[PATCH v2 1/3] Revert "mtd: spi-nor: remove Fujitsu MB85RS1MT support"

[Ronan Dalton]

Hi Michael,

On Wed, 2026-07-01 at 10:12 +0200, Michael Walle wrote:
> > The SPI-NOR subsystem has support for the cy15x104q chips, which
> > are
> > FRAM chips. There is also support for Everspin MRAM chips, which
> > are
> > comparible to FRAM (and are also of small size).
> 
> Yeah, these are mostly old parts, (except for the newer cypress
> thing, which
> was a mistake to add). But there is little we can do, but to
> eventually remove them in the future when it's likely no boards are
> using them anymore. Thus, we don't want to add newer parts to this
> list and make it even harder for us to get rid of these.

I understand. Thanks for clarifying this.

> 
> > Because of this, we thought there was precident to add support for
> > this
> > chip. I was under the impression that the opcodes used to interact
> > with
> > the chip had a greater significance than the underlying technology
> > used,
> > and this chip fits in with the other spi-nor chips based on that.
> > Feel
> > free to correct me if I'm wrong here.
> 
> I'd argue, if they really wanted to emulate a flash device, they
> would have added an (emulated) erase opcode. Without it, it behaves
> like an EEPROM which has byte granularity access.

Regards,
Ronan.