Please refer to the Chapter 12 in the Porting guide.
https://www.nxp.com.cn/docs/en/user-guide/IMX_PORTING_GUIDE.pdf
And take the evk's dtsi file for reference.
https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm64/boot/dts?h=imx_5.4.70_2.3.0