Hi, > + uart0: serial@30002000 { According to the reference manual of the bl808, this is uart3. Can we also use that name here? > + compatible = "bouffalolab,bl808-uart"; > + reg = <0x30002000 0x1000>; > + interrupts = <20 IRQ_TYPE_LEVEL_HIGH>; > + clocks = <&xtal>; This is a shortcut and is likely to change in the future. The xtal isn't really connected to the uart block, but instead there is a clock mux and clock gate in between. > + status = "disabled"; > + }; Thanks, -michael