[PATCH v4 00/13] spi: atmel-quadspi: introduce sam9x60 qspi controller

[Tudor.Ambarus]

From: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>

Patches from 1 to 11 are minor fixes or cosmetics.
Patches 12 and 13 introduce the sam9x60 qspi controller.

sam9x60 qspi controller tested with sst26vf064b jedec,spi-nor flash.
Backward compatibility test done on sama5d2 qspi controller and
mx25l25635e jedec,spi-nor flash.

The patches are generated on top of for-next branch.

v4:
- s/smm/mr, init controller in serial memory mode by default
- drop local variables that kept aq->regs and &pdev->dev, the compiler
  should be smart enough to store them in a register
- introduce QSPI_IFR_TFRTYP_MEM
- add comment saying QSPI_IFR_APBTFRTYP_READ is defined in sam9x60
- s/sama5d2_qspi_modes/atmel_qspi_modes, modes are the same both
  controllers
- fix kernel doc header
- move comment in function body
- collect R-b tags

v3:
- update smm value when different.
- treat just regular spi transfers when introducing sam9x60 qspi IP.
  Mem transfers will be added together with dirmap support.
- reorganize the code and change ops functions pointers to avoid code
  duplication.
- rename aq->clk to aq->pclk to indicate that it's a peripheral clock.
- drop unused and NOP transfer macros.
- add Suggested-by tags, reword some commits.

v2:
- cache MR value,
- drop iomem wrappers,
- make "pclk" clock-name mandatory even for sama5d2,
- rework clock handling,
- reorder setting of register values in set_cfg() calls,
- collect R-b tags.

Tudor Ambarus (13):
  spi: atmel-quadspi: cache MR value to avoid a write access
  spi: atmel-quadspi: order header files inclusion alphabetically
  spi: atmel-quadspi: drop wrappers for iomem accesses
  spi: atmel-quadspi: fix naming scheme
  spi: atmel-quadspi: remove unnecessary cast
  spi: atmel-quadspi: return appropriate error code
  spi: atmel-quadspi: switch to SPDX license identifiers
  spi: atmel-quadspi: rework transfer macros
  dt-bindings: spi: atmel-quadspi: update example to new clock binding
  dt-bindings: spi: atmel-quadspi: make "pclk" mandatory
  spi: atmel-quadspi: add support for named peripheral clock
  dt-bindings: spi: atmel-quadspi: QuadSPI driver for Microchip SAM9X60
  spi: atmel-quadspi: add support for sam9x60 qspi controller

 .../devicetree/bindings/spi/atmel-quadspi.txt      |  12 +-
 drivers/spi/atmel-quadspi.c                        | 389 +++++++++++++++------
 2 files changed, 284 insertions(+), 117 deletions(-)

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2.9.5