ARM: dts: stm32: support STM32h747i-disco board

The board includes an STM32H747XI SoC with the following resources:
 - 2 Mbytes Flash
 - 1 Mbyte SRAM
 - LCD-TFT controller
 - MIPI-DSI interface
 - FD-CAN
 - USB 2.0 high-speed/full-speed
 - Ethernet MAC
 - camera interface

Detailed information can be found at:
https://www.st.com/en/evaluation-tools/stm32h747i-disco.html

Signed-off-by: Dario Binacchi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexandre Torgue <[email protected]>

Author: passgat

arch/arm/boot/dts/st/Makefile

@@ -28,6 +28,7 @@ dtb-$(CONFIG_ARCH_STM32) += \
 	stm32746g-eval.dtb \
 	stm32h743i-eval.dtb \
 	stm32h743i-disco.dtb \
+	stm32h747i-disco.dtb \
 	stm32h750i-art-pi.dtb \
 	stm32mp133c-prihmb.dtb \
 	stm32mp135f-dhcor-dhsbc.dtb \

arch/arm/boot/dts/st/stm32h747i-disco.dts

@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2025 Amarula Solutions, Dario Binacchi <[email protected]>
+ */
+
+/dts-v1/;
+#include "stm32h743.dtsi"
+#include "stm32h7-pinctrl.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	model = "STMicroelectronics STM32H747i-Discovery board";
+	compatible = "st,stm32h747i-disco", "st,stm32h747";
+
+	chosen {
+		bootargs = "root=/dev/ram";
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@d0000000 {
+		device_type = "memory";
+		reg = <0xd0000000 0x2000000>;
+	};
+
+	aliases {
+		serial0 = &usart1;
+		serial1 = &uart8;
+	};
+
+	v3v3: regulator-v3v3 {
+		compatible = "regulator-fixed";
+		regulator-name = "v3v3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led-green {
+			gpios = <&gpioi 12 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "heartbeat";
+		};
+		led-orange {
+			gpios = <&gpioi 13 GPIO_ACTIVE_LOW>;
+		};
+		led-red {
+			gpios = <&gpioi 14 GPIO_ACTIVE_LOW>;
+		};
+		led-blue {
+			gpios = <&gpioi 15 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+		autorepeat;
+		button-0 {
+			label = "User";
+			linux,code = <KEY_WAKEUP>;
+			gpios = <&gpioc 13 GPIO_ACTIVE_HIGH>;
+		};
+		button-1 {
+			label = "JoySel";
+			linux,code = <KEY_ENTER>;
+			gpios = <&gpiok 2 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+		};
+		button-2 {
+			label = "JoyDown";
+			linux,code = <KEY_DOWN>;
+			gpios = <&gpiok 3 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+		};
+		button-3 {
+			label = "JoyUp";
+			linux,code = <KEY_UP>;
+			gpios = <&gpiok 6 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+		};
+		button-4 {
+			label = "JoyLeft";
+			linux,code = <KEY_LEFT>;
+			gpios = <&gpiok 4 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+		};
+		button-5 {
+			label = "JoyRight";
+			linux,code = <KEY_RIGHT>;
+			gpios = <&gpiok 5 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+		};
+	};
+};
+
+&clk_hse {
+	clock-frequency = <25000000>;
+};
+
+&mac {
+	status = "disabled";
+	pinctrl-0 = <&ethernet_rmii>;
+	pinctrl-names = "default";
+	phy-mode = "rmii";
+	phy-handle = <&phy0>;
+
+	mdio0 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "snps,dwmac-mdio";
+		phy0: ethernet-phy@0 {
+			reg = <0>;
+		};
+	};
+};
+
+&sdmmc1 {
+	pinctrl-names = "default", "opendrain", "sleep";
+	pinctrl-0 = <&sdmmc1_b4_pins_a>;
+	pinctrl-1 = <&sdmmc1_b4_od_pins_a>;
+	pinctrl-2 = <&sdmmc1_b4_sleep_pins_a>;
+	cd-gpios = <&gpioi 8 GPIO_ACTIVE_LOW>;
+	broken-cd;
+	st,neg-edge;
+	bus-width = <4>;
+	vmmc-supply = <&v3v3>;
+	status = "okay";
+};
+
+&usart1 {
+	pinctrl-0 = <&usart1_pins_b>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&uart8 {
+	pinctrl-0 = <&uart8_pins_a>;
+	pinctrl-names = "default";
+	status = "okay";
+};