ARM: dts: imx6: RDU2: Add Switch interrupts

The Marvell switch has its interrupt pin connected to a GPIO
line. Wire this up in the device tree. This then allows us to use
interrupts from the embedded Ethernet PHYs in the switch. Also wire
them up in device tree.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Chris Healy <cphealy@gmail.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi

@@ -630,13 +630,19 @@ mdio {
 		#size-cells = <0>;
 		status = "okay";
 
-		switch@0 {
+		switch: switch@0 {
 			compatible = "marvell,mv88e6085";
+			pinctrl-0 = <&pinctrl_switch_irq>;
+			pinctrl-names = "default";
 			#address-cells = <1>;
 			#size-cells = <0>;
 			reg = <0>;
 			dsa,member = <0 0>;
 			eeprom-length = <512>;
+			interrupt-parent = <&gpio6>;
+			interrupts = <3 IRQ_TYPE_EDGE_FALLING>;
+			interrupt-controller;
+			#interrupt-cells = <2>;
 
 			ports {
 				#address-cells = <1>;
@@ -645,11 +651,13 @@ ports {
 				port@0 {
 					reg = <0>;
 					label = "gigabit_proc";
+					phy-handle = <&switchphy0>;
 				};
 
 				port@1 {
 					reg = <1>;
 					label = "netaux";
+					phy-handle = <&switchphy1>;
 				};
 
 				port@2 {
@@ -666,11 +674,48 @@ fixed-link {
 				port@3 {
 					reg = <3>;
 					label = "netright";
+					phy-handle = <&switchphy3>;
 				};
 
 				port@4 {
 					reg = <4>;
 					label = "netleft";
+					phy-handle = <&switchphy4>;
+				};
+			};
+
+			mdio {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				switchphy0: switchphy@0 {
+					reg = <0>;
+					interrupt-parent = <&switch>;
+					interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+				};
+
+				switchphy1: switchphy@1 {
+					reg = <1>;
+					interrupt-parent = <&switch>;
+					interrupts = <1 IRQ_TYPE_LEVEL_HIGH>;
+				};
+
+				switchphy2: switchphy@2 {
+					reg = <2>;
+					interrupt-parent = <&switch>;
+					interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
+				};
+
+				switchphy3: switchphy@3 {
+					reg = <3>;
+					interrupt-parent = <&switch>;
+					interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
+				};
+
+				switchphy4: switchphy@4 {
+					reg = <4>;
+					interrupt-parent = <&switch>;
+					interrupts = <4 IRQ_TYPE_LEVEL_HIGH>;
 				};
 			};
 		};
@@ -891,6 +936,12 @@ MX6QDL_PAD_EIM_D30__GPIO3_IO30		0x40010000
 		>;
 	};
 
+	pinctrl_switch_irq: switchgrp {
+		fsl,pins = <
+			MX6QDL_PAD_CSI0_DAT17__GPIO6_IO03	0x4001b000
+		>;
+	};
+
 	pinctrl_tc358767: tc358767grp {
 		fsl,pins = <
 			MX6QDL_PAD_GPIO_9__GPIO1_IO09		0x10