The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/watchdog/atmel-sama5d4-wdt.txt

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    1 * Atmel SAMA5D4 Watchdog Timer (WDT) Controller
    2 
    3 Required properties:
    4 - compatible: "atmel,sama5d4-wdt" or "microchip,sam9x60-wdt"
    5 - reg: base physical address and length of memory mapped region.
    6 
    7 Optional properties:
    8 - timeout-sec: watchdog timeout value (in seconds).
    9 - interrupts: interrupt number to the CPU.
   10 - atmel,watchdog-type: should be "hardware" or "software".
   11         "hardware": enable watchdog fault reset. A watchdog fault triggers
   12                     watchdog reset.
   13         "software": enable watchdog fault interrupt. A watchdog fault asserts
   14                     watchdog interrupt.
   15 - atmel,idle-halt: present if you want to stop the watchdog when the CPU is
   16                    in idle state.
   17         CAUTION: This property should be used with care, it actually makes the
   18         watchdog not counting when the CPU is in idle state, therefore the
   19         watchdog reset time depends on mean CPU usage and will not reset at all
   20         if the CPU stop working while it is in idle state, which is probably
   21         not what you want.
   22 - atmel,dbg-halt: present if you want to stop the watchdog when the CPU is
   23                   in debug state.
   24 
   25 Example:
   26         watchdog@fc068640 {
   27                 compatible = "atmel,sama5d4-wdt";
   28                 reg = <0xfc068640 0x10>;
   29                 interrupts = <4 IRQ_TYPE_LEVEL_HIGH 5>;
   30                 timeout-sec = <10>;
   31                 atmel,watchdog-type = "hardware";
   32                 atmel,dbg-halt;
   33                 atmel,idle-halt;
   34         };

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