1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 # Copyright 2019 Analog Devices Inc.
3 %YAML 1.2
4 ---
5 $id: http://devicetree.org/schemas/iio/adc/adi,ad7476.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
7
8 title: AD7476 and similar simple SPI ADCs from multiple manufacturers.
9
10 maintainers:
11 - Michael Hennerich <michael.hennerich@analog.com>
12
13 description: |
14 A lot of simple SPI ADCs have very straight forward interfaces.
15 They typically don't provide a MOSI pin, simply reading out data
16 on MISO when the clock toggles.
17
18 properties:
19 compatible:
20 enum:
21 - adi,ad7091
22 - adi,ad7091r
23 - adi,ad7273
24 - adi,ad7274
25 - adi,ad7276
26 - adi,ad7277
27 - adi,ad7278
28 - adi,ad7466
29 - adi,ad7467
30 - adi,ad7468
31 - adi,ad7475
32 - adi,ad7476
33 - adi,ad7476a
34 - adi,ad7477
35 - adi,ad7477a
36 - adi,ad7478
37 - adi,ad7478a
38 - adi,ad7495
39 - adi,ad7910
40 - adi,ad7920
41 - adi,ad7940
42 - ti,adc081s
43 - ti,adc101s
44 - ti,adc121s
45 - ti,ads7866
46 - ti,ads7867
47 - ti,ads7868
48 - lltc,ltc2314-14
49
50 reg:
51 maxItems: 1
52
53 vcc-supply:
54 description:
55 Main powersupply voltage for the chips, sometimes referred to as VDD on
56 datasheets. If there is no separate vref-supply, then this is needed
57 to establish channel scaling.
58
59 vdrive-supply:
60 description:
61 Some devices have separate supply for their digital control side.
62
63 vref-supply:
64 description:
65 Some devices have a specific reference voltage supplied on a different pin
66 to the other supplies. Needed to be able to establish channel scaling
67 unless there is also an internal reference available (e.g. ad7091r)
68
69 adi,conversion-start-gpios:
70 description: A GPIO used to trigger the start of a conversion
71 maxItems: 1
72
73 required:
74 - compatible
75 - reg
76
77 allOf:
78 - $ref: /schemas/spi/spi-peripheral-props.yaml#
79
80 # Devices where reference is vcc
81 - if:
82 properties:
83 compatible:
84 contains:
85 enum:
86 - adi,ad7091
87 - adi,ad7276
88 - adi,ad7277
89 - adi,ad7278
90 - adi,ad7466
91 - adi,ad7467
92 - adi,ad7468
93 - adi,ad7940
94 - ti,adc081s
95 - ti,adc101s
96 - ti,adc121s
97 - ti,ads7866
98 - ti,ads7868
99 then:
100 required:
101 - vcc-supply
102 # Devices with a vref
103 - if:
104 properties:
105 compatible:
106 contains:
107 enum:
108 - adi,ad7091r
109 - adi,ad7273
110 - adi,ad7274
111 - adi,ad7475
112 - lltc,ltc2314-14
113 then:
114 properties:
115 vref-supply: true
116 else:
117 properties:
118 vref-supply: false
119 # Devices with a vref where it is not optional
120 - if:
121 properties:
122 compatible:
123 contains:
124 enum:
125 - adi,ad7273
126 - adi,ad7274
127 - adi,ad7475
128 - lltc,ltc2314-14
129 then:
130 required:
131 - vref-supply
132 - if:
133 properties:
134 compatible:
135 contains:
136 enum:
137 - adi,ad7475
138 - adi,ad7495
139 then:
140 properties:
141 vdrive-supply: true
142 else:
143 properties:
144 vdrive-supply: false
145 - if:
146 properties:
147 compatible:
148 contains:
149 enum:
150 - adi,ad7091
151 - adi,ad7091r
152 then:
153 properties:
154 adi,conversion-start-gpios: true
155 else:
156 properties:
157 adi,conversion-start-gpios: false
158
159 unevaluatedProperties: false
160
161 examples:
162 - |
163 spi {
164 #address-cells = <1>;
165 #size-cells = <0>;
166
167 adc@0 {
168 compatible = "adi,ad7091r";
169 reg = <0>;
170 spi-max-frequency = <5000000>;
171 vcc-supply = <&adc_vcc>;
172 vref-supply = <&adc_vref>;
173 };
174 };
175 ...
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