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authorSowjanya Komatineni <skomatineni@nvidia.com>2019-08-16 12:41:52 -0700
committerThierry Reding <treding@nvidia.com>2019-11-11 13:59:35 +0100
commitd9b86cc48283112f06738d45031b88bd3f9ecb92 (patch)
treeeeb57670a444e3530d37377db2b4583fb33bd241 /drivers/clk/clk.c
parent54ecb8f7028c5eb3d740bb82b0f1d90f2df63c5c (diff)
clk: Add API to get index of the clock parent
This patch adds a new clk_hw_get_parent_index() function that can be used to retrieve the index of a given clock's parent. This can be useful for restoring a clock on system resume. Reviewed-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/clk/clk.c')
-rw-r--r--drivers/clk/clk.c18
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.
*/