我找到答案了
http://www.fsl.cs.sunysb.edu/kernel-api/re941.html
上面链接中有这样一句:
The name of this device has nothing to do with the name of the device in /dev. It only helps to keep track of the different owners of devices. If your module name has only one type of devices it's ok to use e.g. the name of the module here.