drivers: serial: nrfx_uarte: Add support for device deinit

drivers/pinctrl/Kconfig

@@ -34,6 +34,10 @@ config PINCTRL_DYNAMIC
 	  runtime. This can be useful, for example, to change the pins assigned to a
 	  peripheral at early boot stages depending on a certain input.
 
+config PINCTRL_KEEP_SLEEP_STATE
+	bool "Keep sleep state"
+	default y if PM || PM_DEVICE
+
 source "drivers/pinctrl/Kconfig.b91"
 source "drivers/pinctrl/Kconfig.bflb"
 source "drivers/pinctrl/Kconfig.ambiq"

drivers/serial/Kconfig.nrfx

@@ -43,6 +43,13 @@ config UART_NRFX_UARTE_NO_IRQ
 	  When enabled, then interrupt handler is not used at all and it is possible
 	  to get to the lowest power state after uart_poll_out if receiver is not used.
 
+config UART_NRFX_UARTE_DEINIT
+	bool "Support deinit"
+	depends on UART_NRFX_UARTE
+	imply PINCTRL_KEEP_SLEEP_STATE
+	help
+	  When enabled then UART driver support device_deinit.
+
 config UART_NRFX_UARTE_LEGACY_SHIM
 	bool "Legacy UARTE shim"
 	depends on UART_NRFX_UARTE

drivers/serial/uart_nrfx_uarte.c

@@ -2521,6 +2521,22 @@ static int uarte_instance_init(const struct device *dev,
 	return pm_device_driver_init(dev, uarte_nrfx_pm_action);
 }
 
+static int uarte_instance_deinit(const struct device *dev)
+{
+	if (IS_ENABLED(CONFIG_PM_DEVICE)) {
+		enum pm_device_state state;
+
+		/* PM must have suspended the device before driver can be deinitialized. */
+		(void)pm_device_state_get(dev, &state);
+		return (state == PM_DEVICE_STATE_SUSPENDED) || (state == PM_DEVICE_STATE_OFF) ?
+		       0 : -EBUSY;
+	}
+
+	uarte_pm_suspend(dev);
+
+	return 0;
+}
+
 #define UARTE_GET_ISR(idx) \
 	COND_CODE_1(CONFIG_UART_##idx##_ASYNC, (uarte_nrfx_isr_async), (uarte_nrfx_isr_int))
 
@@ -2706,8 +2722,10 @@ static int uarte_instance_init(const struct device *dev,
 	PM_DEVICE_DT_DEFINE(UARTE(idx), uarte_nrfx_pm_action,		       \
 			    UARTE_PM_ISR_SAFE(idx));			       \
 									       \
-	DEVICE_DT_DEFINE(UARTE(idx),					       \
+	DEVICE_DT_DEINIT_DEFINE(UARTE(idx),				       \
 		      uarte_##idx##_init,				       \
+		      IS_ENABLED(CONFIG_UART_NRFX_UARTE_DEINIT) ?	       \
+		       uarte_instance_deinit : NULL,			       \
 		      PM_DEVICE_DT_GET(UARTE(idx)),			       \
 		      &uarte_##idx##_data,				       \
 		      &uarte_##idx##z_config,				       \

include/zephyr/drivers/pinctrl.h

@@ -78,7 +78,7 @@ struct pinctrl_dev_config {
 
 /** @cond INTERNAL_HIDDEN */
 
-#if !defined(CONFIG_PM) && !defined(CONFIG_PM_DEVICE)
+#if !defined(CONFIG_PINCTRL_KEEP_SLEEP_STATE)
 /** Out of power management configurations, ignore "sleep" state. */
 #define PINCTRL_SKIP_SLEEP 1
 #endif