• Mark Brown's avatar
    ARM: 7366/3: amba: Remove AMBA level regulator support · 1e45860f
    Mark Brown authored
    The AMBA bus regulator support is being used to model on/off switches
    for power domains which isn't terribly idiomatic for modern kernels with
    the generic power domain code and creates integration problems on platforms
    which don't use regulators for their power domains as it's hard to tell
    the difference between a regulator that is needed but failed to be provided
    and one that isn't supposed to be there (though DT does make that easier).
    
    Platforms that wish to use the regulator API to manage their power domains
    can indirect via the power domain interface.
    
    This feature is only used with the vape supply of the db8500 PRCMU
    driver which supplies the UARTs and MMC controllers, none of which have
    support for managing vcore at runtime in mainline (only pl022 SPI
    controller does).  Update that supply to have an always_on constraint
    until the power domain support for the system is updated so that it is
    enabled for these users, this is likely to have no impact on practical
    systems as probably at least one of these devices will be active and
    cause AMBA to hold the supply on anyway.
    Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
    Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
    Tested-by: default avatarShawn Guo <shawn.guo@linaro.org>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    1e45860f
bus.c 15.3 KB