1. Yes, TI_ST driver was designed and developed to work with ANY WL family of chipsets which expose UART interface for either BT, FM or GPS.
2. No, Using dedicated UART s/w solutions like hciattach + HCI-UART (HCI-LL) drivers or Using ti-st & btwilink driver will make
use of same firmware (named TIInit_X.X.X.bts), TI-ST makes use of kernel firmware class, hciattach does it from user-space.
3. Yes, It will.
few other added advantages :-
* TI-ST driver provides or combines few things together, i.e It will to begin with toggle the BT_EN line
(populated by adding right platform entries). By using hciattach + HCI-LL solution, you'll have to have your own
wl127x-rfkill sort of gpio toggling driver to do this.
* It will also download firmware (which is done by hciattach), It takes in 1 baud-rate argument and makes sure both
chip and host are set to it, unlike hciattach which requires a specific firmware for specific baud-rates.
* It will also handle HCI_LL messages, which is also done by using hciattach + HCI-LL driver (Not with hciattach + HCI-H4 driver).
* Has been in more products than hciattach + HCI-LL solution !!