soc: stm32f3xx: support of Cube LL Clock driver

After introduction of STM32Cube based clock control driver for
stm32 family, provide its support on stm32f3x soc.
Clean up will have to be done afterwards.

Change-Id: I20480579f12a6fc1f1f6a51589981ac3f1d63ef0
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>

arch/arm/soc/st_stm32/stm32f3/soc.c

@@ -42,8 +42,12 @@ static int stm32f3_init(struct device *arg)
 	irq_unlock(key);
 
 	/* Update CMSIS SystemCoreClock variable (HCLK) */
+#ifdef CONFIG_CLOCK_CONTROL_STM32_CUBE
+	/* At reset, System core clock is set to 4MHz */
+	SystemCoreClock = 4000000;
+#else
 	SystemCoreClock = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC;
-
+#endif /* CONFIG_CLOCK_CONTROL_STM32_CUBE */
 	return 0;
 }
 

arch/arm/soc/st_stm32/stm32f3/soc.h

@@ -52,6 +52,13 @@ enum stm32f3x_pin_config_mode {
 #include <stm32f3xx_ll_usart.h>
 #endif
 
+#ifdef CONFIG_CLOCK_CONTROL_STM32_CUBE
+#include <stm32f3xx_ll_utils.h>
+#include <stm32f3xx_ll_bus.h>
+#include <stm32f3xx_ll_rcc.h>
+#include <stm32f3xx_ll_system.h>
+#endif /* CONFIG_CLOCK_CONTROL_STM32_CUBE */
+
 #endif /* !_ASMLANGUAGE */
 
 #endif /* _STM32F3_SOC_H_ */

arch/arm/soc/st_stm32/stm32f3/soc_gpio.c

@@ -188,7 +188,16 @@ int stm32_gpio_enable_int(int port, int pin)
 	struct device *clk =
 		device_get_binding(STM32_CLOCK_CONTROL_NAME);
 
+#ifdef CONFIG_CLOCK_CONTROL_STM32_CUBE
+	struct stm32_pclken pclken = {
+		.bus = STM32_CLOCK_BUS_APB2,
+		.enr = LL_APB2_GRP1_PERIPH_SYSCFG
+	};
+
+	clock_control_on(clk, (clock_control_subsys_t *) &pclken);
+#else
 	clock_control_on(clk, UINT_TO_POINTER(STM32F3X_CLOCK_SUBSYS_SYSCFG));
+#endif /* CONFIG_CLOCK_CONTROL_STM32_CUBE */
 
 	int shift = 0;