[PATCH v3] mtd: physmap: Add Baikal-T1 physically mapped ROM support

[Miquel Raynal]

On Sun, 2020-09-20 at 11:14:44 UTC, Serge Semin wrote:
> Baikal-T1 Boot Controller provides an access to a RO storages, which are
> physically mapped into the SoC MMIO space. In particularly there are
> Internal ROM embedded into the SoC with a pre-installed firmware,
> externally attached SPI flash (also accessed in the read-only mode) and a
> memory region, which mirrors one of them in accordance with the currently
> enabled system boot mode (also called Boot ROM).
> 
> This commit adds the Internal ROM support to the physmap driver of the MTD
> kernel subsystem. The driver will create the Internal ROM MTD as long as
> it is defined in the system dts file. The physically mapped SPI flash
> region will be used to implement the SPI-mem interface. The mirroring
> memory region won't be accessible directly since it's redundant due to
> both bootable regions being exposed anyway.
> 
> Note we had to create a dedicated code for the ROMs since read from the
> corresponding memory regions must be done via the dword-aligned addresses.
> 
> Signed-off-by: Serge Semin <Sergey.Semin at baikalelectronics.ru>
> Cc: Alexey Malahov <Alexey.Malahov at baikalelectronics.ru>
> Cc: Pavel Parkhomenko <Pavel.Parkhomenko at baikalelectronics.ru>
> Cc: Lee Jones <lee.jones at linaro.org>
> Cc: linux-mips at vger.kernel.org

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/next, thanks.

Miquel