[PATCH 15/22] media: imx7-media-csi: 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 CSI sink pad.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/staging/media/imx/imx7-media-csi.c | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
index a1c96c52a606..f71ac485f780 100644
--- a/drivers/staging/media/imx/imx7-media-csi.c
+++ b/drivers/staging/media/imx/imx7-media-csi.c
@@ -196,6 +196,11 @@ struct imx7_csi {
 	struct completion last_eof_completion;
 };
 
+static inline struct imx7_csi *notifier_to_dev(struct v4l2_async_notifier *n)
+{
+	return container_of(n, struct imx7_csi, notifier);
+}
+
 static u32 imx7_csi_reg_read(struct imx7_csi *csi, unsigned int offset)
 {
 	return readl(csi->regbase + offset);
@@ -1173,6 +1178,23 @@ static int imx7_csi_parse_endpoint(struct device *dev,
 	return fwnode_device_is_available(asd->match.fwnode) ? 0 : -EINVAL;
 }
 
+static int imx7_csi_notify_bound(struct v4l2_async_notifier *notifier,
+				 struct v4l2_subdev *sd,
+				 struct v4l2_async_subdev *asd)
+{
+	struct imx7_csi *csi = notifier_to_dev(notifier);
+	struct media_pad *sink = &csi->sd.entity.pads[IMX7_CSI_PAD_SINK];
+
+	return media_create_fwnode_pad_links(sink,
+					     dev_fwnode(csi->sd.dev),
+					     &sd->entity,
+					     dev_fwnode(sd->dev), 0);
+}
+
+static const struct v4l2_async_notifier_operations imx7_csi_notify_ops = {
+	.bound = imx7_csi_notify_bound,
+};
+
 static int imx7_csi_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -1253,6 +1275,8 @@ static int imx7_csi_probe(struct platform_device *pdev)
 
 	v4l2_async_notifier_init(&csi->notifier);
 
+	csi->notifier.ops = &imx7_csi_notify_ops;
+
 	ret = v4l2_async_register_fwnode_subdev(&csi->sd, &csi->notifier,
 						sizeof(struct v4l2_async_subdev),
 						NULL, 0,
-- 
2.17.1