variants/portenta_h7: Add support for Analogix ANX7625 MIPI-DSI.

dts/bindings/video/analogix,anx7625.yaml

@@ -0,0 +1,24 @@
+# Copyright (c) Arduino SRL
+# SPDX-License-Identifier: Apache-2.0
+
+title: Analogix ANX7625 MIPI-DSI to DisplayPort bridge
+
+description: |
+    Analogix ANX7625 MIPI-DSI to DisplayPort converter bridge.
+
+compatible: "analogix,anx7625"
+
+include: [mipi-dsi-device.yaml]
+
+properties:
+  video-on-gpios:
+    type: phandle-array
+    description: GPIO for powering on the video bridge
+
+  video-rst-gpios:
+    type: phandle-array
+    description: GPIO for resetting the video bridge
+
+  otg-on-gpios:
+    type: phandle-array
+    description: GPIO for OTG control

loader/CMakeLists.txt

@@ -10,6 +10,9 @@ find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE} COMPONENTS yaml boards)
 set(DTC_OVERLAY_FILE ${CMAKE_CURRENT_LIST_DIR}/../variants/${NORMALIZED_BOARD_TARGET}/${NORMALIZED_BOARD_TARGET}.overlay)
 set(EXTRA_CONF_FILE ${CMAKE_CURRENT_LIST_DIR}/../variants/${NORMALIZED_BOARD_TARGET}/${NORMALIZED_BOARD_TARGET}.conf)
 
+# Add dts/bindings to DTS_ROOT for custom bindings
+list(APPEND DTS_ROOT ${CMAKE_CURRENT_LIST_DIR}/..)
+
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 
 project(app LANGUAGES C CXX)

variants/arduino_portenta_h7_stm32h747xx_m7/arduino_portenta_h7_stm32h747xx_m7.conf

@@ -31,11 +31,11 @@ CONFIG_ARM_MPU=y
 CONFIG_MAX_THREAD_BYTES=4
 
 CONFIG_MAIN_STACK_SIZE=32768
-CONFIG_LLEXT_HEAP_SIZE=128
+CONFIG_LLEXT_HEAP_SIZE=256
 
 CONFIG_CODE_DATA_RELOCATION=y
 CONFIG_MAIN_STACK_REGION="DTCM"
-CONFIG_LLEXT_HEAP_REGION="SRAM2"
+CONFIG_LLEXT_HEAP_REGION="SRAM1"
 
 CONFIG_ADC=y
 CONFIG_PWM=y
@@ -126,6 +126,16 @@ CONFIG_VIDEO_BUFFER_POOL_SZ_MAX=614400
 CONFIG_VIDEO_BUFFER_POOL_ALIGN=32
 CONFIG_VIDEO_BUFFER_USE_SHARED_MULTI_HEAP=y
 CONFIG_VIDEO_BUFFER_SMH_ATTRIBUTE=2
+
+# Display subsystem for USB-C Video (ANX7625)
+CONFIG_DISPLAY=y
+CONFIG_DISPLAY_INIT_PRIORITY=80
+CONFIG_STM32_LTDC=y
+CONFIG_STM32_LTDC_FB_NUM=2
+CONFIG_STM32_LTDC_FB_SMH_ATTRIBUTE=2
+CONFIG_STM32_LTDC_FB_USE_SHARED_MULTI_HEAP=y
+CONFIG_MIPI_DSI=y
+CONFIG_MIPI_DSI_STM32=y
 CONFIG_FLASH=y
 
 CONFIG_BT=y

variants/arduino_portenta_h7_stm32h747xx_m7/arduino_portenta_h7_stm32h747xx_m7.overlay

@@ -258,6 +258,8 @@
 / {
 	chosen {
 		zephyr,camera = &dcmi;
+		zephyr,display = &ltdc;
+		zephyr,mipi-dsi = &mipi_dsi;
 		zephyr,console = &usart6;
 		zephyr,shell-uart = &usart6;
 		zephyr,cdc-acm-uart0 = &usart6;
@@ -299,18 +301,18 @@
 					#size-cells = <1>;
 
 					boot_partition: partition@0 {
-							label = "mcuboot";
-							reg = <0x00000000 0x00040000>;
-							read-only;
+						label = "mcuboot";
+						reg = <0x00000000 0x00040000>;
+						read-only;
 					};
 
 					slot0_partition: partition@40000 {
-							label = "image-0";
-							reg = <0x00040000 0x000A0000>;
+						label = "image-0";
+						reg = <0x00040000 0x000A0000>;
 					};
 
 					user_sketch: partition@e0000 {
-						reg = <0x0E0000 0x20000>;
+						reg = <0x000E0000 0x00040000>;
 					};
 				};
 			};
@@ -408,3 +410,85 @@ qspi_flash: &mx25l12833f {};
 			      <&adc1 13>; /* Hack for D20 */
 	};
 };
+
+&sram1 {
+	reg = <0x30000000 DT_SIZE_K(256)>;
+};
+
+/delete-node/ &sram2;
+
+&sdram1 {
+	/* Frame buffer memory cache will cause screen flickering. */
+	zephyr,memory-attr = <( DT_MEM_ARM(ATTR_MPU_RAM_NOCACHE) )>;
+};
+
+/*
+ *PLL3 calculation for 1024x768@60Hz (57.8 MHz pixel clock)
+ * Portenta H7 uses 25 MHz HSE crystal
+ * VCO input = HSE / div-m = 25 MHz / 25 = 1 MHz
+ * VCO output = VCO input × mul-n = 1 MHz × 289 = 289 MHz
+ * Pixel clock = VCO output / div-r = 289 MHz / 5 = 57.8 MHz
+ */
+&pll3 {
+	status = "okay";
+	clocks = <&clk_hse>;
+	div-m = <25>;   /* HSE_VALUE/1MHz: 25MHz/25 = 1 MHz VCO input */
+	mul-n = <289>;  /* pixelclock/200kHz: 57800/200 = 289 */
+	div-p = <2>;
+	div-q = <7>;
+	div-r = <5>;    /* 1000/200kHz = 5 -> 289MHz/5 = 57.8 MHz */
+};
+
+&ltdc {
+	status = "okay";
+	ext-sdram = <&sdram1>;
+	width = <1024>;
+	height = <768>;
+	def-back-color-red = <0>;
+	def-back-color-green = <0>;
+	def-back-color-blue = <0>;
+	pixel-format = <PANEL_PIXEL_FORMAT_RGB_565>;
+
+	display-timings {
+		compatible = "zephyr,panel-timing";
+		hsync-active = <0>;
+		vsync-active = <0>;
+		de-active = <0>;
+		pixelclk-active = <0>;
+		hsync-len = <68>;
+		hfront-porch = <24>;
+		hback-porch = <80>;
+		vsync-len = <6>;
+		vfront-porch = <3>;
+		vback-porch = <29>;
+	};
+};
+
+&mipi_dsi {
+	status = "okay";
+
+	pll-ndiv = <40>;
+	pll-idf = <2>;
+	pll-odf = <0>;
+
+	de-active-high;
+	bta-ack-disable;  /* ANX7625 bridge doesn't respond to BTA requests */
+	largest-packet-size = <16>;
+
+	phy-timings = <35 35 35 35 0 10>;
+
+	/*
+	 * This binding allows adding child node with with data-lanes property
+	 * as required by STM32 MIPI-DSI driver.
+	 */
+	anx7625: anx7625@0 {
+		status = "okay";
+		compatible = "analogix,anx7625";
+		reg = <0>;  /* Virtual channel 0 */
+		pixel-format = <0>;  /* Not used */
+		data-lanes = <2>;  /* 2 data lanes */
+		video-on-gpios = <&gpiok 2 GPIO_ACTIVE_HIGH>;
+		video-rst-gpios = <&gpioj 3 GPIO_ACTIVE_HIGH>;
+		otg-on-gpios = <&gpioj 6 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+	};
+};