Hi Mike,
Unfortunately current software BSP does not support RAW RGB to YUV422 conversion. There are no any examples.
One needs to add such support himself. Please look at sect
"Color Space Conversion unit - CSC" In the Ref manual
http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6SDLRM.pdf
Refer to your camera brochure, if your camera output is 8bit yuv422, I mx6 can support this format, pls refer to the mx6 Reference Manual, for mx6 CSI, Data formats supported include Raw (Bayer), RGB, YUV 4:4:4, YUV 4:2:2 and grayscale, up to 16 bits per value (component).