From 5d2a50371ddf127afa782ad3147469be8e9bd69f Mon Sep 17 00:00:00 2001
From: Jonathan Cameron <jic23@cam.ac.uk>
Date: Tue, 6 Jan 2009 14:42:12 -0800
Subject: 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>
---
 drivers/rtc/rtc-vr41xx.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'drivers/rtc/rtc-vr41xx.c')

diff --git a/drivers/rtc/rtc-vr41xx.c b/drivers/rtc/rtc-vr41xx.c
index 57b7aac..f11297a 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);
 
-- 
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