> sorry, "U-Boot need gpio pin" > I didn't know how to overwrite it. thank you. You can look at the two files: rk3568-rock-3b.dts rk3568-pinctrl.dtsi > <3 RK_PC1 RK_FUNC_GPIO &pcfg_pull_none> > <2 RK_PD6 RK_FUNC_GPIO &pcfg_pull_none> So this is only needed by uboot? Thanks, Chukun -- 2.25.1