatically put the device into
+lower power state(L1 for usb2.0 devices, or U1/U2 for usb3.0 devices),
+which state device can enter and resume very quickly.
+
+The user interface for controlling hardware LPM is located in the
+``power/`` subdirectory of each USB device's sysfs directory, that is, in
+``/sys/bus/usb/devices/.../power/`` where "..." is the device's ID. The
+relevant attribute files are ``usb2_hardware_lpm`` and ``usb3_hardware_lpm``.
+
+ ``power/usb2_hardware_lpm``
+
+ When a USB2 device which support LPM is plugged to a
+ xHCI host root hub which support software LPM, the
+ host will run a software LPM test for it; if the device
+ enters L1 state and resume successfully and the host
+ supports USB2 hardware LPM, this file will show up and
+ driver will enable hardware LPM for the device. You
+ can write y/Y/1 or n/N/0 to the file to enable/disable
+ USB2 hardware LPM manually. This is for test purpose mainly.
+
+ ``power/usb3_hardware_lpm_u1``
+ ``power/usb3_hardware_lpm_u2``
+
+ When a USB 3.0 lpm-capable device is plugged in to a
+ xHCI host which supports link PM, it will check if U1
+ and U2 exit latencies have been set in the BOS
+ descriptor; if the check is passed and the host
+ supports USB3 hardware LPM, USB3 hardware LPM will be
+ enabled for the device and these files will be created.
+ The files hold a string value (enable or disable)
+ indicating whether or not USB3 hardware LPM U1 or U2
+ is enabled for the device.
+
+USB Port Power Control
+----------------------
+
+In addition to suspending endpoint devices and enabling hardware
+controlled link power management, the USB subsystem also has the
+capability to disable power to ports under some conditions. Power is
+controlled through ``Set/ClearPortFeature(PORT_POWER)`` requests to a hub.
+In the case of a root or platform-internal hub the host controller
+driver translates ``PORT_POWER`` requests into platform firmware (ACPI)
+method calls to set the port power state. For more background see the
+Linux Plumbers Conference 2012 slides [#f1]_ and video [#f2]_:
+
+Upon receiving a ``ClearPortFeature(PORT_POWER)`` request a USB port is
+logically off, and may trigger the actual loss of VBUS to the port [#f3]_.
+VBUS may be maintained in the case where a hub gangs multiple ports into
+a shared power well causing power to remain until all ports in the gang
+are turned off. VBUS may also be maintained by hub ports configured for
+a charging application. In any event a logically off port will lose
+connection with its device, not respond to hotplug events, and not
+respond to remote wakeup events.
+
+.. warning::
+
+ turning off a port may result in the inability to hot add a device.
+ Please see "User Interface for Port Power Control" for details.
+
+As far as the effect on the device itself it is similar to what a device
+goes through during system suspend, i.e. the power session is lost. Any
+USB device or driver that misbehaves with system suspend will be
+similarly affected by a port power cycle event. For this reason the
+implementation shares the same device recovery path (and honors the same
+quirks) as the system resume path for the hub.
+
+.. [#f1]
+
+ http://dl.dropbox.com/u/96820575/sarah-sharp-lpt-port-power-off2-mini.pdf
+
+.. [#f2]
+
+ http://linuxplumbers.ubicast.tv/videos/usb-port-power-off-kerneluserspace-api/
+
+.. [#f3]
+
+ USB 3.1 Section 10.12
+
+ wakeup note: if a device is configured to send wakeup events the port
+ power control implementation will block poweroff attempts on that
+ port.
+
+
+User Interface for Port Power Control
+-------------------------------------
+
+The port power control mechanism uses the PM runtime system. Poweroff is
+requested by clearing the ``power/pm_qos_no_power_off`` flag of the port device
+(defaults to 1). If the port is disconnected it will immediately receive a
+``ClearPortFeature(PORT_POWER)`` request. Otherwise, it will honor the pm
+runtime rules and require the attached child device and all descendants to be
+suspended. This mechanism is dependent on the hub advertising port power
+switching in its hub descriptor (wHubCharacteristics logical power switching
+mode field).
+
+Note, some interface devices/drivers do not support autosuspend. Userspace may
+need to unbind the interface drivers before the :c:type:`usb_device` will
+suspend. An unbound interface device is suspended by default. When unbinding,
+be careful to unbind interface drivers, not the driver of the parent usb
+device. Also, leave hub interface drivers bound. If the driver for the usb
+device (not interface) is unbound the kernel is no longer able to resume the
+device. If a hub interface driver is unbound, control of its child ports is
+lost and all attached child-devices will disconnect. A good rule of thumb is
+that if the 'driver/module' link for a device points to
+``/sys/module/usbcore`` then unbinding it will interfere with port power
+control.
+
+Example of the relevant files for port power control. Note, in this example
+these files are relative to a usb hub device (prefix)::
+
+ prefix=/sys/devices/pci0000:00/0000:00:14.0/usb3/3-1
+
+ attached child device +
+ hub port device + |
+ hub interface device + | |
+ v v v
+ $prefix/3-1:1.0/3-1-port1/device
+
+ $prefix/3-1:1.0/3-1-port1/power/pm_qos_no_power_off
+ $prefix/3-1:1.0/3-1-port1/device/power/control
+ $prefix/3-1:1.0/3-1-port1/device/3-1.1:<intf0>/driver/unbind
+ $prefix/3-1:1.0/3-1-port1/device/3-1.1:<intf1>/driver/unbind
+ ...
+ $prefix/3-1:1.0/3-1-port1/device/3-1.1:<intfN>/driver/unbind
+
+In addition to these files some ports may have a 'peer' link to a port on
+another hub. The expectation is that all superspeed ports have a
+hi-speed peer::
+
+ $prefix/3-1:1.0/3-1-port1/peer -> ../../../../usb2/2-1/2-1:1.0/2-1-port1
+ ../../../../usb2/2-1/2-1:1.0/2-1-port1/peer -> ../../../../usb3/3-1/3-1:1.0/3-1-port1
+
+Distinct from 'companion ports', or 'ehci/xhci shared switchover ports'
+peer ports are simply the hi-speed and superspeed interface pins that
+are combined into a single usb3 connector. Peer ports share the same
+ancestor XHCI device.
+
+While a superspeed port is powered off a device may downgrade its
+connection and attempt to connect to the hi-speed pins. The
+implementation takes steps to prevent this:
+
+1. Port suspend is sequenced to guarantee that hi-speed ports are powered-off
+ before their superspeed peer is permitted to power-off. The implication is
+ that the setting ``pm_qos_no_power_off`` to zero on a superspeed port may
+ not cause the port to power-off until its highspeed peer has gone to its
+ runtime suspend state. Userspace must take care to order the suspensions
+ if it wants to guarantee that a superspeed port will power-off.
+
+2. Port resume is sequenced to force a superspeed port to power-on prior to its
+ highspeed peer.
+
+3. Port resume always triggers an attached child device to resume. After a
+ power session is lost the device may have been removed, or need reset.
+ Resuming the child device when the parent port regains power resolves those
+ states and clamps the maximum port power cycle frequency at the rate the
+ child device can suspend (autosuspend-delay) and resume (reset-resume
+ latency).
+
+Sysfs files relevant for port power control:
+
+ ``<hubdev-portX>/power/pm_qos_no_power_off``:
+ This writable flag controls the state of an idle port.
+ Once all children and descendants have suspended the
+ port may suspend/poweroff provided that
+ pm_qos_no_power_off is '0'. If pm_qos_no_power_off is
+ '1' the port will remain active/powered regardless of
+ the stats of descendants. Defaults to 1.
+
+ ``<hubdev-portX>/power/runtime_status``:
+ This file reflects whether the port is 'active' (power is on)
+ or 'suspended' (logically off). There is no indication to
+ userspace whether VBUS is still supplied.
+
+ ``<hubdev-portX>/connect_type``:
+ An advisory read-only flag to userspace indicating the
+ location and connection type of the port. It returns
+ one of four values 'hotplug', 'hardwired', 'not used',
+ and 'unknown'. All values, besides unknown, are set by
+ platform firmware.
+
+ ``hotplug`` indicates an externally connectable/visible
+ port on the platform. Typically userspace would choose
+ to keep such a port powered to handle new device
+ connection events.
+
+ ``hardwired`` refers to a port that is not visible but
+ connectable. Examples are internal ports for USB
+ bluetooth that can be disconnected via an external
+ switch or a port with a hardwired USB camera. It is
+ expected to be safe to allow these ports to suspend
+ provided pm_qos_no_power_off is coordinated with any
+ switch that gates connections. Userspace must arrange
+ for the device to be connected prior to the port
+ powering off, or to activate the port prior to enabling
+ connection via a switch.
+
+ ``not used`` refers to an internal port that is expected
+ to never have a device connected to it. These may be
+ empty internal ports, or ports that are not physically
+ exposed on a platform. Considered safe to be
+ powered-off at all times.
+
+ ``unknown`` means platform firmware does not provide
+ information for this port. Most commonly refers to
+ external hub ports which should be considered 'hotplug'
+ for policy decisions.
+
+ .. note::
+
+ - since we are relying on the BIOS to get this ACPI
+ information correct, the USB port descriptions may
+ be missing or wrong.
+
+ - Take care in clearing ``pm_qos_no_power_off``. Once
+ power is off this port will
+ not respond to new connect events.
+
+ Once a child device is attached additional constraints are
+ applied before the port is allowed to poweroff.
+
+ ``<child>/power/control``:
+ Must be ``auto``, and the port will not
+ power down until ``<child>/power/runtime_status``
+ reflects the 'suspended' state. Default
+ value is controlled by child device driver.
+
+ ``<child>/power/persist``:
+ This defaults to ``1`` for most devices and indicates if
+ kernel can persist the device's configuration across a
+ power session loss (suspend / port-power event). When
+ this value is ``0`` (quirky devices), port poweroff is
+ disabled.
+
+ ``<child>/driver/unbind``:
+ Wakeup capable devices will block port poweroff. At
+ this time the only mechanism to clear the usb-internal
+ wakeup-capability for an interface device is to unbind
+ its driver.
+
+Summary of poweroff pre-requisite settings relative to a port device::
+
+ echo 0 > power/pm_qos_no_power_off
+ echo 0 > peer/power/pm_qos_no_power_off # if it exists
+ echo auto > power/control # this is the default value
+ echo auto > <child>/power/control
+ echo 1 > <child>/power/persist # this is the default value
+
+Suggested Userspace Port Power Policy
+-------------------------------------
+
+As noted above userspace needs to be careful and deliberate about what
+ports are enabled for poweroff.
+
+The default configuration is that all ports start with
+``power/pm_qos_no_power_off`` set to ``1`` causing ports to always remain
+active.
+
+Given confidence in the platform firmware's description of the ports
+(ACPI _PLD record for a port populates 'connect_type') userspace can
+clear pm_qos_no_power_off for all 'not used' ports. The same can be
+done for 'hardwired' ports provided poweroff is coordinated with any
+connection switch for the port.
+
+A more aggressive userspace policy is to enable USB port power off for
+all ports (set ``<hubdev-portX>/power/pm_qos_no_power_off`` to ``0``) when
+some external factor indicates the user has stopped interacting with the
+system. For example, a distro may want to enable power off all USB
+ports when the screen blanks, and re-power them when the screen becomes
+active. Smart phones and tablets may want to power off USB ports when
+the user pushes the power button.
diff --git a/Documentation/driver-api/usb/typec.rst b/Documentation/driver-api/usb/typec.rst
new file mode 100644
index 0000000000..201163d8c1
--- /dev/null
+++ b/Documentation/driver-api/usb/typec.rst
@@ -0,0 +1,234 @@
+.. _typec:
+
+USB Type-C connector class
+==========================
+
+Introduction
+------------
+
+The typec class is meant for describing the USB Type-C ports in a system to the
+user space in unified fashion. The class is designed to provide nothing else
+except the user space interface implementation in hope that it can be utilized
+on as many platforms as possible.
+
+The platforms are expected to register every USB Type-C port they have with the
+class. In a normal case the registration will be done by a USB Type-C or PD PHY
+driver, but it may be a driver for firmware interface such as UCSI, driver for
+USB PD controller or even driver for Thunderbolt3 controller. This document
+considers the component registering the USB Type-C ports with the class as "port
+driver".
+
+On top of showing the capabilities, the class also offer user space control over
+the roles and alternate modes of ports, partners and cable plugs when the port
+driver is capable of supporting those features.
+
+The class provides an API for the port drivers described in this document. The
+attributes are described in Documentation/ABI/testing/sysfs-class-typec.
+
+User space interface
+--------------------
+Every port will be presented as its own device under /sys/class/typec/. The
+first port will be named "port0", the second "port1" and so on.
+
+When connected, the partner will be presented also as its own device under
+/sys/class/typec/. The parent of the partner device will always be the port it
+is attached to. The partner attached to port "port0" will be named
+"port0-partner". Full path to the device would be
+/sys/class/typec/port0/port0-partner/.
+
+The cable and the two plugs on it may also be optionally presented as their own
+devices under /sys/class/typec/. The cable attached to the port "port0" port
+will be named port0-cable and the plug on the SOP Prime end (see USB Power
+Delivery Specification ch. 2.4) will be named "port0-plug0" and on the SOP
+Double Prime end "port0-plug1". The parent of a cable will always be the port,
+and the parent of the cable plugs will always be the cable.
+
+If the port, partner or cable plug supports Alternate Modes, every supported
+Alternate Mode SVID will have their own device describing them. Note that the
+Alternate Mode devices will not be attached to the typec class. The parent of an
+alternate mode will be the device that supports it, so for example an alternate
+mode of port0-partner will be presented under /sys/class/typec/port0-partner/.
+Every mode that is supported will have its own group under the Alternate Mode
+device named "mode<index>", for example /sys/class/typec/port0/<alternate
+mode>/mode1/. The requests for entering/exiting a mode can be done with "active"
+attribute file in that group.
+
+Driver API
+----------
+
+Registering the ports
+~~~~~~~~~~~~~~~~~~~~~
+
+The port drivers will describe every Type-C port they control with struct
+typec_capability data structure, and register them with the following API:
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_register_port typec_unregister_port
+
+When registering the ports, the prefer_role member in struct typec_capability
+deserves special notice. If the port that is being registered does not have
+initial role preference, which means the port does not execute Try.SNK or
+Try.SRC by default, the member must have value TYPEC_NO_PREFERRED_ROLE.
+Otherwise if the port executes Try.SNK by default, the member must have value
+TYPEC_DEVICE, and with Try.SRC the value must be TYPEC_HOST.
+
+Registering Partners
+~~~~~~~~~~~~~~~~~~~~
+
+After successful connection of a partner, the port driver needs to register the
+partner with the class. Details about the partner need to be described in struct
+typec_partner_desc. The class copies the details of the partner during
+registration. The class offers the following API for registering/unregistering
+partners.
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_register_partner typec_unregister_partner
+
+The class will provide a handle to struct typec_partner if the registration was
+successful, or NULL.
+
+If the partner is USB Power Delivery capable, and the port driver is able to
+show the result of Discover Identity command, the partner descriptor structure
+should include handle to struct usb_pd_identity instance. The class will then
+create a sysfs directory for the identity under the partner device. The result
+of Discover Identity command can then be reported with the following API:
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_partner_set_identity
+
+Registering Cables
+~~~~~~~~~~~~~~~~~~
+
+After successful connection of a cable that supports USB Power Delivery
+Structured VDM "Discover Identity", the port driver needs to register the cable
+and one or two plugs, depending if there is CC Double Prime controller present
+in the cable or not. So a cable capable of SOP Prime communication, but not SOP
+Double Prime communication, should only have one plug registered. For more
+information about SOP communication, please read chapter about it from the
+latest USB Power Delivery specification.
+
+The plugs are represented as their own devices. The cable is registered first,
+followed by registration of the cable plugs. The cable will be the parent device
+for the plugs. Details about the cable need to be described in struct
+typec_cable_desc and about a plug in struct typec_plug_desc. The class copies
+the details during registration. The class offers the following API for
+registering/unregistering cables and their plugs:
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_register_cable typec_unregister_cable typec_register_plug typec_unregister_plug
+
+The class will provide a handle to struct typec_cable and struct typec_plug if
+the registration is successful, or NULL if it isn't.
+
+If the cable is USB Power Delivery capable, and the port driver is able to show
+the result of Discover Identity command, the cable descriptor structure should
+include handle to struct usb_pd_identity instance. The class will then create a
+sysfs directory for the identity under the cable device. The result of Discover
+Identity command can then be reported with the following API:
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_cable_set_identity
+
+Notifications
+~~~~~~~~~~~~~
+
+When the partner has executed a role change, or when the default roles change
+during connection of a partner or cable, the port driver must use the following
+APIs to report it to the class:
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_set_data_role typec_set_pwr_role typec_set_vconn_role typec_set_pwr_opmode
+
+Alternate Modes
+~~~~~~~~~~~~~~~
+
+USB Type-C ports, partners and cable plugs may support Alternate Modes. Each
+Alternate Mode will have identifier called SVID, which is either a Standard ID
+given by USB-IF or vendor ID, and each supported SVID can have 1 - 6 modes. The
+class provides struct typec_mode_desc for describing individual mode of a SVID,
+and struct typec_altmode_desc which is a container for all the supported modes.
+
+Ports that support Alternate Modes need to register each SVID they support with
+the following API:
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_port_register_altmode
+
+If a partner or cable plug provides a list of SVIDs as response to USB Power
+Delivery Structured VDM Discover SVIDs message, each SVID needs to be
+registered.
+
+API for the partners:
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_partner_register_altmode
+
+API for the Cable Plugs:
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_plug_register_altmode
+
+So ports, partners and cable plugs will register the alternate modes with their
+own functions, but the registration will always return a handle to struct
+typec_altmode on success, or NULL. The unregistration will happen with the same
+function:
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_unregister_altmode
+
+If a partner or cable plug enters or exits a mode, the port driver needs to
+notify the class with the following API:
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_altmode_update_active
+
+Multiplexer/DeMultiplexer Switches
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+USB Type-C connectors may have one or more mux/demux switches behind them. Since
+the plugs can be inserted right-side-up or upside-down, a switch is needed to
+route the correct data pairs from the connector to the USB controllers. If
+Alternate or Accessory Modes are supported, another switch is needed that can
+route the pins on the connector to some other component besides USB. USB Type-C
+Connector Class supplies an API for registering those switches.
+
+.. kernel-doc:: drivers/usb/typec/mux.c
+ :functions: typec_switch_register typec_switch_unregister typec_mux_register typec_mux_unregister
+
+In most cases the same physical mux will handle both the orientation and mode.
+However, as the port drivers will be responsible for the orientation, and the
+alternate mode drivers for the mode, the two are always separated into their
+own logical components: "mux" for the mode and "switch" for the orientation.
+
+When a port is registered, USB Type-C Connector Class requests both the mux and
+the switch for the port. The drivers can then use the following API for
+controlling them:
+
+.. kernel-doc:: drivers/usb/typec/class.c
+ :functions: typec_set_orientation typec_set_mode
+
+If the connector is dual-role capable, there may also be a switch for the data
+role. USB Type-C Connector Class does not supply separate API for them. The
+port drivers can use USB Role Class API with those.
+
+Illustration of the muxes behind a connector that supports an alternate mode::
+
+ ------------------------
+ | Connector |
+ ------------------------
+ | |
+ ------------------------
+ \ Orientation /
+ --------------------
+ |
+ --------------------
+ / Mode \
+ ------------------------
+ / \
+ ------------------------ --------------------
+ | Alt Mode | / USB Role \
+ ------------------------ ------------------------
+ / \
+ ------------------------ ------------------------
+ | USB Host | | USB Device |
+ ------------------------ ------------------------
diff --git a/Documentation/driver-api/usb/typec_bus.rst b/Documentation/driver-api/usb/typec_bus.rst
new file mode 100644
index 0000000000..21c890ae17
--- /dev/null
+++ b/Documentation/driver-api/usb/typec_bus.rst
@@ -0,0 +1,122 @@
+
+API for USB Type-C Alternate Mode drivers
+=========================================
+
+Introduction
+------------
+
+Alternate modes require communication with the partner using Vendor Defined
+Messages (VDM) as defined in USB Type-C and USB Power Delivery Specifications.
+The communication is SVID (Standard or Vendor ID) specific, i.e. specific for
+every alternate mode, so every alternate mode will need a custom driver.
+
+USB Type-C bus allows binding a driver to the discovered partner alternate
+modes by using the SVID and the mode number.
+
+:ref:`USB Type-C Connector Class <typec>` provides a device for every alternate
+mode a port supports, and separate device for every alternate mode the partner
+supports. The drivers for the alternate modes are bound to the partner alternate
+mode devices, and the port alternate mode devices must be handled by the port
+drivers.
+
+When a new partner alternate mode device is registered, it is linked to the
+alternate mode device of the port that the partner is attached to, that has
+matching SVID and mode. Communication between the port driver and alternate mode
+driver will happen using the same API.
+
+The port alternate mode devices are used as a proxy between the partner and the
+alternate mode drivers, so the port drivers are only expected to pass the SVID
+specific commands from the alternate mode drivers to the partner, and from the
+partners to the alternate mode drivers. No direct SVID specific communication is
+needed from the port drivers, but the port drivers need to provide the operation
+callbacks for the port alternate mode devices, just like the alternate mode
+drivers need to provide them for the partner alternate mode devices.
+
+Usage:
+------
+
+General
+~~~~~~~
+
+By default, the alternate mode drivers are responsible for entering the mode.
+It is also possible to leave the decision about entering the mode to the user
+space (See Documentation/ABI/testing/sysfs-class-typec). Port drivers should not
+enter any modes on their own.
+
+``->vdm`` is the most important callback in the operation callbacks vector. It
+will be used to deliver all the SVID specific commands from the partner to the
+alternate mode driver, and vice versa in case of port drivers. The drivers send
+the SVID specific commands to each other using :c:func:`typec_altmode_vdm()`.
+
+If the communication with the partner using the SVID specific commands results
+in need to reconfigure the pins on the connector, the alternate mode driver
+needs to notify the bus using :c:func:`typec_altmode_notify()`. The driver
+passes the negotiated SVID specific pin configuration value to the function as
+parameter. The bus driver will then configure the mux behind the connector using
+that value as the state value for the mux.
+
+NOTE: The SVID specific pin configuration values must always start from
+``TYPEC_STATE_MODAL``. USB Type-C specification defines two default states for
+the connector: ``TYPEC_STATE_USB`` and ``TYPEC_STATE_SAFE``. These values are
+reserved by the bus as the first possible values for the state. When the
+alternate mode is entered, the bus will put the connector into
+``TYPEC_STATE_SAFE`` before sending Enter or Exit Mode command as defined in USB
+Type-C Specification, and also put the connector back to ``TYPEC_STATE_USB``
+after the mode has been exited.
+
+An example of working definitions for SVID specific pin configurations would
+look like this::
+
+ enum {
+ ALTMODEX_CONF_A = TYPEC_STATE_MODAL,
+ ALTMODEX_CONF_B,
+ ...
+ };
+
+Helper macro ``TYPEC_MODAL_STATE()`` can also be used::
+
+#define ALTMODEX_CONF_A = TYPEC_MODAL_STATE(0);
+#define ALTMODEX_CONF_B = TYPEC_MODAL_STATE(1);
+
+Cable plug alternate modes
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The alternate mode drivers are not bound to cable plug alternate mode devices,
+only to the partner alternate mode devices. If the alternate mode supports, or
+requires, a cable that responds to SOP Prime, and optionally SOP Double Prime
+messages, the driver for that alternate mode must request handle to the cable
+plug alternate modes using :c:func:`typec_altmode_get_plug()`, and take over
+their control.
+
+Driver API
+----------
+
+Alternate mode structs
+~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/linux/usb/typec_altmode.h
+ :functions: typec_altmode_driver typec_altmode_ops
+
+Alternate mode driver registering/unregistering
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/linux/usb/typec_altmode.h
+ :functions: typec_altmode_register_driver typec_altmode_unregister_driver
+
+Alternate mode driver operations
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/usb/typec/bus.c
+ :functions: typec_altmode_enter typec_altmode_exit typec_altmode_attention typec_altmode_vdm typec_altmode_notify
+
+API for the port drivers
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/usb/typec/bus.c
+ :functions: typec_match_altmode
+
+Cable Plug operations
+~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/usb/typec/bus.c
+ :functions: typec_altmode_get_plug typec_altmode_put_plug
diff --git a/Documentation/driver-api/usb/usb.rst b/Documentation/driver-api/usb/usb.rst
new file mode 100644
index 0000000000..fb41768696
--- /dev/null
+++ b/Documentation/driver-api/usb/usb.rst
@@ -0,0 +1,1056 @@
+.. _usb-hostside-api:
+
+===========================
+The Linux-USB Host Side API
+===========================
+
+Introduction to USB on Linux
+============================
+
+A Universal Serial Bus (USB) is used to connect a host, such as a PC or
+workstation, to a number of peripheral devices. USB uses a tree
+structure, with the host as the root (the system's master), hubs as
+interior nodes, and peripherals as leaves (and slaves). Modern PCs
+support several such trees of USB devices, usually
+a few USB 3.0 (5 GBit/s) or USB 3.1 (10 GBit/s) and some legacy
+USB 2.0 (480 MBit/s) busses just in case.
+
+That master/slave asymmetry was designed-in for a number of reasons, one
+being ease of use. It is not physically possible to mistake upstream and
+downstream or it does not matter with a type C plug (or they are built into the
+peripheral). Also, the host software doesn't need to deal with
+distributed auto-configuration since the pre-designated master node
+manages all that.
+
+Kernel developers added USB support to Linux early in the 2.2 kernel
+series and have been developing it further since then. Besides support
+for each new generation of USB, various host controllers gained support,
+new drivers for peripherals have been added and advanced features for latency
+measurement and improved power management introduced.
+
+Linux can run inside USB devices as well as on the hosts that control
+the devices. But USB device drivers running inside those peripherals
+don't do the same things as the ones running inside hosts, so they've
+been given a different name: *gadget drivers*. This document does not
+cover gadget drivers.
+
+USB Host-Side API Model
+=======================
+
+Host-side drivers for USB devices talk to the "usbcore" APIs. There are
+two. One is intended for *general-purpose* drivers (exposed through
+driver frameworks), and the other is for drivers that are *part of the
+core*. Such core drivers include the *hub* driver (which manages trees
+of USB devices) and several different kinds of *host controller
+drivers*, which control individual busses.
+
+The device model seen by USB drivers is relatively complex.
+
+- USB supports four kinds of data transfers (control, bulk, interrupt,
+ and isochronous). Two of them (control and bulk) use bandwidth as
+ it's available, while the other two (interrupt and isochronous) are
+ scheduled to provide guaranteed bandwidth.
+
+- The device description model includes one or more "configurations"
+ per device, only one of which is active at a time. Devices are supposed
+ to be capable of operating at lower than their top
+ speeds and may provide a BOS descriptor showing the lowest speed they
+ remain fully operational at.
+
+- From USB 3.0 on configurations have one or more "functions", which
+ provide a common functionality and are grouped together for purposes
+ of power management.
+
+- Configurations or functions have one or more "interfaces", each of which may have
+ "alternate settings". Interfaces may be standardized by USB "Class"
+ specifications, or may be specific to a vendor or device.
+
+ USB device drivers actually bind to interfaces, not devices. Think of
+ them as "interface drivers", though you may not see many devices
+ where the distinction is important. *Most USB devices are simple,
+ with only one function, one configuration, one interface, and one alternate
+ setting.*
+
+- Interfaces have one or more "endpoints", each of which supports one
+ type and direction of data transfer such as "bulk out" or "interrupt
+ in". The entire configuration may have up to sixteen endpoints in
+ each direction, allocated as needed among all the interfaces.
+
+- Data transfer on USB is packetized; each endpoint has a maximum
+ packet size. Drivers must often be aware of conventions such as
+ flagging the end of bulk transfers using "short" (including zero
+ length) packets.
+
+- The Linux USB API supports synchronous calls for control and bulk
+ messages. It also supports asynchronous calls for all kinds of data
+ transfer, using request structures called "URBs" (USB Request
+ Blocks).
+
+Accordingly, the USB Core API exposed to device drivers covers quite a
+lot of territory. You'll probably need to consult the USB 3.0
+specification, available online from www.usb.org at no cost, as well as
+class or device specifications.
+
+The only host-side drivers that actually touch hardware (reading/writing
+registers, handling IRQs, and so on) are the HCDs. In theory, all HCDs
+provide the same functionality through the same API. In practice, that's
+becoming more true, but there are still differences
+that crop up especially with fault handling on the less common controllers.
+Different controllers don't
+necessarily report the same aspects of failures, and recovery from
+faults (including software-induced ones like unlinking an URB) isn't yet
+fully consistent. Device driver authors should make a point of doing
+disconnect testing (while the device is active) with each different host
+controller driver, to make sure drivers don't have bugs of their own as
+well as to make sure they aren't relying on some HCD-specific behavior.
+
+.. _usb_chapter9:
+
+USB-Standard Types
+==================
+
+In ``include/uapi/linux/usb/ch9.h`` you will find the USB data types defined
+in chapter 9 of the USB specification. These data types are used throughout
+USB, and in APIs including this host side API, gadget APIs, usb character
+devices and debugfs interfaces. That file is itself included by
+``include/linux/usb/ch9.h``, which also contains declarations of a few
+utility routines for manipulating these data types; the implementations
+are in ``drivers/usb/common/common.c``.
+
+.. kernel-doc:: drivers/usb/common/common.c
+ :export:
+
+In addition, some functions useful for creating debugging output are
+defined in ``drivers/usb/common/debug.c``.
+
+.. _usb_header:
+
+Host-Side Data Types and Macros
+===============================
+
+The host side API exposes several layers to drivers, some of which are
+more necessary than others. These support lifecycle models for host side
+drivers and devices, and support passing buffers through usbcore to some
+HCD that performs the I/O for the device driver.
+
+.. kernel-doc:: include/linux/usb.h
+ :internal:
+
+USB Core APIs
+=============
+
+There are two basic I/O models in the USB API. The most elemental one is
+asynchronous: drivers submit requests in the form of an URB, and the
+URB's completion callback handles the next step. All USB transfer types
+support that model, although there are special cases for control URBs
+(which always have setup and status stages, but may not have a data
+stage) and isochronous URBs (which allow large packets and include
+per-packet fault reports). Built on top of that is synchronous API
+support, where a driver calls a routine that allocates one or more URBs,
+submits them, and waits until they complete. There are synchronous
+wrappers for single-buffer control and bulk transfers (which are awkward
+to use in some driver disconnect scenarios), and for scatterlist based
+streaming i/o (bulk or interrupt).
+
+USB drivers need to provide buffers that can be used for DMA, although
+they don't necessarily need to provide the DMA mapping themselves. There
+are APIs to use used when allocating DMA buffers, which can prevent use
+of bounce buffers on some systems. In some cases, drivers may be able to
+rely on 64bit DMA to eliminate another kind of bounce buffer.
+
+.. kernel-doc:: drivers/usb/core/urb.c
+ :export:
+
+.. kernel-doc:: drivers/usb/core/message.c
+ :export:
+
+.. kernel-doc:: drivers/usb/core/file.c
+ :export:
+
+.. kernel-doc:: drivers/usb/core/driver.c
+ :export:
+
+.. kernel-doc:: drivers/usb/core/usb.c
+ :export:
+
+.. kernel-doc:: drivers/usb/core/hub.c
+ :export:
+
+Host Controller APIs
+====================
+
+These APIs are only for use by host controller drivers, most of which
+implement standard register interfaces such as XHCI, EHCI, OHCI, or UHCI. UHCI
+was one of the first interfaces, designed by Intel and also used by VIA;
+it doesn't do much in hardware. OHCI was designed later, to have the
+hardware do more work (bigger transfers, tracking protocol state, and so
+on). EHCI was designed with USB 2.0; its design has features that
+resemble OHCI (hardware does much more work) as well as UHCI (some parts
+of ISO support, TD list processing). XHCI was designed with USB 3.0. It
+continues to shift support for functionality into hardware.
+
+There are host controllers other than the "big three", although most PCI
+based controllers (and a few non-PCI based ones) use one of those
+interfaces. Not all host controllers use DMA; some use PIO, and there is
+also a simulator and a virtual host controller to pipe USB over the network.
+
+The same basic APIs are available to drivers for all those controllers.
+For historical reasons they are in two layers: :c:type:`struct
+usb_bus <usb_bus>` is a rather thin layer that became available
+in the 2.2 kernels, while :c:type:`struct usb_hcd <usb_hcd>`
+is a more featureful layer
+that lets HCDs share common code, to shrink driver size and
+significantly reduce hcd-specific behaviors.
+
+.. kernel-doc:: drivers/usb/core/hcd.c
+ :export:
+
+.. kernel-doc:: drivers/usb/core/hcd-pci.c
+ :export:
+
+.. kernel-doc:: drivers/usb/core/buffer.c
+ :internal:
+
+The USB character device nodes
+==============================
+
+This chapter presents the Linux character device nodes. You may prefer
+to avoid writing new kernel code for your USB driver. User mode device
+drivers are usually packaged as applications or libraries, and may use
+character devices through some programming library that wraps it.
+Such libraries include:
+
+ - `libusb <http://libusb.sourceforge.net>`__ for C/C++, and
+ - `jUSB <http://jUSB.sourceforge.net>`__ for Java.
+
+Some old information about it can be seen at the "USB Device Filesystem"
+section of the USB Guide. The latest copy of the USB Guide can be found
+at http://www.linux-usb.org/
+
+.. note::
+
+ - They were used to be implemented via *usbfs*, but this is not part of
+ the sysfs debug interface.
+
+ - This particular documentation is incomplete, especially with respect
+ to the asynchronous mode. As of kernel 2.5.66 the code and this
+ (new) documentation need to be cross-reviewed.
+
+What files are in "devtmpfs"?
+-----------------------------
+
+Conventionally mounted at ``/dev/bus/usb/``, usbfs features include:
+
+- ``/dev/bus/usb/BBB/DDD`` ... magic files exposing the each device's
+ configuration descriptors, and supporting a series of ioctls for
+ making device requests, including I/O to devices. (Purely for access
+ by programs.)
+
+Each bus is given a number (``BBB``) based on when it was enumerated; within
+each bus, each device is given a similar number (``DDD``). Those ``BBB/DDD``
+paths are not "stable" identifiers; expect them to change even if you
+always leave the devices plugged in to the same hub port. *Don't even
+think of saving these in application configuration files.* Stable
+identifiers are available, for user mode applications that want to use
+them. HID and networking devices expose these stable IDs, so that for
+example you can be sure that you told the right UPS to power down its
+second server. Pleast note that it doesn't (yet) expose those IDs.
+
+/dev/bus/usb/BBB/DDD
+--------------------
+
+Use these files in one of these basic ways:
+
+- *They can be read,* producing first the device descriptor (18 bytes) and
+ then the descriptors for the current configuration. See the USB 2.0 spec
+ for details about those binary data formats. You'll need to convert most
+ multibyte values from little endian format to your native host byte
+ order, although a few of the fields in the device descriptor (both of
+ the BCD-encoded fields, and the vendor and product IDs) will be
+ byteswapped for you. Note that configuration descriptors include
+ descriptors for interfaces, altsettings, endpoints, and maybe additional
+ class descriptors.
+
+- *Perform USB operations* using *ioctl()* requests to make endpoint I/O
+ requests (synchronously or asynchronously) or manage the device. These
+ requests need the ``CAP_SYS_RAWIO`` capability, as well as filesystem
+ access permissions. Only one ioctl request can be made on one of these
+ device files at a time. This means that if you are synchronously reading
+ an endpoint from one thread, you won't be able to write to a different
+ endpoint from another thread until the read completes. This works for
+ *half duplex* protocols, but otherwise you'd use asynchronous i/o
+ requests.
+
+Each connected USB device has one file. The ``BBB`` indicates the bus
+number. The ``DDD`` indicates the device address on that bus. Both
+of these numbers are assigned sequentially, and can be reused, so
+you can't rely on them for stable access to devices. For example,
+it's relatively common for devices to re-enumerate while they are
+still connected (perhaps someone jostled their power supply, hub,
+or USB cable), so a device might be ``002/027`` when you first connect
+it and ``002/048`` sometime later.
+
+These files can be read as binary data. The binary data consists
+of first the device descriptor, then the descriptors for each
+configuration of the device. Multi-byte fields in the device descriptor
+are converted to host endianness by the kernel. The configuration
+descriptors are in bus endian format! The configuration descriptor
+are wTotalLength bytes apart. If a device returns less configuration
+descriptor data than indicated by wTotalLength there will be a hole in
+the file for the missing bytes. This information is also shown
+in text form by the ``/sys/kernel/debug/usb/devices`` file, described later.
+
+These files may also be used to write user-level drivers for the USB
+devices. You would open the ``/dev/bus/usb/BBB/DDD`` file read/write,
+read its descriptors to make sure it's the device you expect, and then
+bind to an interface (or perhaps several) using an ioctl call. You
+would issue more ioctls to the device to communicate to it using
+control, bulk, or other kinds of USB transfers. The IOCTLs are
+listed in the ``<linux/usbdevice_fs.h>`` file, and at this writing the
+source code (``linux/drivers/usb/core/devio.c``) is the primary reference
+for how to access devices through those files.
+
+Note that since by default these ``BBB/DDD`` files are writable only by
+root, only root can write such user mode drivers. You can selectively
+grant read/write permissions to other users by using ``chmod``. Also,
+usbfs mount options such as ``devmode=0666`` may be helpful.
+
+
+Life Cycle of User Mode Drivers
+-------------------------------
+
+Such a driver first needs to find a device file for a device it knows
+how to handle. Maybe it was told about it because a ``/sbin/hotplug``
+event handling agent chose that driver to handle the new device. Or
+maybe it's an application that scans all the ``/dev/bus/usb`` device files,
+and ignores most devices. In either case, it should :c:func:`read()`
+all the descriptors from the device file, and check them against what it
+knows how to handle. It might just reject everything except a particular
+vendor and product ID, or need a more complex policy.
+
+Never assume there will only be one such device on the system at a time!
+If your code can't handle more than one device at a time, at least
+detect when there's more than one, and have your users choose which
+device to use.
+
+Once your user mode driver knows what device to use, it interacts with
+it in either of two styles. The simple style is to make only control
+requests; some devices don't need more complex interactions than those.
+(An example might be software using vendor-specific control requests for
+some initialization or configuration tasks, with a kernel driver for the
+rest.)
+
+More likely, you need a more complex style driver: one using non-control
+endpoints, reading or writing data and claiming exclusive use of an
+interface. *Bulk* transfers are easiest to use, but only their sibling
+*interrupt* transfers work with low speed devices. Both interrupt and
+*isochronous* transfers offer service guarantees because their bandwidth
+is reserved. Such "periodic" transfers are awkward to use through usbfs,
+unless you're using the asynchronous calls. However, interrupt transfers
+can also be used in a synchronous "one shot" style.
+
+Your user-mode driver should never need to worry about cleaning up
+request state when the device is disconnected, although it should close
+its open file descriptors as soon as it starts seeing the ENODEV errors.
+
+The ioctl() Requests
+--------------------
+
+To use these ioctls, you need to include the following headers in your
+userspace program::
+
+ #include <linux/usb.h>
+ #include <linux/usbdevice_fs.h>
+ #include <asm/byteorder.h>
+
+The standard USB device model requests, from "Chapter 9" of the USB 2.0
+specification, are automatically included from the ``<linux/usb/ch9.h>``
+header.
+
+Unless noted otherwise, the ioctl requests described here will update
+the modification time on the usbfs file to which they are applied
+(unless they fail). A return of zero indicates success; otherwise, a
+standard USB error code is returned (These are documented in
+:ref:`usb-error-codes`).
+
+Each of these files multiplexes access to several I/O streams, one per
+endpoint. Each device has one control endpoint (endpoint zero) which
+supports a limited RPC style RPC access. Devices are configured by
+hub_wq (in the kernel) setting a device-wide *configuration* that
+affects things like power consumption and basic functionality. The
+endpoints are part of USB *interfaces*, which may have *altsettings*
+affecting things like which endpoints are available. Many devices only
+have a single configuration and interface, so drivers for them will
+ignore configurations and altsettings.
+
+Management/Status Requests
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+A number of usbfs requests don't deal very directly with device I/O.
+They mostly relate to device management and status. These are all
+synchronous requests.
+
+USBDEVFS_CLAIMINTERFACE
+ This is used to force usbfs to claim a specific interface, which has
+ not previously been claimed by usbfs or any other kernel driver. The
+ ioctl parameter is an integer holding the number of the interface
+ (bInterfaceNumber from descriptor).
+
+ Note that if your driver doesn't claim an interface before trying to
+ use one of its endpoints, and no other driver has bound to it, then
+ the interface is automatically claimed by usbfs.
+
+ This claim will be released by a RELEASEINTERFACE ioctl, or by
+ closing the file descriptor. File modification time is not updated
+ by this request.
+
+USBDEVFS_CONNECTINFO
+ Says whether the device is lowspeed. The ioctl parameter points to a
+ structure like this::
+
+ struct usbdevfs_connectinfo {
+ unsigned int devnum;
+ unsigned char slow;
+ };
+
+ File modification time is not updated by this request.
+
+ *You can't tell whether a "not slow" device is connected at high
+ speed (480 MBit/sec) or just full speed (12 MBit/sec).* You should
+ know the devnum value already, it's the DDD value of the device file
+ name.
+
+USBDEVFS_GET_SPEED
+ Returns the speed of the device. The speed is returned as a
+ nummerical value in accordance with enum usb_device_speed
+
+ File modification time is not updated by this request.
+
+USBDEVFS_GETDRIVER
+ Returns the name of the kernel driver bound to a given interface (a
+ string). Parameter is a pointer to this structure, which is
+ modified::
+
+ struct usbdevfs_getdriver {
+ unsigned int interface;
+ char driver[USBDEVFS_MAXDRIVERNAME + 1];
+ };
+
+ File modification time is not updated by this request.
+
+USBDEVFS_IOCTL
+ Passes a request from userspace through to a kernel driver that has
+ an ioctl entry in the *struct usb_driver* it registered::
+
+ struct usbdevfs_ioctl {
+ int ifno;
+ int ioctl_code;
+ void *data;
+ };
+
+ /* user mode call looks like this.
+ * 'request' becomes the driver->ioctl() 'code' parameter.
+ * the size of 'param' is encoded in 'request', and that data
+ * is copied to or from the driver->ioctl() 'buf' parameter.
+ */
+ static int
+ usbdev_ioctl (int fd, int ifno, unsigned request, void *param)
+ {
+ struct usbdevfs_ioctl wrapper;
+
+ wrapper.ifno = ifno;
+ wrapper.ioctl_code = request;
+ wrapper.data = param;
+
+ return ioctl (fd, USBDEVFS_IOCTL, &wrapper);
+ }
+
+ File modification time is not updated by this request.
+
+ This request lets kernel drivers talk to user mode code through
+ filesystem operations even when they don't create a character or
+ block special device. It's also been used to do things like ask
+ devices what device special file should be used. Two pre-defined
+ ioctls are used to disconnect and reconnect kernel drivers, so that
+ user mode code can completely manage binding and configuration of
+ devices.
+
+USBDEVFS_RELEASEINTERFACE
+ This is used to release the claim usbfs made on interface, either
+ implicitly or because of a USBDEVFS_CLAIMINTERFACE call, before the
+ file descriptor is closed. The ioctl parameter is an integer holding
+ the number of the interface (bInterfaceNumber from descriptor); File
+ modification time is not updated by this request.
+
+ .. warning::
+
+ *No security check is made to ensure that the task which made
+ the claim is the one which is releasing it. This means that user
+ mode driver may interfere other ones.*
+
+USBDEVFS_RESETEP
+ Resets the data toggle value for an endpoint (bulk or interrupt) to
+ DATA0. The ioctl parameter is an integer endpoint number (1 to 15,
+ as identified in the endpoint descriptor), with USB_DIR_IN added
+ if the device's endpoint sends data to the host.
+
+ .. Warning::
+
+ *Avoid using this request. It should probably be removed.* Using
+ it typically means the device and driver will lose toggle
+ synchronization. If you really lost synchronization, you likely
+ need to completely handshake with the device, using a request
+ like CLEAR_HALT or SET_INTERFACE.
+
+USBDEVFS_DROP_PRIVILEGES
+ This is used to relinquish the ability to do certain operations
+ which are considered to be privileged on a usbfs file descriptor.
+ This includes claiming arbitrary interfaces, resetting a device on
+ which there are currently claimed interfaces from other users, and
+ issuing USBDEVFS_IOCTL calls. The ioctl parameter is a 32 bit mask
+ of interfaces the user is allowed to claim on this file descriptor.
+ You may issue this ioctl more than one time to narrow said mask.
+
+Synchronous I/O Support
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Synchronous requests involve the kernel blocking until the user mode
+request completes, either by finishing successfully or by reporting an
+error. In most cases this is the simplest way to use usbfs, although as
+noted above it does prevent performing I/O to more than one endpoint at
+a time.
+
+USBDEVFS_BULK
+ Issues a bulk read or write request to the device. The ioctl
+ parameter is a pointer to this structure::
+
+ struct usbdevfs_bulktransfer {
+ unsigned int ep;
+ unsigned int len;
+ unsigned int timeout; /* in milliseconds */
+ void *data;
+ };
+
+ The ``ep`` value identifies a bulk endpoint number (1 to 15, as
+ identified in an endpoint descriptor), masked with USB_DIR_IN when
+ referring to an endpoint which sends data to the host from the
+ device. The length of the data buffer is identified by ``len``; Recent
+ kernels support requests up to about 128KBytes. *FIXME say how read
+ length is returned, and how short reads are handled.*.
+
+USBDEVFS_CLEAR_HALT
+ Clears endpoint halt (stall) and resets the endpoint toggle. This is
+ only meaningful for bulk or interrupt endpoints. The ioctl parameter
+ is an integer endpoint number (1 to 15, as identified in an endpoint
+ descriptor), masked with USB_DIR_IN when referring to an endpoint
+ which sends data to the host from the device.
+
+ Use this on bulk or interrupt endpoints which have stalled,
+ returning ``-EPIPE`` status to a data transfer request. Do not issue
+ the control request directly, since that could invalidate the host's
+ record of the data toggle.
+
+USBDEVFS_CONTROL
+ Issues a control request to the device. The ioctl parameter points
+ to a structure like this::
+
+ struct usbdevfs_ctrltransfer {
+ __u8 bRequestType;
+ __u8 bRequest;
+ __u16 wValue;
+ __u16 wIndex;
+ __u16 wLength;
+ __u32 timeout; /* in milliseconds */
+ void *data;
+ };
+
+ The first eight bytes of this structure are the contents of the
+ SETUP packet to be sent to the device; see the USB 2.0 specification
+ for details. The bRequestType value is composed by combining a
+ ``USB_TYPE_*`` value, a ``USB_DIR_*`` value, and a ``USB_RECIP_*``
+ value (from ``linux/usb.h``). If wLength is nonzero, it describes
+ the length of the data buffer, which is either written to the device
+ (USB_DIR_OUT) or read from the device (USB_DIR_IN).
+
+ At this writing, you can't transfer more than 4 KBytes of data to or
+ from a device; usbfs has a limit, and some host controller drivers
+ have a limit. (That's not usually a problem.) *Also* there's no way
+ to say it's not OK to get a short read back from the device.
+
+USBDEVFS_RESET
+ Does a USB level device reset. The ioctl parameter is ignored. After
+ the reset, this rebinds all device interfaces. File modification
+ time is not updated by this request.
+
+.. warning::
+
+ *Avoid using this call* until some usbcore bugs get fixed, since
+ it does not fully synchronize device, interface, and driver (not
+ just usbfs) state.
+
+USBDEVFS_SETINTERFACE
+ Sets the alternate setting for an interface. The ioctl parameter is
+ a pointer to a structure like this::
+
+ struct usbdevfs_setinterface {
+ unsigned int interface;
+ unsigned int altsetting;
+ };
+
+ File modification time is not updated by this request.
+
+ Those struct members are from some interface descriptor applying to
+ the current configuration. The interface number is the
+ bInterfaceNumber value, and the altsetting number is the
+ bAlternateSetting value. (This resets each endpoint in the
+ interface.)
+
+USBDEVFS_SETCONFIGURATION
+ Issues the :c:func:`usb_set_configuration()` call for the
+ device. The parameter is an integer holding the number of a
+ configuration (bConfigurationValue from descriptor). File
+ modification time is not updated by this request.
+
+.. warning::
+
+ *Avoid using this call* until some usbcore bugs get fixed, since
+ it does not fully synchronize device, interface, and driver (not
+ just usbfs) state.
+
+Asynchronous I/O Support
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+As mentioned above, there are situations where it may be important to
+initiate concurrent operations from user mode code. This is particularly
+important for periodic transfers (interrupt and isochronous), but it can
+be used for other kinds of USB requests too. In such cases, the
+asynchronous requests described here are essential. Rather than
+submitting one request and having the kernel block until it completes,
+the blocking is separate.
+
+These requests are packaged into a structure that resembles the URB used
+by kernel device drivers. (No POSIX Async I/O support here, sorry.) It
+identifies the endpoint type (``USBDEVFS_URB_TYPE_*``), endpoint
+(number, masked with USB_DIR_IN as appropriate), buffer and length,
+and a user "context" value serving to uniquely identify each request.
+(It's usually a pointer to per-request data.) Flags can modify requests
+(not as many as supported for kernel drivers).
+
+Each request can specify a realtime signal number (between SIGRTMIN and
+SIGRTMAX, inclusive) to request a signal be sent when the request
+completes.
+
+When usbfs returns these urbs, the status value is updated, and the
+buffer may have been modified. Except for isochronous transfers, the
+actual_length is updated to say how many bytes were transferred; if the
+USBDEVFS_URB_DISABLE_SPD flag is set ("short packets are not OK"), if
+fewer bytes were read than were requested then you get an error report::
+
+ struct usbdevfs_iso_packet_desc {
+ unsigned int length;
+ unsigned int actual_length;
+ unsigned int status;
+ };
+
+ struct usbdevfs_urb {
+ unsigned char type;
+ unsigned char endpoint;
+ int status;
+ unsigned int flags;
+ void *buffer;
+ int buffer_length;
+ int actual_length;
+ int start_frame;
+ int number_of_packets;
+ int error_count;
+ unsigned int signr;
+ void *usercontext;
+ struct usbdevfs_iso_packet_desc iso_frame_desc[];
+ };
+
+For these asynchronous requests, the file modification time reflects
+when the request was initiated. This contrasts with their use with the
+synchronous requests, where it reflects when requests complete.
+
+USBDEVFS_DISCARDURB
+ *TBS* File modification time is not updated by this request.
+
+USBDEVFS_DISCSIGNAL
+ *TBS* File modification time is not updated by this request.
+
+USBDEVFS_REAPURB
+ *TBS* File modification time is not updated by this request.
+
+USBDEVFS_REAPURBNDELAY
+ *TBS* File modification time is not updated by this request.
+
+USBDEVFS_SUBMITURB
+ *TBS*
+
+The USB devices
+===============
+
+The USB devices are now exported via debugfs:
+
+- ``/sys/kernel/debug/usb/devices`` ... a text file showing each of the USB
+ devices on known to the kernel, and their configuration descriptors.
+ You can also poll() this to learn about new devices.
+
+/sys/kernel/debug/usb/devices
+-----------------------------
+
+This file is handy for status viewing tools in user mode, which can scan
+the text format and ignore most of it. More detailed device status
+(including class and vendor status) is available from device-specific
+files. For information about the current format of this file, see below.
+
+This file, in combination with the poll() system call, can also be used
+to detect when devices are added or removed::
+
+ int fd;
+ struct pollfd pfd;
+
+ fd = open("/sys/kernel/debug/usb/devices", O_RDONLY);
+ pfd = { fd, POLLIN, 0 };
+ for (;;) {
+ /* The first time through, this call will return immediately. */
+ poll(&pfd, 1, -1);
+
+ /* To see what's changed, compare the file's previous and current
+ contents or scan the filesystem. (Scanning is more precise.) */
+ }
+
+Note that this behavior is intended to be used for informational and
+debug purposes. It would be more appropriate to use programs such as
+udev or HAL to initialize a device or start a user-mode helper program,
+for instance.
+
+In this file, each device's output has multiple lines of ASCII output.
+
+I made it ASCII instead of binary on purpose, so that someone
+can obtain some useful data from it without the use of an
+auxiliary program. However, with an auxiliary program, the numbers
+in the first 4 columns of each ``T:`` line (topology info:
+Lev, Prnt, Port, Cnt) can be used to build a USB topology diagram.
+
+Each line is tagged with a one-character ID for that line::
+
+ T = Topology (etc.)
+ B = Bandwidth (applies only to USB host controllers, which are
+ virtualized as root hubs)
+ D = Device descriptor info.
+ P = Product ID info. (from Device descriptor, but they won't fit
+ together on one line)
+ S = String descriptors.
+ C = Configuration descriptor info. (* = active configuration)
+ I = Interface descriptor info.
+ E = Endpoint descriptor info.
+
+/sys/kernel/debug/usb/devices output format
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Legend::
+ d = decimal number (may have leading spaces or 0's)
+ x = hexadecimal number (may have leading spaces or 0's)
+ s = string
+
+
+
+Topology info
+^^^^^^^^^^^^^
+
+::
+
+ T: Bus=dd Lev=dd Prnt=dd Port=dd Cnt=dd Dev#=ddd Spd=dddd MxCh=dd
+ | | | | | | | | |__MaxChildren
+ | | | | | | | |__Device Speed in Mbps
+ | | | | | | |__DeviceNumber
+ | | | | | |__Count of devices at this level
+ | | | | |__Connector/Port on Parent for this device
+ | | | |__Parent DeviceNumber
+ | | |__Level in topology for this bus
+ | |__Bus number
+ |__Topology info tag
+
+Speed may be:
+
+ ======= ======================================================
+ 1.5 Mbit/s for low speed USB
+ 12 Mbit/s for full speed USB
+ 480 Mbit/s for high speed USB (added for USB 2.0)
+ 5000 Mbit/s for SuperSpeed USB (added for USB 3.0)
+ ======= ======================================================
+
+For reasons lost in the mists of time, the Port number is always
+too low by 1. For example, a device plugged into port 4 will
+show up with ``Port=03``.
+
+Bandwidth info
+^^^^^^^^^^^^^^
+
+::
+
+ B: Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd
+ | | | |__Number of isochronous requests
+ | | |__Number of interrupt requests
+ | |__Total Bandwidth allocated to this bus
+ |__Bandwidth info tag
+
+Bandwidth allocation is an approximation of how much of one frame
+(millisecond) is in use. It reflects only periodic transfers, which
+are the only transfers that reserve bandwidth. Control and bulk
+transfers use all other bandwidth, including reserved bandwidth that
+is not used for transfers (such as for short packets).
+
+The percentage is how much of the "reserved" bandwidth is scheduled by
+those transfers. For a low or full speed bus (loosely, "USB 1.1"),
+90% of the bus bandwidth is reserved. For a high speed bus (loosely,
+"USB 2.0") 80% is reserved.
+
+
+Device descriptor info & Product ID info
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+::
+
+ D: Ver=x.xx Cls=xx(s) Sub=xx Prot=xx MxPS=dd #Cfgs=dd
+ P: Vendor=xxxx ProdID=xxxx Rev=xx.xx
+
+where::
+
+ D: Ver=x.xx Cls=xx(sssss) Sub=xx Prot=xx MxPS=dd #Cfgs=dd
+ | | | | | | |__NumberConfigurations
+ | | | | | |__MaxPacketSize of Default Endpoint
+ | | | | |__DeviceProtocol
+ | | | |__DeviceSubClass
+ | | |__DeviceClass
+ | |__Device USB version
+ |__Device info tag #1
+
+where::
+
+ P: Vendor=xxxx ProdID=xxxx Rev=xx.xx
+ | | | |__Product revision number
+ | | |__Product ID code
+ | |__Vendor ID code
+ |__Device info tag #2
+
+
+String descriptor info
+^^^^^^^^^^^^^^^^^^^^^^
+::
+
+ S: Manufacturer=ssss
+ | |__Manufacturer of this device as read from the device.
+ | For USB host controller drivers (virtual root hubs) this may
+ | be omitted, or (for newer drivers) will identify the kernel
+ | version and the driver which provides this hub emulation.
+ |__String info tag
+
+ S: Product=ssss
+ | |__Product description of this device as read from the device.
+ | For older USB host controller drivers (virtual root hubs) this
+ | indicates the driver; for newer ones, it's a product (and vendor)
+ | description that often comes from the kernel's PCI ID database.
+ |__String info tag
+
+ S: SerialNumber=ssss
+ | |__Serial Number of this device as read from the device.
+ | For USB host controller drivers (virtual root hubs) this is
+ | some unique ID, normally a bus ID (address or slot name) that
+ | can't be shared with any other device.
+ |__String info tag
+
+
+
+Configuration descriptor info
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+::
+
+ C:* #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA
+ | | | | | |__MaxPower in mA
+ | | | | |__Attributes
+ | | | |__ConfiguratioNumber
+ | | |__NumberOfInterfaces
+ | |__ "*" indicates the active configuration (others are " ")
+ |__Config info tag
+
+USB devices may have multiple configurations, each of which act
+rather differently. For example, a bus-powered configuration
+might be much less capable than one that is self-powered. Only
+one device configuration can be active at a time; most devices
+have only one configuration.
+
+Each configuration consists of one or more interfaces. Each
+interface serves a distinct "function", which is typically bound
+to a different USB device driver. One common example is a USB
+speaker with an audio interface for playback, and a HID interface
+for use with software volume control.
+
+Interface descriptor info (can be multiple per Config)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+::
+
+ I:* If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=ssss
+ | | | | | | | | |__Driver name
+ | | | | | | | | or "(none)"
+ | | | | | | | |__InterfaceProtocol
+ | | | | | | |__InterfaceSubClass
+ | | | | | |__InterfaceClass
+ | | | | |__NumberOfEndpoints
+ | | | |__AlternateSettingNumber
+ | | |__InterfaceNumber
+ | |__ "*" indicates the active altsetting (others are " ")
+ |__Interface info tag
+
+A given interface may have one or more "alternate" settings.
+For example, default settings may not use more than a small
+amount of periodic bandwidth. To use significant fractions
+of bus bandwidth, drivers must select a non-default altsetting.
+
+Only one setting for an interface may be active at a time, and
+only one driver may bind to an interface at a time. Most devices
+have only one alternate setting per interface.
+
+
+Endpoint descriptor info (can be multiple per Interface)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+::
+
+ E: Ad=xx(s) Atr=xx(ssss) MxPS=dddd Ivl=dddss
+ | | | | |__Interval (max) between transfers
+ | | | |__EndpointMaxPacketSize
+ | | |__Attributes(EndpointType)
+ | |__EndpointAddress(I=In,O=Out)
+ |__Endpoint info tag
+
+The interval is nonzero for all periodic (interrupt or isochronous)
+endpoints. For high speed endpoints the transfer interval may be
+measured in microseconds rather than milliseconds.
+
+For high speed periodic endpoints, the ``EndpointMaxPacketSize`` reflects
+the per-microframe data transfer size. For "high bandwidth"
+endpoints, that can reflect two or three packets (for up to
+3KBytes every 125 usec) per endpoint.
+
+With the Linux-USB stack, periodic bandwidth reservations use the
+transfer intervals and sizes provided by URBs, which can be less
+than those found in endpoint descriptor.
+
+Usage examples
+~~~~~~~~~~~~~~
+
+If a user or script is interested only in Topology info, for
+example, use something like ``grep ^T: /sys/kernel/debug/usb/devices``
+for only the Topology lines. A command like
+``grep -i ^[tdp]: /sys/kernel/debug/usb/devices`` can be used to list
+only the lines that begin with the characters in square brackets,
+where the valid characters are TDPCIE. With a slightly more able
+script, it can display any selected lines (for example, only T, D,
+and P lines) and change their output format. (The ``procusb``
+Perl script is the beginning of this idea. It will list only
+selected lines [selected from TBDPSCIE] or "All" lines from
+``/sys/kernel/debug/usb/devices``.)
+
+The Topology lines can be used to generate a graphic/pictorial
+of the USB devices on a system's root hub. (See more below
+on how to do this.)
+
+The Interface lines can be used to determine what driver is
+being used for each device, and which altsetting it activated.
+
+The Configuration lines could be used to list maximum power
+(in milliamps) that a system's USB devices are using.
+For example, ``grep ^C: /sys/kernel/debug/usb/devices``.
+
+
+Here's an example, from a system which has a UHCI root hub,
+an external hub connected to the root hub, and a mouse and
+a serial converter connected to the external hub.
+
+::
+
+ T: Bus=00 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
+ B: Alloc= 28/900 us ( 3%), #Int= 2, #Iso= 0
+ D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
+ P: Vendor=0000 ProdID=0000 Rev= 0.00
+ S: Product=USB UHCI Root Hub
+ S: SerialNumber=dce0
+ C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
+ I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
+ E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms
+
+ T: Bus=00 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 4
+ D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
+ P: Vendor=0451 ProdID=1446 Rev= 1.00
+ C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
+ I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
+ E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=255ms
+
+ T: Bus=00 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#= 3 Spd=1.5 MxCh= 0
+ D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
+ P: Vendor=04b4 ProdID=0001 Rev= 0.00
+ C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
+ I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=mouse
+ E: Ad=81(I) Atr=03(Int.) MxPS= 3 Ivl= 10ms
+
+ T: Bus=00 Lev=02 Prnt=02 Port=02 Cnt=02 Dev#= 4 Spd=12 MxCh= 0
+ D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
+ P: Vendor=0565 ProdID=0001 Rev= 1.08
+ S: Manufacturer=Peracom Networks, Inc.
+ S: Product=Peracom USB to Serial Converter
+ C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
+ I: If#= 0 Alt= 0 #EPs= 3 Cls=00(>ifc ) Sub=00 Prot=00 Driver=serial
+ E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl= 16ms
+ E: Ad=01(O) Atr=02(Bulk) MxPS= 16 Ivl= 16ms
+ E: Ad=82(I) Atr=03(Int.) MxPS= 8 Ivl= 8ms
+
+
+Selecting only the ``T:`` and ``I:`` lines from this (for example, by using
+``procusb ti``), we have
+
+::
+
+ T: Bus=00 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
+ T: Bus=00 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 4
+ I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
+ T: Bus=00 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#= 3 Spd=1.5 MxCh= 0
+ I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=mouse
+ T: Bus=00 Lev=02 Prnt=02 Port=02 Cnt=02 Dev#= 4 Spd=12 MxCh= 0
+ I: If#= 0 Alt= 0 #EPs= 3 Cls=00(>ifc ) Sub=00 Prot=00 Driver=serial
+
+
+Physically this looks like (or could be converted to)::
+
+ +------------------+
+ | PC/root_hub (12)| Dev# = 1
+ +------------------+ (nn) is Mbps.
+ Level 0 | CN.0 | CN.1 | [CN = connector/port #]
+ +------------------+
+ /
+ /
+ +-----------------------+
+ Level 1 | Dev#2: 4-port hub (12)|
+ +-----------------------+
+ |CN.0 |CN.1 |CN.2 |CN.3 |
+ +-----------------------+
+ \ \____________________
+ \_____ \
+ \ \
+ +--------------------+ +--------------------+
+ Level 2 | Dev# 3: mouse (1.5)| | Dev# 4: serial (12)|
+ +--------------------+ +--------------------+
+
+
+
+Or, in a more tree-like structure (ports [Connectors] without
+connections could be omitted)::
+
+ PC: Dev# 1, root hub, 2 ports, 12 Mbps
+ |_ CN.0: Dev# 2, hub, 4 ports, 12 Mbps
+ |_ CN.0: Dev #3, mouse, 1.5 Mbps
+ |_ CN.1:
+ |_ CN.2: Dev #4, serial, 12 Mbps
+ |_ CN.3:
+ |_ CN.1:
diff --git a/Documentation/driver-api/usb/usb3-debug-port.rst b/Documentation/driver-api/usb/usb3-debug-port.rst
new file mode 100644
index 0000000000..d4610457b0
--- /dev/null
+++ b/Documentation/driver-api/usb/usb3-debug-port.rst
@@ -0,0 +1,152 @@
+===============
+USB3 debug port
+===============
+
+:Author: Lu Baolu <baolu.lu@linux.intel.com>
+:Date: March 2017
+
+GENERAL
+=======
+
+This is a HOWTO for using the USB3 debug port on x86 systems.
+
+Before using any kernel debugging functionality based on USB3
+debug port, you need to::
+
+ 1) check whether any USB3 debug port is available in
+ your system;
+ 2) check which port is used for debugging purposes;
+ 3) have a USB 3.0 super-speed A-to-A debugging cable.
+
+INTRODUCTION
+============
+
+The xHCI debug capability (DbC) is an optional but standalone
+functionality provided by the xHCI host controller. The xHCI
+specification describes DbC in the section 7.6.
+
+When DbC is initialized and enabled, it will present a debug
+device through the debug port (normally the first USB3
+super-speed port). The debug device is fully compliant with
+the USB framework and provides the equivalent of a very high
+performance full-duplex serial link between the debug target
+(the system under debugging) and a debug host.
+
+EARLY PRINTK
+============
+
+DbC has been designed to log early printk messages. One use for
+this feature is kernel debugging. For example, when your machine
+crashes very early before the regular console code is initialized.
+Other uses include simpler, lockless logging instead of a full-
+blown printk console driver and klogd.
+
+On the debug target system, you need to customize a debugging
+kernel with CONFIG_EARLY_PRINTK_USB_XDBC enabled. And, add below
+kernel boot parameter::
+
+ "earlyprintk=xdbc"
+
+If there are multiple xHCI controllers in your system, you can
+append a host controller index to this kernel parameter. This
+index starts from 0.
+
+Current design doesn't support DbC runtime suspend/resume. As
+the result, you'd better disable runtime power management for
+USB subsystem by adding below kernel boot parameter::
+
+ "usbcore.autosuspend=-1"
+
+Before starting the debug target, you should connect the debug
+port to a USB port (root port or port of any external hub) on
+the debug host. The cable used to connect these two ports
+should be a USB 3.0 super-speed A-to-A debugging cable.
+
+During early boot of the debug target, DbC will be detected and
+initialized. After initialization, the debug host should be able
+to enumerate the debug device in debug target. The debug host
+will then bind the debug device with the usb_debug driver module
+and create the /dev/ttyUSB device.
+
+If the debug device enumeration goes smoothly, you should be able
+to see below kernel messages on the debug host::
+
+ # tail -f /var/log/kern.log
+ [ 1815.983374] usb 4-3: new SuperSpeed USB device number 4 using xhci_hcd
+ [ 1815.999595] usb 4-3: LPM exit latency is zeroed, disabling LPM.
+ [ 1815.999899] usb 4-3: New USB device found, idVendor=1d6b, idProduct=0004
+ [ 1815.999902] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
+ [ 1815.999903] usb 4-3: Product: Remote GDB
+ [ 1815.999904] usb 4-3: Manufacturer: Linux
+ [ 1815.999905] usb 4-3: SerialNumber: 0001
+ [ 1816.000240] usb_debug 4-3:1.0: xhci_dbc converter detected
+ [ 1816.000360] usb 4-3: xhci_dbc converter now attached to ttyUSB0
+
+You can use any communication program, for example minicom, to
+read and view the messages. Below simple bash scripts can help
+you to check the sanity of the setup.
+
+.. code-block:: sh
+
+ ===== start of bash scripts =============
+ #!/bin/bash
+
+ while true ; do
+ while [ ! -d /sys/class/tty/ttyUSB0 ] ; do
+ :
+ done
+ cat /dev/ttyUSB0
+ done
+ ===== end of bash scripts ===============
+
+Serial TTY
+==========
+
+The DbC support has been added to the xHCI driver. You can get a
+debug device provided by the DbC at runtime.
+
+In order to use this, you need to make sure your kernel has been
+configured to support USB_XHCI_DBGCAP. A sysfs attribute under
+the xHCI device node is used to enable or disable DbC. By default,
+DbC is disabled::
+
+ root@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
+ disabled
+
+Enable DbC with the following command::
+
+ root@target:/sys/bus/pci/devices/0000:00:14.0# echo enable > dbc
+
+You can check the DbC state at anytime::
+
+ root@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
+ enabled
+
+Connect the debug target to the debug host with a USB 3.0 super-
+speed A-to-A debugging cable. You can see /dev/ttyDBC0 created
+on the debug target. You will see below kernel message lines::
+
+ root@target: tail -f /var/log/kern.log
+ [ 182.730103] xhci_hcd 0000:00:14.0: DbC connected
+ [ 191.169420] xhci_hcd 0000:00:14.0: DbC configured
+ [ 191.169597] xhci_hcd 0000:00:14.0: DbC now attached to /dev/ttyDBC0
+
+Accordingly, the DbC state has been brought up to::
+
+ root@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
+ configured
+
+On the debug host, you will see the debug device has been enumerated.
+You will see below kernel message lines::
+
+ root@host: tail -f /var/log/kern.log
+ [ 79.454780] usb 2-2.1: new SuperSpeed USB device number 3 using xhci_hcd
+ [ 79.475003] usb 2-2.1: LPM exit latency is zeroed, disabling LPM.
+ [ 79.475389] usb 2-2.1: New USB device found, idVendor=1d6b, idProduct=0010
+ [ 79.475390] usb 2-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
+ [ 79.475391] usb 2-2.1: Product: Linux USB Debug Target
+ [ 79.475392] usb 2-2.1: Manufacturer: Linux Foundation
+ [ 79.475393] usb 2-2.1: SerialNumber: 0001
+
+The debug device works now. You can use any communication or debugging
+program to talk between the host and the target.
diff --git a/Documentation/driver-api/usb/writing_musb_glue_layer.rst b/Documentation/driver-api/usb/writing_musb_glue_layer.rst
new file mode 100644
index 0000000000..10416cc11c
--- /dev/null
+++ b/Documentation/driver-api/usb/writing_musb_glue_layer.rst
@@ -0,0 +1,720 @@
+=========================
+Writing a MUSB Glue Layer
+=========================
+
+:Author: Apelete Seketeli
+
+Introduction
+============
+
+The Linux MUSB subsystem is part of the larger Linux USB subsystem. It
+provides support for embedded USB Device Controllers (UDC) that do not
+use Universal Host Controller Interface (UHCI) or Open Host Controller
+Interface (OHCI).
+
+Instead, these embedded UDC rely on the USB On-the-Go (OTG)
+specification which they implement at least partially. The silicon
+reference design used in most cases is the Multipoint USB Highspeed
+Dual-Role Controller (MUSB HDRC) found in the Mentor Graphics Inventra™
+design.
+
+As a self-taught exercise I have written an MUSB glue layer for the
+Ingenic JZ4740 SoC, modelled after the many MUSB glue layers in the
+kernel source tree. This layer can be found at
+``drivers/usb/musb/jz4740.c``. In this documentation I will walk through the
+basics of the ``jz4740.c`` glue layer, explaining the different pieces and
+what needs to be done in order to write your own device glue layer.
+
+.. _musb-basics:
+
+Linux MUSB Basics
+=================
+
+To get started on the topic, please read USB On-the-Go Basics (see
+Resources) which provides an introduction of USB OTG operation at the
+hardware level. A couple of wiki pages by Texas Instruments and Analog
+Devices also provide an overview of the Linux kernel MUSB configuration,
+albeit focused on some specific devices provided by these companies.
+Finally, getting acquainted with the USB specification at USB home page
+may come in handy, with practical instance provided through the Writing
+USB Device Drivers documentation (again, see Resources).
+
+Linux USB stack is a layered architecture in which the MUSB controller
+hardware sits at the lowest. The MUSB controller driver abstract the
+MUSB controller hardware to the Linux USB stack::
+
+ ------------------------
+ | | <------- drivers/usb/gadget
+ | Linux USB Core Stack | <------- drivers/usb/host
+ | | <------- drivers/usb/core
+ ------------------------
+ ⬍
+ --------------------------
+ | | <------ drivers/usb/musb/musb_gadget.c
+ | MUSB Controller driver | <------ drivers/usb/musb/musb_host.c
+ | | <------ drivers/usb/musb/musb_core.c
+ --------------------------
+ ⬍
+ ---------------------------------
+ | MUSB Platform Specific Driver |
+ | | <-- drivers/usb/musb/jz4740.c
+ | aka "Glue Layer" |
+ ---------------------------------
+ ⬍
+ ---------------------------------
+ | MUSB Controller Hardware |
+ ---------------------------------
+
+As outlined above, the glue layer is actually the platform specific code
+sitting in between the controller driver and the controller hardware.
+
+Just like a Linux USB driver needs to register itself with the Linux USB
+subsystem, the MUSB glue layer needs first to register itself with the
+MUSB controller driver. This will allow the controller driver to know
+about which device the glue layer supports and which functions to call
+when a supported device is detected or released; remember we are talking
+about an embedded controller chip here, so no insertion or removal at
+run-time.
+
+All of this information is passed to the MUSB controller driver through
+a :c:type:`platform_driver` structure defined in the glue layer as::
+
+ static struct platform_driver jz4740_driver = {
+ .probe = jz4740_probe,
+ .remove = jz4740_remove,
+ .driver = {
+ .name = "musb-jz4740",
+ },
+ };
+
+The probe and remove function pointers are called when a matching device
+is detected and, respectively, released. The name string describes the
+device supported by this glue layer. In the current case it matches a
+platform_device structure declared in ``arch/mips/jz4740/platform.c``. Note
+that we are not using device tree bindings here.
+
+In order to register itself to the controller driver, the glue layer
+goes through a few steps, basically allocating the controller hardware
+resources and initialising a couple of circuits. To do so, it needs to
+keep track of the information used throughout these steps. This is done
+by defining a private ``jz4740_glue`` structure::
+
+ struct jz4740_glue {
+ struct device *dev;
+ struct platform_device *musb;
+ struct clk *clk;
+ };
+
+
+The dev and musb members are both device structure variables. The first
+one holds generic information about the device, since it's the basic
+device structure, and the latter holds information more closely related
+to the subsystem the device is registered to. The clk variable keeps
+information related to the device clock operation.
+
+Let's go through the steps of the probe function that leads the glue
+layer to register itself to the controller driver.
+
+.. note::
+
+ For the sake of readability each function will be split in logical
+ parts, each part being shown as if it was independent from the others.
+
+.. code-block:: c
+ :emphasize-lines: 8,12,18
+
+ static int jz4740_probe(struct platform_device *pdev)
+ {
+ struct platform_device *musb;
+ struct jz4740_glue *glue;
+ struct clk *clk;
+ int ret;
+
+ glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
+ if (!glue)
+ return -ENOMEM;
+
+ musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
+ if (!musb) {
+ dev_err(&pdev->dev, "failed to allocate musb device\n");
+ return -ENOMEM;
+ }
+
+ clk = devm_clk_get(&pdev->dev, "udc");
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "failed to get clock\n");
+ ret = PTR_ERR(clk);
+ goto err_platform_device_put;
+ }
+
+ ret = clk_prepare_enable(clk);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to enable clock\n");
+ goto err_platform_device_put;
+ }
+
+ musb->dev.parent = &pdev->dev;
+
+ glue->dev = &pdev->dev;
+ glue->musb = musb;
+ glue->clk = clk;
+
+ return 0;
+
+ err_platform_device_put:
+ platform_device_put(musb);
+ return ret;
+ }
+
+The first few lines of the probe function allocate and assign the glue,
+musb and clk variables. The ``GFP_KERNEL`` flag (line 8) allows the
+allocation process to sleep and wait for memory, thus being usable in a
+locking situation. The ``PLATFORM_DEVID_AUTO`` flag (line 12) allows
+automatic allocation and management of device IDs in order to avoid
+device namespace collisions with explicit IDs. With :c:func:`devm_clk_get`
+(line 18) the glue layer allocates the clock -- the ``devm_`` prefix
+indicates that :c:func:`clk_get` is managed: it automatically frees the
+allocated clock resource data when the device is released -- and enable
+it.
+
+
+
+Then comes the registration steps:
+
+.. code-block:: c
+ :emphasize-lines: 3,5,7,9,16
+
+ static int jz4740_probe(struct platform_device *pdev)
+ {
+ struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data;
+
+ pdata->platform_ops = &jz4740_musb_ops;
+
+ platform_set_drvdata(pdev, glue);
+
+ ret = platform_device_add_resources(musb, pdev->resource,
+ pdev->num_resources);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add resources\n");
+ goto err_clk_disable;
+ }
+
+ ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add platform_data\n");
+ goto err_clk_disable;
+ }
+
+ return 0;
+
+ err_clk_disable:
+ clk_disable_unprepare(clk);
+ err_platform_device_put:
+ platform_device_put(musb);
+ return ret;
+ }
+
+The first step is to pass the device data privately held by the glue
+layer on to the controller driver through :c:func:`platform_set_drvdata`
+(line 7). Next is passing on the device resources information, also privately
+held at that point, through :c:func:`platform_device_add_resources` (line 9).
+
+Finally comes passing on the platform specific data to the controller
+driver (line 16). Platform data will be discussed in
+:ref:`musb-dev-platform-data`, but here we are looking at the
+``platform_ops`` function pointer (line 5) in ``musb_hdrc_platform_data``
+structure (line 3). This function pointer allows the MUSB controller
+driver to know which function to call for device operation::
+
+ static const struct musb_platform_ops jz4740_musb_ops = {
+ .init = jz4740_musb_init,
+ .exit = jz4740_musb_exit,
+ };
+
+Here we have the minimal case where only init and exit functions are
+called by the controller driver when needed. Fact is the JZ4740 MUSB
+controller is a basic controller, lacking some features found in other
+controllers, otherwise we may also have pointers to a few other
+functions like a power management function or a function to switch
+between OTG and non-OTG modes, for instance.
+
+At that point of the registration process, the controller driver
+actually calls the init function:
+
+ .. code-block:: c
+ :emphasize-lines: 12,14
+
+ static int jz4740_musb_init(struct musb *musb)
+ {
+ musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
+ if (!musb->xceiv) {
+ pr_err("HS UDC: no transceiver configured\n");
+ return -ENODEV;
+ }
+
+ /* Silicon does not implement ConfigData register.
+ * Set dyn_fifo to avoid reading EP config from hardware.
+ */
+ musb->dyn_fifo = true;
+
+ musb->isr = jz4740_musb_interrupt;
+
+ return 0;
+ }
+
+The goal of ``jz4740_musb_init()`` is to get hold of the transceiver
+driver data of the MUSB controller hardware and pass it on to the MUSB
+controller driver, as usual. The transceiver is the circuitry inside the
+controller hardware responsible for sending/receiving the USB data.
+Since it is an implementation of the physical layer of the OSI model,
+the transceiver is also referred to as PHY.
+
+Getting hold of the ``MUSB PHY`` driver data is done with ``usb_get_phy()``
+which returns a pointer to the structure containing the driver instance
+data. The next couple of instructions (line 12 and 14) are used as a
+quirk and to setup IRQ handling respectively. Quirks and IRQ handling
+will be discussed later in :ref:`musb-dev-quirks` and
+:ref:`musb-handling-irqs`\ ::
+
+ static int jz4740_musb_exit(struct musb *musb)
+ {
+ usb_put_phy(musb->xceiv);
+
+ return 0;
+ }
+
+Acting as the counterpart of init, the exit function releases the MUSB
+PHY driver when the controller hardware itself is about to be released.
+
+Again, note that init and exit are fairly simple in this case due to the
+basic set of features of the JZ4740 controller hardware. When writing an
+musb glue layer for a more complex controller hardware, you might need
+to take care of more processing in those two functions.
+
+Returning from the init function, the MUSB controller driver jumps back
+into the probe function::
+
+ static int jz4740_probe(struct platform_device *pdev)
+ {
+ ret = platform_device_add(musb);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register musb device\n");
+ goto err_clk_disable;
+ }
+
+ return 0;
+
+ err_clk_disable:
+ clk_disable_unprepare(clk);
+ err_platform_device_put:
+ platform_device_put(musb);
+ return ret;
+ }
+
+This is the last part of the device registration process where the glue
+layer adds the controller hardware device to Linux kernel device
+hierarchy: at this stage, all known information about the device is
+passed on to the Linux USB core stack:
+
+ .. code-block:: c
+ :emphasize-lines: 5,6
+
+ static int jz4740_remove(struct platform_device *pdev)
+ {
+ struct jz4740_glue *glue = platform_get_drvdata(pdev);
+
+ platform_device_unregister(glue->musb);
+ clk_disable_unprepare(glue->clk);
+
+ return 0;
+ }
+
+Acting as the counterpart of probe, the remove function unregister the
+MUSB controller hardware (line 5) and disable the clock (line 6),
+allowing it to be gated.
+
+.. _musb-handling-irqs:
+
+Handling IRQs
+=============
+
+Additionally to the MUSB controller hardware basic setup and
+registration, the glue layer is also responsible for handling the IRQs:
+
+ .. code-block:: c
+ :emphasize-lines: 7,9-11,14,24
+
+ static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
+ {
+ unsigned long flags;
+ irqreturn_t retval = IRQ_NONE;
+ struct musb *musb = __hci;
+
+ spin_lock_irqsave(&musb->lock, flags);
+
+ musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
+ musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
+ musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
+
+ /*
+ * The controller is gadget only, the state of the host mode IRQ bits is
+ * undefined. Mask them to make sure that the musb driver core will
+ * never see them set
+ */
+ musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
+ MUSB_INTR_RESET | MUSB_INTR_SOF;
+
+ if (musb->int_usb || musb->int_tx || musb->int_rx)
+ retval = musb_interrupt(musb);
+
+ spin_unlock_irqrestore(&musb->lock, flags);
+
+ return retval;
+ }
+
+Here the glue layer mostly has to read the relevant hardware registers
+and pass their values on to the controller driver which will handle the
+actual event that triggered the IRQ.
+
+The interrupt handler critical section is protected by the
+:c:func:`spin_lock_irqsave` and counterpart :c:func:`spin_unlock_irqrestore`
+functions (line 7 and 24 respectively), which prevent the interrupt
+handler code to be run by two different threads at the same time.
+
+Then the relevant interrupt registers are read (line 9 to 11):
+
+- ``MUSB_INTRUSB``: indicates which USB interrupts are currently active,
+
+- ``MUSB_INTRTX``: indicates which of the interrupts for TX endpoints are
+ currently active,
+
+- ``MUSB_INTRRX``: indicates which of the interrupts for TX endpoints are
+ currently active.
+
+Note that :c:func:`musb_readb` is used to read 8-bit registers at most, while
+:c:func:`musb_readw` allows us to read at most 16-bit registers. There are
+other functions that can be used depending on the size of your device
+registers. See ``musb_io.h`` for more information.
+
+Instruction on line 18 is another quirk specific to the JZ4740 USB
+device controller, which will be discussed later in :ref:`musb-dev-quirks`.
+
+The glue layer still needs to register the IRQ handler though. Remember
+the instruction on line 14 of the init function::
+
+ static int jz4740_musb_init(struct musb *musb)
+ {
+ musb->isr = jz4740_musb_interrupt;
+
+ return 0;
+ }
+
+This instruction sets a pointer to the glue layer IRQ handler function,
+in order for the controller hardware to call the handler back when an
+IRQ comes from the controller hardware. The interrupt handler is now
+implemented and registered.
+
+.. _musb-dev-platform-data:
+
+Device Platform Data
+====================
+
+In order to write an MUSB glue layer, you need to have some data
+describing the hardware capabilities of your controller hardware, which
+is called the platform data.
+
+Platform data is specific to your hardware, though it may cover a broad
+range of devices, and is generally found somewhere in the ``arch/``
+directory, depending on your device architecture.
+
+For instance, platform data for the JZ4740 SoC is found in
+``arch/mips/jz4740/platform.c``. In the ``platform.c`` file each device of the
+JZ4740 SoC is described through a set of structures.
+
+Here is the part of ``arch/mips/jz4740/platform.c`` that covers the USB
+Device Controller (UDC):
+
+ .. code-block:: c
+ :emphasize-lines: 2,7,14-17,21,22,25,26,28,29
+
+ /* USB Device Controller */
+ struct platform_device jz4740_udc_xceiv_device = {
+ .name = "usb_phy_gen_xceiv",
+ .id = 0,
+ };
+
+ static struct resource jz4740_udc_resources[] = {
+ [0] = {
+ .start = JZ4740_UDC_BASE_ADDR,
+ .end = JZ4740_UDC_BASE_ADDR + 0x10000 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ [1] = {
+ .start = JZ4740_IRQ_UDC,
+ .end = JZ4740_IRQ_UDC,
+ .flags = IORESOURCE_IRQ,
+ .name = "mc",
+ },
+ };
+
+ struct platform_device jz4740_udc_device = {
+ .name = "musb-jz4740",
+ .id = -1,
+ .dev = {
+ .dma_mask = &jz4740_udc_device.dev.coherent_dma_mask,
+ .coherent_dma_mask = DMA_BIT_MASK(32),
+ },
+ .num_resources = ARRAY_SIZE(jz4740_udc_resources),
+ .resource = jz4740_udc_resources,
+ };
+
+The ``jz4740_udc_xceiv_device`` platform device structure (line 2)
+describes the UDC transceiver with a name and id number.
+
+At the time of this writing, note that ``usb_phy_gen_xceiv`` is the
+specific name to be used for all transceivers that are either built-in
+with reference USB IP or autonomous and doesn't require any PHY
+programming. You will need to set ``CONFIG_NOP_USB_XCEIV=y`` in the
+kernel configuration to make use of the corresponding transceiver
+driver. The id field could be set to -1 (equivalent to
+``PLATFORM_DEVID_NONE``), -2 (equivalent to ``PLATFORM_DEVID_AUTO``) or
+start with 0 for the first device of this kind if we want a specific id
+number.
+
+The ``jz4740_udc_resources`` resource structure (line 7) defines the UDC
+registers base addresses.
+
+The first array (line 9 to 11) defines the UDC registers base memory
+addresses: start points to the first register memory address, end points
+to the last register memory address and the flags member defines the
+type of resource we are dealing with. So ``IORESOURCE_MEM`` is used to
+define the registers memory addresses. The second array (line 14 to 17)
+defines the UDC IRQ registers addresses. Since there is only one IRQ
+register available for the JZ4740 UDC, start and end point at the same
+address. The ``IORESOURCE_IRQ`` flag tells that we are dealing with IRQ
+resources, and the name ``mc`` is in fact hard-coded in the MUSB core in
+order for the controller driver to retrieve this IRQ resource by
+querying it by its name.
+
+Finally, the ``jz4740_udc_device`` platform device structure (line 21)
+describes the UDC itself.
+
+The ``musb-jz4740`` name (line 22) defines the MUSB driver that is used
+for this device; remember this is in fact the name that we used in the
+``jz4740_driver`` platform driver structure in :ref:`musb-basics`.
+The id field (line 23) is set to -1 (equivalent to ``PLATFORM_DEVID_NONE``)
+since we do not need an id for the device: the MUSB controller driver was
+already set to allocate an automatic id in :ref:`musb-basics`. In the dev field
+we care for DMA related information here. The ``dma_mask`` field (line 25)
+defines the width of the DMA mask that is going to be used, and
+``coherent_dma_mask`` (line 26) has the same purpose but for the
+``alloc_coherent`` DMA mappings: in both cases we are using a 32 bits mask.
+Then the resource field (line 29) is simply a pointer to the resource
+structure defined before, while the ``num_resources`` field (line 28) keeps
+track of the number of arrays defined in the resource structure (in this
+case there were two resource arrays defined before).
+
+With this quick overview of the UDC platform data at the ``arch/`` level now
+done, let's get back to the MUSB glue layer specific platform data in
+``drivers/usb/musb/jz4740.c``:
+
+ .. code-block:: c
+ :emphasize-lines: 3,5,7-9,11
+
+ static struct musb_hdrc_config jz4740_musb_config = {
+ /* Silicon does not implement USB OTG. */
+ .multipoint = 0,
+ /* Max EPs scanned, driver will decide which EP can be used. */
+ .num_eps = 4,
+ /* RAMbits needed to configure EPs from table */
+ .ram_bits = 9,
+ .fifo_cfg = jz4740_musb_fifo_cfg,
+ .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
+ };
+
+ static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
+ .mode = MUSB_PERIPHERAL,
+ .config = &jz4740_musb_config,
+ };
+
+First the glue layer configures some aspects of the controller driver
+operation related to the controller hardware specifics. This is done
+through the ``jz4740_musb_config`` :c:type:`musb_hdrc_config` structure.
+
+Defining the OTG capability of the controller hardware, the multipoint
+member (line 3) is set to 0 (equivalent to false) since the JZ4740 UDC
+is not OTG compatible. Then ``num_eps`` (line 5) defines the number of USB
+endpoints of the controller hardware, including endpoint 0: here we have
+3 endpoints + endpoint 0. Next is ``ram_bits`` (line 7) which is the width
+of the RAM address bus for the MUSB controller hardware. This
+information is needed when the controller driver cannot automatically
+configure endpoints by reading the relevant controller hardware
+registers. This issue will be discussed when we get to device quirks in
+:ref:`musb-dev-quirks`. Last two fields (line 8 and 9) are also
+about device quirks: ``fifo_cfg`` points to the USB endpoints configuration
+table and ``fifo_cfg_size`` keeps track of the size of the number of
+entries in that configuration table. More on that later in
+:ref:`musb-dev-quirks`.
+
+Then this configuration is embedded inside ``jz4740_musb_platform_data``
+:c:type:`musb_hdrc_platform_data` structure (line 11): config is a pointer to
+the configuration structure itself, and mode tells the controller driver
+if the controller hardware may be used as ``MUSB_HOST`` only,
+``MUSB_PERIPHERAL`` only or ``MUSB_OTG`` which is a dual mode.
+
+Remember that ``jz4740_musb_platform_data`` is then used to convey
+platform data information as we have seen in the probe function in
+:ref:`musb-basics`.
+
+.. _musb-dev-quirks:
+
+Device Quirks
+=============
+
+Completing the platform data specific to your device, you may also need
+to write some code in the glue layer to work around some device specific
+limitations. These quirks may be due to some hardware bugs, or simply be
+the result of an incomplete implementation of the USB On-the-Go
+specification.
+
+The JZ4740 UDC exhibits such quirks, some of which we will discuss here
+for the sake of insight even though these might not be found in the
+controller hardware you are working on.
+
+Let's get back to the init function first:
+
+ .. code-block:: c
+ :emphasize-lines: 12
+
+ static int jz4740_musb_init(struct musb *musb)
+ {
+ musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
+ if (!musb->xceiv) {
+ pr_err("HS UDC: no transceiver configured\n");
+ return -ENODEV;
+ }
+
+ /* Silicon does not implement ConfigData register.
+ * Set dyn_fifo to avoid reading EP config from hardware.
+ */
+ musb->dyn_fifo = true;
+
+ musb->isr = jz4740_musb_interrupt;
+
+ return 0;
+ }
+
+Instruction on line 12 helps the MUSB controller driver to work around
+the fact that the controller hardware is missing registers that are used
+for USB endpoints configuration.
+
+Without these registers, the controller driver is unable to read the
+endpoints configuration from the hardware, so we use line 12 instruction
+to bypass reading the configuration from silicon, and rely on a
+hard-coded table that describes the endpoints configuration instead::
+
+ static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
+ { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
+ { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
+ { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
+ };
+
+Looking at the configuration table above, we see that each endpoints is
+described by three fields: ``hw_ep_num`` is the endpoint number, style is
+its direction (either ``FIFO_TX`` for the controller driver to send packets
+in the controller hardware, or ``FIFO_RX`` to receive packets from
+hardware), and maxpacket defines the maximum size of each data packet
+that can be transmitted over that endpoint. Reading from the table, the
+controller driver knows that endpoint 1 can be used to send and receive
+USB data packets of 512 bytes at once (this is in fact a bulk in/out
+endpoint), and endpoint 2 can be used to send data packets of 64 bytes
+at once (this is in fact an interrupt endpoint).
+
+Note that there is no information about endpoint 0 here: that one is
+implemented by default in every silicon design, with a predefined
+configuration according to the USB specification. For more examples of
+endpoint configuration tables, see ``musb_core.c``.
+
+Let's now get back to the interrupt handler function:
+
+ .. code-block:: c
+ :emphasize-lines: 18-19
+
+ static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
+ {
+ unsigned long flags;
+ irqreturn_t retval = IRQ_NONE;
+ struct musb *musb = __hci;
+
+ spin_lock_irqsave(&musb->lock, flags);
+
+ musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
+ musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
+ musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
+
+ /*
+ * The controller is gadget only, the state of the host mode IRQ bits is
+ * undefined. Mask them to make sure that the musb driver core will
+ * never see them set
+ */
+ musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
+ MUSB_INTR_RESET | MUSB_INTR_SOF;
+
+ if (musb->int_usb || musb->int_tx || musb->int_rx)
+ retval = musb_interrupt(musb);
+
+ spin_unlock_irqrestore(&musb->lock, flags);
+
+ return retval;
+ }
+
+Instruction on line 18 above is a way for the controller driver to work
+around the fact that some interrupt bits used for USB host mode
+operation are missing in the ``MUSB_INTRUSB`` register, thus left in an
+undefined hardware state, since this MUSB controller hardware is used in
+peripheral mode only. As a consequence, the glue layer masks these
+missing bits out to avoid parasite interrupts by doing a logical AND
+operation between the value read from ``MUSB_INTRUSB`` and the bits that
+are actually implemented in the register.
+
+These are only a couple of the quirks found in the JZ4740 USB device
+controller. Some others were directly addressed in the MUSB core since
+the fixes were generic enough to provide a better handling of the issues
+for others controller hardware eventually.
+
+Conclusion
+==========
+
+Writing a Linux MUSB glue layer should be a more accessible task, as
+this documentation tries to show the ins and outs of this exercise.
+
+The JZ4740 USB device controller being fairly simple, I hope its glue
+layer serves as a good example for the curious mind. Used with the
+current MUSB glue layers, this documentation should provide enough
+guidance to get started; should anything gets out of hand, the linux-usb
+mailing list archive is another helpful resource to browse through.
+
+Acknowledgements
+================
+
+Many thanks to Lars-Peter Clausen and Maarten ter Huurne for answering
+my questions while I was writing the JZ4740 glue layer and for helping
+me out getting the code in good shape.
+
+I would also like to thank the Qi-Hardware community at large for its
+cheerful guidance and support.
+
+Resources
+=========
+
+USB Home Page: https://www.usb.org
+
+linux-usb Mailing List Archives: https://marc.info/?l=linux-usb
+
+USB On-the-Go Basics:
+https://www.maximintegrated.com/app-notes/index.mvp/id/1822
+
+:ref:`Writing USB Device Drivers <writing-usb-driver>`
+
+Texas Instruments USB Configuration Wiki Page:
+http://processors.wiki.ti.com/index.php/Usbgeneralpage
diff --git a/Documentation/driver-api/usb/writing_usb_driver.rst b/Documentation/driver-api/usb/writing_usb_driver.rst
new file mode 100644
index 0000000000..95c4f5d140
--- /dev/null
+++ b/Documentation/driver-api/usb/writing_usb_driver.rst
@@ -0,0 +1,328 @@
+.. _writing-usb-driver:
+
+==========================
+Writing USB Device Drivers
+==========================
+
+:Author: Greg Kroah-Hartman
+
+Introduction
+============
+
+The Linux USB subsystem has grown from supporting only two different
+types of devices in the 2.2.7 kernel (mice and keyboards), to over 20
+different types of devices in the 2.4 kernel. Linux currently supports
+almost all USB class devices (standard types of devices like keyboards,
+mice, modems, printers and speakers) and an ever-growing number of
+vendor-specific devices (such as USB to serial converters, digital
+cameras, Ethernet devices and MP3 players). For a full list of the
+different USB devices currently supported, see Resources.
+
+The remaining kinds of USB devices that do not have support on Linux are
+almost all vendor-specific devices. Each vendor decides to implement a
+custom protocol to talk to their device, so a custom driver usually
+needs to be created. Some vendors are open with their USB protocols and
+help with the creation of Linux drivers, while others do not publish
+them, and developers are forced to reverse-engineer. See Resources for
+some links to handy reverse-engineering tools.
+
+Because each different protocol causes a new driver to be created, I
+have written a generic USB driver skeleton, modelled after the
+pci-skeleton.c file in the kernel source tree upon which many PCI
+network drivers have been based. This USB skeleton can be found at
+drivers/usb/usb-skeleton.c in the kernel source tree. In this article I
+will walk through the basics of the skeleton driver, explaining the
+different pieces and what needs to be done to customize it to your
+specific device.
+
+Linux USB Basics
+================
+
+If you are going to write a Linux USB driver, please become familiar
+with the USB protocol specification. It can be found, along with many
+other useful documents, at the USB home page (see Resources). An
+excellent introduction to the Linux USB subsystem can be found at the
+USB Working Devices List (see Resources). It explains how the Linux USB
+subsystem is structured and introduces the reader to the concept of USB
+urbs (USB Request Blocks), which are essential to USB drivers.
+
+The first thing a Linux USB driver needs to do is register itself with
+the Linux USB subsystem, giving it some information about which devices
+the driver supports and which functions to call when a device supported
+by the driver is inserted or removed from the system. All of this
+information is passed to the USB subsystem in the :c:type:`usb_driver`
+structure. The skeleton driver declares a :c:type:`usb_driver` as::
+
+ static struct usb_driver skel_driver = {
+ .name = "skeleton",
+ .probe = skel_probe,
+ .disconnect = skel_disconnect,
+ .suspend = skel_suspend,
+ .resume = skel_resume,
+ .pre_reset = skel_pre_reset,
+ .post_reset = skel_post_reset,
+ .id_table = skel_table,
+ .supports_autosuspend = 1,
+ };
+
+
+The variable name is a string that describes the driver. It is used in
+informational messages printed to the system log. The probe and
+disconnect function pointers are called when a device that matches the
+information provided in the ``id_table`` variable is either seen or
+removed.
+
+The fops and minor variables are optional. Most USB drivers hook into
+another kernel subsystem, such as the SCSI, network or TTY subsystem.
+These types of drivers register themselves with the other kernel
+subsystem, and any user-space interactions are provided through that
+interface. But for drivers that do not have a matching kernel subsystem,
+such as MP3 players or scanners, a method of interacting with user space
+is needed. The USB subsystem provides a way to register a minor device
+number and a set of :c:type:`file_operations` function pointers that enable
+this user-space interaction. The skeleton driver needs this kind of
+interface, so it provides a minor starting number and a pointer to its
+:c:type:`file_operations` functions.
+
+The USB driver is then registered with a call to usb_register(),
+usually in the driver's init function, as shown here::
+
+ static int __init usb_skel_init(void)
+ {
+ int result;
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&skel_driver);
+ if (result < 0) {
+ pr_err("usb_register failed for the %s driver. Error number %d\n",
+ skel_driver.name, result);
+ return -1;
+ }
+
+ return 0;
+ }
+ module_init(usb_skel_init);
+
+
+When the driver is unloaded from the system, it needs to deregister
+itself with the USB subsystem. This is done with usb_deregister()
+function::
+
+ static void __exit usb_skel_exit(void)
+ {
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&skel_driver);
+ }
+ module_exit(usb_skel_exit);
+
+
+To enable the linux-hotplug system to load the driver automatically when
+the device is plugged in, you need to create a ``MODULE_DEVICE_TABLE``.
+The following code tells the hotplug scripts that this module supports a
+single device with a specific vendor and product ID::
+
+ /* table of devices that work with this driver */
+ static struct usb_device_id skel_table [] = {
+ { USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
+ { } /* Terminating entry */
+ };
+ MODULE_DEVICE_TABLE (usb, skel_table);
+
+
+There are other macros that can be used in describing a struct
+:c:type:`usb_device_id` for drivers that support a whole class of USB
+drivers. See :ref:`usb.h <usb_header>` for more information on this.
+
+Device operation
+================
+
+When a device is plugged into the USB bus that matches the device ID
+pattern that your driver registered with the USB core, the probe
+function is called. The :c:type:`usb_device` structure, interface number and
+the interface ID are passed to the function::
+
+ static int skel_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+
+
+The driver now needs to verify that this device is actually one that it
+can accept. If so, it returns 0. If not, or if any error occurs during
+initialization, an errorcode (such as ``-ENOMEM`` or ``-ENODEV``) is
+returned from the probe function.
+
+In the skeleton driver, we determine what end points are marked as
+bulk-in and bulk-out. We create buffers to hold the data that will be
+sent and received from the device, and a USB urb to write data to the
+device is initialized.
+
+Conversely, when the device is removed from the USB bus, the disconnect
+function is called with the device pointer. The driver needs to clean
+any private data that has been allocated at this time and to shut down
+any pending urbs that are in the USB system.
+
+Now that the device is plugged into the system and the driver is bound
+to the device, any of the functions in the :c:type:`file_operations` structure
+that were passed to the USB subsystem will be called from a user program
+trying to talk to the device. The first function called will be open, as
+the program tries to open the device for I/O. We increment our private
+usage count and save a pointer to our internal structure in the file
+structure. This is done so that future calls to file operations will
+enable the driver to determine which device the user is addressing. All
+of this is done with the following code::
+
+ /* increment our usage count for the device */
+ kref_get(&dev->kref);
+
+ /* save our object in the file's private structure */
+ file->private_data = dev;
+
+
+After the open function is called, the read and write functions are
+called to receive and send data to the device. In the ``skel_write``
+function, we receive a pointer to some data that the user wants to send
+to the device and the size of the data. The function determines how much
+data it can send to the device based on the size of the write urb it has
+created (this size depends on the size of the bulk out end point that
+the device has). Then it copies the data from user space to kernel
+space, points the urb to the data and submits the urb to the USB
+subsystem. This can be seen in the following code::
+
+ /* we can only write as much as 1 urb will hold */
+ size_t writesize = min_t(size_t, count, MAX_TRANSFER);
+
+ /* copy the data from user space into our urb */
+ copy_from_user(buf, user_buffer, writesize);
+
+ /* set up our urb */
+ usb_fill_bulk_urb(urb,
+ dev->udev,
+ usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
+ buf,
+ writesize,
+ skel_write_bulk_callback,
+ dev);
+
+ /* send the data out the bulk port */
+ retval = usb_submit_urb(urb, GFP_KERNEL);
+ if (retval) {
+ dev_err(&dev->interface->dev,
+ "%s - failed submitting write urb, error %d\n",
+ __func__, retval);
+ }
+
+
+When the write urb is filled up with the proper information using the
+:c:func:`usb_fill_bulk_urb` function, we point the urb's completion callback
+to call our own ``skel_write_bulk_callback`` function. This function is
+called when the urb is finished by the USB subsystem. The callback
+function is called in interrupt context, so caution must be taken not to
+do very much processing at that time. Our implementation of
+``skel_write_bulk_callback`` merely reports if the urb was completed
+successfully or not and then returns.
+
+The read function works a bit differently from the write function in
+that we do not use an urb to transfer data from the device to the
+driver. Instead we call the :c:func:`usb_bulk_msg` function, which can be used
+to send or receive data from a device without having to create urbs and
+handle urb completion callback functions. We call the :c:func:`usb_bulk_msg`
+function, giving it a buffer into which to place any data received from
+the device and a timeout value. If the timeout period expires without
+receiving any data from the device, the function will fail and return an
+error message. This can be shown with the following code::
+
+ /* do an immediate bulk read to get data from the device */
+ retval = usb_bulk_msg (skel->dev,
+ usb_rcvbulkpipe (skel->dev,
+ skel->bulk_in_endpointAddr),
+ skel->bulk_in_buffer,
+ skel->bulk_in_size,
+ &count, 5000);
+ /* if the read was successful, copy the data to user space */
+ if (!retval) {
+ if (copy_to_user (buffer, skel->bulk_in_buffer, count))
+ retval = -EFAULT;
+ else
+ retval = count;
+ }
+
+
+The :c:func:`usb_bulk_msg` function can be very useful for doing single reads
+or writes to a device; however, if you need to read or write constantly to
+a device, it is recommended to set up your own urbs and submit them to
+the USB subsystem.
+
+When the user program releases the file handle that it has been using to
+talk to the device, the release function in the driver is called. In
+this function we decrement our private usage count and wait for possible
+pending writes::
+
+ /* decrement our usage count for the device */
+ --skel->open_count;
+
+
+One of the more difficult problems that USB drivers must be able to
+handle smoothly is the fact that the USB device may be removed from the
+system at any point in time, even if a program is currently talking to
+it. It needs to be able to shut down any current reads and writes and
+notify the user-space programs that the device is no longer there. The
+following code (function ``skel_delete``) is an example of how to do
+this::
+
+ static inline void skel_delete (struct usb_skel *dev)
+ {
+ kfree (dev->bulk_in_buffer);
+ if (dev->bulk_out_buffer != NULL)
+ usb_free_coherent (dev->udev, dev->bulk_out_size,
+ dev->bulk_out_buffer,
+ dev->write_urb->transfer_dma);
+ usb_free_urb (dev->write_urb);
+ kfree (dev);
+ }
+
+
+If a program currently has an open handle to the device, we reset the
+flag ``device_present``. For every read, write, release and other
+functions that expect a device to be present, the driver first checks
+this flag to see if the device is still present. If not, it releases
+that the device has disappeared, and a ``-ENODEV`` error is returned to the
+user-space program. When the release function is eventually called, it
+determines if there is no device and if not, it does the cleanup that
+the ``skel_disconnect`` function normally does if there are no open files
+on the device (see Listing 5).
+
+Isochronous Data
+================
+
+This usb-skeleton driver does not have any examples of interrupt or
+isochronous data being sent to or from the device. Interrupt data is
+sent almost exactly as bulk data is, with a few minor exceptions.
+Isochronous data works differently with continuous streams of data being
+sent to or from the device. The audio and video camera drivers are very
+good examples of drivers that handle isochronous data and will be useful
+if you also need to do this.
+
+Conclusion
+==========
+
+Writing Linux USB device drivers is not a difficult task as the
+usb-skeleton driver shows. This driver, combined with the other current
+USB drivers, should provide enough examples to help a beginning author
+create a working driver in a minimal amount of time. The linux-usb-devel
+mailing list archives also contain a lot of helpful information.
+
+Resources
+=========
+
+The Linux USB Project:
+http://www.linux-usb.org/
+
+Linux Hotplug Project:
+http://linux-hotplug.sourceforge.net/
+
+linux-usb Mailing List Archives:
+https://lore.kernel.org/linux-usb/
+
+Programming Guide for Linux USB Device Drivers:
+https://lmu.web.psi.ch/docu/manuals/software_manuals/linux_sl/usb_linux_programming_guide.pdf
+
+USB Home Page: https://www.usb.org
diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst
new file mode 100644
index 0000000000..bbd548b66b
--- /dev/null
+++ b/Documentation/driver-api/vfio-mediated-device.rst
@@ -0,0 +1,273 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+.. include:: <isonum.txt>
+
+=====================
+VFIO Mediated devices
+=====================
+
+:Copyright: |copy| 2016, NVIDIA CORPORATION. All rights reserved.
+:Author: Neo Jia <cjia@nvidia.com>
+:Author: Kirti Wankhede <kwankhede@nvidia.com>
+
+
+
+Virtual Function I/O (VFIO) Mediated devices[1]
+===============================================
+
+The number of use cases for virtualizing DMA devices that do not have built-in
+SR_IOV capability is increasing. Previously, to virtualize such devices,
+developers had to create their own management interfaces and APIs, and then
+integrate them with user space software. To simplify integration with user space
+software, we have identified common requirements and a unified management
+interface for such devices.
+
+The VFIO driver framework provides unified APIs for direct device access. It is
+an IOMMU/device-agnostic framework for exposing direct device access to user
+space in a secure, IOMMU-protected environment. This framework is used for
+multiple devices, such as GPUs, network adapters, and compute accelerators. With
+direct device access, virtual machines or user space applications have direct
+access to the physical device. This framework is reused for mediated devices.
+
+The mediated core driver provides a common interface for mediated device
+management that can be used by drivers of different devices. This module
+provides a generic interface to perform these operations:
+
+* Create and destroy a mediated device
+* Add a mediated device to and remove it from a mediated bus driver
+* Add a mediated device to and remove it from an IOMMU group
+
+The mediated core driver also provides an interface to register a bus driver.
+For example, the mediated VFIO mdev driver is designed for mediated devices and
+supports VFIO APIs. The mediated bus driver adds a mediated device to and
+removes it from a VFIO group.
+
+The following high-level block diagram shows the main components and interfaces
+in the VFIO mediated driver framework. The diagram shows NVIDIA, Intel, and IBM
+devices as examples, as these devices are the first devices to use this module::
+
+ +---------------+
+ | |
+ | +-----------+ | mdev_register_driver() +--------------+
+ | | | +<------------------------+ |
+ | | mdev | | | |
+ | | bus | +------------------------>+ vfio_mdev.ko |<-> VFIO user
+ | | driver | | probe()/remove() | | APIs
+ | | | | +--------------+
+ | +-----------+ |
+ | |
+ | MDEV CORE |
+ | MODULE |
+ | mdev.ko |
+ | +-----------+ | mdev_register_parent() +--------------+
+ | | | +<------------------------+ |
+ | | | | | ccw_device.ko|<-> physical
+ | | | +------------------------>+ | device
+ | | | | callbacks +--------------+
+ | | Physical | |
+ | | device | | mdev_register_parent() +--------------+
+ | | interface | |<------------------------+ |
+ | | | | | i915.ko |<-> physical
+ | | | +------------------------>+ | device
+ | | | | callbacks +--------------+
+ | +-----------+ |
+ +---------------+
+
+
+Registration Interfaces
+=======================
+
+The mediated core driver provides the following types of registration
+interfaces:
+
+* Registration interface for a mediated bus driver
+* Physical device driver interface
+
+Registration Interface for a Mediated Bus Driver
+------------------------------------------------
+
+The registration interface for a mediated device driver provides the following
+structure to represent a mediated device's driver::
+
+ /*
+ * struct mdev_driver [2] - Mediated device's driver
+ * @probe: called when new device created
+ * @remove: called when device removed
+ * @driver: device driver structure
+ */
+ struct mdev_driver {
+ int (*probe) (struct mdev_device *dev);
+ void (*remove) (struct mdev_device *dev);
+ unsigned int (*get_available)(struct mdev_type *mtype);
+ ssize_t (*show_description)(struct mdev_type *mtype, char *buf);
+ struct device_driver driver;
+ };
+
+A mediated bus driver for mdev should use this structure in the function calls
+to register and unregister itself with the core driver:
+
+* Register::
+
+ int mdev_register_driver(struct mdev_driver *drv);
+
+* Unregister::
+
+ void mdev_unregister_driver(struct mdev_driver *drv);
+
+The mediated bus driver's probe function should create a vfio_device on top of
+the mdev_device and connect it to an appropriate implementation of
+vfio_device_ops.
+
+When a driver wants to add the GUID creation sysfs to an existing device it has
+probe'd to then it should call::
+
+ int mdev_register_parent(struct mdev_parent *parent, struct device *dev,
+ struct mdev_driver *mdev_driver);
+
+This will provide the 'mdev_supported_types/XX/create' files which can then be
+used to trigger the creation of a mdev_device. The created mdev_device will be
+attached to the specified driver.
+
+When the driver needs to remove itself it calls::
+
+ void mdev_unregister_parent(struct mdev_parent *parent);
+
+Which will unbind and destroy all the created mdevs and remove the sysfs files.
+
+Mediated Device Management Interface Through sysfs
+==================================================
+
+The management interface through sysfs enables user space software, such as
+libvirt, to query and configure mediated devices in a hardware-agnostic fashion.
+This management interface provides flexibility to the underlying physical
+device's driver to support features such as:
+
+* Mediated device hot plug
+* Multiple mediated devices in a single virtual machine
+* Multiple mediated devices from different physical devices
+
+Links in the mdev_bus Class Directory
+-------------------------------------
+The /sys/class/mdev_bus/ directory contains links to devices that are registered
+with the mdev core driver.
+
+Directories and files under the sysfs for Each Physical Device
+--------------------------------------------------------------
+
+::
+
+ |- [parent physical device]
+ |--- Vendor-specific-attributes [optional]
+ |--- [mdev_supported_types]
+ | |--- [<type-id>]
+ | | |--- create
+ | | |--- name
+ | | |--- available_instances
+ | | |--- device_api
+ | | |--- description
+ | | |--- [devices]
+ | |--- [<type-id>]
+ | | |--- create
+ | | |--- name
+ | | |--- available_instances
+ | | |--- device_api
+ | | |--- description
+ | | |--- [devices]
+ | |--- [<type-id>]
+ | |--- create
+ | |--- name
+ | |--- available_instances
+ | |--- device_api
+ | |--- description
+ | |--- [devices]
+
+* [mdev_supported_types]
+
+ The list of currently supported mediated device types and their details.
+
+ [<type-id>], device_api, and available_instances are mandatory attributes
+ that should be provided by vendor driver.
+
+* [<type-id>]
+
+ The [<type-id>] name is created by adding the device driver string as a prefix
+ to the string provided by the vendor driver. This format of this name is as
+ follows::
+
+ sprintf(buf, "%s-%s", dev_driver_string(parent->dev), group->name);
+
+* device_api
+
+ This attribute shows which device API is being created, for example,
+ "vfio-pci" for a PCI device.
+
+* available_instances
+
+ This attribute shows the number of devices of type <type-id> that can be
+ created.
+
+* [device]
+
+ This directory contains links to the devices of type <type-id> that have been
+ created.
+
+* name
+
+ This attribute shows a human readable name.
+
+* description
+
+ This attribute can show brief features/description of the type. This is an
+ optional attribute.
+
+Directories and Files Under the sysfs for Each mdev Device
+----------------------------------------------------------
+
+::
+
+ |- [parent phy device]
+ |--- [$MDEV_UUID]
+ |--- remove
+ |--- mdev_type {link to its type}
+ |--- vendor-specific-attributes [optional]
+
+* remove (write only)
+
+Writing '1' to the 'remove' file destroys the mdev device. The vendor driver can
+fail the remove() callback if that device is active and the vendor driver
+doesn't support hot unplug.
+
+Example::
+
+ # echo 1 > /sys/bus/mdev/devices/$mdev_UUID/remove
+
+Mediated device Hot plug
+------------------------
+
+Mediated devices can be created and assigned at runtime. The procedure to hot
+plug a mediated device is the same as the procedure to hot plug a PCI device.
+
+Translation APIs for Mediated Devices
+=====================================
+
+The following APIs are provided for translating user pfn to host pfn in a VFIO
+driver::
+
+ int vfio_pin_pages(struct vfio_device *device, dma_addr_t iova,
+ int npage, int prot, struct page **pages);
+
+ void vfio_unpin_pages(struct vfio_device *device, dma_addr_t iova,
+ int npage);
+
+These functions call back into the back-end IOMMU module by using the pin_pages
+and unpin_pages callbacks of the struct vfio_iommu_driver_ops[4]. Currently
+these callbacks are supported in the TYPE1 IOMMU module. To enable them for
+other IOMMU backend modules, such as PPC64 sPAPR module, they need to provide
+these two callback functions.
+
+References
+==========
+
+1. See Documentation/driver-api/vfio.rst for more information on VFIO.
+2. struct mdev_driver in include/linux/mdev.h
+3. struct mdev_parent_ops in include/linux/mdev.h
+4. struct vfio_iommu_driver_ops in include/linux/vfio.h
diff --git a/Documentation/driver-api/vfio-pci-device-specific-driver-acceptance.rst b/Documentation/driver-api/vfio-pci-device-specific-driver-acceptance.rst
new file mode 100644
index 0000000000..b7b99b876b
--- /dev/null
+++ b/Documentation/driver-api/vfio-pci-device-specific-driver-acceptance.rst
@@ -0,0 +1,35 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Acceptance criteria for vfio-pci device specific driver variants
+================================================================
+
+Overview
+--------
+The vfio-pci driver exists as a device agnostic driver using the
+system IOMMU and relying on the robustness of platform fault
+handling to provide isolated device access to userspace. While the
+vfio-pci driver does include some device specific support, further
+extensions for yet more advanced device specific features are not
+sustainable. The vfio-pci driver has therefore split out
+vfio-pci-core as a library that may be reused to implement features
+requiring device specific knowledge, ex. saving and loading device
+state for the purposes of supporting migration.
+
+In support of such features, it's expected that some device specific
+variants may interact with parent devices (ex. SR-IOV PF in support of
+a user assigned VF) or other extensions that may not be otherwise
+accessible via the vfio-pci base driver. Authors of such drivers
+should be diligent not to create exploitable interfaces via these
+interactions or allow unchecked userspace data to have an effect
+beyond the scope of the assigned device.
+
+New driver submissions are therefore requested to have approval via
+sign-off/ack/review/etc for any interactions with parent drivers.
+Additionally, drivers should make an attempt to provide sufficient
+documentation for reviewers to understand the device specific
+extensions, for example in the case of migration data, how is the
+device state composed and consumed, which portions are not otherwise
+available to the user via vfio-pci, what safeguards exist to validate
+the data, etc. To that extent, authors should additionally expect to
+require reviews from at least one of the listed reviewers, in addition
+to the overall vfio maintainer.
diff --git a/Documentation/driver-api/vfio.rst b/Documentation/driver-api/vfio.rst
new file mode 100644
index 0000000000..633d11c7fa
--- /dev/null
+++ b/Documentation/driver-api/vfio.rst
@@ -0,0 +1,707 @@
+==================================
+VFIO - "Virtual Function I/O" [1]_
+==================================
+
+Many modern systems now provide DMA and interrupt remapping facilities
+to help ensure I/O devices behave within the boundaries they've been
+allotted. This includes x86 hardware with AMD-Vi and Intel VT-d,
+POWER systems with Partitionable Endpoints (PEs) and embedded PowerPC
+systems such as Freescale PAMU. The VFIO driver is an IOMMU/device
+agnostic framework for exposing direct device access to userspace, in
+a secure, IOMMU protected environment. In other words, this allows
+safe [2]_, non-privileged, userspace drivers.
+
+Why do we want that? Virtual machines often make use of direct device
+access ("device assignment") when configured for the highest possible
+I/O performance. From a device and host perspective, this simply
+turns the VM into a userspace driver, with the benefits of
+significantly reduced latency, higher bandwidth, and direct use of
+bare-metal device drivers [3]_.
+
+Some applications, particularly in the high performance computing
+field, also benefit from low-overhead, direct device access from
+userspace. Examples include network adapters (often non-TCP/IP based)
+and compute accelerators. Prior to VFIO, these drivers had to either
+go through the full development cycle to become proper upstream
+driver, be maintained out of tree, or make use of the UIO framework,
+which has no notion of IOMMU protection, limited interrupt support,
+and requires root privileges to access things like PCI configuration
+space.
+
+The VFIO driver framework intends to unify these, replacing both the
+KVM PCI specific device assignment code as well as provide a more
+secure, more featureful userspace driver environment than UIO.
+
+Groups, Devices, and IOMMUs
+---------------------------
+
+Devices are the main target of any I/O driver. Devices typically
+create a programming interface made up of I/O access, interrupts,
+and DMA. Without going into the details of each of these, DMA is
+by far the most critical aspect for maintaining a secure environment
+as allowing a device read-write access to system memory imposes the
+greatest risk to the overall system integrity.
+
+To help mitigate this risk, many modern IOMMUs now incorporate
+isolation properties into what was, in many cases, an interface only
+meant for translation (ie. solving the addressing problems of devices
+with limited address spaces). With this, devices can now be isolated
+from each other and from arbitrary memory access, thus allowing
+things like secure direct assignment of devices into virtual machines.
+
+This isolation is not always at the granularity of a single device
+though. Even when an IOMMU is capable of this, properties of devices,
+interconnects, and IOMMU topologies can each reduce this isolation.
+For instance, an individual device may be part of a larger multi-
+function enclosure. While the IOMMU may be able to distinguish
+between devices within the enclosure, the enclosure may not require
+transactions between devices to reach the IOMMU. Examples of this
+could be anything from a multi-function PCI device with backdoors
+between functions to a non-PCI-ACS (Access Control Services) capable
+bridge allowing redirection without reaching the IOMMU. Topology
+can also play a factor in terms of hiding devices. A PCIe-to-PCI
+bridge masks the devices behind it, making transaction appear as if
+from the bridge itself. Obviously IOMMU design plays a major factor
+as well.
+
+Therefore, while for the most part an IOMMU may have device level
+granularity, any system is susceptible to reduced granularity. The
+IOMMU API therefore supports a notion of IOMMU groups. A group is
+a set of devices which is isolatable from all other devices in the
+system. Groups are therefore the unit of ownership used by VFIO.
+
+While the group is the minimum granularity that must be used to
+ensure secure user access, it's not necessarily the preferred
+granularity. In IOMMUs which make use of page tables, it may be
+possible to share a set of page tables between different groups,
+reducing the overhead both to the platform (reduced TLB thrashing,
+reduced duplicate page tables), and to the user (programming only
+a single set of translations). For this reason, VFIO makes use of
+a container class, which may hold one or more groups. A container
+is created by simply opening the /dev/vfio/vfio character device.
+
+On its own, the container provides little functionality, with all
+but a couple version and extension query interfaces locked away.
+The user needs to add a group into the container for the next level
+of functionality. To do this, the user first needs to identify the
+group associated with the desired device. This can be done using
+the sysfs links described in the example below. By unbinding the
+device from the host driver and binding it to a VFIO driver, a new
+VFIO group will appear for the group as /dev/vfio/$GROUP, where
+$GROUP is the IOMMU group number of which the device is a member.
+If the IOMMU group contains multiple devices, each will need to
+be bound to a VFIO driver before operations on the VFIO group
+are allowed (it's also sufficient to only unbind the device from
+host drivers if a VFIO driver is unavailable; this will make the
+group available, but not that particular device). TBD - interface
+for disabling driver probing/locking a device.
+
+Once the group is ready, it may be added to the container by opening
+the VFIO group character device (/dev/vfio/$GROUP) and using the
+VFIO_GROUP_SET_CONTAINER ioctl, passing the file descriptor of the
+previously opened container file. If desired and if the IOMMU driver
+supports sharing the IOMMU context between groups, multiple groups may
+be set to the same container. If a group fails to set to a container
+with existing groups, a new empty container will need to be used
+instead.
+
+With a group (or groups) attached to a container, the remaining
+ioctls become available, enabling access to the VFIO IOMMU interfaces.
+Additionally, it now becomes possible to get file descriptors for each
+device within a group using an ioctl on the VFIO group file descriptor.
+
+The VFIO device API includes ioctls for describing the device, the I/O
+regions and their read/write/mmap offsets on the device descriptor, as
+well as mechanisms for describing and registering interrupt
+notifications.
+
+VFIO Usage Example
+------------------
+
+Assume user wants to access PCI device 0000:06:0d.0::
+
+ $ readlink /sys/bus/pci/devices/0000:06:0d.0/iommu_group
+ ../../../../kernel/iommu_groups/26
+
+This device is therefore in IOMMU group 26. This device is on the
+pci bus, therefore the user will make use of vfio-pci to manage the
+group::
+
+ # modprobe vfio-pci
+
+Binding this device to the vfio-pci driver creates the VFIO group
+character devices for this group::
+
+ $ lspci -n -s 0000:06:0d.0
+ 06:0d.0 0401: 1102:0002 (rev 08)
+ # echo 0000:06:0d.0 > /sys/bus/pci/devices/0000:06:0d.0/driver/unbind
+ # echo 1102 0002 > /sys/bus/pci/drivers/vfio-pci/new_id
+
+Now we need to look at what other devices are in the group to free
+it for use by VFIO::
+
+ $ ls -l /sys/bus/pci/devices/0000:06:0d.0/iommu_group/devices
+ total 0
+ lrwxrwxrwx. 1 root root 0 Apr 23 16:13 0000:00:1e.0 ->
+ ../../../../devices/pci0000:00/0000:00:1e.0
+ lrwxrwxrwx. 1 root root 0 Apr 23 16:13 0000:06:0d.0 ->
+ ../../../../devices/pci0000:00/0000:00:1e.0/0000:06:0d.0
+ lrwxrwxrwx. 1 root root 0 Apr 23 16:13 0000:06:0d.1 ->
+ ../../../../devices/pci0000:00/0000:00:1e.0/0000:06:0d.1
+
+This device is behind a PCIe-to-PCI bridge [4]_, therefore we also
+need to add device 0000:06:0d.1 to the group following the same
+procedure as above. Device 0000:00:1e.0 is a bridge that does
+not currently have a host driver, therefore it's not required to
+bind this device to the vfio-pci driver (vfio-pci does not currently
+support PCI bridges).
+
+The final step is to provide the user with access to the group if
+unprivileged operation is desired (note that /dev/vfio/vfio provides
+no capabilities on its own and is therefore expected to be set to
+mode 0666 by the system)::
+
+ # chown user:user /dev/vfio/26
+
+The user now has full access to all the devices and the iommu for this
+group and can access them as follows::
+
+ int container, group, device, i;
+ struct vfio_group_status group_status =
+ { .argsz = sizeof(group_status) };
+ struct vfio_iommu_type1_info iommu_info = { .argsz = sizeof(iommu_info) };
+ struct vfio_iommu_type1_dma_map dma_map = { .argsz = sizeof(dma_map) };
+ struct vfio_device_info device_info = { .argsz = sizeof(device_info) };
+
+ /* Create a new container */
+ container = open("/dev/vfio/vfio", O_RDWR);
+
+ if (ioctl(container, VFIO_GET_API_VERSION) != VFIO_API_VERSION)
+ /* Unknown API version */
+
+ if (!ioctl(container, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU))
+ /* Doesn't support the IOMMU driver we want. */
+
+ /* Open the group */
+ group = open("/dev/vfio/26", O_RDWR);
+
+ /* Test the group is viable and available */
+ ioctl(group, VFIO_GROUP_GET_STATUS, &group_status);
+
+ if (!(group_status.flags & VFIO_GROUP_FLAGS_VIABLE))
+ /* Group is not viable (ie, not all devices bound for vfio) */
+
+ /* Add the group to the container */
+ ioctl(group, VFIO_GROUP_SET_CONTAINER, &container);
+
+ /* Enable the IOMMU model we want */
+ ioctl(container, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU);
+
+ /* Get addition IOMMU info */
+ ioctl(container, VFIO_IOMMU_GET_INFO, &iommu_info);
+
+ /* Allocate some space and setup a DMA mapping */
+ dma_map.vaddr = mmap(0, 1024 * 1024, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+ dma_map.size = 1024 * 1024;
+ dma_map.iova = 0; /* 1MB starting at 0x0 from device view */
+ dma_map.flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE;
+
+ ioctl(container, VFIO_IOMMU_MAP_DMA, &dma_map);
+
+ /* Get a file descriptor for the device */
+ device = ioctl(group, VFIO_GROUP_GET_DEVICE_FD, "0000:06:0d.0");
+
+ /* Test and setup the device */
+ ioctl(device, VFIO_DEVICE_GET_INFO, &device_info);
+
+ for (i = 0; i < device_info.num_regions; i++) {
+ struct vfio_region_info reg = { .argsz = sizeof(reg) };
+
+ reg.index = i;
+
+ ioctl(device, VFIO_DEVICE_GET_REGION_INFO, &reg);
+
+ /* Setup mappings... read/write offsets, mmaps
+ * For PCI devices, config space is a region */
+ }
+
+ for (i = 0; i < device_info.num_irqs; i++) {
+ struct vfio_irq_info irq = { .argsz = sizeof(irq) };
+
+ irq.index = i;
+
+ ioctl(device, VFIO_DEVICE_GET_IRQ_INFO, &irq);
+
+ /* Setup IRQs... eventfds, VFIO_DEVICE_SET_IRQS */
+ }
+
+ /* Gratuitous device reset and go... */
+ ioctl(device, VFIO_DEVICE_RESET);
+
+IOMMUFD and vfio_iommu_type1
+----------------------------
+
+IOMMUFD is the new user API to manage I/O page tables from userspace.
+It intends to be the portal of delivering advanced userspace DMA
+features (nested translation [5]_, PASID [6]_, etc.) while also providing
+a backwards compatibility interface for existing VFIO_TYPE1v2_IOMMU use
+cases. Eventually the vfio_iommu_type1 driver, as well as the legacy
+vfio container and group model is intended to be deprecated.
+
+The IOMMUFD backwards compatibility interface can be enabled two ways.
+In the first method, the kernel can be configured with
+CONFIG_IOMMUFD_VFIO_CONTAINER, in which case the IOMMUFD subsystem
+transparently provides the entire infrastructure for the VFIO
+container and IOMMU backend interfaces. The compatibility mode can
+also be accessed if the VFIO container interface, ie. /dev/vfio/vfio is
+simply symlink'd to /dev/iommu. Note that at the time of writing, the
+compatibility mode is not entirely feature complete relative to
+VFIO_TYPE1v2_IOMMU (ex. DMA mapping MMIO) and does not attempt to
+provide compatibility to the VFIO_SPAPR_TCE_IOMMU interface. Therefore
+it is not generally advisable at this time to switch from native VFIO
+implementations to the IOMMUFD compatibility interfaces.
+
+Long term, VFIO users should migrate to device access through the cdev
+interface described below, and native access through the IOMMUFD
+provided interfaces.
+
+VFIO Device cdev
+----------------
+
+Traditionally user acquires a device fd via VFIO_GROUP_GET_DEVICE_FD
+in a VFIO group.
+
+With CONFIG_VFIO_DEVICE_CDEV=y the user can now acquire a device fd
+by directly opening a character device /dev/vfio/devices/vfioX where
+"X" is the number allocated uniquely by VFIO for registered devices.
+cdev interface does not support noiommu devices, so user should use
+the legacy group interface if noiommu is wanted.
+
+The cdev only works with IOMMUFD. Both VFIO drivers and applications
+must adapt to the new cdev security model which requires using
+VFIO_DEVICE_BIND_IOMMUFD to claim DMA ownership before starting to
+actually use the device. Once BIND succeeds then a VFIO device can
+be fully accessed by the user.
+
+VFIO device cdev doesn't rely on VFIO group/container/iommu drivers.
+Hence those modules can be fully compiled out in an environment
+where no legacy VFIO application exists.
+
+So far SPAPR does not support IOMMUFD yet. So it cannot support device
+cdev either.
+
+vfio device cdev access is still bound by IOMMU group semantics, ie. there
+can be only one DMA owner for the group. Devices belonging to the same
+group can not be bound to multiple iommufd_ctx or shared between native
+kernel and vfio bus driver or other driver supporting the driver_managed_dma
+flag. A violation of this ownership requirement will fail at the
+VFIO_DEVICE_BIND_IOMMUFD ioctl, which gates full device access.
+
+Device cdev Example
+-------------------
+
+Assume user wants to access PCI device 0000:6a:01.0::
+
+ $ ls /sys/bus/pci/devices/0000:6a:01.0/vfio-dev/
+ vfio0
+
+This device is therefore represented as vfio0. The user can verify
+its existence::
+
+ $ ls -l /dev/vfio/devices/vfio0
+ crw------- 1 root root 511, 0 Feb 16 01:22 /dev/vfio/devices/vfio0
+ $ cat /sys/bus/pci/devices/0000:6a:01.0/vfio-dev/vfio0/dev
+ 511:0
+ $ ls -l /dev/char/511\:0
+ lrwxrwxrwx 1 root root 21 Feb 16 01:22 /dev/char/511:0 -> ../vfio/devices/vfio0
+
+Then provide the user with access to the device if unprivileged
+operation is desired::
+
+ $ chown user:user /dev/vfio/devices/vfio0
+
+Finally the user could get cdev fd by::
+
+ cdev_fd = open("/dev/vfio/devices/vfio0", O_RDWR);
+
+An opened cdev_fd doesn't give the user any permission of accessing
+the device except binding the cdev_fd to an iommufd. After that point
+then the device is fully accessible including attaching it to an
+IOMMUFD IOAS/HWPT to enable userspace DMA::
+
+ struct vfio_device_bind_iommufd bind = {
+ .argsz = sizeof(bind),
+ .flags = 0,
+ };
+ struct iommu_ioas_alloc alloc_data = {
+ .size = sizeof(alloc_data),
+ .flags = 0,
+ };
+ struct vfio_device_attach_iommufd_pt attach_data = {
+ .argsz = sizeof(attach_data),
+ .flags = 0,
+ };
+ struct iommu_ioas_map map = {
+ .size = sizeof(map),
+ .flags = IOMMU_IOAS_MAP_READABLE |
+ IOMMU_IOAS_MAP_WRITEABLE |
+ IOMMU_IOAS_MAP_FIXED_IOVA,
+ .__reserved = 0,
+ };
+
+ iommufd = open("/dev/iommu", O_RDWR);
+
+ bind.iommufd = iommufd;
+ ioctl(cdev_fd, VFIO_DEVICE_BIND_IOMMUFD, &bind);
+
+ ioctl(iommufd, IOMMU_IOAS_ALLOC, &alloc_data);
+ attach_data.pt_id = alloc_data.out_ioas_id;
+ ioctl(cdev_fd, VFIO_DEVICE_ATTACH_IOMMUFD_PT, &attach_data);
+
+ /* Allocate some space and setup a DMA mapping */
+ map.user_va = (int64_t)mmap(0, 1024 * 1024, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+ map.iova = 0; /* 1MB starting at 0x0 from device view */
+ map.length = 1024 * 1024;
+ map.ioas_id = alloc_data.out_ioas_id;;
+
+ ioctl(iommufd, IOMMU_IOAS_MAP, &map);
+
+ /* Other device operations as stated in "VFIO Usage Example" */
+
+VFIO User API
+-------------------------------------------------------------------------------
+
+Please see include/uapi/linux/vfio.h for complete API documentation.
+
+VFIO bus driver API
+-------------------------------------------------------------------------------
+
+VFIO bus drivers, such as vfio-pci make use of only a few interfaces
+into VFIO core. When devices are bound and unbound to the driver,
+Following interfaces are called when devices are bound to and
+unbound from the driver::
+
+ int vfio_register_group_dev(struct vfio_device *device);
+ int vfio_register_emulated_iommu_dev(struct vfio_device *device);
+ void vfio_unregister_group_dev(struct vfio_device *device);
+
+The driver should embed the vfio_device in its own structure and use
+vfio_alloc_device() to allocate the structure, and can register
+@init/@release callbacks to manage any private state wrapping the
+vfio_device::
+
+ vfio_alloc_device(dev_struct, member, dev, ops);
+ void vfio_put_device(struct vfio_device *device);
+
+vfio_register_group_dev() indicates to the core to begin tracking the
+iommu_group of the specified dev and register the dev as owned by a VFIO bus
+driver. Once vfio_register_group_dev() returns it is possible for userspace to
+start accessing the driver, thus the driver should ensure it is completely
+ready before calling it. The driver provides an ops structure for callbacks
+similar to a file operations structure::
+
+ struct vfio_device_ops {
+ char *name;
+ int (*init)(struct vfio_device *vdev);
+ void (*release)(struct vfio_device *vdev);
+ int (*bind_iommufd)(struct vfio_device *vdev,
+ struct iommufd_ctx *ictx, u32 *out_device_id);
+ void (*unbind_iommufd)(struct vfio_device *vdev);
+ int (*attach_ioas)(struct vfio_device *vdev, u32 *pt_id);
+ void (*detach_ioas)(struct vfio_device *vdev);
+ int (*open_device)(struct vfio_device *vdev);
+ void (*close_device)(struct vfio_device *vdev);
+ ssize_t (*read)(struct vfio_device *vdev, char __user *buf,
+ size_t count, loff_t *ppos);
+ ssize_t (*write)(struct vfio_device *vdev, const char __user *buf,
+ size_t count, loff_t *size);
+ long (*ioctl)(struct vfio_device *vdev, unsigned int cmd,
+ unsigned long arg);
+ int (*mmap)(struct vfio_device *vdev, struct vm_area_struct *vma);
+ void (*request)(struct vfio_device *vdev, unsigned int count);
+ int (*match)(struct vfio_device *vdev, char *buf);
+ void (*dma_unmap)(struct vfio_device *vdev, u64 iova, u64 length);
+ int (*device_feature)(struct vfio_device *device, u32 flags,
+ void __user *arg, size_t argsz);
+ };
+
+Each function is passed the vdev that was originally registered
+in the vfio_register_group_dev() or vfio_register_emulated_iommu_dev()
+call above. This allows the bus driver to obtain its private data using
+container_of().
+
+::
+
+ - The init/release callbacks are issued when vfio_device is initialized
+ and released.
+
+ - The open/close device callbacks are issued when the first
+ instance of a file descriptor for the device is created (eg.
+ via VFIO_GROUP_GET_DEVICE_FD) for a user session.
+
+ - The ioctl callback provides a direct pass through for some VFIO_DEVICE_*
+ ioctls.
+
+ - The [un]bind_iommufd callbacks are issued when the device is bound to
+ and unbound from iommufd.
+
+ - The [de]attach_ioas callback is issued when the device is attached to
+ and detached from an IOAS managed by the bound iommufd. However, the
+ attached IOAS can also be automatically detached when the device is
+ unbound from iommufd.
+
+ - The read/write/mmap callbacks implement the device region access defined
+ by the device's own VFIO_DEVICE_GET_REGION_INFO ioctl.
+
+ - The request callback is issued when device is going to be unregistered,
+ such as when trying to unbind the device from the vfio bus driver.
+
+ - The dma_unmap callback is issued when a range of iovas are unmapped
+ in the container or IOAS attached by the device. Drivers which make
+ use of the vfio page pinning interface must implement this callback in
+ order to unpin pages within the dma_unmap range. Drivers must tolerate
+ this callback even before calls to open_device().
+
+PPC64 sPAPR implementation note
+-------------------------------
+
+This implementation has some specifics:
+
+1) On older systems (POWER7 with P5IOC2/IODA1) only one IOMMU group per
+ container is supported as an IOMMU table is allocated at the boot time,
+ one table per a IOMMU group which is a Partitionable Endpoint (PE)
+ (PE is often a PCI domain but not always).
+
+ Newer systems (POWER8 with IODA2) have improved hardware design which allows
+ to remove this limitation and have multiple IOMMU groups per a VFIO
+ container.
+
+2) The hardware supports so called DMA windows - the PCI address range
+ within which DMA transfer is allowed, any attempt to access address space
+ out of the window leads to the whole PE isolation.
+
+3) PPC64 guests are paravirtualized but not fully emulated. There is an API
+ to map/unmap pages for DMA, and it normally maps 1..32 pages per call and
+ currently there is no way to reduce the number of calls. In order to make
+ things faster, the map/unmap handling has been implemented in real mode
+ which provides an excellent performance which has limitations such as
+ inability to do locked pages accounting in real time.
+
+4) According to sPAPR specification, A Partitionable Endpoint (PE) is an I/O
+ subtree that can be treated as a unit for the purposes of partitioning and
+ error recovery. A PE may be a single or multi-function IOA (IO Adapter), a
+ function of a multi-function IOA, or multiple IOAs (possibly including
+ switch and bridge structures above the multiple IOAs). PPC64 guests detect
+ PCI errors and recover from them via EEH RTAS services, which works on the
+ basis of additional ioctl commands.
+
+ So 4 additional ioctls have been added:
+
+ VFIO_IOMMU_SPAPR_TCE_GET_INFO
+ returns the size and the start of the DMA window on the PCI bus.
+
+ VFIO_IOMMU_ENABLE
+ enables the container. The locked pages accounting
+ is done at this point. This lets user first to know what
+ the DMA window is and adjust rlimit before doing any real job.
+
+ VFIO_IOMMU_DISABLE
+ disables the container.
+
+ VFIO_EEH_PE_OP
+ provides an API for EEH setup, error detection and recovery.
+
+ The code flow from the example above should be slightly changed::
+
+ struct vfio_eeh_pe_op pe_op = { .argsz = sizeof(pe_op), .flags = 0 };
+
+ .....
+ /* Add the group to the container */
+ ioctl(group, VFIO_GROUP_SET_CONTAINER, &container);
+
+ /* Enable the IOMMU model we want */
+ ioctl(container, VFIO_SET_IOMMU, VFIO_SPAPR_TCE_IOMMU)
+
+ /* Get addition sPAPR IOMMU info */
+ vfio_iommu_spapr_tce_info spapr_iommu_info;
+ ioctl(container, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &spapr_iommu_info);
+
+ if (ioctl(container, VFIO_IOMMU_ENABLE))
+ /* Cannot enable container, may be low rlimit */
+
+ /* Allocate some space and setup a DMA mapping */
+ dma_map.vaddr = mmap(0, 1024 * 1024, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+
+ dma_map.size = 1024 * 1024;
+ dma_map.iova = 0; /* 1MB starting at 0x0 from device view */
+ dma_map.flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE;
+
+ /* Check here is .iova/.size are within DMA window from spapr_iommu_info */
+ ioctl(container, VFIO_IOMMU_MAP_DMA, &dma_map);
+
+ /* Get a file descriptor for the device */
+ device = ioctl(group, VFIO_GROUP_GET_DEVICE_FD, "0000:06:0d.0");
+
+ ....
+
+ /* Gratuitous device reset and go... */
+ ioctl(device, VFIO_DEVICE_RESET);
+
+ /* Make sure EEH is supported */
+ ioctl(container, VFIO_CHECK_EXTENSION, VFIO_EEH);
+
+ /* Enable the EEH functionality on the device */
+ pe_op.op = VFIO_EEH_PE_ENABLE;
+ ioctl(container, VFIO_EEH_PE_OP, &pe_op);
+
+ /* You're suggested to create additional data struct to represent
+ * PE, and put child devices belonging to same IOMMU group to the
+ * PE instance for later reference.
+ */
+
+ /* Check the PE's state and make sure it's in functional state */
+ pe_op.op = VFIO_EEH_PE_GET_STATE;
+ ioctl(container, VFIO_EEH_PE_OP, &pe_op);
+
+ /* Save device state using pci_save_state().
+ * EEH should be enabled on the specified device.
+ */
+
+ ....
+
+ /* Inject EEH error, which is expected to be caused by 32-bits
+ * config load.
+ */
+ pe_op.op = VFIO_EEH_PE_INJECT_ERR;
+ pe_op.err.type = EEH_ERR_TYPE_32;
+ pe_op.err.func = EEH_ERR_FUNC_LD_CFG_ADDR;
+ pe_op.err.addr = 0ul;
+ pe_op.err.mask = 0ul;
+ ioctl(container, VFIO_EEH_PE_OP, &pe_op);
+
+ ....
+
+ /* When 0xFF's returned from reading PCI config space or IO BARs
+ * of the PCI device. Check the PE's state to see if that has been
+ * frozen.
+ */
+ ioctl(container, VFIO_EEH_PE_OP, &pe_op);
+
+ /* Waiting for pending PCI transactions to be completed and don't
+ * produce any more PCI traffic from/to the affected PE until
+ * recovery is finished.
+ */
+
+ /* Enable IO for the affected PE and collect logs. Usually, the
+ * standard part of PCI config space, AER registers are dumped
+ * as logs for further analysis.
+ */
+ pe_op.op = VFIO_EEH_PE_UNFREEZE_IO;
+ ioctl(container, VFIO_EEH_PE_OP, &pe_op);
+
+ /*
+ * Issue PE reset: hot or fundamental reset. Usually, hot reset
+ * is enough. However, the firmware of some PCI adapters would
+ * require fundamental reset.
+ */
+ pe_op.op = VFIO_EEH_PE_RESET_HOT;
+ ioctl(container, VFIO_EEH_PE_OP, &pe_op);
+ pe_op.op = VFIO_EEH_PE_RESET_DEACTIVATE;
+ ioctl(container, VFIO_EEH_PE_OP, &pe_op);
+
+ /* Configure the PCI bridges for the affected PE */
+ pe_op.op = VFIO_EEH_PE_CONFIGURE;
+ ioctl(container, VFIO_EEH_PE_OP, &pe_op);
+
+ /* Restored state we saved at initialization time. pci_restore_state()
+ * is good enough as an example.
+ */
+
+ /* Hopefully, error is recovered successfully. Now, you can resume to
+ * start PCI traffic to/from the affected PE.
+ */
+
+ ....
+
+5) There is v2 of SPAPR TCE IOMMU. It deprecates VFIO_IOMMU_ENABLE/
+ VFIO_IOMMU_DISABLE and implements 2 new ioctls:
+ VFIO_IOMMU_SPAPR_REGISTER_MEMORY and VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY
+ (which are unsupported in v1 IOMMU).
+
+ PPC64 paravirtualized guests generate a lot of map/unmap requests,
+ and the handling of those includes pinning/unpinning pages and updating
+ mm::locked_vm counter to make sure we do not exceed the rlimit.
+ The v2 IOMMU splits accounting and pinning into separate operations:
+
+ - VFIO_IOMMU_SPAPR_REGISTER_MEMORY/VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY ioctls
+ receive a user space address and size of the block to be pinned.
+ Bisecting is not supported and VFIO_IOMMU_UNREGISTER_MEMORY is expected to
+ be called with the exact address and size used for registering
+ the memory block. The userspace is not expected to call these often.
+ The ranges are stored in a linked list in a VFIO container.
+
+ - VFIO_IOMMU_MAP_DMA/VFIO_IOMMU_UNMAP_DMA ioctls only update the actual
+ IOMMU table and do not do pinning; instead these check that the userspace
+ address is from pre-registered range.
+
+ This separation helps in optimizing DMA for guests.
+
+6) sPAPR specification allows guests to have an additional DMA window(s) on
+ a PCI bus with a variable page size. Two ioctls have been added to support
+ this: VFIO_IOMMU_SPAPR_TCE_CREATE and VFIO_IOMMU_SPAPR_TCE_REMOVE.
+ The platform has to support the functionality or error will be returned to
+ the userspace. The existing hardware supports up to 2 DMA windows, one is
+ 2GB long, uses 4K pages and called "default 32bit window"; the other can
+ be as big as entire RAM, use different page size, it is optional - guests
+ create those in run-time if the guest driver supports 64bit DMA.
+
+ VFIO_IOMMU_SPAPR_TCE_CREATE receives a page shift, a DMA window size and
+ a number of TCE table levels (if a TCE table is going to be big enough and
+ the kernel may not be able to allocate enough of physically contiguous
+ memory). It creates a new window in the available slot and returns the bus
+ address where the new window starts. Due to hardware limitation, the user
+ space cannot choose the location of DMA windows.
+
+ VFIO_IOMMU_SPAPR_TCE_REMOVE receives the bus start address of the window
+ and removes it.
+
+-------------------------------------------------------------------------------
+
+.. [1] VFIO was originally an acronym for "Virtual Function I/O" in its
+ initial implementation by Tom Lyon while as Cisco. We've since
+ outgrown the acronym, but it's catchy.
+
+.. [2] "safe" also depends upon a device being "well behaved". It's
+ possible for multi-function devices to have backdoors between
+ functions and even for single function devices to have alternative
+ access to things like PCI config space through MMIO registers. To
+ guard against the former we can include additional precautions in the
+ IOMMU driver to group multi-function PCI devices together
+ (iommu=group_mf). The latter we can't prevent, but the IOMMU should
+ still provide isolation. For PCI, SR-IOV Virtual Functions are the
+ best indicator of "well behaved", as these are designed for
+ virtualization usage models.
+
+.. [3] As always there are trade-offs to virtual machine device
+ assignment that are beyond the scope of VFIO. It's expected that
+ future IOMMU technologies will reduce some, but maybe not all, of
+ these trade-offs.
+
+.. [4] In this case the device is below a PCI bridge, so transactions
+ from either function of the device are indistinguishable to the iommu::
+
+ -[0000:00]-+-1e.0-[06]--+-0d.0
+ \-0d.1
+
+ 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 90)
+
+.. [5] Nested translation is an IOMMU feature which supports two stage
+ address translations. This improves the address translation efficiency
+ in IOMMU virtualization.
+
+.. [6] PASID stands for Process Address Space ID, introduced by PCI
+ Express. It is a prerequisite for Shared Virtual Addressing (SVA)
+ and Scalable I/O Virtualization (Scalable IOV).
diff --git a/Documentation/driver-api/virtio/index.rst b/Documentation/driver-api/virtio/index.rst
new file mode 100644
index 0000000000..528b14b291
--- /dev/null
+++ b/Documentation/driver-api/virtio/index.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+======
+Virtio
+======
+
+.. toctree::
+ :maxdepth: 1
+
+ virtio
+ writing_virtio_drivers
diff --git a/Documentation/driver-api/virtio/virtio.rst b/Documentation/driver-api/virtio/virtio.rst
new file mode 100644
index 0000000000..7947b4ca69
--- /dev/null
+++ b/Documentation/driver-api/virtio/virtio.rst
@@ -0,0 +1,145 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. _virtio:
+
+===============
+Virtio on Linux
+===============
+
+Introduction
+============
+
+Virtio is an open standard that defines a protocol for communication
+between drivers and devices of different types, see Chapter 5 ("Device
+Types") of the virtio spec (`[1]`_). Originally developed as a standard
+for paravirtualized devices implemented by a hypervisor, it can be used
+to interface any compliant device (real or emulated) with a driver.
+
+For illustrative purposes, this document will focus on the common case
+of a Linux kernel running in a virtual machine and using paravirtualized
+devices provided by the hypervisor, which exposes them as virtio devices
+via standard mechanisms such as PCI.
+
+
+Device - Driver communication: virtqueues
+=========================================
+
+Although the virtio devices are really an abstraction layer in the
+hypervisor, they're exposed to the guest as if they are physical devices
+using a specific transport method -- PCI, MMIO or CCW -- that is
+orthogonal to the device itself. The virtio spec defines these transport
+methods in detail, including device discovery, capabilities and
+interrupt handling.
+
+The communication between the driver in the guest OS and the device in
+the hypervisor is done through shared memory (that's what makes virtio
+devices so efficient) using specialized data structures called
+virtqueues, which are actually ring buffers [#f1]_ of buffer descriptors
+similar to the ones used in a network device:
+
+.. kernel-doc:: include/uapi/linux/virtio_ring.h
+ :identifiers: struct vring_desc
+
+All the buffers the descriptors point to are allocated by the guest and
+used by the host either for reading or for writing but not for both.
+
+Refer to Chapter 2.5 ("Virtqueues") of the virtio spec (`[1]`_) for the
+reference definitions of virtqueues and "Virtqueues and virtio ring: How
+the data travels" blog post (`[2]`_) for an illustrated overview of how
+the host device and the guest driver communicate.
+
+The :c:type:`vring_virtqueue` struct models a virtqueue, including the
+ring buffers and management data. Embedded in this struct is the
+:c:type:`virtqueue` struct, which is the data structure that's
+ultimately used by virtio drivers:
+
+.. kernel-doc:: include/linux/virtio.h
+ :identifiers: struct virtqueue
+
+The callback function pointed by this struct is triggered when the
+device has consumed the buffers provided by the driver. More
+specifically, the trigger will be an interrupt issued by the hypervisor
+(see vring_interrupt()). Interrupt request handlers are registered for
+a virtqueue during the virtqueue setup process (transport-specific).
+
+.. kernel-doc:: drivers/virtio/virtio_ring.c
+ :identifiers: vring_interrupt
+
+
+Device discovery and probing
+============================
+
+In the kernel, the virtio core contains the virtio bus driver and
+transport-specific drivers like `virtio-pci` and `virtio-mmio`. Then
+there are individual virtio drivers for specific device types that are
+registered to the virtio bus driver.
+
+How a virtio device is found and configured by the kernel depends on how
+the hypervisor defines it. Taking the `QEMU virtio-console
+<https://gitlab.com/qemu-project/qemu/-/blob/master/hw/char/virtio-console.c>`__
+device as an example. When using PCI as a transport method, the device
+will present itself on the PCI bus with vendor 0x1af4 (Red Hat, Inc.)
+and device id 0x1003 (virtio console), as defined in the spec, so the
+kernel will detect it as it would do with any other PCI device.
+
+During the PCI enumeration process, if a device is found to match the
+virtio-pci driver (according to the virtio-pci device table, any PCI
+device with vendor id = 0x1af4)::
+
+ /* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
+ static const struct pci_device_id virtio_pci_id_table[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) },
+ { 0 }
+ };
+
+then the virtio-pci driver is probed and, if the probing goes well, the
+device is registered to the virtio bus::
+
+ static int virtio_pci_probe(struct pci_dev *pci_dev,
+ const struct pci_device_id *id)
+ {
+ ...
+
+ if (force_legacy) {
+ rc = virtio_pci_legacy_probe(vp_dev);
+ /* Also try modern mode if we can't map BAR0 (no IO space). */
+ if (rc == -ENODEV || rc == -ENOMEM)
+ rc = virtio_pci_modern_probe(vp_dev);
+ if (rc)
+ goto err_probe;
+ } else {
+ rc = virtio_pci_modern_probe(vp_dev);
+ if (rc == -ENODEV)
+ rc = virtio_pci_legacy_probe(vp_dev);
+ if (rc)
+ goto err_probe;
+ }
+
+ ...
+
+ rc = register_virtio_device(&vp_dev->vdev);
+
+When the device is registered to the virtio bus the kernel will look
+for a driver in the bus that can handle the device and call that
+driver's ``probe`` method.
+
+At this point, the virtqueues will be allocated and configured by
+calling the appropriate ``virtio_find`` helper function, such as
+virtio_find_single_vq() or virtio_find_vqs(), which will end up calling
+a transport-specific ``find_vqs`` method.
+
+
+References
+==========
+
+_`[1]` Virtio Spec v1.2:
+https://docs.oasis-open.org/virtio/virtio/v1.2/virtio-v1.2.html
+
+.. Check for later versions of the spec as well.
+
+_`[2]` Virtqueues and virtio ring: How the data travels
+https://www.redhat.com/en/blog/virtqueues-and-virtio-ring-how-data-travels
+
+.. rubric:: Footnotes
+
+.. [#f1] that's why they may be also referred to as virtrings.
diff --git a/Documentation/driver-api/virtio/writing_virtio_drivers.rst b/Documentation/driver-api/virtio/writing_virtio_drivers.rst
new file mode 100644
index 0000000000..e14c58796d
--- /dev/null
+++ b/Documentation/driver-api/virtio/writing_virtio_drivers.rst
@@ -0,0 +1,197 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. _writing_virtio_drivers:
+
+======================
+Writing Virtio Drivers
+======================
+
+Introduction
+============
+
+This document serves as a basic guideline for driver programmers that
+need to hack a new virtio driver or understand the essentials of the
+existing ones. See :ref:`Virtio on Linux <virtio>` for a general
+overview of virtio.
+
+
+Driver boilerplate
+==================
+
+As a bare minimum, a virtio driver needs to register in the virtio bus
+and configure the virtqueues for the device according to its spec, the
+configuration of the virtqueues in the driver side must match the
+virtqueue definitions in the device. A basic driver skeleton could look
+like this::
+
+ #include <linux/virtio.h>
+ #include <linux/virtio_ids.h>
+ #include <linux/virtio_config.h>
+ #include <linux/module.h>
+
+ /* device private data (one per device) */
+ struct virtio_dummy_dev {
+ struct virtqueue *vq;
+ };
+
+ static void virtio_dummy_recv_cb(struct virtqueue *vq)
+ {
+ struct virtio_dummy_dev *dev = vq->vdev->priv;
+ char *buf;
+ unsigned int len;
+
+ while ((buf = virtqueue_get_buf(dev->vq, &len)) != NULL) {
+ /* process the received data */
+ }
+ }
+
+ static int virtio_dummy_probe(struct virtio_device *vdev)
+ {
+ struct virtio_dummy_dev *dev = NULL;
+
+ /* initialize device data */
+ dev = kzalloc(sizeof(struct virtio_dummy_dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ /* the device has a single virtqueue */
+ dev->vq = virtio_find_single_vq(vdev, virtio_dummy_recv_cb, "input");
+ if (IS_ERR(dev->vq)) {
+ kfree(dev);
+ return PTR_ERR(dev->vq);
+
+ }
+ vdev->priv = dev;
+
+ /* from this point on, the device can notify and get callbacks */
+ virtio_device_ready(vdev);
+
+ return 0;
+ }
+
+ static void virtio_dummy_remove(struct virtio_device *vdev)
+ {
+ struct virtio_dummy_dev *dev = vdev->priv;
+
+ /*
+ * disable vq interrupts: equivalent to
+ * vdev->config->reset(vdev)
+ */
+ virtio_reset_device(vdev);
+
+ /* detach unused buffers */
+ while ((buf = virtqueue_detach_unused_buf(dev->vq)) != NULL) {
+ kfree(buf);
+ }
+
+ /* remove virtqueues */
+ vdev->config->del_vqs(vdev);
+
+ kfree(dev);
+ }
+
+ static const struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_DUMMY, VIRTIO_DEV_ANY_ID },
+ { 0 },
+ };
+
+ static struct virtio_driver virtio_dummy_driver = {
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = virtio_dummy_probe,
+ .remove = virtio_dummy_remove,
+ };
+
+ module_virtio_driver(virtio_dummy_driver);
+ MODULE_DEVICE_TABLE(virtio, id_table);
+ MODULE_DESCRIPTION("Dummy virtio driver");
+ MODULE_LICENSE("GPL");
+
+The device id ``VIRTIO_ID_DUMMY`` here is a placeholder, virtio drivers
+should be added only for devices that are defined in the spec, see
+include/uapi/linux/virtio_ids.h. Device ids need to be at least reserved
+in the virtio spec before being added to that file.
+
+If your driver doesn't have to do anything special in its ``init`` and
+``exit`` methods, you can use the module_virtio_driver() helper to
+reduce the amount of boilerplate code.
+
+The ``probe`` method does the minimum driver setup in this case
+(memory allocation for the device data) and initializes the
+virtqueue. virtio_device_ready() is used to enable the virtqueue and to
+notify the device that the driver is ready to manage the device
+("DRIVER_OK"). The virtqueues are anyway enabled automatically by the
+core after ``probe`` returns.
+
+.. kernel-doc:: include/linux/virtio_config.h
+ :identifiers: virtio_device_ready
+
+In any case, the virtqueues need to be enabled before adding buffers to
+them.
+
+Sending and receiving data
+==========================
+
+The virtio_dummy_recv_cb() callback in the code above will be triggered
+when the device notifies the driver after it finishes processing a
+descriptor or descriptor chain, either for reading or writing. However,
+that's only the second half of the virtio device-driver communication
+process, as the communication is always started by the driver regardless
+of the direction of the data transfer.
+
+To configure a buffer transfer from the driver to the device, first you
+have to add the buffers -- packed as `scatterlists` -- to the
+appropriate virtqueue using any of the virtqueue_add_inbuf(),
+virtqueue_add_outbuf() or virtqueue_add_sgs(), depending on whether you
+need to add one input `scatterlist` (for the device to fill in), one
+output `scatterlist` (for the device to consume) or multiple
+`scatterlists`, respectively. Then, once the virtqueue is set up, a call
+to virtqueue_kick() sends a notification that will be serviced by the
+hypervisor that implements the device::
+
+ struct scatterlist sg[1];
+ sg_init_one(sg, buffer, BUFLEN);
+ virtqueue_add_inbuf(dev->vq, sg, 1, buffer, GFP_ATOMIC);
+ virtqueue_kick(dev->vq);
+
+.. kernel-doc:: drivers/virtio/virtio_ring.c
+ :identifiers: virtqueue_add_inbuf
+
+.. kernel-doc:: drivers/virtio/virtio_ring.c
+ :identifiers: virtqueue_add_outbuf
+
+.. kernel-doc:: drivers/virtio/virtio_ring.c
+ :identifiers: virtqueue_add_sgs
+
+Then, after the device has read or written the buffers prepared by the
+driver and notifies it back, the driver can call virtqueue_get_buf() to
+read the data produced by the device (if the virtqueue was set up with
+input buffers) or simply to reclaim the buffers if they were already
+consumed by the device:
+
+.. kernel-doc:: drivers/virtio/virtio_ring.c
+ :identifiers: virtqueue_get_buf_ctx
+
+The virtqueue callbacks can be disabled and re-enabled using the
+virtqueue_disable_cb() and the family of virtqueue_enable_cb() functions
+respectively. See drivers/virtio/virtio_ring.c for more details:
+
+.. kernel-doc:: drivers/virtio/virtio_ring.c
+ :identifiers: virtqueue_disable_cb
+
+.. kernel-doc:: drivers/virtio/virtio_ring.c
+ :identifiers: virtqueue_enable_cb
+
+But note that some spurious callbacks can still be triggered under
+certain scenarios. The way to disable callbacks reliably is to reset the
+device or the virtqueue (virtio_reset_device()).
+
+
+References
+==========
+
+_`[1]` Virtio Spec v1.2:
+https://docs.oasis-open.org/virtio/virtio/v1.2/virtio-v1.2.html
+
+Check for later versions of the spec as well.
diff --git a/Documentation/driver-api/vme.rst b/Documentation/driver-api/vme.rst
new file mode 100644
index 0000000000..c0b475369d
--- /dev/null
+++ b/Documentation/driver-api/vme.rst
@@ -0,0 +1,297 @@
+VME Device Drivers
+==================
+
+Driver registration
+-------------------
+
+As with other subsystems within the Linux kernel, VME device drivers register
+with the VME subsystem, typically called from the devices init routine. This is
+achieved via a call to :c:func:`vme_register_driver`.
+
+A pointer to a structure of type :c:type:`struct vme_driver <vme_driver>` must
+be provided to the registration function. Along with the maximum number of
+devices your driver is able to support.
+
+At the minimum, the '.name', '.match' and '.probe' elements of
+:c:type:`struct vme_driver <vme_driver>` should be correctly set. The '.name'
+element is a pointer to a string holding the device driver's name.
+
+The '.match' function allows control over which VME devices should be registered
+with the driver. The match function should return 1 if a device should be
+probed and 0 otherwise. This example match function (from vme_user.c) limits
+the number of devices probed to one:
+
+.. code-block:: c
+
+ #define USER_BUS_MAX 1
+ ...
+ static int vme_user_match(struct vme_dev *vdev)
+ {
+ if (vdev->id.num >= USER_BUS_MAX)
+ return 0;
+ return 1;
+ }
+
+The '.probe' element should contain a pointer to the probe routine. The
+probe routine is passed a :c:type:`struct vme_dev <vme_dev>` pointer as an
+argument.
+
+Here, the 'num' field refers to the sequential device ID for this specific
+driver. The bridge number (or bus number) can be accessed using
+dev->bridge->num.
+
+A function is also provided to unregister the driver from the VME core called
+:c:func:`vme_unregister_driver` and should usually be called from the device
+driver's exit routine.
+
+
+Resource management
+-------------------
+
+Once a driver has registered with the VME core the provided match routine will
+be called the number of times specified during the registration. If a match
+succeeds, a non-zero value should be returned. A zero return value indicates
+failure. For all successful matches, the probe routine of the corresponding
+driver is called. The probe routine is passed a pointer to the devices
+device structure. This pointer should be saved, it will be required for
+requesting VME resources.
+
+The driver can request ownership of one or more master windows
+(:c:func:`vme_master_request`), slave windows (:c:func:`vme_slave_request`)
+and/or dma channels (:c:func:`vme_dma_request`). Rather than allowing the device
+driver to request a specific window or DMA channel (which may be used by a
+different driver) the API allows a resource to be assigned based on the required
+attributes of the driver in question. For slave windows these attributes are
+split into the VME address spaces that need to be accessed in 'aspace' and VME
+bus cycle types required in 'cycle'. Master windows add a further set of
+attributes in 'width' specifying the required data transfer widths. These
+attributes are defined as bitmasks and as such any combination of the
+attributes can be requested for a single window, the core will assign a window
+that meets the requirements, returning a pointer of type vme_resource that
+should be used to identify the allocated resource when it is used. For DMA
+controllers, the request function requires the potential direction of any
+transfers to be provided in the route attributes. This is typically VME-to-MEM
+and/or MEM-to-VME, though some hardware can support VME-to-VME and MEM-to-MEM
+transfers as well as test pattern generation. If an unallocated window fitting
+the requirements can not be found a NULL pointer will be returned.
+
+Functions are also provided to free window allocations once they are no longer
+required. These functions (:c:func:`vme_master_free`, :c:func:`vme_slave_free`
+and :c:func:`vme_dma_free`) should be passed the pointer to the resource
+provided during resource allocation.
+
+
+Master windows
+--------------
+
+Master windows provide access from the local processor[s] out onto the VME bus.
+The number of windows available and the available access modes is dependent on
+the underlying chipset. A window must be configured before it can be used.
+
+
+Master window configuration
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Once a master window has been assigned :c:func:`vme_master_set` can be used to
+configure it and :c:func:`vme_master_get` to retrieve the current settings. The
+address spaces, transfer widths and cycle types are the same as described
+under resource management, however some of the options are mutually exclusive.
+For example, only one address space may be specified.
+
+
+Master window access
+~~~~~~~~~~~~~~~~~~~~
+
+The function :c:func:`vme_master_read` can be used to read from and
+:c:func:`vme_master_write` used to write to configured master windows.
+
+In addition to simple reads and writes, :c:func:`vme_master_rmw` is provided to
+do a read-modify-write transaction. Parts of a VME window can also be mapped
+into user space memory using :c:func:`vme_master_mmap`.
+
+
+Slave windows
+-------------
+
+Slave windows provide devices on the VME bus access into mapped portions of the
+local memory. The number of windows available and the access modes that can be
+used is dependent on the underlying chipset. A window must be configured before
+it can be used.
+
+
+Slave window configuration
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Once a slave window has been assigned :c:func:`vme_slave_set` can be used to
+configure it and :c:func:`vme_slave_get` to retrieve the current settings.
+
+The address spaces, transfer widths and cycle types are the same as described
+under resource management, however some of the options are mutually exclusive.
+For example, only one address space may be specified.
+
+
+Slave window buffer allocation
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Functions are provided to allow the user to allocate
+(:c:func:`vme_alloc_consistent`) and free (:c:func:`vme_free_consistent`)
+contiguous buffers which will be accessible by the VME bridge. These functions
+do not have to be used, other methods can be used to allocate a buffer, though
+care must be taken to ensure that they are contiguous and accessible by the VME
+bridge.
+
+
+Slave window access
+~~~~~~~~~~~~~~~~~~~
+
+Slave windows map local memory onto the VME bus, the standard methods for
+accessing memory should be used.
+
+
+DMA channels
+------------
+
+The VME DMA transfer provides the ability to run link-list DMA transfers. The
+API introduces the concept of DMA lists. Each DMA list is a link-list which can
+be passed to a DMA controller. Multiple lists can be created, extended,
+executed, reused and destroyed.
+
+
+List Management
+~~~~~~~~~~~~~~~
+
+The function :c:func:`vme_new_dma_list` is provided to create and
+:c:func:`vme_dma_list_free` to destroy DMA lists. Execution of a list will not
+automatically destroy the list, thus enabling a list to be reused for repetitive
+tasks.
+
+
+List Population
+~~~~~~~~~~~~~~~
+
+An item can be added to a list using :c:func:`vme_dma_list_add` (the source and
+destination attributes need to be created before calling this function, this is
+covered under "Transfer Attributes").
+
+.. note::
+
+ The detailed attributes of the transfers source and destination
+ are not checked until an entry is added to a DMA list, the request
+ for a DMA channel purely checks the directions in which the
+ controller is expected to transfer data. As a result it is
+ possible for this call to return an error, for example if the
+ source or destination is in an unsupported VME address space.
+
+Transfer Attributes
+~~~~~~~~~~~~~~~~~~~
+
+The attributes for the source and destination are handled separately from adding
+an item to a list. This is due to the diverse attributes required for each type
+of source and destination. There are functions to create attributes for PCI, VME
+and pattern sources and destinations (where appropriate):
+
+ - PCI source or destination: :c:func:`vme_dma_pci_attribute`
+ - VME source or destination: :c:func:`vme_dma_vme_attribute`
+ - Pattern source: :c:func:`vme_dma_pattern_attribute`
+
+The function :c:func:`vme_dma_free_attribute` should be used to free an
+attribute.
+
+
+List Execution
+~~~~~~~~~~~~~~
+
+The function :c:func:`vme_dma_list_exec` queues a list for execution and will
+return once the list has been executed.
+
+
+Interrupts
+----------
+
+The VME API provides functions to attach and detach callbacks to specific VME
+level and status ID combinations and for the generation of VME interrupts with
+specific VME level and status IDs.
+
+
+Attaching Interrupt Handlers
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The function :c:func:`vme_irq_request` can be used to attach and
+:c:func:`vme_irq_free` to free a specific VME level and status ID combination.
+Any given combination can only be assigned a single callback function. A void
+pointer parameter is provided, the value of which is passed to the callback
+function, the use of this pointer is user undefined. The callback parameters are
+as follows. Care must be taken in writing a callback function, callback
+functions run in interrupt context:
+
+.. code-block:: c
+
+ void callback(int level, int statid, void *priv);
+
+
+Interrupt Generation
+~~~~~~~~~~~~~~~~~~~~
+
+The function :c:func:`vme_irq_generate` can be used to generate a VME interrupt
+at a given VME level and VME status ID.
+
+
+Location monitors
+-----------------
+
+The VME API provides the following functionality to configure the location
+monitor.
+
+
+Location Monitor Management
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The function :c:func:`vme_lm_request` is provided to request the use of a block
+of location monitors and :c:func:`vme_lm_free` to free them after they are no
+longer required. Each block may provide a number of location monitors,
+monitoring adjacent locations. The function :c:func:`vme_lm_count` can be used
+to determine how many locations are provided.
+
+
+Location Monitor Configuration
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Once a bank of location monitors has been allocated, the function
+:c:func:`vme_lm_set` is provided to configure the location and mode of the
+location monitor. The function :c:func:`vme_lm_get` can be used to retrieve
+existing settings.
+
+
+Location Monitor Use
+~~~~~~~~~~~~~~~~~~~~
+
+The function :c:func:`vme_lm_attach` enables a callback to be attached and
+:c:func:`vme_lm_detach` allows on to be detached from each location monitor
+location. Each location monitor can monitor a number of adjacent locations. The
+callback function is declared as follows.
+
+.. code-block:: c
+
+ void callback(void *data);
+
+
+Slot Detection
+--------------
+
+The function :c:func:`vme_slot_num` returns the slot ID of the provided bridge.
+
+
+Bus Detection
+-------------
+
+The function :c:func:`vme_bus_num` returns the bus ID of the provided bridge.
+
+
+VME API
+-------
+
+.. kernel-doc:: drivers/staging/vme_user/vme.h
+ :internal:
+
+.. kernel-doc:: drivers/staging/vme_user/vme.c
+ :export:
diff --git a/Documentation/driver-api/w1.rst b/Documentation/driver-api/w1.rst
new file mode 100644
index 0000000000..bda3ad60f6
--- /dev/null
+++ b/Documentation/driver-api/w1.rst
@@ -0,0 +1,67 @@
+======================
+W1: Dallas' 1-wire bus
+======================
+
+:Author: David Fries
+
+W1 API internal to the kernel
+=============================
+
+include/linux/w1.h
+~~~~~~~~~~~~~~~~~~
+
+W1 kernel API functions.
+
+.. kernel-doc:: include/linux/w1.h
+ :internal:
+
+drivers/w1/w1.c
+~~~~~~~~~~~~~~~
+
+W1 core functions.
+
+.. kernel-doc:: drivers/w1/w1.c
+ :internal:
+
+drivers/w1/w1_family.c
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Allows registering device family operations.
+
+.. kernel-doc:: drivers/w1/w1_family.c
+ :export:
+
+drivers/w1/w1_internal.h
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+W1 internal initialization for master devices.
+
+.. kernel-doc:: drivers/w1/w1_internal.h
+ :internal:
+
+drivers/w1/w1_int.c
+~~~~~~~~~~~~~~~~~~~~
+
+W1 internal initialization for master devices.
+
+.. kernel-doc:: drivers/w1/w1_int.c
+ :export:
+
+drivers/w1/w1_netlink.h
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+W1 external netlink API structures and commands.
+
+.. kernel-doc:: drivers/w1/w1_netlink.h
+ :internal:
+
+drivers/w1/w1_io.c
+~~~~~~~~~~~~~~~~~~~
+
+W1 input/output.
+
+.. kernel-doc:: drivers/w1/w1_io.c
+ :export:
+
+.. kernel-doc:: drivers/w1/w1_io.c
+ :internal:
diff --git a/Documentation/driver-api/wmi.rst b/Documentation/driver-api/wmi.rst
new file mode 100644
index 0000000000..6ca58c8249
--- /dev/null
+++ b/Documentation/driver-api/wmi.rst
@@ -0,0 +1,21 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+==============
+WMI Driver API
+==============
+
+The WMI driver core supports a more modern bus-based interface for interacting
+with WMI devices, and an older GUID-based interface. The latter interface is
+considered to be deprecated, so new WMI drivers should generally avoid it since
+it has some issues with multiple WMI devices and events sharing the same GUIDs
+and/or notification IDs. The modern bus-based interface instead maps each
+WMI device to a :c:type:`struct wmi_device <wmi_device>`, so it supports
+WMI devices sharing GUIDs and/or notification IDs. Drivers can then register
+a :c:type:`struct wmi_driver <wmi_driver>`, which will be bound to compatible
+WMI devices by the driver core.
+
+.. kernel-doc:: include/linux/wmi.h
+ :internal:
+
+.. kernel-doc:: drivers/platform/x86/wmi.c
+ :export:
diff --git a/Documentation/driver-api/xilinx/eemi.rst b/Documentation/driver-api/xilinx/eemi.rst
new file mode 100644
index 0000000000..c1bc47b900
--- /dev/null
+++ b/Documentation/driver-api/xilinx/eemi.rst
@@ -0,0 +1,40 @@
+====================================
+Xilinx Zynq MPSoC EEMI Documentation
+====================================
+
+Xilinx Zynq MPSoC Firmware Interface
+-------------------------------------
+The zynqmp-firmware node describes the interface to platform firmware.
+ZynqMP has an interface to communicate with secure firmware. Firmware
+driver provides an interface to firmware APIs. Interface APIs can be
+used by any driver to communicate with PMC(Platform Management Controller).
+
+Embedded Energy Management Interface (EEMI)
+----------------------------------------------
+The embedded energy management interface is used to allow software
+components running across different processing clusters on a chip or
+device to communicate with a power management controller (PMC) on a
+device to issue or respond to power management requests.
+
+Any driver who wants to communicate with PMC using EEMI APIs use the
+functions provided for each function.
+
+IOCTL
+------
+IOCTL API is for device control and configuration. It is not a system
+IOCTL but it is an EEMI API. This API can be used by master to control
+any device specific configuration. IOCTL definitions can be platform
+specific. This API also manage shared device configuration.
+
+The following IOCTL IDs are valid for device control:
+- IOCTL_SET_PLL_FRAC_MODE 8
+- IOCTL_GET_PLL_FRAC_MODE 9
+- IOCTL_SET_PLL_FRAC_DATA 10
+- IOCTL_GET_PLL_FRAC_DATA 11
+
+Refer EEMI API guide [0] for IOCTL specific parameters and other EEMI APIs.
+
+References
+----------
+[0] Embedded Energy Management Interface (EEMI) API guide:
+ https://www.xilinx.com/support/documentation/user_guides/ug1200-eemi-api.pdf
diff --git a/Documentation/driver-api/xilinx/index.rst b/Documentation/driver-api/xilinx/index.rst
new file mode 100644
index 0000000000..13f7589ed4
--- /dev/null
+++ b/Documentation/driver-api/xilinx/index.rst
@@ -0,0 +1,16 @@
+
+===========
+Xilinx FPGA
+===========
+
+.. toctree::
+ :maxdepth: 1
+
+ eemi
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/driver-api/xillybus.rst b/Documentation/driver-api/xillybus.rst
new file mode 100644
index 0000000000..a3ab832cb2
--- /dev/null
+++ b/Documentation/driver-api/xillybus.rst
@@ -0,0 +1,379 @@
+==========================================
+Xillybus driver for generic FPGA interface
+==========================================
+
+:Author: Eli Billauer, Xillybus Ltd. (http://xillybus.com)
+:Email: eli.billauer@gmail.com or as advertised on Xillybus' site.
+
+.. Contents:
+
+ - Introduction
+ -- Background
+ -- Xillybus Overview
+
+ - Usage
+ -- User interface
+ -- Synchronization
+ -- Seekable pipes
+
+ - Internals
+ -- Source code organization
+ -- Pipe attributes
+ -- Host never reads from the FPGA
+ -- Channels, pipes, and the message channel
+ -- Data streaming
+ -- Data granularity
+ -- Probing
+ -- Buffer allocation
+ -- The "nonempty" message (supporting poll)
+
+
+Introduction
+============
+
+Background
+----------
+
+An FPGA (Field Programmable Gate Array) is a piece of logic hardware, which
+can be programmed to become virtually anything that is usually found as a
+dedicated chipset: For instance, a display adapter, network interface card,
+or even a processor with its peripherals. FPGAs are the LEGO of hardware:
+Based upon certain building blocks, you make your own toys the way you like
+them. It's usually pointless to reimplement something that is already
+available on the market as a chipset, so FPGAs are mostly used when some
+special functionality is needed, and the production volume is relatively low
+(hence not justifying the development of an ASIC).
+
+The challenge with FPGAs is that everything is implemented at a very low
+level, even lower than assembly language. In order to allow FPGA designers to
+focus on their specific project, and not reinvent the wheel over and over
+again, pre-designed building blocks, IP cores, are often used. These are the
+FPGA parallels of library functions. IP cores may implement certain
+mathematical functions, a functional unit (e.g. a USB interface), an entire
+processor (e.g. ARM) or anything that might come handy. Think of them as a
+building block, with electrical wires dangling on the sides for connection to
+other blocks.
+
+One of the daunting tasks in FPGA design is communicating with a fullblown
+operating system (actually, with the processor running it): Implementing the
+low-level bus protocol and the somewhat higher-level interface with the host
+(registers, interrupts, DMA etc.) is a project in itself. When the FPGA's
+function is a well-known one (e.g. a video adapter card, or a NIC), it can
+make sense to design the FPGA's interface logic specifically for the project.
+A special driver is then written to present the FPGA as a well-known interface
+to the kernel and/or user space. In that case, there is no reason to treat the
+FPGA differently than any device on the bus.
+
+It's however common that the desired data communication doesn't fit any well-
+known peripheral function. Also, the effort of designing an elegant
+abstraction for the data exchange is often considered too big. In those cases,
+a quicker and possibly less elegant solution is sought: The driver is
+effectively written as a user space program, leaving the kernel space part
+with just elementary data transport. This still requires designing some
+interface logic for the FPGA, and write a simple ad-hoc driver for the kernel.
+
+Xillybus Overview
+-----------------
+
+Xillybus is an IP core and a Linux driver. Together, they form a kit for
+elementary data transport between an FPGA and the host, providing pipe-like
+data streams with a straightforward user interface. It's intended as a low-
+effort solution for mixed FPGA-host projects, for which it makes sense to
+have the project-specific part of the driver running in a user-space program.
+
+Since the communication requirements may vary significantly from one FPGA
+project to another (the number of data pipes needed in each direction and
+their attributes), there isn't one specific chunk of logic being the Xillybus
+IP core. Rather, the IP core is configured and built based upon a
+specification given by its end user.
+
+Xillybus presents independent data streams, which resemble pipes or TCP/IP
+communication to the user. At the host side, a character device file is used
+just like any pipe file. On the FPGA side, hardware FIFOs are used to stream
+the data. This is contrary to a common method of communicating through fixed-
+sized buffers (even though such buffers are used by Xillybus under the hood).
+There may be more than a hundred of these streams on a single IP core, but
+also no more than one, depending on the configuration.
+
+In order to ease the deployment of the Xillybus IP core, it contains a simple
+data structure which completely defines the core's configuration. The Linux
+driver fetches this data structure during its initialization process, and sets
+up the DMA buffers and character devices accordingly. As a result, a single
+driver is used to work out of the box with any Xillybus IP core.
+
+The data structure just mentioned should not be confused with PCI's
+configuration space or the Flattened Device Tree.
+
+Usage
+=====
+
+User interface
+--------------
+
+On the host, all interface with Xillybus is done through /dev/xillybus_*
+device files, which are generated automatically as the drivers loads. The
+names of these files depend on the IP core that is loaded in the FPGA (see
+Probing below). To communicate with the FPGA, open the device file that
+corresponds to the hardware FIFO you want to send data or receive data from,
+and use plain write() or read() calls, just like with a regular pipe. In
+particular, it makes perfect sense to go::
+
+ $ cat mydata > /dev/xillybus_thisfifo
+
+ $ cat /dev/xillybus_thatfifo > hisdata
+
+possibly pressing CTRL-C as some stage, even though the xillybus_* pipes have
+the capability to send an EOF (but may not use it).
+
+The driver and hardware are designed to behave sensibly as pipes, including:
+
+* Supporting non-blocking I/O (by setting O_NONBLOCK on open() ).
+
+* Supporting poll() and select().
+
+* Being bandwidth efficient under load (using DMA) but also handle small
+ pieces of data sent across (like TCP/IP) by autoflushing.
+
+A device file can be read only, write only or bidirectional. Bidirectional
+device files are treated like two independent pipes (except for sharing a
+"channel" structure in the implementation code).
+
+Synchronization
+---------------
+
+Xillybus pipes are configured (on the IP core) to be either synchronous or
+asynchronous. For a synchronous pipe, write() returns successfully only after
+some data has been submitted and acknowledged by the FPGA. This slows down
+bulk data transfers, and is nearly impossible for use with streams that
+require data at a constant rate: There is no data transmitted to the FPGA
+between write() calls, in particular when the process loses the CPU.
+
+When a pipe is configured asynchronous, write() returns if there was enough
+room in the buffers to store any of the data in the buffers.
+
+For FPGA to host pipes, asynchronous pipes allow data transfer from the FPGA
+as soon as the respective device file is opened, regardless of if the data
+has been requested by a read() call. On synchronous pipes, only the amount
+of data requested by a read() call is transmitted.
+
+In summary, for synchronous pipes, data between the host and FPGA is
+transmitted only to satisfy the read() or write() call currently handled
+by the driver, and those calls wait for the transmission to complete before
+returning.
+
+Note that the synchronization attribute has nothing to do with the possibility
+that read() or write() completes less bytes than requested. There is a
+separate configuration flag ("allowpartial") that determines whether such a
+partial completion is allowed.
+
+Seekable pipes
+--------------
+
+A synchronous pipe can be configured to have the stream's position exposed
+to the user logic at the FPGA. Such a pipe is also seekable on the host API.
+With this feature, a memory or register interface can be attached on the
+FPGA side to the seekable stream. Reading or writing to a certain address in
+the attached memory is done by seeking to the desired address, and calling
+read() or write() as required.
+
+
+Internals
+=========
+
+Source code organization
+------------------------
+
+The Xillybus driver consists of a core module, xillybus_core.c, and modules
+that depend on the specific bus interface (xillybus_of.c and xillybus_pcie.c).
+
+The bus specific modules are those probed when a suitable device is found by
+the kernel. Since the DMA mapping and synchronization functions, which are bus
+dependent by their nature, are used by the core module, a
+xilly_endpoint_hardware structure is passed to the core module on
+initialization. This structure is populated with pointers to wrapper functions
+which execute the DMA-related operations on the bus.
+
+Pipe attributes
+---------------
+
+Each pipe has a number of attributes which are set when the FPGA component
+(IP core) is built. They are fetched from the IDT (the data structure which
+defines the core's configuration, see Probing below) by xilly_setupchannels()
+in xillybus_core.c as follows:
+
+* is_writebuf: The pipe's direction. A non-zero value means it's an FPGA to
+ host pipe (the FPGA "writes").
+
+* channelnum: The pipe's identification number in communication between the
+ host and FPGA.
+
+* format: The underlying data width. See Data Granularity below.
+
+* allowpartial: A non-zero value means that a read() or write() (whichever
+ applies) may return with less than the requested number of bytes. The common
+ choice is a non-zero value, to match standard UNIX behavior.
+
+* synchronous: A non-zero value means that the pipe is synchronous. See
+ Synchronization above.
+
+* bufsize: Each DMA buffer's size. Always a power of two.
+
+* bufnum: The number of buffers allocated for this pipe. Always a power of two.
+
+* exclusive_open: A non-zero value forces exclusive opening of the associated
+ device file. If the device file is bidirectional, and already opened only in
+ one direction, the opposite direction may be opened once.
+
+* seekable: A non-zero value indicates that the pipe is seekable. See
+ Seekable pipes above.
+
+* supports_nonempty: A non-zero value (which is typical) indicates that the
+ hardware will send the messages that are necessary to support select() and
+ poll() for this pipe.
+
+Host never reads from the FPGA
+------------------------------
+
+Even though PCI Express is hotpluggable in general, a typical motherboard
+doesn't expect a card to go away all of the sudden. But since the PCIe card
+is based upon reprogrammable logic, a sudden disappearance from the bus is
+quite likely as a result of an accidental reprogramming of the FPGA while the
+host is up. In practice, nothing happens immediately in such a situation. But
+if the host attempts to read from an address that is mapped to the PCI Express
+device, that leads to an immediate freeze of the system on some motherboards,
+even though the PCIe standard requires a graceful recovery.
+
+In order to avoid these freezes, the Xillybus driver refrains completely from
+reading from the device's register space. All communication from the FPGA to
+the host is done through DMA. In particular, the Interrupt Service Routine
+doesn't follow the common practice of checking a status register when it's
+invoked. Rather, the FPGA prepares a small buffer which contains short
+messages, which inform the host what the interrupt was about.
+
+This mechanism is used on non-PCIe buses as well for the sake of uniformity.
+
+
+Channels, pipes, and the message channel
+----------------------------------------
+
+Each of the (possibly bidirectional) pipes presented to the user is allocated
+a data channel between the FPGA and the host. The distinction between channels
+and pipes is necessary only because of channel 0, which is used for interrupt-
+related messages from the FPGA, and has no pipe attached to it.
+
+Data streaming
+--------------
+
+Even though a non-segmented data stream is presented to the user at both
+sides, the implementation relies on a set of DMA buffers which is allocated
+for each channel. For the sake of illustration, let's take the FPGA to host
+direction: As data streams into the respective channel's interface in the
+FPGA, the Xillybus IP core writes it to one of the DMA buffers. When the
+buffer is full, the FPGA informs the host about that (appending a
+XILLYMSG_OPCODE_RELEASEBUF message channel 0 and sending an interrupt if
+necessary). The host responds by making the data available for reading through
+the character device. When all data has been read, the host writes on the
+FPGA's buffer control register, allowing the buffer's overwriting. Flow
+control mechanisms exist on both sides to prevent underflows and overflows.
+
+This is not good enough for creating a TCP/IP-like stream: If the data flow
+stops momentarily before a DMA buffer is filled, the intuitive expectation is
+that the partial data in buffer will arrive anyhow, despite the buffer not
+being completed. This is implemented by adding a field in the
+XILLYMSG_OPCODE_RELEASEBUF message, through which the FPGA informs not just
+which buffer is submitted, but how much data it contains.
+
+But the FPGA will submit a partially filled buffer only if directed to do so
+by the host. This situation occurs when the read() method has been blocking
+for XILLY_RX_TIMEOUT jiffies (currently 10 ms), after which the host commands
+the FPGA to submit a DMA buffer as soon as it can. This timeout mechanism
+balances between bus bandwidth efficiency (preventing a lot of partially
+filled buffers being sent) and a latency held fairly low for tails of data.
+
+A similar setting is used in the host to FPGA direction. The handling of
+partial DMA buffers is somewhat different, though. The user can tell the
+driver to submit all data it has in the buffers to the FPGA, by issuing a
+write() with the byte count set to zero. This is similar to a flush request,
+but it doesn't block. There is also an autoflushing mechanism, which triggers
+an equivalent flush roughly XILLY_RX_TIMEOUT jiffies after the last write().
+This allows the user to be oblivious about the underlying buffering mechanism
+and yet enjoy a stream-like interface.
+
+Note that the issue of partial buffer flushing is irrelevant for pipes having
+the "synchronous" attribute nonzero, since synchronous pipes don't allow data
+to lay around in the DMA buffers between read() and write() anyhow.
+
+Data granularity
+----------------
+
+The data arrives or is sent at the FPGA as 8, 16 or 32 bit wide words, as
+configured by the "format" attribute. Whenever possible, the driver attempts
+to hide this when the pipe is accessed differently from its natural alignment.
+For example, reading single bytes from a pipe with 32 bit granularity works
+with no issues. Writing single bytes to pipes with 16 or 32 bit granularity
+will also work, but the driver can't send partially completed words to the
+FPGA, so the transmission of up to one word may be held until it's fully
+occupied with user data.
+
+This somewhat complicates the handling of host to FPGA streams, because
+when a buffer is flushed, it may contain up to 3 bytes don't form a word in
+the FPGA, and hence can't be sent. To prevent loss of data, these leftover
+bytes need to be moved to the next buffer. The parts in xillybus_core.c
+that mention "leftovers" in some way are related to this complication.
+
+Probing
+-------
+
+As mentioned earlier, the number of pipes that are created when the driver
+loads and their attributes depend on the Xillybus IP core in the FPGA. During
+the driver's initialization, a blob containing configuration info, the
+Interface Description Table (IDT), is sent from the FPGA to the host. The
+bootstrap process is done in three phases:
+
+1. Acquire the length of the IDT, so a buffer can be allocated for it. This
+ is done by sending a quiesce command to the device, since the acknowledge
+ for this command contains the IDT's buffer length.
+
+2. Acquire the IDT itself.
+
+3. Create the interfaces according to the IDT.
+
+Buffer allocation
+-----------------
+
+In order to simplify the logic that prevents illegal boundary crossings of
+PCIe packets, the following rule applies: If a buffer is smaller than 4kB,
+it must not cross a 4kB boundary. Otherwise, it must be 4kB aligned. The
+xilly_setupchannels() functions allocates these buffers by requesting whole
+pages from the kernel, and diving them into DMA buffers as necessary. Since
+all buffers' sizes are powers of two, it's possible to pack any set of such
+buffers, with a maximal waste of one page of memory.
+
+All buffers are allocated when the driver is loaded. This is necessary,
+since large continuous physical memory segments are sometimes requested,
+which are more likely to be available when the system is freshly booted.
+
+The allocation of buffer memory takes place in the same order they appear in
+the IDT. The driver relies on a rule that the pipes are sorted with decreasing
+buffer size in the IDT. If a requested buffer is larger or equal to a page,
+the necessary number of pages is requested from the kernel, and these are
+used for this buffer. If the requested buffer is smaller than a page, one
+single page is requested from the kernel, and that page is partially used.
+Or, if there already is a partially used page at hand, the buffer is packed
+into that page. It can be shown that all pages requested from the kernel
+(except possibly for the last) are 100% utilized this way.
+
+The "nonempty" message (supporting poll)
+----------------------------------------
+
+In order to support the "poll" method (and hence select() ), there is a small
+catch regarding the FPGA to host direction: The FPGA may have filled a DMA
+buffer with some data, but not submitted that buffer. If the host waited for
+the buffer's submission by the FPGA, there would be a possibility that the
+FPGA side has sent data, but a select() call would still block, because the
+host has not received any notification about this. This is solved with
+XILLYMSG_OPCODE_NONEMPTY messages sent by the FPGA when a channel goes from
+completely empty to containing some data.
+
+These messages are used only to support poll() and select(). The IP core can
+be configured not to send them for a slight reduction of bandwidth.
diff --git a/Documentation/driver-api/zorro.rst b/Documentation/driver-api/zorro.rst
new file mode 100644
index 0000000000..664072b017
--- /dev/null
+++ b/Documentation/driver-api/zorro.rst
@@ -0,0 +1,104 @@
+========================================
+Writing Device Drivers for Zorro Devices
+========================================
+
+:Author: Written by Geert Uytterhoeven <geert@linux-m68k.org>
+:Last revised: September 5, 2003
+
+
+Introduction
+------------
+
+The Zorro bus is the bus used in the Amiga family of computers. Thanks to
+AutoConfig(tm), it's 100% Plug-and-Play.
+
+There are two types of Zorro buses, Zorro II and Zorro III:
+
+ - The Zorro II address space is 24-bit and lies within the first 16 MB of the
+ Amiga's address map.
+
+ - Zorro III is a 32-bit extension of Zorro II, which is backwards compatible
+ with Zorro II. The Zorro III address space lies outside the first 16 MB.
+
+
+Probing for Zorro Devices
+-------------------------
+
+Zorro devices are found by calling ``zorro_find_device()``, which returns a
+pointer to the ``next`` Zorro device with the specified Zorro ID. A probe loop
+for the board with Zorro ID ``ZORRO_PROD_xxx`` looks like::
+
+ struct zorro_dev *z = NULL;
+
+ while ((z = zorro_find_device(ZORRO_PROD_xxx, z))) {
+ if (!zorro_request_region(z->resource.start+MY_START, MY_SIZE,
+ "My explanation"))
+ ...
+ }
+
+``ZORRO_WILDCARD`` acts as a wildcard and finds any Zorro device. If your driver
+supports different types of boards, you can use a construct like::
+
+ struct zorro_dev *z = NULL;
+
+ while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
+ if (z->id != ZORRO_PROD_xxx1 && z->id != ZORRO_PROD_xxx2 && ...)
+ continue;
+ if (!zorro_request_region(z->resource.start+MY_START, MY_SIZE,
+ "My explanation"))
+ ...
+ }
+
+
+Zorro Resources
+---------------
+
+Before you can access a Zorro device's registers, you have to make sure it's
+not yet in use. This is done using the I/O memory space resource management
+functions::
+
+ request_mem_region()
+ release_mem_region()
+
+Shortcuts to claim the whole device's address space are provided as well::
+
+ zorro_request_device
+ zorro_release_device
+
+
+Accessing the Zorro Address Space
+---------------------------------
+
+The address regions in the Zorro device resources are Zorro bus address
+regions. Due to the identity bus-physical address mapping on the Zorro bus,
+they are CPU physical addresses as well.
+
+The treatment of these regions depends on the type of Zorro space:
+
+ - Zorro II address space is always mapped and does not have to be mapped
+ explicitly using z_ioremap().
+
+ Conversion from bus/physical Zorro II addresses to kernel virtual addresses
+ and vice versa is done using::
+
+ virt_addr = ZTWO_VADDR(bus_addr);
+ bus_addr = ZTWO_PADDR(virt_addr);
+
+ - Zorro III address space must be mapped explicitly using z_ioremap() first
+ before it can be accessed::
+
+ virt_addr = z_ioremap(bus_addr, size);
+ ...
+ z_iounmap(virt_addr);
+
+
+References
+----------
+
+#. linux/include/linux/zorro.h
+#. linux/include/uapi/linux/zorro.h
+#. linux/include/uapi/linux/zorro_ids.h
+#. linux/arch/m68k/include/asm/zorro.h
+#. linux/drivers/zorro
+#. /proc/bus/zorro
+