[PATCH v3 00/17] mtd: spinand: Add Octal DTR SPI (8D-8D-8D) mode support

[Apurva Nandan]

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

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

- ctrl_ops support

- Winbond W35N01JW SPI NAND chip support

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

- nandtest
  Test log: https://pastebin.com/raw/PusiLYVQ

- mtd_stresstest
  Test log: https://pastebin.com/raw/gBtV2CAf

- UBIFS LTP stress test (NAND_XL_STRESS_DD_RW_UBIFS).
  Test log: https://pastebin.com/raw/J8WyLsz1

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

---
Changes in v3:

- Added support for ctrl_ops, data_ops and ctrl_ops_variants.

- Made the implementation generic in terms of spinand protocol and SPI mode
  changes.

- Added option to disable Octal DTR mode.

- Removed spinand_patch_op(), adjust_op() manufacturer_op.

- Removed Power-on-Reset functionality and its call from mtd_suspend(), now 
  just disable Octal DTR at suspend.


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 (17):
  spi: spi-mem: Add DTR templates for cmd, address, dummy and data phase
  mtd: spinand: Define macros for Octal DTR ops
  mtd: spinand: Add enum spinand_protocol to indicate current SPI IO
    mode
  mtd: spinand: Rename 'op_templates' to 'data_ops'
  mtd: spinand: Define ctrl_ops for non-page read/write op templates
  mtd: spinand: Define default ctrl_ops in the core
  mtd: spinand: Switch from op macros usage to 'ctrl_ops' in the core
  mtd: spinand: Add support for manufacturer-based ctrl_ops variations
  mtd: spinand: Add change_mode() in manufacturer_ops
  mtd: spinand: Add pointer to probed flash's spinand_info
  mtd: spinand: Allow enabling/disabling Octal DTR mode in the core
  mtd: spinand: Add mtd_suspend() to disable Octal DTR mode at suspend
  mtd: spinand: winbond: Add support for write volatile configuration
    register op
  mtd: spinand: winbond: Add octal_dtr_enable/disable() in
    manufacturer_ops
  mtd: spianand: winbond: Add change_mode() 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    | 213 +++++++++++++++++++++++++----
 drivers/mtd/nand/spi/winbond.c | 242 +++++++++++++++++++++++++++++++--
 include/linux/mtd/spinand.h    | 154 +++++++++++++++++++--
 include/linux/spi/spi-mem.h    |  41 ++++++
 4 files changed, 599 insertions(+), 51 deletions(-)

-- 
2.25.1