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Date:	Sat, 21 May 2016 08:43:59 +0200
From:	Oliver Neukum <>
To:	Guenter Roeck <>
Cc:	Heikki Krogerus <>,
	Andy Shevchenko <>,
	Rajaram R <>,
	Felipe Balbi <>,
	Mathias Nyman <>,
	Greg KH <>,,
Subject: Re: [RFC PATCHv2] usb: USB Type-C Connector Class

On Fri, 2016-05-20 at 22:51 -0700, Guenter Roeck wrote:
> 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.


from a purely formal point of view that makes sense.

>From a usability viewpoint I'd ideally want all controls
for role at one place. And possibly the controls for modes
at the same place.

I think part of the problem here is that we lack a statement
of mission. What are these controls for?
Merely for controlling modes and providing information
about modes? And to use neutral terms only for the "master"
side or both sides?


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