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

From	Heikki Krogerus <heikki.krogerus@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCHv3 1/2] usb: USB Type-C connector class
Date	2016-06-22 16:50 +0200
Message-ID	<rMRDA-4He-19@gated-at.bofh.it> (permalink)
References	(2 earlier) <rMAt3-29u-11@gated-at.bofh.it> <rMN6W-1Ju-33@gated-at.bofh.it> <rMNqi-25n-19@gated-at.bofh.it> <rMOPo-2Q3-19@gated-at.bofh.it> <rMQRc-4bC-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, Jun 22, 2016 at 03:47:03PM +0200, Oliver Neukum wrote:
> On Wed, 2016-06-22 at 14:44 +0300, Heikki Krogerus wrote:
> > If our port is DRD (which would be DRP in the port controller spec),
> > the supported_power_roles will list:
> > 
> >         device, host
> > 
> > And the power role, if the port is Source only, the
> > supported_power_roles will list:
> > 
> >         source
> > 
> > If the port is Sink only, the supported_power_roles will list:
> > 
> >         sink
> > 
> > If our port is DRP, the supported_power_roles will list:
> > 
> >         source, sink
> > 
> > What is there that is missing? We are able to express all the types of
> > "Roles Supported" that the DEVICE_CAPABILITIES define, no?
> 
> No, because these are distinct in time. Some ports are DRP so they
> support
> 
> device, host
> 
> at the same time. Some ports can be switched between DFP and UFP
> they then either support host or device. But you lose the information
> that the ports can be switched.

You can't ever be host and device at the same time. Just like you
can't ever be source and sink at the same time.

Are we now talking about how should a port be advertised to the
partners? So basically, do you want to be able to program the port to
be DFP only, UFP only or DRP from user space?


Thanks,

-- 
heikki

Thread

[PATCHv3 0/2] USB Type-C Connector class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-21 17:00 +0200
  [PATCHv3 2/2] usb: typec: add driver for Intel Whiskey Cove PMIC USB Type-C PHY Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-21 17:00 +0200
  Re: [PATCHv3 1/2] usb: USB Type-C connector class Oliver Neukum <oneukum@suse.com> - 2016-06-21 22:30 +0200
    Re: [PATCHv3 1/2] usb: USB Type-C connector class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-22 12:00 +0200
      Re: [PATCHv3 1/2] usb: USB Type-C connector class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-22 12:10 +0200
        Re: [PATCHv3 1/2] usb: USB Type-C connector class Oliver Neukum <oneukum@suse.com> - 2016-06-22 14:00 +0200
      Re: [PATCHv3 1/2] usb: USB Type-C connector class Oliver Neukum <oneukum@suse.com> - 2016-06-22 12:20 +0200
        Re: [PATCHv3 1/2] usb: USB Type-C connector class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-22 13:50 +0200
          Re: [PATCHv3 1/2] usb: USB Type-C connector class Oliver Neukum <oneukum@suse.com> - 2016-06-22 16:00 +0200
            Re: [PATCHv3 1/2] usb: USB Type-C connector class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-22 16:50 +0200
              Re: [PATCHv3 1/2] usb: USB Type-C connector class Oliver Neukum <oneukum@suse.com> - 2016-06-22 19:20 +0200
                Re: [PATCHv3 1/2] usb: USB Type-C connector class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-23 10:30 +0200
                Re: [PATCHv3 1/2] usb: USB Type-C connector class Oliver Neukum <oneukum@suse.com> - 2016-06-23 10:50 +0200
                Re: [PATCHv3 1/2] usb: USB Type-C connector class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-23 14:10 +0200
                Re: [PATCHv3 1/2] usb: USB Type-C connector class Roger Quadros <rogerq@ti.com> - 2016-06-23 14:30 +0200
                Re: [PATCHv3 1/2] usb: USB Type-C connector class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-23 15:20 +0200
                Re: [PATCHv3 1/2] usb: USB Type-C connector class Guenter Roeck <linux@roeck-us.net> - 2016-06-23 15:30 +0200
  Re: [PATCHv3 0/2] USB Type-C Connector class Guenter Roeck <linux@roeck-us.net> - 2016-06-22 00:30 +0200
    Re: [PATCHv3 0/2] USB Type-C Connector class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-22 12:00 +0200
      Re: [PATCHv3 0/2] USB Type-C Connector class Guenter Roeck <linux@roeck-us.net> - 2016-06-22 15:30 +0200
  Re: [PATCHv3 1/2] usb: USB Type-C connector class Guenter Roeck <linux@roeck-us.net> - 2016-06-23 00:00 +0200
    Re: [PATCHv3 1/2] usb: USB Type-C connector class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-23 10:30 +0200
  Re: [PATCHv3 1/2] usb: USB Type-C connector class Roger Quadros <rogerq@ti.com> - 2016-06-23 14:00 +0200
    Re: [PATCHv3 1/2] usb: USB Type-C connector class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-06-23 15:10 +0200

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