clk: Add devm_of_clk_add_hw_provider()/del_provider() APIs

Sometimes we only have one of_clk_del_provider() call in driver
error and remove paths, because we're missing a
devm_of_clk_add_hw_provider() API. Introduce the API so we can
convert drivers to use this and potentially reduce the amount of
code needed to remove providers in drivers.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index 69f08c0..c180045 100644 (file)
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -237,6 +237,7 @@ CLOCK
   devm_clk_get()
   devm_clk_put()
   devm_clk_hw_register()
+  devm_of_clk_add_hw_provider()
 
 DMA
   dmam_alloc_coherent()

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index c8d83ac..856d485 100644 (file)
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3177,6 +3177,37 @@ int of_clk_add_hw_provider(struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(of_clk_add_hw_provider);
 
+static void devm_of_clk_release_provider(struct device *dev, void *res)
+{
+       of_clk_del_provider(*(struct device_node **)res);
+}
+
+int devm_of_clk_add_hw_provider(struct device *dev,
+                       struct clk_hw *(*get)(struct of_phandle_args *clkspec,
+                                             void *data),
+                       void *data)
+{
+       struct device_node **ptr, *np;
+       int ret;
+
+       ptr = devres_alloc(devm_of_clk_release_provider, sizeof(*ptr),
+                          GFP_KERNEL);
+       if (!ptr)
+               return -ENOMEM;
+
+       np = dev->of_node;
+       ret = of_clk_add_hw_provider(np, get, data);
+       if (!ret) {
+               *ptr = np;
+               devres_add(dev, ptr);
+       } else {
+               devres_free(ptr);
+       }
+
+       return ret;
+}
+EXPORT_SYMBOL_GPL(devm_of_clk_add_hw_provider);
+
 /**
  * of_clk_del_provider() - Remove a previously registered clock provider
  * @np: Device node pointer associated with clock provider
@@ -3198,6 +3229,27 @@ void of_clk_del_provider(struct device_node *np)
 }
 EXPORT_SYMBOL_GPL(of_clk_del_provider);
 
+static int devm_clk_provider_match(struct device *dev, void *res, void *data)
+{
+       struct device_node **np = res;
+
+       if (WARN_ON(!np || !*np))
+               return 0;
+
+       return *np == data;
+}
+
+void devm_of_clk_del_provider(struct device *dev)
+{
+       int ret;
+
+       ret = devres_release(dev, devm_of_clk_release_provider,
+                            devm_clk_provider_match, dev->of_node);
+
+       WARN_ON(ret);
+}
+EXPORT_SYMBOL(devm_of_clk_del_provider);
+
 static struct clk_hw *
 __of_clk_get_hw_from_provider(struct of_clk_provider *provider,
                              struct of_phandle_args *clkspec)

diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 5100ec1..ba79d61 100644 (file)
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -815,7 +815,12 @@ int of_clk_add_hw_provider(struct device_node *np,
                           struct clk_hw *(*get)(struct of_phandle_args *clkspec,
                                                 void *data),
                           void *data);
+int devm_of_clk_add_hw_provider(struct device *dev,
+                          struct clk_hw *(*get)(struct of_phandle_args *clkspec,
+                                                void *data),
+                          void *data);
 void of_clk_del_provider(struct device_node *np);
+void devm_of_clk_del_provider(struct device *dev);
 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,
@@ -847,7 +852,15 @@ static inline int of_clk_add_hw_provider(struct device_node *np,
 {
        return 0;
 }
+static inline int devm_of_clk_add_hw_provider(struct device *dev,
+                          struct clk_hw *(*get)(struct of_phandle_args *clkspec,
+                                                void *data),
+                          void *data)
+{
+       return 0;
+}
 static inline void of_clk_del_provider(struct device_node *np) {}
+static inline void devm_of_clk_del_provider(struct device *dev) {}
 static inline struct clk *of_clk_src_simple_get(
        struct of_phandle_args *clkspec, void *data)
 {