drm: bridge: adv7511: Make connector creation optional

Now that the driver supports all the connector-related bridge
operations, make the connector creation optional. This enables usage of
the adv7511 with the DRM bridge connector helper.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200526011505.31884-5-laurent.pinchart+renesas@ideasonboard.com

drivers/gpu/drm/bridge/adv7511/adv7511_drv.c

@@ -902,16 +902,13 @@ static int adv7511_bridge_attach(struct drm_bridge *bridge,
 				 enum drm_bridge_attach_flags flags)
 {
 	struct adv7511 *adv = bridge_to_adv7511(bridge);
-	int ret;
-
-	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
-		DRM_ERROR("Fix bridge driver to make connector optional!");
-		return -EINVAL;
-	}
+	int ret = 0;
 
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
 		ret = adv7511_connector_init(adv);
 		if (ret < 0)
 			return ret;
+	}
 
 	if (adv->type == ADV7533 || adv->type == ADV7535)
 		ret = adv7533_attach_dsi(adv);