linux-kernel - [PATCH 1/2] arm64: dts: exynos: Fix silent hang after boot

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Date:   Sun,  5 Jul 2020 12:27:46 +0530
From:   Alim Akhtar <alim.akhtar@...sung.com>
To:     rzk@...nel.org
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org, Alim Akhtar <alim.akhtar@...sung.com>
Subject: [PATCH 1/2] arm64: dts: exynos: Fix silent hang after boot

Once regulators are disabled after kernel boot, on espresso
board silent hang observed because of LDO7 being disabled.
LDO7 actually provide power to CPU cores and non-cpu blocks
circuitries.
Keep this regulator always-on to fix this hang.

Fixes: 9589f7721e16 ("arm64: dts: Add S2MPS15 PMIC node on exynos7-espresso")
Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
---
 arch/arm64/boot/dts/exynos/exynos7-espresso.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
index 790f12ca8981..bb86950032d3 100644
--- a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
+++ b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
@@ -157,6 +157,7 @@
 				regulator-min-microvolt = <700000>;
 				regulator-max-microvolt = <1150000>;
 				regulator-enable-ramp-delay = <125>;
+				regulator-always-on;
 			};
 
 			ldo8_reg: LDO8 {

base-commit: 9e50b94b3eb0d859a2586b5a40d7fd6e5afd9210
-- 
2.17.1