Merge branch 'net-dsa-lantiq_gswip-add-support-for-maxlinear-gsw1xx-switch-family'

Daniel Golle says:

====================
net: dsa: lantiq_gswip: Add support for MaxLinear GSW1xx switch family

This patch series extends the existing lantiq_gswip DSA driver to
support the MaxLinear GSW1xx family of dedicated Ethernet switch ICs.
These switches are based on the same IP as the Lantiq/Intel GSWIP found
in VR9 and xRX MIPS router SoCs which are currently supported by the
lantiq_gswip driver, but they are dedicated ICs connected via MDIO
rather than built-in components of a SoC accessible via memory-mapped
I/O.

The series includes several improvements and refactoring to implement
support for GSW1xx switch ICs by reusing the existing lantiq_gswip
driver.

The GSW1xx family includes several variants:
 - GSW120: 4 ports, 2 PHYs, RGMII & SGMII/2500Base-X
 - GSW125: 4 ports, 2 PHYs, RGMII & SGMII/2500Base-X, industrial temperature
 - GSW140: 6 ports, 4 PHYs, RGMII & SGMII/2500Base-X
 - GSW141: 6 ports, 4 PHYs, RGMII & SGMII
 - GSW145: 6 ports, 4 PHYs, RGMII & SGMII/2500Base-X, industrial temperature

Key features implemented:
 - MDIO-based register access using regmap
 - Support for SGMII/1000Base-X/2500Base-X SerDes interfaces
 - Configurable RGMII delays via device tree properties
 - Configurable RMII clock direction
 - Energy Efficient Ethernet (EEE) support
 - enabling/disabling learning
====================

Link: https://patch.msgid.link/cover.1762170107.git.daniel@makrotopia.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>