[PATCH 1/2] Add a common struct clk

diff --git a/include/linux/clk.h b/include/linux/clk.h
index 1d37f42..604be74 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h

@@ -11,18 +12,168 @@

...
+#ifdef CONFIG_USE_COMMON_STRUCT_CLK
...
+#else /* !CONFIG_USE_COMMON_STRUCT_CLK */
 
 /*
- * struct clk - an machine class defined object / cookie.
+ * Global clock object, actual structure is declared per-machine
  */
 struct clk;
 
+static inline void clk_common_init(struct clk *clk) { }
+
+/*
+ * For !CONFIG_USE_COMMON_STRUCT_CLK, we don't enforce any atomicity
+ * requirements for clk_enable/clk_disable, so the prepare and unprepare
+ * functions are no-ops
+ */
+int clk_prepare(struct clk *clk) { return 0; }
+void clk_unprepare(struct clk *clk) { }