0001 # SPDX-License-Identifier: GPL-2.0
0002 %YAML 1.2
0003 ---
0004 $id: http://devicetree.org/schemas/iio/adc/adi,ad7780.yaml#
0005 $schema: http://devicetree.org/meta-schemas/core.yaml#
0006
0007 title: Analog Devices AD7170/AD7171/AD7780/AD7781 analog to digital converters
0008
0009 maintainers:
0010 - Michael Hennerich <michael.hennerich@analog.com>
0011
0012 description: |
0013 The ad7780 is a sigma-delta analog to digital converter. This driver provides
0014 reading voltage values and status bits from both the ad778x and ad717x series.
0015 Its interface also allows writing on the FILTER and GAIN GPIO pins on the
0016 ad778x.
0017
0018 Specifications on the converters can be found at:
0019 AD7170:
0020 https://www.analog.com/media/en/technical-documentation/data-sheets/AD7170.pdf
0021 AD7171:
0022 https://www.analog.com/media/en/technical-documentation/data-sheets/AD7171.pdf
0023 AD7780:
0024 https://www.analog.com/media/en/technical-documentation/data-sheets/ad7780.pdf
0025 AD7781:
0026 https://www.analog.com/media/en/technical-documentation/data-sheets/AD7781.pdf
0027
0028 properties:
0029 compatible:
0030 enum:
0031 - adi,ad7170
0032 - adi,ad7171
0033 - adi,ad7780
0034 - adi,ad7781
0035
0036 reg:
0037 maxItems: 1
0038
0039 avdd-supply:
0040 description:
0041 The regulator supply for the ADC reference voltage.
0042
0043 powerdown-gpios:
0044 description:
0045 Must be the device tree identifier of the PDRST pin. If
0046 specified, it will be asserted during driver probe. As the
0047 line is active high, it should be marked GPIO_ACTIVE_HIGH.
0048 maxItems: 1
0049
0050 adi,gain-gpios:
0051 description:
0052 Must be the device tree identifier of the GAIN pin. Only for
0053 the ad778x chips. If specified, it will be asserted during
0054 driver probe. As the line is active low, it should be marked
0055 GPIO_ACTIVE_LOW.
0056 maxItems: 1
0057
0058 adi,filter-gpios:
0059 description:
0060 Must be the device tree identifier of the FILTER pin. Only
0061 for the ad778x chips. If specified, it will be asserted
0062 during driver probe. As the line is active low, it should be
0063 marked GPIO_ACTIVE_LOW.
0064 maxItems: 1
0065
0066 required:
0067 - compatible
0068 - reg
0069
0070 additionalProperties: false
0071
0072 examples:
0073 - |
0074 #include <dt-bindings/gpio/gpio.h>
0075 spi0 {
0076 #address-cells = <1>;
0077 #size-cells = <0>;
0078
0079 adc@0 {
0080 compatible = "adi,ad7780";
0081 reg = <0>;
0082
0083 avdd-supply = <&vdd_supply>;
0084 powerdown-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
0085 adi,gain-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
0086 adi,filter-gpios = <&gpio2 15 GPIO_ACTIVE_LOW>;
0087 };
0088 };
