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    Subject[PATCH 4.9 052/117] ARM: dts: exynos: Always enable necessary APIO_1V8 and ABB_1V8 regulators on Arndale Octa
    Date
    [ 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>
    ---
    arch/arm/boot/dts/exynos5420-arndale-octa.dts | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/arch/arm/boot/dts/exynos5420-arndale-octa.dts b/arch/arm/boot/dts/exynos5420-arndale-octa.dts
    index 9cc83c51c925..e664c33c3c64 100644
    --- 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 {
    --
    2.20.1


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