div_up
unsigned long div, div_up;
div_up = clamp_val(div + 1, divider_min, divider_max);
divided_rate_down = parent_rate / div_up;
cv1800_clk_setbit(&aclk->common, &aclk->div_up);
.div_up = CV1800_CLK_BIT(_div_up_reg, \
struct cv1800_clk_regbit div_up;
t.max = div_up(best_num, best_den);
den = div_up(num, q);
t.max = div_up(best_num, best_den);