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| author | Jonathan Cameron <jic23@cam.ac.uk> | 2009-01-06 14:42:12 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-06 15:59:24 -0800 |
| commit | 5d2a50371ddf127afa782ad3147469be8e9bd69f (patch) | |
| tree | bc7b7032512c17f493e5f656044c79c17952f517 /drivers/rtc/rtc-vr41xx.c | |
| parent | 2fac6674ddf3164da42a76d62f8912073d629a30 (diff) | |
| download | linux-5d2a50371ddf127afa782ad3147469be8e9bd69f.tar.gz | |
rtc: move power of 2 periodic frequency check down into drivers
Move the power of 2 check on frequencies down into individual rtc drivers This is to allow for non power of 2 real time clock periodic interrupts such as those on the pxa27x to be found in the new pxa27x-rtc driver Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-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 'drivers/rtc/rtc-vr41xx.c')
| -rw-r--r-- | drivers/rtc/rtc-vr41xx.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-vr41xx.c b/drivers/rtc/rtc-vr41xx.c index 57b7aac092a3..f11297aff854 100644 --- a/drivers/rtc/rtc-vr41xx.c +++ b/drivers/rtc/rtc-vr41xx.c @@ -27,6 +27,7 @@ #include <linux/rtc.h> #include <linux/spinlock.h> #include <linux/types.h> +#include <linux/log2.h> #include <asm/div64.h> #include <asm/io.h> @@ -210,6 +211,8 @@ static int vr41xx_rtc_irq_set_freq(struct device *dev, int freq) { unsigned long count; + if (!is_power_of_2(freq)) + return -EINVAL; count = RTC_FREQUENCY; do_div(count, freq); |