ARM: dts: exynos: Mark LDO10 as always-on on Peach Pit/Pi Chromebooks

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

diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts
index ec4a00f1ce01e7a607844dcfb38a951e4d49eec4..8b754ae8c8f7d11a03189f198edcb732fa785340 100644 (file)
--- 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 01f466816fea714f1056c041965205dead9db615..1f90df2d7ecd8f9e4cc8fd71b35b41dd67fd848f 100644 (file)
--- 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;
                                };