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Commit 9be05b57bd9152b7c26b1599b87aeb42a102f0cf

Authored by Jean Delvare
Committed by Linus Torvalds
1 parent 8e12ecc2b5
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

[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>

Showing 1 changed file with 5 additions and 2 deletions Side-by-side Diff

Documentation/rtc.txt
Diff comments   View file @ 9be05b5
... ... @@ -44,8 +44,10 @@
44 44 Programming and/or enabling interrupt frequencies greater than 64Hz is
45 45 only allowed by root. This is perhaps a bit conservative, but we don't want
46 46 an evil user generating lots of IRQs on a slow 386sx-16, where it might have
47   -a negative impact on performance. Note that the interrupt handler is only
48   -a few lines of code to minimize any possibility of this effect.
  47 +a negative impact on performance. This 64Hz limit can be changed by writing
  48 +a different value to /proc/sys/dev/rtc/max-user-freq. Note that the
  49 +interrupt handler is only a few lines of code to minimize any possibility
  50 +of this effect.
49 51  
50 52 Also, if the kernel time is synchronized with an external source, the
51 53 kernel will write the time back to the CMOS clock every 11 minutes. In
... ... @@ -81,6 +83,7 @@
81 83 */
82 84  
83 85 #include <stdio.h>
  86 +#include <stdlib.h>
84 87 #include <linux/rtc.h>
85 88 #include <sys/ioctl.h>
86 89 #include <sys/time.h>