diff --git a/drivers/dahdi/dahdi-base.c b/drivers/dahdi/dahdi-base.c
index 8bba465..c7d0607 100644
--- a/drivers/dahdi/dahdi-base.c
+++ b/drivers/dahdi/dahdi-base.c
@@ -50,6 +50,7 @@
 #include <linux/list.h>
 #include <linux/delay.h>
 #include <linux/mutex.h>
+#include <linux/time.h>
 
 #if defined(HAVE_UNLOCKED_IOCTL) && defined(CONFIG_BKL)
 #include <linux/smp_lock.h>
@@ -7404,6 +7405,7 @@ static int _dahdi_register_device(struct dahdi_device *ddev,
 		__dahdi_init_span(s);
 	}
 
+	getnstimeofday(&ddev->registration_time);
 	ret = dahdi_sysfs_add_device(ddev, parent);
 	if (ret)
 		return ret;
diff --git a/drivers/dahdi/dahdi-sysfs.c b/drivers/dahdi/dahdi-sysfs.c
index fea0cc1..7cd26e3 100644
--- a/drivers/dahdi/dahdi-sysfs.c
+++ b/drivers/dahdi/dahdi-sysfs.c
@@ -677,6 +677,19 @@ dahdi_spantype_store(struct device *dev, struct device_attribute *attr,
 	return (ret < 0) ? ret : count;
 }
 
+static ssize_t
+dahdi_registration_time_show(struct device *dev,
+		    struct device_attribute *attr, char *buf)
+{
+	struct dahdi_device *ddev = to_ddev(dev);
+	int count = 0;
+
+	count += sprintf(buf, "%010ld.%09ld\n",
+		ddev->registration_time.tv_sec,
+		ddev->registration_time.tv_nsec);
+	return count;
+}
+
 static struct device_attribute dahdi_device_attrs[] = {
 	__ATTR(manufacturer, S_IRUGO, dahdi_device_manufacturer_show, NULL),
 	__ATTR(type, S_IRUGO, dahdi_device_type_show, NULL),
@@ -688,6 +701,7 @@ static struct device_attribute dahdi_device_attrs[] = {
 	__ATTR(unassign_span, S_IWUSR, NULL, dahdi_device_unassign_span),
 	__ATTR(spantype, S_IWUSR | S_IRUGO, dahdi_spantype_show,
 	       dahdi_spantype_store),
+	__ATTR(registration_time, S_IRUGO, dahdi_registration_time_show, NULL),
 	__ATTR_NULL,
 };
 
diff --git a/include/dahdi/kernel.h b/include/dahdi/kernel.h
index eef65a9..dabd123 100644
--- a/include/dahdi/kernel.h
+++ b/include/dahdi/kernel.h
@@ -941,6 +941,7 @@ struct dahdi_device {
 	const char *devicetype;
 	struct device dev;
 	unsigned int irqmisses;
+	struct timespec registration_time;
 };
 
 struct dahdi_span {