Changes since v3: - use platform device to probe clock driver - add Acked-by CK Hu for the probe deferred patch
Changes since v2: - fix kconfig typo (shame on me) - delete __initconst from mm_clocks as converted to a platform driver
Changes since v1: - add binding documentation - ddp: use regmap_update_bits - ddp: ignore EPROBE_DEFER on clock probing - mfd: delete mmsys_private - add Reviewed-by and Acked-by tags
MMSYS in Mediatek SoCs has some registers to control clock gates (which is used in the clk driver) and some registers to set the routing and enable the differnet blocks of the display subsystem.
Up to now both drivers, clock and drm are probed with the same device tree compatible. But only the first driver get probed, which in effect breaks graphics on mt8173 and mt2701.
This patch uses a platform device registration in the DRM driver, which will trigger the probe of the corresponding clock driver. It was tested on the bananapi-r2 and the Acer R13 Chromebook.