[PATCH master] net: am65-cpsw-nuss: fix up PHY mode for fixed RGMII TX delay

[Sascha Hauer]

On Wed, 25 Feb 2026 15:02:49 +0100, Ahmad Fatoum wrote:
> To restore compatibility with newer Linux device trees and fix network
> breakage on Beagleplay, import following U-Boot commit:
> 
> | commit 4b10bcfdef9cb544ca80988fe36d307a622bcd21
> | Author:     Matthias Schiffer <matthias.schiffer at ew.tq-group.com>
> | AuthorDate: Tue Sep 30 10:05:11 2025 +0200
> | Commit:     Tom Rini <trini at konsulko.com>
> | CommitDate: Fri Oct 10 11:07:44 2025 -0600
> |
> |     net: ethernet: ti: am65-cpsw: fix up PHY mode for fixed RGMII TX delay
> |
> |     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 at ew.tq-group.com>
> 
> [...]

Applied, thanks!

[1/1] net: am65-cpsw-nuss: fix up PHY mode for fixed RGMII TX delay
      https://git.pengutronix.de/cgit/barebox/commit/?id=810120e81a95 (link may not be stable)

Best regards,
-- 
Sascha Hauer <s.hauer at pengutronix.de>