soc: st: stm32: poweroff uses stm32_wkup_pins

Update the poweroff code to use stm32_pwr_wkup_pin_cfg_pupd if enabled.

Signed-off-by: Tomáš Juřena <jurenatomas@gmail.com>

soc/st/stm32/stm32c0x/poweroff.c

@@ -1,19 +1,30 @@
 /*
  * Copyright (c) 2024 Kickmaker
+ * Copyright (c) 2025 Tomas Jurena
+ *
  * SPDX-License-Identifier: Apache-2.0
  */
 
 #include <zephyr/kernel.h>
 #include <zephyr/sys/poweroff.h>
 #include <zephyr/toolchain.h>
+#include <zephyr/drivers/misc/stm32_wkup_pins/stm32_wkup_pins.h>
 
 #include <stm32_ll_cortex.h>
 #include <stm32_ll_pwr.h>
+#include <stm32_ll_system.h>
 
 void z_sys_poweroff(void)
 {
+#ifdef CONFIG_STM32_WKUP_PINS
+	stm32_pwr_wkup_pin_cfg_pupd();
+
+	LL_PWR_ClearFlag_WU();
+#endif /* CONFIG_STM32_WKUP_PINS */
+
 	LL_PWR_SetPowerMode(LL_PWR_MODE_SHUTDOWN);
 	LL_LPM_EnableDeepSleep();
+	LL_DBGMCU_DisableDBGStandbyMode();
 
 	k_cpu_idle();