ARM: dts: am437x: Add touchscreen support for GP EVM

Add touchscreen support for AM437x GP EVM using pixcir
touchscreen controller.

CC: Benoit Cousson <bcousson@baylibre.com>
CC: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Acked-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am437x-gp-evm.dts

@@ -81,6 +81,12 @@ ecap0_pins: backlight_pins {
 			0x164 MUX_MODE0       /* eCAP0_in_PWM0_out.eCAP0_in_PWM0_out MODE0 */
 		>;
 	};
+
+	pixcir_ts_pins: pixcir_ts_pins {
+		pinctrl-single,pins = <
+			0x264 (PIN_INPUT_PULLUP | MUX_MODE7)  /* spi2_d0.gpio3_22 */
+		>;
+	};
 };
 
 &i2c0 {
@@ -93,6 +99,20 @@ &i2c1 {
         status = "okay";
         pinctrl-names = "default";
         pinctrl-0 = <&i2c1_pins>;
+
+	pixcir_ts@5c {
+		compatible = "pixcir,pixcir_tangoc";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pixcir_ts_pins>;
+		reg = <0x5c>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <22 0>;
+
+		attb-gpio = <&gpio3 22 GPIO_ACTIVE_HIGH>;
+
+		x-size = <1024>;
+		y-size = <600>;
+	};
 };
 
 &epwmss0 {