• Krzysztof Kozlowski's avatar
    ARM: dts: exynos: Always enable necessary APIO_1V8 and ABB_1V8 regulators on Arndale Octa · 5ab99cf7
    Krzysztof Kozlowski authored
    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: default avatarKrzysztof Kozlowski <krzk@kernel.org>
    5ab99cf7
exynos5420-arndale-octa.dts 15.9 KB