On Wed, 11 May 2016, Roger Quadros wrote: > > What I mean is if you have 2 EHCI controllers with 2 companion > > controllers, don't you need to know which companion goes with which EHCI > > controller? Just like you do for the otg-controller property. > > > > That is a very good point. I'm not very sure and it seems that current code > won't work > with multiple EHCI + companion instances. > > Alan, does USB core even know which EHCI and OHCI are linked to the same port > or the handoff is software transparent?
The core knows. It doesn't use the information for a whole lot of things, but it does use it in a couple of places. Search for "companion" in core/hcd-pci.c and you'll see. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
