Re: [PATCH 1/4] ARM: dts: am437x-gp-evm: add HDMI support

[Tony Lindgren <tony@atomide.com>]

* Tomi Valkeinen <tomi.valkeinen@ti.com> [191213 12:34]:
> On 13/12/2019 14:28, Laurent Pinchart wrote:
> 
> > > So... In the DT file, we would have multiple endpoints in the same output port in DSS, one going to
> > > the panel, one to the SiI9022? omapdrm could then create two encoders, one abstracting the DPI
> > > output and the connection to the panel, one abstracting the DPI output and SiI9022?
> > 
> > That's the idea, yes.
> > 
> > > And then someone would need to handle the GPIO, and set it based on the output used. These kind of
> > > gpios are always difficult, as they don't belong anywhere =).
> > 
> > https://lore.kernel.org/lkml/20191211061911.238393-5-hsinyi@chromium.org/
> > 
> > Still, the infrastructure in omapdrm would need quite a bit of work.
> > We're just about to get a helper layer for linear pipelines merged, and
> > we already need to go one step further :-)
> 
> Alright, sounds like this will be doable in the future. So let's drop this
> and the epos HDMI patches for now.

Oh OK. Sounds like no other solution is usable right now short of
separate dts files like you've done.

> This does sound like quite a bit of work, as you say, so I have no idea when
> we can get there (on the omapdrm side). In the minimum we should first get
> the big omapdrm rework done, in order to avoid nasty conflicts.
> 
> Thanks for educating me =).

Sounds a nice plan though :)

Thanks,

Tony