[PATCH 0/4] mtd: spi-nor: add generic flash driver

[tkuw584924 at gmail.com]

From: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>

The goal of series is to port spi-nor-generic feature based on SFDP
parsing. This feature will suppress the increase of spi_nor_ids{} size
and reduce our effort to maintain it.

We need to rework 4-byte address mode entry/exit functions and enhance
SFDP parsing to select proper 4-byte address mode method. After that, 
add spi-nor-generic structure and fallback logic in spi_nor_read_id().

Most of the code in this series are from Linux commits with some
modification to address gap between u-boot and Linux implementation.

It may be better to sync whole SPI NOR framework with Linux. That will be
done incrementally by separate series.

Tested with CYRS17B512 SPI NOR Flash which supports SFDP but not listed
in spi_nor_ids[].
https://www.infineon.com/dgdl/Infineon-CYRS17B512_512_MB_64_MB_SERIAL_NOR_FLASH_SPI_QSPI_3-DataSheet-v07_00-EN.pdf?fileId=8ac78c8c8fc2dd9c01900eee733d45f3

Takahiro Kuwano (4):
  mtd: spi-nor: Rework set_4byte()
  mtd: spi-nor: Set the 4-Byte Address Mode method based on SFDP data
  mtd: spi-nor: Remove SPI_NOR_SKIP_SFDP flag
  mtd: spi-nor: add generic flash driver

 drivers/mtd/spi/sf_internal.h  |  10 +-
 drivers/mtd/spi/spi-nor-core.c | 317 +++++++++++++++++++++++++--------
 include/linux/mtd/spi-nor.h    |   3 +
 3 files changed, 252 insertions(+), 78 deletions(-)

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2.34.1