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, 0 deletions

diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index ee946862e058..56e6cc12c796 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -49,6 +49,10 @@ struct clk_hw;
  *              This function is allowed to sleep. Optional, if this op is not
  *              set then the prepare count will be used.
  *
+ * @unprepare_unused: Unprepare the clock atomically.  Only called from
+ *              clk_disable_unused for prepare clocks with special needs.
+ *              Called with prepare mutex held. This function may sleep.
+ *
  * @enable:     Enable the clock atomically. This must not return until the
  *              clock is generating a valid clock signal, usable by consumer
  *              devices. Called with enable_lock held. This function must not
@@ -113,6 +117,7 @@ struct clk_ops {
         int             (*prepare)(struct clk_hw *hw);
         void            (*unprepare)(struct clk_hw *hw);
         int             (*is_prepared)(struct clk_hw *hw);
+        void            (*unprepare_unused)(struct clk_hw *hw);
         int             (*enable)(struct clk_hw *hw);
         void            (*disable)(struct clk_hw *hw);
         int             (*is_enabled)(struct clk_hw *hw);