linux-kernel - Re: [PATCHv3 1/2] usb: USB Type-C connector class

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Date:	Tue, 21 Jun 2016 22:25:05 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCHv3 1/2] usb: USB Type-C connector class

On Tue, 2016-06-21 at 17:51 +0300, Heikki Krogerus wrote:
> +What:          /sys/class/typec/<port>/supported_data_roles
> +Data:          June 2016
> +Contact:       Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> +Description:
> +               Lists the USB data roles, host or device, the port is
> capable
> +               of supporting.

On third thought, this is a problem. Looking at 4.4.8.1
DEVICE_CAPABILITIES (Required) of USB Type-C Port Controller
Interface Specification we lack capability.

A port that can do DRP is not the same thing as a port that
can be switched between DFP and UFP. We cannot express that.

	Regards
		Oliver