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The am65-cpsw driver currently sets the SEL_RGMII_IDMODE flag in a MAC's mode register to enable or disable the TX delay. While this was supported for earlier generations of the CPSW controller, the datasheets of all modern TI SoCs using the am65-cpsw MAC state that the TX delay is fixed, and the SEL_RGMII_IDMODE bit is documented as reserved in most of them. Furthermore, while it was found that this bit does in fact disable the TX delay, [1] states that this setting is truly unsupported by TI and not just undocumented. Following the clarification of the rgmii* phy-mode values in the Linux DT bindings in [2], the Linux am65-cpsw driver was changed in [3] to account for the fixed TX delay by fixing up the mode passed to the PHY driver; a similar fixup already existed in the TI icssg-prueth driver. [4] followed up on this by explicitly clearing the SEL_RGMII_IDMODE flag to handle the case where it is set by the bootloader or other firmware before Linux. With the above changes, Device Trees that set the recommended "rgmii-id" mode are now appearing in Linux 6.17+. Avoid setting the unsupported SEL_RGMII_IDMODE flag for such Device Trees, and instead fix up the PHY interface mode, thus aligning the U-Boot driver with the Linux kernel. [1] https://www.spinics.net/lists/netdev/msg1112647.html [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 [4] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a22d3b0d49d411e64ed07e30c2095035ecb30ed2 Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>