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         - label: String, name of the input device.
  10
  11 Each button (key) is represented as a sub-node of "gpio-keys":
  12 Subnode properties:
  13
  14         - gpios: OF device-tree gpio specification.
  15         - interrupts: the interrupt line for that input.
  16         - label: Descriptive name of the key.
  17         - linux,code: Keycode to emit.
  18
  19 Note that either "interrupts" or "gpios" properties can be omitted, but not
  20 both at the same time. Specifying both properties is allowed.
  21
  22 Optional subnode-properties:
  23         - linux,input-type: Specify event type this button/key generates.
  24           If not specified defaults to <1> == EV_KEY.
  25         - debounce-interval: Debouncing interval time in milliseconds.
  26           If not specified defaults to 5.
  27         - wakeup-source: Boolean, button can wake-up the system.
  28                          (Legacy property supported: "gpio-key,wakeup")
  29         - wakeup-event-action: Specifies whether the key should wake the
  30           system when asserted, when deasserted, or both. This property is
  31           only valid for keys that wake up the system (e.g., when the
  32           "wakeup-source" property is also provided).
  33           Supported values are defined in linux-event-codes.h:
  34                 EV_ACT_ASSERTED         - asserted
  35                 EV_ACT_DEASSERTED       - deasserted
  36                 EV_ACT_ANY              - both asserted and deasserted
  37         - linux,can-disable: Boolean, indicates that button is connected
  38           to dedicated (not shared) interrupt which can be disabled to
  39           suppress events from the button.
  40
  41 Example nodes:
  42
  43         gpio-keys {
  44                         compatible = "gpio-keys";
  45                         autorepeat;
  46
  47                         up {
  48                                 label = "GPIO Key UP";
  49                                 linux,code = <103>;
  50                                 gpios = <&gpio1 0 1>;
  51                         };
  52
  53                         down {
  54                                 label = "GPIO Key DOWN";
  55                                 linux,code = <108>;
  56                                 interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
  57                         };
  58                         ...