Thank you for your reply. But I don't think the device tree section of section 7.16 matches p2020 because in the manual for p2020, the register offset address in srio is c0000. And I'm not sure that the individual nodes of the device tree in the reference section are compatible with p2020.
Please refer to arch/powerpc/boot/dts/fsl/qoriq-rmu-0.dtsi