irq_set_parent
irq_set_parent(virq, data->irq);
ret = irq_set_parent(irq, gc->irq.parents[0]);
ret = irq_set_parent(irq, gc->irq.map[hwirq]);
irq_set_parent(virq, tps->irq);
irq_set_parent(virq, pdata->twl_irq);
irq_set_parent(irq_create_mapping(priv->irqdomain, 0), irq);
irq_set_parent(irq, mb->irq);
irq_set_parent(virq, irq);
irq_set_parent(irq_create_mapping(priv->irqdomain, i), irq);
int irq_set_parent(int irq, int parent_irq);
EXPORT_SYMBOL_GPL(irq_set_parent);