This patch adds an API clk_hw_get_parent_index to get index of the
clock parent to use during the clock restore operations on system
resume.
Signed-off-by: Sowjanya Komatineni <skomatineni@xxxxxxxxxx>
---
drivers/clk/clk.c | 17 +++++++++++++++++
include/linux/clk-provider.h | 1 +
2 files changed, 18 insertions(+)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index c0990703ce54..f26252e48f73 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1643,6 +1643,23 @@ static int clk_fetch_parent_index(struct clk_core *core,
return i;
}
+/**
+ * clk_hw_get_parent_index - return the index of parent clock
+ * @hw: clk_hw associated with the clk being consumed
+ * @parent_hw: clk_hw associated with the parent of clk
+ *
+ * Fetches and returns the index of parent clock.
+ * if hw or parent_hw is NULL, returns -EINVAL.
+ */
+int clk_hw_get_parent_index(struct clk_hw *hw, struct clk_hw *parent_hw)
+{
+ if (!hw || !parent_hw)
+ return -EINVAL;
+
+ return clk_fetch_parent_index(hw->core, parent_hw->core);
+}
+EXPORT_SYMBOL_GPL(clk_hw_get_parent_index);
+
/*
* Update the orphan status of @core and all its children.
*/
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 2ae7604783dd..477112946dd2 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -817,6 +817,7 @@ unsigned int clk_hw_get_num_parents(const struct clk_hw *hw);
struct clk_hw *clk_hw_get_parent(const struct clk_hw *hw);
struct clk_hw *clk_hw_get_parent_by_index(const struct clk_hw *hw,
unsigned int index);
+int clk_hw_get_parent_index(struct clk_hw *hw, struct clk_hw *parent_hw);
unsigned int __clk_get_enable_count(struct clk *clk);
unsigned long clk_hw_get_rate(const struct clk_hw *hw);
unsigned long __clk_get_flags(struct clk *clk);
--
2.7.4
