boards: shields: Added Mikroe Stepper 18 Click Shield

This shield includes a drv8426 stepper driver and a mcp4726 dac for
current control. Note that the micro-step pins are controlled by
physical switches and are thus not available in Zephyr.

Signed-off-by: Jan Behrens <jan.behrens@navimatix.de>

boards/shields/mikroe_stepper_18_click/Kconfig.shield

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+# Copyright (c) 2025 Navimatix GmbH
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_MIKROE_STEPPER_18_CLICK
+	def_bool $(shields_list_contains,mikroe_stepper_18_click)

boards/shields/mikroe_stepper_18_click/doc/index.rst

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+.. _mikroe_stepper_18_click_shield:
+
+MikroElektronika Stepper 18 Click
+#################################
+
+Overview
+********
+
+Stepper 18 Click shield has a TI DRV426 stepper driver accessed via GPIO.
+It also features a Microchip MCP4726 DAC to allow for current control. The
+micro-step pins are controlled via physical switches, making them unavailable
+in Zephyr.
+The DRV8426 uses the work-queue timing source by default.
+
+Note that the MCP4726 is compatible with the MCP4725 driver.
+
+More information about the shield can be found at
+`Mikroe Stepper 18 click`_.
+
+.. figure:: stepper_18_click.webp
+   :align: center
+   :alt: MikroElektronika Stepper 18 Click
+
+   MikroElektronika Stepper 18 Click (Credit: MikroElektronika)
+
+Requirements
+************
+
+The shield uses a mikroBUS interface. The target board must define
+a ``mikrobus_i2c`` and ``mikrobus_header``  node labels
+(see :ref:`shields` for more details).
+
+Programming
+***********
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/drivers/stepper/generic/
+   :board: <board>
+   :shield: mikroe_stepper_18_click
+   :goals: build flash
+
+References
+**********
+
+.. target-notes::
+
+.. _Mikroe Stepper 18 click:
+   https://www.mikroe.com/stepper-18-click

boards/shields/mikroe_stepper_18_click/mikroe_stepper_18_click.overlay

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+/*
+ * Copyright (c) 2025 Navimatix GmbH
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		stepper = &drv8426_mikroe_stepper_18_click;
+	};
+};
+
+&mikrobus_i2c {
+	status = "okay";
+
+	mcp4726_mikroe_stepper_18_click: mcp4726@70 {
+		status = "okay";
+		compatible = "microchip,mcp4725";
+		reg = < 0x60 >;
+
+		#io-channel-cells = <1>;
+	};
+};
+
+/ {
+	drv8426_mikroe_stepper_18_click: drv8426 {
+		status = "okay";
+		compatible = "ti,drv84xx";
+
+		dir-gpios = <&mikrobus_header 0 0>;
+		step-gpios = <&mikrobus_header 6 0>;
+		sleep-gpios = <&mikrobus_header 1 GPIO_ACTIVE_LOW>;
+		en-gpios  = <&mikrobus_header 2 0>;
+		fault-gpios = <&mikrobus_header 7 GPIO_ACTIVE_LOW>;
+	};
+};

boards/shields/mikroe_stepper_18_click/shield.yml

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+shield:
+  name: mikroe_stepper_18_click
+  full_name: Stepper 18 Click
+  vendor: mikroe
+  supported_features:
+    - stepper