提交 108b4c36 编写于 作者: M Mike Frysinger 提交者: Linus Torvalds

rtc: tweak driver documentation for rtc periodic

The max_user_freq member is not really meant for RTC drivers to modify, so
update the rtc documentation so drivers writers know what is expected of
them when handling periodic events.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>
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>
上级 fcbaa088
......@@ -180,9 +180,10 @@ driver returns ENOIOCTLCMD. Some common examples:
* RTC_IRQP_SET, RTC_IRQP_READ: the irq_set_freq function will be called
to set the frequency while the framework will handle the read for you
since the frequency is stored in the irq_freq member of the rtc_device
structure. Also make sure you set the max_user_freq member in your
initialization routines so the framework can sanity check the user
input for you.
structure. Your driver needs to initialize the irq_freq member during
init. Make sure you check the requested frequency is in range of your
hardware in the irq_set_freq function. If you cannot actually change
the frequency, just return -ENOTTY.
If all else fails, check out the rtc-test.c driver!
......
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