[PATCH v3 SPI for-next 0/3] DMA Support for SPI in PCI1xxxx

[Thangaraj Samynathan <thangaraj.s@xxxxxxxxxxxxx>]

This series of patch is to add DMA Support that improves SPI Performance
in PCI1xxxx. With DMA Support in 20MHz clock, the performance is
improved from 6Mbps to 17Mbps.

v3:
-Merged Tx and Rx DMA patches into one to avoid unidirectional dma.
-Changed naming from DMA read and write functions to from_io and to_io
to avoid confusion between DMA and SPI Controller operations.

v2:
-Added can_dma operation, so that the core can do all DMA mapping and
switch between, DMA and PIO operation by itself.
-Added error messages for syslock acquire failure and DMA init failures.

v1:
-Initial Submission

Thangaraj Samynathan (2):
  spi: mchp-pci1xxxx: Add support for DMA in SPI
  spi: mchp-pci1xxxx: DMA support for copying data to and from  SPI Buf

 drivers/spi/spi-pci1xxxx.c | 510 +++++++++++++++++++++++++++++++++++--
 1 file changed, 483 insertions(+), 27 deletions(-)

-- 
2.25.1