Documentation/devicetree/bindings/arm/atmel-at91.txt

   1 Atmel AT91 device tree bindings.
   2 ================================
   3
   4 Boards with a SoC of the Atmel AT91 or SMART family shall have the following
   5 properties:
   6
   7 Required root node properties:
   8 compatible: must be one of:
   9  * "atmel,at91rm9200"
  10
  11  * "atmel,at91sam9" for SoCs using an ARM926EJ-S core, shall be extended with
  12    the specific SoC family or compatible:
  13     o "atmel,at91sam9260"
  14     o "atmel,at91sam9261"
  15     o "atmel,at91sam9263"
  16     o "atmel,at91sam9x5" for the 5 series, shall be extended with the specific
  17       SoC compatible:
  18        - "atmel,at91sam9g15"
  19        - "atmel,at91sam9g25"
  20        - "atmel,at91sam9g35"
  21        - "atmel,at91sam9x25"
  22        - "atmel,at91sam9x35"
  23     o "atmel,at91sam9g20"
  24     o "atmel,at91sam9g45"
  25     o "atmel,at91sam9n12"
  26     o "atmel,at91sam9rl"
  27     o "atmel,at91sam9xe"
  28  * "atmel,sama5" for SoCs using a Cortex-A5, shall be extended with the specific
  29    SoC family:
  30     o "atmel,sama5d2" shall be extended with the specific SoC compatible:
  31        - "atmel,sama5d27"
  32     o "atmel,sama5d3" shall be extended with the specific SoC compatible:
  33        - "atmel,sama5d31"
  34        - "atmel,sama5d33"
  35        - "atmel,sama5d34"
  36        - "atmel,sama5d35"
  37        - "atmel,sama5d36"
  38     o "atmel,sama5d4" shall be extended with the specific SoC compatible:
  39        - "atmel,sama5d41"
  40        - "atmel,sama5d42"
  41        - "atmel,sama5d43"
  42        - "atmel,sama5d44"
  43
  44 Chipid required properties:
  45 - compatible: Should be "atmel,sama5d2-chipid"
  46 - reg : Should contain registers location and length
  47
  48 PIT Timer required properties:
  49 - compatible: Should be "atmel,at91sam9260-pit"
  50 - reg: Should contain registers location and length
  51 - interrupts: Should contain interrupt for the PIT which is the IRQ line
  52   shared across all System Controller members.
  53
  54 System Timer (ST) required properties:
  55 - compatible: Should be "atmel,at91rm9200-st", "syscon", "simple-mfd"
  56 - reg: Should contain registers location and length
  57 - interrupts: Should contain interrupt for the ST which is the IRQ line
  58   shared across all System Controller members.
  59 - clocks: phandle to input clock.
  60 Its subnodes can be:
  61 - watchdog: compatible should be "atmel,at91rm9200-wdt"
  62
  63 TC/TCLIB Timer required properties:
  64 - compatible: Should be "atmel,<chip>-tcb".
  65   <chip> can be "at91rm9200" or "at91sam9x5"
  66 - reg: Should contain registers location and length
  67 - interrupts: Should contain all interrupts for the TC block
  68   Note that you can specify several interrupt cells if the TC
  69   block has one interrupt per channel.
  70 - clock-names: tuple listing input clock names.
  71         Required elements: "t0_clk", "slow_clk"
  72         Optional elements: "t1_clk", "t2_clk"
  73 - clocks: phandles to input clocks.
  74
  75 Examples:
  76
  77 One interrupt per TC block:
  78         tcb0: timer@fff7c000 {
  79                 compatible = "atmel,at91rm9200-tcb";
  80                 reg = <0xfff7c000 0x100>;
  81                 interrupts = <18 4>;
  82                 clocks = <&tcb0_clk>;
  83                 clock-names = "t0_clk";
  84         };
  85
  86 One interrupt per TC channel in a TC block:
  87         tcb1: timer@fffdc000 {
  88                 compatible = "atmel,at91rm9200-tcb";
  89                 reg = <0xfffdc000 0x100>;
  90                 interrupts = <26 4 27 4 28 4>;
  91                 clocks = <&tcb1_clk>;
  92                 clock-names = "t0_clk";
  93         };
  94
  95 RSTC Reset Controller required properties:
  96 - compatible: Should be "atmel,<chip>-rstc".
  97   <chip> can be "at91sam9260" or "at91sam9g45" or "sama5d3"
  98 - reg: Should contain registers location and length
  99 - clocks: phandle to input clock.
 100
 101 Example:
 102
 103         rstc@fffffd00 {
 104                 compatible = "atmel,at91sam9260-rstc";
 105                 reg = <0xfffffd00 0x10>;
 106                 clocks = <&clk32k>;
 107         };
 108
 109 RAMC SDRAM/DDR Controller required properties:
 110 - compatible: Should be "atmel,at91rm9200-sdramc", "syscon"
 111                         "atmel,at91sam9260-sdramc",
 112                         "atmel,at91sam9g45-ddramc",
 113                         "atmel,sama5d3-ddramc",
 114 - reg: Should contain registers location and length
 115
 116 Examples:
 117
 118         ramc0: ramc@ffffe800 {
 119                 compatible = "atmel,at91sam9g45-ddramc";
 120                 reg = <0xffffe800 0x200>;
 121         };
 122
 123 SHDWC Shutdown Controller
 124
 125 required properties:
 126 - compatible: Should be "atmel,<chip>-shdwc".
 127   <chip> can be "at91sam9260", "at91sam9rl" or "at91sam9x5".
 128 - reg: Should contain registers location and length
 129 - clocks: phandle to input clock.
 130
 131 optional properties:
 132 - atmel,wakeup-mode: String, operation mode of the wakeup mode.
 133   Supported values are: "none", "high", "low", "any".
 134 - atmel,wakeup-counter: Counter on Wake-up 0 (between 0x0 and 0xf).
 135
 136 optional at91sam9260 properties:
 137 - atmel,wakeup-rtt-timer: boolean to enable Real-time Timer Wake-up.
 138
 139 optional at91sam9rl properties:
 140 - atmel,wakeup-rtc-timer: boolean to enable Real-time Clock Wake-up.
 141 - atmel,wakeup-rtt-timer: boolean to enable Real-time Timer Wake-up.
 142
 143 optional at91sam9x5 properties:
 144 - atmel,wakeup-rtc-timer: boolean to enable Real-time Clock Wake-up.
 145
 146 Example:
 147
 148         shdwc@fffffd10 {
 149                 compatible = "atmel,at91sam9260-shdwc";
 150                 reg = <0xfffffd10 0x10>;
 151                 clocks = <&clk32k>;
 152         };
 153
 154 SHDWC SAMA5D2-Compatible Shutdown Controller
 155
 156 1) shdwc node
 157
 158 required properties:
 159 - compatible: should be "atmel,sama5d2-shdwc".
 160 - reg: should contain registers location and length
 161 - clocks: phandle to input clock.
 162 - #address-cells: should be one. The cell is the wake-up input index.
 163 - #size-cells: should be zero.
 164
 165 optional properties:
 166
 167 - debounce-delay-us: minimum wake-up inputs debouncer period in
 168   microseconds. It's usually a board-related property.
 169 - atmel,wakeup-rtc-timer: boolean to enable Real-Time Clock wake-up.
 170
 171 The node contains child nodes for each wake-up input that the platform uses.
 172
 173 2) input nodes
 174
 175 Wake-up input nodes are usually described in the "board" part of the Device
 176 Tree. Note also that input 0 is linked to the wake-up pin and is frequently
 177 used.
 178
 179 Required properties:
 180 - reg: should contain the wake-up input index [0 - 15].
 181
 182 Optional properties:
 183 - atmel,wakeup-active-high: boolean, the corresponding wake-up input described
 184   by the child, forces the wake-up of the core power supply on a high level.
 185   The default is to be active low.
 186
 187 Example:
 188
 189 On the SoC side:
 190         shdwc@f8048010 {
 191                 compatible = "atmel,sama5d2-shdwc";
 192                 reg = <0xf8048010 0x10>;
 193                 clocks = <&clk32k>;
 194                 #address-cells = <1>;
 195                 #size-cells = <0>;
 196                 atmel,wakeup-rtc-timer;
 197         };
 198
 199 On the board side:
 200         shdwc@f8048010 {
 201                 debounce-delay-us = <976>;
 202
 203                 input@0 {
 204                         reg = <0>;
 205                 };
 206
 207                 input@1 {
 208                         reg = <1>;
 209                         atmel,wakeup-active-high;
 210                 };
 211         };
 212
 213 Special Function Registers (SFR)
 214
 215 Special Function Registers (SFR) manage specific aspects of the integrated
 216 memory, bridge implementations, processor and other functionality not controlled
 217 elsewhere.
 218
 219 required properties:
 220 - compatible: Should be "atmel,<chip>-sfr", "syscon" or
 221         "atmel,<chip>-sfrbu", "syscon"
 222   <chip> can be "sama5d3", "sama5d4" or "sama5d2".
 223 - reg: Should contain registers location and length
 224
 225         sfr@f0038000 {
 226                 compatible = "atmel,sama5d3-sfr", "syscon";
 227                 reg = <0xf0038000 0x60>;
 228         };
 229
 230 Security Module (SECUMOD)
 231
 232 The Security Module macrocell provides all necessary secure functions to avoid
 233 voltage, temperature, frequency and mechanical attacks on the chip. It also
 234 embeds secure memories that can be scrambled
 235
 236 required properties:
 237 - compatible: Should be "atmel,<chip>-secumod", "syscon".
 238   <chip> can be "sama5d2".
 239 - reg: Should contain registers location and length
 240
 241         secumod@fc040000 {
 242                 compatible = "atmel,sama5d2-secumod", "syscon";
 243                 reg = <0xfc040000 0x100>;
 244         };