arm64: dts: rockchip: Add Radxa CM3J on RPi CM4 IO Board

The Raspberry Pi Compute Module 4 IO Board is an application board for
the Compute Module 4. [1]

This patch adds support for the Radxa CM3J mounted on the RPi CM4 IO
Board.

Specification:
- 12V 5521 DC jack
- 2x full-size HDMI 2.0 connectors (only HDMI0 is supported with CM3J)
- Gigabit Ethernet RJ45 with PoE support
- 2x USB 2.0 connectors, with header for two more connectors
- Micro USB connector
- microSD card socket
- PCIe Gen 2 x1 socket
- 12V 4-pin PWM fan connector
- External power connector (+5V, +12V)
- 2x MIPI DSI connectors
- 2x MIPI CSI-2 connectors
- 40-pin GPIO header
- RTC with battery socket
- Red (power) and green (heartbeat) LEDs

[1] https://datasheets.raspberrypi.com/cm4io/cm4io-datasheet.pdf

Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
Link: https://patch.msgid.link/20260108113341.14037-3-naoki@radxa.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: RadxaNaoki

arch/arm64/boot/dts/rockchip/Makefile

@@ -149,6 +149,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-odroid-m1.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-photonicat.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-qnap-ts233.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-qnap-ts433.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-radxa-cm3j-rpi-cm4.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-radxa-e25.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-roc-pc.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-rock-3a.dtb

arch/arm64/boot/dts/rockchip/rk3568-radxa-cm3j-rpi-cm4.dts

@@ -0,0 +1,204 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2025 Radxa Computer (Shenzhen) Co., Ltd.
+ */
+
+/dts-v1/;
+
+#include <dt-bindings/leds/common.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/pinctrl/rockchip.h>
+#include "rk3568-radxa-cm3j.dtsi"
+
+/ {
+	model = "Radxa CM3J on RPi CM4 IO Board";
+	compatible = "radxa,cm3j-rpi-cm4", "radxa,cm3j", "rockchip,rk3568";
+
+	aliases {
+		ethernet0 = &gmac1;
+		mmc1 = &sdmmc0;
+		rtc0 = &pcf85063;
+	};
+
+	chosen {
+		stdout-path = "serial2:1500000n8";
+	};
+
+	hdmi-con {
+		compatible = "hdmi-connector";
+		type = "a";
+
+		port {
+			hdmi_con_in: endpoint {
+				remote-endpoint = <&hdmi_out_con>;
+			};
+		};
+	};
+
+	leds-1 {
+		compatible = "gpio-leds";
+
+		led-1 {
+			color = <LED_COLOR_ID_RED>;
+			default-state = "on";
+			function = LED_FUNCTION_POWER;
+			gpios = <&gpio3 RK_PC4 GPIO_ACTIVE_LOW>;
+			pinctrl-names = "default";
+			pinctrl-0 = <&npwr_led>;
+		};
+
+		led-2 {
+			color = <LED_COLOR_ID_GREEN>;
+			default-state = "on";
+			function = LED_FUNCTION_STATUS;
+			gpios = <&gpio4 RK_PC6 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "heartbeat";
+			pinctrl-names = "default";
+			pinctrl-0 = <&pi_nled_activity>;
+		};
+	};
+
+	dc12v: regulator-12v0 {
+		compatible = "regulator-fixed";
+		regulator-name = "dc12v";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <12000000>;
+		regulator-max-microvolt = <12000000>;
+	};
+
+	dc3v3_pcie: regulator-3v3-2 {
+		compatible = "regulator-fixed";
+		regulator-name = "dc3v3_pcie";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&dc12v>;
+	};
+
+	gpio_vref: regulator-3v3-3 {
+		compatible = "regulator-fixed";
+		regulator-name = "gpio_vref";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&dc3v3>;
+	};
+
+	dc5v: regulator-5v0 {
+		compatible = "regulator-fixed";
+		regulator-name = "dc5v";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		vin-supply = <&dc12v>;
+	};
+};
+
+&combphy0 {
+	status = "okay";
+};
+
+&combphy2 {
+	status = "okay";
+};
+
+&gmac1 {
+	status = "okay";
+};
+
+&gpio0 {
+	nextrst-hog {
+		gpio-hog;
+		/*
+		 * GPIO_ACTIVE_LOW + output-low here means that the pin is set
+		 * to high, because output-low decides the value pre-inversion.
+		 */
+		gpios = <RK_PC0 GPIO_ACTIVE_LOW>;
+		line-name = "nEXTRST";
+		output-low;
+	};
+};
+
+&hdmi {
+	status = "okay";
+};
+
+&hdmi_sound {
+	status = "okay";
+};
+
+&i2c0 {
+	emc2301: fan-controller@2f {
+		compatible = "microchip,emc2301", "microchip,emc2305";
+		reg = <0x2f>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		#pwm-cells = <3>;
+
+		fan@0 {
+			reg = <0x0>;
+			pwms = <&emc2301 26000 0 1>;
+			#cooling-cells = <2>;
+		};
+	};
+
+	pcf85063: rtc@51 {
+		compatible = "nxp,pcf85063a";
+		reg = <0x51>;
+		wakeup-source;
+	};
+};
+
+&i2s0_8ch {
+	status = "okay";
+};
+
+&pinctrl {
+	leds {
+		npwr_led: npwr-led {
+			rockchip,pins = <3 RK_PC4 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+
+		pi_nled_activity: pi-nled-activity {
+			rockchip,pins = <4 RK_PC6 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+};
+
+&pcie2x1 {
+	vpcie3v3-supply = <&dc3v3_pcie>;
+	status = "okay";
+};
+
+&sdmmc0 {
+	bus-width = <4>;
+	cap-sd-highspeed;
+	broken-cd;
+	disable-wp;
+	no-mmc;
+	no-sdio;
+	pinctrl-names = "default";
+	pinctrl-0 = <&sdmmc0_bus4 &sdmmc0_clk &sdmmc0_cmd>;
+	vmmc-supply = <&dc3v3>;
+	status = "okay";
+};
+
+&uart2 {
+	status = "okay";
+};
+
+&usb2phy0 {
+	status = "okay";
+};
+
+&usb2phy0_otg {
+	status = "okay";
+};
+
+&usb_host0_xhci {
+	status = "okay";
+};