Simon Polack fce07ce378 generic: net: phy: realtek: apply SerDes lane polarity on RTL8261C/D
The Gemtek W1700K routes the USXGMII lanes between the AN7581 and its
RTL8261CE inverted and describes that in the device tree, but nothing in
the RTL8261C/D driver reads tx-polarity/rx-polarity and the Airoha PCS
has no polarity handling of its own. The copper side negotiates normally
while the SerDes never trains and the netdev stays NO-CARRIER.

Add a read and a read-modify-write helper for the VEND1 SerDes command
window and program the lane polarity from rtl8261x_config_init().

Submitted upstream as part of a series documenting the RTL8261C/D device
tree bindings and adding SerDes lane polarity and LED support.

Apply it ahead of the out-of-tree
742-net-phy-realtek-add-5G-and-10G-PHY-support.patch so it can be carried
exactly as submitted. 742 drops its own select PHY_COMMON_PROPS and its
phy-common-props.h include, as both come from here now. Once accepted
upstream this patch only moves to backports, so they stay dropped.

Refresh out-of-tree patches in realtek target.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Simon Polack <spolack+git@mailbox.org>
Link: https://github.com/openwrt/openwrt/pull/25092
Signed-off-by: Jonas Jelonek <jonas@jonasjelonek.de>
2026-09-24 09:33:30 +02:00
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