Patch "device property: Add fwnode_irq_get_byname" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    device property: Add fwnode_irq_get_byname

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     device-property-add-fwnode_irq_get_byname.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 1fe7f272c6f163620087ea7a5e49eb43b729ef7e
Author: Akhil R <akhilrajeev@xxxxxxxxxx>
Date:   Fri Jan 28 17:14:25 2022 +0530

    device property: Add fwnode_irq_get_byname
    
    [ Upstream commit ca0acb511c21738b32386ce0f85c284b351d919e ]
    
    Add fwnode_irq_get_byname() to get an interrupt by name from either
    ACPI table or Device Tree, whichever is used for enumeration.
    
    In the ACPI case, this allow us to use 'interrupt-names' in
    _DSD which can be mapped to Interrupt() resource by index.
    The implementation is similar to 'interrupt-names' in the
    Device Tree.
    
    Signed-off-by: Akhil R <akhilrajeev@xxxxxxxxxx>
    Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
    Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
    Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
    Stable-dep-of: 8d3cefaf6592 ("i2c: core: Lock address during client device instantiation")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 87bb97e12749e..ff1be3e311eeb 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1066,6 +1066,35 @@ void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index)
 }
 EXPORT_SYMBOL(fwnode_iomap);
 
+/**
+ * fwnode_irq_get_byname - Get IRQ from a fwnode using its name
+ * @fwnode:	Pointer to the firmware node
+ * @name:	IRQ name
+ *
+ * Description:
+ * Find a match to the string @name in the 'interrupt-names' string array
+ * in _DSD for ACPI, or of_node for Device Tree. Then get the Linux IRQ
+ * number of the IRQ resource corresponding to the index of the matched
+ * string.
+ *
+ * Return:
+ * Linux IRQ number on success, or negative errno otherwise.
+ */
+int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name)
+{
+	int index;
+
+	if (!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 032262e3d9991..840f0545d4f9d 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -125,6 +125,7 @@ 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);
 
 void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index);