[Intel-gfx] [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 at linaro.org> 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