linux-kernel - Re: [PATCH/RFC 0/5] Generic RTC class driver

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Message-ID: <alpine.LRH.2.00.0902251054371.4063@vixen.sonytel.be>
Date:	Wed, 25 Feb 2009 10:54:54 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Helge Deller <deller@....de>
cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, Kyle McMartin <kyle@...artin.ca>,
	David Woodhouse <dwmw2@...radead.org>,
	Richard Zidlicky <rz@...ux-m68k.org>,
	linux-parisc@...r.kernel.org, linuxppc-dev@...abs.org,
	linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org,
	dann frazier <dannf@...nf.org>
Subject: Re: [PATCH/RFC 0/5] Generic RTC class driver

On Tue, 24 Feb 2009, Helge Deller wrote:
> Geert Uytterhoeven wrote:
> > I've been looking into problems with auto-loading the RTC driver on PPC (more
> > specifically on PS3):
> >   - The recent "rtc-ppc" RTC class driver is not autoloaded by udev because
> >     it's an old style platform driver that contains its own platform device.
> >   - The alternative old "genrtc" driver is autoloaded on non-udev systems only
> >     because it contains the module alias char-major-10-135. However, it's not
> >     a new-style RTC class driver.
> > 
> > Fortunately there already exists a generic RTC class driver: "rtc-parisc".
> > Despite it's name, it's platform-independent, as it's build on top of the RTC
> > abstraction used by "genrtc".
> > 
> > This patch series
> >   - adds a missing module alias to rtc-parisc,
> >   - renames rtc-parisc to rtc-generic,
> >   - converts the architectures that currently have CONFIG_GEN_RTC enabled in
> >     their defconfig (m68k, parisc, powerpc) to rtc-generic,
> >   - removes the obsolete rtc-ppc driver,
> >   - removes the old genrtc driver.
> >   
> > Note that genrtc may be used on other archictectures as well: at least alpha
> > has the required infrastructure ([gs]et_rtc_time()). The Kconfig rules allow
> > genrtc to be enabled on several others (cris, h8300, mn10300, um, x86, xtensa).
> > 
> > Furthermore genrtc and rtc-generic are not 100% userspace compatible:
> >   - /dev/rtc provided by genrtc uses a misc character device (10:135),
> >   - /dev/rtc provided by rtc-generic uses a dynamic character device.
> >   
> > So perhaps we don't want to kill gen-rtc yet?
> > 
> > Any comments are welcomed!
> 
> Hi Geert,
> FYI, I didn't followed any discussions or changes around the RTC drivers for parisc,
> but Dann Frazier did some work on the parisc RTC driver as well.
> His patches were merged (not upstream yet!) in Kyle's "rtc-parisc" branch at:
> http://git.kernel.org/?p=linux/kernel/git/kyle/parisc-2.6.git;a=shortlog;h=rtc-parisc
> 
> Not sure if they conflict (or are in sync) with your patches...

Thanks, they provide some nice cleanups.

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre Europe
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