Raspberry pi user can refer below link to interface 3.5 inch TFT (tinylcd35) on pi
https://github.com/notro/fbtft/wiki/LCD-Modules
https://github.com/notro/fbtft/wiki
https://github.com/notro/rpi-firmware
Raspberry pi connection details
RPi 3.5'' TFT
pin1 3V3 ------------------------------------- TFT 3V3
pin18 GPIO 24 ----------------------------- TFT RS
pin19 GPIO 10 MOSI -------------------- TFT MOSI
pin24 GPIO 08 CE0 ---------------------- TFT CS
pin23 GPIO 11 CLK ---------------------- TFT SCLK
pin22 GPIO 25 ----------------------------- TFT RST
pin12 GPIO 18 PWM -------------------- TFT BL
pin6 GND ------------------------------------ TFT GND
we provide C source code for 8051 processor