I used rawhide.
sudo dnf group install development-tools
git clone --single-branch --branch rk3588s-radxa-cm5-rpi-cm4-io --depth 1 https://github.com/ndoo/linux.git%%%%
make defconfig
make -j$(nproc) dtbs
sudo cp arch/arm64/boot/dts/rockchip/rk3588s-radxa-cm5*.dtb /boot/dtb/rockchip/