Rotate 7" touchscreen of Raspberry PI

• Add parameters to /boot/config.txt

  display_rotate=1
  dtoverlay=rpi-ft5406,touchscreen-swapped-x-y=1,touchscreen-inverted-x=1
  

• Parameters

  Rotate display
  
  display_rotate=0 # normal
  display_rotate=1 # rotate 90°
  display_rotate=2 # rotate 180°
  display_rotate=3 # rotate 270°
  

  Touchscreen
  
  touchscreen-size-x      Touchscreen X resolution, default 800
  touchscreen-size-y      Touchscreen Y resolution, default 600
  touchscreen-inverted-x  Invert touchscreen X coordinates, default 0
  touchscreen-inverted-y  Invert touchscreen Y coordinates, default 0
  touchscreen-swapped-x-y Swap X and Y coordinates, default 0