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Message-ID: <48DA1B1A.8050507@ru.mvista.com> Date: Wed, 24 Sep 2008 14:48:58 +0400 From: Sergei Shtylyov <sshtylyov@...mvista.com> To: avorontsov@...mvista.com Cc: dbrownell@...rs.sourceforge.net, greg@...ah.com, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org, Andrew Morton <akpm@...ux-foundation.org>, leoli@...escale.com, timur@...escale.com Subject: Re: [PATCH 3/3] USB: driver for Freescale QUICC Engine USB Host Controller 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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