usb/host: ehci-platform: 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-platform.c

···
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int ehci_platform_suspend(struct device *dev)
+static int __maybe_unused ehci_platform_suspend(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 	struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
···
 	return ret;
 }
 
-static int ehci_platform_resume(struct device *dev)
+static int __maybe_unused ehci_platform_resume(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 	struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
···
 
 	return 0;
 }
-#endif /* CONFIG_PM_SLEEP */
 
 static const struct of_device_id vt8500_ehci_ids[] = {
 	{ .compatible = "via,vt8500-ehci", },
···
 	.shutdown	= usb_hcd_platform_shutdown,
 	.driver		= {
 		.name	= "ehci-platform",
-		.pm	= &ehci_platform_pm_ops,
+		.pm	= pm_ptr(&ehci_platform_pm_ops),
 		.of_match_table = vt8500_ehci_ids,
 		.acpi_match_table = ACPI_PTR(ehci_acpi_match),
 	}