iommu: constify fwnode in iommu_ops_from_fwnode()

Make pointer to fwnode_handle a pointer to const for code safety.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

Author: krzk

drivers/iommu/iommu.c

@@ -2774,7 +2774,7 @@ bool iommu_default_passthrough(void)
 }
 EXPORT_SYMBOL_GPL(iommu_default_passthrough);
 
-const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
+const struct iommu_ops *iommu_ops_from_fwnode(const struct fwnode_handle *fwnode)
 {
 	const struct iommu_ops *ops = NULL;
 	struct iommu_device *iommu;

include/linux/iommu.h

@@ -986,7 +986,7 @@ int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 		      const struct iommu_ops *ops);
 void iommu_fwspec_free(struct device *dev);
 int iommu_fwspec_add_ids(struct device *dev, const u32 *ids, int num_ids);
-const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
+const struct iommu_ops *iommu_ops_from_fwnode(const struct fwnode_handle *fwnode);
 
 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
 {
@@ -1309,7 +1309,7 @@ static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
 }
 
 static inline
-const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
+const struct iommu_ops *iommu_ops_from_fwnode(const struct fwnode_handle *fwnode)
 {
 	return NULL;
 }