dac_set_freq
int (*dac_set_freq)(struct dac_info *info, int channel, u32 freq);
return info->dacops->dac_set_freq(info, channel, freq);
.dac_set_freq = ics5342_set_freq,
int rv = dac_set_freq(par->dac, 0, 1000000000 / pixclock);