linux-kernel - Re: [PATCH] dt-bindings: pwm: st: convert sti-pwm to DT schema

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Date:   Thu, 3 Aug 2023 17:09:31 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Raphaël Gallais-Pou <rgallaispou@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Patrice Chotard <patrice.chotard@...s.st.com>,
        linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: pwm: st: convert sti-pwm to DT schema

On Thu, Aug 03, 2023 at 10:56:45AM +0200, Uwe Kleine-König wrote:
> On Thu, Aug 03, 2023 at 09:18:14AM +0200, Raphaël Gallais-Pou wrote:
> > Hi
> > 
> > Le 02/08/2023 à 10:02, Uwe Kleine-König a écrit :
> > > Hello,
> > > 
> > > On Wed, Aug 02, 2023 at 12:05:59AM +0200, Raphael Gallais-Pou wrote:
> > > > +  st,capture-num-chan:
> > > > +    $ref: "/schemas/types.yaml#/definitions/uint32"
> > > > +    description: Number of available Capture channels.
> > > 
> > > I have the theory that nobody actually uses the capture feature and I'd
> > > like to get rid of it. People who do use it, should better switch to the
> > > counter driver.
> > 
> > TBH I only found two drivers using it, including this one.
> > 
> > $ grep -rinI "\.capture" drivers/pwm/ | wc -l
> > 2
> 
> Right, there is pwm-stm32 and pwm-sti that support capture.
> 
> There are a few machines that have a st,sti-pwm device:
> 
> 	$ grep -rl st,sti-pwm arch/arm/boot/dts/*.dtb
> 	arch/arm/boot/dts/stih407-b2120.dtb
> 	arch/arm/boot/dts/stih410-b2120.dtb
> 	arch/arm/boot/dts/stih410-b2260.dtb
> 	arch/arm/boot/dts/stih418-b2199.dtb
> 	arch/arm/boot/dts/stih418-b2264.dtb
> 
> but to actually use capture the device tree must have a property
> st,capture-num-chan. "st,capture-num-chan" isn't set by any of the
> devices.
> 
> I think for stm32 it's not that trivial to show that it's unused.
> While the capture code isn't a big maintenance burden, I still would
> prefer to get rid of it if nobody uses it. Still more given that there
> are better alternatives available.
> 
> > If there is no opposition about removing this feature I suggest to do it in
> > a second time, in a serie.
> 
> Does that mean you will do that? I guess not, but at least this means
> you're not using capture support.

It seems like it should either be done as part of the conversion or as a
second patch in the series doing the conversion /shrug

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