reproduce:
        git checkout 4dc1d1bec89864d8076e5ab314f86f46442bfb02
        b4 shazam https://lore.kernel.org/r/20250213-for_upstream-v2-1-ec4eff3b3cd5@analog.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs