[PATCH net-next v2 0/3] Follow-up to RGMII mode clarification: am65-cpsw fix + checkpatch

[Matthias Schiffer <matthias.schiffer@ew.tq-group.com>]

Following previous discussion [1] and the documentation update by
Andrew [2]:

Fix up the mode to account for the fixed TX delay on the AM65 CPSW
Ethernet controllers, similar to the way the icssg-prueth does it. For
backwards compatibility, the "impossible" modes that claim to have a
delay on the PCB are still accepted, but trigger a warning message.

As Andrew suggested, I have also added a checkpatch check that requires
a comment for any RGMII mode that is not "rgmii-id".

No Device Trees are updated to avoid the warning for now, to give other
projects syncing the Linux Device Trees some time to fix their drivers
as well. I intend to submit an equivalent change for U-Boot's
am65-cpsw-nuss driver as soon as the changes are accepted for Linux.

Changelog v2:

- Previous patch 1/4 has been dropped, has it has been replaced by [2]
- Patches 1/3, 2/3: collected review and ack tags
- Patch 3/3:
  - Fixed multiple typos noted during review
  - Extended to check .dtso in addition to .dts and .dtsi
  - Changed CHK() to WARN(), so the warning triggers without --strict

[1] https://lore.kernel.org/lkml/d25b1447-c28b-4998-b238-92672434dc28@lunn.ch/
[2] https://lore.kernel.org/all/20250430-v6-15-rc3-net-rgmii-delays-v2-1-099ae651d5e5@lunn.ch/
    commit c360eb0c3ccb ("dt-bindings: net: ethernet-controller: Add informative text about RGMII delays")
Patch series v1: https://lore.kernel.org/all/cover.1744710099.git.matthias.schiffer@ew.tq-group.com/


Matthias Schiffer (3):
  dt-bindings: net: ti: k3-am654-cpsw-nuss: update phy-mode in example
  net: ethernet: ti: am65-cpsw: fixup PHY mode for fixed RGMII TX delay
  checkpatch: check for comment explaining rgmii(|-rxid|-txid) PHY modes

 Documentation/dev-tools/checkpatch.rst        |  9 +++++++
 .../bindings/net/ti,k3-am654-cpsw-nuss.yaml   |  2 +-
 drivers/net/ethernet/ti/am65-cpsw-nuss.c      | 27 +++++++++++++++++--
 scripts/checkpatch.pl                         | 12 +++++++++
 4 files changed, 47 insertions(+), 3 deletions(-)

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