xref: /linux/Documentation/devicetree/bindings/input/gpio-keys.yaml (revision a1c3be890440a1769ed6f822376a3e3ab0d42994) 
1# SPDX-License-Identifier: GPL-2.0-only
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/input/gpio-keys.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Device-Tree bindings for GPIO attached keys
8
9maintainers:
10  - Rob Herring <robh@kernel.org>
11
12properties:
13  compatible:
14    enum:
15      - gpio-keys
16      - gpio-keys-polled
17
18patternProperties:
19  ".*":
20    if:
21      type: object
22    then:
23      $ref: input.yaml#
24
25      properties:
26        gpios:
27          maxItems: 1
28
29        interrupts:
30          maxItems: 1
31
32        label:
33          description: Descriptive name of the key.
34
35        linux,code:
36          description: Key / Axis code to emit.
37          $ref: /schemas/types.yaml#/definitions/uint32
38
39        linux,input-type:
40          description:
41            Specify event type this button/key generates. If not specified defaults to
42            <1> == EV_KEY.
43          $ref: /schemas/types.yaml#/definitions/uint32
44
45          default: 1
46
47        linux,input-value:
48          description: |
49            If linux,input-type is EV_ABS or EV_REL then this
50            value is sent for events this button generates when pressed.
51            EV_ABS/EV_REL axis will generate an event with a value of 0
52            when all buttons with linux,input-type == type and
53            linux,code == axis are released. This value is interpreted
54            as a signed 32 bit value, e.g. to make a button generate a
55            value of -1 use:
56
57            linux,input-value = <0xffffffff>; /* -1 */
58
59          $ref: /schemas/types.yaml#/definitions/uint32
60
61        debounce-interval:
62          description:
63            Debouncing interval time in milliseconds. If not specified defaults to 5.
64          $ref: /schemas/types.yaml#/definitions/uint32
65
66          default: 5
67
68        wakeup-source:
69          description: Button can wake-up the system.
70
71        wakeup-event-action:
72          description: |
73            Specifies whether the key should wake the system when asserted, when
74            deasserted, or both. This property is only valid for keys that wake up the
75            system (e.g., when the "wakeup-source" property is also provided).
76
77            Supported values are defined in linux-event-codes.h:
78
79              EV_ACT_ANY        - both asserted and deasserted
80              EV_ACT_ASSERTED   - asserted
81              EV_ACT_DEASSERTED - deasserted
82          $ref: /schemas/types.yaml#/definitions/uint32
83          enum: [0, 1, 2]
84
85        linux,can-disable:
86          description:
87            Indicates that button is connected to dedicated (not shared) interrupt
88            which can be disabled to suppress events from the button.
89          type: boolean
90
91        pinctrl-0:
92          maxItems: 1
93
94        pinctrl-names:
95          maxItems: 1
96
97      required:
98        - linux,code
99
100      anyOf:
101        - required:
102            - interrupts
103        - required:
104            - gpios
105
106      dependencies:
107        wakeup-event-action: [ wakeup-source ]
108        linux,input-value: [ gpios ]
109
110      unevaluatedProperties: false
111
112if:
113  properties:
114    compatible:
115      const: gpio-keys-polled
116then:
117  properties:
118    poll-interval:
119      description:
120        Poll interval time in milliseconds
121      $ref: /schemas/types.yaml#/definitions/uint32
122
123  required:
124    - poll-interval
125
126additionalProperties: false
127
128examples:
129  - |
130    #include <dt-bindings/interrupt-controller/irq.h>
131
132    gpio-keys {
133        compatible = "gpio-keys";
134        autorepeat;
135
136        up {
137            label = "GPIO Key UP";
138            linux,code = <103>;
139            gpios = <&gpio1 0 1>;
140        };
141
142        down {
143            label = "GPIO Key DOWN";
144            linux,code = <108>;
145            interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
146        };
147    };
148
149...
150