diff --git a/include/sound/soc.h b/include/sound/soc.h
index 13b117a..0d7718f9 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -230,6 +230,7 @@
 /* Utility functions to get clock rates from various things */
 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots);
 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params);
+int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots);
 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *parms);
 
 /* set runtime hw params */