usb/host: ehci-spear: Use pm_ptr() macro

Use the newly introduced pm_ptr() macro, and mark the suspend/resume
functions __maybe_unused. These functions can then be moved outside the
CONFIG_PM_SUSPEND block, and the compiler can then process them and
detect build failures independently of the config. If unused, they will
simply be discarded by the compiler.

Signed-off-by: Paul Cercueil <[e-mail]>
Acked-by: Alan Stern <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/host/ehci-spear.c

···
 
 static struct hc_driver __read_mostly ehci_spear_hc_driver;
 
-#ifdef CONFIG_PM_SLEEP
-static int ehci_spear_drv_suspend(struct device *dev)
+static int __maybe_unused ehci_spear_drv_suspend(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 	bool do_wakeup = device_may_wakeup(dev);
···
 	return ehci_suspend(hcd, do_wakeup);
 }
 
-static int ehci_spear_drv_resume(struct device *dev)
+static int __maybe_unused ehci_spear_drv_resume(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 
 	ehci_resume(hcd, false);
 	return 0;
 }
-#endif /* CONFIG_PM_SLEEP */
 
 static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
 		ehci_spear_drv_resume);
···
 	.driver		= {
 		.name = "spear-ehci",
 		.bus = &platform_bus_type,
-		.pm = &ehci_spear_pm_ops,
+		.pm = pm_ptr(&ehci_spear_pm_ops),
 		.of_match_table = spear_ehci_id_table,
 	}
 };