quoted

+
+#ifdef CONFIG_PM

Should it not be CONFIG_PM_SLEEP instead of just CONFIG_PM? 

quoted

+
+static int omap_usb2_runtime_suspend(struct device *dev)
+{
+	struct platform_device	*pdev = to_platform_device(dev);
+	struct omap_usb	*phy = platform_get_drvdata(pdev);
+

quoted

+static int __init usb2_omap_init(void)
+{
+	return platform_driver_register(&omap_usb2_driver);
+}
+arch_initcall(usb2_omap_init);
+
+static void __exit usb2_omap_exit(void)
+{
+	platform_driver_unregister(&omap_usb2_driver);
+}
+module_exit(usb2_omap_exit);
+

Do you really need arch_initcall here?
If not, then you can replace above two function calls with module_platform_driver().

quoted

+MODULE_ALIAS("platform: omap_usb2");
+MODULE_AUTHOR("Texas Instruments Inc.");
+MODULE_DESCRIPTION("OMAP USB2 PHY DRIVER");