Please refer to the following section in arch/arm/dts/fsl-ls1046a.dtsi in u-boot source code.
duart0: serial@21c0500 {
compatible = "fsl,ns16550", "ns16550a";
reg = <0x00 0x21c0500 0x0 0x100>;
interrupts = <0 54 0x4>;
clocks = <&clockgen 4 0>;
};
duart1: serial@21c0600 {
compatible = "fsl,ns16550", "ns16550a";
reg = <0x00 0x21c0600 0x0 0x100>;
interrupts = <0 54 0x4>;
clocks = <&clockgen 4 0>;
};
duart2: serial@21d0500 {
compatible = "fsl,ns16550", "ns16550a";
reg = <0x0 0x21d0500 0x0 0x100>;
interrupts = <0 55 0x4>;
clocks = <&clockgen 4 0>;
};
duart3: serial@21d0600 {
compatible = "fsl,ns16550", "ns16550a";
reg = <0x0 0x21d0600 0x0 0x100>;
interrupts = <0 55 0x4>;
clocks = <&clockgen 4 0>;
};
