boards: arm: gd32f450i_eval: add i2c0 interface

Add i2c0 interface to gd32f450i_eval board.

Signed-off-by: HaiLong Yang <cameledyang@pm.me>

boards/arm/gd32f450i_eval/doc/index.rst

@@ -80,6 +80,12 @@ The board configuration supports the following hardware features:
    * - DAC
      - :kconfig:`CONFIG_DAC`
      - :dtcompatible:`gd,gd32-dac`
+   * - I2C
+     - :kconfig:`CONFIG_I2C`
+     - :dtcompatible:`gd,gd32-i2c`
+   * - EEPROM
+     - :kconfig:`CONFIG_EEPROM`
+     - :dtcompatible:`atmel,at24`
 
 Serial Port
 ===========

boards/arm/gd32f450i_eval/gd32f450i_eval-pinctrl.dtsi

@@ -23,4 +23,11 @@
 			pinmux = <TIMER1_CH2_PB10>;
 		};
 	};
+
+	i2c0_default: i2c0_default {
+		group1 {
+			pinmux = <I2C0_SCL_PB6>, <I2C0_SDA_PB7>;
+			drive-open-drain;
+		};
+	};
 };

boards/arm/gd32f450i_eval/gd32f450i_eval.dts

@@ -65,6 +65,7 @@
 		led1 = &led2;
 		sw0 = &user_key;
 		pwm-led0 = &pwm_led;
+		eeprom-0 = &eeprom0;
 	};
 };
 
@@ -110,3 +111,20 @@
 		pinctrl-names = "default";
 	};
 };
+
+&i2c0 {
+	status = "okay";
+	pinctrl-0 = <&i2c0_default>;
+	pinctrl-names = "default";
+
+	eeprom0: eeprom@50 {
+		compatible = "atmel,at24";
+		reg = <0x50>;
+		status = "okay";
+		label = "EEPROM_AT24C02";
+		size = <256>;
+		pagesize = <8>;
+		address-width = <8>;
+		timeout = <5>;
+	};
+};