On Thu, Sep 15, 2016 at 06:16:38PM -0700, Stephen Boyd wrote:

quoted

For #3, it is not the
use case for this design. #3 is usually used for the single port which
needs to support switching role on the fly without disconnection.
So, you may only need to consider #2, you can't use extcon-usb-gpio.c
directly since you need to set one gpio to mux the dp/dm, Baolu Lu had
USB MUX patch set before which may satisfy your requirement. [1]

Ok. Did the usb mux patches go anywhere? It seemed to get tangled up in
DRD framework and I haven't been following along. I'll look into these
patches more.

DRD framework is denied by Felipe due to only one user can be benefit
from it (chipidea OTG), I don't know the further status of USB MUX,
maybe you can ask for it.

-- 

Best Regards,
Peter Chen