drm/vc4: hdmi: Implement a register layout abstraction
The HDMI controllers found in the BCM2711 have most of the registers reorganized in multiple registers areas and at different offsets than previously found. The logic however remains pretty much the same, so it doesn't really make sense to create a whole new driver and we should share the code as much as possible. Let's implement some indirection to wrap around a register and depending on the variant will lookup the associated register on that particular variant. Signed-off-by: Maxime Ripard <maxime@cerno.tech> Tested-by: Chanwoo Choi <cw00.choi@samsung.com> Tested-by: Hoegeun Kwon <hoegeun.kwon@samsung.com> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com> Link: https://patchwork.freedesktop.org/patch/msgid/3070236daff920e7edd11c5a72ac31fd0f6a656b.1599120059.git-series.maxime@cerno.tech
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