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/power/reset/ltc2952-poweroff.txt

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    1 Binding for the LTC2952 PowerPath controller
    2 
    3 This chip is used to externally trigger a system shut down. Once the trigger has
    4 been sent, the chip's watchdog has to be reset to gracefully shut down.
    5 A full powerdown can be triggered via the kill signal.
    6 
    7 Required properties:
    8 
    9 - compatible:           Must contain: "lltc,ltc2952"
   10 - watchdog-gpios:       phandle + gpio-specifier for the GPIO connected to the
   11                         chip's watchdog line
   12 - kill-gpios:           phandle + gpio-specifier for the GPIO connected to the
   13                         chip's kill line
   14 
   15 Optional properties:
   16 - trigger-gpios:        phandle + gpio-specifier for the GPIO connected to the
   17                         chip's trigger line. If this property is not set, the
   18                         trigger function is ignored and the chip is kept alive
   19                         until an explicit kill signal is received
   20 - trigger-delay-ms      The number of milliseconds to wait after trigger line
   21                         assertion before executing shut down procedure.
   22                         The default is 2500ms.
   23 
   24 Example:
   25 
   26 ltc2952 {
   27         compatible = "lltc,ltc2952";
   28 
   29         trigger-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
   30         trigger-delay-ms = <2000>;
   31         watchdog-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
   32         kill-gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
   33 };

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