On Tue, May 26, 2020 at 03:12:39PM -0400, Jim Quinlan wrote:

v2:
Commit: "device core: Add ability to handle multiple dma offsets"
  o Added helper func attach_dma_pfn_offset_map() in address.c (Chistoph)
  o Helpers funcs added to __phys_to_dma() & __dma_to_phys() (Christoph)
  o Added warning when multiple offsets are needed and !DMA_PFN_OFFSET_MAP
  o dev->dma_pfn_map => dev->dma_pfn_offset_map
  o s/frm/from/ for dma_pfn_offset_frm_{phys,dma}_addr() (Christoph)
  o In device.h: s/const void */const struct dma_pfn_offset_region */
  o removed 'unlikely' from unlikely(dev->dma_pfn_offset_map) since
    guarded by CONFIG_DMA_PFN_OFFSET_MAP (Christoph)
  o Since dev->dma_pfn_offset is copied in usb/core/{usb,message}.c, now
    dev->dma_pfn_offset_map is copied as well.
  o Merged two of the DMA commits into one (Christoph).

Commit "arm: dma-mapping: Invoke dma offset func if needed":
  o Use helper functions instead of #if CONFIG_DMA_PFN_OFFSET

Other commits' changes:
  o Removed need for carrying of_id var in priv (Nicolas)
  o Commit message rewordings (Bjorn)
  o Commit log messages filled to 75 chars (Bjorn)
  o devm_reset_control_get_shared())
    => devm_reset_control_get_optional_shared (Philipp)
  o Add call to reset_control_assert() in PCIe remove routines (Philipp)

v1:
This patchset expands the usefulness of the Broadcom Settop Box PCIe
controller by building upon the PCIe driver used currently by the
Raspbery Pi.  Other forms of this patchset were submitted by me years
ago and not accepted; the major sticking point was the code required
for the DMA remapping needed for the PCIe driver to work [1].

There have been many changes to the DMA and OF subsystems since that
time, making a cleaner and less intrusive patchset possible.  This
patchset implements a generalization of "dev->dma_pfn_offset", except
that instead of a single scalar offset it provides for multiple
offsets via a function which depends upon the "dma-ranges" property of
the PCIe host controller.  This is required for proper functionality
of the BrcmSTB PCIe controller and possibly some other devices.

If you can enable the h/w support without the multiple offset support, 
then I'd split up this series. The latter part might take a bit more 
time.

Rob