[U-Boot] [PATCH v6 00/76] mtd: Add SPI-NOR core support

[Jagan Teki]

Hi Stefan/Siva/Mugunthan/Vikas/Others

On 15 February 2016 at 02:16, Jagan Teki <jteki at openedev.com> wrote:
> Compared to previous patch series this series adds spi-nor
> core with spi-nor controller drivers are of "mtd uclass"
>
> This is whole series for all spi-nor related changes, and while
> series tested on spansion spi-nor chip.
>
> Know issue:
> - arch/x86/lib/mrccache.c uses dm_spi_flash_ops, this need to fix.
>
> Why this framework:
>
> Some of the SPI device drivers at drivers/spi not a real
> spi controllers, Unlike normal/generic SPI controllers they
> operates only with SPI-NOR flash devices. these were technically
> termed as SPI-NOR controllers, Ex: drivers/spi/fsl_qspi.c
>
> The problem with these were resides at drivers/spi is entire
> SPI layer becomes SPI-NOR flash oriented which is absolutely
> a wrong indication where SPI layer getting effected more with
> flash operations - So this SPI-NOR core will resolve this issue
> by separating all SPI-NOR flash operations from spi layer and
> creats a generic layer called SPI-NOR core which can be used to
> interact SPI-NOR to SPI driver interface layer and the SPI-NOR
> controller driver. The idea is taken from Linux spi-nor framework.
>
> Before SPI-NOR:
>
> -----------------------
>         cmd/sf.c
> -----------------------
>         spi_flash.c
> -----------------------
>         sf_probe.c
> -----------------------
>         spi-uclass
> -----------------------
>         spi drivers
> -----------------------
>         SPI NOR chip
> -----------------------
>
> After SPI-NOR:
>
> ------------------------------
>         cmd/sf.c
> ------------------------------
>         spi-nor.c
> -------------------------------
> m25p80.c        spi nor drivers
> -------------------------------
> spi-uclass      SPI NOR chip
> -------------------------------
> spi drivers
> -------------------------------
> SPI NOR chip
> -------------------------------
>
> SPI-NOR with MTD:
>
> ------------------------------
>         cmd/sf.c
> ------------------------------
>         MTD core
> ------------------------------
>         spi-nor.c
> -------------------------------
> m25p80.c        spi nor drivers
> -------------------------------
> spi-uclass      SPI NOR chip
> -------------------------------
> spi drivers
> -------------------------------
> SPI NOR chip
> -------------------------------
>
> drivers/mtd/spi-nor/spi-nor.c: spi-nor core
> drivers/mtd/spi-nor/m25p80.c: mtd uclass driver
> which is an interface layer b/w spi-nor core drivers/spi
> drivers/mtd/spi-nor/fsl_qspi.c: spi-nor controller driver(mtd uclass)
>
> Changes for v6:
> - Fixed git bisectable issues, with buildman.
> - Fixed spi-nor compilation issues
> - newly designed changes.
>
> Changes for v5:
> - newly designed changes
>
> Testing:
> $ git clone git://git.denx.de/u-boot-spi.git
> $ cd u-boot-spi
> $ git checkout -b spi-nor origin/spi-nor

Please test this series?

thanks!
-- 
Jagan.