how to enable LCD Touch Controller

Hi every body
i have build my lcd7 cape depends on 4D System Schematic and enabling the BB-BONE-LCD7-01 overlay manually .
my questions is :
1- does the BB-BONE-LCD7-01 overlay enabling the touch controller by it self ?
i open the BB-BONE-LCD7-01-00A2.dts and read the device tree , i don’t see any thing that related to touch screen pins

2- if the BB-BONE-LCD7-01 overlay doesn’t enabling the touch screen controller by it self ,so what is the overlay that i have to load to make touch controller works ?
(i have 4 pins in the lcd panel for touch XR,YD,XL,YU) .

Thanks in advance