The function prototypes that are defined in the header most likely has to be marked as static inline. This helps avoiding the compiler warnings:

include/mux.h:120:14: warning: no previous prototype for ‘mux_control_states’ [-Wmissing-prototypes] include/mux.h:125:18: warning: no previous prototype for ‘mux_control_select’ [-Wmissing-prototypes] include/mux.h:133:5: warning: no previous prototype for ‘mux_control_deselect’ [-Wmissing-prototypes] include/mux.h:138:21: warning: no previous prototype for ‘mux_control_get’ [-Wmissing-prototypes] include/mux.h:143:6: warning: no previous prototype for ‘mux_control_put’ [-Wmissing-prototypes] include/mux.h:147:21: warning: no previous prototype for ‘devm_mux_control_get’ [-Wmissing-prototypes] include/mux.h:153:5: warning: no previous prototype for ‘dm_mux_init’ [-Wmissing-prototype ]

Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com --- include/mux.h | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/include/mux.h b/include/mux.h index e5deaba66f44..cbb1c331db83 100644 --- a/include/mux.h +++ b/include/mux.h @@ -117,40 +117,40 @@ struct mux_control *devm_mux_control_get(struct udevice *dev, int dm_mux_init(void);

#else -unsigned int mux_control_states(struct mux_control *mux) +static inline unsigned int mux_control_states(struct mux_control *mux) { return -ENOSYS; }

-int __must_check mux_control_select(struct mux_control *mux, - unsigned int state) +static inline int __must_check mux_control_select(struct mux_control *mux, + unsigned int state) { return -ENOSYS; }

#define mux_control_try_select(mux, state) mux_control_select(mux, state)

-int mux_control_deselect(struct mux_control *mux) +static inline int mux_control_deselect(struct mux_control *mux) { return -ENOSYS; }

-struct mux_control *mux_control_get(struct udevice *dev, const char *mux_name) +static inline struct mux_control *mux_control_get(struct udevice *dev, const char *mux_name) { return NULL; }

-void mux_control_put(struct mux_control *mux) +static inline void mux_control_put(struct mux_control *mux) { }

-struct mux_control *devm_mux_control_get(struct udevice *dev, - const char *mux_name) +static inline struct mux_control *devm_mux_control_get(struct udevice *dev, + const char *mux_name) { return NULL; }

-int dm_mux_init(void) +static inline int dm_mux_init(void) { return -ENOSYS; }