soc: nxp: mcx/mcxa: Enable poweroff for mcxa series

This commit introduced the following changes:
1. Selected kconfig option 'HAS_POWEROFF' for NXP
   MCXA series.
2. Added power.c for NXP MCXA series, in this file,
   we currently implemented 'z_sys_poweroff()' function.
3. For the MCXA series, after waking up from the deep
   power down mode, the reset handler will be executed,
   and we need to release the I/O pads and certain peripheral
   devices to normal operating mode in 'soc_reset_hook'.

Signed-off-by: Zhaoxiang Jin <Zhaoxiang.Jin_1@nxp.com>

Author: ZhaoxiangJin

soc/nxp/mcx/mcxa/CMakeLists.txt

@@ -1,5 +1,5 @@
 #
-# Copyright 2024 NXP
+# Copyright 2024-2025 NXP
 #
 # SPDX-License-Identifier: Apache-2.0
 #
@@ -8,3 +8,7 @@ zephyr_sources(soc.c)
 zephyr_include_directories(.)
 
 set(SOC_LINKER_SCRIPT ${ZEPHYR_BASE}/include/zephyr/arch/arm/cortex_m/scripts/linker.ld CACHE INTERNAL "")
+
+if(CONFIG_POWEROFF)
+  zephyr_sources(power.c)
+endif()

soc/nxp/mcx/mcxa/Kconfig

@@ -9,6 +9,7 @@ config SOC_SERIES_MCXA
 	select CPU_CORTEX_M_HAS_SYSTICK
 	select CPU_CORTEX_M_HAS_DWT
 	select SOC_RESET_HOOK
+	select HAS_POWEROFF
 
 config SOC_MCXA153
 	select CPU_CORTEX_M33

soc/nxp/mcx/mcxa/power.c

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/sys/poweroff.h>
+#include <zephyr/toolchain.h>
+#include "fsl_cmc.h"
+#include "fsl_spc.h"
+#include "fsl_vbat.h"
+#include "fsl_wuu.h"
+#include <stdio.h>
+
+void z_sys_poweroff(void)
+{
+	cmc_power_domain_config_t cmc_config = {
+		.clock_mode  = kCMC_GateAllSystemClocksEnterLowPowerMode,
+		.main_domain = kCMC_DeepPowerDown,
+	};
+
+	WUU_SetInternalWakeUpModulesConfig(WUU0, 6U, kWUU_InternalModuleInterrupt);
+	SPC_SetLowPowerWakeUpDelay(SPC0, 0x5B);
+
+	CMC_SetPowerModeProtection(CMC, kCMC_AllowDeepPowerDownMode);
+	CMC_EnterLowPowerMode(CMC, &cmc_config);
+
+	CODE_UNREACHABLE;
+}

soc/nxp/mcx/mcxa/soc.c

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024 NXP
+ * Copyright 2024-2025 NXP
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -16,10 +16,23 @@
 #include <zephyr/device.h>
 #include <zephyr/init.h>
 #include <soc.h>
+#if defined(CONFIG_PM) || defined(CONFIG_POWEROFF)
+#include <fsl_spc.h>
+#include <fsl_cmc.h>
+#endif
 
 #ifdef CONFIG_SOC_RESET_HOOK
 void soc_reset_hook(void)
 {
+#if defined(CONFIG_PM) || defined(CONFIG_POWEROFF)
+	/* Release the I/O pads and certain peripherals to normal run mode state,
+	 * for in Power Down mode they will be in a latched state.
+	 */
+	if ((CMC_GetSystemResetStatus(CMC) & kCMC_WakeUpReset) != 0UL) {
+		SPC_ClearPeriphIOIsolationFlag(SPC0);
+	}
+#endif
+
 	SystemInit();
 }
 #endif