soc: nxp: mcxw2xx: Add poweroff support

Add poweroff MCXW2xx SoCs, support btn_wk pin wakeup.

Signed-off-by: Jason Yu <zejiang.yu@nxp.com>

Author: zejiang0jason

soc/nxp/mcx/mcxw/mcxw2xx/CMakeLists.txt

@@ -6,6 +6,8 @@ zephyr_sources(soc.c)
 
 zephyr_sources_ifdef(CONFIG_PM power.c)
 
+zephyr_sources_ifdef(CONFIG_POWEROFF poweroff.c)
+
 zephyr_include_directories(./)
 
 set(SOC_LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld CACHE INTERNAL "")

soc/nxp/mcx/mcxw/mcxw2xx/Kconfig

@@ -1,3 +1,6 @@
 # Copyright 2025 NXP
 #
 # SPDX-License-Identifier: Apache-2.0
+
+config SOC_SERIES_MCXW2XX
+	select HAS_POWEROFF

soc/nxp/mcx/mcxw/mcxw2xx/poweroff.c

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/devicetree.h>
+#include <zephyr/sys/poweroff.h>
+#include <zephyr/toolchain.h>
+#include <zephyr/drivers/gpio.h>
+#include <fsl_power.h>
+
+#if CONFIG_GPIO && DT_NODE_EXISTS(DT_NODELABEL(btn_wk))
+
+#if (DT_GPIO_FLAGS(DT_NODELABEL(btn_wk), gpios)) & GPIO_ACTIVE_LOW
+#define POWEROFF_WAKEUP (kWAKEUP_PIN_ENABLE | \
+			 kWAKEUP_PIN_PUP_EN | \
+			 kWAKEUP_PIN_WAKEUP_LOW_LVL)
+#else /* !GPIO_ACTIVE_LOW */
+#define POWEROFF_WAKEUP (kWAKEUP_PIN_ENABLE | \
+			 kWAKEUP_PIN_PDN_EN | \
+			 kWAKEUP_PIN_WAKEUP_HIGH_LVL)
+#endif /* GPIO_ACTIVE_LOW */
+
+#else
+#define POWEROFF_WAKEUP kWAKEUP_PIN_DISABLE
+#endif /* CONFIG_GPIO && DT_NODE_EXISTS(DT_NODELABEL(btn_wk)) */
+
+void z_sys_poweroff(void)
+{
+	POWER_EnterPowerOff(0, POWEROFF_WAKEUP);
+
+	CODE_UNREACHABLE;
+}