imx: add clk_get_usecount()

Signed-off-by: Eric Miao <eric.miao@linaro.org>

2 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm/plat-mxc/clock.c b/arch/arm/plat-mxc/clock.c
index cf04908ec84..5643be65e46 100644
--- a/arch/arm/plat-mxc/clock.c
+++ b/arch/arm/plat-mxc/clock.c
@@ -112,6 +112,24 @@ void clk_disable(struct clk *clk)
 }
 EXPORT_SYMBOL(clk_disable);
 
+/*!
+ * @brief Function to get the usage count for the requested clock.
+ *
+ * This function returns the reference count for the clock.
+ *
+ * @param clk 	Handle to clock to disable.
+ *
+ * @return Returns the usage count for the requested clock.
+ */
+int clk_get_usecount(struct clk *clk)
+{
+	if (clk == NULL || IS_ERR(clk))
+		return 0;
+
+	return clk->usecount;
+}
+EXPORT_SYMBOL(clk_get_usecount);
+
 /* Retrieve the *current* clock rate. If the clock itself
  * does not provide a special calculation routine, ask
  * its parent and so on, until one is able to return
diff --git a/arch/arm/plat-mxc/include/mach/clock.h b/arch/arm/plat-mxc/include/mach/clock.h
index 2b4bb90a29c..fdf3b1d2fe0 100644
--- a/arch/arm/plat-mxc/include/mach/clock.h
+++ b/arch/arm/plat-mxc/include/mach/clock.h
@@ -62,6 +62,8 @@ struct clk {
 	int (*set_parent) (struct clk *, struct clk *);
 };
 
+int clk_get_usecount(struct clk *clk);
+
 int clk_register(struct clk *clk);
 void clk_unregister(struct clk *clk);