Revert "driver: serial: uart_ns16550: Add pm support for uart_ns16550 driver"

This reverts commit fd88386, it breaks
uart support on ITE platforms when PM is enabled but PM_RUNTIME is not,
possibly others as well.

Signed-off-by: Fabio Baltieri <[email protected]>

Author: fabiobaltieri

drivers/serial/uart_ns16550.c

@@ -30,7 +30,6 @@
 #include <zephyr/drivers/uart.h>
 #include <zephyr/drivers/clock_control.h>
 #include <zephyr/pm/policy.h>
-#include <zephyr/pm/device.h>
 #include <zephyr/sys/sys_io.h>
 #include <zephyr/spinlock.h>
 #include <zephyr/irq.h>
@@ -733,22 +732,6 @@ static int uart_ns16550_configure(const struct device *dev,
 	return ret;
 };
 
-__maybe_unused static int uart_ns16550_pm_action(const struct device *dev,
-						 enum pm_device_action action)
-{
-	struct uart_ns16550_dev_data *data = dev->data;
-	struct uart_config *uart_cfg = &data->uart_config;
-
-	switch (action) {
-	case PM_DEVICE_ACTION_RESUME:
-		return uart_ns16550_configure(dev, uart_cfg);
-	case PM_DEVICE_ACTION_SUSPEND:
-		return 0;
-	default:
-		return -ENOTSUP;
-	}
-}
-
 #ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
 static int uart_ns16550_config_get(const struct device *dev,
 				   struct uart_config *cfg)
@@ -1996,8 +1979,7 @@ static DEVICE_API(uart, uart_ns16550_driver_api) = {
 	static struct uart_ns16550_dev_data uart_ns16550_dev_data_##n = {            \
 		UART_NS16550_COMMON_DEV_DATA_INITIALIZER(n)                          \
 	};                                                                           \
-	PM_DEVICE_DT_INST_DEFINE(n, uart_ns16550_pm_action);                         \
-	DEVICE_DT_INST_DEFINE(n, uart_ns16550_init, PM_DEVICE_DT_INST_GET(n),	     \
+	DEVICE_DT_INST_DEFINE(n, uart_ns16550_init, NULL,                            \
 			      &uart_ns16550_dev_data_##n, &uart_ns16550_dev_cfg_##n, \
 			      PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY,             \
 			      &uart_ns16550_driver_api);                             \
@@ -2015,8 +1997,7 @@ static DEVICE_API(uart, uart_ns16550_driver_api) = {
 	static struct uart_ns16550_dev_data uart_ns16550_dev_data_##n = {            \
 		UART_NS16550_COMMON_DEV_DATA_INITIALIZER(n)                          \
 	};                                                                           \
-	PM_DEVICE_DT_INST_DEFINE(n, uart_ns16550_pm_action);			     \
-	DEVICE_DT_INST_DEFINE(n, uart_ns16550_init, PM_DEVICE_DT_INST_GET(n),	     \
+	DEVICE_DT_INST_DEFINE(n, uart_ns16550_init, NULL,                            \
 			      &uart_ns16550_dev_data_##n, &uart_ns16550_dev_cfg_##n, \
 			      PRE_KERNEL_1,            \
 			      CONFIG_SERIAL_INIT_PRIORITY,                           \