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a2f25245 APS |
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. | |
6f29d3b2 | 16 | - linux,code: Key / Axis code to emit. |
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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. | |
6f29d3b2 HG |
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 */ | |
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28 | - debounce-interval: Debouncing interval time in milliseconds. |
29 | If not specified defaults to 5. | |
99b4ffbd | 30 | - wakeup-source: Boolean, button can wake-up the system. |
71a0151c | 31 | (Legacy property supported: "gpio-key,wakeup") |
a2f25245 APS |
32 | |
33 | Example nodes: | |
34 | ||
35 | gpio_keys_polled { | |
36 | compatible = "gpio-keys-polled"; | |
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37 | poll-interval = <100>; |
38 | autorepeat; | |
de56bea0 VZ |
39 | |
40 | button21 { | |
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41 | label = "GPIO Key UP"; |
42 | linux,code = <103>; | |
43 | gpios = <&gpio1 0 1>; | |
44 | }; | |
45 | ... |