clk: Unprepare the unused prepared slow clocks at late init
The unused ungated fast clocks are already being disabled from
clk_disable_unused at late init. This patch extend this sequence
to the slow unused prepared clocks to be unprepared.
Unless the optional .is_prepared callback is implemented by a
clk_hw the clk_disable_unused sequence will not unprepare any
unused clocks, since it will fall back to use the software
prepare counter.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
[mturquette@linaro.org: fixed hlist accessors per b67bfe0d]
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 7571b50..c0141f3 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -336,6 +336,28 @@
#endif
/* caller must hold prepare_lock */
+static void clk_unprepare_unused_subtree(struct clk *clk)
+{
+ struct clk *child;
+
+ if (!clk)
+ return;
+
+ hlist_for_each_entry(child, &clk->children, child_node)
+ clk_unprepare_unused_subtree(child);
+
+ if (clk->prepare_count)
+ return;
+
+ if (clk->flags & CLK_IGNORE_UNUSED)
+ return;
+
+ if (__clk_is_prepared(clk))
+ if (clk->ops->unprepare)
+ clk->ops->unprepare(clk->hw);
+}
+
+/* caller must hold prepare_lock */
static void clk_disable_unused_subtree(struct clk *clk)
{
struct clk *child;
@@ -386,6 +408,12 @@
hlist_for_each_entry(clk, &clk_orphan_list, child_node)
clk_disable_unused_subtree(clk);
+ hlist_for_each_entry(clk, &clk_root_list, child_node)
+ clk_unprepare_unused_subtree(clk);
+
+ hlist_for_each_entry(clk, &clk_orphan_list, child_node)
+ clk_unprepare_unused_subtree(clk);
+
mutex_unlock(&prepare_lock);
return 0;