1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) 2# Copyright 2019 Analog Devices Inc. 3%YAML 1.2 4--- 5$id: http://devicetree.org/schemas/iio/adc/adi,ad7476.yaml# 6$schema: http://devicetree.org/meta-schemas/core.yaml# 7 8title: AD7476 and similar simple SPI ADCs from multiple manufacturers. 9 10maintainers: 11 - Michael Hennerich <michael.hennerich@analog.com> 12 13description: | 14 A lot of simple SPI ADCs have very straight forward interfaces. 15 They typically don't provide a MOSI pin, simply reading out data 16 on MISO when the clock toggles. 17 18properties: 19 compatible: 20 enum: 21 - adi,ad7091 22 - adi,ad7091r 23 - adi,ad7273 24 - adi,ad7274 25 - adi,ad7276 26 - adi,ad7277 27 - adi,ad7278 28 - adi,ad7466 29 - adi,ad7467 30 - adi,ad7468 31 - adi,ad7475 32 - adi,ad7476 33 - adi,ad7476a 34 - adi,ad7477 35 - adi,ad7477a 36 - adi,ad7478 37 - adi,ad7478a 38 - adi,ad7495 39 - adi,ad7910 40 - adi,ad7920 41 - adi,ad7940 42 - ti,adc081s 43 - ti,adc101s 44 - ti,adc121s 45 - ti,ads7866 46 - ti,ads7867 47 - ti,ads7868 48 - lltc,ltc2314-14 49 50 reg: 51 maxItems: 1 52 53 vcc-supply: 54 description: 55 Main powersupply voltage for the chips, sometimes referred to as VDD on 56 datasheets. If there is no separate vref-supply, then this is needed 57 to establish channel scaling. 58 59 vdrive-supply: 60 description: 61 Some devices have separate supply for their digital control side. 62 63 vref-supply: 64 description: 65 Some devices have a specific reference voltage supplied on a different pin 66 to the other supplies. Needed to be able to establish channel scaling 67 unless there is also an internal reference available (e.g. ad7091r) 68 69 adi,conversion-start-gpios: 70 description: A GPIO used to trigger the start of a conversion 71 maxItems: 1 72 73required: 74 - compatible 75 - reg 76 77allOf: 78 - $ref: /schemas/spi/spi-peripheral-props.yaml# 79 80 # Devices where reference is vcc 81 - if: 82 properties: 83 compatible: 84 contains: 85 enum: 86 - adi,ad7091 87 - adi,ad7276 88 - adi,ad7277 89 - adi,ad7278 90 - adi,ad7466 91 - adi,ad7467 92 - adi,ad7468 93 - adi,ad7940 94 - ti,adc081s 95 - ti,adc101s 96 - ti,adc121s 97 - ti,ads7866 98 - ti,ads7868 99 then: 100 required: 101 - vcc-supply 102 # Devices with a vref 103 - if: 104 properties: 105 compatible: 106 contains: 107 enum: 108 - adi,ad7091r 109 - adi,ad7273 110 - adi,ad7274 111 - adi,ad7475 112 - lltc,ltc2314-14 113 then: 114 properties: 115 vref-supply: true 116 else: 117 properties: 118 vref-supply: false 119 # Devices with a vref where it is not optional 120 - if: 121 properties: 122 compatible: 123 contains: 124 enum: 125 - adi,ad7273 126 - adi,ad7274 127 - adi,ad7475 128 - lltc,ltc2314-14 129 then: 130 required: 131 - vref-supply 132 - if: 133 properties: 134 compatible: 135 contains: 136 enum: 137 - adi,ad7475 138 - adi,ad7495 139 then: 140 properties: 141 vdrive-supply: true 142 else: 143 properties: 144 vdrive-supply: false 145 - if: 146 properties: 147 compatible: 148 contains: 149 enum: 150 - adi,ad7091 151 - adi,ad7091r 152 then: 153 properties: 154 adi,conversion-start-gpios: true 155 else: 156 properties: 157 adi,conversion-start-gpios: false 158 159unevaluatedProperties: false 160 161examples: 162 - | 163 spi { 164 #address-cells = <1>; 165 #size-cells = <0>; 166 167 adc@0 { 168 compatible = "adi,ad7091r"; 169 reg = <0>; 170 spi-max-frequency = <5000000>; 171 vcc-supply = <&adc_vcc>; 172 vref-supply = <&adc_vref>; 173 }; 174 }; 175... 176