linux-kernel - [PATCH v1 2/2] arm64: dts: exynos8895: Add syscon-poweroff and syscon-reboot nodes

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Message-ID: <20241210180216.398165-3-ivo.ivanov.ivanov1@gmail.com>
Date: Tue, 10 Dec 2024 20:02:16 +0200
From: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>
Cc: linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 2/2] arm64: dts: exynos8895: Add syscon-poweroff and syscon-reboot nodes

For Exynos8895, a reboot is handled by setting the bit(SWRESET_SYSTEM[1])
of SWRESET register(PMU + 0x400) and power-off is handled by setting
bit(DATA[8]) of PS_HOLD_CONTROL register (PMU + 0x330c).

Tested using "reboot" and "poweroff -p" commands.

Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
---
 arch/arm64/boot/dts/exynos/exynos8895.dtsi | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/exynos/exynos8895.dtsi b/arch/arm64/boot/dts/exynos/exynos8895.dtsi
index 90b318b2f..9eb89dd19 100644
--- a/arch/arm64/boot/dts/exynos/exynos8895.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos8895.dtsi
@@ -388,6 +388,21 @@ pmu_system_controller: system-controller@...80000 {
 			compatible = "samsung,exynos8895-pmu",
 				     "samsung,exynos7-pmu", "syscon";
 			reg = <0x16480000 0x10000>;
+
+			poweroff: syscon-poweroff {
+				compatible = "syscon-poweroff";
+				regmap = <&pmu_system_controller>;
+				offset = <0x330c>; /* PS_HOLD_CONTROL */
+				mask = <0x100>; /* reset value */
+			};
+
+			reboot: syscon-reboot {
+				compatible = "syscon-reboot";
+				regmap = <&pmu_system_controller>;
+				offset = <0x400>; /* SWRESET */
+				mask = <0x1>; /* SWRESET_SYSTEM */
+				value = <0x1>; /* reset value */
+			};
 		};
 
 		pinctrl_alive: pinctrl@...b0000 {
-- 
2.43.0