soc: arm: uart: Add STM32G0X UART support

Add UART support for STM32G0X SoC series.

Signed-off-by: Philippe Retornaz <[email protected]>
Signed-off-by: Francois Ramu <[email protected]>

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

dts/arm/st/g0/stm32g0.dtsi

@@ -106,6 +106,24 @@
 			};
 		};
 
+		usart1: serial@40013800 {
+			compatible = "st,stm32-usart", "st,stm32-uart";
+			reg = <0x40013800 0x400>;
+			clocks = <&rcc STM32_CLOCK_BUS_APB2 0x00004000>;
+			interrupts = <27 0>;
+			status = "disabled";
+			label = "UART_1";
+		};
+
+		usart2: serial@40004400 {
+			compatible = "st,stm32-usart", "st,stm32-uart";
+			reg = <0x40004400 0x400>;
+			clocks = <&rcc STM32_CLOCK_BUS_APB1 0x00020000>;
+			interrupts = <28 0>;
+			status = "disabled";
+			label = "UART_2";
+		};
+
 		timers3: timers@40000400 {
 			compatible = "st,stm32-timers";
 			reg = <0x40000400 0x400>;

soc/arm/st_stm32/stm32g0/dts_fixup.h

@@ -61,4 +61,23 @@
 #define DT_GPIO_STM32_GPIOF_CLOCK_BITS		DT_ST_STM32_GPIO_50001400_CLOCK_BITS
 #define DT_GPIO_STM32_GPIOF_CLOCK_BUS		DT_ST_STM32_GPIO_50001400_CLOCK_BUS
 
+/* there is no reference to GPIOE, GPIOG and GPIOH in the dts files */
+
+#define DT_UART_STM32_USART_1_BASE_ADDRESS	DT_ST_STM32_USART_40013800_BASE_ADDRESS
+#define DT_UART_STM32_USART_1_BAUD_RATE	DT_ST_STM32_USART_40013800_CURRENT_SPEED
+#define DT_UART_STM32_USART_1_IRQ_PRI	DT_ST_STM32_USART_40013800_IRQ_0_PRIORITY
+#define DT_UART_STM32_USART_1_NAME		DT_ST_STM32_USART_40013800_LABEL
+#define DT_USART_1_IRQ				DT_ST_STM32_USART_40013800_IRQ_0
+#define DT_UART_STM32_USART_1_CLOCK_BITS	DT_ST_STM32_USART_40013800_CLOCK_BITS
+#define DT_UART_STM32_USART_1_CLOCK_BUS	DT_ST_STM32_USART_40013800_CLOCK_BUS
+
+#define DT_UART_STM32_USART_2_BASE_ADDRESS	DT_ST_STM32_USART_40004400_BASE_ADDRESS
+#define DT_UART_STM32_USART_2_BAUD_RATE	DT_ST_STM32_USART_40004400_CURRENT_SPEED
+#define DT_UART_STM32_USART_2_IRQ_PRI	DT_ST_STM32_USART_40004400_IRQ_0_PRIORITY
+#define DT_UART_STM32_USART_2_NAME		DT_ST_STM32_USART_40004400_LABEL
+#define DT_USART_2_IRQ				DT_ST_STM32_USART_40004400_IRQ_0
+#define DT_UART_STM32_USART_2_CLOCK_BITS	DT_ST_STM32_USART_40004400_CLOCK_BITS
+#define DT_UART_STM32_USART_2_CLOCK_BUS	DT_ST_STM32_USART_40004400_CLOCK_BUS
+#define DT_UART_STM32_USART_2_HW_FLOW_CONTROL	DT_ST_STM32_USART_40004400_HW_FLOW_CONTROL
+
 /* End of SoC Level DTS fixup file */

soc/arm/st_stm32/stm32g0/soc.h

@@ -44,6 +44,10 @@
 #include <stm32g0xx_ll_gpio.h>
 #endif
 
+#ifdef CONFIG_SERIAL_HAS_DRIVER
+#include <stm32g0xx_ll_usart.h>
+#endif
+
 #endif /* !_ASMLANGUAGE */
 
 #endif /* _STM32G0_SOC_H_ */