Documentation/devicetree/bindings/input/gpio-keys-polled.txt

   1 Device-Tree bindings for input/gpio_keys_polled.c keyboard driver
   2
   3 Required properties:
   4         - compatible = "gpio-keys-polled";
   5         - poll-interval: Poll interval time in milliseconds
   6
   7 Optional properties:
   8         - autorepeat: Boolean, Enable auto repeat feature of Linux input
   9           subsystem.
  10
  11 Each button (key) is represented as a sub-node of "gpio-keys-polled":
  12 Subnode properties:
  13
  14         - gpios: OF device-tree gpio specification.
  15         - label: Descriptive name of the key.
  16         - linux,code: Key / Axis code to emit.
  17
  18 Optional subnode-properties:
  19         - linux,input-type: Specify event type this button/key generates.
  20           If not specified defaults to <1> == EV_KEY.
  21         - linux,input-value: If linux,input-type is EV_ABS or EV_REL then this
  22           value is sent for events this button generates when pressed.
  23           EV_ABS/EV_REL axis will generate an event with a value of 0 when
  24           all buttons with linux,input-type == type and linux,code == axis
  25           are released. This value is interpreted as a signed 32 bit value,
  26           e.g. to make a button generate a value of -1 use:
  27           linux,input-value = <0xffffffff>; /* -1 */
  28         - debounce-interval: Debouncing interval time in milliseconds.
  29           If not specified defaults to 5.
  30         - wakeup-source: Boolean, button can wake-up the system.
  31                          (Legacy property supported: "gpio-key,wakeup")
  32
  33 Example nodes:
  34
  35         gpio_keys_polled {
  36                         compatible = "gpio-keys-polled";
  37                         #address-cells = <1>;
  38                         #size-cells = <0>;
  39                         poll-interval = <100>;
  40                         autorepeat;
  41                         button@21 {
  42                                 label = "GPIO Key UP";
  43                                 linux,code = <103>;
  44                                 gpios = <&gpio1 0 1>;
  45                         };
  46                         ...