setting or enabling EXTCLK in dm365

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