sudo -s
i use :
modprobe fbtft_device custom name=fb_ili9341 gpios=reset:0,dc:3 speed=48000000 rotate=90 busnum=0 txbuflen=65536
libkmod: ERROR ../libkmod/libkmod-config.c:635 kmod_config_parse: /etc/modprobe.d/fbtft.conf line 1: ignoring bad line starting with 'modprobe'
modprobe: ERROR: could not insert 'fbtft_device': Invalid argument