arm64: dts: renesas: rzg2l-smarc: Enable SCIF2 on carrier board

SCIF2 interface is available on PMOD1 connector (CN7) on carrier board,
This patch adds pinmux and scif2 node to carrier board dtsi file.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20211103195600.23964-4-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/rzg2l-smarc.dtsi

@@ -21,9 +21,13 @@
  *
  */
 
+/* comment the #define statement to disable SCIF2 (SER0) on PMOD1 (CN7) */
+#define PMOD1_SER0	1
+
 / {
 	aliases {
 		serial0 = &scif0;
+		serial1 = &scif2;
 		i2c0 = &i2c0;
 		i2c1 = &i2c1;
 		i2c3 = &i2c3;
@@ -208,6 +212,13 @@ scif0_pins: scif0 {
 			 <RZG2L_PORT_PINMUX(38, 1, 1)>;	/* RxD */
 	};
 
+	scif2_pins: scif2 {
+		pinmux = <RZG2L_PORT_PINMUX(48, 0, 1)>, /* TxD */
+			 <RZG2L_PORT_PINMUX(48, 1, 1)>, /* RxD */
+			 <RZG2L_PORT_PINMUX(48, 3, 1)>, /* CTS# */
+			 <RZG2L_PORT_PINMUX(48, 4, 1)>; /* RTS# */
+	};
+
 	sd1-pwr-en-hog {
 		gpio-hog;
 		gpios = <RZG2L_GPIO(39, 2) GPIO_ACTIVE_HIGH>;
@@ -277,6 +288,23 @@ &scif0 {
 	status = "okay";
 };
 
+/*
+ * To enable SCIF2 (SER0) on PMOD1 (CN7)
+ * SW1 should be at position 2->3 so that SER0_CTS# line is activated
+ * SW2 should be at position 2->3 so that SER0_TX line is activated
+ * SW3 should be at position 2->3 so that SER0_RX line is activated
+ * SW4 should be at position 2->3 so that SER0_RTS# line is activated
+ */
+#if PMOD1_SER0
+&scif2 {
+	pinctrl-0 = <&scif2_pins>;
+	pinctrl-names = "default";
+
+	uart-has-rtscts;
+	status = "okay";
+};
+#endif
+
 &sdhi1 {
 	pinctrl-0 = <&sdhi1_pins>;
 	pinctrl-1 = <&sdhi1_pins_uhs>;