[PATCH 1/3] dt-bindings: display: add bindings for MIPI DBI compatible SPI panels

[Rob Herring]

On Mon, Jan 24, 2022 at 10:28 AM Noralf Trønnes <noralf at tronnes.org> wrote:
>
>
>
> Den 24.01.2022 17.08, skrev Rob Herring:
> > On Sun, Jan 23, 2022 at 11:25 AM Noralf Trønnes <noralf at tronnes.org> wrote:
> >>
> >> Add binding for MIPI DBI compatible SPI panels.
> >
> > I'm sure we already have MIPI DBI panels. What's this for?
> >
>
> It aims to use one driver to cover all MIPI DBI panels where the
> controller setup is loaded from userspace in a firmware file.

What's the solution when the user wants a splash screen in the
bootloader and also wants multiple panels supported?

Also, 1 driver doesn't dictate 1 compatible. A one to many
relationship is fine and makes the decision entirely the OS's.

> The cover
> letter points to the discussion where Maxime proposed this:
>
> https://lore.kernel.org/dri-devel/20211129093946.xhp22mvdut3m67sc@houat/

The proposal there is:

> compatible = "panel-spi";
> model = "panel-from-random-place-42";

The same thing can be accomplished with this:

compatible = "panel-from-random-place-42", "panel-spi";

What's the advantage of hijacking 'model'?

Rob