linux-kernel - [PATCH 0/5] clk: qcom: gpucc-sc8280xp: fix GX external supply lookup

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Message-ID: <20240326140108.21307-1-johan+linaro@kernel.org>
Date: Tue, 26 Mar 2024 15:01:03 +0100
From: Johan Hovold <johan+linaro@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>
Cc: 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,
	Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH 0/5] clk: qcom: gpucc-sc8280xp: fix GX external supply lookup

The SA8540P platform is closely related to SC8280XP but differs in that
it uses an external supply for the GX power domain.

This series adds a new SA8540P GPU clock controller compatible which
can be used to determine whether to look up the external supply.

This specifically avoids warnings such as:

	gpu_cc-sc8280xp 3d90000.clock-controller: supply vdd-gfx not found, using dummy regulator

on SC8280XP, which were introduced in 6.9-rc1.

Note that this also avoids triggering a potential deadlock on SC8280XP
even if the underlying issue still remains for the derivative platforms
like SA8540P and SA8295P that actually use the supply. [1]

Also note that this is a better alternative to simply making the
external supply optional as that would suppress any warnings about
missing supplies on platforms that actually require it. This series
therefore supersedes [2].

Johan

[1] https://lore.kernel.org/lkml/Zf25Sv2x9WaCFuIH@hovoldconsulting.com/
[2] https://lore.kernel.org/lkml/20240325081957.10946-1-johan+linaro@kernel.org/

Johan Hovold (5):
  dt-bindings: clock: qcom: add SA8540P gpucc
  arm64: dts: qcom: sa8540p: use sa8540p gpucc compatible
  clk: qcom: gpucc-sc8280xp: make cc descriptor const
  clk: qcom: gpucc-sc8280xp: fix GX external supply lookup
  arm64: dts: qcom: sa8540p: drop fallback gpucc compatible

 .../devicetree/bindings/clock/qcom,gpucc.yaml |  1 +
 arch/arm64/boot/dts/qcom/sa8540p.dtsi         |  2 +
 drivers/clk/qcom/gpucc-sc8280xp.c             | 42 ++++++++++++++++---
 3 files changed, 39 insertions(+), 6 deletions(-)

-- 
2.43.0