Merge tag 'tags/media-next-imx-20240419' of...

Merge tag 'tags/media-next-imx-20240419' of git://git.kernel.org/pub/scm/linux/kernel/git/pinchartl/linux.git into media_stage

NXP media drivers improvements.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.linuxtv.org/project/linux-media/patch/20240419103822.GA6868@pendragon.ideasonboard.com/

Documentation/devicetree/bindings/media/nxp,imx8-isi.yaml

@@ -84,6 +84,7 @@ allOf:
           properties:
             port@0:
               description: MIPI CSI-2 RX
+            port@1: false
           required:
             - port@0
 

drivers/media/platform/nxp/imx-mipi-csis.c

@@ -30,6 +30,7 @@
 
 #include <media/v4l2-common.h>
 #include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
 #include <media/v4l2-fwnode.h>
 #include <media/v4l2-mc.h>
 #include <media/v4l2-subdev.h>
@@ -742,6 +743,18 @@ static void mipi_csis_stop_stream(struct mipi_csis_device *csis)
 	mipi_csis_system_enable(csis, false);
 }
 
+static void mipi_csis_queue_event_sof(struct mipi_csis_device *csis)
+{
+	struct v4l2_event event = {
+		.type = V4L2_EVENT_FRAME_SYNC,
+	};
+	u32 frame;
+
+	frame = mipi_csis_read(csis, MIPI_CSIS_FRAME_COUNTER_CH(0));
+	event.u.frame_sync.frame_sequence = frame;
+	v4l2_event_queue(csis->sd.devnode, &event);
+}
+
 static irqreturn_t mipi_csis_irq_handler(int irq, void *dev_id)
 {
 	struct mipi_csis_device *csis = dev_id;
@@ -765,6 +778,10 @@ static irqreturn_t mipi_csis_irq_handler(int irq, void *dev_id)
 				event->counter++;
 		}
 	}
+
+	if (status & MIPI_CSIS_INT_SRC_FRAME_START)
+		mipi_csis_queue_event_sof(csis);
+
 	spin_unlock_irqrestore(&csis->slock, flags);
 
 	mipi_csis_write(csis, MIPI_CSIS_INT_SRC, status);
@@ -1154,8 +1171,23 @@ static int mipi_csis_log_status(struct v4l2_subdev *sd)
 	return 0;
 }
 
+static int mipi_csis_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
+				     struct v4l2_event_subscription *sub)
+{
+	if (sub->type != V4L2_EVENT_FRAME_SYNC)
+		return -EINVAL;
+
+	/* V4L2_EVENT_FRAME_SYNC doesn't require an id, so zero should be set */
+	if (sub->id != 0)
+		return -EINVAL;
+
+	return v4l2_event_subscribe(fh, sub, 0, NULL);
+}
+
 static const struct v4l2_subdev_core_ops mipi_csis_core_ops = {
 	.log_status	= mipi_csis_log_status,
+	.subscribe_event =  mipi_csis_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
 };
 
 static const struct v4l2_subdev_video_ops mipi_csis_video_ops = {
@@ -1358,7 +1390,7 @@ static int mipi_csis_subdev_init(struct mipi_csis_device *csis)
 	snprintf(sd->name, sizeof(sd->name), "csis-%s",
 		 dev_name(csis->dev));
 
-	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
 	sd->ctrl_handler = NULL;
 
 	sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;