--- zzzz-none-000/linux-4.4.271/include/linux/device.h	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/include/linux/device.h	2023-04-19 10:22:30.000000000 +0000
@@ -41,6 +41,7 @@
 struct fwnode_handle;
 struct iommu_ops;
 struct iommu_group;
+struct iommu_fwspec;
 
 struct bus_attribute {
 	struct attribute	attr;
@@ -149,6 +150,8 @@
 struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
 void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
 
+int device_match_of_node(struct device *dev, const void *np);
+
 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
 		     int (*fn)(struct device *dev, void *data));
 struct device *bus_find_device(struct bus_type *bus, struct device *start,
@@ -448,6 +451,18 @@
 					struct device *start, const void *data,
 					int (*match)(struct device *, const void *));
 
+/**
+ * class_find_device_by_of_node : device iterator for locating a particular device
+ * matching the of_node.
+ * @class: class type
+ * @np: of_node of the device to match.
+ */
+static inline struct device *
+class_find_device_by_of_node(struct class *class, const struct device_node *np)
+{
+	return class_find_device(class, NULL, np, device_match_of_node);
+}
+
 struct class_attribute {
 	struct attribute attr;
 	ssize_t (*show)(struct class *class, struct class_attribute *attr,
@@ -752,6 +767,7 @@
  * 		gone away. This should be set by the allocator of the
  * 		device (i.e. the bus driver that discovered the device).
  * @iommu_group: IOMMU group the device belongs to.
+ * @iommu_fwspec: IOMMU-specific properties supplied by firmware.
  *
  * @offline_disabled: If set, the device is permanently online.
  * @offline:	Set after successful invocation of bus type's .offline().
@@ -836,6 +852,7 @@
 
 	void	(*release)(struct device *dev);
 	struct iommu_group	*iommu_group;
+	struct iommu_fwspec	*iommu_fwspec;
 
 	bool			offline_disabled:1;
 	bool			offline:1;