clock: Add a method to determine whether a clock is free running.

This will be needed by the end-to-end transparent clock code.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>

clock.c

@@ -1187,6 +1187,11 @@ void clock_follow_up_info(struct clock *c, struct follow_up_info_tlv *f)
 	       sizeof(c->status.lastGmPhaseChange));
 }
 
+int clock_free_running(struct clock *c)
+{
+	return c->free_running ? 1 : 0;
+}
+
 int clock_gm_capable(struct clock *c)
 {
 	return c->grand_master_capable;

clock.h

@@ -141,6 +141,13 @@ struct port *clock_first_port(struct clock *c);
  */
 void clock_follow_up_info(struct clock *c, struct follow_up_info_tlv *f);
 
+/**
+ * Determine if a clock is free running or not.
+ * @param c  The clock instance.
+ * @return   One if the clock is free running or zero otherwise.
+ */
+int clock_free_running(struct clock *c);
+
 /**
  * Obtain the gmCapable flag from a clock's default data set.
  * This function is specific to the 802.1AS standard.