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dt-bindings: iio: adc: add adi,ad7780.yaml binding 

This patch adds a YAML binding for the Analog Devices AD7780/1 and
AD7170/1 analog-to-digital converters.

Signed-off-by: Renato Lui Geh <renatogeh@gmail.com>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Renato Lui Geh 2019-05-24 22:26:30 -03:00 committed by Jonathan Cameron
parent 13c12f6930
commit 8f69a686e2
2 changed files with 87 additions and 48 deletions
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Documentation/devicetree/bindings/iio/adc/adi,ad7780.txt
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* Analog Devices AD7170/AD7171/AD7780/AD7781
Data sheets:
- AD7170:
* https://www.analog.com/media/en/technical-documentation/data-sheets/AD7170.pdf
- AD7171:
* https://www.analog.com/media/en/technical-documentation/data-sheets/AD7171.pdf
- AD7780:
* https://www.analog.com/media/en/technical-documentation/data-sheets/ad7780.pdf
- AD7781:
* https://www.analog.com/media/en/technical-documentation/data-sheets/AD7781.pdf
Required properties:
- compatible: should be one of
* "adi,ad7170"
* "adi,ad7171"
* "adi,ad7780"
* "adi,ad7781"
- reg: spi chip select number for the device
- vref-supply: the regulator supply for the ADC reference voltage
Optional properties:
- powerdown-gpios: must be the device tree identifier of the PDRST pin. If
specified, it will be asserted during driver probe. As the
line is active high, it should be marked GPIO_ACTIVE_HIGH.
- adi,gain-gpios: must be the device tree identifier of the GAIN pin. Only for
the ad778x chips. If specified, it will be asserted during
driver probe. As the line is active low, it should be marked
GPIO_ACTIVE_LOW.
- adi,filter-gpios: must be the device tree identifier of the FILTER pin. Only
for the ad778x chips. If specified, it will be asserted
during driver probe. As the line is active low, it should be
marked GPIO_ACTIVE_LOW.
Example:
adc@0 {
compatible = "adi,ad7780";
reg = <0>;
vref-supply = <&vdd_supply>
powerdown-gpios = <&gpio 12 GPIO_ACTIVE_HIGH>;
adi,gain-gpios = <&gpio 5 GPIO_ACTIVE_LOW>;
adi,filter-gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
};

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Documentation/devicetree/bindings/iio/adc/adi,ad7780.yaml Normal file
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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/adc/adi,ad7780.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices AD7170/AD7171/AD7780/AD7781 analog to digital converters
maintainers:
- Michael Hennerich <michael.hennerich@analog.com>
description: |
The ad7780 is a sigma-delta analog to digital converter. This driver provides
reading voltage values and status bits from both the ad778x and ad717x series.
Its interface also allows writing on the FILTER and GAIN GPIO pins on the
ad778x.
Specifications on the converters can be found at:
AD7170:
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7170.pdf
AD7171:
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7171.pdf
AD7780:
https://www.analog.com/media/en/technical-documentation/data-sheets/ad7780.pdf
AD7781:
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7781.pdf
properties:
compatible:
enum:
- adi,ad7170
- adi,ad7171
- adi,ad7780
- adi,ad7781
reg:
maxItems: 1
avdd-supply:
description:
The regulator supply for the ADC reference voltage.
maxItems: 1
powerdown-gpios:
description:
Must be the device tree identifier of the PDRST pin. If
specified, it will be asserted during driver probe. As the
line is active high, it should be marked GPIO_ACTIVE_HIGH.
maxItems: 1
adi,gain-gpios:
description:
Must be the device tree identifier of the GAIN pin. Only for
the ad778x chips. If specified, it will be asserted during
driver probe. As the line is active low, it should be marked
GPIO_ACTIVE_LOW.
maxItems: 1
adi,filter-gpios:
description:
Must be the device tree identifier of the FILTER pin. Only
for the ad778x chips. If specified, it will be asserted
during driver probe. As the line is active low, it should be
marked GPIO_ACTIVE_LOW.
maxItems: 1
required:
- compatible
- reg
examples:
- |
#include <dt-bindings/gpio/gpio.h>
spi0 {
#address-cells = <1>;
#size-cells = <0>;
adc@0 {
compatible = "adi,ad7780";
reg = <0>;
avdd-supply = <&vdd_supply>;
powerdown-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
adi,gain-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
adi,filter-gpios = <&gpio2 15 GPIO_ACTIVE_LOW>;
};
};