Regarding Chipset selection By the driver

[malepati vishnuvardhan]

Hi,
I wanted to know how driver selects the particular chipset.
For example,
I have AR9287 chipset installed, But the driver (ath) has code related to
all the Chipset versions. I'm new to all these stuff, and I'm unable to
trace the flow of driver registration. Please provide me some information
regarding the same.

Thanks and Regards,
Vishnu