get_div
div = get_div(double_div->reg1, double_div->shift1);
div *= get_div(double_div->reg2, double_div->shift2);
div = get_div(pm_cpu->reg_div, pm_cpu->shift_div);
div = get_div(divider, req->rate, output_rate);
div = get_div(divider, rate, parent_rate);