[PATCH v2 8/9] ARM: dts: stm32: add Ruiside ART-Pi2 board

Add the STM32H7R7-based ART-Pi2 with 32 MiB of external HyperRAM,
UART4 console pin configuration, user LEDs on PO1 and PO5, and the
user button on PC13. Enable the four-bit microSD slot and reserve a
coherent DMA pool for noMMU DMA allocations.

Signed-off-by: Liu Changjie <[email protected]>
---
 arch/arm/boot/dts/st/Makefile                |   1 +
 arch/arm/boot/dts/st/stm32h7r7l8-art-pi2.dts | 100 +++++++++++++++++++
 arch/arm/boot/dts/st/stm32h7rs-pinctrl.dtsi  |  63 ++++++++++++
 3 files changed, 164 insertions(+)
 create mode 100644 arch/arm/boot/dts/st/stm32h7r7l8-art-pi2.dts
 create mode 100644 arch/arm/boot/dts/st/stm32h7rs-pinctrl.dtsi

diff --git a/arch/arm/boot/dts/st/Makefile b/arch/arm/boot/dts/st/Makefile
index 10c5d75f6..ae27a4ef9 100644
--- a/arch/arm/boot/dts/st/Makefile
+++ b/arch/arm/boot/dts/st/Makefile
@@ -113,6 +113,7 @@ dtb-$(CONFIG_ARCH_STM32) += \
 	stm32h743i-disco.dtb \
 	stm32h747i-disco.dtb \
 	stm32h750i-art-pi.dtb \
+	stm32h7r7l8-art-pi2.dtb \
 	stm32mp133c-prihmb.dtb \
 	stm32mp135f-dhcor-dhsbc.dtb \
 	stm32mp13xx-dhcor-dhsbc-overlay-rb-tft32-v2.dtb \
diff --git a/arch/arm/boot/dts/st/stm32h7r7l8-art-pi2.dts b/arch/arm/boot/dts/st/stm32h7r7l8-art-pi2.dts
new file mode 100644
index 000000000..ead141817
--- /dev/null
+++ b/arch/arm/boot/dts/st/stm32h7r7l8-art-pi2.dts
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
+/dts-v1/;
+
+#include "stm32h7r7.dtsi"
+#include "stm32h7rs-pinctrl.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	model = "RT-Thread ART-Pi2 STM32H7R7 board";
+	compatible = "ruiside,art-pi2", "st,stm32h7r7";
+
+	chosen {
+		bootargs = "earlycon console=ttySTM0,115200";
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@90000000 {
+		device_type = "memory";
+		reg = <0x90000000 0x02000000>;
+	};
+
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		dma_pool: dma-pool {
+			compatible = "shared-dma-pool";
+			no-map;
+			size = <0x00200000>;
+			linux,dma-default;
+		};
+	};
+
+	aliases {
+		mmc0 = &sdmmc1;
+		serial0 = &uart4;
+	};
+
+	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_red: led-red {
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_INDICATOR;
+			gpios = <&gpioo 1 GPIO_ACTIVE_HIGH>;
+		};
+
+		led_blue: led-blue {
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_HEARTBEAT;
+			gpios = <&gpioo 5 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "heartbeat";
+		};
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		button-user {
+			label = "User";
+			linux,code = <KEY_WAKEUP>;
+			gpios = <&gpioc 13 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&uart4 {
+	pinctrl-0 = <&uart4_pins_a>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&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>;
+	broken-cd;
+	st,neg-edge;
+	bus-width = <4>;
+	vmmc-supply = <&v3v3>;
+	max-frequency = <50000000>;
+	status = "okay";
+};
+
+&clk_hse {
+	clock-frequency = <24000000>;
+};
diff --git a/arch/arm/boot/dts/st/stm32h7rs-pinctrl.dtsi b/arch/arm/boot/dts/st/stm32h7rs-pinctrl.dtsi
new file mode 100644
index 000000000..08f09f562
--- /dev/null
+++ b/arch/arm/boot/dts/st/stm32h7rs-pinctrl.dtsi
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Copyright (C) 2026 Liu Changjie <[email protected]>
+ */
+
+#include <dt-bindings/pinctrl/stm32-pinfunc.h>
+
+&pinctrl {
+	sdmmc1_b4_pins_a: sdmmc1-b4-0 {
+		pins {
+			pinmux = <STM32_PINMUX('C', 8, AF11)>, /* SDMMC1_D0 */
+				 <STM32_PINMUX('C', 9, AF11)>, /* SDMMC1_D1 */
+				 <STM32_PINMUX('C', 10, AF12)>, /* SDMMC1_D2 */
+				 <STM32_PINMUX('C', 11, AF11)>, /* SDMMC1_D3 */
+				 <STM32_PINMUX('C', 12, AF11)>, /* SDMMC1_CK */
+				 <STM32_PINMUX('D', 2, AF11)>; /* SDMMC1_CMD */
+			slew-rate = <3>;
+			drive-push-pull;
+			bias-disable;
+		};
+	};
+
+	sdmmc1_b4_od_pins_a: sdmmc1-b4-od-0 {
+		pins1 {
+			pinmux = <STM32_PINMUX('C', 8, AF11)>, /* SDMMC1_D0 */
+				 <STM32_PINMUX('C', 9, AF11)>, /* SDMMC1_D1 */
+				 <STM32_PINMUX('C', 10, AF12)>, /* SDMMC1_D2 */
+				 <STM32_PINMUX('C', 11, AF11)>, /* SDMMC1_D3 */
+				 <STM32_PINMUX('C', 12, AF11)>; /* SDMMC1_CK */
+			slew-rate = <3>;
+			drive-push-pull;
+			bias-disable;
+		};
+
+		pins2 {
+			pinmux = <STM32_PINMUX('D', 2, AF11)>; /* SDMMC1_CMD */
+			slew-rate = <3>;
+			drive-open-drain;
+			bias-disable;
+		};
+	};
+
+	sdmmc1_b4_sleep_pins_a: sdmmc1-b4-sleep-0 {
+		pins {
+			pinmux = <STM32_PINMUX('C', 8, ANALOG)>, /* SDMMC1_D0 */
+				 <STM32_PINMUX('C', 9, ANALOG)>, /* SDMMC1_D1 */
+				 <STM32_PINMUX('C', 10, ANALOG)>, /* SDMMC1_D2 */
+				 <STM32_PINMUX('C', 11, ANALOG)>, /* SDMMC1_D3 */
+				 <STM32_PINMUX('C', 12, ANALOG)>, /* SDMMC1_CK */
+				 <STM32_PINMUX('D', 2, ANALOG)>; /* SDMMC1_CMD */
+		};
+	};
+
+	uart4_pins_a: uart4-0 {
+		pins {
+			pinmux = <STM32_PINMUX('D', 0, AF8)>, /* UART4_RX */
+				 <STM32_PINMUX('D', 1, AF8)>; /* UART4_TX */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <0>;
+		};
+	};
+};
-- 
2.55.0