Which registers to use to enable RGMII2 on the MT7621

I have my own original device. A bit like Mqmaker WITI. I look at the RGMII interface with an oscilloscope and see the signals from the PHY side. On the processor side, I was able to achieve only the output of the GE2_TXCLK signal - by writing the value 0x2107Е33В to the GE2_MAC_CONTROL register (address 0x1Е110200). I don’t understand how to connect RGMII2 to the 5th port of MT7530.