diff --git a/include/sound/soc.h b/include/sound/soc.h
index c477058f..d609232 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -459,6 +459,7 @@
 	struct list_head card_list;
 	int num_dai;
 	enum snd_soc_compress_type compress_type;
+	size_t reg_size;	/* reg_cache_size * reg_word_size */
 
 	/* runtime */
 	struct snd_ac97 *ac97;  /* for ad-hoc ac97 devices */