reproduce (this is a W=1 build):
        git remote add broonie-regulator https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git
        git fetch broonie-regulator for-next
        git checkout broonie-regulator/for-next
        b4 shazam https://lore.kernel.org/r/20260323062737.886728-8-lakshay.piplani@nxp.com

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um olddefconfig
        make W=1 O=build_dir ARCH=um SHELL=/bin/bash drivers/i3c/hub/