[RFC PATCH 2/2] regmap: Reject fast_io regmap configurations with RBTREE and MAPLE caches

[Mark Brown]

On Fri, Jul 21, 2023 at 04:53:42PM +0200, Marek Szyprowski wrote:

> This patch, which landed in today's linux-next, breaks operation of the 
> RockChip's VOP2 DRM driver 
> (drivers/gpu/drm/rockchip/rockchip_drm_vop2.c). I'm not sure what is the 
> proper fix in this case. Should one change the cache type to REGCACHE_FLAT?

Actually Guenter and Dan have made the required updates to support this
so the warning will be gone soon (hopefully Dan will send his patch
properly shortly).
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