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| author | Jean Delvare <khali@linux-fr.org> | 2006-06-25 14:48:23 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-25 19:01:14 +0200 |
| commit | 9be05b57bd9152b7c26b1599b87aeb42a102f0cf (patch) | |
| tree | c09b9505af968ffaab852c7e09db7b5262f863b9 /Documentation/rtc.txt | |
| parent | [PATCH] Add max6902 RTC support (diff) | |
| download | linux-9be05b57bd9152b7c26b1599b87aeb42a102f0cf.tar.xz linux-9be05b57bd9152b7c26b1599b87aeb42a102f0cf.zip | |
[PATCH] rtc: small documentation update
Rtc driver documentation update
* Mention the max-user-freq control file.
* Add missing header in example code.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/rtc.txt')
| -rw-r--r-- | Documentation/rtc.txt | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/rtc.txt b/Documentation/rtc.txt index 95d17b3e2eee..2a58f985795a 100644 --- a/Documentation/rtc.txt +++ b/Documentation/rtc.txt @@ -44,8 +44,10 @@ normal timer interrupt, which is 100Hz. Programming and/or enabling interrupt frequencies greater than 64Hz is only allowed by root. This is perhaps a bit conservative, but we don't want an evil user generating lots of IRQs on a slow 386sx-16, where it might have -a negative impact on performance. Note that the interrupt handler is only -a few lines of code to minimize any possibility of this effect. +a negative impact on performance. This 64Hz limit can be changed by writing +a different value to /proc/sys/dev/rtc/max-user-freq. Note that the +interrupt handler is only a few lines of code to minimize any possibility +of this effect. Also, if the kernel time is synchronized with an external source, the kernel will write the time back to the CMOS clock every 11 minutes. In @@ -81,6 +83,7 @@ that will be using this driver. */ #include <stdio.h> +#include <stdlib.h> #include <linux/rtc.h> #include <sys/ioctl.h> #include <sys/time.h> |