[PATCH v2 00/14] mtd: spinand: Add Octal DTR SPI (8D-8D-8D) mode support

[Apurva Nandan <a-nandan@xxxxxx>]

Hi,
This series proposes patches for adding the following functionality
in SPI NAND core:

- Octal DTR SPI (8D-8D-8D) mode support

- Winbond W35N01JW SPI NAND chip support

- Power-on-Reset instruction support

This series has been tested on TI J721e EVM with the Winbond W35N01JW
flash with following test utilities:

- nandtest
  Test log: https://textbin.net/raw/fhypoz63f9

- mtd_stresstest
  Test log: https://textbin.net/raw/0xqjmqntj7

- UBIFS LTP stress test (NAND_XL_STRESS_DD_RW_UBIFS).
  Test log: https://textbin.net/raw/pyokws7wku

Datasheet: https://www.winbond.com/export/sites/winbond/datasheet/W35N01JW_Datasheet_Brief.pdf

---
Changes in v2:

- Removed *_ALL_ARGS() macros from spi-mem.h, and redefined DTR macros.

- Renamed spinand_setup_op() to spinand_patch_op(). Reduced one
  conditional check from this function. Had to keep tweaking in hot-path
  to avoid complicated implementation "hacks".

- Changes in commit messages and added comments.

- Dropped "Reject 8D-8D-8D op_templates if octal_dtr_enale() is
  missing in manufacturer_op" patch.

- Reduced PoR reset delay.

- Splitted "mtd: spinand: Add support for Winbond W35N01JW SPI NAND
  flash" into 3 independent patches.

Apurva Nandan (14):
  spi: spi-mem: Add DTR templates for cmd, address, dummy and data phase
  mtd: spinand: Add enum spinand_proto to indicate current SPI IO mode
  mtd: spinand: Patch spi_mem_op for the SPI IO protocol using reg_proto
  mtd: spinand: Fix odd byte addr and data phase in read and write reg
    op for Octal DTR mode
  mtd: spinand: Add adjust_op() in manufacturer_ops to modify the ops
    for manufacturer specific changes
  mtd: spinand: Add macros for Octal DTR page read and write operations
  mtd: spinand: Allow enabling Octal DTR mode in the core
  mtd: spinand: winbond: Add support for write volatile configuration
    register op
  mtd: spinand: winbond: Add octal_dtr_enable() for manufacturer_ops
  mtd: spinand: Add support for Power-on-Reset (PoR) instruction
  mtd: spinand: Perform Power-on-Reset on the flash in mtd_suspend()
  mtd: spinand: Add adjust_op() in Winbond manufacturer_ops
  mtd: spinand: winbond: Rename cache op_variants struct variable
  mtd: spinand: winbond: Add support for Winbond W35N01JW SPI NAND flash

 drivers/mtd/nand/spi/core.c    | 187 +++++++++++++++++++++++++++++-
 drivers/mtd/nand/spi/winbond.c | 200 +++++++++++++++++++++++++++++++--
 include/linux/mtd/spinand.h    |  67 +++++++++++
 include/linux/spi/spi-mem.h    |  41 +++++++
 4 files changed, 484 insertions(+), 11 deletions(-)

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2.25.1