of_clk_is_provider() checks if a device_node has already been added to
the clk provider list. This can be used to avoid adding the same clock
provider twice.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.riba...@gmail.com>
---
 drivers/clk/clk.c            | 20 ++++++++++++++++++++
 include/linux/clk-provider.h |  5 +++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d584004f7af7..2423c6373906 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3120,6 +3120,26 @@ __of_clk_get_hw_from_provider(struct of_clk_provider 
*provider,
        return hw;
 }
 
+/**
+ * of_clk_is_provider() - Reports if a device node is already a clk provider
+ * @np: Device node pointer under test
+ */
+bool of_clk_is_provider(struct device_node *np)
+{
+       struct of_clk_provider *cp;
+
+       mutex_lock(&of_clk_mutex);
+       list_for_each_entry(cp, &of_clk_providers, link) {
+               if (cp->node == np) {
+                       mutex_unlock(&of_clk_mutex);
+                       return true;
+               }
+       }
+       mutex_unlock(&of_clk_mutex);
+       return false;
+}
+EXPORT_SYMBOL_GPL(of_clk_is_provider);
+
 struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec,
                                       const char *dev_id, const char *con_id)
 {
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index fb39d5add173..a01b18797418 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -787,6 +787,7 @@ int of_clk_add_hw_provider(struct device_node *np,
                                                 void *data),
                           void *data);
 void of_clk_del_provider(struct device_node *np);
+bool of_clk_is_provider(struct device_node *np);
 struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
                                  void *data);
 struct clk_hw *of_clk_hw_simple_get(struct of_phandle_args *clkspec,
@@ -819,6 +820,10 @@ static inline int of_clk_add_hw_provider(struct 
device_node *np,
        return 0;
 }
 static inline void of_clk_del_provider(struct device_node *np) {}
+static inline bool of_clk_is_provider(struct device_node *np)
+{
+       return false;
+}
 static inline struct clk *of_clk_src_simple_get(
        struct of_phandle_args *clkspec, void *data)
 {
-- 
2.8.1

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