• Mark Brown's avatar
    backlight: Add WM831x backlight driver · a4f3d55c
    Mark Brown authored
    The WM831x series of PMICs provide DC-DC boost convertors and current
    sinks which can be used together to drive LEDs for use as backlights.
    Expose this functionality via the backlight API.
    
    Since when used in this configuration the current sink and boost
    convertor are very tightly coupled with a multi-stage startup for
    the current sink which overlaps with the boost convertor startup
    this driver bypasses the regulator API. Machine inititialisation
    is responsible for ensuring that the regulators are not accessed
    via both APIs.
    Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
    Signed-off-by: default avatarRichard Purdie <rpurdie@linux.intel.com>
    a4f3d55c
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