iommu/tegra: Convert to probe/release_device() call-backs

Convert the Tegra IOMMU drivers to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20200429133712.31431-27-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/tegra-gart.c

@@ -243,28 +243,16 @@ static bool gart_iommu_capable(enum iommu_cap cap)
 	return false;
 }
 
-static int gart_iommu_add_device(struct device *dev)
+static struct iommu_device *gart_iommu_probe_device(struct device *dev)
 {
-	struct iommu_group *group;
-
 	if (!dev_iommu_fwspec_get(dev))
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-
-	iommu_group_put(group);
-
-	iommu_device_link(&gart_handle->iommu, dev);
-
-	return 0;
+	return &gart_handle->iommu;
 }
 
-static void gart_iommu_remove_device(struct device *dev)
+static void gart_iommu_release_device(struct device *dev)
 {
-	iommu_group_remove_device(dev);
-	iommu_device_unlink(&gart_handle->iommu, dev);
 }
 
 static int gart_iommu_of_xlate(struct device *dev,
@@ -290,8 +278,8 @@ static const struct iommu_ops gart_iommu_ops = {
 	.domain_free	= gart_iommu_domain_free,
 	.attach_dev	= gart_iommu_attach_dev,
 	.detach_dev	= gart_iommu_detach_dev,
-	.add_device	= gart_iommu_add_device,
-	.remove_device	= gart_iommu_remove_device,
+	.probe_device	= gart_iommu_probe_device,
+	.release_device	= gart_iommu_release_device,
 	.device_group	= generic_device_group,
 	.map		= gart_iommu_map,
 	.unmap		= gart_iommu_unmap,

drivers/iommu/tegra-smmu.c

@@ -757,11 +757,10 @@ static int tegra_smmu_configure(struct tegra_smmu *smmu, struct device *dev,
 	return 0;
 }
 
-static int tegra_smmu_add_device(struct device *dev)
+static struct iommu_device *tegra_smmu_probe_device(struct device *dev)
 {
 	struct device_node *np = dev->of_node;
 	struct tegra_smmu *smmu = NULL;
-	struct iommu_group *group;
 	struct of_phandle_args args;
 	unsigned int index = 0;
 	int err;
@@ -774,7 +773,7 @@ static int tegra_smmu_add_device(struct device *dev)
 			of_node_put(args.np);
 
 			if (err < 0)
-				return err;
+				return ERR_PTR(err);
 
 			/*
 			 * Only a single IOMMU master interface is currently
@@ -783,8 +782,6 @@ static int tegra_smmu_add_device(struct device *dev)
 			 */
 			dev->archdata.iommu = smmu;
 
-			iommu_device_link(&smmu->iommu, dev);
-
 			break;
 		}
 
@@ -793,26 +790,14 @@ static int tegra_smmu_add_device(struct device *dev)
 	}
 
 	if (!smmu)
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-
-	iommu_group_put(group);
-
-	return 0;
+	return &smmu->iommu;
 }
 
-static void tegra_smmu_remove_device(struct device *dev)
+static void tegra_smmu_release_device(struct device *dev)
 {
-	struct tegra_smmu *smmu = dev->archdata.iommu;
-
-	if (smmu)
-		iommu_device_unlink(&smmu->iommu, dev);
-
 	dev->archdata.iommu = NULL;
-	iommu_group_remove_device(dev);
 }
 
 static const struct tegra_smmu_group_soc *
@@ -895,8 +880,8 @@ static const struct iommu_ops tegra_smmu_ops = {
 	.domain_free = tegra_smmu_domain_free,
 	.attach_dev = tegra_smmu_attach_dev,
 	.detach_dev = tegra_smmu_detach_dev,
-	.add_device = tegra_smmu_add_device,
-	.remove_device = tegra_smmu_remove_device,
+	.probe_device = tegra_smmu_probe_device,
+	.release_device = tegra_smmu_release_device,
 	.device_group = tegra_smmu_device_group,
 	.map = tegra_smmu_map,
 	.unmap = tegra_smmu_unmap,
@@ -1015,7 +1000,7 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
 	 * value. However the IOMMU registration process will attempt to add
 	 * all devices to the IOMMU when bus_set_iommu() is called. In order
 	 * not to rely on global variables to track the IOMMU instance, we
-	 * set it here so that it can be looked up from the .add_device()
+	 * set it here so that it can be looked up from the .probe_device()
 	 * callback via the IOMMU device's .drvdata field.
 	 */
 	mc->smmu = smmu;