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

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Date:	Thu, 9 May 2013 15:36:45 +0200
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Srinivas KANDAGATLA <srinivas.kandagatla@...com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Will Deacon <will.deacon@....com>, jslaby@...e.cz,
	Russell King <linux@....linux.org.uk>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-doc@...r.kernel.org,
	Stephen Gallimore <stephen.gallimore@...com>,
	linux-serial@...r.kernel.org, Jason Cooper <jason@...edaemon.net>,
	devicetree-discuss@...ts.ozlabs.org,
	Rob Herring <rob.herring@...xeda.com>,
	Stuart Menefy <stuart.menefy@...com>,
	Stephen Warren <swarren@...dia.com>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/8] serial:st-asc: Add ST ASC driver.

On 20:35 Wed 08 May     , Arnd Bergmann wrote:
> On Wednesday 08 May 2013, Nicolas Pitre wrote:
> > I tried to fix this up over 10 years ago.  RMK tried as well. This 
> > failed because X86 people insisted on always having COM1 as /dev/ttyS0, 
> > COM3 as /dev/ttyS2 and so on, even when some of them weren't present.
> > 
> > A common and dynamic namespace eventually succeeded for hard disks.
> > Maybe people are ready to accept it for serial ports as well now?
> 
> Unfortunately it only worked for hard disks because the old name
> space was abandoned entirely. It also caused a lot of surprises
> for people upgrading their kernels, which is something we probably
> don't want to repeat.
> 
> Now we could add a new dynamic registration facility to the tty
> layer for drivers that don't already have a name and dev_t
> associated with the driver, and then use it for all new drivers
> as well as those that intentionally want to convert.

specially that we use devtmpfs and udev

we do not care much about minor/major
> 
> With DT aliases, we already have a way to enumerate serial ports
> across device drivers, so if we are going to do something new,
> we should make sure it works with the numbers defined there.
> 
> 	Arnd
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