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    ARM: dts: exynos: Always enable necessary APIO_1V8 and ABB_1V8 regulators on Arndale Octa · 7905b233
    Krzysztof Kozlowski 提交于
    [ 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: NKrzysztof Kozlowski <krzk@kernel.org>
    Signed-off-by: NSasha Levin <sashal@kernel.org>
    7905b233
exynos5420-arndale-octa.dts 9.1 KB