[PATCH 1/3] clk: Add new function of_clk_is_provider()

From: Ricardo Ribalda Delgado
Date: Wed Jun 08 2016 - 06:23:54 EST


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.ribalda@xxxxxxxxx>
---
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