linux-kernel - [PATCH] arm64: dts: exynos: Fix reboot/poweroff issues on Exynos7

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Date:   Wed, 28 Oct 2020 22:08:13 +0100
From:   Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
To:     kgene@...nel.org, krzk@...nel.org, alim.akhtar@...sung.com
Cc:     robh+dt@...nel.org, a.kesavan@...sung.com,
        naveenkrishna.ch@...il.com, thomas.ab@...sung.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
Subject: [PATCH] arm64: dts: exynos: Fix reboot/poweroff issues on Exynos7

In vendor sources for Exynos 7420, psci is not used to reboot or
poweroff device. Instead we should use syscon reboot/poweroff.
Previously it was not possible to poweroff (no syscon poweroff node) or
reboot (because it was handled by psci and this way is not working for
Exynos).

Fixes: fb026cb65247 ("arm64: dts: Add reboot node for exynos7")
Fixes: b9024cbc937d ("arm64: dts: Add initial device tree support for exynos7")
Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
---
 arch/arm64/boot/dts/exynos/exynos7.dtsi | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/exynos/exynos7.dtsi b/arch/arm64/boot/dts/exynos/exynos7.dtsi
index 959918f4ca45..47d54c369d03 100644
--- a/arch/arm64/boot/dts/exynos/exynos7.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos7.dtsi
@@ -117,8 +117,10 @@ cpu_atlas3: cpu@3 {
 	};
 
 	psci {
-		compatible = "arm,psci-0.2";
+		compatible = "arm,psci";
 		method = "smc";
+		cpu_off = <0x84000002>;
+		cpu_on = <0xC4000003>;
 	};
 
 	soc: soc@0 {
@@ -552,6 +554,13 @@ pmu_system_controller: system-controller@...c0000 {
 			compatible = "samsung,exynos7-pmu", "syscon";
 			reg = <0x105c0000 0x5000>;
 
+			poweroff: syscon-poweroff {
+				compatible = "syscon-poweroff";
+				regmap = <&pmu_system_controller>;
+				offset = <0x330C>; /* PS_HOLD_CONTROL */
+				mask = <0x5200>; /* reset value */
+			};
+
 			reboot: syscon-reboot {
 				compatible = "syscon-reboot";
 				regmap = <&pmu_system_controller>;
-- 
2.27.0