0001 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
0002 # Copyright 2019 Analog Devices Inc.
0003 %YAML 1.2
0004 ---
0005 $id: http://devicetree.org/schemas/iio/adc/adi,ad7476.yaml#
0006 $schema: http://devicetree.org/meta-schemas/core.yaml#
0007
0008 title: AD7476 and similar simple SPI ADCs from multiple manufacturers.
0009
0010 maintainers:
0011 - Michael Hennerich <michael.hennerich@analog.com>
0012
0013 description: |
0014 A lot of simple SPI ADCs have very straight forward interfaces.
0015 They typically don't provide a MOSI pin, simply reading out data
0016 on MISO when the clock toggles.
0017
0018 properties:
0019 compatible:
0020 enum:
0021 - adi,ad7091
0022 - adi,ad7091r
0023 - adi,ad7273
0024 - adi,ad7274
0025 - adi,ad7276
0026 - adi,ad7277
0027 - adi,ad7278
0028 - adi,ad7466
0029 - adi,ad7467
0030 - adi,ad7468
0031 - adi,ad7475
0032 - adi,ad7476
0033 - adi,ad7476a
0034 - adi,ad7477
0035 - adi,ad7477a
0036 - adi,ad7478
0037 - adi,ad7478a
0038 - adi,ad7495
0039 - adi,ad7910
0040 - adi,ad7920
0041 - adi,ad7940
0042 - ti,adc081s
0043 - ti,adc101s
0044 - ti,adc121s
0045 - ti,ads7866
0046 - ti,ads7867
0047 - ti,ads7868
0048 - lltc,ltc2314-14
0049
0050 reg:
0051 maxItems: 1
0052
0053 vcc-supply:
0054 description:
0055 Main powersupply voltage for the chips, sometimes referred to as VDD on
0056 datasheets. If there is no separate vref-supply, then this is needed
0057 to establish channel scaling.
0058
0059 vdrive-supply:
0060 description:
0061 Some devices have separate supply for their digital control side.
0062
0063 vref-supply:
0064 description:
0065 Some devices have a specific reference voltage supplied on a different pin
0066 to the other supplies. Needed to be able to establish channel scaling
0067 unless there is also an internal reference available (e.g. ad7091r)
0068
0069 spi-max-frequency: true
0070
0071 adi,conversion-start-gpios:
0072 description: A GPIO used to trigger the start of a conversion
0073 maxItems: 1
0074
0075 required:
0076 - compatible
0077 - reg
0078
0079 additionalProperties: false
0080
0081 allOf:
0082 # Devices where reference is vcc
0083 - if:
0084 properties:
0085 compatible:
0086 contains:
0087 enum:
0088 - adi,ad7091
0089 - adi,ad7276
0090 - adi,ad7277
0091 - adi,ad7278
0092 - adi,ad7466
0093 - adi,ad7467
0094 - adi,ad7468
0095 - adi,ad7940
0096 - ti,adc081s
0097 - ti,adc101s
0098 - ti,adc121s
0099 - ti,ads7866
0100 - ti,ads7868
0101 then:
0102 required:
0103 - vcc-supply
0104 # Devices with a vref
0105 - if:
0106 properties:
0107 compatible:
0108 contains:
0109 enum:
0110 - adi,ad7091r
0111 - adi,ad7273
0112 - adi,ad7274
0113 - adi,ad7475
0114 - lltc,ltc2314-14
0115 then:
0116 properties:
0117 vref-supply: true
0118 else:
0119 properties:
0120 vref-supply: false
0121 # Devices with a vref where it is not optional
0122 - if:
0123 properties:
0124 compatible:
0125 contains:
0126 enum:
0127 - adi,ad7273
0128 - adi,ad7274
0129 - adi,ad7475
0130 - lltc,ltc2314-14
0131 then:
0132 required:
0133 - vref-supply
0134 - if:
0135 properties:
0136 compatible:
0137 contains:
0138 enum:
0139 - adi,ad7475
0140 - adi,ad7495
0141 then:
0142 properties:
0143 vdrive-supply: true
0144 else:
0145 properties:
0146 vdrive-supply: false
0147 - if:
0148 properties:
0149 compatible:
0150 contains:
0151 enum:
0152 - adi,ad7091
0153 - adi,ad7091r
0154 then:
0155 properties:
0156 adi,conversion-start-gpios: true
0157 else:
0158 properties:
0159 adi,conversion-start-gpios: false
0160
0161 examples:
0162 - |
0163 spi {
0164 #address-cells = <1>;
0165 #size-cells = <0>;
0166
0167 adc@0 {
0168 compatible = "adi,ad7091r";
0169 reg = <0>;
0170 spi-max-frequency = <5000000>;
0171 vcc-supply = <&adc_vcc>;
0172 vref-supply = <&adc_vref>;
0173 };
0174 };
0175 ...
