Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 95 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-devices-soc b/Documentation/ABI/testing/sysfs-devices-soc
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+What:		/sys/devices/socX
+Date:		January 2012
+contact:	Lee Jones <lee.jones@linaro.org>
+Description:
+		The /sys/devices/ directory contains a sub-directory for each
+		System-on-Chip (SoC) device on a running platform. Information
+		regarding each SoC can be obtained by reading sysfs files. This
+		functionality is only available if implemented by the platform.
+
+		The directory created for each SoC will also house information
+		about devices which are commonly contained in /sys/devices/platform.
+		It has been agreed that if an SoC device exists, its supported
+		devices would be better suited to appear as children of that SoC.
+
+What:		/sys/devices/socX/machine
+Date:		January 2012
+contact:	Lee Jones <lee.jones@linaro.org>
+Description:
+		Read-only attribute common to all SoCs. Contains the SoC machine
+		name (e.g. Ux500).
+
+What:		/sys/devices/socX/family
+Date:		January 2012
+contact:	Lee Jones <lee.jones@linaro.org>
+Description:
+		Read-only attribute common to all SoCs. Contains SoC family name
+		(e.g. DB8500).
+
+		On many of ARM based silicon with SMCCC v1.2+ compliant firmware
+		this will contain the JEDEC JEP106 manufacturer’s identification
+		code. The format is "jep106:XXYY" where XX is identity code and
+		YY is continuation code.
+
+		This manufacturer’s identification code is defined by one
+		or more eight (8) bit fields, each consisting of seven (7)
+		data bits plus one (1) odd parity bit. It is a single field,
+		limiting the possible number of vendors to 126. To expand
+		the maximum number of identification codes, a continuation
+		scheme has been defined.
+
+		The specified mechanism is that an identity code of 0x7F
+		represents the "continuation code" and implies the presence
+		of an additional identity code field, and this mechanism
+		may be extended to multiple continuation codes followed
+		by the manufacturer's identity code.
+
+		For example, ARM has identity code 0x7F 0x7F 0x7F 0x7F 0x3B,
+		which is code 0x3B on the fifth 'page'. This is shortened
+		as JEP106 identity code of 0x3B and a continuation code of
+		0x4 to represent the four continuation codes preceding the
+		identity code.
+
+What:		/sys/devices/socX/serial_number
+Date:		January 2019
+contact:	Bjorn Andersson <bjorn.andersson@linaro.org>
+Description:
+		Read-only attribute supported by most SoCs. Contains the SoC's
+		serial number, if available.
+
+What:		/sys/devices/socX/soc_id
+Date:		January 2012
+contact:	Lee Jones <lee.jones@linaro.org>
+Description:
+		Read-only attribute supported by most SoCs. In the case of
+		ST-Ericsson's chips this contains the SoC serial number.
+
+		On many of ARM based silicon with SMCCC v1.2+ compliant firmware
+		this will contain the SOC ID appended to the family attribute
+		to ensure there is no conflict in this namespace across various
+		vendors. The format is "jep106:XXYY:ZZZZ" where XX is identity
+		code, YY is continuation code and ZZZZ is the SOC ID.
+
+What:		/sys/devices/socX/revision
+Date:		January 2012
+contact:	Lee Jones <lee.jones@linaro.org>
+Description:
+		Read-only attribute supported by most SoCs. Contains the SoC's
+		manufacturing revision number.
+
+What:		/sys/devices/socX/process
+Date:		January 2012
+contact:	Lee Jones <lee.jones@linaro.org>
+Description:
+		Read-only attribute supported ST-Ericsson's silicon. Contains the
+		the process by which the silicon chip was manufactured.
+
+What:		/sys/bus/soc
+Date:		January 2012
+contact:	Lee Jones <lee.jones@linaro.org>
+Description:
+		The /sys/bus/soc/ directory contains the usual sub-folders
+		expected under most buses. /sys/bus/soc/devices is of particular
+		interest, as it contains a symlink for each SoC device found on
+		the system. Each symlink points back into the aforementioned
+		/sys/devices/socX devices.