# 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#
$schema:
http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices AD7124 ADC device driver
maintainers:
- Stefan Popa <stefan.popa@analog.com>
description: |
Bindings for the Analog Devices AD7124 ADC device. Datasheet can be
found here:
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7124-8.pdf
properties:
compatible:
enum:
- adi,ad7124-4
- adi,ad7124-8
reg:
description: SPI chip select number for the device
maxItems: 1
clocks:
maxItems: 1
description: phandle to the master clock (mclk)
clock-names:
items:
- const: mclk
interrupts:
description: IRQ line for the ADC
maxItems: 1
rdy-gpios:
description:
GPIO reading the R̅D̅Y̅ line. Having such a GPIO is technically optional but
highly recommended because DOUT/R̅D̅Y̅ toggles during SPI transfers (in its
DOUT aka MISO role) and so usually triggers a spurious interrupt. The
distinction between such a spurious event and a real one can only be done
by reading such a GPIO. (There is a register telling the same
information, but accessing that one needs a SPI transfer which then
triggers another interrupt event.)
maxItems: 1
'#address-cells':
const: 1
'#size-cells':
const: 0
refin1-supply:
description: refin1 supply can be used as reference for conversion.
refin2-supply:
description: refin2 supply can be used as reference for conversion.
avdd-supply:
description: avdd supply can be used as reference for conversion.
required:
- compatible
- reg
- clocks
- clock-names
- interrupts
patternProperties:
"^channel@([0-9]|1[0-5])$":
$ref: adc.yaml
type: object
description: |
Represents the external channels which are connected to the ADC.
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: true
bipolar: true
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
additionalProperties: false
allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml#
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
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>;
rdy-gpios = <&gpio 25 GPIO_ACTIVE_LOW>;
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>;
};
};
};
