Re: [RFC PATCHv2] usb: USB Type-C Connector Class

[Guenter Roeck]

On 05/20/2016 06:37 AM, Oliver Neukum wrote:
> On Fri, 2016-05-20 at 14:24 +0300, Heikki Krogerus wrote:
> > On Thu, May 19, 2016 at 04:47:17PM +0200, Oliver Neukum wrote:
> > > Please explain. How does that express DRP but prefered master?
> >
> > Sorry but I'm not sure what you mean here. If the port is capable of
> > being used as dual role port (DRP in the supported_data_roles file),
> > that is the only case where you can select the role with this file. So
> > I would imagine that in your case you want to make the port act as
> > DFP only, right? But if the port is capable of acting only as UFP, you
> > are stuck with that role.
>
> How do I trigger that Try.SRC is to be used on a port?

This would be part of the USB PD protocol, ie probably outside the scope
of the class code. In my implementation, I enable Try.SRC or Try.SNK based
on the platform's preferred role.

Guenter