MIPI DSI (Display Serial Interface)：
The display Connector is a 40-pin FPC connector which can connect external LCD panel (MIPI DSI) and touch screen (I2C) module as well. The pin definitions of this connector are shown as below. This is marked on the Banana Pi board as “DSI”.
DSI pin define:
please see: BPI-M2 Ultra GPIO pine define
BPI-M2 Ultra LCD touch panel accessories same as BPI-M3
note:the touch panel accessories support RGB interface and MIPI interface ,when you use BPI-M2 Ultra, please choose MIPI interface.