[PATCH 18/22] media: imx: csi: Create media links in bound notifier

[Steve Longerbeam]

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 <slongerb...@gmail.com>
---
 drivers/staging/media/imx/imx-media-csi.c | 24 +++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/staging/media/imx/imx-media-csi.c 
b/drivers/staging/media/imx/imx-media-csi.c
index b39d79e63ac2..37b10cbf3c1a 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -120,6 +120,11 @@ static inline struct csi_priv *sd_to_dev(struct 
v4l2_subdev *sdev)
        return container_of(sdev, struct csi_priv, sd);
 }
 
+static inline struct csi_priv *notifier_to_dev(struct v4l2_async_notifier *n)
+{
+       return container_of(n, struct csi_priv, notifier);
+}
+
 static inline bool is_parallel_bus(struct v4l2_fwnode_endpoint *ep)
 {
        return ep->bus_type != V4L2_MBUS_CSI2_DPHY;
@@ -1895,6 +1900,23 @@ static int imx_csi_parse_endpoint(struct device *dev,
        return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
 }
 
+static int imx_csi_notify_bound(struct v4l2_async_notifier *notifier,
+                               struct v4l2_subdev *sd,
+                               struct v4l2_async_subdev *asd)
+{
+       struct csi_priv *priv = notifier_to_dev(notifier);
+       struct media_pad *sink = &priv->sd.entity.pads[CSI_SINK_PAD];
+
+       return media_create_fwnode_pad_links(sink,
+                                            dev_fwnode(priv->dev->parent),
+                                            &sd->entity,
+                                            dev_fwnode(sd->dev), 0);
+}
+
+static const struct v4l2_async_notifier_operations csi_notify_ops = {
+       .bound = imx_csi_notify_bound,
+};
+
 static int imx_csi_async_register(struct csi_priv *priv)
 {
        struct fwnode_handle *fwnode;
@@ -1903,6 +1925,8 @@ static int imx_csi_async_register(struct csi_priv *priv)
 
        v4l2_async_notifier_init(&priv->notifier);
 
+       priv->notifier.ops = &csi_notify_ops;
+
        fwnode = dev_fwnode(priv->dev);
 
        /* get this CSI's port id */
-- 
2.17.1