[PATCH v5 1/5] dm: clk: add stub when CONFIG_CLK is deactivated

[Patrick Delaunay]

Add stub for functions clk_...() when CONFIG_CLK is deactivated.

This patch avoids compilation issues for driver using these API
without protection (#if CONFIG_IS_ENABLED(CLK))

For example, before this patch we have undefined reference to
`clk_disable_bulk') for code:
  clk_disable_bulk(&priv->clks);
  clk_release_bulk(&priv->clks);

The bulk stub set and test bulk->count to avoid error for the sequence:

  clk_get_bulk(dev, &priv->bulk);
	....
  if (clk_enable(&priv>bulk))
	return -EIO;

Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
---

Changes in v5:
- use ERR_PTR in clk_get_parent()
- force bulk->count = 0 in clk_get_bulk to avoid issue
  for next call of clk_enable_bulk / clk_enable_bulk
- update commit message

Changes in v4:
- Add stub for all functions using 'struct clk' or 'struct clk_bulk'
  after remarks on v3

Changes in v3:
- Add stub for clk_disable_bulk

Changes in v2: None

 include/clk.h | 104 +++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 91 insertions(+), 13 deletions(-)

diff --git a/include/clk.h b/include/clk.h
index 3336301815..ca8f1cfec7 100644
--- a/include/clk.h
+++ b/include/clk.h
@@ -9,6 +9,7 @@
 #define _CLK_H_
 
 #include <dm/ofnode.h>
+#include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/types.h>
 
@@ -249,6 +250,8 @@ static inline int clk_get_by_index(struct udevice *dev, int index,
 
 static inline int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk)
 {
+	if (bulk)
+		bulk->count = 0;
 	return -ENOSYS;
 }
 
@@ -312,6 +315,7 @@ static inline int clk_release_bulk(struct clk_bulk *bulk)
 	return clk_release_all(bulk->clks, bulk->count);
 }
 
+#if CONFIG_IS_ENABLED(CLK)
 /**
  * clk_request - Request a clock by provider-specific ID.
  *
@@ -433,19 +437,6 @@ int clk_disable_bulk(struct clk_bulk *bulk);
  */
 bool clk_is_match(const struct clk *p, const struct clk *q);
 
-int soc_clk_dump(void);
-
-/**
- * clk_valid() - check if clk is valid
- *
- * @clk:	the clock to check
- * @return true if valid, or false
- */
-static inline bool clk_valid(struct clk *clk)
-{
-	return clk && !!clk->dev;
-}
-
 /**
  * clk_get_by_id() - Get the clock by its ID
  *
@@ -465,6 +456,93 @@ int clk_get_by_id(ulong id, struct clk **clkp);
  * @return true on binded, or false on no
  */
 bool clk_dev_binded(struct clk *clk);
+
+#else /* CONFIG_IS_ENABLED(CLK) */
+
+static inline int clk_request(struct udevice *dev, struct clk *clk)
+{
+	return -ENOSYS;
+}
+
+static inline int clk_free(struct clk *clk)
+{
+	return -ENOSYS;
+}
+
+static inline ulong clk_get_rate(struct clk *clk)
+{
+	return -ENOSYS;
+}
+
+static inline struct clk *clk_get_parent(struct clk *clk)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
+static inline long long clk_get_parent_rate(struct clk *clk)
+{
+	return -ENOSYS;
+}
+
+static inline ulong clk_set_rate(struct clk *clk, ulong rate)
+{
+	return -ENOSYS;
+}
+
+static inline int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+	return -ENOSYS;
+}
+
+static inline int clk_enable(struct clk *clk)
+{
+	return -ENOSYS;
+}
+
+static inline int clk_enable_bulk(struct clk_bulk *bulk)
+{
+	return bulk && bulk->count == 0 ? 0 : -ENOSYS;
+}
+
+static inline int clk_disable(struct clk *clk)
+{
+	return -ENOSYS;
+}
+
+static inline int clk_disable_bulk(struct clk_bulk *bulk)
+{
+	return bulk && bulk->count == 0 ? 0 : -ENOSYS;
+}
+
+static inline bool clk_is_match(const struct clk *p, const struct clk *q)
+{
+	return false;
+}
+
+static inline int clk_get_by_id(ulong id, struct clk **clkp)
+{
+	return -ENOSYS;
+}
+
+static inline bool clk_dev_binded(struct clk *clk)
+{
+	return false;
+}
+#endif /* CONFIG_IS_ENABLED(CLK) */
+
+/**
+ * clk_valid() - check if clk is valid
+ *
+ * @clk:	the clock to check
+ * @return true if valid, or false
+ */
+static inline bool clk_valid(struct clk *clk)
+{
+	return clk && !!clk->dev;
+}
+
+int soc_clk_dump(void);
+
 #endif
 
 #define clk_prepare_enable(clk) clk_enable(clk)
-- 
2.17.1