arm,twd.txt

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    1 * ARM Timer Watchdog
    2 
    3 ARM 11MP, Cortex-A5 and Cortex-A9 are often associated with a per-core
    4 Timer-Watchdog (aka TWD), which provides both a per-cpu local timer
    5 and watchdog.
    6 
    7 The TWD is usually attached to a GIC to deliver its two per-processor
    8 interrupts.
    9 
   10 ** Timer node required properties:
   11 
   12 - compatible : Should be one of:
   13         "arm,cortex-a9-twd-timer"
   14         "arm,cortex-a5-twd-timer"
   15         "arm,arm11mp-twd-timer"
   16 
   17 - interrupts : One interrupt to each core
   18 
   19 - reg : Specify the base address and the size of the TWD timer
   20         register window.
   21 
   22 Optional
   23 
   24 - always-on : a boolean property. If present, the timer is powered through
   25   an always-on power domain, therefore it never loses context.
   26 
   27 Example:
   28 
   29         twd-timer@2c000600 {
   30                 compatible = "arm,arm11mp-twd-timer"";
   31                 reg = <0x2c000600 0x20>;
   32                 interrupts = <1 13 0xf01>;
   33         };
   34 
   35 ** Watchdog node properties:
   36 
   37 - compatible : Should be one of:
   38         "arm,cortex-a9-twd-wdt"
   39         "arm,cortex-a5-twd-wdt"
   40         "arm,arm11mp-twd-wdt"
   41 
   42 - interrupts : One interrupt to each core
   43 
   44 - reg : Specify the base address and the size of the TWD watchdog
   45         register window.
   46 
   47 Example:
   48 
   49         twd-watchdog@2c000620 {
   50                 compatible = "arm,arm11mp-twd-wdt";
   51                 reg = <0x2c000620 0x20>;
   52                 interrupts = <1 14 0xf01>;
   53         };

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sys/contrib/device-tree/Bindings/timer/arm,twd.txt