Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt

   1 Allwinner sun4i low res adc attached tablet keys
   2 ------------------------------------------------
   3
   4 Required properties:
   5  - compatible: "allwinner,sun4i-a10-lradc-keys"
   6  - reg: mmio address range of the chip
   7  - interrupts: interrupt to which the chip is connected
   8  - vref-supply: powersupply for the lradc reference voltage
   9
  10 Each key is represented as a sub-node of "allwinner,sun4i-a10-lradc-keys":
  11
  12 Required subnode-properties:
  13         - label: Descriptive name of the key.
  14         - linux,code: Keycode to emit.
  15         - channel: Channel this key is attached to, must be 0 or 1.
  16         - voltage: Voltage in µV at lradc input when this key is pressed.
  17
  18 Example:
  19
  20 #include <dt-bindings/input/input.h>
  21
  22         lradc: lradc@1c22800 {
  23                 compatible = "allwinner,sun4i-a10-lradc-keys";
  24                 reg = <0x01c22800 0x100>;
  25                 interrupts = <31>;
  26                 vref-supply = <&reg_vcc3v0>;
  27
  28                 button@191 {
  29                         label = "Volume Up";
  30                         linux,code = <KEY_VOLUMEUP>;
  31                         channel = <0>;
  32                         voltage = <191274>;
  33                 };
  34
  35                 button@392 {
  36                         label = "Volume Down";
  37                         linux,code = <KEY_VOLUMEDOWN>;
  38                         channel = <0>;
  39                         voltage = <392644>;
  40                 };
  41
  42                 button@601 {
  43                         label = "Menu";
  44                         linux,code = <KEY_MENU>;
  45                         channel = <0>;
  46                         voltage = <601151>;
  47                 };
  48
  49                 button@795 {
  50                         label = "Enter";
  51                         linux,code = <KEY_ENTER>;
  52                         channel = <0>;
  53                         voltage = <795090>;
  54                 };
  55
  56                 button@987 {
  57                         label = "Home";
  58                         linux,code = <KEY_HOMEPAGE>;
  59                         channel = <0>;
  60                         voltage = <987387>;
  61                 };
  62         };