drivers: wdt_iwdg_stm32.c: freeze watchdog in debug mode for mp2x SoCs

The IWDG4 is on the APB3 bus on STM32MP2x SoCs. When the system is
in debug mode, the watchdog should be frozen to prevent it from
expiring and resetting the system during debugging sessions.

Signed-off-by: Luc BEAUFILS <luc.beaufils@savoirfairelinux.com>

Author: lucbeaufils

drivers/watchdog/wdt_iwdg_stm32.c

@@ -105,6 +105,8 @@ static int iwdg_stm32_setup(const struct device *dev, uint8_t options)
 		LL_DBGMCU_APB4_GRP1_FreezePeriph(LL_DBGMCU_APB4_GRP1_IWDG1_STOP);
 #elif defined(CONFIG_SOC_SERIES_STM32H7RSX)
 		LL_DBGMCU_APB4_GRP1_FreezePeriph(LL_DBGMCU_APB4_GRP1_IWDG_STOP);
+#elif defined(CONFIG_SOC_SERIES_STM32MP2X)
+		LL_DBGMCU_APB3_GRP1_FreezePeriph(LL_DBGMCU_APB3_GRP1_IWDG4_STOP);
 #else
 		LL_DBGMCU_APB1_GRP1_FreezePeriph(LL_DBGMCU_APB1_GRP1_IWDG_STOP);
 #endif