Adding upstream version 4.19.249.upstream/4.19.249

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

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+ARM Microchip SoCs (aka AT91)
+=============================
+
+
+Introduction
+------------
+This document gives useful information about the ARM Microchip SoCs that are
+currently supported in Linux Mainline (you know, the one on kernel.org).
+
+It is important to note that the Microchip (previously Atmel) ARM-based MPU
+product line is historically named "AT91" or "at91" throughout the Linux kernel
+development process even if this product prefix has completely disappeared from
+the official Microchip product name. Anyway, files, directories, git trees,
+git branches/tags and email subject always contain this "at91" sub-string.
+
+
+AT91 SoCs
+---------
+Documentation and detailed datasheet for each product are available on
+the Microchip website: http://www.microchip.com.
+
+  Flavors:
+    * ARM 920 based SoC
+      - at91rm9200
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-1768-32-bit-ARM920T-Embedded-Microprocessor-AT91RM9200_Datasheet.pdf
+
+    * ARM 926 based SoCs
+      - at91sam9260
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6221-32-bit-ARM926EJ-S-Embedded-Microprocessor-SAM9260_Datasheet.pdf
+
+      - at91sam9xe
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6254-32-bit-ARM926EJ-S-Embedded-Microprocessor-SAM9XE_Datasheet.pdf
+
+      - at91sam9261
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6062-ARM926EJ-S-Microprocessor-SAM9261_Datasheet.pdf
+
+      - at91sam9263
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6249-32-bit-ARM926EJ-S-Embedded-Microprocessor-SAM9263_Datasheet.pdf
+
+      - at91sam9rl
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/doc6289.pdf
+
+      - at91sam9g20
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/DS60001516A.pdf
+
+      - at91sam9g45 family
+        - at91sam9g45
+        - at91sam9g46
+        - at91sam9m10
+        - at91sam9m11 (device superset)
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6437-32-bit-ARM926-Embedded-Microprocessor-SAM9M11_Datasheet.pdf
+
+      - at91sam9x5 family (aka "The 5 series")
+        - at91sam9g15
+        - at91sam9g25
+        - at91sam9g35
+        - at91sam9x25
+        - at91sam9x35
+        + Datasheet (can be considered as covering the whole family)
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-11055-32-bit-ARM926EJ-S-Microcontroller-SAM9X35_Datasheet.pdf
+
+      - at91sam9n12
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/DS60001517A.pdf
+
+    * ARM Cortex-A5 based SoCs
+      - sama5d3 family
+        - sama5d31
+        - sama5d33
+        - sama5d34
+        - sama5d35
+        - sama5d36 (device superset)
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-11121-32-bit-Cortex-A5-Microcontroller-SAMA5D3_Datasheet.pdf
+
+    * ARM Cortex-A5 + NEON based SoCs
+      - sama5d4 family
+        - sama5d41
+        - sama5d42
+        - sama5d43
+        - sama5d44 (device superset)
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/60001525A.pdf
+
+      - sama5d2 family
+        - sama5d21
+        - sama5d22
+        - sama5d23
+        - sama5d24
+        - sama5d26
+        - sama5d27 (device superset)
+        - sama5d28 (device superset + environmental monitors)
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/DS60001476B.pdf
+
+    * ARM Cortex-M7 MCUs
+      - sams70 family
+        - sams70j19
+        - sams70j20
+        - sams70j21
+        - sams70n19
+        - sams70n20
+        - sams70n21
+        - sams70q19
+        - sams70q20
+        - sams70q21
+
+      - samv70 family
+        - samv70j19
+        - samv70j20
+        - samv70n19
+        - samv70n20
+        - samv70q19
+        - samv70q20
+
+      - samv71 family
+        - samv71j19
+        - samv71j20
+        - samv71j21
+        - samv71n19
+        - samv71n20
+        - samv71n21
+        - samv71q19
+        - samv71q20
+        - samv71q21
+
+        + Datasheet
+          http://ww1.microchip.com/downloads/en/DeviceDoc/60001527A.pdf
+
+
+Linux kernel information
+------------------------
+Linux kernel mach directory: arch/arm/mach-at91
+MAINTAINERS entry is: "ARM/Microchip (AT91) SoC support"
+
+
+Device Tree for AT91 SoCs and boards
+------------------------------------
+All AT91 SoCs are converted to Device Tree. Since Linux 3.19, these products
+must use this method to boot the Linux kernel.
+
+Work In Progress statement:
+Device Tree files and Device Tree bindings that apply to AT91 SoCs and boards are
+considered as "Unstable". To be completely clear, any at91 binding can change at
+any time. So, be sure to use a Device Tree Binary and a Kernel Image generated from
+the same source tree.
+Please refer to the Documentation/devicetree/bindings/ABI.txt file for a
+definition of a "Stable" binding/ABI.
+This statement will be removed by AT91 MAINTAINERS when appropriate.
+
+Naming conventions and best practice:
+- SoCs Device Tree Source Include files are named after the official name of
+  the product (at91sam9g20.dtsi or sama5d33.dtsi for instance).
+- Device Tree Source Include files (.dtsi) are used to collect common nodes that can be
+  shared across SoCs or boards (sama5d3.dtsi or at91sam9x5cm.dtsi for instance).
+  When collecting nodes for a particular peripheral or topic, the identifier have to
+  be placed at the end of the file name, separated with a "_" (at91sam9x5_can.dtsi
+  or sama5d3_gmac.dtsi for example).
+- board Device Tree Source files (.dts) are prefixed by the string "at91-" so
+  that they can be identified easily. Note that some files are historical exceptions
+  to this rule (sama5d3[13456]ek.dts, usb_a9g20.dts or animeo_ip.dts for example).