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

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@kali.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.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@c263000 {
 		restart@c264000 {
 			compatible = "qcom,pshold";
 			reg = <0 0x0c264000 0 0x4>;
+			/* TZ seems to block access */
+			status = "reserved";
 		};
 
 		tsens1: thermal-sensor@c265000 {

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

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