linux-kernel - [PATCH 3/3] arm64: dts: exynos: gs101: switch to gs101 specific reboot

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Message-Id: <20250627-gs101-reboot3-v1-3-c3ae49657b1f@linaro.org>
Date: Fri, 27 Jun 2025 14:29:32 +0100
From: André Draszik <andre.draszik@...aro.org>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Peter Griffin <peter.griffin@...aro.org>, 
 Tudor Ambarus <tudor.ambarus@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>
Cc: Will McVicker <willmcvicker@...gle.com>, kernel-team@...roid.com, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org, 
 André Draszik <andre.draszik@...aro.org>
Subject: [PATCH 3/3] arm64: dts: exynos: gs101: switch to gs101 specific
 reboot

gs101 (Google Pixel 6 and Pixel 6 Pro) supports cold- and warm-reboot.
Cold-reset is useful because it is more secure, e.g. wiping all RAM
contents, while the warm-reboot allows RAM contents to be retained
across the reboot, e.g. to collect potential crash information.

Add the required DT changes to switch to the gs101-specific reboot
method, which knows how to issue either reset as requested by the OS.

The PMIC plays a role in this as well, so mark it as
'system-power-controller', which in this case ensures that the device
will wake up again after a cold-reboot, ensuring the full power-cycle
is successful.

Signed-off-by: André Draszik <andre.draszik@...aro.org>
---
 arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi | 1 +
 arch/arm64/boot/dts/exynos/google/gs101.dtsi              | 5 +----
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi b/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi
index c1b51f4cfb8c174852b44690f84ed1aa0b4057c2..84ff3e047d3b31b5f96d4d6c78ec933bb05f3e6b 100644
--- a/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi
+++ b/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi
@@ -106,6 +106,7 @@ pmic {
 		interrupts-extended = <&gpa0 6 IRQ_TYPE_LEVEL_LOW>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&pmic_int>;
+		system-power-controller;
 		wakeup-source;
 
 		regulators {
diff --git a/arch/arm64/boot/dts/exynos/google/gs101.dtsi b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
index 7fc3d803de39e654c1e8102b5e0f68995c3ab8e2..79a15fe7d336af3dcd9104d286bea525bb73e9e9 100644
--- a/arch/arm64/boot/dts/exynos/google/gs101.dtsi
+++ b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
@@ -1418,10 +1418,7 @@ poweroff: syscon-poweroff {
 			};
 
 			reboot: syscon-reboot {
-				compatible = "syscon-reboot";
-				offset = <0x3a00>; /* SYSTEM_CONFIGURATION */
-				mask = <0x2>; /* SWRESET_SYSTEM */
-				value = <0x2>; /* reset value */
+				compatible = "google,gs101-reboot";
 			};
 
 			reboot-mode {

-- 
2.50.0.727.gbf7dc18ff4-goog