setting or enabling EXTCLK in dm365

hi
using dm365 
in dm365 there is no ispdriver then how to set or enable EXTCLK

like we r using in omap using ispdriver
below is the setting in omap(beagle board) 

/* Enable EXTCLK */
debg(Setting isp xclk);
 if (isp->platform_cb.set_xclk)
isp->platform_cb.set_xclk(isp, 24000000, CAM_USE_XCLKA);

waiting for reply
kailash