From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from buildserver.ru.mvista.com (unknown [85.21.88.6]) by ozlabs.org (Postfix) with ESMTP id 06A42DDF25 for ; Wed, 24 Sep 2008 08:57:33 +1000 (EST) Date: Wed, 24 Sep 2008 02:57:30 +0400 From: Anton Vorontsov To: Sergei Shtylyov Subject: Re: [PATCH 3/3] USB: driver for Freescale QUICC Engine USB Host Controller Message-ID: <20080923225730.GB13617@oksana.dev.rtsoft.ru> References: <20080918151659.GA20140@oksana.dev.rtsoft.ru> <20080918151746.GC31187@oksana.dev.rtsoft.ru> <20080919162324.e354ed2f.akpm@linux-foundation.org> <20080923183129.GA19024@oksana.dev.rtsoft.ru> <48D96052.6090005@ru.mvista.com> <48D9612D.7060601@ru.mvista.com> MIME-Version: 1.0 Content-Type: text/plain; charset=windows-1251 In-Reply-To: <48D9612D.7060601@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 , leoli@freescale.com, timur@freescale.com Reply-To: avorontsov@ru.mvista.com List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wed, Sep 24, 2008 at 01:35:41AM +0400, Sergei Shtylyov 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. -- Anton Vorontsov email: cbouatmailru@gmail.com irc://irc.freenode.net/bd2 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755970AbYIWW5l (ORCPT ); Tue, 23 Sep 2008 18:57:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751681AbYIWW5c (ORCPT ); Tue, 23 Sep 2008 18:57:32 -0400 Received: from rtsoft3.corbina.net ([85.21.88.6]:31383 "EHLO buildserver.ru.mvista.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751313AbYIWW5b (ORCPT ); Tue, 23 Sep 2008 18:57:31 -0400 Date: Wed, 24 Sep 2008 02:57:30 +0400 From: Anton Vorontsov To: Sergei Shtylyov Cc: Andrew Morton , dbrownell@users.sourceforge.net, greg@kroah.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, leoli@freescale.com, timur@freescale.com Subject: Re: [PATCH 3/3] USB: driver for Freescale QUICC Engine USB Host Controller Message-ID: <20080923225730.GB13617@oksana.dev.rtsoft.ru> Reply-To: avorontsov@ru.mvista.com References: <20080918151659.GA20140@oksana.dev.rtsoft.ru> <20080918151746.GC31187@oksana.dev.rtsoft.ru> <20080919162324.e354ed2f.akpm@linux-foundation.org> <20080923183129.GA19024@oksana.dev.rtsoft.ru> <48D96052.6090005@ru.mvista.com> <48D9612D.7060601@ru.mvista.com> MIME-Version: 1.0 Content-Type: text/plain; charset=windows-1251 Content-Disposition: inline In-Reply-To: <48D9612D.7060601@ru.mvista.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 24, 2008 at 01:35:41AM +0400, Sergei Shtylyov 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. -- Anton Vorontsov email: cbouatmailru@gmail.com irc://irc.freenode.net/bd2