Hi tony
first please enable csi, refer to imx6ul-14x14-evk-csi.dts :
http://git.freescale.com/git/cgit.cgi/imx/linux-imx.git/tree/arch/arm/boot/dts/imx6ul-14x14-evk-csi....
Clocks are configured using linux common clock framework which is described in
https://www.kernel.org/doc/Documentation/clk.txt
http://elinux.org/images/b/b8/Elc2013_Clement.pdf
Best regards
igor
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