arch/stm32h7: add an option to bypass clock configuration

arch/arm/src/stm32h7/Kconfig

@@ -2090,6 +2090,15 @@ config STM32H7_QSPI_REGDEBUG
 
 endmenu
 
+config STM32H7_BYPASS_CLOCKCONFIG
+	bool "Bypass clock configuration"
+	depends on ARCH_STM32H7_DUALCORE
+	default n if ARCH_CHIP_STM32H7_CORTEXM7
+	default y if ARCH_CHIP_STM32H7_CORTEXM4
+	---help---
+		Bypass clock configuration. For dual core chips only one core
+		should configure clocks
+
 config STM32H7_CUSTOM_CLOCKCONFIG
 	bool "Custom clock configuration"
 	default n

arch/arm/src/stm32h7/stm32_rcc.c

@@ -93,24 +93,25 @@
 
 void stm32_clockconfig(void)
 {
+#ifndef CONFIG_STM32H7_BYPASS_CLOCKCONFIG
   /* Make sure that we are starting in the reset state */
 
   rcc_reset();
 
-#if defined(CONFIG_STM32H7_PWR)
+#  if defined(CONFIG_STM32H7_PWR)
 
   /* Insure the bkp is initialized */
 
   stm32_pwr_initbkp(false);
-#endif
+#  endif
 
-#if defined(CONFIG_STM32H7_CUSTOM_CLOCKCONFIG)
+#  if defined(CONFIG_STM32H7_CUSTOM_CLOCKCONFIG)
 
   /* Invoke Board Custom Clock Configuration */
 
   stm32_board_clockconfig();
 
-#else
+#  else
 
   /* Invoke standard, fixed clock configuration based on definitions in
    * board.h
@@ -118,7 +119,8 @@ void stm32_clockconfig(void)
 
   stm32_stdclockconfig();
 
-#endif
+#  endif
+#endif  /* !CONFIG_STM32H7_BYPASS_CLOCKCONFIG */
 
   /* Enable peripheral clocking */