ARM: dts: exynos: Always enable necessary APIO_1V8 and ABB_1V8 regulators on Arndale...

[ Upstream commit 5ab99cf7d5e96e3b727c30e7a8524c976bd3723d ]

The PVDD_APIO_1V8 (LDO2) and PVDD_ABB_1V8 (LDO8) regulators were turned
off by Linux kernel as unused.  However they supply critical parts of
SoC so they should be always on:

1. PVDD_APIO_1V8 supplies SYS pins (gpx[0-3], PSHOLD), HDMI level shift,
   RTC, VDD1_12 (DRAM internal 1.8 V logic), pull-up for PMIC interrupt
   lines, TTL/UARTR level shift, reset pins and SW-TACT1 button.
   It also supplies unused blocks like VDDQ_SRAM (for SROM controller) and
   VDDQ_GPIO (gpm7, gpy7).
   The LDO2 cannot be turned off (S2MPS11 keeps it on anyway) so
   marking it "always-on" only reflects its real status.

2. PVDD_ABB_1V8 supplies Adaptive Body Bias Generator for ARM cores,
   memory and Mali (G3D).

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

diff --git a/arch/arm/boot/dts/exynos5420-arndale-octa.dts b/arch/arm/boot/dts/exynos5420-arndale-octa.dts
index 9cc83c5..e664c33 100644 (file)
--- a/arch/arm/boot/dts/exynos5420-arndale-octa.dts
+++ b/arch/arm/boot/dts/exynos5420-arndale-octa.dts
@@ -110,6 +110,7 @@
                                regulator-name = "PVDD_APIO_1V8";
                                regulator-min-microvolt = <1800000>;
                                regulator-max-microvolt = <1800000>;
+                               regulator-always-on;
                        };
 
                        ldo3_reg: LDO3 {
@@ -148,6 +149,7 @@
                                regulator-name = "PVDD_ABB_1V8";
                                regulator-min-microvolt = <1800000>;
                                regulator-max-microvolt = <1800000>;
+                               regulator-always-on;
                        };
 
                        ldo9_reg: LDO9 {