Why doesn't jetson have the directory of "/dev/dri/drm"?

Why doesn’t jetson have the directory of “/dev/dri/drm”?
And how to open("/dev/dri/drm");

We don’t access the device node in our drm implementation. The implementation is built in libdrm_nvdc.so and linked to libdrm.so like:

lrwxrwxrwx 1 root root    11 May 11  2020 /usr/lib/aarch64-linux-gnu/libdrm.so -> libdrm.so.2
lrwxrwxrwx 1 root root    14 Mar  9 02:02 /usr/lib/aarch64-linux-gnu/libdrm.so.2 -> libdrm_nvdc.so

Please refer to NvDrmRenderer.cpp for using drm. It is not required to open the device node.

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