linux-kernel - [PATCH 1/3] arm64: dts: exynos: gs101: add syscon-poweroff and syscon-reboot nodes

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Message-ID: <20240626194300.302327-2-peter.griffin@linaro.org>
Date: Wed, 26 Jun 2024 20:42:58 +0100
From: Peter Griffin <peter.griffin@...aro.org>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	alim.akhtar@...sung.com,
	s.nawrocki@...sung.com,
	cw00.choi@...sung.com,
	mturquette@...libre.com,
	sboyd@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	tudor.ambarus@...aro.org,
	andre.draszik@...aro.org,
	kernel-team@...roid.com,
	willmcvicker@...gle.com,
	devicetree@...r.kernel.org,
	linux-clk@...r.kernel.org,
	Peter Griffin <peter.griffin@...aro.org>
Subject: [PATCH 1/3] arm64: dts: exynos: gs101: add syscon-poweroff and syscon-reboot nodes

Reboot of gs101 SoC can be handled by setting the
bit(SWRESET_SYSTEM[1]) of SYSTEM_CONFIGURATION register(PMU + 0x3a00).

Poweroff of gs101 SoC can be handled by setting bit(DATA[8]) of
PAD_CTRL_PWR_HOLD register (PMU + 0x3e9c).

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

Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
---
This feature has a runtime dependency on the following series
https://lore.kernel.org/linux-arm-kernel/20240621115544.1655458-1-peter.griffin@linaro.org/
and also the exynos-pmu and clk-gs101 patches in this series to be functional.
---
 arch/arm64/boot/dts/exynos/google/gs101.dtsi | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/exynos/google/gs101.dtsi b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
index a66e996666b8..ce24b80985a2 100644
--- a/arch/arm64/boot/dts/exynos/google/gs101.dtsi
+++ b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
@@ -1394,6 +1394,21 @@ sysreg_apm: syscon@...204e0 {
 		pmu_system_controller: system-controller@...60000 {
 			compatible = "google,gs101-pmu", "syscon";
 			reg = <0x17460000 0x10000>;
+
+			poweroff: syscon-poweroff {
+				compatible = "syscon-poweroff";
+				regmap = <&pmu_system_controller>;
+				offset = <0x3e9c>; /* PAD_CTRL_PWR_HOLD */
+				mask = <0x100>; /* reset value */
+			};
+
+			reboot: syscon-reboot {
+				compatible = "syscon-reboot";
+				regmap = <&pmu_system_controller>;
+				offset = <0x3a00>; /* SYSTEM_CONFIGURATION */
+				mask = <0x2>; /* SWRESET_SYSTEM */
+				value = <0x2>; /* reset value */
+			};
 		};
 
 		pinctrl_gpio_alive: pinctrl@...d0000 {
-- 
2.45.2.741.gdbec12cfda-goog