boards: renesas: Add I2C support for Renesas RA4, RA2 boards

Add I2C support for: ek_ra4w1, ek_ra4m2, ek_ra4m3, ek_ra2a1

Signed-off-by: Tri Nguyen <tri.nguyen.wj@bp.renesas.com>
Signed-off-by: Khoa Nguyen <khoa.nguyen.xh@renesas.com>

boards/renesas/ek_ra2a1/doc/index.rst

@@ -86,6 +86,8 @@ hardware features:
 +-----------+------------+-------------------------------+
 | ENTROPY   | on-chip    | entropy                       |
 +-----------+------------+-------------------------------+
+| I2C       | on-chip    | i2c                           |
++-----------+------------+-------------------------------+
 
 The default configuration can be found in
 :zephyr_file:`boards/renesas/ek_ra2a1/ek_ra2a1_defconfig`

boards/renesas/ek_ra2a1/ek_ra2a1-pinctrl.dtsi

@@ -34,4 +34,13 @@
 				<RA_PSEL(RA_PSEL_GPT1, 4, 7)>;
 		};
 	};
+
+	iic0_default: iic0_default {
+		group1 {
+			/* SCL0 SDA0 */
+			psels = <RA_PSEL(RA_PSEL_I2C, 0, 0)>,
+			<RA_PSEL(RA_PSEL_I2C, 4, 1)>;
+			drive-strength = "medium";
+		};
+	};
 };

boards/renesas/ek_ra2a1/ek_ra2a1.dts

@@ -98,3 +98,14 @@
 &trng {
 	status = "okay";
 };
+
+&iic0 {
+	pinctrl-0 = <&iic0_default>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	clock-frequency = <DT_FREQ_M(1)>;
+	interrupts = <0 1>, <1 1>, <2 1>, <3 1>;
+	interrupt-names = "rxi", "txi", "tei", "eri";
+	status = "okay";
+};

boards/renesas/ek_ra4m2/doc/index.rst

@@ -106,6 +106,8 @@ The below features are currently supported on Zephyr OS for EK-RA4M2 board:
 +-----------+------------+----------------------+
 | PWM       | on-chip    | pwm                  |
 +-----------+------------+----------------------+
+| I2C       | on-chip    | i2c                  |
++-----------+------------+----------------------+
 
 Other hardware features are currently not supported by the port.
 

boards/renesas/ek_ra4m2/ek_ra4m2-pinctrl.dtsi

@@ -37,4 +37,13 @@
 				<RA_PSEL(RA_PSEL_GPT1, 1, 4)>;
 		};
 	};
+
+	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";
+		};
+	};
 };

boards/renesas/ek_ra4m2/ek_ra4m2.dts

@@ -124,3 +124,14 @@
 	interrupt-names = "gtioca", "overflow";
 	status = "okay";
 };
+
+&iic0 {
+	pinctrl-0 = <&iic0_default>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	clock-frequency = <DT_FREQ_M(1)>;
+	interrupts = <87 1>, <88 1>, <89 1>, <90 1>;
+	interrupt-names = "rxi", "txi", "tei", "eri";
+	status = "okay";
+};

boards/renesas/ek_ra4m3/doc/index.rst

@@ -108,6 +108,8 @@ The below features are currently supported on Zephyr OS for EK-RA4M3 board:
 +-----------+------------+----------------------+
 | PWM       | on-chip    | pwm                  |
 +-----------+------------+----------------------+
+| I2C       | on-chip    | i2c                  |
++-----------+------------+----------------------+
 
 Other hardware features are currently not supported by the port.
 

boards/renesas/ek_ra4m3/ek_ra4m3-pinctrl.dtsi

@@ -37,4 +37,13 @@
 				<RA_PSEL(RA_PSEL_GPT1, 1, 10)>;
 		};
 	};
+
+	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";
+		};
+	};
 };

boards/renesas/ek_ra4m3/ek_ra4m3.dts

@@ -124,3 +124,14 @@
 	interrupt-names = "gtioca", "overflow";
 	status = "okay";
 };
+
+&iic0 {
+	pinctrl-0 = <&iic0_default>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	clock-frequency = <DT_FREQ_M(1)>;
+	interrupts = <87 1>, <88 1>, <89 1>, <90 1>;
+	interrupt-names = "rxi", "txi", "tei", "eri";
+	status = "okay";
+};

boards/renesas/ek_ra4w1/doc/index.rst

@@ -100,6 +100,8 @@ The below features are currently supported on Zephyr OS for EK-RA4W1 board:
 +-----------+------------+----------------------+
 | PWM       | on-chip    | pwm                  |
 +-----------+------------+----------------------+
+| I2C       | on-chip    | i2c                  |
++-----------+------------+----------------------+
 
 Other hardware features are currently not supported by the port.
 

boards/renesas/ek_ra4w1/ek_ra4w1-pinctrl.dtsi

@@ -37,4 +37,13 @@
 				<RA_PSEL(RA_PSEL_GPT1, 1, 4)>;
 		};
 	};
+
+	iic0_default: iic0_default {
+		group1 {
+			/* SCL0 SDA0 */
+			psels = <RA_PSEL(RA_PSEL_I2C, 4, 7)>,
+			<RA_PSEL(RA_PSEL_I2C, 2, 4)>;
+			drive-strength = "medium";
+		};
+	};
 };

boards/renesas/ek_ra4w1/ek_ra4w1.dts

@@ -101,3 +101,14 @@
 	interrupt-names = "gtioca", "overflow";
 	status = "okay";
 };
+
+&iic0 {
+	pinctrl-0 = <&iic0_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";
+};