[PATCH v2 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 in V2:
-no change
---
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

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 b23cc58..b1a2490 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
@@ -189,6 +189,7 @@ 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;
 
@@ -200,8 +201,21 @@ static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev,
 		ret = fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 		if (ret)
 			return ret;
+		return 0;
 	}
 
+	bridge = of_drm_find_bridge(np);
+	of_node_put(np);
+	if (!bridge)
+		return -ENODEV;
+
+	fsl_dev->encoder.bridge = bridge;
+	bridge->encoder = &fsl_dev->encoder;
+
+	ret = drm_bridge_attach(fsl_dev->drm, bridge);
+	if (ret)
+		return -EPROBE_DEFER;
+
 	return 0;
 }
 
-- 
2.1.0.27.g96db324