[PATCH v2 0/3] drivers/spi/airoha_snfi_spi: dual/quad wires modes, dma

[Mikhail Kshevetskiy]

This patch series adds
 * Support of 2-wire and 4-wire spi modes. It speeds up flash read/write
   by 2 (or 4) times on the corresponding hardware.
 * Support of DMA for spi-nand cache reading/writing/updating. It speeds
   up flash read/write very much.

Only 2-wire mode has been tested so far. It works fine with en7523/an7581
chips.

UBI attaching
-------------
before: 17 sec
after:  2.5 sec

reading of 0x1000000 bytes
--------------------------
before: 17 sec
after: 2 sec

Changes v2:
 * dma support was added

Mikhail Kshevetskiy (3):
  drivers/spi/airoha_snfi_spi: remove unnecessary operation
    adjust_op_size
  drivers/spi/airoha_snfi_spi: add support of dual/quad wires spi modes
  drivers/spi/airoha_snfi_spi: add dma support

 drivers/spi/airoha_snfi_spi.c | 634 ++++++++++++++++++++++++++++++++--
 1 file changed, 596 insertions(+), 38 deletions(-)

-- 
2.47.2