Add a driver to configure the XO-1 RTC via CS5536 MSRs, to be used as a
system wakeup source via olpc-xo1-pm.

Device detection is based on finding the relevant device tree node.
Signed-off-by: NDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-11-git-send-email-dsd@laptop.orgAcked-by: NAndres Salomon <dilinger@queued.net>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
Reviewed-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: devicetree-discuss@lists.ozlabs.org
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>