1 files changed, 22 insertions, 1 deletions

diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index 68488a7ad0d6..fc684615a135 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -603,6 +603,7 @@ int dprc_setup(struct fsl_mc_device *mc_dev)
 	struct irq_domain *mc_msi_domain;
 	bool mc_io_created = false;
 	bool msi_domain_set = false;
+	bool root_dprc = false;
 	u16 major_ver, minor_ver;
 	size_t region_size;
 	int error;
@@ -635,6 +636,11 @@ int dprc_setup(struct fsl_mc_device *mc_dev)
 			return error;
 
 		mc_io_created = true;
+	} else {
+		if (dev_is_fsl_mc(parent_dev))
+			return -EINVAL;
+
+		root_dprc = true;
 	}
 
 	mc_msi_domain = fsl_mc_find_msi_domain(&mc_dev->dev);
@@ -646,11 +652,19 @@ int dprc_setup(struct fsl_mc_device *mc_dev)
 		msi_domain_set = true;
 	}
 
+	if (root_dprc) {
+		error = fsl_mc_uapi_create_device_file(mc_bus);
+		if (error < 0) {
+			error = -EPROBE_DEFER;
+			goto error_cleanup_msi_domain;
+		}
+	}
+
 	error = dprc_open(mc_dev->mc_io, 0, mc_dev->obj_desc.id,
 			  &mc_dev->mc_handle);
 	if (error < 0) {
 		dev_err(&mc_dev->dev, "dprc_open() failed: %d\n", error);
-		goto error_cleanup_msi_domain;
+		goto error_cleanup_uapi;
 	}
 
 	error = dprc_get_attributes(mc_dev->mc_io, 0, mc_dev->mc_handle,
@@ -683,6 +697,10 @@ int dprc_setup(struct fsl_mc_device *mc_dev)
 error_cleanup_open:
 	(void)dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle);
 
+error_cleanup_uapi:
+	if (fsl_mc_is_root_dprc(&mc_dev->dev))
+		fsl_mc_uapi_remove_device_file(mc_bus);
+
 error_cleanup_msi_domain:
 	if (msi_domain_set)
 		dev_set_msi_domain(&mc_dev->dev, NULL);
@@ -763,6 +781,7 @@ static void dprc_teardown_irq(struct fsl_mc_device *mc_dev)
 
 int dprc_cleanup(struct fsl_mc_device *mc_dev)
 {
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
 	int error;
 
 	/* this function should be called only for DPRCs, it
@@ -793,6 +812,8 @@ int dprc_cleanup(struct fsl_mc_device *mc_dev)
 	if (!fsl_mc_is_root_dprc(&mc_dev->dev)) {
 		fsl_destroy_mc_io(mc_dev->mc_io);
 		mc_dev->mc_io = NULL;
+	} else {
+		fsl_mc_uapi_remove_device_file(mc_bus);
 	}
 
 	return 0;