iommu: Add iommu_device_set_fwnode() interface

Allow to store a fwnode in 'struct iommu_device';
Signed-off-by: Joerg Roedel <jroedel@suse.de>

include/linux/iommu.h

@@ -214,6 +214,7 @@ struct iommu_ops {
 struct iommu_device {
 	struct list_head list;
 	const struct iommu_ops *ops;
+	struct fwnode_handle *fwnode;
 	struct device dev;
 };
 
@@ -233,6 +234,12 @@ static inline void iommu_device_set_ops(struct iommu_device *iommu,
 	iommu->ops = ops;
 }
 
+static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
+					   struct fwnode_handle *fwnode)
+{
+	iommu->fwnode = fwnode;
+}
+
 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE		1 /* Device added */
 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE		2 /* Pre Device removed */
 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER		3 /* Pre Driver bind */
@@ -580,6 +587,11 @@ static inline void iommu_device_set_ops(struct iommu_device *iommu,
 {
 }
 
+static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
+					   struct fwnode_handle *fwnode)
+{
+}
+
 static inline void iommu_device_unregister(struct iommu_device *iommu)
 {
 }