tree b3863ed198037668cb80df710678a6e249842654
parent d691eb901e044065de10756ea78a5758d457c7fd
author David Brownell <david-b@pacbell.net> 1192523296 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1192552993 -0700

rtc_irq_set_freq() requires power-of-two and associated kerneldoc

RTC periodic IRQs are only defined to work for 2^N Hz values.  This patch
moves that validity check into the infrastructure, so drivers don't need to
check it; and adds kerneldoc for the two interface functions related to
periodic IRQs.  (One of which was quite mysterious until its first use was
recently checked in!)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>