arm64: dts: imx8mn: Enable Asynchronous Sample Rate Converter

The driver exists for the Enhanced Asynchronous Sample Rate Converter
(EASRC) Controller, but there isn't a device tree entry for it.

On the vendor kernel, they put this on a spba-bus for SDMA support.

Add the node for the spba-bus with the easrc node inside.

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mn.dtsi

@@ -253,6 +253,34 @@
 			#size-cells = <1>;
 			ranges;
 
+			spba: bus@30000000 {
+				compatible = "fsl,spba-bus", "simple-bus";
+				#address-cells = <1>;
+				#size-cells = <1>;
+				reg = <0x30000000 0x100000>;
+				ranges;
+
+				easrc: easrc@300c0000 {
+					compatible = "fsl,imx8mn-easrc";
+					reg = <0x300c0000 0x10000>;
+					interrupts = <GIC_SPI 122 IRQ_TYPE_LEVEL_HIGH>;
+					clocks = <&clk IMX8MN_CLK_ASRC_ROOT>;
+					clock-names = "mem";
+					dmas = <&sdma2 16 23 0> , <&sdma2 17 23 0>,
+					       <&sdma2 18 23 0> , <&sdma2 19 23 0>,
+					       <&sdma2 20 23 0> , <&sdma2 21 23 0>,
+					       <&sdma2 22 23 0> , <&sdma2 23 23 0>;
+					dma-names = "ctx0_rx", "ctx0_tx",
+						    "ctx1_rx", "ctx1_tx",
+						    "ctx2_rx", "ctx2_tx",
+						    "ctx3_rx", "ctx3_tx";
+					firmware-name = "imx/easrc/easrc-imx8mn.bin";
+					fsl,asrc-rate  = <8000>;
+					fsl,asrc-format = <2>;
+					status = "disabled";
+				};
+			};
+
 			gpio1: gpio@30200000 {
 				compatible = "fsl,imx8mn-gpio", "fsl,imx35-gpio";
 				reg = <0x30200000 0x10000>;