REG_CHAN_INTSTATUS
ad->base + REG_CHAN_INTSTATUS(adchan->no, ad->irq_index));
ad->base + REG_CHAN_INTSTATUS(channo, ad->irq_index));
u32 cause = readl_relaxed(ad->base + REG_CHAN_INTSTATUS(no, ad->irq_index));