xref: /linux/Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml (revision 58d416351e6df1a41d415958ccdd8eb9c2173fed) 
1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/input/allwinner,sun4i-a10-lradc-keys.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Allwinner A10 LRADC Device Tree Bindings
8
9maintainers:
10  - Chen-Yu Tsai <wens@csie.org>
11  - Maxime Ripard <mripard@kernel.org>
12
13properties:
14  compatible:
15    oneOf:
16      - const: allwinner,sun4i-a10-lradc-keys
17      - const: allwinner,sun8i-a83t-r-lradc
18      - items:
19          - const: allwinner,sun50i-a64-lradc
20          - const: allwinner,sun8i-a83t-r-lradc
21
22  reg:
23    maxItems: 1
24
25  interrupts:
26    maxItems: 1
27
28  vref-supply:
29    description:
30      Regulator for the LRADC reference voltage
31
32  wakeup-source: true
33
34patternProperties:
35  "^button-[0-9]+$":
36    type: object
37    properties:
38      label:
39        $ref: /schemas/types.yaml#/definitions/string
40        description: Descriptive name of the key
41
42      linux,code:
43        $ref: /schemas/types.yaml#/definitions/uint32
44        description: Keycode to emit
45
46      channel:
47        $ref: /schemas/types.yaml#/definitions/uint32
48        enum: [0, 1]
49        description: ADC Channel this key is attached to
50
51      voltage:
52        $ref: /schemas/types.yaml#/definitions/uint32
53        description:
54          Voltage in microvolts at LRADC input when this key is
55          pressed
56
57    required:
58      - label
59      - linux,code
60      - channel
61      - voltage
62
63    additionalProperties: false
64
65required:
66  - compatible
67  - reg
68  - interrupts
69  - vref-supply
70
71additionalProperties: false
72
73examples:
74  - |
75    lradc: lradc@1c22800 {
76        compatible = "allwinner,sun4i-a10-lradc-keys";
77        reg = <0x01c22800 0x100>;
78        interrupts = <31>;
79        vref-supply = <&reg_vcc3v0>;
80
81        button-191 {
82            label = "Volume Up";
83            linux,code = <115>;
84            channel = <0>;
85            voltage = <191274>;
86        };
87
88        button-392 {
89            label = "Volume Down";
90            linux,code = <114>;
91            channel = <0>;
92            voltage = <392644>;
93        };
94    };
95
96...
97