drivers: pwm: Add STM32G0XX pwm support

Add pwm support for STM32G0X SoC series.

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

Author: FRASTM

drivers/pwm/pwm_stm32.c

@@ -35,7 +35,7 @@ static u32_t __get_tim_clk(u32_t bus_clk,
 	if (pclken->bus == STM32_CLOCK_BUS_APB1) {
 		apb_psc = CONFIG_CLOCK_STM32_APB1_PRESCALER;
 	}
-#ifndef CONFIG_SOC_SERIES_STM32F0X
+#if !defined(CONFIG_SOC_SERIES_STM32F0X) && !defined(CONFIG_SOC_SERIES_STM32G0X)
 	else {
 		apb_psc = CONFIG_CLOCK_STM32_APB2_PRESCALER;
 	}

dts/arm/st/g0/stm32g0.dtsi

@@ -54,6 +54,22 @@
 			label = "STM32_CLK_RCC";
 		};
 
+		timers3: timers@40000400 {
+			compatible = "st,stm32-timers";
+			reg = <0x40000400 0x400>;
+			clocks = <&rcc STM32_CLOCK_BUS_APB1 0x00000002>;
+			status = "disabled";
+			label = "TIMERS_3";
+
+			pwm {
+				compatible = "st,stm32-pwm";
+				status = "disabled";
+				st,prescaler = <10000>;
+				label = "PWM_3";
+				#pwm-cells = <2>;
+			};
+		};
+
 	};
 };
 

soc/arm/st_stm32/stm32g0/dts_fixup.h

@@ -11,4 +11,7 @@
 #define DT_FLASH_DEV_BASE_ADDRESS		DT_ST_STM32G0_FLASH_CONTROLLER_40022000_BASE_ADDRESS
 #define DT_FLASH_DEV_NAME			    DT_ST_STM32G0_FLASH_CONTROLLER_40022000_LABEL
 
+#define DT_PWM_STM32_3_DEV_NAME		    DT_ST_STM32_PWM_40000400_PWM_LABEL
+#define DT_PWM_STM32_3_PRESCALER		DT_ST_STM32_PWM_40000400_PWM_ST_PRESCALER
+
 /* End of SoC Level DTS fixup file */