clk: Add support to set custom flags with clk_set_flags

The new API clk_set_flags could be used by hardware specific clock drivers
or clients for specific hardware requirements. These flags could be custom
defined as per hardware needs.

Change-Id: Ia67373ee2b8934c898052c68338fa86cb16070dd
Signed-off-by: Taniya Das <tdas@codeaurora.org>

drivers/clk/clk.c

@@ -1955,6 +1955,18 @@ bool clk_is_match(const struct clk *p, const struct clk *q)
 }
 EXPORT_SYMBOL_GPL(clk_is_match);
 
+int clk_set_flags(struct clk *clk, unsigned long flags)
+{
+	if (!clk)
+		return 0;
+
+	if (!clk->core->ops->set_flags)
+		return -EINVAL;
+
+	return clk->core->ops->set_flags(clk->core->hw, flags);
+}
+EXPORT_SYMBOL_GPL(clk_set_flags);
+
 /***        debugfs support        ***/
 
 #ifdef CONFIG_DEBUG_FS

include/linux/clk-provider.h

@@ -173,6 +173,8 @@ struct clk_rate_request {
  *		directory is provided as an argument.  Called with
  *		prepare_lock held.  Returns 0 on success, -EERROR otherwise.
  *
+ * @set_flags: Set custom flags which deals with hardware specifics. Returns 0
+ *	       on success, -EEROR otherwise.
  *
  * The clk_enable/clk_disable and clk_prepare/clk_unprepare pairs allow
  * implementations to split any work between atomic (enable) and sleepable
@@ -213,6 +215,7 @@ struct clk_ops {
 	int		(*set_phase)(struct clk_hw *hw, int degrees);
 	void		(*init)(struct clk_hw *hw);
 	int		(*debug_init)(struct clk_hw *hw, struct dentry *dentry);
+	int		(*set_flags)(struct clk_hw *hw, unsigned flags);
 };
 
 /**

include/linux/clk.h

@@ -408,6 +408,16 @@ struct clk *clk_get_parent(struct clk *clk);
  */
 struct clk *clk_get_sys(const char *dev_id, const char *con_id);
 
+/**
+ * clk_set_flags - set the custom specific flags for this clock
+ * @clk: clock source
+ * @flags: custom flags which would be hardware specific, defined for specific
+ *	   hardware.
+ *
+ * Returns success 0 or negative errno.
+ */
+int clk_set_flags(struct clk *clk, unsigned long flags);
+
 #else /* !CONFIG_HAVE_CLK */
 
 static inline struct clk *clk_get(struct device *dev, const char *id)