OpenCL userspace driver as provided in the amdgpu-pro driver stack. This package is intended to work along with the free amdgpu stack for fedora. Similiar to https://aur.archlinux.org/packages/opencl-amd/
git clone https://github.com/sukhmeetbawa/OpenCL-AMD-Fedora.git
cd ./OpenCL-AMD-Fedora
./opencl-amd.sh
Screenshots that opencl is succesfully installed.
https://www.reddit.com/r/Fedora/comments/m2il41/guide_installing_opencl_alongside_mesa_drivers/
https://www.reddit.com/r/Fedora/comments/nprppu/guide_workaround_to_install_amdgpupro_opencl/