[PATCH v2 1/3] device property: Add device_irq_get_byname

Akhil R
2022-01-12T14:14:58Z

Get interrupt by name from ACPI table as well.

Add option to use 'interrupt-names' in _DSD which can map to interrupt by
index. The implementation is similar to 'interrupt-names' in devicetree.
Also add a common routine to get irq by name from devicetree and ACPI
table.

Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
---
drivers/base/property.c | 35 +++++++++++++++++++++++++++++++++++
include/linux/property.h | 3 +++
2 files changed, 38 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index cbe4fa2..414c316 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -920,6 +920,41 @@ int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index)
EXPORT_SYMBOL(fwnode_irq_get);

/**
+ * fwnode_irq_get_byname - Get IRQ from a fwnode using its name
+ * @fwnode: Pointer to the firmware node
+ * @name: IRQ name in interrupt-names property in fwnode
+ *
+ * Returns Linux IRQ number on success, errno otherwise.
+ */
+int fwnode_irq_get_byname(const 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);
+
+/**
+ * device_irq_get_byname - Get IRQ of a device using interrupt name
+ * @dev: Device to get the interrupt
+ * @name: IRQ name in interrupt-names property in fwnode
+ *
+ * Returns Linux IRQ number on success, errno otherwise.
+ */
+int device_irq_get_byname(struct device *dev, const char *name)
+{
+ return fwnode_irq_get_byname(dev_fwnode(dev), name);
+}
+EXPORT_SYMBOL_GPL(device_irq_get_byname);
+
+/**
* fwnode_graph_get_next_endpoint - Get next endpoint firmware node
* @fwnode: Pointer to the parent firmware node
* @prev: Previous endpoint node or %NULL to get the first
diff --git a/include/linux/property.h b/include/linux/property.h
index 16f736c..bc49350 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -121,6 +121,9 @@ struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
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(const struct fwnode_handle *fwnode, const char *name);
+
+int device_irq_get_byname(struct device *dev, const char *name);

unsigned int device_get_child_node_count(struct device *dev);

--
2.7.4