Hi all,

This series adds PTP support for the KSZ8463.

The KSZ8463 differs quite a lot from other KSZ switches supporting PTP:
it has a different interrupt logic and a different 'PTP engine'.

This second iteration addresses most of the Sashiko comments of the v1.
In [1] I said I would re-order the patches to please Sashiko but in fact
it would lead to 'unused function' warnings so I finally decided to keep
this order.

Patches 1 to 4 add interrupt support for the KSZ8463
Patches 5 to 10 add the PTP support for the KSZ8463

[1]: https://lore.kernel.org/r/20260709-ksz-new-ptp-v1-0-344f02fe739e@bootlin.com (local)

Signed-off-by: Bastien Curutchet (Schneider Electric) <redacted>
---
Changes in v2:
- PATCH 1:
  - Modify the commit log to explain why IRQ setup isn't done on KSZ8463
- PATCH 4:
  - Fix the error code path in ksz8463_ptp_port_irq_setup().
  - Change the IRQ request/free orders to register/unregister the top level
    handler first/last
- PATCH 8:
  - Free the skb if its linearization fails
  - Downgrade ip_summed to CHECKSUM_NONE when clearing the reserved
    field of the PTP header
- PATCH 10:
  - Ensure the skb is linearized before accessing the PTP header
- Link to v1: https://lore.kernel.org/r/20260709-ksz-new-ptp-v1-0-344f02fe739e@bootlin.com (local)

---
Bastien Curutchet (Schneider Electric) (10):
      net: dsa: microchip: implement ksz8463_setup()
      net: dsa: microchip: split ksz8_config_cpu_port()
      net: dsa: microchip: allow the use of other IRQ operations.
      net: dsa: microchip: add PTP interrupt handling for KSZ8463
      net: dsa: microchip: adapt port offset for KSZ8463's PTP register
      net: dsa: tag_ksz: move the KSZ8795 tag handling below ksz_xmit_timestamp()
      net: dsa: tag_ksz: share code for KSZ8795 and KSZ9893 xmit operations
      net: dsa: microchip: add KSZ8463 tail tag handling
      net: dsa: microchip: explicitly enable detection of L2 PTP frames
      net: dsa: microchip: add two-steps PTP support for KSZ8463

 drivers/net/dsa/microchip/ksz8.c        | 311 +++++++++++++++++++++++++++-----
 drivers/net/dsa/microchip/ksz8_reg.h    |   1 +
 drivers/net/dsa/microchip/ksz_common.c  |  15 +-
 drivers/net/dsa/microchip/ksz_common.h  |   6 +
 drivers/net/dsa/microchip/ksz_ptp.c     | 266 ++++++++++++++++++++++++++-
 drivers/net/dsa/microchip/ksz_ptp.h     |  16 ++
 drivers/net/dsa/microchip/ksz_ptp_reg.h |  10 +
 include/net/dsa.h                       |   2 +
 net/dsa/tag_ksz.c                       | 232 +++++++++++++++---------
 9 files changed, 721 insertions(+), 138 deletions(-)
---
base-commit: a6cfd2762eb18cde4eb34906599ffa7b07c2ed60
change-id: 20260708-ksz-new-ptp-f98db30a8a4f

Best regards,
-- 
Bastien Curutchet (Schneider Electric) [off-list ref]