from WHERE platform driver's probe is called?

Hello, I am looking into platform driver and devices and understood HOW platform driver's probe is called from kernel doc and following forum.http://comments.gmane.org/gmane.linux.kernel.kernelnewbies/37050 For further information I went through code in platform_driver_register() and got lost. I looked web but could not find substantiation information. I am still not able to locate from WHERE this probe function is called and WHO calls it?Can someone please point to source code or some other document related to this? Thanks,Sunil.