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

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Message-ID: <20160524093233.GA26874@kuha.fi.intel.com>
Date:	Tue, 24 May 2016 12:32:33 +0300
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	Oliver Neukum <oneukum@...e.com>
Cc:	Andy Shevchenko <andy.shevchenko@...il.com>,
	Rajaram R <rajaram.officemail@...il.com>,
	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [RFC PATCHv2] usb: USB Type-C Connector Class

On Mon, May 23, 2016 at 01:25:19PM +0200, Oliver Neukum wrote:
> So for Alternate Modes we need on a high level the following features
> 
> 1. discovery of available Alternate Modes
> 2. selection of an Alternate Mode
> 3. notification about entering an Alternate Mode
> 4. triggering a reset
> 5. notification about resets
> 
> 6. discovery about the current role
> 7. switching roles
> 8. setting preferred roles (Try.SRC and Try.SNK)
> 
> You covered 1. and 2.
> 3. can be covered by specific drivers
> 4. and 5. are not covered (and it makes no sense to tie it
> to specific drivers)
> 
> 6. and 7. is covered
> 8. is not
> 
> And 8. needs to be covered. It affects who selects the Alternate Mode.
> You cannot tie it to USB and it doesn't fit with pure PD stuff.
> 
> I like your API as it is now. But it is incomplete.

OK, Got it.


Thanks Oliver,

-- 
heikki