arm: dts: mediatek: add PCIe node for MT7981

Add PCIe node for MT7981 with all the required properties to make PCIe
work.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
diff --git a/arch/arm/dts/mt7981.dtsi b/arch/arm/dts/mt7981.dtsi
index 2360c6b..5b4cadc 100644
--- a/arch/arm/dts/mt7981.dtsi
+++ b/arch/arm/dts/mt7981.dtsi
@@ -339,6 +339,41 @@
 		status = "okay";
 	};
 
+	pcie: pcie@11280000 {
+		compatible = "mediatek,mt8192-pcie";
+		device_type = "pci";
+		reg = <0x11280000 0x4000>;
+		reg-names = "pcie-mac";
+		#address-cells = <3>;
+		#size-cells = <2>;
+		interrupts = <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&infracfg CLK_INFRA_IPCIE_CK>,
+				<&infracfg CLK_INFRA_IPCIE_PIPE_CK>,
+				<&infracfg CLK_INFRA_IPCIER_CK>,
+				<&infracfg CLK_INFRA_IPCIEB_CK>;
+		clock-names = "pl_250m", "tl_26m", "peri_26m", "top_133m";
+		phys = <&u3port0 PHY_TYPE_PCIE>;
+		phy-names = "pcie-phy";
+		bus-range = <0x00 0xff>;
+		ranges = <0x82000000 0 0x20000000 0x20000000 0 0x10000000>;
+
+		#interrupt-cells = <1>;
+
+		interrupt-map-mask = <0 0 0 7>;
+		interrupt-map = <0 0 0 1 &pcie_intc 0>,
+			<0 0 0 2 &pcie_intc 1>,
+			<0 0 0 3 &pcie_intc 2>,
+			<0 0 0 4 &pcie_intc 3>;
+
+		status = "disabled";
+
+		pcie_intc: interrupt-controller {
+			interrupt-controller;
+			#interrupt-cells = <1>;
+			#address-cells = <0>;
+		};
+	};
+
 	usbtphy: usb-phy@11e10000 {
 		compatible = "mediatek,mt7981",
 			     "mediatek,generic-tphy-v2";