Documentation/arm/Atmel/README

   1 ARM Atmel SoCs (aka AT91)
   2 =========================
   3
   4
   5 Introduction
   6 ------------
   7 This document gives useful information about the ARM Atmel SoCs that are
   8 currently supported in Linux Mainline (you know, the one on kernel.org).
   9
  10 It is important to note that the Atmel | SMART ARM-based MPU product line is
  11 historically named "AT91" or "at91" throughout the Linux kernel development
  12 process even if this product prefix has completely disappeared from the
  13 official Atmel product name. Anyway, files, directories, git trees,
  14 git branches/tags and email subject always contain this "at91" sub-string.
  15
  16
  17 AT91 SoCs
  18 ---------
  19 Documentation and detailled datasheet for each product are available on
  20 the Atmel website: http://www.atmel.com.
  21
  22   Flavors:
  23     * ARM 920 based SoC
  24       - at91rm9200
  25         + Datasheet
  26           http://www.atmel.com/Images/doc1768.pdf
  27
  28     * ARM 926 based SoCs
  29       - at91sam9260
  30         + Datasheet
  31           http://www.atmel.com/Images/doc6221.pdf
  32
  33       - at91sam9xe
  34         + Datasheet
  35           http://www.atmel.com/Images/Atmel-6254-32-bit-ARM926EJ-S-Embedded-Microprocessor-SAM9XE_Datasheet.pdf
  36
  37       - at91sam9261
  38         + Datasheet
  39           http://www.atmel.com/Images/doc6062.pdf
  40
  41       - at91sam9263
  42         + Datasheet
  43           http://www.atmel.com/Images/Atmel_6249_32-bit-ARM926EJ-S-Microcontroller_SAM9263_Datasheet.pdf
  44
  45       - at91sam9rl
  46         + Datasheet
  47           http://www.atmel.com/Images/doc6289.pdf
  48
  49       - at91sam9g20
  50         + Datasheet
  51           http://www.atmel.com/Images/doc6384.pdf
  52
  53       - at91sam9g45 family
  54         - at91sam9g45
  55         - at91sam9g46
  56         - at91sam9m10
  57         - at91sam9m11 (device superset)
  58         + Datasheet
  59           http://www.atmel.com/Images/Atmel-6437-32-bit-ARM926-Embedded-Microprocessor-SAM9M11_Datasheet.pdf
  60
  61       - at91sam9x5 family (aka "The 5 series")
  62         - at91sam9g15
  63         - at91sam9g25
  64         - at91sam9g35
  65         - at91sam9x25
  66         - at91sam9x35
  67         + Datasheet (can be considered as covering the whole family)
  68           http://www.atmel.com/Images/Atmel_11055_32-bit-ARM926EJ-S-Microcontroller_SAM9X35_Datasheet.pdf
  69
  70       - at91sam9n12
  71         + Datasheet
  72           http://www.atmel.com/Images/Atmel_11063_32-bit-ARM926EJ-S-Microcontroller_SAM9N12CN11CN12_Datasheet.pdf
  73
  74     * ARM Cortex-A5 based SoCs
  75       - sama5d3 family
  76         - sama5d31
  77         - sama5d33
  78         - sama5d34
  79         - sama5d35
  80         - sama5d36 (device superset)
  81         + Datasheet
  82           http://www.atmel.com/Images/Atmel-11121-32-bit-Cortex-A5-Microcontroller-SAMA5D3_Datasheet.pdf
  83
  84     * ARM Cortex-A5 + NEON based SoCs
  85       - sama5d4 family
  86         - sama5d41
  87         - sama5d42
  88         - sama5d43
  89         - sama5d44 (device superset)
  90         + Datasheet
  91           http://www.atmel.com/Images/Atmel-11238-32-bit-Cortex-A5-Microcontroller-SAMA5D4_Datasheet.pdf
  92
  93       - sama5d2 family
  94         - sama5d21
  95         - sama5d22
  96         - sama5d23
  97         - sama5d24
  98         - sama5d26
  99         - sama5d27 (device superset)
 100         - sama5d28 (device superset + environmental monitors)
 101         + Datasheet
 102           http://www.atmel.com/Images/Atmel-11267-32-bit-Cortex-A5-Microcontroller-SAMA5D2_Datasheet.pdf
 103
 104
 105 Linux kernel information
 106 ------------------------
 107 Linux kernel mach directory: arch/arm/mach-at91
 108 MAINTAINERS entry is: "ARM/ATMEL AT91RM9200 AND AT91SAM ARM ARCHITECTURES"
 109
 110
 111 Device Tree for AT91 SoCs and boards
 112 ------------------------------------
 113 All AT91 SoCs are converted to Device Tree. Since Linux 3.19, these products
 114 must use this method to boot the Linux kernel.
 115
 116 Work In Progress statement:
 117 Device Tree files and Device Tree bindings that apply to AT91 SoCs and boards are
 118 considered as "Unstable". To be completely clear, any at91 binding can change at
 119 any time. So, be sure to use a Device Tree Binary and a Kernel Image generated from
 120 the same source tree.
 121 Please refer to the Documentation/devicetree/bindings/ABI.txt file for a
 122 definition of a "Stable" binding/ABI.
 123 This statement will be removed by AT91 MAINTAINERS when appropriate.
 124
 125 Naming conventions and best practice:
 126 - SoCs Device Tree Source Include files are named after the official name of
 127   the product (at91sam9g20.dtsi or sama5d33.dtsi for instance).
 128 - Device Tree Source Include files (.dtsi) are used to collect common nodes that can be
 129   shared across SoCs or boards (sama5d3.dtsi or at91sam9x5cm.dtsi for instance).
 130   When collecting nodes for a particular peripheral or topic, the identifier have to
 131   be placed at the end of the file name, separated with a "_" (at91sam9x5_can.dtsi
 132   or sama5d3_gmac.dtsi for example).
 133 - board Device Tree Source files (.dts) are prefixed by the string "at91-" so
 134   that they can be identified easily. Note that some files are historical exceptions
 135   to this rule (sama5d3[13456]ek.dts, usb_a9g20.dts or animeo_ip.dts for example).