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