Re: [PATCH 3/3] USB: driver for Freescale QUICC Engine USB Host Controller

[Sergei Shtylyov]

Hello, I wrote:

> > > > > > > This controller does not integrate the root hub, so this driver 
> > > > > > > also
> > > > > > > fakes one-port hub. External hub is required to support more than
> > > > > > > one device.
> > > > > > >
> > > > > > > ...
> > > > > > >
> > > > > > >                   
> > > > > > Please, no.
> > > > > >               
> > > > > What exactly 'no'? ;-)
> > > > >           
> > > >   No one-port hubs I guess -- they are pointless. Though e.g. MUSB  
> > > > driver creates one -- I guess to impersonate a transaction 
> > > > translating  high-speed hub...
> > > >
> > > >       
> > >   ... then the root hub emulation is completely pointless.
> > >     
> >
> > It isn't. We always should emulate the root hub. The root hub
> > is part and parcel of any USB Host. Even the one-port one.
>
>   Hm, maybe that's what USB core thinks (because UHCI/OHCI/EHCI all 
> have it) but e.g. MUSB doesn't have the root hub registers...

  Oops, I stand corrected. Even USB 1.1 specifies that it must be a 
part the host...

WBR, Sergei


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