[PATCH 0/4] spi: cadence-quadspi: Add Xilinx Versal OSPI support

[Sai Krishna Potthuri]

Add Octal SPI(OSPI) controller support for Xilinx Versal SoC.
Update the binding to add Xilinx Versal compatible string, also add
'power-domains' property and made as required for Xilinx Versal SoCs.
Add API in xilinx firmware for configuring OSPI Mux, which is
required to change the interface to OSPI. Xilinx Versal SoC
has external DMA support, so by using the OSPI MUX selection, interface
to the OSPI will be selected (either DMA interface or AXI slave interface).
Xilinx Versal OSPI external DMA:
Xilinx Versal OSPI DMA module is integrated to the Cadence OSPI Controller
with the DMA write channel. Cadence OSPI Controller which reads the data
from the Flash and stores in its internal SRAM and Xilinx Versal OSPI DMA
which reads the data from the SRAM in the Cadence OSPI Controller using
the DMA SRC channel and then the DMA DST channel initiates a write DMA
transfer into the destined address location.

Sai Krishna Potthuri (4):
  firmware: xilinx: Add OSPI Mux selection support
  dt-bindings: spi: cadence-quadspi: Add support for Xilinx Versal OSPI
  spi: cadence-quadspi: Add OSPI support for Xilinx Versal SoC
  spi: cadence-quadspi: Add Xilinx Versal external DMA support

 .../bindings/spi/cdns,qspi-nor.yaml           |  12 +
 drivers/firmware/xilinx/zynqmp.c              |  17 ++
 drivers/spi/spi-cadence-quadspi.c             | 214 ++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h          |  12 +
 4 files changed, 255 insertions(+)

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2.17.1