clk: add api to get clk consumer from clk_hw

[platform/kernel/linux-starfive.git] / drivers / clk / clk.c

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index f70dc0e..48931f4 100644 (file)
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3667,6 +3667,24 @@ struct clk *clk_hw_create_clk(struct device *dev, struct clk_hw *hw,
        return clk;
 }
 
+/**
+ * clk_hw_get_clk - get clk consumer given an clk_hw
+ * @hw: clk_hw associated with the clk being consumed
+ * @con_id: connection ID string on device
+ *
+ * Returns: new clk consumer
+ * This is the function to be used by providers which need
+ * to get a consumer clk and act on the clock element
+ * Calls to this function must be balanced with calls clk_put()
+ */
+struct clk *clk_hw_get_clk(struct clk_hw *hw, const char *con_id)
+{
+       struct device *dev = hw->core->dev;
+
+       return clk_hw_create_clk(dev, hw, dev_name(dev), con_id);
+}
+EXPORT_SYMBOL(clk_hw_get_clk);
+
 static int clk_cpy_name(const char **dst_p, const char *src, bool must_exist)
 {
        const char *dst;
@@ -4187,6 +4205,49 @@ void devm_clk_hw_unregister(struct device *dev, struct clk_hw *hw)
 }
 EXPORT_SYMBOL_GPL(devm_clk_hw_unregister);
 
+static void devm_clk_release(struct device *dev, void *res)
+{
+       clk_put(*(struct clk **)res);
+}
+
+/**
+ * devm_clk_hw_get_clk - resource managed clk_hw_get_clk()
+ * @dev: device that is registering this clock
+ * @hw: clk_hw associated with the clk being consumed
+ * @con_id: connection ID string on device
+ *
+ * Managed clk_hw_get_clk(). Clocks got with this function are
+ * automatically clk_put() on driver detach. See clk_put()
+ * for more information.
+ */
+struct clk *devm_clk_hw_get_clk(struct device *dev, struct clk_hw *hw,
+                               const char *con_id)
+{
+       struct clk *clk;
+       struct clk **clkp;
+
+       /* This should not happen because it would mean we have drivers
+        * passing around clk_hw pointers instead of having the caller use
+        * proper clk_get() style APIs
+        */
+       WARN_ON_ONCE(dev != hw->core->dev);
+
+       clkp = devres_alloc(devm_clk_release, sizeof(*clkp), GFP_KERNEL);
+       if (!clkp)
+               return ERR_PTR(-ENOMEM);
+
+       clk = clk_hw_get_clk(hw, con_id);
+       if (!IS_ERR(clk)) {
+               *clkp = clk;
+               devres_add(dev, clkp);
+       } else {
+               devres_free(clkp);
+       }
+
+       return clk;
+}
+EXPORT_SYMBOL_GPL(devm_clk_hw_get_clk);
+
 /*
  * clkdev helpers
  */