[PATCH v2 00/10] 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. Given
that there has been no testing of v2 over the past month, I don't think lack of
testing should hold up this series.

Changes in v3:
- Dropped merged patches
- Rebased on u-boot/master

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 (10):
  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

 drivers/spi/designware_spi.c | 647 ++++++++++++++++++++++++-----------
 drivers/spi/spi-mem.c        |   7 +
 include/spi-mem.h            |   3 +
 3 files changed, 451 insertions(+), 206 deletions(-)

-- 
2.31.0