Hi,
I had some discussion with our ethernet driver team.
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Your link is not up in above dmesg.
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Linux kernel drivers does not have support for 88Q2112/88Q2122 PHYs because of licensing issues. Thus, you need to contact Marvell to provide the driver and build it to configure the mdio.
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After configure it, you can add “Fixed-link” to your device tree and let the application from (1) to send data.