OLED Display -- Framebuffer driver to DRM driver conversion required???

Hi, In my project (Arm processor based), we are using 2 displays. Primary display is for Ubuntu 16.04 OS Gui display and secondary display is for status messages, some small OLED display. This OLED display is framebuffer driver based. My doubt is: 1. Whether I need to convert this framebuffer driver to DRM driver? Is this required? What is the advantages of this? Please provide some inputs on this. -Thanks.