alarm: Use system rtc for alarms

Alarm uses first registered rtc device for setting alarm
as of now. Changed this to use system rtc so time and
alarm are in sync

Bug 1698877

Change-Id: I8c04736230fb50b8fc77332549414e72e6b43bed
Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
Reviewed-on: http://git-master/r/1012790
GVS: Gerrit_Virtual_Submit
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 448515769cee424eb7d88e89f107bcb7212a1558..4f88bad4bc0f2c9be098fe7aea875b47db82304b 100644 (file)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -1,6 +1,8 @@
 /*
  * Alarmtimer interface
  *
+ * Copyright (C) 2014 NVIDIA CORPORATION. All rights reserved.
+ *
  * This interface provides a timer which is similarto hrtimers,
  * but triggers a RTC alarm if the box is suspend.
  *
@@ -25,6 +27,7 @@
 #include <linux/posix-timers.h>
 #include <linux/workqueue.h>
 #include <linux/freezer.h>
+#include <linux/device.h>
 
 /**
  * struct alarm_base - Alarm timer bases
@@ -84,6 +87,11 @@ static int alarmtimer_rtc_add_device(struct device *dev,
        if (rtcdev)
                return -EBUSY;
 
+#ifdef CONFIG_RTC_HCTOSYS_DEVICE
+       if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
+               return -EINVAL;
+#endif
+
        if (!rtc->ops->set_alarm)
                return -1;