boards: arduino: uno_r4: Add ADC, PWM, I2C, SPI, and TRNG

Add support for basic peripherals.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

boards/arduino/uno_r4/arduino_uno_r4-pinctrl.dtsi

@@ -16,4 +16,32 @@
 			psels = <RA_PSEL(RA_PSEL_SCI_2, 3, 1)>;
 		};
 	};
+
+	iic1_default: iic1_default {
+		group1 {
+			/* SCL1 SDA1 */
+			psels = <RA_PSEL(RA_PSEL_I2C, 1, 0)>,
+				<RA_PSEL(RA_PSEL_I2C, 1, 1)>;
+			drive-strength = "medium";
+		};
+	};
+
+	adc0_default: adc0_default {
+		group1 {
+			/* input */
+			psels = <RA_PSEL(RA_PSEL_ADC, 0,  9)>,
+				<RA_PSEL(RA_PSEL_ADC, 0,  0)>,
+				<RA_PSEL(RA_PSEL_ADC, 0,  1)>,
+				<RA_PSEL(RA_PSEL_ADC, 0,  2)>;
+			renesas,analog-enable;
+		};
+	};
+
+	pwm7_default: pwm7_default {
+		group1 {
+			/* GTIOC7A GTIOC7B */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 3, 4)>,
+				<RA_PSEL(RA_PSEL_GPT1, 3, 3)>;
+		};
+	};
 };

boards/arduino/uno_r4/arduino_uno_r4.dts

@@ -20,6 +20,7 @@
 		zephyr,shell-uart = &uart2;
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
+		zephyr,entropy = &trng;
 		zephyr,code-partition = &code_partition;
 	};
 };
@@ -28,7 +29,7 @@
 	status = "okay";
 	pinctrl-0 = <&sci2_default>;
 	pinctrl-names = "default";
-	interrupts = <4 1>, <5 1>, <6 1>, <7 1>;
+	interrupts = <0 1>, <1 1>, <2 1>, <3 1>;
 	interrupt-names = "rxi", "txi", "tei", "eri";
 
 	uart2: uart {
@@ -41,6 +42,12 @@
 	status = "okay";
 };
 
+&adc0 {
+	status = "okay";
+	pinctrl-0 = <&adc0_default>;
+	pinctrl-names = "default";
+};
+
 &port_irq0 {
 	interrupts = <27 12>;
 	status = "okay";
@@ -51,6 +58,29 @@
 	status = "okay";
 };
 
+&trng {
+	status = "okay";
+};
+
+&pwm7 {
+	pinctrl-0 = <&pwm7_default>;
+	pinctrl-names = "default";
+	interrupts = <8 1>, <9 1>;
+	interrupt-names = "gtioca", "overflow";
+	status = "okay";
+};
+
+&iic1 {
+	pinctrl-0 = <&iic1_default>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	clock-frequency = <DT_FREQ_M(1)>;
+	interrupts = <10 1>, <11 1>, <12 1>, <13 1>;
+	interrupt-names = "rxi", "txi", "tei", "eri";
+	status = "okay";
+};
+
 &flash0 {
 	partitions {
 		compatible = "fixed-partitions";

boards/arduino/uno_r4/arduino_uno_r4_minima-pinctrl.dtsi

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2023 TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&pinctrl {
+	spi1_default: spi1_default {
+		group1 {
+			/* MOSI MISO RSPCK SSL */
+			psels = <RA_PSEL(RA_PSEL_SPI, 1,  9)>,
+				<RA_PSEL(RA_PSEL_SPI, 1, 10)>,
+				<RA_PSEL(RA_PSEL_SPI, 1, 11)>,
+				<RA_PSEL(RA_PSEL_SPI, 1, 12)>;
+		};
+	};
+};

boards/arduino/uno_r4/arduino_uno_r4_minima.overlay

@@ -4,6 +4,11 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include "arduino_uno_r4_minima-pinctrl.dtsi"
+
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/ra_pwm.h>
+
 / {
 	model = "Arduino Uno R4 Minima";
 
@@ -14,8 +19,18 @@
 		};
 	};
 
+	pwm_leds {
+		compatible = "pwm-leds";
+		status = "disabled";
+		pwm_led: pwm_led {
+			pwms = <&pwm3 0 PWM_MSEC(1) PWM_POLARITY_NORMAL>;
+			label = "PWM_LED";
+		};
+	};
+
 	aliases {
 		led0 = &led;
+		pwm-led0 = &pwm_led;
 	};
 
 	arduino_header: connector {
@@ -47,3 +62,14 @@
 			   <21 0 &ioport1 0 0>;   /* D15 */
 	};
 };
+
+&spi1 {
+	pinctrl-0 = <&spi1_default>;
+	pinctrl-names = "default";
+	interrupts = <28 1>, <29 1>, <30 1>, <31 1>;
+	interrupt-names = "rxi", "txi", "tei", "eri";
+	status = "okay";
+};
+
+arduino_i2c: &iic1 {};
+arduino_spi: &spi1 {};

boards/arduino/uno_r4/arduino_uno_r4_minima.yaml

@@ -7,5 +7,8 @@ toolchain:
   - gnuarmemb
 ram: 32
 supported:
+  - adc
   - gpio
+  - pwm
+  - spi
   - uart

boards/arduino/uno_r4/arduino_uno_r4_wifi-pinctrl.dtsi

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2024 TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&pinctrl {
+	iic0_default: iic0_default {
+		group1 {
+			/* SCL0 SDA0 */
+			psels = <RA_PSEL(RA_PSEL_I2C, 4, 0)>,
+				<RA_PSEL(RA_PSEL_I2C, 4, 1)>;
+			drive-strength = "medium";
+		};
+	};
+
+	spi0_default: spi0_default {
+		group1 {
+			/* MOSI MISO RSPCK SSL */
+			psels = <RA_PSEL(RA_PSEL_SPI, 4, 11)>,
+				<RA_PSEL(RA_PSEL_SPI, 4, 10)>,
+				<RA_PSEL(RA_PSEL_SPI, 1,  2)>,
+				<RA_PSEL(RA_PSEL_SPI, 1,  3)>;
+		};
+	};
+};

boards/arduino/uno_r4/arduino_uno_r4_wifi.overlay

@@ -4,6 +4,11 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include "arduino_uno_r4_wifi-pinctrl.dtsi"
+
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/ra_pwm.h>
+
 / {
 	model = "Arduino Uno R4 WiFi";
 
@@ -14,8 +19,18 @@
 		};
 	};
 
+	pwm_leds {
+		compatible = "pwm-leds";
+		status = "disabled";
+		pwm_led: pwm_led {
+			pwms = <&pwm2 1 PWM_MSEC(1) PWM_POLARITY_NORMAL>;
+			label = "PWM_LED";
+		};
+	};
+
 	aliases {
 		led0 = &led;
+		pwm-led0 = &pwm_led;
 	};
 
 	arduino_header: connector {
@@ -47,3 +62,26 @@
 			   <21 0 &ioport1 0 0>;   /* D15 */
 	};
 };
+
+&spi0 {
+	pinctrl-0 = <&spi0_default>;
+	pinctrl-names = "default";
+	interrupts = <28 1>, <29 1>, <30 1>, <31 1>;
+	interrupt-names = "rxi", "txi", "tei", "eri";
+	status = "okay";
+};
+
+&iic0 {
+	pinctrl-0 = <&iic0_default>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	clock-frequency = <DT_FREQ_M(1)>;
+	interrupts = <14 1>, <15 1>, <16 1>, <17 1>;
+	interrupt-names = "rxi", "txi", "tei", "eri";
+	status = "okay";
+};
+
+qwiic_i2c: &iic0 {};
+arduino_i2c: &iic1 {};
+arduino_spi: &spi0 {};

boards/arduino/uno_r4/arduino_uno_r4_wifi.yaml

@@ -7,5 +7,8 @@ toolchain:
   - gnuarmemb
 ram: 32
 supported:
+  - adc
   - gpio
+  - pwm
+  - spi
   - uart

samples/basic/blinky_pwm/boards/arduino_uno_r4_r7fa4m1ab3cfm_minima.overlay

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/ra_pwm.h>
+
+/ {
+	leds {
+		status = "disabled";
+	};
+
+	pwm_leds {
+		status = "okay";
+	};
+};
+
+&pinctrl {
+	pwm3_default: pwm3_default {
+		group1 {
+			/* GTIOC3A */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 1, 11)>;
+		};
+	};
+};
+
+&pwm3 {
+	pinctrl-0 = <&pwm3_default>;
+	pinctrl-names = "default";
+	interrupts = <30 1>, <31 1>;
+	interrupt-names = "gtioca", "overflow";
+	status = "okay";
+	divider = <RA_PWM_SOURCE_DIV_1024>;
+};

samples/basic/blinky_pwm/boards/arduino_uno_r4_r7fa4m1ab3cfm_wifi.overlay

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/ra_pwm.h>
+
+/ {
+	leds {
+		status = "disabled";
+	};
+
+	pwm_leds {
+		status = "okay";
+	};
+};
+
+&pinctrl {
+	pwm2_default: pwm2_default {
+		group1 {
+			/* GTIOC2B */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 1, 2)>;
+		};
+	};
+};
+
+&pwm2 {
+	pinctrl-0 = <&pwm2_default>;
+	pinctrl-names = "default";
+	interrupts = <30 1>, <31 1>;
+	interrupt-names = "gtioca", "overflow";
+	status = "okay";
+	divider = <RA_PWM_SOURCE_DIV_1024>;
+};

samples/basic/fade_led/boards/arduino_uno_r4_r7fa4m1ab3cfm_minima.overlay

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/ra_pwm.h>
+
+/ {
+	leds {
+		status = "disabled";
+	};
+
+	pwm_leds {
+		status = "okay";
+	};
+};
+
+&pinctrl {
+	pwm3_default: pwm3_default {
+		group1 {
+			/* GTIOC3A */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 1, 11)>;
+		};
+	};
+};
+
+&pwm3 {
+	pinctrl-0 = <&pwm3_default>;
+	pinctrl-names = "default";
+	interrupts = <30 1>, <31 1>;
+	interrupt-names = "gtioca", "overflow";
+	status = "okay";
+	divider = <RA_PWM_SOURCE_DIV_1024>;
+};

samples/basic/fade_led/boards/arduino_uno_r4_r7fa4m1ab3cfm_wifi.overlay

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/ra_pwm.h>
+
+/ {
+	leds {
+		status = "disabled";
+	};
+
+	pwm_leds {
+		status = "okay";
+	};
+};
+
+&pinctrl {
+	pwm2_default: pwm2_default {
+		group1 {
+			/* GTIOC2B */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 1, 2)>;
+		};
+	};
+};
+
+&pwm2 {
+	pinctrl-0 = <&pwm2_default>;
+	pinctrl-names = "default";
+	interrupts = <30 1>, <31 1>;
+	interrupt-names = "gtioca", "overflow";
+	status = "okay";
+	divider = <RA_PWM_SOURCE_DIV_1024>;
+};

samples/drivers/adc/adc_dt/boards/arduino_uno_r4.overlay

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		io-channels = <&adc0 0>, <&adc0 1>, <&adc0 2>, <&adc0 9>;
+	};
+};
+
+&adc0 {
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,resolution = <12>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,vref-mv = <5000>;
+	};
+
+	channel@1 {
+		reg = <1>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,resolution = <12>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,vref-mv = <5000>;
+	};
+
+	channel@2 {
+		reg = <2>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,resolution = <12>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,vref-mv = <5000>;
+	};
+
+	channel@9 {
+		reg = <9>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,resolution = <12>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,vref-mv = <5000>;
+	};
+};

samples/drivers/led/pwm/boards/arduino_uno_r4_r7fa4m1ab3cfm_minima.conf

@@ -0,0 +1,3 @@
+CONFIG_BLINK_DELAY_SHORT=20
+CONFIG_BLINK_DELAY_LONG=65
+CONFIG_FADE_DELAY=15

samples/drivers/led/pwm/boards/arduino_uno_r4_r7fa4m1ab3cfm_minima.overlay

@@ -0,0 +1,30 @@
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/ra_pwm.h>
+
+/ {
+	leds {
+		status = "disabled";
+	};
+
+	pwm_leds {
+		status = "okay";
+	};
+};
+
+&pinctrl {
+	pwm3_default: pwm3_default {
+		group1 {
+			/* GTIOC3A */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 1, 11)>;
+		};
+	};
+};
+
+&pwm3 {
+	pinctrl-0 = <&pwm3_default>;
+	pinctrl-names = "default";
+	interrupts = <30 1>, <31 1>;
+	interrupt-names = "gtioca", "overflow";
+	status = "okay";
+	divider = <RA_PWM_SOURCE_DIV_1024>;
+};

samples/drivers/led/pwm/boards/arduino_uno_r4_r7fa4m1ab3cfm_wifi.conf

@@ -0,0 +1,3 @@
+CONFIG_BLINK_DELAY_SHORT=20
+CONFIG_BLINK_DELAY_LONG=65
+CONFIG_FADE_DELAY=15

samples/drivers/led/pwm/boards/arduino_uno_r4_r7fa4m1ab3cfm_wifi.overlay

@@ -0,0 +1,30 @@
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/ra_pwm.h>
+
+/ {
+	leds {
+		status = "disabled";
+	};
+
+	pwm_leds {
+		status = "okay";
+	};
+};
+
+&pinctrl {
+	pwm2_default: pwm2_default {
+		group1 {
+			/* GTIOC2B */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 1, 2)>;
+		};
+	};
+};
+
+&pwm2 {
+	pinctrl-0 = <&pwm2_default>;
+	pinctrl-names = "default";
+	interrupts = <30 1>, <31 1>;
+	interrupt-names = "gtioca", "overflow";
+	status = "okay";
+	divider = <RA_PWM_SOURCE_DIV_1024>;
+};

tests/drivers/adc/adc_api/boards/arduino_uno_r4.overlay

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		io-channels = <&adc0 0>, <&adc0 1>;
+	};
+};
+
+&adc0 {
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,resolution = <12>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,vref-mv = <5000>;
+	};
+
+	channel@1 {
+		reg = <1>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,resolution = <12>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,vref-mv = <5000>;
+	};
+};

tests/drivers/pwm/pwm_loopback/boards/arduino_uno_r4.overlay

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/ra_pwm.h>
+
+/ {
+	pwm_loopback_0 {
+		compatible = "test-pwm-loopback";
+		/* first index must be a 32-Bit timer */
+		pwms = <&pwm0 0 0 PWM_POLARITY_NORMAL>,
+			<&pwm7 0 0 PWM_POLARITY_NORMAL>;
+	};
+};
+
+&pinctrl {
+	pwm0_default: pwm0_default {
+		group1 {
+			/* GTIOC0A */
+			psels = <RA_PSEL(RA_PSEL_GPT1, 1, 7)>;
+		};
+	};
+};
+
+&pwm0 {
+	pinctrl-0 = <&pwm0_default>;
+	pinctrl-names = "default";
+	interrupts = <30 1>, <31 1>;
+	interrupt-names = "gtioca", "overflow";
+	status = "okay";
+};

tests/drivers/spi/spi_loopback/boards/arduino_uno_r4_r7fa4m1ab3cfm_minima.overlay

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&spi1 {
+	rx-dtc;
+	tx-dtc;
+
+	slow@0 {
+		compatible = "test-spi-loopback-slow";
+		reg = <0>;
+		spi-max-frequency = <2000000>;
+	};
+
+	fast@0 {
+		compatible = "test-spi-loopback-fast";
+		reg = <0>;
+		spi-max-frequency = <3000000>;
+	};
+};

tests/drivers/spi/spi_loopback/boards/arduino_uno_r4_r7fa4m1ab3cfm_wifi.overlay

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&spi0 {
+	rx-dtc;
+	tx-dtc;
+
+	slow@0 {
+		compatible = "test-spi-loopback-slow";
+		reg = <0>;
+		spi-max-frequency = <2000000>;
+	};
+
+	fast@0 {
+		compatible = "test-spi-loopback-fast";
+		reg = <0>;
+		spi-max-frequency = <3000000>;
+	};
+};