diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h
index d5c0182c8e50..a14bc9274b3f 100644
--- a/sound/soc/sh/rcar/rsnd.h
+++ b/sound/soc/sh/rcar/rsnd.h
@@ -32,11 +32,11 @@
  */
 enum rsnd_reg {
 	/* SRU/SCU/SSIU */
-	RSND_REG_SRC_ROUTE_SEL,
-	RSND_REG_SRC_TMG_SEL0,
-	RSND_REG_SRC_TMG_SEL1,
-	RSND_REG_SRC_TMG_SEL2,
-	RSND_REG_SRC_ROUTE_CTRL,
+	RSND_REG_SRC_ROUTE_SEL,		/* for Gen1 */
+	RSND_REG_SRC_TMG_SEL0,		/* for Gen1 */
+	RSND_REG_SRC_TMG_SEL1,		/* for Gen1 */
+	RSND_REG_SRC_TMG_SEL2,		/* for Gen1 */
+	RSND_REG_SRC_ROUTE_CTRL,	/* for Gen1 */
 	RSND_REG_SSI_MODE0,
 	RSND_REG_SSI_MODE1,
 	RSND_REG_BUSIF_MODE,
diff --git a/sound/soc/sh/rcar/scu.c b/sound/soc/sh/rcar/scu.c
index 187f7dc30369..7642ec52b590 100644
--- a/sound/soc/sh/rcar/scu.c
+++ b/sound/soc/sh/rcar/scu.c
@@ -36,7 +36,8 @@ struct rsnd_scu {
 		     ((pos) = (struct rsnd_scu *)(priv)->scu + i);	\
 	     i++)
 
-static int rsnd_scu_set_route(struct rsnd_priv *priv,
+/* Gen1 only */
+static int rsnd_src_set_route_if_gen1(struct rsnd_priv *priv,
 			      struct rsnd_mod *mod,
 			      struct rsnd_dai *rdai,
 			      struct rsnd_dai_stream *io)
@@ -174,7 +175,8 @@ static int rsnd_scu_start(struct rsnd_mod *mod,
 	}
 
 	/* it use DMA transter */
-	ret = rsnd_scu_set_route(priv, mod, rdai, io);
+
+	ret = rsnd_src_set_route_if_gen1(priv, mod, rdai, io);
 	if (ret < 0)
 		return ret;