Subject: Re: [PATCH v2 0/2] describe PCIe ethernet interfaces and alias ethernet0/1 on NanoPC-T6

From: Sebastian Reichel <[email-masked]>
Date: Mon, 1 Jun 2026 15:05:00 +0200

Hi,

On Fri, May 29, 2026 at 05:31:23PM +0200, Ricardo Pardini via B4 Relay wrote:
> This describes the two on-board Realtek RTL8125BG PCIe Ethernet
> controllers on the FriendlyElec NanoPC-T6 (RK3588) board and aliases
> them to ethernet0/ethernet1.
> 
> Many Rockchip boards have on-board RTL8125 PCIe NICs, wired to
> pcie2x1l0 and pcie2x1l2. The controllers were already enabled in the
> board DT, but the Ethernet function nodes themselves are not
> described, so the kernel (and u-boot) has no DT handle on the NICs.
> 
> Adding the function nodes lets us:
> - expose stable ethernet0/ethernet1 aliases for the two NICs, the
>   same way other rk3588 boards alias their GMAC interfaces; and
> - let U-Boot's fdt_fixup_ethernet() patch mac-address properties in
>   at boot time from its ethaddr/eth1addr environment - useful on
>   boards (like this one) whose on-NIC EEPROM is not pre-programmed
>   with a unique MAC. The kernel and U-Boot then agree on the MAC,
>   which matters for network-boot setups.

This is the patch rationale and thus should be part of the commit
message in the first patch.

> Checkpatch warnings:
> -  WARNING: DT compatible string "pci10ec,8125" appears un-documented
> -  WARNING: DT compatible string vendor "pci10ec" appears un-documented
> Both are expected. "pciVVVV,DDDD" is the Open Firmware PCI Bus
> Binding spelling, where VVVV/DDDD are the PCI vendor and device IDs
> allocated by the PCI-SIG (10ec = Realtek, 8125 = RTL8125). It is not a
> DT vendor prefix.

No, it is not expected. We need some binding for it :) This is
similar to USB, see e.g.

Documentation/devicetree/bindings/net/microchip,lan95xx.yaml

Greetings,

-- Sebastian

> If this is seen as a good thing, it would apply very similarly to
> the Radxa Rock 5 series and others.
> 
> While at it, rename regulator vcc3v3_pcie2x1l0 to l1, since that is
> what is actually powers; since only cosmetic, I did not include
> a Fixes tag.
> 
> ---
> Changes in v2:
> - fix: pcie2x1l0, not pcie2x1l1; indirectly caught by Sashiko's review [1]
> - while-at-it: rename regulator vcc3v3_pcie2x1l0 to l1
> - Link to v1: https://patch.msgid.link/[email-masked]
> 
> [1] https://sashiko.dev/#/patchset/20260525-rk3588-dts-rtl-eth-describe-dt-alias-v1-1-a6fcda563ac7%40pardini.net
> 
> To: Rob Herring <[email-masked]>
> To: Krzysztof Kozlowski <[email-masked]>
> To: Conor Dooley <[email-masked]>
> To: Heiko Stuebner <[email-masked]>
> Cc: Sebastian Reichel <[email-masked]>
> Cc: [email-masked]
> Cc: [email-masked]
> Cc: [email-masked]
> Cc: [email-masked]
> Signed-off-by: Ricardo Pardini <[email-masked]>
> 
> ---
> Ricardo Pardini (2):
>       arm64: dts: rockchip: describe PCIe Ethernet controllers on NanoPC-T6
>       arm64: dts: rockchip: fix PCIe regulator name on NanoPC-T6
> 
>  arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi | 36 ++++++++++++++++++++--
>  1 file changed, 33 insertions(+), 3 deletions(-)
> ---
> base-commit: e7ae89a0c97ce2b68b0983cd01eda67cf373517d
> change-id: 20260524-rk3588-dts-rtl-eth-describe-dt-alias-c1ed187b7c50
> 
> Best regards,
> --  
> Ricardo Pardini <[email-masked]>
> 
>