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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/power/reset/gpio-poweroff.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: GPIO controlled power off
maintainers:
- Sebastian Reichel <sre@kernel.org>
description: >
System power off support via a GPIO line. When a shutdown is
executed the operating system is expected to switch the GPIO
from inactive to active. After a delay (active-delay-ms) it
is expected to be switched back to inactive. After another
delay (inactive-delay-ms) it is configured as active again.
Finally the operating system assumes the power off failed if
the system is still running after waiting some time (timeout-ms).
properties:
compatible:
const: gpio-poweroff
gpios:
maxItems: 1
input:
type: boolean
description: >
Initially configure the GPIO line as an input. Only reconfigure
it to an output when the power-off sequence is initiated. If this optional
property is not specified, the GPIO is initialized as an output in its inactive state.
active-delay-ms:
default: 100
description: Delay to wait after driving gpio active
inactive-delay-ms:
default: 100
description: Delay to wait after driving gpio inactive
timeout-ms:
default: 3000
description: Time to wait before assuming the power off sequence failed.
required:
- compatible
- gpios
additionalProperties: false
examples:
- |
gpio-poweroff {
compatible = "gpio-poweroff";
gpios = <&gpio 4 0>;
timeout-ms = <3000>;
};
|
