default or selected kernelversion does not have config value CONFIG_DRM_RZG2L_USE_MIPI_DSI.
Result is shown for kernelversion 6.16-rc7

RZ/G2L MIPI DSI Encoder Support

configname: CONFIG_DRM_RZG2L_USE_MIPI_DSI

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>Device Tree and Open Firmware support
└─>RZ/G2L MIPI DSI Encoder Support
In linux kernel since version 6.1.145 (release Date: 2025-07-14)  
Enable support for the RZ/G2L Display Unit embedded MIPI DSI encoders.


is selected by
CONFIG_DRM_RZG2L_MIPI_DSI