[PATCH 5.0 217/238] media: imx-csi: Input connections to CSI should be optional

[Greg Kroah-Hartman]

5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Steve Longerbeam <slongerbeam@xxxxxxxxx>

commit 337e90ed028643c7acdfd0d31e3224d05ca03d66 upstream.

Some imx platforms do not have fwnode connections to all CSI input
ports, and should not be treated as an error. This includes the
imx6q SabreAuto, which has no connections to ipu1_csi1 and ipu2_csi0.
Return -ENOTCONN in imx_csi_parse_endpoint() so that v4l2-fwnode
endpoint parsing will not treat an unconnected CSI input port as
an error.

Fixes: c893500a16baf ("media: imx: csi: Register a subdev notifier")

Signed-off-by: Steve Longerbeam <slongerbeam@xxxxxxxxx>
Reviewed-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Acked-by: Tim Harvey <tharvey@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Tested-by: Fabio Estevam <festevam@xxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/staging/media/imx/imx-media-csi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -1787,7 +1787,7 @@ static int imx_csi_parse_endpoint(struct
 				  struct v4l2_fwnode_endpoint *vep,
 				  struct v4l2_async_subdev *asd)
 {
-	return fwnode_device_is_available(asd->match.fwnode) ? 0 : -EINVAL;
+	return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
 }
 
 static int imx_csi_async_register(struct csi_priv *priv)