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

[Ricardo Pardini via B4 Relay]

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.

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.

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/20260525-rk3588-dts-rtl-eth-describe-dt-alias-v1-1-a6fcda563ac7@pardini.net

[1] https://sashiko.dev/#/patchset/20260525-rk3588-dts-rtl-eth-describe-dt-alias-v1-1-a6fcda563ac7%40pardini.net

To: Rob Herring <robh at kernel.org>
To: Krzysztof Kozlowski <krzk+dt at kernel.org>
To: Conor Dooley <conor+dt at kernel.org>
To: Heiko Stuebner <heiko at sntech.de>
Cc: Sebastian Reichel <sebastian.reichel at collabora.com>
Cc: devicetree at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-rockchip at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
Signed-off-by: Ricardo Pardini <ricardo at pardini.net>

---
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 <ricardo at pardini.net>