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

Convert the Mediatek IOMMU driver 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/20200429133712.31431-23-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/mtk_iommu.c

@@ -441,38 +441,26 @@ static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
 	return pa;
 }
 
-static int mtk_iommu_add_device(struct device *dev)
+static struct iommu_device *mtk_iommu_probe_device(struct device *dev)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct mtk_iommu_data *data;
-	struct iommu_group *group;
 
 	if (!fwspec || fwspec->ops != &mtk_iommu_ops)
-		return -ENODEV; /* Not a iommu client device */
+		return ERR_PTR(-ENODEV); /* Not a iommu client device */
 
 	data = dev_iommu_priv_get(dev);
-	iommu_device_link(&data->iommu, dev);
 
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-
-	iommu_group_put(group);
-	return 0;
+	return &data->iommu;
 }
 
-static void mtk_iommu_remove_device(struct device *dev)
+static void mtk_iommu_release_device(struct device *dev)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
-	struct mtk_iommu_data *data;
 
 	if (!fwspec || fwspec->ops != &mtk_iommu_ops)
 		return;
 
-	data = dev_iommu_priv_get(dev);
-	iommu_device_unlink(&data->iommu, dev);
-
-	iommu_group_remove_device(dev);
 	iommu_fwspec_free(dev);
 }
 
@@ -526,8 +514,8 @@ static const struct iommu_ops mtk_iommu_ops = {
 	.flush_iotlb_all = mtk_iommu_flush_iotlb_all,
 	.iotlb_sync	= mtk_iommu_iotlb_sync,
 	.iova_to_phys	= mtk_iommu_iova_to_phys,
-	.add_device	= mtk_iommu_add_device,
-	.remove_device	= mtk_iommu_remove_device,
+	.probe_device	= mtk_iommu_probe_device,
+	.release_device	= mtk_iommu_release_device,
 	.device_group	= mtk_iommu_device_group,
 	.of_xlate	= mtk_iommu_of_xlate,
 	.pgsize_bitmap	= SZ_4K | SZ_64K | SZ_1M | SZ_16M,