Aaron Tilley, Forbes:
At Apple’s developers conference in June, Apple announced its program for hooking up smart home devices seamlessly in iOS with Bluetooth and Wifi. But in order for device makers to get on board, they have to go through one thing: Apple certification. And one part of the certification process for device makers is that they have to buy their Bluetooth and Wifi chips from Apple-approved chipmakers Texas Instruments, Marvell and Broadcom.
These chipmakers have begun shipping their chips loaded with HomeKit firmware to device manufacturers, Broadcom and Texas Instruments have confirmed to me.
- Kevin McLaughlin's "Introducing HomeKit" from Apple's WWDC is a great overview of HomeKit (40 minute video).