| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 | |
| 8 | title: AD7476 and similar simple SPI ADCs from multiple manufacturers. |
| 9 | |
| 10 | maintainers: |
| 11 | - Michael Hennerich <michael.hennerich@analog.com> |
| 12 | |
| 13 | description: | |
| 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 | |
| 18 | properties: |
| 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 | |
| 73 | required: |
| 74 | - compatible |
| 75 | - reg |
| 76 | |
| 77 | allOf: |
| 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 | |
| 159 | unevaluatedProperties: false |
| 160 | |
| 161 | examples: |
| 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 | ... |