REG_CLKRC
ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
{ REG_CLKRC, 0x1 }, /* OV: clock scale (30 fps) */
ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
return ov7670_write(sd, REG_CLKRC, info->clkrc);
ret = ov965x_write(ov965x, REG_CLKRC, reg);