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Subject[RESEND PATCH v3 03/17] media: imx: csi: Implement get_fwnode_pad op
Date
The CSI does not have a 1:1 relationship between fwnode port numbers and
pad indexes. In fact the CSI fwnode device is itself a port which is the
sink, containing only a single fwnode endpoint. Implement media_entity
operation get_fwnode_pad to first verify the given endpoint is the CSI's
sink endpoint, and if so return the CSI sink pad index.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
drivers/staging/media/imx/imx-media-csi.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index b60ed4f22f6d..dc5fe25fe7b8 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -1825,9 +1825,32 @@ static void csi_unregistered(struct v4l2_subdev *sd)
ipu_csi_put(priv->csi);
}

+/*
+ * The CSI has only one fwnode endpoint, at the sink pad. Verify the
+ * endpoint belongs to us, and return CSI_SINK_PAD.
+ */
+static int csi_get_fwnode_pad(struct media_entity *entity,
+ struct fwnode_endpoint *endpoint)
+{
+ struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+ struct csi_priv *priv = v4l2_get_subdevdata(sd);
+ struct fwnode_handle *csi_port = dev_fwnode(priv->dev);
+ struct fwnode_handle *csi_ep;
+ int ret;
+
+ csi_ep = fwnode_get_next_child_node(csi_port, NULL);
+
+ ret = endpoint->local_fwnode == csi_ep ? CSI_SINK_PAD : -ENXIO;
+
+ fwnode_handle_put(csi_ep);
+
+ return ret;
+}
+
static const struct media_entity_operations csi_entity_ops = {
.link_setup = csi_link_setup,
.link_validate = v4l2_subdev_link_validate,
+ .get_fwnode_pad = csi_get_fwnode_pad,
};

static const struct v4l2_subdev_core_ops csi_core_ops = {
--
2.17.1
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