[PATCH v2 00/14] spi: dw: Add support for DUAL/QUAD/OCTAL modes

[Sean Anderson]

This series adds support for enhanced SPI modes. It was tested on a K210 (DWC
SSI with QSPI flash).

If anyone has a designware device with QSPI flash attached (especially a DW SSI
APB device), I'd greatly appreciate them testing out this patch series.

Many of the earlier patches in this series are general fixups and can be split
off/merged separately if desired.

Changes in v2:
- Add more information to exec_op debug message
- Actually mask interrupts
- Merge CAP_{DUAL,QUAD,OCTAL} into CAP_ENHANCED
- Fix some inconsistencies in register naming and usage
- Moved some hunks between commits so things make more sense

Sean Anderson (14):
  cmd: sf: Display errno on erase failure
  cmd: sf: Print error on test failure
  mtd: spi-nor-core: Fix typo in documentation
  mtd: spi-mem: Export spi_mem_default_supports_op
  spi: spi-mem: Add debug message for spi-mem ops
  spi: dw: Log status register on timeout
  spi: dw: Actually mask interrupts
  spi: dw: Switch to capabilities
  spi: dw: Rewrite poll_transfer logic
  spi: dw: Add ENHANCED cap
  spi: dw: Define registers for enhanced mode
  spi: dw: Support enhanced SPI
  spi: dw: Support clock stretching
  riscv: k210: Enable QSPI for spi3

 arch/riscv/dts/k210-maix-bit.dts |   2 +
 cmd/sf.c                         |  29 +-
 drivers/spi/designware_spi.c     | 647 +++++++++++++++++++++----------
 drivers/spi/spi-mem.c            |   7 +
 include/linux/mtd/spi-nor.h      |   2 +-
 include/spi-mem.h                |   3 +
 6 files changed, 472 insertions(+), 218 deletions(-)

-- 
2.29.2