1*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun%YAML 1.2 3*4882a593Smuzhiyun--- 4*4882a593Smuzhiyun$id: http://devicetree.org/schemas/iio/adc/adi,ad7780.yaml# 5*4882a593Smuzhiyun$schema: http://devicetree.org/meta-schemas/core.yaml# 6*4882a593Smuzhiyun 7*4882a593Smuzhiyuntitle: Analog Devices AD7170/AD7171/AD7780/AD7781 analog to digital converters 8*4882a593Smuzhiyun 9*4882a593Smuzhiyunmaintainers: 10*4882a593Smuzhiyun - Michael Hennerich <michael.hennerich@analog.com> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyundescription: | 13*4882a593Smuzhiyun The ad7780 is a sigma-delta analog to digital converter. This driver provides 14*4882a593Smuzhiyun reading voltage values and status bits from both the ad778x and ad717x series. 15*4882a593Smuzhiyun Its interface also allows writing on the FILTER and GAIN GPIO pins on the 16*4882a593Smuzhiyun ad778x. 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun Specifications on the converters can be found at: 19*4882a593Smuzhiyun AD7170: 20*4882a593Smuzhiyun https://www.analog.com/media/en/technical-documentation/data-sheets/AD7170.pdf 21*4882a593Smuzhiyun AD7171: 22*4882a593Smuzhiyun https://www.analog.com/media/en/technical-documentation/data-sheets/AD7171.pdf 23*4882a593Smuzhiyun AD7780: 24*4882a593Smuzhiyun https://www.analog.com/media/en/technical-documentation/data-sheets/ad7780.pdf 25*4882a593Smuzhiyun AD7781: 26*4882a593Smuzhiyun https://www.analog.com/media/en/technical-documentation/data-sheets/AD7781.pdf 27*4882a593Smuzhiyun 28*4882a593Smuzhiyunproperties: 29*4882a593Smuzhiyun compatible: 30*4882a593Smuzhiyun enum: 31*4882a593Smuzhiyun - adi,ad7170 32*4882a593Smuzhiyun - adi,ad7171 33*4882a593Smuzhiyun - adi,ad7780 34*4882a593Smuzhiyun - adi,ad7781 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun reg: 37*4882a593Smuzhiyun maxItems: 1 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun avdd-supply: 40*4882a593Smuzhiyun description: 41*4882a593Smuzhiyun The regulator supply for the ADC reference voltage. 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun powerdown-gpios: 44*4882a593Smuzhiyun description: 45*4882a593Smuzhiyun Must be the device tree identifier of the PDRST pin. If 46*4882a593Smuzhiyun specified, it will be asserted during driver probe. As the 47*4882a593Smuzhiyun line is active high, it should be marked GPIO_ACTIVE_HIGH. 48*4882a593Smuzhiyun maxItems: 1 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun adi,gain-gpios: 51*4882a593Smuzhiyun description: 52*4882a593Smuzhiyun Must be the device tree identifier of the GAIN pin. Only for 53*4882a593Smuzhiyun the ad778x chips. If specified, it will be asserted during 54*4882a593Smuzhiyun driver probe. As the line is active low, it should be marked 55*4882a593Smuzhiyun GPIO_ACTIVE_LOW. 56*4882a593Smuzhiyun maxItems: 1 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun adi,filter-gpios: 59*4882a593Smuzhiyun description: 60*4882a593Smuzhiyun Must be the device tree identifier of the FILTER pin. Only 61*4882a593Smuzhiyun for the ad778x chips. If specified, it will be asserted 62*4882a593Smuzhiyun during driver probe. As the line is active low, it should be 63*4882a593Smuzhiyun marked GPIO_ACTIVE_LOW. 64*4882a593Smuzhiyun maxItems: 1 65*4882a593Smuzhiyun 66*4882a593Smuzhiyunrequired: 67*4882a593Smuzhiyun - compatible 68*4882a593Smuzhiyun - reg 69*4882a593Smuzhiyun 70*4882a593SmuzhiyunadditionalProperties: false 71*4882a593Smuzhiyun 72*4882a593Smuzhiyunexamples: 73*4882a593Smuzhiyun - | 74*4882a593Smuzhiyun #include <dt-bindings/gpio/gpio.h> 75*4882a593Smuzhiyun spi0 { 76*4882a593Smuzhiyun #address-cells = <1>; 77*4882a593Smuzhiyun #size-cells = <0>; 78*4882a593Smuzhiyun 79*4882a593Smuzhiyun adc@0 { 80*4882a593Smuzhiyun compatible = "adi,ad7780"; 81*4882a593Smuzhiyun reg = <0>; 82*4882a593Smuzhiyun 83*4882a593Smuzhiyun avdd-supply = <&vdd_supply>; 84*4882a593Smuzhiyun powerdown-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>; 85*4882a593Smuzhiyun adi,gain-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>; 86*4882a593Smuzhiyun adi,filter-gpios = <&gpio2 15 GPIO_ACTIVE_LOW>; 87*4882a593Smuzhiyun }; 88*4882a593Smuzhiyun }; 89