[PATCH v4 2/2] drm/fsl-dcu: add support for drm bridge

[Meng Yi <meng.yi@nxp.com>]

The current output code only supports connection to drm panels.
Add code to support drm bridge, to support connections to
external connectors.

Signed-off-by: Meng Yi <meng.yi@nxp.com>
---
Changes since V1:
-no change
---
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
index ef34436..56f6991 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
@@ -180,17 +180,27 @@ err_cleanup:
 static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev,
 				    const struct of_endpoint *ep)
 {
+	struct drm_bridge *bridge;
 	struct device_node *np;
 	int ret;
 
 	np = of_graph_get_remote_port_parent(ep->local_node);
 
 	fsl_dev->connector.panel = of_drm_find_panel(np);
-	of_node_put(np);
-	if (fsl_dev->connector.panel)
+	if (fsl_dev->connector.panel) {
+		of_node_put(np);
 		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
+	}
+
+	bridge = of_drm_find_bridge(np);
+	of_node_put(np);
+	if (!bridge)
+		return -ENODEV;
+
+	fsl_dev->encoder.bridge = bridge;
+	bridge->encoder = &fsl_dev->encoder;
 
-	return -ENODEV;
+	return drm_bridge_attach(fsl_dev->drm, bridge);
 }
 
 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
-- 
2.1.0.27.g96db324

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