[RESEND PATCH v3 04/17] media: imx: mipi csi-2: Implement get_fwnode_pad op

[Steve Longerbeam]

Implement get_fwnode_pad operation. If the endpoint is owned by the MIPI
CSI-2 receiver, return the endpoint's port number. The MIPI CSI-2 receiver
maps port numbers and pad indexes 1:1.

Signed-off-by: Steve Longerbeam <slongerbeam@xxxxxxxxx>
---
 drivers/staging/media/imx/imx6-mipi-csi2.c | 28 ++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/staging/media/imx/imx6-mipi-csi2.c b/drivers/staging/media/imx/imx6-mipi-csi2.c
index c1d1afeea53a..e27a342751fc 100644
--- a/drivers/staging/media/imx/imx6-mipi-csi2.c
+++ b/drivers/staging/media/imx/imx6-mipi-csi2.c
@@ -507,9 +507,37 @@ static int csi2_registered(struct v4l2_subdev *sd)
 				      640, 480, 0, V4L2_FIELD_NONE, NULL);
 }
 
+static int csi2_get_fwnode_pad(struct media_entity *entity,
+			       struct fwnode_endpoint *endpoint)
+{
+	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+	struct csi2_dev *csi2 = sd_to_dev(sd);
+	struct fwnode_handle *csi2_ep;
+
+	/*
+	 * If the endpoint is one of ours, return the endpoint's port
+	 * number. This device maps port numbers and pad indexes 1:1.
+	 */
+	fwnode_graph_for_each_endpoint(dev_fwnode(csi2->dev), csi2_ep) {
+		if (endpoint->local_fwnode == csi2_ep) {
+			struct fwnode_endpoint fwep;
+			int ret;
+
+			ret = fwnode_graph_parse_endpoint(csi2_ep, &fwep);
+
+			fwnode_handle_put(csi2_ep);
+
+			return ret ? ret : fwep.port;
+		}
+	}
+
+	return -ENXIO;
+}
+
 static const struct media_entity_operations csi2_entity_ops = {
 	.link_setup = csi2_link_setup,
 	.link_validate = v4l2_subdev_link_validate,
+	.get_fwnode_pad = csi2_get_fwnode_pad,
 };
 
 static const struct v4l2_subdev_video_ops csi2_video_ops = {
-- 
2.17.1