shields: st_b_cams_imx_mb1854: add imx335 based MB1854 board shield

Introduce the B_CAMS_IMX camera shield for STM32 which embeds
a IMX335 camera sensor.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

boards/shields/st_b_cams_imx_mb1854/Kconfig.shield

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+# Copyright (c) 2025 STMicroelectronics.
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_ST_B_CAMS_IMX_MB1854
+	def_bool $(shields_list_contains,st_b_cams_imx_mb1854)

boards/shields/st_b_cams_imx_mb1854/doc/index.rst

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+.. _st_b_cams_imx_mb1854:
+
+ST B-CAMS-IMX-MB1854
+####################
+
+Overview
+********
+
+The B-CAMS-IMX camera module provides a compelling hardware set to
+handle multiple computer vision scenarios and use cases. It features
+a high-resolution 5‑Mpx RGB CMOS image sensor, an inertial motion unit,
+and a Time‑of‑Flight sensor. It can be used with any STM32 boards featuring
+a MIPI CSI-2® interface with a 22‑pin FFC connector to enable full-featured
+computer vision on STM32 microcontrollers and microprocessors easily.
+
+.. figure:: st_b_cams_imx.webp
+     :width: 600px
+     :align: center
+     :alt: B-CAMS-IMX-MB1854
+
+     B-CAMS-IMX MB1854 Image (Credit: STMicroelectronics.)
+
+Requirements
+************
+
+The camera module bundle is compatible with all STM32 Discovery kits and
+Evaluation boards featuring a 22 pins FFC connector, such as the STM32N6570_DK
+Discovery kit.
+
+Usage
+*****
+
+The shield can be used in any application by setting ``SHIELD`` to
+``st_b_cams_imx_mb1854`` for boards with the necessary device tree node labels.
+
+Set ``--shield "st_b_cams_imx_mb1854"`` when you invoke ``west build``. For example:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/drivers/video/capture
+   :board: stm32n6570_dk
+   :shield: st_b_cams_imx_mb1854
+   :goals: build
+
+References
+**********
+
+- `Product page <https://www.st.com/en/evaluation-tools/b-cams-imx.html>`_
+
+- `Databrief <https://www.st.com/resource/en/data_brief/b-cams-imx.pdf>`_
+
+- `User manual <https://www.st.com/resource/en/user_manual/um3354-camera-module-bundle-for-stm32-boards-stmicroelectronics.pdf>`_

boards/shields/st_b_cams_imx_mb1854/st_b_cams_imx_mb1854.overlay

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+/*
+ * Copyright (c) 2025 STMicroelectronics.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ */
+
+#include <zephyr/dt-bindings/gpio/raspberrypi-csi-22pins-connector.h>
+#include <zephyr/dt-bindings/video/video-interfaces.h>
+
+/ {
+	chosen {
+		zephyr,camera = &csi_22pins_capture_port;
+	};
+
+	imx335_input_clock: imx335-input-clock {
+		compatible = "fixed-clock";
+		clock-frequency = <24000000>;
+		#clock-cells = <0>;
+	};
+};
+
+&csi_22pins_interface {
+	status = "okay";
+};
+
+&csi_22pins_ep_in {
+	remote-endpoint-label = "imx335_ep_out";
+	bus-type = <VIDEO_BUS_TYPE_CSI2_DPHY>;
+	data-lanes = <1 2>;
+};
+
+&csi_22pins_i2c {
+	imx335: camera@1a {
+		compatible = "sony,imx335";
+		clocks = <&imx335_input_clock>;
+		reg = <0x1a>;
+		reset-gpios = <&csi_22pins_connector CSI_22PINS_IO0 GPIO_ACTIVE_LOW>;
+
+		port {
+			imx335_ep_out: endpoint {
+				remote-endpoint-label = "csi_22pins_ep_in";
+				bus-type = <VIDEO_BUS_TYPE_CSI2_DPHY>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
+};
+
+&csi_22pins_connector {
+	/* Power the camera module */
+	en-module-gpios {
+		gpio-hog;
+		gpios = <CSI_22PINS_IO1 GPIO_ACTIVE_HIGH>;
+		output-high;
+	};
+};