linux-kernel - Re: [RFC 1/8] serial:st-asc: Add ST ASC driver.

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Message-Id: <0940EFC0-EB16-4C13-A3DE-4A8C4F5C6F4D@jcrosoft.com>
Date:	Thu, 9 May 2013 00:39:44 +0800
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Russell King <linux@....linux.org.uk>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Srinivas KANDAGATLA <srinivas.kandagatla@...com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	devicetree-discuss@...ts.ozlabs.org,
	Will Deacon <will.deacon@....com>,
	Stephen Gallimore <stephen.gallimore@...com>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-doc@...r.kernel.org, Stuart Menefy <stuart.menefy@...com>,
	Nicolas Pitre <nico@...aro.org>, linux-serial@...r.kernel.org,
	Stephen Warren <swarren@...dia.com>,
	linux-kernel@...r.kernel.org,
	Dong Aisheng <dong.aisheng@...aro.org>, jslaby@...e.cz,
	linux-arm-kernel@...ts.infradead.org,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: [RFC 1/8] serial:st-asc: Add ST ASC driver.

On May 9, 2013, at 12:31 AM, Arnd Bergmann <arnd@...db.de> wrote:

> 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?

not for very long time and no this family
> 
> 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.

so we need to fix this
> 
> 	Arnd
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
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