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Subject[PATCH 01/13] clk: Add non CONFIG_HAVE_CLK routines
Date
Many drivers are shared between architectures that may or may not have HAVE_CLK
selected for them. To remove compilation errors for them we enclose clk_*()
calls in these drivers within #ifdef CONFIG_HAVE_CLK, #endif.

This patch removes the need of these CONFIG_HAVE_CLK statements, by introducing
dummy routines when HAVE_CLK is not selected by platforms. So, definition of
these routines will always be available. These calls will return error for
platforms that don't select HAVE_CLK.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
---
include/linux/clk.h | 160 ++++++++++++++++++++++++++++++++-------------------
1 files changed, 101 insertions(+), 59 deletions(-)
diff --git a/include/linux/clk.h b/include/linux/clk.h
index b025272..6e1c63e 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -84,23 +84,6 @@ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb);
#endif /* !CONFIG_COMMON_CLK */

/**
- * clk_get - lookup and obtain a reference to a clock producer.
- * @dev: device for clock "consumer"
- * @id: clock comsumer ID
- *
- * Returns a struct clk corresponding to the clock producer, or
- * valid IS_ERR() condition containing errno. The implementation
- * uses @dev and @id to determine the clock consumer, and thereby
- * the clock producer. (IOW, @id may be identical strings, but
- * clk_get may return different clock producers depending on @dev.)
- *
- * Drivers must assume that the clock source is not enabled.
- *
- * clk_get should not be called from within interrupt context.
- */
-struct clk *clk_get(struct device *dev, const char *id);
-
-/**
* clk_prepare - prepare a clock source
* @clk: clock source
*
@@ -119,6 +102,42 @@ static inline int clk_prepare(struct clk *clk)
#endif

/**
+ * clk_unprepare - undo preparation of a clock source
+ * @clk: clock source
+ *
+ * This undoes a previously prepared clock. The caller must balance
+ * the number of prepare and unprepare calls.
+ *
+ * Must not be called from within atomic context.
+ */
+#ifdef CONFIG_HAVE_CLK_PREPARE
+void clk_unprepare(struct clk *clk);
+#else
+static inline void clk_unprepare(struct clk *clk)
+{
+ might_sleep();
+}
+#endif
+
+#ifdef CONFIG_HAVE_CLK
+/**
+ * clk_get - lookup and obtain a reference to a clock producer.
+ * @dev: device for clock "consumer"
+ * @id: clock comsumer ID
+ *
+ * Returns a struct clk corresponding to the clock producer, or
+ * valid IS_ERR() condition containing errno. The implementation
+ * uses @dev and @id to determine the clock consumer, and thereby
+ * the clock producer. (IOW, @id may be identical strings, but
+ * clk_get may return different clock producers depending on @dev.)
+ *
+ * Drivers must assume that the clock source is not enabled.
+ *
+ * clk_get should not be called from within interrupt context.
+ */
+struct clk *clk_get(struct device *dev, const char *id);
+
+/**
* clk_enable - inform the system when the clock source should be running.
* @clk: clock source
*
@@ -146,47 +165,6 @@ int clk_enable(struct clk *clk);
*/
void clk_disable(struct clk *clk);

-
-/**
- * clk_unprepare - undo preparation of a clock source
- * @clk: clock source
- *
- * This undoes a previously prepared clock. The caller must balance
- * the number of prepare and unprepare calls.
- *
- * Must not be called from within atomic context.
- */
-#ifdef CONFIG_HAVE_CLK_PREPARE
-void clk_unprepare(struct clk *clk);
-#else
-static inline void clk_unprepare(struct clk *clk)
-{
- might_sleep();
-}
-#endif
-
-/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
-static inline int clk_prepare_enable(struct clk *clk)
-{
- int ret;
-
- ret = clk_prepare(clk);
- if (ret)
- return ret;
- ret = clk_enable(clk);
- if (ret)
- clk_unprepare(clk);
-
- return ret;
-}
-
-/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */
-static inline void clk_disable_unprepare(struct clk *clk)
-{
- clk_disable(clk);
- clk_unprepare(clk);
-}
-
/**
* clk_get_rate - obtain the current clock rate (in Hz) for a clock source.
* This is only valid once the clock source has been enabled.
@@ -206,7 +184,6 @@ unsigned long clk_get_rate(struct clk *clk);
*/
void clk_put(struct clk *clk);

-
/*
* The remaining APIs are optional for machine class support.
*/
@@ -265,6 +242,71 @@ struct clk *clk_get_parent(struct clk *clk);
*/
struct clk *clk_get_sys(const char *dev_id, const char *con_id);

+#else /* !CONFIG_HAVE_CLK */
+
+static inline struct clk *clk_get(struct device *dev, const char *id)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline void clk_put(struct clk *clk) {}
+
+static inline int clk_enable(struct clk *clk)
+{
+ return -ENODEV;
+}
+
+static inline void clk_disable(struct clk *clk) {}
+
+static inline unsigned long clk_get_rate(struct clk *clk)
+{
+ return -ENODEV;
+}
+
+static inline int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+ return -ENODEV;
+}
+
+static inline long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+ return -ENODEV;
+}
+
+static inline int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+ return -ENODEV;
+}
+
+static inline struct clk *clk_get_parent(struct clk *clk)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+#endif
+
+/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
+static inline int clk_prepare_enable(struct clk *clk)
+{
+ int ret;
+
+ ret = clk_prepare(clk);
+ if (ret)
+ return ret;
+ ret = clk_enable(clk);
+ if (ret)
+ clk_unprepare(clk);
+
+ return ret;
+}
+
+/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */
+static inline void clk_disable_unprepare(struct clk *clk)
+{
+ clk_disable(clk);
+ clk_unprepare(clk);
+}
+
/**
* clk_add_alias - add a new clock alias
* @alias: name for clock alias
--
1.7.9


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