reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git/commit/?id=420a1e2763b5df3ed90f92d97cf30fe43822bba8
        git remote add sre-power-supply https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git
        git fetch --no-tags sre-power-supply for-next
        git checkout 420a1e2763b5df3ed90f92d97cf30fe43822bba8
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs