[PATCH 2/4] mtd: spi-nor: Allow flashes to specify MTD writesize

[Tudor Ambarus]

Hi, Takahiro!


On 4/15/24 05:33, tkuw584924 at gmail.com wrote:
> From: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>
> 
> Some flashes like the Infineon SEMPER NOR flash family use ECC. Under
> this ECC scheme, multi-pass writes to an ECC block is not allowed.
> In other words, once data is programmed to an ECC block, it can't be
> programmed again without erasing it first.
> 
> Upper layers like file systems need to be given this information so they
> do not cause error conditions on the flash by attempting multi-pass
> programming. This can be done by setting 'writesize' in 'struct
> mtd_info'.
> 
> Set the default to 1 but allow flashes to modify it in fixup hooks. If
> more flashes show up with this constraint in the future it might be
> worth it to add it to 'struct flash_info', but for now increasing its
> size is not worth it.
> 
> Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>
Please specify when a patch follows linux upstream. This follows the
following upstream linux commit:

afd473e85827 ("mtd: spi-nor: core: Allow flashes to specify MTD writesize")

Acked-by: Tudor Ambarus <tudor.ambarus at linaro.org>