Repo https://github.com/Freescale/linux-fslc has branches that ends with -imx and branches that ends with -fslc. I suppose that -imx are official Freescale kernels whereas -fslc are supported by community. Are -imx branches merged to -fslc?
Currently I am using Yocto Dunfell with 5.4.x+fslc branch. However this branch does not include folder drivers/video/fbdev/mxc that contains video drivers that I need. On the other hand 5.4-2.1.x-imx does include this folder.