ARM: dts: imx6qdl-sabresd: add egalax touch screen support on i2c2 bus

Add egalax touch screen support on i2c2 bus, it is connected
to LVDS0, while the existing one on i2c3 bus is connected to
LVDS1.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-sabresd.dtsi

@@ -272,6 +272,16 @@ &i2c2 {
 	pinctrl-0 = <&pinctrl_i2c2>;
 	status = "okay";
 
+	touchscreen@4 {
+		compatible = "eeti,egalax_ts";
+		reg = <0x04>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_i2c2_egalax_int>;
+		interrupt-parent = <&gpio6>;
+		interrupts = <8 IRQ_TYPE_EDGE_FALLING>;
+		wakeup-gpios = <&gpio6 8 GPIO_ACTIVE_HIGH>;
+	};
+
 	ov5640: camera@3c {
 		compatible = "ovti,ov5640";
 		pinctrl-names = "default";
@@ -498,6 +508,12 @@ MX6QDL_PAD_KEY_ROW3__I2C2_SDA		0x4001b8b1
 			>;
 		};
 
+		pinctrl_i2c2_egalax_int: i2c2egalaxintgrp {
+			fsl,pins = <
+				MX6QDL_PAD_NANDF_ALE__GPIO6_IO08	0x1b0b0
+			>;
+		};
+
 		pinctrl_i2c3: i2c3grp {
 			fsl,pins = <
 				MX6QDL_PAD_GPIO_3__I2C3_SCL		0x4001b8b1