summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/iio/adc/adi,ad7124.yaml
blob: deb34deff0e874f497d31fd429c5f4c0759cc952 (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
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
# Copyright 2019 Analog Devices Inc.
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/adc/adi,ad7124.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Analog Devices AD7124 ADC device driver

maintainers:
  - Stefan Popa <stefan.popa@analog.com>

description: |
  Bindings for the Analog Devices AD7124 ADC device. Datasheet can be
  found here:
    https://www.analog.com/media/en/technical-documentation/data-sheets/AD7124-8.pdf

properties:
  compatible:
    enum:
      - adi,ad7124-4
      - adi,ad7124-8

  reg:
    description: SPI chip select number for the device
    maxItems: 1

  clocks:
    maxItems: 1
    description: phandle to the master clock (mclk)

  clock-names:
    items:
      - const: mclk

  interrupts:
    description: IRQ line for the ADC
    maxItems: 1

  '#address-cells':
    const: 1

  '#size-cells':
    const: 0

  refin1-supply:
    description: refin1 supply can be used as reference for conversion.

  refin2-supply:
    description: refin2 supply can be used as reference for conversion.

  avdd-supply:
    description: avdd supply can be used as reference for conversion.

required:
  - compatible
  - reg
  - clocks
  - clock-names
  - interrupts

patternProperties:
  "^channel@([0-9]|1[0-5])$":
    type: object
    description: |
      Represents the external channels which are connected to the ADC.
      See Documentation/devicetree/bindings/iio/adc/adc.txt.

    properties:
      reg:
        description: |
          The channel number. It can have up to 8 channels on ad7124-4
          and 16 channels on ad7124-8, numbered from 0 to 15.
        items:
          minimum: 0
          maximum: 15

      adi,reference-select:
        description: |
          Select the reference source to use when converting on
          the specific channel. Valid values are:
          0: REFIN1(+)/REFIN1(−).
          1: REFIN2(+)/REFIN2(−).
          3: AVDD
          If this field is left empty, internal reference is selected.
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1, 3]

      diff-channels:
        description: see Documentation/devicetree/bindings/iio/adc/adc.txt
        items:
          minimum: 0
          maximum: 15

      bipolar:
        description: see Documentation/devicetree/bindings/iio/adc/adc.txt
        type: boolean

      adi,buffered-positive:
        description: Enable buffered mode for positive input.
        type: boolean

      adi,buffered-negative:
        description: Enable buffered mode for negative input.
        type: boolean

    required:
      - reg
      - diff-channels

examples:
  - |
    spi {
      #address-cells = <1>;
      #size-cells = <0>;

      adc@0 {
        compatible = "adi,ad7124-4";
        reg = <0>;
        spi-max-frequency = <5000000>;
        interrupts = <25 2>;
        interrupt-parent = <&gpio>;
        refin1-supply = <&adc_vref>;
        clocks = <&ad7124_mclk>;
        clock-names = "mclk";

        #address-cells = <1>;
        #size-cells = <0>;

        channel@0 {
          reg = <0>;
          diff-channels = <0 1>;
          adi,reference-select = <0>;
          adi,buffered-positive;
        };

        channel@1 {
          reg = <1>;
          bipolar;
          diff-channels = <2 3>;
          adi,reference-select = <0>;
          adi,buffered-positive;
          adi,buffered-negative;
        };

        channel@2 {
          reg = <2>;
          diff-channels = <4 5>;
        };

        channel@3 {
          reg = <3>;
          diff-channels = <6 7>;
        };
      };
    };