linux-kernel - [PATCH RESEND v3 3/3] arm64: dts: qcom: Add missing TCSR ref clock to the DP PHYs

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Message-Id: <20251014-phy-qcom-edp-add-missing-refclk-v3-3-078be041d06f@linaro.org>
Date: Tue, 14 Oct 2025 12:46:05 +0300
From: Abel Vesa <abel.vesa@...aro.org>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
 Dmitry Baryshkov <lumag@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
 Sibi Sankar <sibi.sankar@....qualcomm.com>, 
 Rajendra Nayak <quic_rjendra@...cinc.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, linux-arm-msm@...r.kernel.org, 
 linux-phy@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Abel Vesa <abel.vesa@...aro.org>, 
 stable@...r.kernel.org
Subject: [PATCH RESEND v3 3/3] arm64: dts: qcom: Add missing TCSR ref clock
 to the DP PHYs

The DP PHYs on X1E80100 need the ref clock which is provided by the
TCSR CC.

The current X Elite devices supported upstream work fine without this
clock, because the boot firmware leaves this clock enabled. But we should
not rely on that. Also, even though this change breaks the ABI, it is
needed in order to make the driver disables this clock along with the
other ones, for a proper bring-down of the entire PHY.

So lets attach it to each of the DP PHYs in order to do that.

Cc: stable@...r.kernel.org # v6.9
Fixes: 1940c25eaa63 ("arm64: dts: qcom: x1e80100: Add display nodes")
Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
---
 arch/arm64/boot/dts/qcom/x1e80100.dtsi | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
index 51576d9c935decbc61a8e4200de83e739f7da814..0db5183cb4c4ea984d6a47987a1a165cacb3c4e7 100644
--- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
@@ -5817,9 +5817,11 @@ mdss_dp2_phy: phy@...2a00 {
 			      <0 0x0aec2000 0 0x1c8>;
 
 			clocks = <&dispcc DISP_CC_MDSS_DPTX2_AUX_CLK>,
-				 <&dispcc DISP_CC_MDSS_AHB_CLK>;
+				 <&dispcc DISP_CC_MDSS_AHB_CLK>,
+				 <&tcsr TCSR_EDP_CLKREF_EN>;
 			clock-names = "aux",
-				      "cfg_ahb";
+				      "cfg_ahb",
+				      "ref";
 
 			power-domains = <&rpmhpd RPMHPD_MX>;
 
@@ -5837,9 +5839,11 @@ mdss_dp3_phy: phy@...5a00 {
 			      <0 0x0aec5000 0 0x1c8>;
 
 			clocks = <&dispcc DISP_CC_MDSS_DPTX3_AUX_CLK>,
-				 <&dispcc DISP_CC_MDSS_AHB_CLK>;
+				 <&dispcc DISP_CC_MDSS_AHB_CLK>,
+				 <&tcsr TCSR_EDP_CLKREF_EN>;
 			clock-names = "aux",
-				      "cfg_ahb";
+				      "cfg_ahb",
+				      "ref";
 
 			power-domains = <&rpmhpd RPMHPD_MX>;
 

-- 
2.48.1