Make an ancillary device between the streaming subdevice and the GPIO
subdevice.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_entity.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_entity.c b/drivers/media/usb/uvc/uvc_entity.c
index c1b69f9eaa56..dad77b96fe16 100644
--- a/drivers/media/usb/uvc/uvc_entity.c
+++ b/drivers/media/usb/uvc/uvc_entity.c
@@ -53,6 +53,16 @@ static int uvc_mc_create_links(struct uvc_video_chain *chain,
 			return ret;
 	}
 
+	/* Create ancillary link for the GPIO. */
+	if (chain->dev->gpio_unit && UVC_ENTITY_TYPE(entity) == UVC_ITT_CAMERA) {
+		struct media_link *link;
+
+		link = media_create_ancillary_link(sink,
+					&chain->dev->gpio_unit->subdev.entity);
+		if (IS_ERR(link))
+			return PTR_ERR(link);
+	}
+
 	return 0;
 }
 

-- 
2.47.0.163.g1226f6d8fa-goog