Hi,

On Mon, Nov 09, 2026 at 01:32:17PM +0100, Ricardo Pardini via B4 Relay wrote:
> From: Ricardo Pardini <ricardo@pardini.net>
> 
> The Radxa ROCK 5B, 5B+ and 5T carry an on-board Realtek RTL8125 NIC
> behind pcie2x1l2; the ROCK 5T has a second one behind pcie2x1l1.
> 
> Describe the PCI function nodes and attach ethernet0 (and, on the
> ROCK 5T, ethernet1) aliases, so that U-Boot's fdt_fixup_ethernet() can
> fill in their MAC addresses from its ethaddr/eth1addr environment.
> 
> The shared NIC goes in rk3588-rock-5b-5bp-5t.dtsi, the ROCK 5T's second
> NIC in rk3588-rock-5t.dts.
> 
> Signed-off-by: Ricardo Pardini <ricardo@pardini.net>
> ---

root@rock5b+ ~# lspci -nv -d 10ec:8125
0004:41:00.0 0200: 10ec:8125 (rev 05)
	Subsystem: 10ec:0123
	Device tree node: /sys/firmware/devicetree/base/pcie@fe190000/pcie@0,0/ethernet@0,0
	...

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com> # Rock 5B+

Greetings,

-- Sebastian


>  .../arm64/boot/dts/rockchip/rk3588-rock-5b-5bp-5t.dtsi | 15 +++++++++++++++
>  arch/arm64/boot/dts/rockchip/rk3588-rock-5t.dts        | 18 ++++++++++++++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-5bp-5t.dtsi b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-5bp-5t.dtsi
> index b8d90936fc20..e8a3eb33e402 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-5bp-5t.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-5bp-5t.dtsi
> @@ -10,6 +10,7 @@
>  
>  / {
>  	aliases {
> +		ethernet0 = &rtl_eth0;
>  		mmc0 = &sdhci;
>  		mmc1 = &sdmmc;
>  		mmc2 = &sdio;
> @@ -488,6 +489,20 @@ &pcie2x1l2 {
>  	reset-gpios = <&gpio3 RK_PB0 GPIO_ACTIVE_HIGH>;
>  	vpcie3v3-supply = <&vcc3v3_pcie2x1l2>;
>  	status = "okay";
> +
> +	pcie@0,0 {
> +		reg = <0x400000 0 0 0 0>;
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +		ranges;
> +		device_type = "pci";
> +		bus-range = <0x41 0x4f>;
> +
> +		rtl_eth0: ethernet@0,0 {
> +			compatible = "pci10ec,8125";
> +			reg = <0x410000 0 0 0 0>;
> +		};
> +	};
>  };
>  
>  &pcie30phy {
> diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5t.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5t.dts
> index 425036146b6d..b1a3e4b2165f 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5t.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5t.dts
> @@ -8,6 +8,10 @@ / {
>  	model = "Radxa ROCK 5T";
>  	compatible = "radxa,rock-5t", "rockchip,rk3588";
>  
> +	aliases {
> +		ethernet1 = &rtl_eth1;
> +	};
> +
>  	analog-sound {
>  		compatible = "audio-graph-card";
>  		label = "rk3588-es8316";
> @@ -76,6 +80,20 @@ &pcie2x1l1 {
>  	reset-gpios = <&gpio4 RK_PA2 GPIO_ACTIVE_HIGH>;
>  	vpcie3v3-supply = <&vcc3v3_pcie2x1l1>;
>  	status = "okay";
> +
> +	pcie@0,0 {
> +		reg = <0x300000 0 0 0 0>;
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +		ranges;
> +		device_type = "pci";
> +		bus-range = <0x31 0x3f>;
> +
> +		rtl_eth1: ethernet@0,0 {
> +			compatible = "pci10ec,8125";
> +			reg = <0x310000 0 0 0 0>;
> +		};
> +	};
>  };
>  
>  &pcie30phy {
> 
> -- 
> 2.47.3
> 
>