linux-kernel - [PATCH 3/4] arm64: dts: qcom: sc8280xp: Add PS

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Message-Id: <20240307-topic-8280_nodes-v1-3-4eba20e08902@linaro.org>
Date: Thu, 07 Mar 2024 21:25:56 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
 Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.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>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 3/4] arm64: dts: qcom: sc8280xp: Add PS_HOLD restart

Killing the platform with a single write and no firmware involvement is
pretty cool, add support for it.

Note that due to restart notifier priority settings, PSCI reset will
be used instead, unless:

a) PSCI is not exposed by the firmware (e.g. because the fw was replaced)
or
b) PSCI restart fails for some reason

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
index a3725d917bef..44c8d543eb67 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
@@ -4460,6 +4460,11 @@ tsens0: thermal-sensor@...3000 {
 			#thermal-sensor-cells = <1>;
 		};
 
+		restart@...4000 {
+			compatible = "qcom,pshold";
+			reg = <0 0x0c264000 0 0x4>;
+		};
+
 		tsens1: thermal-sensor@...5000 {
 			compatible = "qcom,sc8280xp-tsens", "qcom,tsens-v2";
 			reg = <0 0x0c265000 0 0x1ff>, /* TM */

-- 
2.40.1