Hi pengduanhuan
for mipi-csi one can look at linux documentation, sect.6.1.4 MIPI Camera Serial Interface (MIPI CSI)
and nxp linux sources in source.codeaurora.org/external/imx/linux-imx repository:
https://source.codeaurora.org/external/imx/linux-imx/tree/?h=imx_5.4.70_2.3.0
Best regards
igor