[PATCH 0/3] Add support for dual port USXGMII+SGMII

[Gokul Praveen]

This patch series enables dual port USXGMII and SGMII Ethernet mode
support on the TI J784S4 EVM platform using the CPSW9G Ethernet switch.

The CPSW9G instance supports both SGMII and USXGMII modes simultaneously
on MAC Ports 1 and 2, which connect to ENET Expansion 1 and ENET
Expansion 2 slots through the SERDES2 instance. The series includes:

1. A fix to the SERDES2 node to add the missing PLL1 refclk, which is
   required for multilink SERDES configuration to function properly.

2. A driver fix for the am65-cpsw Ethernet driver to properly configure
   the MAC in SGMII mode according to the CPSGMII Module specification,
   including correct advertisement ability register settings and master
   mode configuration.

3. Device tree overlay support for two board configurations:
   - Board 1: Port 1 in SGMII mode (1Gbps) + Port 2 in USXGMII mode (5Gbps)
   - Board 2: Port 1 in USXGMII mode (5Gbps) + Port 2 in SGMII mode (1Gbps)

Both configurations use fixed-link mode and provide flexible multi-speed
networking options for the J784S4 platform.

Boot logs:

https://gist.github.com/GokulPraveen2001/7a09cc5ed0151d264f32cbbc31896605

Gokul Praveen (3):
  arm64: dts: ti: Add PLL1 refclk to J784S4 SoC SERDES node
  net: ethernet: ti: am65-cpsw: Fix MAC configuration for SGMII mode
  arm64: dts: ti: k3-j784s4: Add overlay for dual port USXGMII+SGMII
    mode

 arch/arm64/boot/dts/ti/Makefile               | 11 ++-
 ...s4-evm-sgmii-usxgmii-exp1-exp2_board1.dtso | 97 +++++++++++++++++++
 ...s4-evm-usxgmii-sgmii-exp1-exp2_board2.dtso | 97 +++++++++++++++++++
 arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi    |  3 +-
 drivers/net/ethernet/ti/am65-cpsw-nuss.c      |  7 +-
 5 files changed, 209 insertions(+), 6 deletions(-)
 create mode 100644 arch/arm64/boot/dts/ti/k3-j784s4-evm-sgmii-usxgmii-exp1-exp2_board1.dtso
 create mode 100644 arch/arm64/boot/dts/ti/k3-j784s4-evm-usxgmii-sgmii-exp1-exp2_board2.dtso

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2.34.1