This is the inverse operation to clk_get_parent_index and is already
implemented inline in clk_get_parent. Factor that code out for use by
the incoming STM32MP13 clock driver.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
drivers/clk/clk.c | 25 +++++++++++++++++++++----
include/linux/clk.h | 1 +
2 files changed, 22 insertions(+), 4 deletions(-)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 25d32e9e12f9..acd90e6e5889 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -318,6 +318,26 @@ int clk_hw_set_parent(struct clk_hw *hw, struct clk_hw *newparent)
return clk_set_parent(&hw->clk, &newparent->clk);
}
+static struct clk *clk_get_parent_by_index(struct clk *clk, u8 idx)
+{
+ if (IS_ERR_OR_NULL(clk->parents[idx]))
+ clk->parents[idx] = clk_lookup(clk->parent_names[idx]);
+
+ return clk->parents[idx];
+}
+
+struct clk_hw *
+clk_hw_get_parent_by_index(const struct clk_hw *hw, unsigned int idx)
+{
+ struct clk *clk = clk_hw_to_clk(hw);
+
+ if (!clk || idx >= clk->num_parents || !clk->parents)
+ return NULL;
+
+ return clk_to_clk_hw(clk_get_parent_by_index(clk, idx));
+}
+EXPORT_SYMBOL_GPL(clk_hw_get_parent_by_index);
+
struct clk *clk_get_parent(struct clk *clk)
{
struct clk_hw *hw;
@@ -343,10 +363,7 @@ struct clk *clk_get_parent(struct clk *clk)
idx = 0;
}
- if (IS_ERR_OR_NULL(clk->parents[idx]))
- clk->parents[idx] = clk_lookup(clk->parent_names[idx]);
-
- return clk->parents[idx];
+ return clk_get_parent_by_index(clk, idx);
}
struct clk_hw *clk_hw_get_parent(struct clk_hw *hw)
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 269664b0ba63..6a33f28ee60a 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -129,6 +129,7 @@ int clk_hw_set_rate(struct clk_hw *hw, unsigned long rate);
*/
int clk_set_parent(struct clk *clk, struct clk *parent);
int clk_hw_set_parent(struct clk_hw *hw, struct clk_hw *hwp);
+struct clk_hw *clk_hw_get_parent_by_index(const struct clk_hw *hw, unsigned int idx);
/**
* clk_get_parent - get the parent clock source for this clock
--
2.39.2
