Status of the Panfrost driver

Does anyone know what is the status of the Panfrost driver?

A few years ago there was a request to add it to the source tree, https://reviews.freebsd.org/D34370.
However, it was closed with a very short summary "Out of tree drivers exists for panfrost so include it."
No rationale for the decision.
How do comitters decided whether some driver shall be merged into the source tree or not.

Does anyone use the out of tree drvier?
What is your experience, is it stable?

Best regards,
Michał Kruszewski

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