Hi, Peter Chen <hzpeterchen@xxxxxxxxx> writes: > Hi all, > > When I review the patch [1] for adding companion controller support for > OTG framework, I am puzzled several concepts, like shared hcd and > companion controller, companion hcd, companion port, would someone > please explain them? And why EHCI/OHCI do not use shared hcd, but > xHCI uses it? Thanks. xHCI is modeled as two separate buses (High-speed and Super-speed) which *share* the same IP block. In the case of EHCI/OHCI, there is a port being handed over to the a completely separate IP. OHCI is EHCI's companion for non-HS signalling. -- balbi
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