drm/imx: imx-ldb: use of_graph_get_endpoint_by_regs helper

Instead of using of_graph_get_port_by_id() to get the port and then
of_get_child_by_name() to get the first endpoint, get to the endpoint
in a single step.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index f506e8d..5f8f0bf 100644 (file)
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -558,7 +558,7 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
        for_each_child_of_node(np, child) {
                struct imx_ldb_channel *channel;
                struct device_node *ddc_node;
-               struct device_node *port;
+               struct device_node *ep;
 
                ret = of_property_read_u32(child, "reg", &i);
                if (ret || i < 0 || i > 1)
@@ -581,22 +581,23 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
                 * The output port is port@4 with an external 4-port mux or
                 * port@2 with the internal 2-port mux.
                 */
-               port = of_graph_get_port_by_id(child, imx_ldb->lvds_mux ? 4 : 2);
-               if (port) {
-                       struct device_node *endpoint, *remote;
-
-                       endpoint = of_get_child_by_name(port, "endpoint");
-                       if (endpoint) {
-                               remote = of_graph_get_remote_port_parent(endpoint);
-                               if (remote)
-                                       channel->panel = of_drm_find_panel(remote);
-                               else
-                                       return -EPROBE_DEFER;
-                               if (!channel->panel) {
-                                       dev_err(dev, "panel not found: %s\n",
-                                               remote->full_name);
-                                       return -EPROBE_DEFER;
-                               }
+               ep = of_graph_get_endpoint_by_regs(child,
+                                                  imx_ldb->lvds_mux ? 4 : 2,
+                                                  -1);
+               if (ep) {
+                       struct device_node *remote;
+
+                       remote = of_graph_get_remote_port_parent(ep);
+                       of_node_put(ep);
+                       if (remote)
+                               channel->panel = of_drm_find_panel(remote);
+                       else
+                               return -EPROBE_DEFER;
+                       of_node_put(remote);
+                       if (!channel->panel) {
+                               dev_err(dev, "panel not found: %s\n",
+                                       remote->full_name);
+                               return -EPROBE_DEFER;
                        }
                }