boards: renesas: Add ADC device node for EK-RA2A1 board

Add ADC device node on board layer to support ADC 16-bit on EK-RA2A1

Signed-off-by: Thinh Le Cong <[email protected]>

Author: Thinh Le Cong

boards/renesas/ek_ra2a1/ek_ra2a1-pinctrl.dtsi

@@ -45,6 +45,14 @@
 		};
 	};
 
+	adc0_default: adc0_default {
+		group1 {
+			/* input */
+			psels = <RA_PSEL(RA_PSEL_ADC, 5, 0)>;
+			renesas,analog-enable;
+		};
+	};
+
 	dac0_default: dac0_default {
 		group1 {
 			/* output */

boards/renesas/ek_ra2a1/ek_ra2a1.dts

@@ -7,6 +7,7 @@
 
 #include <renesas/ra/ra2/r7fa2a1ab3cfm.dtsi>
 #include <zephyr/dt-bindings/gpio/gpio.h>
+#include <zephyr/dt-bindings/adc/adc.h>
 #include <zephyr/dt-bindings/input/input-event-codes.h>
 
 #include "ek_ra2a1-pinctrl.dtsi"
@@ -119,6 +120,12 @@
 	status = "okay";
 };
 
+&adc0 {
+	status = "okay";
+	pinctrl-0 = <&adc0_default>;
+	pinctrl-names = "default";
+};
+
 &dac0 {
 	pinctrl-0 = <&dac0_default>;
 	pinctrl-names = "default";