[RFC,v1,1/3] clk: abstract parent cache

Commit Message

James Hogan March 22, 2013, 3:43 p.m. UTC

Abstract access to the clock parent cache by defining
__clk_get_parent_by_index(clk, index). This allows access to parent
clocks from clock drivers.

Signed-off-by: James Hogan <[e-mail]>
---
 drivers/clk/clk.c            | 21 ++++++++++++++-------
 include/linux/clk-provider.h |  1 +
 2 files changed, 15 insertions(+), 7 deletions(-)

Patch

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index ed87b24..79d5deb 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -415,6 +415,19 @@  struct clk *__clk_get_parent(struct clk *clk)
 	return !clk ? NULL : clk->parent;
 }
 
+struct clk *__clk_get_parent_by_index(struct clk *clk, u8 index)
+{
+	if (!clk || index >= clk->num_parents)
+		return NULL;
+	else if (!clk->parents)
+		return __clk_lookup(clk->parent_names[index]);
+	else if (!clk->parents[index])
+		return clk->parents[index] =
+			__clk_lookup(clk->parent_names[index]);
+	else
+		return clk->parents[index];
+}
+
 unsigned int __clk_get_enable_count(struct clk *clk)
 {
 	return !clk ? 0 : clk->enable_count;
@@ -1150,13 +1163,7 @@  static struct clk *__clk_init_parent(struct clk *clk)
 			kzalloc((sizeof(struct clk*) * clk->num_parents),
 					GFP_KERNEL);
 
-	if (!clk->parents)
-		ret = __clk_lookup(clk->parent_names[index]);
-	else if (!clk->parents[index])
-		ret = clk->parents[index] =
-			__clk_lookup(clk->parent_names[index]);
-	else
-		ret = clk->parents[index];
+	ret = __clk_get_parent_by_index(clk, index);
 
 out:
 	return ret;
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 7f197d7..4e0b634 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -347,6 +347,7 @@  const char *__clk_get_name(struct clk *clk);
 struct clk_hw *__clk_get_hw(struct clk *clk);
 u8 __clk_get_num_parents(struct clk *clk);
 struct clk *__clk_get_parent(struct clk *clk);
+struct clk *__clk_get_parent_by_index(struct clk *clk, u8 index);
 unsigned int __clk_get_enable_count(struct clk *clk);
 unsigned int __clk_get_prepare_count(struct clk *clk);
 unsigned long __clk_get_rate(struct clk *clk);