pcm512x_dac_max
unsigned long dac_mul = pcm512x_dac_max(pcm512x, 6144000)
if (sample_rate <= pcm512x_dac_max(pcm512x, 48000))
else if (sample_rate <= pcm512x_dac_max(pcm512x, 96000))
else if (sample_rate <= pcm512x_dac_max(pcm512x, 192000))
return pcm512x_dac_max(pcm512x, 1536000);
for (dac_rate = rounddown(pcm512x_dac_max(pcm512x, 6144000), osr_rate);