rtc: document the sysfs interface
The sysfs interface to the RTC class drivers is currently undocumented. Add some basic documentation defining the semantics of the fields. Signed-off-by: NMatthew Garrett <mjg@redhat.com> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: NAlessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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