diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
index ef3ee95706da..eb1e62cd499a 100644
--- a/drivers/iommu/apple-dart.c
+++ b/drivers/iommu/apple-dart.c
@@ -779,7 +779,8 @@ static void apple_dart_domain_free(struct iommu_domain *domain)
 	kfree(dart_domain);
 }
 
-static int apple_dart_of_xlate(struct device *dev, struct of_phandle_args *args)
+static int apple_dart_of_xlate(struct device *dev,
+			       const struct of_phandle_args *args)
 {
 	struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 	struct platform_device *iommu_pdev = of_find_device_by_node(args->np);
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 0ffb1cf17e0b..4434d6a2fc2f 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2739,7 +2739,8 @@ static int arm_smmu_enable_nesting(struct iommu_domain *domain)
 	return ret;
 }
 
-static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
+static int arm_smmu_of_xlate(struct device *dev,
+			     const struct of_phandle_args *args)
 {
 	return iommu_fwspec_add_ids(dev, args->args, 1);
 }
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 68b6bc5e7c71..8e5e4ab5fad3 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1551,7 +1551,8 @@ static int arm_smmu_set_pgtable_quirks(struct iommu_domain *domain,
 	return ret;
 }
 
-static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
+static int arm_smmu_of_xlate(struct device *dev,
+			     const struct of_phandle_args *args)
 {
 	u32 mask, fwid = 0;
 
diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
index 17a1c163fef6..e079bb7a993e 100644
--- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c
+++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
@@ -546,7 +546,8 @@ static struct iommu_device *qcom_iommu_probe_device(struct device *dev)
 	return &qcom_iommu->iommu;
 }
 
-static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
+static int qcom_iommu_of_xlate(struct device *dev,
+			       const struct of_phandle_args *args)
 {
 	struct qcom_iommu_dev *qcom_iommu;
 	struct platform_device *iommu_pdev;
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 2c6e9094f1e9..d98c9161948a 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1431,7 +1431,7 @@ static void exynos_iommu_release_device(struct device *dev)
 }
 
 static int exynos_iommu_of_xlate(struct device *dev,
-				 struct of_phandle_args *spec)
+				 const struct of_phandle_args *spec)
 {
 	struct platform_device *sysmmu = of_find_device_by_node(spec->np);
 	struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 170329a085b8..26a31ba4f72d 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -3038,7 +3038,7 @@ void iommu_fwspec_free(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(iommu_fwspec_free);
 
-int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids)
+int iommu_fwspec_add_ids(struct device *dev, const u32 *ids, int num_ids)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	int i, new_num;
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index ace1fc4bd34b..cd7219319c8b 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -709,7 +709,7 @@ static phys_addr_t ipmmu_iova_to_phys(struct iommu_domain *io_domain,
 }
 
 static int ipmmu_init_platform_device(struct device *dev,
-				      struct of_phandle_args *args)
+				      const struct of_phandle_args *args)
 {
 	struct platform_device *ipmmu_pdev;
 
@@ -773,7 +773,7 @@ static bool ipmmu_device_is_allowed(struct device *dev)
 }
 
 static int ipmmu_of_xlate(struct device *dev,
-			  struct of_phandle_args *spec)
+			  const struct of_phandle_args *spec)
 {
 	if (!ipmmu_device_is_allowed(dev))
 		return -ENODEV;
diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index 67124f4228b1..d4c0f2ad184b 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -588,7 +588,7 @@ static void print_ctx_regs(void __iomem *base, int ctx)
 
 static int insert_iommu_master(struct device *dev,
 				struct msm_iommu_dev **iommu,
-				struct of_phandle_args *spec)
+				const struct of_phandle_args *spec)
 {
 	struct msm_iommu_ctx_dev *master = dev_iommu_priv_get(dev);
 	int sid;
@@ -616,7 +616,7 @@ static int insert_iommu_master(struct device *dev,
 }
 
 static int qcom_iommu_of_xlate(struct device *dev,
-			       struct of_phandle_args *spec)
+			       const struct of_phandle_args *spec)
 {
 	struct msm_iommu_dev *iommu = NULL, *iter;
 	unsigned long flags;
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 7abe9e85a570..955de8fb7732 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -957,7 +957,8 @@ static struct iommu_group *mtk_iommu_device_group(struct device *dev)
 	return group;
 }
 
-static int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
+static int mtk_iommu_of_xlate(struct device *dev,
+			      const struct of_phandle_args *args)
 {
 	struct platform_device *m4updev;
 
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index 25b41222abae..ae16d8238d84 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -398,7 +398,8 @@ static const struct iommu_ops mtk_iommu_v1_ops;
  * MTK generation one iommu HW only support one iommu domain, and all the client
  * sharing the same iova address space.
  */
-static int mtk_iommu_v1_create_mapping(struct device *dev, struct of_phandle_args *args)
+static int mtk_iommu_v1_create_mapping(struct device *dev,
+				       const struct of_phandle_args *args)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct mtk_iommu_v1_data *data;
diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index 2685861c0a12..da79d9f4cf63 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -1140,7 +1140,7 @@ static void rk_iommu_release_device(struct device *dev)
 }
 
 static int rk_iommu_of_xlate(struct device *dev,
-			     struct of_phandle_args *args)
+			     const struct of_phandle_args *args)
 {
 	struct platform_device *iommu_dev;
 	struct rk_iommudata *data;
diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c
index 537359f10997..ba53571a8239 100644
--- a/drivers/iommu/sprd-iommu.c
+++ b/drivers/iommu/sprd-iommu.c
@@ -390,7 +390,8 @@ static struct iommu_device *sprd_iommu_probe_device(struct device *dev)
 	return &sdev->iommu;
 }
 
-static int sprd_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
+static int sprd_iommu_of_xlate(struct device *dev,
+			       const struct of_phandle_args *args)
 {
 	struct platform_device *pdev;
 
diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c
index 41484a5a399b..decd52cba998 100644
--- a/drivers/iommu/sun50i-iommu.c
+++ b/drivers/iommu/sun50i-iommu.c
@@ -819,7 +819,7 @@ static struct iommu_device *sun50i_iommu_probe_device(struct device *dev)
 }
 
 static int sun50i_iommu_of_xlate(struct device *dev,
-				 struct of_phandle_args *args)
+				 const struct of_phandle_args *args)
 {
 	struct platform_device *iommu_pdev = of_find_device_by_node(args->np);
 	unsigned id = args->args[0];
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 310871728ab4..14e525bd0d9b 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -830,7 +830,7 @@ static struct tegra_smmu *tegra_smmu_find(struct device_node *np)
 }
 
 static int tegra_smmu_configure(struct tegra_smmu *smmu, struct device *dev,
-				struct of_phandle_args *args)
+				const struct of_phandle_args *args)
 {
 	const struct iommu_ops *ops = smmu->iommu.ops;
 	int err;
@@ -959,7 +959,7 @@ static struct iommu_group *tegra_smmu_device_group(struct device *dev)
 }
 
 static int tegra_smmu_of_xlate(struct device *dev,
-			       struct of_phandle_args *args)
+			       const struct of_phandle_args *args)
 {
 	struct platform_device *iommu_pdev = of_find_device_by_node(args->np);
 	struct tegra_mc *mc = platform_get_drvdata(iommu_pdev);
diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index 34db37fd9675..04048f64a2c0 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -1051,7 +1051,8 @@ static struct iommu_group *viommu_device_group(struct device *dev)
 		return generic_device_group(dev);
 }
 
-static int viommu_of_xlate(struct device *dev, struct of_phandle_args *args)
+static int viommu_of_xlate(struct device *dev,
+			   const struct of_phandle_args *args)
 {
 	return iommu_fwspec_add_ids(dev, args->args, 1);
 }
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 1ea2a820e1eb..600fc6e6f308 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -468,7 +468,7 @@ struct iommu_ops {
 	/* Request/Free a list of reserved regions for a device */
 	void (*get_resv_regions)(struct device *dev, struct list_head *list);
 
-	int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
+	int (*of_xlate)(struct device *dev, const struct of_phandle_args *args);
 	bool (*is_attach_deferred)(struct device *dev);
 
 	/* Per device IOMMU features */
@@ -902,7 +902,7 @@ struct iommu_mm_data {
 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, u32 *ids, int num_ids);
+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);
 
 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
