Merge commit 'v3.15' into next

1 files changed, 27 insertions, 1 deletions

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 9bcf2cf19357..5aeb89411350 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -364,7 +364,7 @@ int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
 
 		memset(r, 0, sizeof(*r));
 		/*
-		 * Get optional "interrupts-names" property to add a name
+		 * Get optional "interrupt-names" property to add a name
 		 * to the resource.
 		 */
 		of_property_read_string_index(dev, "interrupt-names", index,
@@ -380,6 +380,32 @@ 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
  */