[RFC PATCH 3/3] arm64: dts: rockchip: Add Radxa CM3J on RPi CM4 IO Board
FUKAUMI Naoki
naoki at radxa.com
Sun Dec 28 23:58:19 PST 2025
Hi all,
On 12/29/25 16:38, FUKAUMI Naoki wrote:
> 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 at radxa.com>
> ---
> arch/arm64/boot/dts/rockchip/Makefile | 1 +
> .../rockchip/rk3568-radxa-cm3j-rpi-cm4.dts | 204 ++++++++++++++++++
> 2 files changed, 205 insertions(+)
> create mode 100644 arch/arm64/boot/dts/rockchip/rk3568-radxa-cm3j-rpi-cm4.dts
>
> diff --git a/arch/arm64/boot/dts/rockchip/Makefile b/arch/arm64/boot/dts/rockchip/Makefile
> index 3fdd1e4832e1..37150e920b01 100644
> --- a/arch/arm64/boot/dts/rockchip/Makefile
> +++ b/arch/arm64/boot/dts/rockchip/Makefile
> @@ -148,6 +148,7 @@ 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
> diff --git a/arch/arm64/boot/dts/rockchip/rk3568-radxa-cm3j-rpi-cm4.dts b/arch/arm64/boot/dts/rockchip/rk3568-radxa-cm3j-rpi-cm4.dts
> new file mode 100644
> index 000000000000..b91ac0ca854c
> --- /dev/null
> +++ b/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 {
It's labeled as '+12v' in the schematic. Do you have any other
suggestions for the name?
> + 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 {
It's labeled as '+3.3v' in the schematic. Do you have any other
suggestions for the name?
> + 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 {
It's labeled as '+5v' in the schematic. Do you have any other
suggestions for the name?
Best regards,
--
FUKAUMI Naoki
Radxa Computer (Shenzhen) Co., Ltd.
> + 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 at 2f {
> + compatible = "microchip,emc2301", "microchip,emc2305";
> + reg = <0x2f>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + #pwm-cells = <3>;
> +
> + fan at 0 {
> + reg = <0x0>;
> + pwms = <&emc2301 26000 0 1>;
> + #cooling-cells = <2>;
> + };
> + };
> +
> + pcf85063: rtc at 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";
> +};
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