serial: st-asc: Switch from CONFIG_PM_SLEEP guards to pm_sleep_ptr()

Letting the compiler remove these functions when the kernel is built
without CONFIG_PM_SLEEP support is simpler and less error prone than the
use of #ifdef based kernel configuration guards.
Signed-off-by: Raphael Gallais-Pou <rgallaispou@gmail.com>
Link: https://lore.kernel.org/r/20240716180010.126987-1-rgallaispou@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/st-asc.c

@@ -808,7 +808,6 @@ static void asc_serial_remove(struct platform_device *pdev)
 	uart_remove_one_port(&asc_uart_driver, port);
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int asc_serial_suspend(struct device *dev)
 {
 	struct uart_port *port = dev_get_drvdata(dev);
@@ -823,8 +822,6 @@ static int asc_serial_resume(struct device *dev)
 	return uart_resume_port(&asc_uart_driver, port);
 }
 
-#endif /* CONFIG_PM_SLEEP */
-
 /*----------------------------------------------------------------------*/
 
 #ifdef CONFIG_SERIAL_ST_ASC_CONSOLE
@@ -932,16 +929,15 @@ static struct uart_driver asc_uart_driver = {
 	.cons		= ASC_SERIAL_CONSOLE,
 };
 
-static const struct dev_pm_ops asc_serial_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(asc_serial_suspend, asc_serial_resume)
-};
+static DEFINE_SIMPLE_DEV_PM_OPS(asc_serial_pm_ops, asc_serial_suspend,
+						   asc_serial_resume);
 
 static struct platform_driver asc_serial_driver = {
 	.probe		= asc_serial_probe,
 	.remove_new	= asc_serial_remove,
 	.driver	= {
 		.name	= DRIVER_NAME,
-		.pm	= &asc_serial_pm_ops,
+		.pm	= pm_sleep_ptr(&asc_serial_pm_ops),
 		.of_match_table = of_match_ptr(asc_match),
 	},
 };