Documentation/devicetree/bindings/input/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         - label: Descriptive name of the key.
  14         - linux,code: Keycode to emit.
  15
  16 Required mutual exclusive subnode-properties:
  17         - gpios: OF device-tree gpio specification.
  18         - interrupts: the interrupt line for that input
  19
  20 Optional subnode-properties:
  21         - linux,input-type: Specify event type this button/key generates.
  22           If not specified defaults to <1> == EV_KEY.
  23         - debounce-interval: Debouncing interval time in milliseconds.
  24           If not specified defaults to 5.
  25         - gpio-key,wakeup: Boolean, button can wake-up the system.
  26
  27 Example nodes:
  28
  29         gpio_keys {
  30                         compatible = "gpio-keys";
  31                         #address-cells = <1>;
  32                         #size-cells = <0>;
  33                         autorepeat;
  34                         button@21 {
  35                                 label = "GPIO Key UP";
  36                                 linux,code = <103>;
  37                                 gpios = <&gpio1 0 1>;
  38                         };
  39                         button@22 {
  40                                 label = "GPIO Key DOWN";
  41                                 linux,code = <108>;
  42                                 interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
  43                         };
  44                         ...