reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/broonie/ci.git/commit/?id=e54a168d41145e7d83d9d53ade47aa0da71029e4
        git remote add broonie-ci https://git.kernel.org/pub/scm/linux/kernel/git/broonie/ci.git
        git fetch --no-tags broonie-ci v3_20250414_rf_asoc_add_codec_driver_for_cirrus_logic_cs48l32_dsp
        git checkout e54a168d41145e7d83d9d53ade47aa0da71029e4
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs