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authorMike Frysinger <vapier.adi@gmail.com>2007-11-14 16:58:43 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-11-14 18:45:37 -0800
commit108b4c3638be251d6b42eaa633e8a6b852b960f0 (patch)
treed589748dee20f9a20739c8cc72c8b0b168cce939 /Documentation/rtc.txt
parentfcbaa088fc8625381bd1096bc2eedc4f58a1572c (diff)
downloadlinux-linaro-stable-108b4c3638be251d6b42eaa633e8a6b852b960f0.tar.gz
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: Mike Frysinger <vapier@gentoo.org> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/rtc.txt')
-rw-r--r--Documentation/rtc.txt7
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/rtc.txt b/Documentation/rtc.txt
index c931d613f641..e20b19c1b60d 100644
--- a/Documentation/rtc.txt
+++ b/Documentation/rtc.txt
@@ -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!