It is recommended to try the package rocm-amd-opencl first.

If it does not work, this package provides the AMD OpenCL proprietary driver
for graphic cards prior Vega generation.
Not being able to list all compatible models, a GPU architecture more recent
than GCN 2nd generation might be required, with at least OpenCL 2.0 support.
Arctic Islands/Polaris series have worked, so far.

This package does not contain the AMD OpenCL library itself.
The software is automatically downloaded from AMD official website
during package installation.