1Device-Tree bindings for input/gpio_keys_polled.c keyboard driver
2
3Required properties:
4	- compatible = "gpio-keys-polled";
5	- poll-interval: Poll interval time in milliseconds
6
7Optional properties:
8	- autorepeat: Boolean, Enable auto repeat feature of Linux input
9	  subsystem.
10
11Each button (key) is represented as a sub-node of "gpio-keys-polled":
12Subnode 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
18Optional 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
33Example 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			...
47