From 32075ef9d8a80ca07807f057d98d211f8992d0db Mon Sep 17 00:00:00 2001
From: ligd <liguiding@pinecone.net>
Date: Sun, 27 Jan 2019 11:19:26 -0600
Subject: [PATCH] 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 | 30 ++++++++++++++++++++++++++++++
 include/nuttx/power/pm.h    | 20 ++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/drivers/power/pm_activity.c b/drivers/power/pm_activity.c
index 806be27382..9e2f2a0512 100644
--- a/drivers/power/pm_activity.c
+++ b/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 */
diff --git a/include/nuttx/power/pm.h b/include/nuttx/power/pm.h
index 0928264ba8..dc670d7f04 100644
--- a/include/nuttx/power/pm.h
+++ b/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
  *