Hi Nobuhiro, Pavel,

This patch series adds SPI driver for the Renesas RPC-IF.
Alongside relevant changes for spi-mem have been also
backported. This enables accessing SPI flash chip connected
to RPC-IF on RZ/G2x boards.

We currently only aim to backport just the driver hence there
are no changes to dts/i files. The driver has been tested on
RZ/G2{EM} with all the required dts/i changes [1].

Currently we are upstreaming clock [2] and pinctrl [3] changes
required for RPC-IF interface on RZ/G2x SoC's once that hits
v5.11 we shall backport it.

All the patches have been cherry picked from Linux 5.10-rc5.

[1] https://github.com/prabhakarlad/cip/commits/master
[2] https://patchwork.kernel.org/project/linux-renesas-soc/
    list/?series=365697&archive=both&state=*
[3] https://patchwork.kernel.org/project/linux-renesas-soc/
    list/?series=387535&archive=both&state=*

Changes for v2:
* Patches {1, 3, 4}/7 unchanged
* Patch 2/7
   * Fixed reference leak for OF node in rpcif_probe()
   * Fixed overwriting return value in error path of rpcif_manual_xfer()
   * Replaced C++ style comment with C style
   * Replaced tab with a space between struct and struct name
   * Fixed a typo in commit message (s/absract/abstract)
* Patch 5/7
   * Fixed reference leak in spi_mem_access_start for PM
* Patch 6/7
   * Return early in spi_mem_dirmap_dirmap_{read/write}
* Patch 7/7
   * Replaced C++ style comment with C style
   * Used __maybe_unused for rpcif_spi_{suspend,resume} and dropped
     CONFIG_PM_SLEEP ifdef checks
   * Elaborated the description for SPI_RPCIF config
   * Dropped the label err_put_ctlr from rpc_spi_probe()

Cheers,
Prabhakar

Boris Brezillon (3):
  spi: spi-mem: Add SPI_MEM_NO_DATA to the spi_mem_data_dir enum
  spi: spi-mem: Split spi_mem_exec_op() code
  spi: spi-mem: Add a new API to support direct mapping

Naga Sureshkumar Relli (1):
  spi: spi-mem: export spi_mem_default_supports_op()

Sergei Shtylyov (3):
  dt-bindings: memory: document Renesas RPC-IF bindings
  memory: add Renesas RPC-IF driver
  spi: add Renesas RPC-IF driver

 .../memory-controllers/renesas,rpc-if.yaml    |  88 +++
 drivers/memory/Kconfig                        |   9 +
 drivers/memory/Makefile                       |   1 +
 drivers/memory/renesas-rpc-if.c               | 606 ++++++++++++++++++
 drivers/spi/Kconfig                           |   8 +
 drivers/spi/Makefile                          |   1 +
 drivers/spi/spi-mem.c                         | 274 +++++++-
 drivers/spi/spi-rpc-if.c                      | 208 ++++++
 include/linux/spi/spi-mem.h                   |  93 +++
 include/memory/renesas-rpc-if.h               |  87 +++
 10 files changed, 1351 insertions(+), 24 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/renesas,rpc-if.yaml
 create mode 100644 drivers/memory/renesas-rpc-if.c
 create mode 100644 drivers/spi/spi-rpc-if.c
 create mode 100644 include/memory/renesas-rpc-if.h

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2.25.1