[PATCH v2 15/23] media: imx: mipi csi-2: Create media links in bound notifier

[Steve Longerbeam <slongerbeam@gmail.com>]

Implement a notifier bound op to register media links from the remote
sub-device's source pad(s) to the mipi csi-2 receiver sink pad.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/staging/media/imx/imx6-mipi-csi2.c | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/staging/media/imx/imx6-mipi-csi2.c b/drivers/staging/media/imx/imx6-mipi-csi2.c
index 06ed4057b426..19275a310033 100644
--- a/drivers/staging/media/imx/imx6-mipi-csi2.c
+++ b/drivers/staging/media/imx/imx6-mipi-csi2.c
@@ -91,6 +91,11 @@ static inline struct csi2_dev *sd_to_dev(struct v4l2_subdev *sdev)
 	return container_of(sdev, struct csi2_dev, sd);
 }
 
+static inline struct csi2_dev *notifier_to_dev(struct v4l2_async_notifier *n)
+{
+	return container_of(n, struct csi2_dev, notifier);
+}
+
 /*
  * The required sequence of MIPI CSI-2 startup as specified in the i.MX6
  * reference manual is as follows:
@@ -556,6 +561,23 @@ static int csi2_parse_endpoint(struct device *dev,
 	return 0;
 }
 
+static int csi2_notify_bound(struct v4l2_async_notifier *notifier,
+			     struct v4l2_subdev *sd,
+			     struct v4l2_async_subdev *asd)
+{
+	struct csi2_dev *csi2 = notifier_to_dev(notifier);
+	struct media_pad *sink = &csi2->sd.entity.pads[CSI2_SINK_PAD];
+
+	return media_create_fwnode_pad_links(sink,
+					     dev_fwnode(csi2->dev),
+					     &sd->entity,
+					     dev_fwnode(sd->dev), 0);
+}
+
+static const struct v4l2_async_notifier_operations csi2_notify_ops = {
+	.bound = csi2_notify_bound,
+};
+
 static int csi2_probe(struct platform_device *pdev)
 {
 	unsigned int sink_port = 0;
@@ -639,6 +661,8 @@ static int csi2_probe(struct platform_device *pdev)
 
 	v4l2_async_notifier_init(&csi2->notifier);
 
+	csi2->notifier.ops = &csi2_notify_ops;
+
 	ret = v4l2_async_register_fwnode_subdev(
 		&csi2->sd, &csi2->notifier, sizeof(struct v4l2_async_subdev),
 		&sink_port, 1, csi2_parse_endpoint);
-- 
2.17.1