linux-kernel - Re: [PATCH v1 1/3] dt-bindings: mmc: Drop unused properties

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Date:   Fri, 1 Sep 2023 16:42:47 +0100
From:   Conor Dooley <conor@...nel.org>
To:     William Qiu <william.qiu@...rfivetech.com>
Cc:     Conor Dooley <conor.dooley@...rochip.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-mmc@...r.kernel.org,
        Emil Renner Berthing <kernel@...il.dk>,
        Rob Herring <robh+dt@...nel.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH v1 1/3] dt-bindings: mmc: Drop unused properties

On Fri, Sep 01, 2023 at 10:33:13AM +0800, William Qiu wrote:
> 
> 
> On 2023/8/30 16:34, Conor Dooley wrote:
> > On Wed, Aug 30, 2023 at 09:29:20AM +0200, Krzysztof Kozlowski wrote:
> >> On 30/08/2023 08:50, Conor Dooley wrote:
> >> > On Wed, Aug 30, 2023 at 11:18:44AM +0800, William Qiu wrote:
> >> >> Due to the change of tuning implementation, it's no longer necessary to
> >> >> use the "starfive,sysreg" property in dts, so drop the relevant
> >> >> description in dt-bindings here.
> >> > 
> >> > How does changing your software implantation invalidate a description of
> >> > the hardware?
> >> > 
> >> 
> >> Which is kind of proof that this syscon was just to substitute
> >> incomplete hardware description (e.g. missing clocks and phys). We
> >> should have rejected it. Just like we should reject them in the future.
> > 
> > :s I dunno what to do with this... I'm inclined to say not to remove it
> > from the binding or dts at all & only change the software.
> > 
> >> There are just few cases where syscon is reasonable. All others is just
> >> laziness. It's not only starfivetech, of course. Several other
> >> contributors do the same.
> > 
> > I'm not sure if laziness is fair, lack of understanding is usually more
> > likely.
> 
> For this, I tend to keep it in binding, but remove it from required. Because
> we only modify the tuning implementation, it doesn't mean that this property
> need to be removed, it's just no longer be the required one.

Please only remove it from required if the current driver doesn't break
if the regmap is removed.

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