Porting Marvell 88E1512 for custom Stratix 10 SX board

Hi everyone,
Does anybody knows how to edit the dts for configuring 88E1512 Marvell PHY chip on U-boot and also in the Kernel? I am using 88E1512 in SGMII mode.
I have tried to change the socfpga_stratix10_socdk.dts and “socfpga_stratix10.dtsi” without any luck.