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/sbsa-gwdt.txt

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    1 * SBSA (Server Base System Architecture) Generic Watchdog
    2 
    3 The SBSA Generic Watchdog Timer is used to force a reset of the system
    4 after two stages of timeout have elapsed.  A detailed definition of the
    5 watchdog timer can be found in the ARM document: ARM-DEN-0029 - Server
    6 Base System Architecture (SBSA)
    7 
    8 Required properties:
    9 - compatible: Should at least contain "arm,sbsa-gwdt".
   10 
   11 - reg: Each entry specifies the base physical address of a register frame
   12   and the length of that frame; currently, two frames must be defined,
   13   in this order:
   14   1: Watchdog control frame;
   15   2: Refresh frame.
   16 
   17 - interrupts: Should contain the Watchdog Signal 0 (WS0) SPI (Shared
   18   Peripheral Interrupt) number of SBSA Generic Watchdog.
   19 
   20 Optional properties
   21 - timeout-sec: Watchdog timeout values (in seconds).
   22 
   23 Example for FVP Foundation Model v8:
   24 
   25 watchdog@2a440000 {
   26         compatible = "arm,sbsa-gwdt";
   27         reg = <0x0 0x2a440000 0 0x1000>,
   28               <0x0 0x2a450000 0 0x1000>;
   29         interrupts = <0 27 4>;
   30         timeout-sec = <30>;
   31 };

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