ARM: at91/dt: at91sam9x5: enable iio touchscreen for 9x5ek

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91sam9x5.dtsi

@@ -68,7 +68,7 @@ main_xtal: main_xtal {
 		adc_op_clk: adc_op_clk{
 			compatible = "fixed-clock";
 			#clock-cells = <0>;
-			clock-frequency = <5000000>;
+			clock-frequency = <1000000>;
 		};
 	};
 
@@ -1043,6 +1043,7 @@ adc0: adc@f804c000 {
 				atmel,adc-channels-used = <0xffff>;
 				atmel,adc-vref = <3300>;
 				atmel,adc-startup-time = <40>;
+				atmel,adc-sample-hold-time = <11>;
 				atmel,adc-res = <8 10>;
 				atmel,adc-res-names = "lowres", "highres";
 				atmel,adc-use-res = "highres";

arch/arm/boot/dts/at91sam9x5ek.dtsi

@@ -100,6 +100,12 @@ ov2640_0: endpoint {
 				};
 			};
 
+			adc0: adc@f804c000 {
+				atmel,adc-ts-wires = <4>;
+				atmel,adc-ts-pressure-threshold = <10000>;
+				status = "okay";
+			};
+
 			pinctrl@fffff400 {
 				camera_sensor {
 					pinctrl_pck0_as_isi_mck: pck0_as_isi_mck-0 {