boards: uart: Add UART6 for 96b_carbon

Enabled UART 6 on pin PC6 and PC7 for 96b_carbon

Signed-off-by: Sahaj Sarup <[email protected]>

Author: ric96

boards/arm/96b_carbon/96b_carbon.dts

@@ -32,6 +32,13 @@
 	status = "ok";
 };
 
+&usart6 {
+	current-speed = <115200>;
+	pinctrl-0 = <&usart6_pins_a>;
+	pinctrl-names = "default";
+	status = "ok";
+};
+
 &i2c1 {
 	status = "ok";
 	clock-frequency = <I2C_BITRATE_FAST>;

boards/arm/96b_carbon/pinmux.c

@@ -22,6 +22,10 @@ static const struct pin_config pinconf[] = {
 	{STM32_PIN_PA2, STM32F4_PINMUX_FUNC_PA2_USART2_TX},
 	{STM32_PIN_PA3, STM32F4_PINMUX_FUNC_PA3_USART2_RX},
 #endif	/* CONFIG_UART_STM32_PORT_2 */
+#ifdef CONFIG_UART_STM32_PORT_6
+	{STM32_PIN_PC6, STM32F4_PINMUX_FUNC_PC6_USART6_TX},
+	{STM32_PIN_PC7, STM32F4_PINMUX_FUNC_PC7_USART6_RX},
+#endif	/* CONFIG_UART_STM32_PORT_6 */
 #ifdef CONFIG_I2C_1
 	{STM32_PIN_PB6, STM32F4_PINMUX_FUNC_PB6_I2C1_SCL},
 	{STM32_PIN_PB7, STM32F4_PINMUX_FUNC_PB7_I2C1_SDA},

drivers/serial/uart_stm32.c

@@ -426,7 +426,7 @@ UART_DEVICE_INIT_STM32(5, STM32_CLOCK_BUS_APB1, LL_APB1_GRP1_PERIPH_UART5)
 #endif /* CONFIG_UART_STM32_PORT_5 */
 
 #ifdef CONFIG_UART_STM32_PORT_6
-UART_DEVICE_INIT_STM32(6, STM32_CLOCK_BUS_APB2, LL_APB2_GRP1_PERIPH_UART6)
+UART_DEVICE_INIT_STM32(6, STM32_CLOCK_BUS_APB2, LL_APB2_GRP1_PERIPH_USART6)
 #endif /* CONFIG_UART_STM32_PORT_6 */
 
 #ifdef CONFIG_UART_STM32_PORT_7

dts/arm/st/stm32f4-pinctrl.dtsi

@@ -45,6 +45,12 @@
 					tx = <STM32_PIN_PD8 (STM32_PINMUX_ALT_FUNC_7 | STM32_PUSHPULL_NOPULL)>;
 				};
 			};
+			usart6_pins_a: usart6@0 {
+				rx_tx {
+					rx = <STM32_PIN_PC7 (STM32_PINMUX_ALT_FUNC_7 | STM32_PUPDR_NO_PULL)>;
+					tx = <STM32_PIN_PC6 (STM32_PINMUX_ALT_FUNC_7 | STM32_PUSHPULL_NOPULL)>;
+				};
+			};
 		};
 	};
 };