reproduce:
        git checkout 75f2c0b3690702c90863c2e138cb5520670845ea
        b4 shazam https://lore.kernel.org/r/20260819-pmic5000-v1-1-e5e0ddcf0863@stevetech.au
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs