gpio-poweroff.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/power/reset/gpio-poweroff.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: GPIO controlled power off
    8 
    9 maintainers:
   10   - Sebastian Reichel <sre@kernel.org>
   11 
   12 description: >
   13   System power off support via a GPIO line. When a shutdown is
   14   executed the operating system is expected to switch the GPIO
   15   from inactive to active. After a delay (active-delay-ms) it
   16   is expected to be switched back to inactive. After another
   17   delay (inactive-delay-ms) it is configured as active again.
   18   Finally the operating system assumes the power off failed if
   19   the system is still running after waiting some time (timeout-ms).
   20 
   21 properties:
   22   compatible:
   23     const: gpio-poweroff
   24 
   25   gpios:
   26     maxItems: 1
   27 
   28   input:
   29     type: boolean
   30     description: >
   31       Initially configure the GPIO line as an input. Only reconfigure
   32       it to an output when the power-off sequence is initiated. If this optional
   33       property is not specified, the GPIO is initialized as an output in its inactive state.
   34 
   35   active-delay-ms:
   36     default: 100
   37     description: Delay to wait after driving gpio active
   38 
   39   inactive-delay-ms:
   40     default: 100
   41     description: Delay to wait after driving gpio inactive
   42 
   43   timeout-ms:
   44     default: 3000
   45     description: Time to wait before assuming the power off sequence failed.
   46 
   47 required:
   48   - compatible
   49   - gpios
   50 
   51 additionalProperties: false
   52 
   53 examples:
   54   - |
   55     gpio-poweroff {
   56         compatible = "gpio-poweroff";
   57         gpios = <&gpio 4 0>;
   58         timeout-ms = <3000>;
   59     };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/power/reset/gpio-poweroff.yaml

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/power/reset/gpio-poweroff.yaml