On 12/11/2017 06:57 AM, Prabhakar Kushwaha wrote:
SPI-NOR framework currently supports-
- (1-1-1, 1-1-2, 1-1-4) read protocols
- read latency(dummy bytes) are hardcoded with the assumption
that the flash would support it.
- No support of mode bits.
- No support of flash size above 128Mib
This patch set add support of 1-2-2, 1-4-4 read protocols. It ports Linux commits "mtd: spi-nor: add a stateless method to support memory size above 128Mib" and "mtd: spi-nor: parse Serial Flash Discoverable Parameters (SFDP) tables". It enables 4byte address opcode and run time flash parameters discovery including dummy cycle and mode cycle.
Finally it update fsl-quadspi driver to store(set_mode) spi bus mode and provision for run-time LUTs creation.
Note: This patch-set is only **compliation** tested. Sending RFC to get early feed-back on the approach.
Prabhakar Kushwaha (5): sf: Add support of 1-2-2, 1-4-4 IO READ protocols sf: add method to support memory size above 128Mib sf: parse Serial Flash Discoverable Parameters (SFDP) tables sf: fsl_qspi: Add support of fsl_qspi_set_mode sf: fsl_quadspi: Configue LUT based on padding information
drivers/mtd/spi/sf_internal.h | 230 +++++++++++++++- drivers/mtd/spi/spi_flash.c | 574 +++++++++++++++++++++++++++++++++++++++- drivers/spi/fsl_qspi.c | 85 +++++- include/spi_flash.h | 2 + 5 files changed, 875 insertions(+), 18 deletions(-)
Could you rather port the entire SPI NOR framework from Linux 4.14 ? That'd make more sense than porting bits and pieces on top of the current crappy code IMO.