As title, I'v successfully setup EFI with opencore 0.8.5 for a touchpad on Latitude 5510 working
You have to use SSDTS attached and kexts attached, but you must disable Voodooinput.kext, VoodooPS2Mouse.kex and VoodooPS2Trackpad.kext from VoodooPS2Controller kext as you can see on screenshoot.
You have to add to bootargs this string
-vi2c-force-polling
Hope It Helps
SSDTS-touchpad-L5510.zip
Kexts.zip