spi: Add a prototype for exported spi_set_cs_timing()

Compiler is not happy about spi_set_cs_timing() prototype.

drivers/spi/spi.c:3016:6: warning: no previous prototype for ‘spi_set_cs_timing’ [-Wmissing-prototypes]
 void spi_set_cs_timing(struct spi_device *spi, u8 setup, u8 hold,
      ^~~~~~~~~~~~~~~~~

Let's add it to the header.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index d0c5ba746e01..0ec11f2911af 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -980,6 +980,8 @@ static inline void spi_message_free(struct spi_message *m)
         kfree(m);
 }
 
+extern void spi_set_cs_timing(struct spi_device *spi, u8 setup, u8 hold, u8 inactive_dly);
+
 extern int spi_setup(struct spi_device *spi);
 extern int spi_async(struct spi_device *spi, struct spi_message *message);
 extern int spi_async_locked(struct spi_device *spi,