linux-kernel - Re: [PATCH v2 1/2] dt-bindings: adc: ad7173: add support for additional models

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Message-ID: <CAMknhBE1dO921gCudJMiH=HhMpgNsORwaejw7z-O2gCbLbrdCg@mail.gmail.com>
Date: Mon, 4 Mar 2024 17:41:40 -0600
From: David Lechner <dlechner@...libre.com>
To: Dumitru Ceclan <mitrutzceclan@...il.com>
Cc: Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Ceclan Dumitru <dumitru.ceclan@...log.com>, linux-iio@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: adc: ad7173: add support for
 additional models

On Wed, Feb 28, 2024 at 7:55 AM Dumitru Ceclan <mitrutzceclan@...ilcom> wrote:
>
> Add support for: AD7172-2, AD7175-8, AD7177-2.
> AD7172-4 does not feature an internal reference, check for external
>  reference presence.
>
> Signed-off-by: Dumitru Ceclan <mitrutzceclan@...il.com>
> ---
>  .../bindings/iio/adc/adi,ad7173.yaml          | 39 +++++++++++++++++--
>  1 file changed, 36 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
> index 36f16a325bc5..7b5bb839fc3e 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
> @@ -21,17 +21,23 @@ description: |
>
>    Datasheets for supported chips:
>      https://www.analog.com/media/en/technical-documentation/data-sheets/AD7172-2.pdf
> +    https://www.analog.com/media/en/technical-documentation/data-sheets/AD7172-4.pdf
>      https://www.analog.com/media/en/technical-documentation/data-sheets/AD7173-8.pdf
>      https://www.analog.com/media/en/technical-documentation/data-sheets/AD7175-2.pdf
> +    https://www.analog.com/media/en/technical-documentation/data-sheets/AD7175-8.pdf
>      https://www.analog.com/media/en/technical-documentation/data-sheets/AD7176-2.pdf
> +    https://www.analog.com/media/en/technical-documentation/data-sheets/AD7177-2.pdf
>
>  properties:
>    compatible:
>      enum:
>        - adi,ad7172-2
> +      - adi,ad7172-4
>        - adi,ad7173-8
>        - adi,ad7175-2
> +      - adi,ad7175-8
>        - adi,ad7176-2
> +      - adi,ad7177-2
>
>    reg:
>      maxItems: 1
> @@ -136,8 +142,10 @@ patternProperties:
>            refout-avss: REFOUT/AVSS (Internal reference)
>            avdd       : AVDD  /AVSS
>
> -          External reference ref2 only available on ad7173-8.
> -          If not specified, internal reference used.
> +          External reference ref2 only available on ad7173-8 and ad7172-4.
> +          Internal reference refout-avss not available on ad7172-4.
> +
> +          If not specified, internal reference used (if available).
>          $ref: /schemas/types.yaml#/definitions/string
>          enum:
>            - vref
> @@ -157,12 +165,15 @@ required:
>  allOf:
>    - $ref: /schemas/spi/spi-peripheral-props.yaml#
>
> +  # Only ad7172-4 and ad7173-8 support vref2
>    - if:
>        properties:
>          compatible:
>            not:
>              contains:
> -              const: adi,ad7173-8
> +              anyOf:
> +                - const: adi,ad7172-4
> +                - const: adi,ad7173-8

According to the datasheets, it looks like adi,ad7175-8 should be
included here too.

>      then:
>        properties:
>          vref2-supply: false
> @@ -177,6 +188,28 @@ allOf:
>              reg:
>                maximum: 3
>
> +  # Model ad7172-4 does not support internal reference
> +  #  mandatory to have an external reference
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: adi,ad7172-4
> +    then:
> +      patternProperties:
> +        "^channel@[0-9a-f]$":
> +          properties:
> +            adi,reference-select:
> +              enum:
> +                - vref
> +                - vref2
> +                - avdd
> +          required:
> +            - adi,reference-select
> +      oneOf:
> +        - required: [vref2-supply]
> +        - required: [vref-supply]

Do these actually need to be required since avdd is also a possibility?

> +
>    - if:
>        anyOf:
>          - required: [clock-names]
> --
> 2.43.0
>