Messages in this thread | | | Date | Wed, 24 Sep 2008 14:48:58 +0400 | From | Sergei Shtylyov <> | Subject | Re: [PATCH 3/3] USB: driver for Freescale QUICC Engine USB Host Controller |
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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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