net: dsa: MT7628 embedded switch initial support

Hi all,

This RFC series adds initial support for the MT7628 Embedded Switch.

The implementation provides basic functionality required to operate the
switch using DSA. The hardware exposes 5 internal Fast Ethernet ports
and a Gigabit port which is internally connected to the CPU MAC.

This version aims to be functionally complete and attempts to address
all feedback received on the previous versions. 

Tested on a MT7628NN based board.

RFC:

I would like to transition this series toward a proper PATCH submission
as it seems that the feedback on the last RFC did not point out major
issues. As this is my first driver submission, I would greatly appreciate
any guidance on what should be addressed before it is appropriate to
send this in as a PATCH.

Thank you for your time and review.

---

v3:
	- add DTS bindings for mediatek,mt7628-esw
	- update tagging driver to use htons instead of manual byte swapping
	- remove port 5 from config as it doesn't exist in the hardware
	- fix code formatting
	- add helper macros for configuring packed VLAN table registers
	- fix mac_capabilities for cpu port, replace supported_interfaces
	  with PHY_INTERFACE_INTERNAL to accurately reflect the hardware
	- update MEDIATEK_GE_SOC_PHY tristate name, fix sorting
	- remove unneeded PHY_PACKAGE from MEDIATEK_FE_SOC_PHY Kconfig
	- remove untested features from mtk-fe-soc.c phy driver

v2: https://lore.kernel.org/netdev/20260314150845.653866-1-jo...
	- Update commit messages with more relevant information
	- Change all references of "special" tag to "MT7628" tag
	- Fix coding style errors
	- Use dsa_xmit_port_mask instead of BIT(dp->index)
	- Replace phy_read/phy_write with an MDIO bus definition
	- Remove PHY init from switch driver
	- Fix undocumented writes to SGC2 and FCT0
	- Fix missing double-tag enable required for VLAN unaware
	  functionality
	- Fix VLAN remove logic
	- Update VLAN add logic to use the first unused slot
	- Add a dedicated phy driver for MT7628 FE PHYs

v1: https://lore.kernel.org/netdev/20260228185242.800836-1-jo...

Joris Vaisvila (4):
  dt-bindings: net: dsa: add MT7628 ESW
  net: phy: mediatek: add phy driver for MT7628 built-in Fast Ethernet
    PHYs
  net: dsa: initial MT7628 tagging driver
  net: dsa: initial support for MT7628 embedded switch

 .../bindings/net/dsa/mediatek,mt7628-esw.yaml | 136 ++++
 drivers/net/dsa/Kconfig                       |   7 +
 drivers/net/dsa/Makefile                      |   1 +
 drivers/net/dsa/mt7628.c                      | 634 ++++++++++++++++++
 drivers/net/phy/mediatek/Kconfig              |  10 +-
 drivers/net/phy/mediatek/Makefile             |   1 +
 drivers/net/phy/mediatek/mtk-fe-soc.c         |  50 ++
 include/net/dsa.h                             |   2 +
 net/dsa/Kconfig                               |   6 +
 net/dsa/Makefile                              |   1 +
 net/dsa/tag_mt7628.c                          |  92 +++
 11 files changed, 939 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/net/dsa/mediatek,mt7628-esw.yaml
 create mode 100644 drivers/net/dsa/mt7628.c
 create mode 100644 drivers/net/phy/mediatek/mtk-fe-soc.c
 create mode 100644 net/dsa/tag_mt7628.c

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2.53.0