linux-kernel - Re: [PATCH 1/3] dt-bindings: iio: potentiometer: Add the Renesas X9250 potentiometers

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Date:   Fri, 21 Apr 2023 09:32:57 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Herve Codina <herve.codina@...tlin.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 1/3] dt-bindings: iio: potentiometer: Add the Renesas
 X9250 potentiometers

On 20/04/2023 14:13, Herve Codina wrote:
> The Renesas X9250 is a quad digitally controlled potentiometers.
> 

Thank you for your patch. There is something to discuss/improve.

> +maintainers:
> +  - Herve Codina <herve.codina@...tlin.com>
> +
> +description:
> +  The Renesas X9250 integrates four digitally controlled potentiometers.
> +  On each potentiometer, the X9250T has a 100 kOhms total resistance and the
> +  X9250U has a 50 kOhms total resistance.
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml
> +  - $ref: /schemas/iio/iio.yaml
> +
> +properties:
> +  compatible:
> +    enum:
> +      - renesas,x9250t
> +      - renesas,x9250u
> +
> +  reg:
> +    description:
> +      SPI device address.

SPI bus does not have device addresses, AFAIR. Drop description.

> +    maxItems: 1
> +
> +  '#io-channel-cells':
> +    const: 1
> +
> +  spi-max-frequency:
> +    maximum: 2000000
> +
> +required:
> +  - compatible
> +  - reg
> +  - '#io-channel-cells'
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        x9250@0 {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> +            compatible = "renesas,x9250t";
> +            reg = <0>;
> +            spi-max-frequency = <2000000>;
> +            #io-channel-cells = <1>;
> +        };
> +    };

Best regards,
Krzysztof