dt-bindings: input: add common keyboard document bindings
This patch adds the device tree binding documentation for common keyboard. Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Chen Zhong <chen.zhong@mediatek.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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General Keys Properties:
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Optional properties for Keys:
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- power-off-time-sec: Duration in seconds which the key should be kept
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pressed for device to power off automatically. Device with key pressed
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shutdown feature can specify this property.
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- linux,keycodes: Specifies the numeric keycode values to be used for
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reporting key presses.
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