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
|
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
# Copyright 2025 Analog Devices Inc.
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/adc/adi,ad7191.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices AD7191 ADC
maintainers:
- Alisa-Dariana Roman <alisa.roman@analog.com>
description: |
Bindings for the Analog Devices AD7191 ADC device. Datasheet can be
found here:
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7191.pdf
The device's PDOWN pin must be connected to the SPI controller's chip select
pin.
properties:
compatible:
enum:
- adi,ad7191
reg:
maxItems: 1
spi-cpol: true
spi-cpha: true
clocks:
maxItems: 1
description:
Must be present when CLKSEL pin is tied HIGH to select external clock
source (either a crystal between MCLK1 and MCLK2 pins, or a
CMOS-compatible clock driving MCLK2 pin). Must be absent when CLKSEL pin
is tied LOW to use the internal 4.92MHz clock.
interrupts:
maxItems: 1
avdd-supply:
description: AVdd voltage supply
dvdd-supply:
description: DVdd voltage supply
vref-supply:
description: Vref voltage supply
odr-gpios:
description:
ODR1 and ODR2 pins for output data rate selection. Should be defined if
adi,odr-value is absent.
minItems: 2
maxItems: 2
adi,odr-value:
$ref: /schemas/types.yaml#/definitions/uint32
description: |
Should be present if ODR pins are pin-strapped. Possible values:
120 Hz (ODR1=0, ODR2=0)
60 Hz (ODR1=0, ODR2=1)
50 Hz (ODR1=1, ODR2=0)
10 Hz (ODR1=1, ODR2=1)
If defined, odr-gpios must be absent.
enum: [120, 60, 50, 10]
pga-gpios:
description:
PGA1 and PGA2 pins for gain selection. Should be defined if adi,pga-value
is absent.
minItems: 2
maxItems: 2
adi,pga-value:
$ref: /schemas/types.yaml#/definitions/uint32
description: |
Should be present if PGA pins are pin-strapped. Possible values:
Gain 1 (PGA1=0, PGA2=0)
Gain 8 (PGA1=0, PGA2=1)
Gain 64 (PGA1=1, PGA2=0)
Gain 128 (PGA1=1, PGA2=1)
If defined, pga-gpios must be absent.
enum: [1, 8, 64, 128]
temp-gpios:
description: TEMP pin for temperature sensor enable.
maxItems: 1
chan-gpios:
description: CHAN pin for input channel selection.
maxItems: 1
required:
- compatible
- reg
- interrupts
- avdd-supply
- dvdd-supply
- vref-supply
- spi-cpol
- spi-cpha
- temp-gpios
- chan-gpios
allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml#
- oneOf:
- required:
- adi,odr-value
- required:
- odr-gpios
- oneOf:
- required:
- adi,pga-value
- required:
- pga-gpios
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
spi {
#address-cells = <1>;
#size-cells = <0>;
adc@0 {
compatible = "adi,ad7191";
reg = <0>;
spi-max-frequency = <1000000>;
spi-cpol;
spi-cpha;
clocks = <&ad7191_mclk>;
interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
interrupt-parent = <&gpio>;
avdd-supply = <&avdd>;
dvdd-supply = <&dvdd>;
vref-supply = <&vref>;
adi,pga-value = <1>;
odr-gpios = <&gpio 23 GPIO_ACTIVE_HIGH>, <&gpio 24 GPIO_ACTIVE_HIGH>;
temp-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
chan-gpios = <&gpio 27 GPIO_ACTIVE_HIGH>;
};
};
|
