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Date: Sat, 13 Apr 2024 23:19:05 +0200
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Subject: Re: [PATCH v5 4/5] dt-bindings: iio: adc: ad7192: Add AD7194 support
To: Alisa-Dariana Roman <alisadariana@gmail.com>,
 michael.hennerich@analog.com, linux-iio@vger.kernel.org,
 devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: alexandru.tachici@analog.com, lars@metafoo.de, jic23@kernel.org,
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References: <20240413151152.165682-1-alisa.roman@analog.com>
 <20240413151152.165682-5-alisa.roman@analog.com>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <20240413151152.165682-5-alisa.roman@analog.com>
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On 13/04/2024 17:11, Alisa-Dariana Roman wrote:
> Unlike the other AD719Xs, AD7194 has configurable differential
> channels. The user can dynamically configure them in the devicetree.
> 
> Also add an example for AD7194 devicetree.
> 
> Signed-off-by: Alisa-Dariana Roman <alisa.roman@analog.com>
> ---
>  .../bindings/iio/adc/adi,ad7192.yaml          | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> index ba506af3b73e..855f0a2d7d75 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> @@ -21,8 +21,15 @@ properties:
>        - adi,ad7190
>        - adi,ad7192
>        - adi,ad7193
> +      - adi,ad7194
>        - adi,ad7195
>  
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
>    reg:
>      maxItems: 1
>  
> @@ -104,8 +111,43 @@ required:
>    - spi-cpol
>    - spi-cpha
>  
> +patternProperties:

This goes after properties:, so before required: block.

> +  "^channel@[0-9]+$":

Why restricting the pattern? If you have 256 channels, how are you going
to encode it?

> +    type: object
> +    $ref: adc.yaml
> +    unevaluatedProperties: false
> +
> +    properties:
> +      reg:
> +        description: The channel index.
> +        minimum: 1
> +        maximum: 256
> +
> +      diff-channels:
> +        description: |
> +          Both inputs can be connected to pins AIN1 to AIN16 by choosing the
> +          appropriate value from 1 to 16.
> +        items:
> +          minimum: 1
> +          maximum: 16
> +
> +    required:
> +      - reg
> +      - diff-channels
> +
>  allOf:
>    - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - adi,ad7190
> +            - adi,ad7192
> +            - adi,ad7193
> +            - adi,ad7195
> +    then:
> +      patternProperties:
> +        "^channel@[0-9]+$": false
>  
>  unevaluatedProperties: false
>  
> @@ -136,3 +178,35 @@ examples:
>              adi,burnout-currents-enable;
>          };
>      };
> +  - |
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        adc@0 {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            compatible = "adi,ad7194";
> +            reg = <0>;

compatible is always the first property. reg is second.


Best regards,
Krzysztof