Hi @Oitsh.1 ,
Since you are using a SIP, I recommand you use in priority the SIP provider support channel.
Anyway, this is some few hints I get from expert that may be relevant for you :
MDIO/MDC in maily used to discuss and configure PHY. Using a switch you needn't to use MDIOs pins BUT, you have to use an I2C connection to discuss with. This discussion is split in two:
1- register access to configure switch
2- Mdio bus interface to establish PHY features of the switch (autoneg/ link state..)
In both cases you use 2 wires. There are not muxed as MDIO but they do quite the same.
Now concerning MACto MAC and linux, it's possible to do it.
In your devicetree you have to declare a fixed-link node in your gmac node.
See Documentation/devicetree/bindings/net/dsa/dsa.txt and Documentation/devicetree/bindings/net/ethernet-controller.yaml for more details.
You will not able to configure PHY/switch, or you will not be able to execute ethtool to change some settings.
Olivier
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