ARM: dts: at91-sama5d2_icp: add ADC node and it's pincontrol

Add the node for ADC and the corresponding pinctrl.
Only channels 5,6,7 are available on this board as external pins.
ADTRG is also available as external trigger.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>

Author: ehristev

arch/arm/boot/dts/at91-sama5d2_icp.dts

@@ -262,7 +262,7 @@
 						lpm-gpios = <&pioBU 7 GPIO_ACTIVE_LOW>;
 
 						regulators {
-							VDD_IO {
+							vdd_io_reg: VDD_IO {
 								regulator-name = "VDD_IO";
 								regulator-min-microvolt = <1200000>;
 								regulator-max-microvolt = <3700000>;
@@ -373,6 +373,14 @@
 				};
 			};
 
+			adc: adc@fc030000 {
+				vddana-supply = <&vdd_io_reg>;
+				vref-supply = <&vdd_io_reg>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&pinctrl_adc_default &pinctrl_adtrg_default>;
+				status = "okay";
+			};
+
 			macb0: ethernet@f8008000 {
 				status = "okay";
 				pinctrl-names = "default";
@@ -414,6 +422,26 @@
 			};
 
 			pinctrl@fc038000 {
+				pinctrl_adc_default: adc_default {
+					pinmux = <PIN_PD24__GPIO>,
+						 <PIN_PD25__GPIO>,
+						 <PIN_PD26__GPIO>;
+					bias-disable;
+				};
+				/*
+				 * The ADTRG pin can work on any edge type.
+				 * In here it's being pulled up, so need to
+				 * connect it to ground to get an edge e.g.
+				 * Trigger can be configured on falling, rise
+				 * or any edge, and the pull-up can be changed
+				 * to pull-down or left floating according to
+				 * needs.
+				 */
+				pinctrl_adtrg_default: adtrg_default {
+					pinmux = <PIN_PD31__ADTRG>;
+					bias-pull-up;
+				};
+
 				pinctrl_flx4_default: flx4_default {
 					pinmux = <PIN_PC28__FLEXCOM4_IO0>,
 						 <PIN_PC29__FLEXCOM4_IO1>;