Merge tag 'sunxi-rework-mbus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git...

Allwinner MBUS and DMA-ops rework

The Allwinner SoCs have a number of high-bandwidth devices connected to
a memory bus with a different RAM mapping than the CPU.

This was addressed before through drivers setting the DMA offsets
directly, and subsequently changed to calls to dma_direct_set_offset.
However that wasn't really meant to be exported to modules (and thus
drivers). The duplicated code also led to small inconsistencies across
drivers in how we dealt with DT backward compatibility.

Move all that DMA setup code into a platform bus notifier to share that
code and remove the export on dma_direct_set_offset.

* tag 'sunxi-rework-mbus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/mripard/linux:
  dma-mapping: remove the dma_direct_set_offset export
  media: sun8i-di: Remove the call to of_dma_configure
  media: cedrus: Remove the MBUS quirks
  media: sun6i: Remove the MBUS quirks
  media: sun4i: Remove the MBUS quirks
  drm/sun4i: backend: Remove the MBUS quirks
  soc: sunxi: Deal with the MBUS DMA offsets in a central place
  drm/sun4i: backend: Fix probe failure with multiple backends

Signed-off-by: Arnd Bergmann <arnd@arndb.de>