ARM: dts: at91: sama5d27_wlsom1_ek: add ADC node

Add node for ADC and pincontrol for it

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

Author: ehristev

arch/arm/boot/dts/at91-sama5d27_wlsom1_ek.dts

@@ -63,6 +63,14 @@
 	};
 };
 
+&adc {
+	vddana-supply = <&vdd_3v3>;
+	vref-supply = <&vdd_3v3>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_adc_default>;
+	status = "okay";
+};
+
 &flx0 {
 	atmel,flexcom-mode = <ATMEL_FLEXCOM_MODE_USART>;
 	status = "okay";
@@ -103,6 +111,21 @@
 };
 
 &pioA {
+	/*
+	 * There is no real pinmux for ADC, if the pin
+	 * is not requested by another peripheral then
+	 * the muxing is done when channel is enabled.
+	 * Requesting pins for ADC is GPIO is
+	 * encouraged to prevent conflicts and to
+	 * disable bias in order to be in the same
+	 * state when the pin is not muxed to the adc.
+	 */
+	pinctrl_adc_default: adc_default {
+		pinmux = <PIN_PD25__GPIO>,
+			 <PIN_PD26__GPIO>;
+		bias-disable;
+	};
+
 	pinctrl_flx0_default: flx0_usart_default {
 		pinmux = <PIN_PB28__FLEXCOM0_IO0>,
 			 <PIN_PB29__FLEXCOM0_IO1>;