clk: Add API to get index of the clock parent

[mirror_ubuntu-hirsute-kernel.git] / drivers / clk / clk.c

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 1c677d7f7f530739ef2dd91428697d308dee3349..f8ed6e613436973f56284c1cbb10b801c00e8136 100644 (file)
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1674,6 +1674,24 @@ static int clk_fetch_parent_index(struct clk_core *core,
        return i;
 }
 
+/**
+ * clk_hw_get_parent_index - return the index of the parent clock
+ * @hw: clk_hw associated with the clk being consumed
+ *
+ * Fetches and returns the index of parent clock. Returns -EINVAL if the given
+ * clock does not have a current parent.
+ */
+int clk_hw_get_parent_index(struct clk_hw *hw)
+{
+       struct clk_hw *parent = clk_hw_get_parent(hw);
+
+       if (WARN_ON(parent == NULL))
+               return -EINVAL;
+
+       return clk_fetch_parent_index(hw->core, parent->core);
+}
+EXPORT_SYMBOL_GPL(clk_hw_get_parent_index);
+
 /*
  * Update the orphan status of @core and all its children.
  */