watchdog: renesas_wdt: Convert to DEFINE_SIMPLE_DEV_PM_OPS()

Convert the Renesas WDT watchdog driver from SIMPLE_DEV_PM_OPS() to
DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr().  This lets us drop the
__maybe_unused annotations from its suspend and resume callbacks, and
reduces kernel size in case CONFIG_PM or CONFIG_PM_SLEEP is disabled.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/3d6d46ff56c908880a167ffb2a74c713060a1a57.1752088043.git.geert+renesas@glider.be
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: geertu

drivers/watchdog/renesas_wdt.c

@@ -300,7 +300,7 @@ static void rwdt_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 }
 
-static int __maybe_unused rwdt_suspend(struct device *dev)
+static int rwdt_suspend(struct device *dev)
 {
 	struct rwdt_priv *priv = dev_get_drvdata(dev);
 
@@ -310,7 +310,7 @@ static int __maybe_unused rwdt_suspend(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused rwdt_resume(struct device *dev)
+static int rwdt_resume(struct device *dev)
 {
 	struct rwdt_priv *priv = dev_get_drvdata(dev);
 
@@ -320,7 +320,7 @@ static int __maybe_unused rwdt_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(rwdt_pm_ops, rwdt_suspend, rwdt_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(rwdt_pm_ops, rwdt_suspend, rwdt_resume);
 
 static const struct of_device_id rwdt_ids[] = {
 	{ .compatible = "renesas,rcar-gen2-wdt", },
@@ -334,7 +334,7 @@ static struct platform_driver rwdt_driver = {
 	.driver = {
 		.name = "renesas_wdt",
 		.of_match_table = rwdt_ids,
-		.pm = &rwdt_pm_ops,
+		.pm = pm_sleep_ptr(&rwdt_pm_ops),
 	},
 	.probe = rwdt_probe,
 	.remove = rwdt_remove,