of/irq: do irq resolution in platform_get_irq

[karo-tx-linux.git] / drivers / of / irq.c

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 9bcf2cf19357837dcb6dd8e5cce637150a7a32d0..ca0189308d72025f61406d4440b20f7486fda99e 100644 (file)
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -379,6 +379,32 @@ int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
 }
 EXPORT_SYMBOL_GPL(of_irq_to_resource);
 
+/**
+ * of_irq_get - Decode a node's IRQ and return it as a Linux irq number
+ * @dev: pointer to device tree node
+ * @index: zero-based index of the irq
+ *
+ * Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain
+ * is not yet created.
+ *
+ */
+int of_irq_get(struct device_node *dev, int index)
+{
+       int rc;
+       struct of_phandle_args oirq;
+       struct irq_domain *domain;
+
+       rc = of_irq_parse_one(dev, index, &oirq);
+       if (rc)
+               return rc;
+
+       domain = irq_find_host(oirq.np);
+       if (!domain)
+               return -EPROBE_DEFER;
+
+       return irq_create_of_mapping(&oirq);
+}
+
 /**
  * of_irq_count - Count the number of IRQs a node uses
  * @dev: pointer to device tree node