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omap-4460 rpmsg_omx

Hi,
I'm working with omap4 and camera drivers. The one I have been using is rpmsg_omx. Default configuration works good, but my problem is to change pinmux, Precisely PDWN pin. (change LOW to HI during recording and from Hi to Low after that). 
I download kernel:

 git clone git://dev.omapzoom.org/pub/scm/integration/kernel-ubuntu.git

and see that there are files like:
rpmsg_omx.h
rpmsg_omx.c
but they don't define which GPIO they are using (default gpio_175 and I want to change it to gpio_50). Neither they define rest CSI-2 pins (although I connect them same as default setting).
I'm stuck 2nd day trying to find it, but I am lost now :)
Can sb tell me ( or give me a hint) where should I look for declaration which pins I am using?