clk.h: Fix shim ifdef guard (HAVE_CLK -> COMMON_CLK)

Commit 93abe8e4 (clk: add non HAVE_CLK routines) added shims for the clk code but HAVE_CLK isn't enough. It's possible to have the clk support but not enable it. We end up with full prototypes for code that is never built - causing module linking to fail later.

This patch changes the guard to use COMMON_CLK, which actually guards the code.

---
 include/linux/clk.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -120,7 +120,7 @@ static inline void clk_unprepare(struct
 }
 #endif
 
-#ifdef CONFIG_HAVE_CLK
+#ifdef CONFIG_COMMON_CLK
 /**
  * clk_get - lookup and obtain a reference to a clock producer.
  * @dev: device for clock "consumer"

@@ -276,7 +276,7 @@ struct clk *clk_get_parent(struct clk *c
  */
 struct clk *clk_get_sys(const char *dev_id, const char *con_id);
 
-#else /* !CONFIG_HAVE_CLK */
+#else /* !CONFIG_COMMON_CLK */
 
 static inline struct clk *clk_get(struct device *dev, const char *id)
 {

Jeff Mahoney
SUSE Labs

This is wrong. COMMON_CLK is an _implementation_ of the CLK API. It is not the only implementation in the kernel. Conditionalizing like this breaks existing users.

HAVE_CLK is the right thing here - if you define HAVE_CLK then you _are_ providing an implementation of clk_get() et.al. If you're not, then you do not define HAVE_CLK. Simples.

Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:

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Ok. Thanks for the feedback.

It would seem, then, that the powerpc clock implementation doesn't implement the full API and that's where we're running into problems.

Specifically, the use of clk_devm_get in drivers/usb/chipidea/ci13xxx_imx.c and drivers/char/hw_random/exynos-rng.ko is causing module link errors on powerpc configs for the EFIKA hardware. The EXYNOS RNG driver should probably have a dependency on ARCH_EXYNOS. The chipidea driver looks like it was developed on ARM hardware - does it exist anywhere else?

Should the clk_devm stuff be moved someplace generic? I don't have a horse in this race. My only interest here is to get these configs to build again. :)

- -Jeff

- --
Jeff Mahoney
SUSE Labs
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devm_clk_get() should not be in clkdev.c, but should be entirely separate, allowing anyone who is using the clk API to use it. But unfortunately, that's not how it ended up getting added... Moving it is something that's on my very long todo list.

It should still remain in drivers/clk, but it should be in a separate file, probably built conditionally by HAVE_CLK being defined.

Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of: