linux-kernel - Re: [PATCH] clk: qcom: gdsc: treat optional supplies as optional

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Date: Tue, 26 Mar 2024 08:20:43 +0100
From: Johan Hovold <johan@...nel.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Johan Hovold <johan+linaro@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>, linux-arm-msm@...r.kernel.org,
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: gdsc: treat optional supplies as optional

On Mon, Mar 25, 2024 at 08:21:24PM +0100, Konrad Dybcio wrote:
> On 25.03.2024 3:10 PM, Dmitry Baryshkov wrote:
> > On Mon, 25 Mar 2024 at 16:01, Mark Brown <broonie@...nel.org> wrote:
> >>
> >> On Mon, Mar 25, 2024 at 09:19:57AM +0100, Johan Hovold wrote:
> >>> Since commit deebc79b28d6 ("clk: qcom: gpucc-sc8280xp: Add external
> >>> supply for GX gdsc") the GDSC supply must be treated as optional to
> >>> avoid warnings like:
> >>>
> >>>       gpu_cc-sc8280xp 3d90000.clock-controller: supply vdd-gfx not found, using dummy regulator
> >>>
> >>> on SC8280XP.
> >>
> >> Can this device actually run with the supply physically disconnected?
> > 
> > On SC8280XP this is supplied via power-domain instead of the supply.
> 
> I think Dmitry is asking about this bit:

AFAICT, Dmitry did not ask anything.

> if (ret != -ENODEV)
> 	return ret;
> 
> which is basically repeating the difference that _optional makes

Not sure what you meant by this either. This is how the regulator
subsystem works.

Johan