linux/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
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   1* Atmel Watchdog Timers
   2
   3** at91sam9-wdt
   4
   5Required properties:
   6- compatible: must be "atmel,at91sam9260-wdt".
   7- reg: physical base address of the controller and length of memory mapped
   8  region.
   9
  10Optional properties:
  11- timeout-sec: contains the watchdog timeout in seconds.
  12
  13Example:
  14
  15        watchdog@fffffd40 {
  16                compatible = "atmel,at91sam9260-wdt";
  17                reg = <0xfffffd40 0x10>;
  18                timeout-sec = <10>;
  19        };
  20