IMX274_PIXCLK_CONST1
coarse_time = (IMX274_PIXCLK_CONST1 / IMX274_PIXCLK_CONST2 * val
/ (IMX274_PIXCLK_CONST1 / IMX274_PIXCLK_CONST2);
frame_length = IMX274_PIXCLK_CONST1 / (svr + 1) / hmax