boards: shields: Add Mikroe Silent Step 2 Click Shield

The Silent Step 2 Click shield offers a ADI TMC3130 stepper driver.
Some pins are accessed via a NXP PCA9538A gpio expander.

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

Author: jbehrensnx

boards/shields/mikroe_silent_step_2_click/Kconfig.shield

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+# Copyright (c) 2025 Navimatix GmbH
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_MIKROE_SILENT_STEP_2_CLICK
+	def_bool $(shields_list_contains,mikroe_silent_step_2_click)

boards/shields/mikroe_silent_step_2_click/doc/index.rst

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+.. _mikroe_silent_step_2_click:
+
+MikroElektronika Silent Step 2 Click
+####################################
+
+Overview
+********
+
+The MikroElektronika `Silent Step 2 Click`_ features the `ADI TMC2130`_ stepper driver with step-dir
+control via gpio and configuration via spi. A `NXP PCA9538A`_ gpio expander accessed via i2c offers
+access to additional pins of th stepper driver.
+The TMC2130 uses by default the work-queue timing source, but that can be changed.
+
+.. figure:: silent_step_2_click.webp
+   :align: center
+   :alt: MikroElektronika Silent Step 2 Click
+
+   MikroElektronika Silent Step 2 Click (Credit: MikroElektronika)
+
+Requirements
+************
+
+This shield can only be used with a board that provides a mikroBUS
+socket and defines a ``mikrobus_i2c`` node label for the mikroBUS I2C
+interface, a ``mikrobus_spi`` node label for the mikroBUS SPI
+interface and a ``mikrobus_header`` node label (see :ref:`shields` for more details).
+
+Programming
+***********
+
+.. zephyr-app-commands::
+   :zephyr-app: <app>
+   :board: <board>
+   :shield: mikroe_silent_step_2_click
+   :goals: build
+
+.. _Silent Step 2 Click:
+   https://www.mikroe.com/silent-step-2-click
+
+.. _ADI TMC2130:
+   https://www.analog.com/en/products/tmc2130.html
+
+.. _NXP PCA9538A:
+   https://www.nxp.com/products/interfaces/ic-spi-i3c-interface-devices/general-purpose-i-o-gpio/low-voltage-8-bit-ic-bus-i-o-port-with-interrupt-and-reset:PCA9538A

boards/shields/mikroe_silent_step_2_click/doc/silent_step_2_click.webp

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+/*
+ * Copyright (c) 2025 Navimatix GmbH
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&mikrobus_i2c {
+	status = "okay";
+	pca9538a_mikroe_silent_step_2_click: pca9538a@70 {
+		status = "okay";
+		compatible = "nxp,pca9538";
+
+		reg = <0x70>;
+
+		gpio-controller;
+		ngpios = <8>;
+		#gpio-cells = <2>;
+
+		gpio-reserved-ranges = <3 1>;
+
+		gpio-line-names =
+			"EN",
+			"FT1",
+			"FT2";
+	};
+};
+
+&mikrobus_spi {
+	cs-gpios = <&mikrobus_header 2 GPIO_ACTIVE_LOW>;
+	status = "okay";
+	tmc2130_mikroe_silent_step_2_click: tmc2130@0 {
+		compatible = "adi,tmc2130";
+		reg = <0>;
+		spi-max-frequency = <DT_FREQ_M(1)>;
+
+		dir-gpios = <&mikrobus_header 0 0>;
+		step-gpios = <&mikrobus_header 6 0>;
+		en-gpios  = <&pca9538a_mikroe_silent_step_2_click 0 GPIO_ACTIVE_LOW>;
+		irun = <20>;
+		ihold = <20>;
+		en-pwm-mode;
+	};
+};

boards/shields/mikroe_silent_step_2_click/mikroe_silent_step_2_click.overlay

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+shield:
+  name: mikroe_silent_step_2_click
+  full_name: Silent Step 2 Click
+  vendor: mikroe
+  supported_features:
+    - stepper