Re: [PATCH 3/4] drm/uapi: document the USB subconnector type

[Dmitry Baryshkov]

On 18/08/2023 09:24, Simon Ser wrote:
> On Thursday, August 17th, 2023 at 21:33, Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> wrote:
>
> > We have been looking for a way to document that the corresponding DP
> > port is represented by the USB connector on the device.
> >
> > Consequently, I believe the best way to document it, would be to use
> > DisplayPort / USB, when there is no dongle connected, switching to
> > DisplayPort / HDMI, DisplayPort / VGA, DisplayPort / DisplayPort, etc.
> > when the actual dongle / display is connected and then switching back to
> > the DisplayPort / USB when it gets disconnected.
> >
> > If this sounds good to all parties, I'll post v2, adding this
> > explanation to the cover letter.
>
> But how can user-space discover that the port is USB-C when it's
> connected? That information is lost at this point.

Yes, unfortunately.

> (In addition, this clashes with the existing semantics of the
> subconnector prop as discussed before: USB-C is not sub-, it's super-.)

Ok. How do we proceed then? Is it fine to add another property for DP 
case? Do you have any particular property name in mind? I will follow 
with addition of this property then.

--
With best wishes
Dmitry