reproduce:
        git remote add broonie-spi https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git
        git fetch broonie-spi for-next
        git checkout broonie-spi/for-next
        b4 shazam https://lore.kernel.org/r/20241013223907.2459099-4-chris.packham@alliedtelesis.co.nz
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs