linux-kernel - Re: [PATCH] serial: rewrite pxa2xx-uart to use 8250

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Message-ID: <20131206001728.GJ4360@n2100.arm.linux.org.uk>
Date:	Fri, 6 Dec 2013 00:17:28 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Sergei Ianovich <ynvich@...il.com>, linux-kernel@...r.kernel.org,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Jiri Slaby <jslaby@...e.cz>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Zhou Zhu <zzhu3@...vell.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	John Crispin <blogic@...nwrt.org>,
	"moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
	"open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>
Subject: Re: [PATCH] serial: rewrite pxa2xx-uart to use 8250_core

On Thu, Dec 05, 2013 at 04:02:53PM -0800, Greg Kroah-Hartman wrote:
> On Fri, Dec 06, 2013 at 03:28:37AM +0400, Sergei Ianovich wrote:
> > pxa2xx-uart was a separate uart platform driver. It was declaring
> > the same device names and numbers as 8250 driver. As a result,
> > it was impossible to use 8250 driver on PXA SoCs.
> > 
> > Upon closer examination pxa2xx-uart turned out to be a clone of
> > 8250_core driver.
> > 
> > Signed-off-by: Sergei Ianovich <ynvich@...il.com>
> > CC: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> > CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> Wonderful!
> 
> Can someone else test this to verify it works for them on their platform
> as well?

I may be able to - one of the downsides though is that many of these
systems had hard-coded scripts which started a getty on the original
port - and that kind of makes it difficult to sort out.  This kind of
change becomes very much one of Linus' "flag days".

So I'd suggest that we have a period where the old driver is still
available, so at least people can choose to use the old major/minor
numbers for a while.
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