drm/sun4i: Add alpha property for sun8i UI layer
DE2.0 and DE3.0 UI layers supports plane-global alpha channel. Add alpha property to the DRM plane and connect it to the corresponding registers in mixer. Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com> Reviewed-by: Jernej Skrabec <jernej.skrabec@siol.net> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20210128113940.347013-2-r.stratiienko@gmail.com
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