linux-kernel - Re: [PATCH 1/5] dt-bindings: clock: qcom: add SA8540P gpucc

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Date: Thu, 28 Mar 2024 16:43:14 +0100
From: Johan Hovold <johan@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,
	Johan Hovold <johan+linaro@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Mark Brown <broonie@...nel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] dt-bindings: clock: qcom: add SA8540P gpucc

On Wed, Mar 27, 2024 at 09:54:09AM +0100, Krzysztof Kozlowski wrote:
> On 26/03/2024 17:40, Johan Hovold wrote:
> > On Tue, Mar 26, 2024 at 04:59:43PM +0100, Krzysztof Kozlowski wrote:
> >> On 26/03/2024 15:01, Johan Hovold wrote:
> >>> The SA8540P platform is closely related to SC8280XP but differs in that
> >>> it uses an external supply for the GX power domain.
> >>>
> >>> Add a new compatible string for the SA8540P GPU clock controller so that
> >>> the OS can determine which resources to look for.
> >>>
> >>> Fixes: e60b95d2b687 ("dt-bindings: clock: qcom: Allow VDD_GFX supply to GX")
> >>
> >> I don't get why adding new device support is a fix. Commit msg did not
> >> help me to understand it.
> > 
> > Yeah, perhaps I could have expanded on the problem a bit more here.
> > 
> > Hopefully it's clear if you look at the cover letter, but the commit
> > referred to above should have added a new compatible for SA8540P which
> > uses the new supply so that the OS can determine when it should try to
> > look it up and when it is required.
> > 
> > The Fixes tag can also be dropped, I admit this is not clear-cut.
> 
> Some sort of short explanation would be good in the commit msg, so Fixes
> can stay.

There is an explanation in the commit message, but I agree that it could
be expanded.

After talking to Bjorn about this yesterday, he convinced me that simply
treating the supply as optional is the right thing to do here.

Apparently it is possible to us an external supply also on sc8280xp.
There's more to the story, and I don't have access to the documentation,
but we'll go with the simpler:

	https://lore.kernel.org/lkml/20240325081957.10946-1-johan+linaro@kernel.org/

for now.

Johan