drivers/power/pm_activity.c: Add pm_staycount API for get stay numbers. This function is currently not used and a waste of FLASH space.

drivers/power/pm_activity.c

@@ -222,4 +222,34 @@ void pm_relax(int domain, enum pm_state_e state)
   leave_critical_section(flags);
 }
 
+/****************************************************************************
+ * Name: pm_staycount
+ *
+ * Description:
+ *   This function is called to get current stay count.
+ *
+ * Input Parameters:
+ *   domain - The domain of the PM activity
+ *   state - The state want to relax.
+ *
+ * Returned Value:
+ *   Current pm stay count
+ *
+ * Assumptions:
+ *   This function may be called from an interrupt handler.
+ *
+ ****************************************************************************/
+
+uint32_t pm_staycount(int domain, enum pm_state_e state)
+{
+  FAR struct pm_domain_s *pdom;
+
+  /* Get a convenience pointer to minimize all of the indexing */
+
+  DEBUGASSERT(domain >= 0 && domain < CONFIG_PM_NDOMAINS);
+  pdom = &g_pmglobals.domain[domain];
+
+  return pdom->stay[state];
+}
+
 #endif /* CONFIG_PM */

include/nuttx/power/pm.h

@@ -491,6 +491,26 @@ void pm_stay(int domain, enum pm_state_e state);
 
 void pm_relax(int domain, enum pm_state_e state);
 
+/****************************************************************************
+ * Name: pm_staycount
+ *
+ * Description:
+ *   This function is called to get current stay count.
+ *
+ * Input Parameters:
+ *   domain - The domain of the PM activity
+ *   state - The state want to relax.
+ *
+ * Returned Value:
+ *   Current pm stay count
+ *
+ * Assumptions:
+ *   This function may be called from an interrupt handler.
+ *
+ ****************************************************************************/
+
+uint32_t pm_staycount(int domain, enum pm_state_e state);
+
 /****************************************************************************
  * Name: pm_checkstate
  *