FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/arm/atmel-sysregs.txt

     Atmel system registers
     
     Chipid required properties:
     - compatible: Should be "atmel,sama5d2-chipid" or "microchip,sama7g5-chipid"
     - reg : Should contain registers location and length
     
     PIT Timer required properties:
     - compatible: Should be "atmel,at91sam9260-pit"
     - reg: Should contain registers location and length
    - interrupts: Should contain interrupt for the PIT which is the IRQ line
      shared across all System Controller members.
    
    PIT64B Timer required properties:
    - compatible: Should be "microchip,sam9x60-pit64b"
    - reg: Should contain registers location and length
    - interrupts: Should contain interrupt for PIT64B timer
    - clocks: Should contain the available clock sources for PIT64B timer.
    
    System Timer (ST) required properties:
    - compatible: Should be "atmel,at91rm9200-st", "syscon", "simple-mfd"
    - reg: Should contain registers location and length
    - interrupts: Should contain interrupt for the ST which is the IRQ line
      shared across all System Controller members.
    - clocks: phandle to input clock.
    Its subnodes can be:
    - watchdog: compatible should be "atmel,at91rm9200-wdt"
    
    RAMC SDRAM/DDR Controller required properties:
    - compatible: Should be "atmel,at91rm9200-sdramc", "syscon"
                            "atmel,at91sam9260-sdramc",
                            "atmel,at91sam9g45-ddramc",
                            "atmel,sama5d3-ddramc",
                            "microchip,sam9x60-ddramc",
                            "microchip,sama7g5-uddrc"
    - reg: Should contain registers location and length
    
    Examples:
    
            ramc0: ramc@ffffe800 {
                    compatible = "atmel,at91sam9g45-ddramc";
                    reg = <0xffffe800 0x200>;
            };
    
    RAMC PHY Controller required properties:
    - compatible: Should be "microchip,sama7g5-ddr3phy", "syscon"
    - reg: Should contain registers location and length
    
    Example:
    
            ddr3phy: ddr3phy@e3804000 {
                    compatible = "microchip,sama7g5-ddr3phy", "syscon";
                    reg = <0xe3804000 0x1000>;
    };
    
    SHDWC Shutdown Controller
    
    required properties:
    - compatible: Should be "atmel,<chip>-shdwc".
      <chip> can be "at91sam9260", "at91sam9rl" or "at91sam9x5".
    - reg: Should contain registers location and length
    - clocks: phandle to input clock.
    
    optional properties:
    - atmel,wakeup-mode: String, operation mode of the wakeup mode.
      Supported values are: "none", "high", "low", "any".
    - atmel,wakeup-counter: Counter on Wake-up 0 (between 0x0 and 0xf).
    
    optional at91sam9260 properties:
    - atmel,wakeup-rtt-timer: boolean to enable Real-time Timer Wake-up.
    
    optional at91sam9rl properties:
    - atmel,wakeup-rtc-timer: boolean to enable Real-time Clock Wake-up.
    - atmel,wakeup-rtt-timer: boolean to enable Real-time Timer Wake-up.
    
    optional at91sam9x5 properties:
    - atmel,wakeup-rtc-timer: boolean to enable Real-time Clock Wake-up.
    
    Example:
    
            shdwc@fffffd10 {
                    compatible = "atmel,at91sam9260-shdwc";
                    reg = <0xfffffd10 0x10>;
                    clocks = <&clk32k>;
            };
    
    SHDWC SAMA5D2-Compatible Shutdown Controller
    
    1) shdwc node
    
    required properties:
    - compatible: should be "atmel,sama5d2-shdwc", "microchip,sam9x60-shdwc" or
      "microchip,sama7g5-shdwc"
    - reg: should contain registers location and length
    - clocks: phandle to input clock.
    - #address-cells: should be one. The cell is the wake-up input index.
    - #size-cells: should be zero.
    
    optional properties:
    
   - debounce-delay-us: minimum wake-up inputs debouncer period in
     microseconds. It's usually a board-related property.
   - atmel,wakeup-rtc-timer: boolean to enable Real-Time Clock wake-up.
   
   optional microchip,sam9x60-shdwc or microchip,sama7g5-shdwc properties:
   - atmel,wakeup-rtt-timer: boolean to enable Real-time Timer Wake-up.
   
   The node contains child nodes for each wake-up input that the platform uses.
   
   2) input nodes
   
   Wake-up input nodes are usually described in the "board" part of the Device
   Tree. Note also that input 0 is linked to the wake-up pin and is frequently
   used.
   
   Required properties:
   - reg: should contain the wake-up input index [0 - 15].
   
   Optional properties:
   - atmel,wakeup-active-high: boolean, the corresponding wake-up input described
     by the child, forces the wake-up of the core power supply on a high level.
     The default is to be active low.
   
   Example:
   
   On the SoC side:
           shdwc@f8048010 {
                   compatible = "atmel,sama5d2-shdwc";
                   reg = <0xf8048010 0x10>;
                   clocks = <&clk32k>;
                   #address-cells = <1>;
                   #size-cells = <0>;
                   atmel,wakeup-rtc-timer;
           };
   
   On the board side:
           shdwc@f8048010 {
                   debounce-delay-us = <976>;
   
                   input@0 {
                           reg = <0>;
                   };
   
                   input@1 {
                           reg = <1>;
                           atmel,wakeup-active-high;
                   };
           };
   
   Special Function Registers (SFR)
   
   Special Function Registers (SFR) manage specific aspects of the integrated
   memory, bridge implementations, processor and other functionality not controlled
   elsewhere.
   
   required properties:
   - compatible: Should be "atmel,<chip>-sfr", "syscon" or
           "atmel,<chip>-sfrbu", "syscon"
     <chip> can be "sama5d3", "sama5d4" or "sama5d2".
     It also can be "microchip,sam9x60-sfr", "syscon".
   - reg: Should contain registers location and length
   
           sfr@f0038000 {
                   compatible = "atmel,sama5d3-sfr", "syscon";
                   reg = <0xf0038000 0x60>;
           };
   
   Security Module (SECUMOD)
   
   The Security Module macrocell provides all necessary secure functions to avoid
   voltage, temperature, frequency and mechanical attacks on the chip. It also
   embeds secure memories that can be scrambled.
   
   The Security Module also offers the PIOBU pins which can be used as GPIO pins.
   Note that they maintain their voltage during Backup/Self-refresh.
   
   required properties:
   - compatible: Should be "atmel,<chip>-secumod", "syscon".
     <chip> can be "sama5d2".
   - reg: Should contain registers location and length
   - gpio-controller:      Marks the port as GPIO controller.
   - #gpio-cells:          There are 2. The pin number is the
                           first, the second represents additional
                           parameters such as GPIO_ACTIVE_HIGH/LOW.
   
   
           secumod@fc040000 {
                   compatible = "atmel,sama5d2-secumod", "syscon";
                   reg = <0xfc040000 0x100>;
                   gpio-controller;
                   #gpio-cells = <2>;
           };

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