reproduce (this is a W=1 build):
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch linux-review Andrea-della-Porta/dt-bindings-pwm-Add-Raspberry-Pi-RP1-PWM-controller/20260929-150211
        git checkout linux-review/Andrea-della-Porta/dt-bindings-pwm-Add-Raspberry-Pi-RP1-PWM-controller/20260929-150211
        b4 shazam https://lore.kernel.org/r/0d2249a66732bfce38a2260bee08cd1ba4097e51.1792748690.git.andrea.porta@suse.com

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=xtensa olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=xtensa SHELL=/bin/bash