boards: wch: ch32v003evt: enable i2c and define i2c pins

enabled i2c for ch32v003evt
added default i2c pins for ch32v003evt
added i2c as supported

Signed-off-by: Andrei-Edward Popa <andrei.popa105@yahoo.com>

boards/wch/ch32v003evt/ch32v003evt-pinctrl.dtsi

@@ -18,4 +18,12 @@
 			bias-pull-up;
 		};
 	};
+
+	i2c1_default: i2c1_default {
+		group1 {
+			pinmux = <I2C1_SDA_PC1_0>, <I2C1_SCL_PC2_0>;
+			output-high;
+			drive-open-drain;
+		};
+	};
 };

boards/wch/ch32v003evt/ch32v003evt.dts

@@ -8,6 +8,9 @@
 #include <wch/ch32v0/ch32v003f4p.dtsi>
 #include "ch32v003evt-pinctrl.dtsi"
 
+#include <zephyr/dt-bindings/gpio/gpio.h>
+#include <zephyr/dt-bindings/i2c/i2c.h>
+
 / {
 	model = "ch32v003evt";
 	compatible = "wch,ch32v003";
@@ -53,10 +56,21 @@
 	clocks = <&pll>;
 };
 
+&gpioc {
+	status = "okay";
+};
+
 &gpiod {
 	status = "okay";
 };
 
+&i2c1 {
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	pinctrl-0 = <&i2c1_default>;
+	pinctrl-names = "default";
+};
+
 &usart1 {
 	status = "okay";
 	current-speed = <115200>;

boards/wch/ch32v003evt/ch32v003evt.yaml

@@ -9,3 +9,4 @@ ram: 2
 flash: 16
 supported:
   - gpio
+  - i2c