clk: abstract parent cache

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 <james.hogan@imgtec.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 14 insertions, 7 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 56a00db61332..42c15a8ba34d 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -559,6 +559,19 @@ 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;
@@ -1316,13 +1329,7 @@ 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;