clk: Add common __clk_get(), __clk_put() implementations

This patch adds common __clk_get(), __clk_put() clkdev helpers which
replace their platform specific counterparts when the common clock
API is enabled.

The owner module pointer field is added to struct clk so a reference
to the clock supplier module can be taken by the clock consumers.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
Changes since v5:
 - none.

Changes since v4:
 - dropped unnecessary struct module forward declaration from
   clk-provider.h

Changes since v3:
 - dropped exporting of __clk_get(), __clk_put().

Changes since v2:
 - fixed handling of NULL clock pointers in __clk_get(), __clk_put();

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 8f56e3d80a3..05a60cf6e27 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1857,6 +1857,26 @@ void devm_clk_unregister(struct device *dev, struct clk *clk)
 }
 EXPORT_SYMBOL_GPL(devm_clk_unregister);
 
+/*
+ * clkdev helpers
+ */
+int __clk_get(struct clk *clk)
+{
+	if (clk && !try_module_get(clk->owner))
+		return 0;
+
+	return 1;
+}
+
+void __clk_put(struct clk *clk)
+{
+	if (WARN_ON_ONCE(IS_ERR(clk)))
+		return;
+
+	if (clk)
+		module_put(clk->owner);
+}
+
 /***        clk rate change notifiers        ***/
 
 /**