rtc: rtc-twl4030 don't mask alarm interrupts on shutdown

A triggering RTC alarm should be able to power on a device that has been
powered off. This patch enables that on twl4030 by not masking the alarm
interrupt at shutdown.
Signed-off-by: Matti Halme <matti.halme@nokia.com>
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Samuel Ortiz <sameo@openedhand.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-twl4030.c

@@ -482,8 +482,9 @@ static int __devexit twl4030_rtc_remove(struct platform_device *pdev)
 
 static void twl4030_rtc_shutdown(struct platform_device *pdev)
 {
-	mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M |
-			 BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
+	/* mask timer interrupts, but leave alarm interrupts on to enable
+	   power-on when alarm is triggered */
+	mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 }
 
 #ifdef CONFIG_PM