linux-kernel - Re: [PATCH 3/3] dt-bindings: iio: adc: add lltc,ltc2309 bindings

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Message-ID: <20230824185054.GA3659959@shaak>
Date:   Thu, 24 Aug 2023 14:50:54 -0400
From:   Liam Beguin <liambeguin@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 3/3] dt-bindings: iio: adc: add lltc,ltc2309 bindings

On Thu, Aug 24, 2023 at 07:56:29PM +0200, Krzysztof Kozlowski wrote:
> On 24/08/2023 18:55, Liam Beguin wrote:
> > Add devicetree bindings for the Linear Technology LTC2309 ADC driver.
> > 
> > Signed-off-by: Liam Beguin <liambeguin@...il.com>
> 
> Thank you for your patch. There is something to discuss/improve.
> 
> > +++ b/Documentation/devicetree/bindings/iio/adc/lltc,ltc2309.yaml
> > @@ -0,0 +1,52 @@
> > +# SPDX-License-Identifier: GPL-2.0
> 
> Wrong license. Run checkpatch before sending patches.
> 

Sorry about that, I ran it through checkpatch but it didn't flag
anything.

> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/adc/lltc,ltc2309.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Linear Technology / Analog Devices LTC2309 ADC
> > +
> > +maintainers:
> > +  - Liam Beguin <liambeguin@...il.com>
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - lltc,ltc2309
> > +
> > +  refcomp-supply:
> > +    description: Power supply for the reference voltage
> 
> refcomp is not a supply. It is called "Reference Buffer Output.". You

That makes sense, I was going for the PIN name from the datasheet.

> probably wanted vref-supply, which suggests you should just add it to
> ltc2497 bindings. I don't see any differences.
> 

I hadn't thought of reusing an existing bindings file for a different
driver. I'll update ltc2497.yaml instead since it avoids duplicating the
whole file.

> > +
> > +  reg:
> > +    enum:
> > +      - 0x08
> > +      - 0x09
> > +      - 0x0a
> > +      - 0x0b
> > +      - 0x18
> > +      - 0x19
> > +      - 0x1a
> > +      - 0x1b
> > +      - 0x28
> > +
> > +  "#io-channel-cells":
> > +    const: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |
> > +    i2c {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        adc@28 {
> > +            #io-channel-cells = <1>;
> > +            compatible = "lltc,ltc2309";
> > +            reg = <0x28>;
> 
> If the example stays, then order is compatible first, then reg, then the
> rest. Also add the supply to make example complete.

Thanks for pointing out the proper order.

> But I think this should be squashed with other binding so no need for
> the example.
> 
> Best regards,
> Krzysztof
> 

Thanks for your time!
Liam