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    rtc: at91sam9 RTC support (RTT and/or RTC) · 4cdf854f
    David Brownell 提交于
    AT91sam9 RTC support, primarily in the form of an RTT-as-RTC driver that was
    extracted from 2.6.23-at91 patch and updated:
    
     - Relies on now-merged platform updates, which associate the RTT
       hardware address with each RTT and use the "at91_rtt" name.
    
     - RTC framework related fixes and cleanups, notably:
        * removed now-needless suspend/resume clock offset logic
        * alarm read/write now respects the "enabled" flag
        * suspend always disables update irqs
        * shutdown (and startup) disables all irqs
    
     - Misc cleanup:
        * use dev_*() messaging
        * add comments
        * remove globals,
        * ... etc
    
     - Don't force use of RTT0 and GPBR0.  Either resource may need
       to be used for other purposes (like NO_HZ support).
    
     - Update "AT91RM9200 RTC" Kconfig to allow it on SAM9RL chips
       (it has both RTT and RTC).
    
    Driver binding uses bus_find_device() to avoid needing any kind of "timer
    library" code when there's more than one RTT module.  (This timer can be used
    as an RTC, to support NO_HZ operation, or potentially for other stuff.  The
    choice is a per-system policy.)
    Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
    Cc: Michel Benoit <murpme@gmail.com>
    Cc: Nicolas Ferre <nicolas.ferre@rfo.atmel.com>
    Cc: Andrew Victor <linux@maxim.org.za>
    Cc: Russell King <rmk@arm.linux.org.uk>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    4cdf854f
Makefile 2.0 KB