reproduce:
        git checkout 0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53
        b4 shazam https://lore.kernel.org/r/20260708-ti-dma-crossbar-v1-1-f62796428f13@gmail.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs