watchdog: dw_wdt: Remove #ifdef guards for PM related functions

Use the new 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 #ifdef guards. Not using #ifdef guards means that the code is
always compiled independently of any Kconfig option, and thanks to that
bugs and regressions are easier to catch.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220628193449.160585-3-paul@crapouillou.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

drivers/watchdog/dw_wdt.c

@@ -375,7 +375,6 @@ static irqreturn_t dw_wdt_irq(int irq, void *devid)
 	return IRQ_HANDLED;
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int dw_wdt_suspend(struct device *dev)
 {
 	struct dw_wdt *dw_wdt = dev_get_drvdata(dev);
@@ -410,9 +409,8 @@ static int dw_wdt_resume(struct device *dev)
 
 	return 0;
 }
-#endif /* CONFIG_PM_SLEEP */
 
-static SIMPLE_DEV_PM_OPS(dw_wdt_pm_ops, dw_wdt_suspend, dw_wdt_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(dw_wdt_pm_ops, dw_wdt_suspend, dw_wdt_resume);
 
 /*
  * In case if DW WDT IP core is synthesized with fixed TOP feature disabled the
@@ -710,7 +708,7 @@ static struct platform_driver dw_wdt_driver = {
 	.driver		= {
 		.name	= "dw_wdt",
 		.of_match_table = of_match_ptr(dw_wdt_of_match),
-		.pm	= &dw_wdt_pm_ops,
+		.pm	= pm_sleep_ptr(&dw_wdt_pm_ops),
 	},
 };