C20_MULTIPLIER_MASK
multiplier = REG_FIELD_GET(C20_MULTIPLIER_MASK, pll_state->mpllb[0]);
multiplier = REG_FIELD_GET(C20_MULTIPLIER_MASK, pll_state->mplla[0]);
#define MPLL_MULTIPLIER(val) REG_FIELD_PREP16(C20_MULTIPLIER_MASK, val)