CDCLK_SQUASH_WAVEFORM_MASK
waveform = REG_FIELD_GET(CDCLK_SQUASH_WAVEFORM_MASK, squash_ctl) >> (16 - size);
#define CDCLK_SQUASH_WAVEFORM(x) REG_FIELD_PREP(CDCLK_SQUASH_WAVEFORM_MASK, (x))