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         - gpios: OF device-tree gpio specification.
  14         - interrupts: the interrupt line for that input.
  15         - label: Descriptive name of the key.
  16         - linux,code: Keycode to emit.
  17
  18 Note that either "interrupts" or "gpios" properties can be omitted, but not
  19 both at the same time. Specifying both properties is allowed.
  20
  21 Optional subnode-properties:
  22         - linux,input-type: Specify event type this button/key generates.
  23           If not specified defaults to <1> == EV_KEY.
  24         - debounce-interval: Debouncing interval time in milliseconds.
  25           If not specified defaults to 5.
  26         - gpio-key,wakeup: Boolean, button can wake-up the system.
  27         - linux,can-disable: Boolean, indicates that button is connected
  28           to dedicated (not shared) interrupt which can be disabled to
  29           suppress events from the button.
  30
  31 Example nodes:
  32
  33         gpio_keys {
  34                         compatible = "gpio-keys";
  35                         #address-cells = <1>;
  36                         #size-cells = <0>;
  37                         autorepeat;
  38                         button@21 {
  39                                 label = "GPIO Key UP";
  40                                 linux,code = <103>;
  41                                 gpios = <&gpio1 0 1>;
  42                         };
  43                         button@22 {
  44                                 label = "GPIO Key DOWN";
  45                                 linux,code = <108>;
  46                                 interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
  47                         };
  48                         ...