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

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Message-ID: <20230421100141.2ad95eb7@bootlin.com>
Date:   Fri, 21 Apr 2023 10:01:41 +0200
From:   Herve Codina <herve.codina@...tlin.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        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

Hi Krzysztof,

On Fri, 21 Apr 2023 09:32:57 +0200
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> 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.

Indeed, SPI has chip-select.
I will drop the 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

Will be change to potentiometer@0

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

The modifications will be present on v3 as v2 was already sent.

Thanks for the review,
Hervé