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GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)

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# Copyright 2019 Analog Devices Inc.

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%YAML 1.2

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---

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$id: http://devicetree.org/schemas/iio/adc/adi,ad7476.yaml#

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$schema: http://devicetree.org/meta-schemas/core.yaml#

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title: AD7476 and similar simple SPI ADCs from multiple manufacturers.

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maintainers:

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  - Michael Hennerich <michael.hennerich@analog.com>

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description: |

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  A lot of simple SPI ADCs have very straight forward interfaces.

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  They typically don't provide a MOSI pin, simply reading out data

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  on MISO when the clock toggles.

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properties:

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  compatible:

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    oneOf:

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      - items:

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          - enum:

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              - adi,ad7091

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              - adi,ad7091r

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              - adi,ad7273

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              - adi,ad7274

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              - adi,ad7276

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              - adi,ad7277

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              - adi,ad7278

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              - adi,ad7466

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              - adi,ad7467

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              - adi,ad7468

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              - adi,ad7475

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              - adi,ad7476

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              - adi,ad7476a

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              - adi,ad7477

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              - adi,ad7477a

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              - adi,ad7478

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              - adi,ad7478a

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              - adi,ad7495

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              - adi,ad7910

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              - adi,ad7920

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              - adi,ad7940

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              - ti,adc081s

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              - ti,adc101s

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              - ti,adc121s

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              - ti,ads7866

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              - ti,ads7867

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              - ti,ads7868

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              - lltc,ltc2314-14

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      - items:

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          - const: rohm,bu79100g

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          - const: ti,ads7866

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  reg:

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    maxItems: 1

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  vcc-supply:

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    description:

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      Main powersupply voltage for the chips, sometimes referred to as VDD on

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      datasheets.  If there is no separate vref-supply, then this is needed

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      to establish channel scaling.

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  vdrive-supply:

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    description:

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      Some devices have separate supply for their digital control side.

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  vref-supply:

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    description:

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      Some devices have a specific reference voltage supplied on a different pin

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      to the other supplies. Needed to be able to establish channel scaling

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      unless there is also an internal reference available (e.g. ad7091r)

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  adi,conversion-start-gpios:

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    description: A GPIO used to trigger the start of a conversion

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    maxItems: 1

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required:

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  - compatible

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  - reg

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allOf:

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  - $ref: /schemas/spi/spi-peripheral-props.yaml#

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  # Devices where reference is vcc

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  - if:

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      properties:

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        compatible:

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          contains:

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            enum:

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              - adi,ad7091

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              - adi,ad7276

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              - adi,ad7277

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              - adi,ad7278

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              - adi,ad7466

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              - adi,ad7467

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              - adi,ad7468

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              - adi,ad7940

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              - ti,adc081s

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              - ti,adc101s

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              - ti,adc121s

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              - ti,ads7866

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              - ti,ads7868

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    then:

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      required:

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        - vcc-supply

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  # Devices with a vref

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  - if:

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      properties:

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        compatible:

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          contains:

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            enum:

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              - adi,ad7091r

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              - adi,ad7273

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              - adi,ad7274

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              - adi,ad7475

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              - lltc,ltc2314-14

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    then:

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      properties:

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        vref-supply: true

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    else:

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      properties:

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        vref-supply: false

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  # Devices with a vref where it is not optional

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  - if:

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      properties:

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        compatible:

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          contains:

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            enum:

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              - adi,ad7273

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              - adi,ad7274

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              - adi,ad7475

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              - lltc,ltc2314-14

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    then:

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      required:

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        - vref-supply

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  - if:

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      properties:

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        compatible:

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          contains:

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            enum:

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              - adi,ad7475

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              - adi,ad7495

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    then:

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      properties:

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        vdrive-supply: true

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    else:

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      properties:

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        vdrive-supply: false

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  - if:

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      properties:

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        compatible:

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          contains:

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            enum:

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              - adi,ad7091

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              - adi,ad7091r

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    then:

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      properties:

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        adi,conversion-start-gpios: true

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    else:

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      properties:

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        adi,conversion-start-gpios: false

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unevaluatedProperties: false

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examples:

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  - |

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    spi {

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      #address-cells = <1>;

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      #size-cells = <0>;

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      adc@0 {

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        compatible = "adi,ad7091r";

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        reg = <0>;

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        spi-max-frequency = <5000000>;

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        vcc-supply = <&adc_vcc>;

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        vref-supply = <&adc_vref>;

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      };

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    };

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...

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