ROCKCHIP ADC attached resistor ladder buttons
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Required properties:
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- compatible: "rockchip,key"
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- io-channels: Phandle to an ADC channel
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Each button (key) is represented as a sub-node of "rockchip,key":
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Required subnode-properties:
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- label: Descriptive name of the key.
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- linux,code: Keycode to emit.
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- rockchip,adc_value:: Voltage ADC input when this key is pressed.
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Example:
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#include <dt-bindings/input/input.h>
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rk_key: rockchip-key {
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compatible = "rockchip,key";
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status = "okay";
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io-channels = <&saradc 1>;
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vol-up-key {
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linux,code = <115>;
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label = "volume up";
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rockchip,adc_value = <1>;
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};
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vol-down-key {
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linux,code = <114>;
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label = "volume down";
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rockchip,adc_value = <170>;
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};
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power-key {
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gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
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linux,code = <116>;
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pinctrl-names = "default";
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pinctrl-0 = <&pwrbtn>;
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label = "power";
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gpio-key,wakeup;
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};
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menu-key {
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linux,code = <59>;
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label = "menu";
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rockchip,adc_value = <355>;
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};
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home-key {
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linux,code = <102>;
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label = "home";
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rockchip,adc_value = <746>;
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};
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back-key {
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linux,code = <158>;
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label = "back";
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rockchip,adc_value = <560>;
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};
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camera-key {
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linux,code = <212>;
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label = "camera";
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rockchip,adc_value = <450>;
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};
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};
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