boards: add uart5 as console and shell-UART

Add UART5 as zephyr console and shell-UART device by default and ensure
its corresponding GPIOG node is enabled.
Add USART6 as a disabled node for potential use.
Enable UART support to the STM32MP257F-EV1 board configuration and add
the shell feature in the yaml.

Signed-off-by: Youssef Zini <youssef.zini@savoirfairelinux.com>

boards/st/stm32mp257f_ev1/stm32mp257f_ev1_stm32mp257fxx_m33.dts

@@ -14,6 +14,8 @@
 	compatible = "st,stm32mp257f-ev1", "st,stm32mp25";
 
 	chosen {
+		zephyr,console = &uart5;
+		zephyr,shell-uart = &uart5;
 		zephyr,flash = &ddr_code;
 		zephyr,sram = &ddr_sys;
 	};
@@ -54,3 +56,17 @@
 &gpioj {
 	status = "okay";
 };
+
+&uart5 {
+	pinctrl-0 = <&uart5_tx_pg9 &uart5_rx_pg10>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&usart6 {
+	pinctrl-0 = <&usart6_tx_pf13 &usart6_rx_pf14>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "disabled";
+};

boards/st/stm32mp257f_ev1/stm32mp257f_ev1_stm32mp257fxx_m33.yaml

@@ -8,6 +8,7 @@ toolchain:
 supported:
   - LED
   - gpio
+  - shell
 testing:
   ignore_tags:
     - cmsis_rtos_v2
@@ -17,7 +18,6 @@ testing:
     - crypto
     - aes
     - cmm
-    - shell
     - nfc
 ram: 8192
 flash: 8192

boards/st/stm32mp257f_ev1/stm32mp257f_ev1_stm32mp257fxx_m33_defconfig

@@ -9,3 +9,11 @@ CONFIG_GPIO=y
 
 # Enable HW stack protection
 CONFIG_HW_STACK_PROTECTION=y
+
+# Enable UART driver
+CONFIG_SERIAL=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+
+# UART console
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y