On Wed, 11 May 2016, Roger Quadros wrote:

quoted

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

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