[PATCH v2] drm/panel: db7430: Add driver for Samsung DB7430

[Doug Anderson]

Hi,

On Fri, Jun 4, 2021 at 4:19 PM Linus Walleij <linus.walleij at linaro.org> wrote:
>
> On Tue, Jun 1, 2021 at 11:31 PM Doug Anderson <dianders at chromium.org> wrote:
>
> > Still hoping that this can work atop DBI so we can avoid the raw SPI
> > writes. You said you're trying for it for v3 so I'm looking forward to
> > checking it out there.
>
> Struggling with this. The DBI bus is only used by tiny DRM
> for the panel drivers that are jitted with that display controller
> ATM. No normal panel driver is using it.

:( So how about this, then?

* If someone more senior than me in DRM says it's fine to just do this
directly for now then I have no objections. It'd be nice to mention
that this is actually DBI "type c1" somewhere in the comments, but
other than that the direct SPI stuff is OK.

* If there are 3+ other panels drivers that you can point to that
directly use SPI functions for DBI like you are doing then I'm OK w/
it too even if nobody more senior signs on w/ it. Presumably if there
are at least 3 already then someone else has already signed on to the
fact that this is fine to do. It'd still be nice to do a cleanup but
presumably that could all be done at the same time.

* If you're the first or second or third panel driver that's doing
this directly with SPI commands then it probably makes sense to pause
and figure out how to use DBI right now before more drivers come
around and copy the code.

Hopefully that sounds OK.

-Doug