[net-next v4 0/3] net: dsa: yt921x: Add support for Motorcomm YT921x

[David Yang <mmyangfl@gmail.com>]

Motorcomm YT921x is a series of ethernet switches developed by Shanghai
Motorcomm Electronic Technology, including:

  - YT9215S / YT9215RB / YT9215SC: 5 GbE phys
  - YT9213NB / YT9214NB: 2 GbE phys
  - YT9218N / YT9218MB: 8 GbE phys

and up to 2 serdes interfaces.

This patch adds basic support for a working DSA switch.

v3: https://lore.kernel.org/r/20250816052323.360788-1-mmyangfl@gmail.com
  - fix words and warnings in dt binding
  - remove unnecessary dev_warn_ratelimited and u64_from_u32
  - remove lag and mst
  - check for mdio results and fix a unlocked write in conduit_state_change
v2: https://lore.kernel.org/r/20250814065032.3766988-1-mmyangfl@gmail.com
  - fix words in dt binding
  - add support for lag and mst
v1: https://lore.kernel.org/r/20250808173808.273774-1-mmyangfl@gmail.com
  - fix coding style
  - add dt binding
  - add support for fdb, vlan and bridge

David Yang (3):
  dt-bindings: net: dsa: yt921x: Add Motorcomm YT921x switch support
  net: dsa: tag_yt921x: add support for Motorcomm YT921x tags
  net: dsa: yt921x: Add support for Motorcomm YT921x

 .../bindings/net/dsa/motorcomm,yt921x.yaml    |  162 +
 drivers/net/dsa/Kconfig                       |    7 +
 drivers/net/dsa/Makefile                      |    1 +
 drivers/net/dsa/yt921x.c                      | 3584 +++++++++++++++++
 include/net/dsa.h                             |    2 +
 net/dsa/Kconfig                               |    6 +
 net/dsa/Makefile                              |    1 +
 net/dsa/tag_yt921x.c                          |  128 +
 8 files changed, 3891 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/dsa/motorcomm,yt921x.yaml
 create mode 100644 drivers/net/dsa/yt921x.c
 create mode 100644 net/dsa/tag_yt921x.c

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2.50.1