drm/gud: use new debugfs device-centered functions

Replace the use of drm_debugfs_create_files() with the new
drm_debugfs_add_file() function, which center the debugfs files
management on the drm_device instead of drm_minor. Moreover, remove the
debugfs_init hook and add the debugfs files directly on gud_probe(),
before drm_dev_register().
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20221226155029.244355-3-mcanal@igalia.com

drivers/gpu/drm/gud/gud_drv.c

@@ -325,8 +325,8 @@ static struct drm_gem_object *gud_gem_prime_import(struct drm_device *drm, struc
 
 static int gud_stats_debugfs(struct seq_file *m, void *data)
 {
-	struct drm_info_node *node = m->private;
-	struct gud_device *gdrm = to_gud_device(node->minor->dev);
+	struct drm_debugfs_entry *entry = m->private;
+	struct gud_device *gdrm = to_gud_device(entry->dev);
 	char buf[10];
 
 	string_get_size(gdrm->bulk_len, 1, STRING_UNITS_2, buf, sizeof(buf));
@@ -352,16 +352,6 @@ static int gud_stats_debugfs(struct seq_file *m, void *data)
 	return 0;
 }
 
-static const struct drm_info_list gud_debugfs_list[] = {
-	{ "stats", gud_stats_debugfs, 0, NULL },
-};
-
-static void gud_debugfs_init(struct drm_minor *minor)
-{
-	drm_debugfs_create_files(gud_debugfs_list, ARRAY_SIZE(gud_debugfs_list),
-				 minor->debugfs_root, minor);
-}
-
 static const struct drm_simple_display_pipe_funcs gud_pipe_funcs = {
 	.check      = gud_pipe_check,
 	.update	    = gud_pipe_update,
@@ -386,7 +376,6 @@ static const struct drm_driver gud_drm_driver = {
 	.fops			= &gud_fops,
 	DRM_GEM_SHMEM_DRIVER_OPS,
 	.gem_prime_import	= gud_gem_prime_import,
-	.debugfs_init		= gud_debugfs_init,
 
 	.name			= "gud",
 	.desc			= "Generic USB Display",
@@ -623,6 +612,8 @@ static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	if (!gdrm->dmadev)
 		dev_warn(dev, "buffer sharing not supported");
 
+	drm_debugfs_add_file(drm, "stats", gud_stats_debugfs, NULL);
+
 	ret = drm_dev_register(drm, 0);
 	if (ret) {
 		put_device(gdrm->dmadev);