shields: add initial support for MikroE LTE IoT 10 Click

Add new shield featuring Sequans Monarch 2 GM02S modem.

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

Author: kartben

boards/shields/mikroe_lte_iot10_click/Kconfig.defconfig

@@ -0,0 +1,15 @@
+# Copyright (c) 2025 Benjamin Cabé <benjamin@zephyrproject.org>
+# SPDX-License-Identifier: Apache-2.0
+
+if SHIELD_MIKROE_LTE_IOT10_CLICK
+
+if MODEM_CELLULAR
+
+# Using regulator-fixed driver to pull RTS low and effectively disable flow control since it can't
+# really be setup in a generic way when using shields.
+config REGULATOR
+	default y
+
+endif # MODEM_CELLULAR
+
+endif # SHIELD_MIKROE_LTE_IOT10_CLICK

boards/shields/mikroe_lte_iot10_click/Kconfig.shield

@@ -0,0 +1,5 @@
+# Copyright (c) 2025 Benjamin Cabé <benjamin@zephyrproject.org>
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_MIKROE_LTE_IOT10_CLICK
+	def_bool $(shields_list_contains,mikroe_lte_iot10_click)

boards/shields/mikroe_lte_iot10_click/doc/index.rst

@@ -0,0 +1,55 @@
+.. _mikroe_lte_iot10_click_shield:
+
+MikroElektronika LTE IoT 10 Click
+#################################
+
+Overview
+********
+
+The MikroElektronika LTE IoT 10 Click is a compact add-on board that provides reliable LTE-M and
+NB-IoT connectivity for industrial and commercial IoT applications.
+
+This board features the Monarch 2 GM02S, a dual-mode LTE-M/NB-IoT module from Sequans (based on
+Sequans SQN3430 Chipset), offering global band support from 617MHz to 2.2GHz.
+
+.. figure:: mikroe_lte_iot10_click.webp
+   :align: center
+   :alt: MikroElektronika LTE IoT 10 Click
+
+   MikroElektronika LTE IoT 10 Click (Credit: MikroElektronika)
+
+Requirements
+************
+
+This shield can only be used with a development board that provides a configuration for mikroBUS
+connectors and defines a ``mikrobus_serial`` node alias for the mikroBUS UART interface
+(see :ref:`shields` for more details).
+
+For more information about the GM02S module and the LTE IoT 10 Click, you may refer to the following
+documentation:
+
+- `GM02S Datasheet`_
+- `LTE IoT 10 Click`_
+
+Programming
+***********
+
+Set ``--shield mikroe_lte_iot10_click`` when you invoke ``west build``. Here is an example with the
+:zephyr:code-sample:`cellular-modem` code sample:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/net/cellular_modem
+   :board: ek_ra6m4
+   :shield: mikroe_lte_iot10_click
+   :goals: build
+
+References
+**********
+
+.. target-notes::
+
+.. _GM02S Datasheet:
+   https://www.sequans.com/products-solutions/gm02s/
+
+.. _LTE IoT 10 Click:
+   https://www.mikroe.com/lte-iot-10-click

boards/shields/mikroe_lte_iot10_click/doc/mikroe_lte_iot10_click.webp

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2025 Benjamin Cabé <benjamin@zephyrproject.org>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		modem = &modem;
+		modem-uart = &mikrobus_serial;
+	};
+
+	en_rts {
+		compatible = "regulator-fixed";
+		regulator-name = "enable-rts";
+		enable-gpios = <&mikrobus_header 2 GPIO_ACTIVE_LOW>;
+		regulator-boot-on;
+	};
+};
+
+&mikrobus_serial {
+	status = "okay";
+	current-speed = <115200>;
+	modem: modem {
+		status = "okay";
+		compatible = "sqn,gm02s";
+		mdm-wake-gpios = <&mikrobus_header 0 (GPIO_OPEN_SOURCE | GPIO_ACTIVE_HIGH)>;
+		mdm-reset-gpios = <&mikrobus_header 1 (GPIO_OPEN_DRAIN | GPIO_ACTIVE_LOW)>;
+	};
+};