airoha: add nodes for 3rd PCIe line for AN7581

Some SoC might use the Serdes for the second USB port as a 3rd PCIe
line (with the SSTR register correctly setup).

Add the node for the 3rd PCIe card and enable for the eMMC RFB board.

Signed-off-by: Christian Marangi <[email protected]>

target/linux/airoha/dts/an7581-evb-emmc.dts

@@ -57,6 +57,13 @@
 		};
 	};
 
+	pcie2_rst_pins: pcie2-rst-pins {
+		conf {
+			pins = "pcie_reset2";
+			drive-open-drain = <1>;
+		};
+	};
+
 	gswp1_led0_pins: gswp1-led0-pins {
 		mux {
 			function = "phy1_led0";
@@ -156,6 +163,12 @@
 	status = "okay";
 };
 
+&pcie2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pcie2_rst_pins>;
+	status = "okay";
+};
+
 &mdio {
 	as21xx_1: ethernet-phy@1d {
 		compatible = "ethernet-phy-ieee802.3-c45";

target/linux/airoha/dts/an7581.dtsi

@@ -718,6 +718,49 @@
 			};
 		};
 
+		pcie2: pcie@1fc40000 {
+			compatible = "airoha,en7581-pcie";
+			device_type = "pci";
+			linux,pci-domain = <2>;
+			#address-cells = <3>;
+			#size-cells = <2>;
+
+			reg = <0x0 0x1fc40000 0x0 0x1670>;
+			reg-names = "pcie-mac";
+
+			clocks = <&scuclk EN7523_CLK_PCIE>;
+			clock-names = "sys-ck";
+
+			phys = <&pciephy>;
+			phy-names = "pcie-phy";
+
+			ranges = <0x02000000 0 0x28000000 0x0 0x28000000 0 0x4000000>;
+
+			resets = <&scuclk EN7581_PCIE0_RST>,
+				 <&scuclk EN7581_PCIE1_RST>,
+				 <&scuclk EN7581_PCIE2_RST>;
+			reset-names = "phy-lane0", "phy-lane1", "phy-lane2";
+
+			mediatek,pbus-csr = <&pbus_csr 0x10 0x14>;
+
+			interrupts = <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>;
+			bus-range = <0x00 0xff>;
+			#interrupt-cells = <1>;
+			interrupt-map-mask = <0 0 0 7>;
+			interrupt-map = <0 0 0 1 &pcie_intc2 0>,
+					<0 0 0 2 &pcie_intc2 1>,
+					<0 0 0 3 &pcie_intc2 2>,
+					<0 0 0 4 &pcie_intc2 3>;
+
+			status = "disabled";
+
+			pcie_intc2: interrupt-controller {
+				interrupt-controller;
+				#address-cells = <0>;
+				#interrupt-cells = <1>;
+			};
+		};
+
 		npu: npu@1e900000 {
 			compatible = "airoha,en7581-npu";
 			reg = <0x0 0x1e900000 0x0 0x313000>;