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    • D
      [PATCH] RTC framework driver for CMOS RTCs · 7be2c7c9
      David Brownell 提交于
      This is an "RTC framework" driver for the "CMOS" RTCs which are standard on
      PCs and some other platforms.  That's MC146818 compatible silicon.
      Advantages of this vs.  drivers/char/rtc.c (use one _or_ the other, only
      one will be able to claim the RTC irq) include:
      
       - This leverages both the new RTC framework and the driver model; both
         PNPACPI and platform device modes are supported.  (A separate patch
         creates a platform device on PCs where PNPACPI isn't configured.)
      
       - It supports common extensions like longer alarms.  (A separate patch
         exports that information from ACPI through platform_data.)
      
       - Likewise, system wakeup events use "real driver model support", with
         policy control via sysfs "wakeup" attributes and and using normal rtc
         ioctls to manage wakeup.  (Patch in the works.  The ACPI hooks are
         known; /proc/acpi/alarm can vanish.  Making it work with EFI will
         be a minor challenge to someone with e.g. a MiniMac.)
      
      It's not yet been tested on non-x86 systems, without ACPI, or with HPET.
      And the RTC framework will surely have teething pains on "mainstream"
      PC-based systems (though must embedded Linux systems use it heavily), not
      limited to sorting out the "/dev/rtc0" issue (udev easily tweaked).  Also,
      the ALSA rtctimer code doesn't use the new RTC API.
      
      Otherwise, this should be a no-known-regressions replacement for the old
      drivers/char/rtc.c driver, and should help the non-embedded distros (and
      the new timekeeping code) start to switch to the framework.
      
      Note also that any systems using "rtc-m48t86" are candidates to switch over
      to this more functional driver; the platform data is different, and the way
      bytes are read is different, but otherwise those chips should be compatible.
      
      [akpm@osdl.org: sparc32 fix]
      [akpm@osdl.org: sparc64 fix]
      Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
      Cc: Woody Suwalski <woodys@xandros.com>
      Cc: Alessandro Zummo <alessandro.zummo@towertech.it>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      7be2c7c9
  16. 11 12月, 2006 1 次提交
  17. 08 12月, 2006 1 次提交
  18. 01 10月, 2006 1 次提交
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  20. 15 7月, 2006 1 次提交
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  22. 29 6月, 2006 1 次提交
  23. 26 6月, 2006 4 次提交