Add pinmux definitions for SSI3/SSI4 audio interface on RZ/G3E SMARC SoM:

- sound_clk_pins: AUDIO_CLKB and AUDIO_CLKC clock outputs
- sound_pins: SSI3_SCK, SSI3_WS, SSI3_SDATA (playback) and
  SSI4_SDATA (capture)

Signed-off-by: John Madieu <john.madieu.xa@bp.renesas.com>
---
 arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi b/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
index 6fc6d5283eae..d740e993a7d3 100644
--- a/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
+++ b/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
@@ -344,6 +344,18 @@ sd2-pwen {
 		};
 	};
 
+	sound_clk_pins: sound_clk {
+		pinmux = <RZG3E_PORT_PINMUX(4, 2, 8)>, /* AUDIO_CLKB */
+			 <RZG3E_PORT_PINMUX(4, 3, 8)>; /* AUDIO_CLKC */
+	};
+
+	sound_pins: sound {
+		pinmux = <RZG3E_PORT_PINMUX(0, 3, 9)>, /* SSI3_SCK */
+			 <RZG3E_PORT_PINMUX(0, 4, 9)>, /* SSI3_WS */
+			 <RZG3E_PORT_PINMUX(0, 2, 9)>, /* SSI3_SDATA */
+			 <RZG3E_PORT_PINMUX(0, 5, 9)>; /* SSI4_SDATA */
+	};
+
 	xspi_pins: xspi0 {
 		pinmux = <RZG3E_PORT_PINMUX(M, 0, 0)>, /* XSPI0_IO0 */
 			 <RZG3E_PORT_PINMUX(M, 1, 0)>, /* XSPI0_IO1 */
-- 
2.25.1