boards: opta: ADC support

A valid device tree configuration is provided for the ADCs of the 8 input
channels and the sample adc_dt works out of the box. Obviously this is
not the only possible configuration but it provides a good template for
further customization without the need to lookup the ADC GPIOs and
connections in the schematics.

Signed-off-by: Federico Di Gregorio <fog@dndg.it>

boards/arduino/opta/arduino_opta-common.dtsi

@@ -103,3 +103,101 @@
 		re-gpios = <&gpiob 13 GPIO_ACTIVE_LOW>;
 	};
 };
+
+&adc1 {
+	pinctrl-0 = <&adc1_inp0_pa0_c &adc1_inp6_pf12>;
+	pinctrl-names = "default";
+	st,adc-clock-source = <SYNC>;
+	st,adc-prescaler = <4>;
+	vref-mv = <10000>;
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	a0: channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <16>;
+	};
+
+	a2: channel@6 {
+		reg = <6>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <16>;
+	};
+
+};
+
+&adc2 {
+	pinctrl-0 = <&adc2_inp9_pb0>;
+	pinctrl-names = "default";
+	st,adc-clock-source = <SYNC>;
+	st,adc-prescaler = <4>;
+	vref-mv = <10000>;
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	a3: channel@9 {
+		reg = <9>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <16>;
+	};
+};
+
+&adc3 {
+	pinctrl-0 = <&adc3_inp6_pf10 &adc3_inp7_pf8 &adc3_inp8_pf6 &adc3_inp9_pf4 &adc3_inp0_pc2_c>;
+	pinctrl-names = "default";
+	st,adc-clock-source = <SYNC>;
+	st,adc-prescaler = <4>;
+	vref-mv = <10000>;
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	a1: channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <16>;
+	};
+
+	a4: channel@6 {
+		reg = <6>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <16>;
+	};
+
+	a5: channel@7 {
+		reg = <7>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <16>;
+	};
+
+	a6: channel@8 {
+		reg = <8>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <16>;
+	};
+
+	a7: channel@9 {
+		reg = <9>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <16>;
+	};
+};

samples/drivers/adc/adc_dt/boards/arduino_opta_stm32h747xx_m7.overlay

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2021 STMicroelectronics
+ * Copyright (c) 2024 DNDG srl
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		io-channels =
+			<&adc1 0>, /* I1 */
+			<&adc3 0>, /* I2 */
+			<&adc1 6>, /* I3 */
+			<&adc2 9>, /* I4 */
+			<&adc3 6>, /* I5 */
+			<&adc3 7>, /* I6 */
+			<&adc3 8>, /* I7 */
+			<&adc3 9>; /* I8 */
+	};
+};
+
+&adc1 {
+	status ="okay";
+};
+
+&adc2 {
+	status ="okay";
+};
+
+&adc3 {
+	status = "okay";
+};