irqchip/nvic: Use irq_domain_translate_onecell instead of custom func

Make use of newly introduced irq_domain_translate_onecell() instead of
custom made function.
Signed-off-by: Yash Shah <yash.shah@sifive.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1575976274-13487-3-git-send-email-yash.shah@sifive.com

drivers/irqchip/irq-nvic.c

@@ -45,17 +45,6 @@ nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)
 	handle_IRQ(irq, regs);
 }
 
-static int nvic_irq_domain_translate(struct irq_domain *d,
-				     struct irq_fwspec *fwspec,
-				     unsigned long *hwirq, unsigned int *type)
-{
-	if (WARN_ON(fwspec->param_count < 1))
-		return -EINVAL;
-	*hwirq = fwspec->param[0];
-	*type = IRQ_TYPE_NONE;
-	return 0;
-}
-
 static int nvic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 				unsigned int nr_irqs, void *arg)
 {
@@ -64,7 +53,7 @@ static int nvic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 	unsigned int type = IRQ_TYPE_NONE;
 	struct irq_fwspec *fwspec = arg;
 
-	ret = nvic_irq_domain_translate(domain, fwspec, &hwirq, &type);
+	ret = irq_domain_translate_onecell(domain, fwspec, &hwirq, &type);
 	if (ret)
 		return ret;
 
@@ -75,7 +64,7 @@ static int nvic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 }
 
 static const struct irq_domain_ops nvic_irq_domain_ops = {
-	.translate = nvic_irq_domain_translate,
+	.translate = irq_domain_translate_onecell,
 	.alloc = nvic_irq_domain_alloc,
 	.free = irq_domain_free_irqs_top,
 };