Following a discussion on the LKML [1], there has been a clarification of the correct use of the rgmii(/-rxid/-txid/-it) phy-modes [2] - namely, that they don't describe the interface at the MAC or PHY boundary, but whether the PCB traces add delays or not (where it is implementation-defined whether the delays are added on the MAC or PHY side in the latter case).
Accordingly, a fixup has been implemented in the am65-cpsw-nuss driver to make it follow the clarified rules [3]; apply the same change to U-Boot. Backwards compatibility is preserved: using an old DTB with the wrong phy-mode only results in a warning message, but keeps the Ethernet working. With a new DTB from Linux 6.17+ that sets the mode to rgmii-id, these changes are necessary to avoid using an unsupported/ reserved configuration. See the commit message of patch 2/2 for some additional detail. [1] https://lore.kernel.org/lkml/[email protected]/ [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c360eb0c3ccb95306704fd221442283ee82f1f58 [3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca13b249f291f4920466638d1adbfb3f9c8db6e9 I'm not sure whether this should go into master or next - if no DTS from Linux 6.17+ are imported in the v2025.10 cycle, next is probably sufficient. Matthias Schiffer (2): net: mdio-uclass: introduce dm_eth_phy_connect_interface() net: ethernet: ti: am65-cpsw: fix up PHY mode for fixed RGMII TX delay drivers/net/ti/am65-cpsw-nuss.c | 35 ++++++++++++++++++++------------- include/miiphy.h | 15 ++++++++++++++ net/mdio-uclass.c | 18 ++++++----------- 3 files changed, 42 insertions(+), 26 deletions(-) -- TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany Amtsgericht München, HRB 105018 Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider https://www.tq-group.com/
