diff --git a/sound/soc/sh/rcar/core.c b/sound/soc/sh/rcar/core.c
index b4c25d661e3d9020f20d8357df4fff3b66871729..487ddf78b8ee9c0930e7cac97725f05efcaabd71 100644
--- a/sound/soc/sh/rcar/core.c
+++ b/sound/soc/sh/rcar/core.c
@@ -479,16 +479,6 @@ static void rsnd_dai_disconnect(struct rsnd_mod *mod,
 	io->mod[mod->type] = NULL;
 }
 
-int rsnd_dai_id(struct rsnd_priv *priv, struct rsnd_dai *rdai)
-{
-	int id = rdai - priv->rdai;
-
-	if ((id < 0) || (id >= rsnd_rdai_nr(priv)))
-		return -EINVAL;
-
-	return id;
-}
-
 struct rsnd_dai *rsnd_rdai_get(struct rsnd_priv *priv, int id)
 {
 	if ((id < 0) || (id >= rsnd_rdai_nr(priv)))
diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h
index 749b9779dd1e0f861ab849932ad655369e6b58b8..28a06fce794ea2c4d23de232029445398043750d 100644
--- a/sound/soc/sh/rcar/rsnd.h
+++ b/sound/soc/sh/rcar/rsnd.h
@@ -317,7 +317,6 @@ struct rsnd_dai {
 struct rsnd_dai *rsnd_rdai_get(struct rsnd_priv *priv, int id);
 
 int rsnd_dai_is_play(struct rsnd_dai *rdai, struct rsnd_dai_stream *io);
-int rsnd_dai_id(struct rsnd_priv *priv, struct rsnd_dai *rdai);
 #define rsnd_dai_get_platform_info(rdai) ((rdai)->info)
 
 void rsnd_dai_pointer_update(struct rsnd_dai_stream *io, int cnt);