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

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Date:	Fri, 20 Feb 2009 16:46:44 +0100
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Alessandro Zummo <a.zummo@...ertech.it>
Cc:	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
Subject: [PATCH/RFC 0/5] Generic RTC class driver


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!

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone:    +32 (0)2 700 8453
Fax:      +32 (0)2 700 8622
E-mail:   Geert.Uytterhoeven@...ycom.com
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