diff --git a/arch/arm/boot/dts/renesas/r8a7778.dtsi b/arch/arm/boot/dts/renesas/r8a7778.dtsi
index 97f71c1f69dd..b80e832c9277 100644
--- a/arch/arm/boot/dts/renesas/r8a7778.dtsi
+++ b/arch/arm/boot/dts/renesas/r8a7778.dtsi
@@ -255,6 +255,8 @@ rcar_sound: sound@ffd90000 {
 		reg =	<0xffd90000 0x1000>,	/* SRU */
 			<0xffd91000 0x240>,	/* SSI */
 			<0xfffe0000 0x24>;	/* ADG */
+		reg-names = "sru", "ssi", "adg";
+
 		clocks = <&mstp3_clks R8A7778_CLK_SSI8>,
 			<&mstp3_clks R8A7778_CLK_SSI7>,
 			<&mstp3_clks R8A7778_CLK_SSI6>,