[PATCH v4 12/17] media: imx7: 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>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
---
Changes in v3:
- call a local imx-media utility imx_media_create_fwnode_pad_link().
Changes in v2:
- Rename notifier_to_dev() to imx7_csi_notifier_to_dev() and remove
  unnecessary inline. Suggested by Rui Silva.
---
 drivers/staging/media/imx/imx7-media-csi.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
index 776eb42ae5c8..88e21c13e420 100644
--- a/drivers/staging/media/imx/imx7-media-csi.c
+++ b/drivers/staging/media/imx/imx7-media-csi.c
@@ -196,6 +196,12 @@ struct imx7_csi {
 	struct completion last_eof_completion;
 };
 
+static struct imx7_csi *
+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);
@@ -1180,6 +1186,20 @@ static const struct v4l2_subdev_internal_ops imx7_csi_internal_ops = {
 	.unregistered	= imx7_csi_unregistered,
 };
 
+static int imx7_csi_notify_bound(struct v4l2_async_notifier *notifier,
+				 struct v4l2_subdev *sd,
+				 struct v4l2_async_subdev *asd)
+{
+	struct imx7_csi *csi = imx7_csi_notifier_to_dev(notifier);
+	struct media_pad *sink = &csi->sd.entity.pads[IMX7_CSI_PAD_SINK];
+
+	return imx_media_create_fwnode_pad_link(sd, sink);
+}
+
+static const struct v4l2_async_notifier_operations imx7_csi_notify_ops = {
+	.bound = imx7_csi_notify_bound,
+};
+
 static int imx7_csi_async_register(struct imx7_csi *csi)
 {
 	struct v4l2_async_subdev *asd = NULL;
@@ -1210,6 +1230,8 @@ static int imx7_csi_async_register(struct imx7_csi *csi)
 		}
 	}
 
+	csi->notifier.ops = &imx7_csi_notify_ops;
+
 	ret = v4l2_async_subdev_notifier_register(&csi->sd, &csi->notifier);
 	if (ret)
 		return ret;
-- 
2.17.1