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

[Meng Yi]

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 at 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