linux-kernel - [PATCH] arm64: dts: qcom: sc8280xp: Set status = "reserved" on PSHOLD

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Message-Id: <20240510-topic-8280_off-v1-1-bcc70cda449e@linaro.org>
Date: Fri, 10 May 2024 15:39:59 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Johan Hovold <johan+linaro@...nel.org>, 
 Steev Klimaszewski <steev@...i.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH] arm64: dts: qcom: sc8280xp: Set status = "reserved" on
 PSHOLD

On most devices, TZ seems to be blocking access to the PSHOLD reboot
register. This seems to be TZ, as even kicking the hypervisor doesn't
seem to make it writable.

Fixes: 865ff2e6f5da ("arm64: dts: qcom: sc8280xp: Add PS_HOLD restart")
Reported-by: Steev Klimaszewski <steev@...i.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
index 0549ba1fbeea..59f0a850671a 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
@@ -4623,6 +4623,8 @@ tsens0: thermal-sensor@...3000 {
 		restart@...4000 {
 			compatible = "qcom,pshold";
 			reg = <0 0x0c264000 0 0x4>;
+			/* TZ seems to block access */
+			status = "reserved";
 		};
 
 		tsens1: thermal-sensor@...5000 {

---
base-commit: 704ba27ac55579704ba1289392448b0c66b56258
change-id: 20240510-topic-8280_off-11539fc57f98

Best regards,
-- 
Konrad Dybcio <konrad.dybcio@...aro.org>