reproduce:
        git remote add broonie-sound https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
        git fetch broonie-sound for-next
        git checkout broonie-sound/for-next
        b4 shazam https://lore.kernel.org/r/20240814175129.4027097-1-Frank.Li@nxp.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs