linux-kernel - [PATCH RFC 07/24] arm64: dts: qcom: sa8540p: Describe GPU

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Message-Id: <20250728-topic-gpucc_power_plumbing-v1-7-09c2480fe3e6@oss.qualcomm.com>
Date: Mon, 28 Jul 2025 18:16:07 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Ulf Hansson <ulf.hansson@...aro.org>, 
 Johan Hovold <johan+linaro@...nel.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Taniya Das <taniya.das@....qualcomm.com>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Taniya Das <quic_tdas@...cinc.com>, 
 Imran Shaik <quic_imrashai@...cinc.com>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
 Dmitry Baryshkov <lumag@...nel.org>, cros-qcom-dts-watchers@...omium.org, 
 Douglas Anderson <dianders@...omium.org>, Vinod Koul <vkoul@...nel.org>, 
 Richard Acayan <mailingradian@...il.com>, 
 Andy Gross <andy.gross@...aro.org>, Ajit Pandey <quic_ajipan@...cinc.com>, 
 Luca Weiss <luca.weiss@...rphone.com>, Jonathan Marek <jonathan@...ek.ca>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jagadeesh Kona <quic_jkona@...cinc.com>, 
 Akhil P Oommen <akhilpo@....qualcomm.com>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org, 
 devicetree@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH RFC 07/24] arm64: dts: qcom: sa8540p: Describe GPU_CC power
 plumbing requirements

From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

A number of power rails must be powered on in order for GPU_CC to
function. Ensure that's conveyed to the OS.

Fixes: eec51ab2fd6f ("arm64: dts: qcom: sc8280xp: Add GPU related nodes")
Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
---
 arch/arm64/boot/dts/qcom/sa8540p.dtsi | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/sa8540p.dtsi b/arch/arm64/boot/dts/qcom/sa8540p.dtsi
index 23888029cc117956d8531c423c3249e897ede0d9..96fac8b20cffcce2670d71499d5b9831dfcdcc94 100644
--- a/arch/arm64/boot/dts/qcom/sa8540p.dtsi
+++ b/arch/arm64/boot/dts/qcom/sa8540p.dtsi
@@ -168,8 +168,12 @@ opp-2592000000 {
 };
 
 &gpucc {
+	compatible = "qcom,sa8540p-gpucc", "qcom,sc8280xp-gpucc";
+
 	/* SA8295P and SA8540P doesn't provide gfx.lvl */
-	/delete-property/ power-domains;
+	power-domains = <&rpmhpd SC8280XP_CX>,
+			<&rpmhpd SC8280XP_MX>,
+			<&rpmhpd SC8280XP_MXC>;
 
 	status = "disabled";
 };

-- 
2.50.1