Re: [PATCH 00/10] drm/i915/spi: spi access for discrete graphics

Miquel Raynal
2023-09-27T14:55:05Z

Hi Mark,

broonie@kernel.org wrote on Wed, 27 Sep 2023 16:37:35 +0200:

> On Wed, Sep 27, 2023 at 02:11:47PM +0000, Usyskin, Alexander wrote:
>
> > There is a Discreet Graphic device with embedded SPI (controller & flash).
> > The embedded SPI is not visible to OS.
> > There is another HW in the chip that gates access to the controller and
> > exposes registers for:
> > region select; read and write (4 and 8 bytes); erase (4K); error register;
>
> So assuming that's flash region select it sounds like this is a MTD
> controller and the fact that there's SPI isn't really relevant at all
> from a programming model point of view and it should probably be
> described as a MTD controller of some kind. Does that sound about
> right?

Yeah in this case it seems the best option if the OS only has access to
a very small subset of what the spi controller can do.

Thanks,
Miquèl