For my reference, here is the layout of the Kedei 3.5 inch LCD for Raspberry Pi

Kedei LCD Website

Kedei LCD Pin RPi Pin RPi Pin Name
GND 20 GND
IRQ 22 GPIO25
T_CS 24 GPIO08
L_CS 26 GPIO07
MOSI 19 GPIO10
MISO 21 GPIO09
CLK 23 GPIO11
GND 25 GND