boards: ti: lp_em_cc2340r5: Add UART support

Enable UART.

Signed-off-by: Lars Thalian Morstad <l-morstad@ti.com>
Signed-off-by: Vebjorn Myklebust <v.myklebust@ti.com>
Signed-off-by: Stoyan Bogdanov <sbogdanov@baylibre.com>
Signed-off-by: Julien Panis <jpanis@baylibre.com>

Author: bogdanovs

boards/ti/lp_em_cc2340r5/lp_em_cc2340r5-pinctrl.dtsi

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2024 Texas Instruments Incorporated
+ * Copyright (c) 2024 BayLibre, SAS
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pinctrl/cc23x0-pinctrl.h>
+
+&pinctrl {
+	/* UART0 */
+	uart0_tx_default: uart0_tx_default {
+		pinmux = <20 DIO20_UART0_TXD>;
+		bias-disable;
+	};
+	uart0_rx_default: uart0_rx_default {
+		pinmux = <22 DIO22_UART0_RXD>;
+		bias-disable;
+		input-enable;
+	};
+};

boards/ti/lp_em_cc2340r5/lp_em_cc2340r5.dts

@@ -9,6 +9,7 @@
 
 #include <ti/cc2340r5.dtsi>
 #include "boosterpack_connector.dtsi"
+#include "lp_em_cc2340r5-pinctrl.dtsi"
 #include <zephyr/dt-bindings/gpio/gpio.h>
 #include <zephyr/dt-bindings/input/input-event-codes.h>
 
@@ -20,6 +21,8 @@
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
 		zephyr,code-partition = &slot0_partition;
+		zephyr,console = &uart0;
+		zephyr,shell-uart = &uart0;
 	};
 
 	aliases {
@@ -63,3 +66,10 @@
 &gpio0 {
 	status = "okay";
 };
+
+&uart0 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&uart0_rx_default &uart0_tx_default>;
+	pinctrl-names = "default";
+};