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Documentation: DT: Add LTC2952 poweroff bindings

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LTC2952 is an external power control chip, which signals
the OS to shut down. This patch documents the DT binding
for the chip.

Signed-off-by: René Moll <rene.moll@xsens.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
René Moll 2014-08-08 13:12:22 +00:00 committed by Sebastian Reichel
parent 6647156c00
commit a4b7aef6b0
1 changed files with 26 additions and 0 deletions
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Documentation/devicetree/bindings/power/reset/ltc2952-poweroff.txt Normal file
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Binding for the LTC2952 PowerPath controller
This chip is used to externally trigger a system shut down. Once the trigger has
been sent, the chips' watchdog has to be reset to gracefully shut down.
If the Linux systems decides to shut down it powers off the platform via the
kill signal.
Required properties:
- compatible: Must contain: "lltc,ltc2952"
- trigger-gpios: phandle + gpio-specifier for the GPIO connected to the
chip's trigger line
- 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
Example:
ltc2952 {
compatible = "lltc,ltc2952";
trigger-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
watchdog-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
kill-gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
};