OMAPDSS: add omap_dss_find_output_by_node()

Add a support function to find a DSS output by given DT node. This is
used in later patches to link the panels to DSS outputs.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/output.c

@@ -128,6 +128,19 @@ struct omap_dss_output *omap_dss_find_output(const char *name)
 }
 EXPORT_SYMBOL(omap_dss_find_output);
 
+struct omap_dss_output *omap_dss_find_output_by_node(struct device_node *node)
+{
+	struct omap_dss_output *out;
+
+	list_for_each_entry(out, &output_list, list) {
+		if (out->pdev->dev.of_node == node)
+			return out;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(omap_dss_find_output_by_node);
+
 static const struct dss_mgr_ops *dss_mgr_ops;
 
 int dss_install_mgr_ops(const struct dss_mgr_ops *mgr_ops)

include/video/omapdss.h

@@ -781,6 +781,7 @@ struct omap_overlay *omap_dss_get_overlay(int num);
 
 struct omap_dss_output *omap_dss_get_output(enum omap_dss_output_id id);
 struct omap_dss_output *omap_dss_find_output(const char *name);
+struct omap_dss_output *omap_dss_find_output_by_node(struct device_node *node);
 int omapdss_output_set_device(struct omap_dss_output *out,
 		struct omap_dss_device *dssdev);
 int omapdss_output_unset_device(struct omap_dss_output *out);