Dear all, I am trying to test a dummy UIO driver to get timer interrupt events in Userspace. I register the UIO driver as a platform driver: static struct platform_device *uio_dummy_device; static struct device_driver uio_dummy_driver = { .name = "uio_dummy", .bus = &platform_bus_type, .probe = uio_dummy_probe, .remove = uio_dummy_remove, .shutdown = uio_dummy_shutdown, }; /* * Main initialization/remove routines */ static int __init uio_dummy_init(void) { printk("uio_dummy_init( )\n" ); uio_dummy_device = platform_device_register_simple("uio_dummy", -1, NULL, 0); if (IS_ERR(uio_dummy_device)) return PTR_ERR(uio_dummy_device); return driver_register(&uio_dummy_driver); } So after the driver_register() My probe should be called but it isn't. Why is this happening. Thanks Nayan