Documentation/devicetree/bindings/input/rockchip-keys.txt

   1 ROCKCHIP ADC attached resistor ladder buttons
   2 ------------------------------------
   3
   4 Required properties:
   5  - compatible: "rockchip,key"
   6  - io-channels: Phandle to an ADC channel
   7
   8 Each button (key) is represented as a sub-node of "rockchip,key":
   9
  10 Required subnode-properties:
  11         - label: Descriptive name of the key.
  12         - linux,code: Keycode to emit.
  13         - rockchip,adc_value:: Voltage ADC input when this key is pressed.
  14
  15 Example:
  16
  17 #include <dt-bindings/input/input.h>
  18
  19         rk_key: rockchip-key {
  20                 compatible = "rockchip,key";
  21                 status = "okay";
  22
  23                 io-channels = <&saradc 1>;
  24
  25                 vol-up-key {
  26                         linux,code = <115>;
  27                         label = "volume up";
  28                         rockchip,adc_value = <1>;
  29                 };
  30
  31                 vol-down-key {
  32                         linux,code = <114>;
  33                         label = "volume down";
  34                         rockchip,adc_value = <170>;
  35                 };
  36
  37                 power-key {
  38                         gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
  39                         linux,code = <116>;
  40                         pinctrl-names = "default";
  41                         pinctrl-0 = <&pwrbtn>;
  42                         label = "power";
  43                         gpio-key,wakeup;
  44                 };
  45
  46                 menu-key {
  47                         linux,code = <59>;
  48                         label = "menu";
  49                         rockchip,adc_value = <355>;
  50                 };
  51
  52                 home-key {
  53                         linux,code = <102>;
  54                         label = "home";
  55                         rockchip,adc_value = <746>;
  56                 };
  57
  58                 back-key {
  59                         linux,code = <158>;
  60                         label = "back";
  61                         rockchip,adc_value = <560>;
  62                 };
  63
  64                 camera-key {
  65                         linux,code = <212>;
  66                         label = "camera";
  67                         rockchip,adc_value = <450>;
  68                 };
  69         };