OMAP: DSS2: add detect() to omap_dss_driver struct

detect() can be used to probe if the display is connected.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/include/video/omapdss.h b/include/video/omapdss.h
index 33410b4..a927eea 100644
--- a/include/video/omapdss.h
+++ b/include/video/omapdss.h
@@ -624,6 +624,7 @@
 	u32 (*get_wss)(struct omap_dss_device *dssdev);
 
 	int (*read_edid)(struct omap_dss_device *dssdev, u8 *buf, int len);
+	bool (*detect)(struct omap_dss_device *dssdev);
 };
 
 int omap_dss_register_driver(struct omap_dss_driver *);