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

[Simon Goldschmidt]

On 28.11.2018 18:26, Vignesh R wrote:
> U-Boot SPI NOR support (sf layer) is quite outdated as it does not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

Patch 1/6 seems to be missing for me and in patchwork...

Regards,
Simon

>    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
>