[PATCH v2 1/2] device property: Add fwnode_irq_get_byname()

[Puranjay Mohan]

The fwnode framework did not have means to obtain the IRQ number from
the name of a node.
Add that now, in form of the fwnode_irq_get_byname() function.

Signed-off-by: Puranjay Mohan <puranjay12@xxxxxxxxx>
---
 drivers/base/property.c  | 23 +++++++++++++++++++++++
 include/linux/property.h |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index f1f35b48ab8b..0d685c79b0e8 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -958,6 +958,29 @@ int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index)
 }
 EXPORT_SYMBOL(fwnode_irq_get);
 
+/**
+ * fwnode_irq_get_byname - Get IRQ directly from its name.
+ * @fwnode:    Pointer to the firmware node
+ * @name:      IRQ Name
+ *
+ * Returns Linux IRQ number on success. Other values are determined
+ * accordingly to acpi_/of_ irq_get() operation.
+ */
+int fwnode_irq_get_byname(struct fwnode_handle *fwnode, const char *name)
+{
+	int index;
+
+	if (unlikely(!name))
+		return -EINVAL;
+
+	index = fwnode_property_match_string(fwnode, "interrupt-names", name);
+	if (index < 0)
+		return index;
+
+	return fwnode_irq_get(fwnode, index);
+}
+EXPORT_SYMBOL(fwnode_irq_get_byname);
+
 /**
  * fwnode_graph_get_next_endpoint - Get next endpoint firmware node
  * @fwnode: Pointer to the parent firmware node
diff --git a/include/linux/property.h b/include/linux/property.h
index 88fa726a76df..9c6177597ba8 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -122,6 +122,8 @@ void fwnode_handle_put(struct fwnode_handle *fwnode);
 
 int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
 
+int fwnode_irq_get_byname(struct fwnode_handle *fwnode, const char *name);
+
 unsigned int device_get_child_node_count(struct device *dev);
 
 static inline bool device_property_read_bool(struct device *dev,
-- 
2.30.1