[PATCH v2 1/5] clk: introduce stub clk_sync_state()

[Brian Masney <bmasney@redhat.com>]

Add a stub clk_sync_state() since this will be needed for some clk
drivers that already have a sync_state callback. This allows introducing
all of the necessary changes into the drivers before actually adding the
real clk_sync_state() implementation. Doing it this way ensures that the
tree stays bisectable, and the individual changes are small patches.

Tested-by: Jens Glathe <jens.glathe@oldschoolsolutions.biz>
Signed-off-by: Brian Masney <bmasney@redhat.com>
---
 drivers/clk/clk.c   |  6 ++++++
 include/linux/clk.h | 14 ++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 048adfa86a5d..9cb2b42d1be4 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1557,6 +1557,12 @@ static int __init clk_disable_unused(void)
 }
 late_initcall_sync(clk_disable_unused);
 
+void clk_sync_state(struct device *dev)
+{
+	/* Will fill in */
+}
+EXPORT_SYMBOL_GPL(clk_sync_state);
+
 static int clk_core_determine_round_nolock(struct clk_core *core,
 					   struct clk_rate_request *req)
 {
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 998ba3f261da..31a0c9224c46 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -846,6 +846,20 @@ void devm_clk_put(struct device *dev, struct clk *clk);
  */
 
 
+/*
+ * clk_sync_state - sync_state callback to disable unused clocks
+ * @dev: the clock provider device whose unused clocks should be disabled
+ *
+ * It is called by the driver core once all consumers of @dev have probed,
+ * and disables any clocks belonging to @dev that are unused at that point.
+ *
+ * If a clock provider doesn't have a sync_state callback, then the framework
+ * will set up clk_sync_state() on your drivers behalf. If your driver needs
+ * a sync_state callback, then that callback also needs to call
+ * clk_sync_state().
+ */
+void clk_sync_state(struct device *dev);
+
 /**
  * clk_round_rate - adjust a rate to the exact rate a clock can provide
  * @clk: clock source

-- 
2.54.0