What is the release you are using? Is it Kernel-4.9 or Kernel-5.10?
If you are using kernel-4.9, please add the following
phys = <&p2u_8>,
<&p2u_9>;
phy-names = "pcie-p2u-0", "pcie-p2u-1";
If you are using Kernel-5.10, add the following instead
phys = <&p2u_hsio_8>,
<&p2u_hsio_9>;
phy-names = "p2u-0", "p2u-1";
Please also share the log and describe the new issue if it doesn’t work after making the above changes.