[v6] USB: serial: ftdi_sio: Add MTP NVM support

[Johan Hovold <johan@kernel.org>]

On Sun, Jul 15, 2018 at 10:30:39PM +0200, Loic Poulain wrote:
> Hi Johan,
> 
> Thanks for the review.
> 
> On 10 July 2018 at 11:19, Johan Hovold <johan@kernel.org> wrote:

> > The CBUS configuration is stored in just a couple of words at a known
> > offset and could easily be retrieved without depending on the nvmem
> > subsystem when needed.
> >
> > As I assume fiddling with the EEPROM should be rare (e.g. done during
> > development or by hobbyists) and would still depend user-space tools
> > (e.g. for layouts, checksums and external EEPROMs), I think we should
> > just leave it all to user space to deal with.
> 
> I'm fine with that, to be honest I'm interested in adding GPIO control
> but wanted to progress step by step, EEPROM access being the first one.
> I thought it could have been valuable to expose it via nvmem, but like you said,
> we can keep this internal for now.
> 
> So, I'll come back with new patche(s) for CBUS GPIOs.

Sounds good!

Thanks,
Johan
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