GT_CONTROL_PRESCALER_MASK
reg &= ~GT_CONTROL_PRESCALER_MASK;
reg |= FIELD_PREP(GT_CONTROL_PRESCALER_MASK, psv);
return FIELD_GET(GT_CONTROL_PRESCALER_MASK, reg);
writel(FIELD_PREP(GT_CONTROL_PRESCALER_MASK, psv - 1) |
if (!FIELD_FIT(GT_CONTROL_PRESCALER_MASK, psv))