linux-kernel - [PATCH v3 01/18] clk: introduce clk_hw_get_index_of

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Date:   Sun, 20 Mar 2022 12:34:13 +0100
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Rob Herring <robh+dt@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Ansuel Smith <ansuelsmth@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org
Subject: [PATCH v3 01/18] clk: introduce clk_hw_get_index_of_parent new API

Clk can have multiple parents. Some clk may require to get the cached
index of other parent that are not current associated with the clk.
We have clk_hw_get_parent_index() that returns the index of the current
parent but we can't get the index of other parents of the provided clk.
Introduce clk_hw_get_index_of_parent() to get the cached index of the
parent of the provided clk. This permits a direct access of the internal
clk_fetch_parent_index().

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 drivers/clk/clk.c            | 14 ++++++++++++++
 include/linux/clk-provider.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 8de6a22498e7..bdd70a88394c 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1726,6 +1726,20 @@ int clk_hw_get_parent_index(struct clk_hw *hw)
 }
 EXPORT_SYMBOL_GPL(clk_hw_get_parent_index);
 
+/**
+ * clk_hw_get_index_of_parent - return the index of the parent clock
+ * @hw: clk_hw associated with the clk being consumed
+ * @parent: clk_hw of the parent to be fetched the index of
+ *
+ * Fetches and returns the index of parent clock provided.
+ * Returns -EINVAL if the given parent index can't be provided.
+ */
+int clk_hw_get_index_of_parent(struct clk_hw *hw, const struct clk_hw *parent)
+{
+	return clk_fetch_parent_index(hw->core, parent->core);
+}
+EXPORT_SYMBOL_GPL(clk_hw_get_index_of_parent);
+
 /*
  * 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 2faa6f7aa8a8..5708c0b3ef1c 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -1198,6 +1198,7 @@ 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_index_of_parent(struct clk_hw *hw, const struct clk_hw *parent);
 int clk_hw_get_parent_index(struct clk_hw *hw);
 int clk_hw_set_parent(struct clk_hw *hw, struct clk_hw *new_parent);
 unsigned int __clk_get_enable_count(struct clk *clk);
-- 
2.34.1