Bring back dmaengine API support for scatter-gather memcpy's.

Changes in patch v2:
  * Expanded API function documentation to elaborate on its semantics,
    limitations and corner case behaviour.
  * Broke the patch series into three different ones: documentation, core
    API change and consumer driver

v1 - https://lore.kernel.org/dmaengine/20210706234338.7696-1-adrian.martinezlarumbe@imgtec.com (local)

Adrian Larumbe (3):
  dmaengine: Add documentation for new memcpy scatter-gather function
  dmaengine: Add core function and capability check for DMA_MEMCPY_SG
  dmaengine: Add consumer for the new DMA_MEMCPY_SG API function.

 .../driver-api/dmaengine/provider.rst         |  23 ++++
 drivers/dma/dmaengine.c                       |   7 +
 drivers/dma/xilinx/xilinx_dma.c               | 122 ++++++++++++++++++
 include/linux/dmaengine.h                     |  20 +++
 4 files changed, 172 insertions(+)


base-commit: e0674853943287669a82d1ffe09a700944615978
-- 
2.33.1


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