reproduce:
        git checkout 8856d7fe1758937ac528770f552ec58c388c255b
        b4 shazam https://lore.kernel.org/r/20260126-ltc3220-driver-v4-1-c59517206c24@analog.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs