iommu/rockchip: Prohibit unbind and remove

Removal of IOMMUs cannot be done reliably.

This is similar to exynos iommu driver.
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/rockchip-iommu.c

@@ -1197,18 +1197,6 @@ static int rk_iommu_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int rk_iommu_remove(struct platform_device *pdev)
-{
-	struct rk_iommu *iommu = platform_get_drvdata(pdev);
-
-	if (iommu) {
-		iommu_device_sysfs_remove(&iommu->iommu);
-		iommu_device_unregister(&iommu->iommu);
-	}
-
-	return 0;
-}
-
 static void rk_iommu_shutdown(struct platform_device *pdev)
 {
 	struct rk_iommu *iommu = platform_get_drvdata(pdev);
@@ -1234,11 +1222,11 @@ MODULE_DEVICE_TABLE(of, rk_iommu_dt_ids);
 
 static struct platform_driver rk_iommu_driver = {
 	.probe = rk_iommu_probe,
-	.remove = rk_iommu_remove,
 	.shutdown = rk_iommu_shutdown,
 	.driver = {
 		   .name = "rk_iommu",
 		   .of_match_table = rk_iommu_dt_ids,
+		   .suppress_bind_attrs = true,
 	},
 };
 
@@ -1266,14 +1254,7 @@ static int __init rk_iommu_init(void)
 		platform_driver_unregister(&rk_iommu_domain_driver);
 	return ret;
 }
-static void __exit rk_iommu_exit(void)
-{
-	platform_driver_unregister(&rk_iommu_driver);
-	platform_driver_unregister(&rk_iommu_domain_driver);
-}
-
 subsys_initcall(rk_iommu_init);
-module_exit(rk_iommu_exit);
 
 MODULE_DESCRIPTION("IOMMU API for Rockchip");
 MODULE_AUTHOR("Simon Xue <xxm@rock-chips.com> and Daniel Kurtz <djkurtz@chromium.org>");