From: Alim Akhtar <alim.akhtar@samsung.com>
Date: Sun, 5 Jul 2020 07:09:17 +0000 (+0530)
Subject: arm64: dts: exynos: Fix silent hang after boot on Espresso
X-Git-Tag: v4.14.194~174
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=ed03eb0021b73fc7f4067da3cb71d625bbd75967;p=users%2Fdwmw2%2Flinux.git

arm64: dts: exynos: Fix silent hang after boot on Espresso

[ Upstream commit b072714bfc0e42c984b8fd6e069f3ca17de8137a ]

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@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
index 4a8b1fb51243c..c8824b918693d 100644
--- a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
+++ b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
@@ -155,6 +155,7 @@
 				regulator-min-microvolt = <700000>;
 				regulator-max-microvolt = <1150000>;
 				regulator-enable-ramp-delay = <125>;
+				regulator-always-on;
 			};
 
 			ldo8_reg: LDO8 {