shields: st_stm32f4dis_cam: ov9655 sensor based shield

Introduction of the STM32F4DIS-CAM shield for STM32 boards
embedding a DVP based OV9655 sensor.

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

Author: Alain Volmat

boards/shields/st_stm32f4dis_cam/Kconfig.shield

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+# Copyright (c) 2025 STMicroelectronics
+
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_ST_STM32F4DIS_CAM
+	def_bool $(shields_list_contains,st_stm32f4dis_cam)

boards/shields/st_stm32f4dis_cam/boards/stm32l4r9i_disco.conf

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+CONFIG_VIDEO_INIT_PRIORITY=72

boards/shields/st_stm32f4dis_cam/doc/index.rst

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+.. _st_stm32f4dis_cam:
+
+ST STM32F4DIS-CAM
+#################
+
+Overview
+********
+
+The STM32F4DIS-CAM camera board embeds a 1.3MPix OV9655 sensor and a
+30 pins FFC connector in order to be used for some of the STM32 Discovery
+kits such as STM32L4R9I-disco board offering a DVP camera interface.
+
+Requirements
+************
+
+The camera module bundle is compatible with STM32 Discovery kits and
+Evaluation boards featuring a 30 pins FFC connector, such as the STM32F4
+Discovery kit or STM32L4R9I Discovery kit.
+
+Usage
+*****
+
+The shield can be used in any application by setting ``SHIELD`` to
+``st_stm32f4dis_cam`` for boards with the necessary device tree node labels.
+
+Set ``--shield "st_stm32f4dis_cam"`` when you invoke ``west build``. For example:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/drivers/video/capture
+   :board: stm32l4r9i_disco
+   :shield: st_stm32f4dis_cam
+   :goals: build

boards/shields/st_stm32f4dis_cam/shield.yml

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+shield:
+  name: st_stm32f4dis_cam
+  full_name: ST STM32F4DIS-CAM
+  vendor: st
+  supported_features:
+    - video

boards/shields/st_stm32f4dis_cam/st_stm32f4dis_cam.overlay

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+/*
+ * Copyright (c) 2025 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,camera = &st_cam_dvp;
+	};
+};
+
+&dma2 {
+	status = "okay";
+};
+
+&dmamux1 {
+	status = "okay";
+};
+
+&st_cam_i2c {
+	ov9655: camera@30 {
+		compatible = "ovti,ov9655";
+		reg = <0x30>;
+		pwdn-gpios = <&dcmi_camera_connector 6 GPIO_ACTIVE_HIGH>;
+
+		port {
+			ov9655_ep_out: endpoint {
+				remote-endpoint-label = "dcmi_ep_in";
+			};
+		};
+	};
+};
+
+#define MCO1_SEL_SYSCLK 1
+
+#define MCO1_PRE_DIV_4 2
+
+&mco1 {
+	status = "okay";
+	clocks = <&rcc STM32_SRC_SYSCLK MCO1_SEL(MCO1_SEL_SYSCLK)>;
+	prescaler = <MCO1_PRE(MCO1_PRE_DIV_4)>;
+	pinctrl-0 = <&rcc_mco_pa8>;
+	pinctrl-names = "default";
+};
+
+&st_cam_dvp {
+	status = "okay";
+
+	/* DMA config is already hardcoded within the DCMI driver */
+	dmas = <&dma2 5 0 0>;
+
+	port {
+		dcmi_ep_in: endpoint {
+			remote-endpoint-label = "ov9655_ep_out";
+			bus-width = <8>;
+			hsync-active = <1>;
+			vsync-active = <1>;
+			pclk-sample = <1>;
+		};
+	};
+};