summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/input/gpio-keys.yaml
blob: cc78c2152921308fe0cad3e29ca78a5fad08f066 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
# SPDX-License-Identifier: GPL-2.0-only
%YAML 1.2
---
$id: http://devicetree.org/schemas/input/gpio-keys.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: GPIO attached keys

maintainers:
  - Rob Herring <robh@kernel.org>

properties:
  compatible:
    enum:
      - gpio-keys
      - gpio-keys-polled

  autorepeat: true

  label:
    description: Name of entire device

  poll-interval: true

patternProperties:
  "^(button|event|key|switch|(button|event|key|switch)-[a-z0-9-]+|[a-z0-9-]+-(button|event|key|switch))$":
    $ref: input.yaml#

    properties:
      gpios:
        maxItems: 1

      interrupts:
        oneOf:
          - items:
              - description: Optional key interrupt or wakeup interrupt
          - items:
              - description: Key interrupt
              - description: Wakeup interrupt

      interrupt-names:
        description:
          Optional interrupt names, can be used to specify a separate dedicated
          wake-up interrupt in addition to the gpio irq
        oneOf:
          - items:
              - enum: [ irq, wakeup ]
          - items:
              - const: irq
              - const: wakeup

      label:
        description: Descriptive name of the key.

      linux,code:
        description: Key / Axis code to emit.

      linux,input-type:
        default: 1  # EV_KEY

      linux,input-value:
        description: |
          If linux,input-type is EV_ABS or EV_REL then this
          value is sent for events this button generates when pressed.
          EV_ABS/EV_REL axis will generate an event with a value of 0
          when all buttons with linux,input-type == type and
          linux,code == axis are released. This value is interpreted
          as a signed 32 bit value, e.g. to make a button generate a
          value of -1 use:

          linux,input-value = <0xffffffff>; /* -1 */

        $ref: /schemas/types.yaml#/definitions/uint32

      debounce-interval:
        description:
          Debouncing interval time in milliseconds. If not specified defaults to 5.
        $ref: /schemas/types.yaml#/definitions/uint32

        default: 5

      wakeup-source:
        description: Button can wake-up the system.

      wakeup-event-action:
        description: |
          Specifies whether the key should wake the system when asserted, when
          deasserted, or both. This property is only valid for keys that wake up the
          system (e.g., when the "wakeup-source" property is also provided).

          Supported values are defined in linux-event-codes.h:

            EV_ACT_ANY        - both asserted and deasserted
            EV_ACT_ASSERTED   - asserted
            EV_ACT_DEASSERTED - deasserted
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1, 2]

      linux,can-disable:
        description:
          Indicates that button is connected to dedicated (not shared) interrupt
          which can be disabled to suppress events from the button.
        type: boolean

    required:
      - linux,code

    anyOf:
      - required:
          - interrupts
      - required:
          - interrupts-extended
      - required:
          - gpios

    allOf:
      - if:
          properties:
            interrupts:
              minItems: 2
          required:
            - interrupts
        then:
          properties:
            interrupt-names:
              minItems: 2
          required:
            - interrupt-names

    dependencies:
      wakeup-event-action: [ wakeup-source ]
      linux,input-value: [ gpios ]

    unevaluatedProperties: false

allOf:
  - $ref: input.yaml#
  - if:
      properties:
        compatible:
          const: gpio-keys-polled
    then:
      required:
        - poll-interval
    else:
      properties:
        poll-interval: false

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/irq.h>

    gpio-keys {
        compatible = "gpio-keys";
        autorepeat;

        key-up {
            label = "GPIO Key UP";
            linux,code = <103>;
            gpios = <&gpio1 0 1>;
        };

        key-down {
            label = "GPIO Key DOWN";
            linux,code = <108>;
            interrupts = <1 IRQ_TYPE_EDGE_FALLING>;
        };

        key-wakeup {
            label = "GPIO Key WAKEUP";
            linux,code = <143>;
            interrupts-extended = <&intc 2 IRQ_TYPE_EDGE_FALLING>,
                                  <&intc_wakeup 0 IRQ_TYPE_LEVEL_HIGH>;
            interrupt-names = "irq", "wakeup";
            wakeup-source;
        };
    };

...