[U-Boot] [RFC PATCH 0/6] SF: Migrate to Linux SPI NOR framework

[Vignesh R]

U-Boot SPI NOR support (sf layer) is quite outdated as it does not
support 4 byte addressing opcodes, SFDP table and different types of
quad mode enable sequences. Many newer flashes no longer support BANK
registers use by sf layer to a access >16MB space.
Also, many SPI controllers have special MMIO interfaces which provide
accelerated read/write access but require knowledge of flash parameters
to make use of it. Recent spi-mem layer provides a way to support such
flashes but sf layer isnt using that.
This patch series syncs SPI NOR framework from Linux v4.19. It also adds
spi-mem support on top.
So, we gain 4byte addressing support and SFDP support. This makes
migrating to U-Boot MTD framework very easy.

Tested with few Spansion, micron and macronix flashes with TI's dra7xx,
k2g, am43xx EVMs. I dont have access to flashes from other vendors. So,
I would greatly appreciate testing on other platforms.

This is a RFC, if this approach if fine with the community and get an
early feedback. Based on the response, I plan to post
official series with better splitting of patches, removing all dead code
and fixing up any checkpatch errors.

[1] https://github.com/r-vignesh/u-boot.git  branch: spi-nor-mig

Vignesh R (6):
  mtd: spi: Port SPI NOR framework from Linux
  mtd spi: Switch to new SPI NOR framework
  spi: spi-mem: Enable all SPI modes
  porter_defconfig: Enable tiny printf
  da8250_am18xxevm_defconfig: Enable TINY PRINTF
  mtd: spi: Remove unused files

 arch/sh/include/asm/bitops.h      |    4 +
 common/spl/Kconfig                |    7 +
 configs/da850_am18xxevm_defconfig |    1 +
 configs/porter_defconfig          |    1 +
 drivers/mtd/spi/Kconfig           |    8 +
 drivers/mtd/spi/Makefile          |    4 +-
 drivers/mtd/spi/sandbox.c         |   36 +-
 drivers/mtd/spi/sf_dataflash.c    |   11 +-
 drivers/mtd/spi/sf_internal.h     |  227 +--
 drivers/mtd/spi/sf_probe.c        |   33 +-
 drivers/mtd/spi/spi-nor.c         | 2859 +++++++++++++++++++++++++++++
 drivers/mtd/spi/spi_flash.c       | 1337 --------------
 drivers/mtd/spi/spi_flash_ids.c   |  211 ---
 drivers/spi/spi-mem.c             |   15 +-
 drivers/spi/stm32_qspi.c          |    4 +-
 include/linux/mtd/cfi.h           |  385 ++++
 include/linux/mtd/mtd.h           |    2 +-
 include/linux/mtd/spi-nor.h       |  421 +++++
 include/spi_flash.h               |  105 +-
 19 files changed, 3805 insertions(+), 1866 deletions(-)
 create mode 100644 drivers/mtd/spi/spi-nor.c
 delete mode 100644 drivers/mtd/spi/spi_flash.c
 delete mode 100644 drivers/mtd/spi/spi_flash_ids.c
 create mode 100644 include/linux/mtd/cfi.h
 create mode 100644 include/linux/mtd/spi-nor.h

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2.19.2