watchdog: imx2_wdt: Remove __maybe_unused notations

Use the DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr() macros to
handle the .suspend/.resume callbacks.

These macros allow the suspend and resume functions to be automatically
dropped by the compiler when CONFIG_SUSPEND is disabled, without having
to use __maybe_unused notation.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20240809020822.335682-1-festevam@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: Fabio Estevam

drivers/watchdog/imx2_wdt.c

@@ -379,7 +379,7 @@ static void imx2_wdt_shutdown(struct platform_device *pdev)
 }
 
 /* Disable watchdog if it is active or non-active but still running */
-static int __maybe_unused imx2_wdt_suspend(struct device *dev)
+static int imx2_wdt_suspend(struct device *dev)
 {
 	struct watchdog_device *wdog = dev_get_drvdata(dev);
 	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
@@ -404,7 +404,7 @@ static int __maybe_unused imx2_wdt_suspend(struct device *dev)
 }
 
 /* Enable watchdog and configure it if necessary */
-static int __maybe_unused imx2_wdt_resume(struct device *dev)
+static int imx2_wdt_resume(struct device *dev)
 {
 	struct watchdog_device *wdog = dev_get_drvdata(dev);
 	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
@@ -435,8 +435,8 @@ static int __maybe_unused imx2_wdt_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(imx2_wdt_pm_ops, imx2_wdt_suspend,
-			 imx2_wdt_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(imx2_wdt_pm_ops, imx2_wdt_suspend,
+				imx2_wdt_resume);
 
 static struct imx2_wdt_data imx_wdt = {
 	.wdw_supported = true,
@@ -476,7 +476,7 @@ static struct platform_driver imx2_wdt_driver = {
 	.shutdown	= imx2_wdt_shutdown,
 	.driver		= {
 		.name	= DRIVER_NAME,
-		.pm     = &imx2_wdt_pm_ops,
+		.pm     = pm_sleep_ptr(&imx2_wdt_pm_ops),
 		.of_match_table = imx2_wdt_dt_ids,
 	},
 };