linux-kernel - Re: [PATCH v2 1/4] dt-bindings: iio: adc: ad7192: Add properties

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Date:   Sun, 26 Nov 2023 16:11:02 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Alisa-Dariana Roman <alisadariana@...il.com>,
        Alisa-Dariana Roman <alisa.roman@...log.com>,
        Michael Hennerich <michael.hennerich@...log.com>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH v2 1/4] dt-bindings: iio: adc: ad7192: Add properties

On Tue, 14 Nov 2023 21:29:58 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 14/11/2023 21:05, Alisa-Dariana Roman wrote:
> > Document properties used for clock configuration.  
> 
> Some background here is missing - otherwise it looks like you are adding
> new properties...
> 
> > 
> > Signed-off-by: Alisa-Dariana Roman <alisa.roman@...log.com>
> > ---
> >  .../devicetree/bindings/iio/adc/adi,ad7192.yaml        | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> > index 16def2985ab4..9b59d6eea368 100644
> > --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> > +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> > @@ -80,6 +80,16 @@ properties:
> >        and when chop is disabled.
> >      type: boolean
> >  
> > +  adi,clock-xtal:
> > +    description: |
> > +      External crystal connected from MCLK1 to MCLK2.  
> 
> And this should be input clock.

Fair enough. We've been doing this wrong for a while then, but good not
to do it in new bindings.

It's a bit of an oddity as arguably it's just putting an analog component
in as part of an internally generated clock signal.
A clock binding provides info that the crystal is present though I guess,
even though if you actually connected a conventional clock there it
wouldn't work.

> 
> > +    type: boolean
> > +
> > +  adi,int-clock-output-enable:
> > +    description: |
> > +      Internal 4.92 MHz clock available on MCLK2 pin.
> > +    type: boolean  
> 
> This should be clock-cells and clock provider.
> 
> Unless you are just documenting already used interface which you do not
> want to break...
> 
> > +
> >    bipolar:
> >      description: see Documentation/devicetree/bindings/iio/adc/adc.yaml
> >      type: boolean  
> 
> Best regards,
> Krzysztof
>