boards: arm: nucleo_h743zi: enable I2C support

Enable I2C support, including for the Arduino R3 connector.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

boards/arm/nucleo_h743zi/Kconfig.defconfig

@@ -12,4 +12,8 @@ config UART_3
 	default y
 	depends on UART_CONSOLE
 
+config I2C_1
+	default y
+	depends on I2C
+
 endif # BOARD_NUCLEO_H743ZI

boards/arm/nucleo_h743zi/arduino_r3_connector.dtsi

@@ -35,3 +35,5 @@
 			   <21 0 &gpiob 8 0>;	/* D15 */
 	};
 };
+
+arduino_i2c: &i2c1 {};

boards/arm/nucleo_h743zi/doc/index.rst

@@ -107,6 +107,8 @@ features:
 +-----------+------------+-------------------------------------+
 | RTC       | on-chip    | counter                             |
 +-----------+------------+-------------------------------------+
+| I2C       | on-chip    | i2c                                 |
++-----------+------------+-------------------------------------+
 
 Other hardware features are not yet supported on this Zephyr port.
 
@@ -126,6 +128,7 @@ and a ST morpho connector. Board is configured as follows:
 - LD1 : PB0
 - LD2 : PB7
 - LD3 : PB14
+- I2C : PB8, PB9
 
 System Clock
 ------------

boards/arm/nucleo_h743zi/nucleo_h743zi.dts

@@ -60,3 +60,8 @@
 &rtc {
 	status = "okay";
 };
+
+&i2c1 {
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_FAST>;
+};

boards/arm/nucleo_h743zi/nucleo_h743zi.yaml

@@ -10,6 +10,8 @@ ram: 512
 flash: 2048
 supported:
   - arduino_gpio
+  - arduino_i2c
   - uart
   - gpio
   - counter
+  - i2c

boards/arm/nucleo_h743zi/pinmux.c

@@ -18,6 +18,10 @@ static const struct pin_config pinconf[] = {
 	{ STM32_PIN_PD8, STM32H7_PINMUX_FUNC_PD8_USART3_TX },
 	{ STM32_PIN_PD9, STM32H7_PINMUX_FUNC_PD9_USART3_RX },
 #endif /* CONFIG_UART_3 */
+#ifdef CONFIG_I2C_1
+	{ STM32_PIN_PB8, STM32H7_PINMUX_FUNC_PB8_I2C1_SCL },
+	{ STM32_PIN_PB9, STM32H7_PINMUX_FUNC_PB9_I2C1_SDA },
+#endif /* CONFIG_I2C_1 */
 };
 
 static int pinmux_stm32_init(struct device *port)