1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/iio/adc/adi,ad7780.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Analog Devices AD7170/AD7171/AD7780/AD7781 analog to digital converters
8
9 maintainers:
10 - Michael Hennerich <michael.hennerich@analog.com>
11
12 description: |
13 The ad7780 is a sigma-delta analog to digital converter. This driver provides
14 reading voltage values and status bits from both the ad778x and ad717x series.
15 Its interface also allows writing on the FILTER and GAIN GPIO pins on the
16 ad778x.
17
18 Specifications on the converters can be found at:
19 AD7170:
20 https://www.analog.com/media/en/technical-documentation/data-sheets/AD7170.pdf
21 AD7171:
22 https://www.analog.com/media/en/technical-documentation/data-sheets/AD7171.pdf
23 AD7780:
24 https://www.analog.com/media/en/technical-documentation/data-sheets/ad7780.pdf
25 AD7781:
26 https://www.analog.com/media/en/technical-documentation/data-sheets/AD7781.pdf
27
28 properties:
29 compatible:
30 enum:
31 - adi,ad7170
32 - adi,ad7171
33 - adi,ad7780
34 - adi,ad7781
35
36 reg:
37 maxItems: 1
38
39 avdd-supply:
40 description:
41 The regulator supply for the ADC reference voltage.
42
43 powerdown-gpios:
44 description:
45 Must be the device tree identifier of the PDRST pin. If
46 specified, it will be asserted during driver probe. As the
47 line is active high, it should be marked GPIO_ACTIVE_HIGH.
48 maxItems: 1
49
50 adi,gain-gpios:
51 description:
52 Must be the device tree identifier of the GAIN pin. Only for
53 the ad778x chips. If specified, it will be asserted during
54 driver probe. As the line is active low, it should be marked
55 GPIO_ACTIVE_LOW.
56 maxItems: 1
57
58 adi,filter-gpios:
59 description:
60 Must be the device tree identifier of the FILTER pin. Only
61 for the ad778x chips. If specified, it will be asserted
62 during driver probe. As the line is active low, it should be
63 marked GPIO_ACTIVE_LOW.
64 maxItems: 1
65
66 required:
67 - compatible
68 - reg
69
70 additionalProperties: false
71
72 examples:
73 - |
74 #include <dt-bindings/gpio/gpio.h>
75 spi {
76 #address-cells = <1>;
77 #size-cells = <0>;
78
79 adc@0 {
80 compatible = "adi,ad7780";
81 reg = <0>;
82
83 avdd-supply = <&vdd_supply>;
84 powerdown-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
85 adi,gain-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
86 adi,filter-gpios = <&gpio2 15 GPIO_ACTIVE_LOW>;
87 };
88 };
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