From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Subject: Re: [RFC 1/8] serial:st-asc: Add ST ASC driver. Date: Wed, 8 May 2013 18:31:48 +0200 Message-ID: <201305081831.48566.arnd@arndb.de> References: <1368022187-1633-1-git-send-email-srinivas.kandagatla@st.com> <20130508161527.GA28080@kroah.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20130508161527.GA28080@kroah.com> Sender: linux-doc-owner@vger.kernel.org To: Greg KH Cc: Jean-Christophe PLAGNIOL-VILLARD , Srinivas KANDAGATLA , Viresh Kumar , Will Deacon , jslaby@suse.cz, Russell King , Samuel Ortiz , Nicolas Pitre , linux-doc@vger.kernel.org, Stephen Gallimore , linux-serial@vger.kernel.org, Jason Cooper , devicetree-discuss@lists.ozlabs.org, Rob Herring , Stuart Menefy , Stephen Warren , Dong Aisheng , linux-arm-kernel@lists.infradead.org, Mark Brown , linux-kernel@vger.kernel.org List-Id: linux-serial@vger.kernel.org On Wednesday 08 May 2013, Greg KH wrote: > > just mention there is not hardware reason to not use the generic ttySx > > in place of ttyAS as we have only one IP that handle serial on this > > family of SoC > > > > personally I'll switch to ttySx > > Great, then you can use the same major/minor range as well, so there's > no more objection from me about this :) Does that work these days when you have kernel with multiple built-in uart drivers? I think it would be good if all uarts were using the same name space and major/minor numbers, but I think the mess we currently have is the result of the tty_register_driver() interface reserving the device number range at driver load time, independent of the presence of devices. I would assume that normal distro kernels always ship with an 8250 driver built-in to allow using that as the console, and if I read the code correctly, that currently prevents another uart driver from registering the same major/minor numbers. Arnd From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Wed, 8 May 2013 18:31:48 +0200 Subject: [RFC 1/8] serial:st-asc: Add ST ASC driver. In-Reply-To: <20130508161527.GA28080@kroah.com> References: <1368022187-1633-1-git-send-email-srinivas.kandagatla@st.com> <20130508161527.GA28080@kroah.com> Message-ID: <201305081831.48566.arnd@arndb.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wednesday 08 May 2013, Greg KH wrote: > > just mention there is not hardware reason to not use the generic ttySx > > in place of ttyAS as we have only one IP that handle serial on this > > family of SoC > > > > personally I'll switch to ttySx > > Great, then you can use the same major/minor range as well, so there's > no more objection from me about this :) Does that work these days when you have kernel with multiple built-in uart drivers? I think it would be good if all uarts were using the same name space and major/minor numbers, but I think the mess we currently have is the result of the tty_register_driver() interface reserving the device number range at driver load time, independent of the presence of devices. I would assume that normal distro kernels always ship with an 8250 driver built-in to allow using that as the console, and if I read the code correctly, that currently prevents another uart driver from registering the same major/minor numbers. Arnd