reproduce:
        # https://github.com/dlech/linux/commit/9a48214781dd8525063938516a2a00ffb7b3c23c
        git remote add dlech https://github.com/dlech/linux
        git fetch --no-tags dlech b4/iio-adc-ti-ads122c14
        git checkout 9a48214781dd8525063938516a2a00ffb7b3c23c
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs