arm64: dts: ls1028a: add missing SPI nodes

The LS1028A has three (dual) SPI controller. These are compatible with
the ones from the LS1021A. Add the nodes.

The third controller was tested on a custom board.
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi

@@ -290,6 +290,45 @@ fspi: spi@20c0000 {
 			status = "disabled";
 		};
 
+		dspi0: spi@2100000 {
+			compatible = "fsl,ls1028a-dspi", "fsl,ls1021a-v1.0-dspi";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x0 0x2100000 0x0 0x10000>;
+			interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
+			clock-names = "dspi";
+			clocks = <&clockgen 4 1>;
+			spi-num-chipselects = <4>;
+			little-endian;
+			status = "disabled";
+		};
+
+		dspi1: spi@2110000 {
+			compatible = "fsl,ls1028a-dspi", "fsl,ls1021a-v1.0-dspi";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x0 0x2110000 0x0 0x10000>;
+			interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
+			clock-names = "dspi";
+			clocks = <&clockgen 4 1>;
+			spi-num-chipselects = <4>;
+			little-endian;
+			status = "disabled";
+		};
+
+		dspi2: spi@2120000 {
+			compatible = "fsl,ls1028a-dspi", "fsl,ls1021a-v1.0-dspi";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x0 0x2120000 0x0 0x10000>;
+			interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
+			clock-names = "dspi";
+			clocks = <&clockgen 4 1>;
+			spi-num-chipselects = <3>;
+			little-endian;
+			status = "disabled";
+		};
+
 		esdhc: mmc@2140000 {
 			compatible = "fsl,ls1028a-esdhc", "fsl,esdhc";
 			reg = <0x0 0x2140000 0x0 0x10000>;