linux-kernel - [PATCH AUTOSEL 4.9 42/60] ARM: dts: exynos: Mark LDO10 as always-on on Peach Pit/Pi Chromebooks

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Message-Id: <20190922185934.4305-42-sashal@kernel.org>
Date:   Sun, 22 Sep 2019 14:59:15 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Sasha Levin <sashal@...nel.org>, devicetree@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 42/60] ARM: dts: exynos: Mark LDO10 as always-on on Peach Pit/Pi Chromebooks

From: Marek Szyprowski <m.szyprowski@...sung.com>

[ Upstream commit 5b0eeeaa37615df37a9a30929b73e9defe61ca84 ]

Commit aff138bf8e37 ("ARM: dts: exynos: Add TMU nodes regulator supply
for Peach boards") assigned LDO10 to Exynos Thermal Measurement Unit,
but it turned out that it supplies also some other critical parts and
board freezes/crashes when it is turned off.

The mentioned commit made Exynos TMU a consumer of that regulator and in
typical case Exynos TMU driver keeps it enabled from early boot. However
there are such configurations (example is multi_v7_defconfig), in which
some of the regulators are compiled as modules and are not available
from early boot. In such case it may happen that LDO10 is turned off by
regulator core, because it has no consumers yet (in this case consumer
drivers cannot get it, because the supply regulators for it are not yet
available). This in turn causes the board to crash. This patch restores
'always-on' property for the LDO10 regulator.

Fixes: aff138bf8e37 ("ARM: dts: exynos: Add TMU nodes regulator supply for Peach boards")
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/boot/dts/exynos5420-peach-pit.dts | 1 +
 arch/arm/boot/dts/exynos5800-peach-pi.dts  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts
index ec4a00f1ce01e..8b754ae8c8f7d 100644
--- a/arch/arm/boot/dts/exynos5420-peach-pit.dts
+++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts
@@ -427,6 +427,7 @@
 				regulator-name = "vdd_ldo10";
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <1800000>;
+				regulator-always-on;
 				regulator-state-mem {
 					regulator-off-in-suspend;
 				};
diff --git a/arch/arm/boot/dts/exynos5800-peach-pi.dts b/arch/arm/boot/dts/exynos5800-peach-pi.dts
index 01f466816fea7..1f90df2d7ecd8 100644
--- a/arch/arm/boot/dts/exynos5800-peach-pi.dts
+++ b/arch/arm/boot/dts/exynos5800-peach-pi.dts
@@ -427,6 +427,7 @@
 				regulator-name = "vdd_ldo10";
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <1800000>;
+				regulator-always-on;
 				regulator-state-mem {
 					regulator-off-in-suspend;
 				};
-- 
2.20.1