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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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52473b0740
Make trigger delay configurable through device tree with trigger-delay-ms property. Trigger delay is the time to wait before starting shutdown sequence after trigger line assertion. Trigger delay must take into account the OFFT time configured with the capacitor connected to OFFT pin of the LTC2952 chip. Basically, the higher the capacitance connected to OFFT pin, the larger trigger delay must be. Signed-off-by: Marek Czerski <ma.czerski@gmail.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
Binding for the LTC2952 PowerPath controller
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This chip is used to externally trigger a system shut down. Once the trigger has
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been sent, the chip's watchdog has to be reset to gracefully shut down.
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A full powerdown can be triggered via the kill signal.
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Required properties:
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- compatible: Must contain: "lltc,ltc2952"
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- watchdog-gpios: phandle + gpio-specifier for the GPIO connected to the
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chip's watchdog line
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- kill-gpios: phandle + gpio-specifier for the GPIO connected to the
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chip's kill line
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Optional properties:
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- trigger-gpios: phandle + gpio-specifier for the GPIO connected to the
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chip's trigger line. If this property is not set, the
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trigger function is ignored and the chip is kept alive
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until an explicit kill signal is received
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- trigger-delay-ms The number of milliseconds to wait after trigger line
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assertion before executing shut down procedure.
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The default is 2500ms.
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Example:
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ltc2952 {
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compatible = "lltc,ltc2952";
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trigger-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
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trigger-delay-ms = <2000>;
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watchdog-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
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kill-gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
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};
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