From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: avorontsov@ru.mvista.com
Cc: dbrownell@users.sourceforge.net, greg@kroah.com,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
linuxppc-dev@ozlabs.org,
Andrew Morton <akpm@linux-foundation.org>,
leoli@freescale.com, timur@freescale.com
Subject: Re: [PATCH 3/3] USB: driver for Freescale QUICC Engine USB Host Controller
Date: Wed, 24 Sep 2008 14:48:58 +0400 [thread overview]
Message-ID: <48DA1B1A.8050507@ru.mvista.com> (raw)
In-Reply-To: <48DA1544.5010307@ru.mvista.com>
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
next prev parent reply other threads:[~2008-09-24 10:49 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-18 15:16 [PATCH 0/3] Patches to support QE USB Host Controller Anton Vorontsov
2008-09-18 15:16 ` Anton Vorontsov
2008-09-18 15:17 ` [PATCH 1/3] gpiolib: make gpio_to_chip() public Anton Vorontsov
2008-09-18 15:17 ` Anton Vorontsov
2008-09-18 15:17 ` [PATCH 2/3] powerpc/qe: new call to revert a gpio to a dedicated function Anton Vorontsov
2008-09-18 15:17 ` Anton Vorontsov
2008-09-18 15:17 ` [PATCH 3/3] USB: driver for Freescale QUICC Engine USB Host Controller Anton Vorontsov
2008-09-18 15:17 ` Anton Vorontsov
2008-09-19 23:23 ` Andrew Morton
2008-09-19 23:23 ` Andrew Morton
2008-09-23 18:31 ` Anton Vorontsov
2008-09-23 18:31 ` Anton Vorontsov
2008-09-23 18:32 ` [PATCH 1/2] USB: Protect hcd.h from multiple inclusions Anton Vorontsov
2008-09-23 18:32 ` Anton Vorontsov
2008-09-23 18:32 ` [PATCH 2/2] USB: driver for Freescale QUICC Engine USB Host Controller Anton Vorontsov
2008-09-23 18:32 ` Anton Vorontsov
2008-09-23 21:32 ` [PATCH 3/3] " Sergei Shtylyov
2008-09-23 21:32 ` Sergei Shtylyov
2008-09-23 21:35 ` Sergei Shtylyov
2008-09-23 21:35 ` Sergei Shtylyov
2008-09-23 22:57 ` Anton Vorontsov
2008-09-23 22:57 ` Anton Vorontsov
2008-09-24 10:24 ` Sergei Shtylyov
2008-09-24 10:24 ` Sergei Shtylyov
2008-09-24 10:48 ` Sergei Shtylyov [this message]
2008-09-24 18:59 ` David Brownell
2008-09-24 18:59 ` David Brownell
2008-09-24 19:17 ` Sergei Shtylyov
2008-09-24 19:17 ` Sergei Shtylyov
-- strict thread matches above, loose matches on Subject: below --
2008-08-08 16:17 [PATCH 0/3] Patches to support QE " Anton Vorontsov
2008-08-08 16:18 ` [PATCH 3/3] USB: driver for Freescale QUICC Engine " Anton Vorontsov
2008-08-08 16:18 ` Anton Vorontsov
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