// export to HAL
    hm2->hm2dpll.pins = hal_malloc(sizeof(hm2_hm2dpll_pins_t));
...
    r += hal_pin_float_newf(HAL_IN, &(hm2->hm2dpll.pins->base_freq),
            hm2->llio->comp_id, "%s.hm2dpll.base-freq", hm2->llio->name);
...
    r += hal_pin_u32_newf(HAL_IN, &(hm2->hm2dpll.pins->ddssize),
            hm2->llio->comp_id, "%s.hm2dpll.ddsize", hm2->llio->name);
    r += hal_pin_u32_newf(HAL_IN, &(hm2->hm2dpll.pins->prescale),
            hm2->llio->comp_id, "%s.hm2dpll.prescale", hm2->llio->name);
...

void hm2_hm2dpll_write(hostmot2_t *hm2, long period) {
    hm2_hm2dpll_pins_t *pins;
    double period_ms = period / 1000;
    u32 buff;

    if (hm2->hm2dpll.num_instances == 0) return;

     pins = hm2->hm2dpll.pins;

    buff = (u32)(*hm2->hm2dpll.pins->base_freq * period * 1e-6)
                    / (( 1 << *pins->ddssize) * *pins->prescale);
    if (buff != hm2->hm2dpll.base_rate_written){
        hm2->llio->write(hm2->llio,
                hm2->hm2dpll.base_rate_addr,
                &buff,
                sizeof(u32));
        HM2_PRINT("setting base rate to %08x\n", buff);
        hm2->hm2dpll.base_rate_written= buff;
    }