Documentation/devicetree/bindings/power/reset/ltc2952-poweroff.txt

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/power/reset/ltc2952-poweroff.txt

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Linux kernel
Corpus path
Documentation/devicetree/bindings/power/reset/ltc2952-poweroff.txt
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.txt
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1129 bytes
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34
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: documentation
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atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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Annotated Snippet

Binding for the LTC2952 PowerPath controller

This chip is used to externally trigger a system shut down. Once the trigger has
been sent, the chip's watchdog has to be reset to gracefully shut down.
A full powerdown can be triggered via the kill signal.

Required properties:

- compatible:		Must contain: "lltc,ltc2952"
- watchdog-gpios:	phandle + gpio-specifier for the GPIO connected to the
			chip's watchdog line
- kill-gpios:		phandle + gpio-specifier for the GPIO connected to the
			chip's kill line

Optional properties:
- trigger-gpios:	phandle + gpio-specifier for the GPIO connected to the
			chip's trigger line. If this property is not set, the
			trigger function is ignored and the chip is kept alive
			until an explicit kill signal is received
- trigger-delay-ms	The number of milliseconds to wait after trigger line
			assertion before executing shut down procedure.
			The default is 2500ms.

Example:

ltc2952 {
	compatible = "lltc,ltc2952";

	trigger-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
	trigger-delay-ms = <2000>;
	watchdog-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
	kill-gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
};

Annotation

Implementation Notes