Dump adc-keys bindings documentation from Linux kernel source tree v5.10. Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com> --- doc/device-tree-bindings/input/adc-keys.txt | 49 +++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 doc/device-tree-bindings/input/adc-keys.txt
diff --git a/doc/device-tree-bindings/input/adc-keys.txt b/doc/device-tree-bindings/input/adc-keys.txt new file mode 100644 index 0000000000..e551814629 --- /dev/null +++ b/doc/device-tree-bindings/input/adc-keys.txt @@ -0,0 +1,49 @@ +ADC attached resistor ladder buttons +------------------------------------ + +Required properties: + - compatible: "adc-keys" + - io-channels: Phandle to an ADC channel + - io-channel-names = "buttons"; + - keyup-threshold-microvolt: Voltage at which all the keys are considered up. + +Optional properties: + - poll-interval: Poll interval time in milliseconds + - autorepeat: Boolean, Enable auto repeat feature of Linux input + subsystem. + +Each button (key) is represented as a sub-node of "adc-keys": + +Required subnode-properties: + - label: Descriptive name of the key. + - linux,code: Keycode to emit. + - press-threshold-microvolt: Voltage ADC input when this key is pressed. + +Example: + +#include <dt-bindings/input/input.h> + + adc-keys { + compatible = "adc-keys"; + io-channels = <&lradc 0>; + io-channel-names = "buttons"; + keyup-threshold-microvolt = <2000000>; + + button-up { + label = "Volume Up"; + linux,code = <KEY_VOLUMEUP>; + press-threshold-microvolt = <1500000>; + }; + + button-down { + label = "Volume Down"; + linux,code = <KEY_VOLUMEDOWN>; + press-threshold-microvolt = <1000000>; + }; + + button-enter { + label = "Enter"; + linux,code = <KEY_ENTER>; + press-threshold-microvolt = <500000>; + }; + }; -- 2.17.1