arm64: dts: zynqmp: Add DPDMA node

Add a DT node for the DisplayPort DMA engine (DPDMA).
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/3d11015512a085592f2aca76eeddc04178d38bbe.1611232558.git.michal.simek@xilinx.com

arch/arm64/boot/dts/xilinx/zynqmp-clk-ccf.dtsi

@@ -227,3 +227,7 @@ &watchdog0 {
 &lpd_watchdog {
 	clocks = <&zynqmp_clk LPD_WDT>;
 };
+
+&zynqmp_dpdma {
+	clocks = <&zynqmp_clk DPDMA_REF>;
+};

arch/arm64/boot/dts/xilinx/zynqmp.dtsi

@@ -847,5 +847,15 @@ lpd_watchdog: watchdog@ff150000 {
 			reg = <0x0 0xff150000 0x0 0x1000>;
 			timeout-sec = <10>;
 		};
+
+		zynqmp_dpdma: dma-controller@fd4c0000 {
+			compatible = "xlnx,zynqmp-dpdma";
+			status = "disabled";
+			reg = <0x0 0xfd4c0000 0x0 0x1000>;
+			interrupts = <0 122 4>;
+			interrupt-parent = <&gic>;
+			clock-names = "axi_clk";
+			#dma-cells = <1>;
+		};
 	};
 };