drm/panel: s6e63m0: Implement 28 backlight levels
A later version of the s6e63m0 driver in the Samsung GT-I9070 vendor tree provides 28 different backlight levels making use of elaborate control of the ACL and ELVSS regulator. Implement this more fine-grained backlight control. Signed-off-by:Linus Walleij <linus.walleij@linaro.org> Reviewed-by:
Guido Günther <agx@sigxcpu.org> Cc: Stephan Gerhold <stephan@gerhold.net> Cc: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201117175621.870085-2-linus.walleij@linaro.org
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