rtc: omap: mark PM methods as __maybe_unused

Instead of using #ifdef guards around PM methods, let's annotate
them as __maybe_unused, as it provides better compile coverage.

Also drop empty stub for omap_rtc_runtime_resume().
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-omap.c

@@ -882,8 +882,7 @@ static int omap_rtc_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int omap_rtc_suspend(struct device *dev)
+static int __maybe_unused omap_rtc_suspend(struct device *dev)
 {
 	struct omap_rtc *rtc = dev_get_drvdata(dev);
 
@@ -906,7 +905,7 @@ static int omap_rtc_suspend(struct device *dev)
 	return 0;
 }
 
-static int omap_rtc_resume(struct device *dev)
+static int __maybe_unused omap_rtc_resume(struct device *dev)
 {
 	struct omap_rtc *rtc = dev_get_drvdata(dev);
 
@@ -921,10 +920,8 @@ static int omap_rtc_resume(struct device *dev)
 
 	return 0;
 }
-#endif
 
-#ifdef CONFIG_PM
-static int omap_rtc_runtime_suspend(struct device *dev)
+static int __maybe_unused omap_rtc_runtime_suspend(struct device *dev)
 {
 	struct omap_rtc *rtc = dev_get_drvdata(dev);
 
@@ -934,16 +931,9 @@ static int omap_rtc_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int omap_rtc_runtime_resume(struct device *dev)
-{
-	return 0;
-}
-#endif
-
 static const struct dev_pm_ops omap_rtc_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(omap_rtc_suspend, omap_rtc_resume)
-	SET_RUNTIME_PM_OPS(omap_rtc_runtime_suspend,
-			   omap_rtc_runtime_resume, NULL)
+	SET_RUNTIME_PM_OPS(omap_rtc_runtime_suspend, NULL, NULL)
 };
 
 static void omap_rtc_shutdown(struct platform_device *pdev)