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 spi-max-frequency: true 70 71 adi,conversion-start-gpios: 72 description: A GPIO used to trigger the start of a conversion 73 maxItems: 1 74 75required: 76 - compatible 77 - reg 78 79additionalProperties: false 80 81allOf: 82 # Devices where reference is vcc 83 - if: 84 properties: 85 compatible: 86 contains: 87 enum: 88 - adi,ad7091 89 - adi,ad7276 90 - adi,ad7277 91 - adi,ad7278 92 - adi,ad7466 93 - adi,ad7467 94 - adi,ad7468 95 - adi,ad7940 96 - ti,adc081s 97 - ti,adc101s 98 - ti,adc121s 99 - ti,ads7866 100 - ti,ads7868 101 required: 102 - vcc-supply 103 # Devices with a vref 104 - if: 105 properties: 106 compatible: 107 contains: 108 enum: 109 - adi,ad7091r 110 - adi,ad7273 111 - adi,ad7274 112 - adi,ad7475 113 - lltc,ltc2314-14 114 then: 115 properties: 116 vref-supply: true 117 else: 118 properties: 119 vref-supply: false 120 # Devices with a vref where it is not optional 121 - if: 122 properties: 123 compatible: 124 contains: 125 enum: 126 - adi,ad7273 127 - adi,ad7274 128 - adi,ad7475 129 - lltc,ltc2314-14 130 then: 131 required: 132 - vref-supply 133 - if: 134 properties: 135 compatible: 136 contains: 137 enum: 138 - adi,ad7475 139 - adi,ad7495 140 then: 141 properties: 142 vdrive-supply: true 143 else: 144 properties: 145 vdrive-supply: false 146 - if: 147 properties: 148 compatible: 149 contains: 150 enum: 151 - adi,ad7091 152 - adi,ad7091r 153 then: 154 properties: 155 adi,conversion-start-gpios: true 156 else: 157 properties: 158 adi,conversion-start-gpios: false 159 160examples: 161 - | 162 spi { 163 #address-cells = <1>; 164 #size-cells = <0>; 165 166 adc@0 { 167 compatible = "adi,ad7091r"; 168 reg = <0>; 169 spi-max-frequency = <5000000>; 170 vcc-supply = <&adc_vcc>; 171 vref-supply = <&adc_vref>; 172 }; 173 }; 174... 175