Merge tag 'tegra-for-5.5-clk-core-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into clk-hw-parent-index

Pull clk framework change from Thierry Reding:

Contains a single core API addition that allows clock providers to query
the parent index for a given struct clk_hw. This is used to implement
suspend/resume support on Tegra SoCs.

* tag 'tegra-for-5.5-clk-core-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
  clk: Add API to get index of the clock parent

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 1c677d7f7f53..f8ed6e613436 100644
--- 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.
  */