clk: Introduce optional unprepare_unused callback

An unprepare_unused callback is introduced due to the same reasons to
why the disable_unused callback was added.

During the clk_disable_unused sequence, those clk_hw that needs specific
treatment with regards to being unprepared, shall implement the
unprepare_unused callback.

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>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index c0141f3e1109..253792a46c08 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -352,9 +352,12 @@ static void clk_unprepare_unused_subtree(struct clk *clk)
         if (clk->flags & CLK_IGNORE_UNUSED)
                 return;
 
-        if (__clk_is_prepared(clk))
-                if (clk->ops->unprepare)
+        if (__clk_is_prepared(clk)) {
+                if (clk->ops->unprepare_unused)
+                        clk->ops->unprepare_unused(clk->hw);
+                else if (clk->ops->unprepare)
                         clk->ops->unprepare(clk->hw);
+        }
 }
 
 /* caller must hold prepare_lock */