Documentation/devicetree/bindings/gpio/gpio_keys.txt

   1 Device-Tree bindings for input/gpio_keys.c keyboard driver
   2
   3 Required properties:
   4         - compatible = "gpio-keys";
   5
   6 Optional properties:
   7         - autorepeat: Boolean, Enable auto repeat feature of Linux input
   8           subsystem.
   9
  10 Each button (key) is represented as a sub-node of "gpio-keys":
  11 Subnode properties:
  12
  13         - gpios: OF device-tree gpio specification.
  14         - label: Descriptive name of the key.
  15         - linux,code: Keycode to emit.
  16
  17 Optional subnode-properties:
  18         - linux,input-type: Specify event type this button/key generates.
  19           If not specified defaults to <1> == EV_KEY.
  20         - debounce-interval: Debouncing interval time in milliseconds.
  21           If not specified defaults to 5.
  22         - gpio-key,wakeup: Boolean, button can wake-up the system.
  23
  24 Example nodes:
  25
  26         gpio_keys {
  27                         compatible = "gpio-keys";
  28                         #address-cells = <1>;
  29                         #size-cells = <0>;
  30                         autorepeat;
  31                         button@21 {
  32                                 label = "GPIO Key UP";
  33                                 linux,code = <103>;
  34                                 gpios = <&gpio1 0 1>;
  35                         };
  36                         ...