platform device <==> platform driver

platform_driver_register(struct platform_driver *drv)注册后如何找到驱动匹配的设备：

do_basic_setup()->driver_init()->platform_bus_init()->...初始化platform bus(虚拟总线)
设备向内核注册的时候platform_device_register()->platform_device_add()->...内核把设备挂在虚拟的platform bus下
驱动注册的时候platform_driver_register()->driver_register()->bus_add_driver()->driver_attach()->bus_for_each_dev()对每个挂在虚拟的platform bus的设备作__driver_attach()->driver_probe_device()->drv->bus->match()==platform_match()->比较strncmp(pdev->name, drv->name, BUS_ID_SIZE)，如果相符就调用platform_drv_probe()->driver->probe()，如果probe成功则绑定该设备到该驱动.