[PATCH v7 26/27] v4l: subdev: add V4L2_SUBDEV_FL_MULTIPLEXED

[Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>]

Add V4L2_SUBDEV_FL_MULTIPLEXED, which indicates that the subdev supports
routing and per-stream configuration. These drivers do not need the old
pad based configuration, so we can skip the allocation in
v4l2_subdev_alloc_state().

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 3 ++-
 include/media/v4l2-subdev.h           | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 13cffe9d9b89..9138434a7a73 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1199,7 +1199,8 @@ struct v4l2_subdev_state *v4l2_subdev_alloc_state(struct v4l2_subdev *sd)
 		goto err;
 	}
 
-	if (sd->entity.num_pads) {
+	/* Drivers that support streams do not need the legacy pad config */
+	if (!(sd->flags & V4L2_SUBDEV_FL_MULTIPLEXED) && sd->entity.num_pads) {
 		state->pads = kvmalloc_array(sd->entity.num_pads,
 					     sizeof(*state->pads),
 					     GFP_KERNEL | __GFP_ZERO);
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 973db58c2d9b..f448e7447ff5 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -914,6 +914,12 @@ struct v4l2_subdev_internal_ops {
  * should set this flag.
  */
 #define V4L2_SUBDEV_FL_HAS_EVENTS		(1U << 3)
+/*
+ * Set this flag if this subdev supports multiplexed streams. This means
+ * that the driver supports routing and handles the stream parameter in its
+ * v4l2_subdev_pad_ops handlers.
+ */
+#define V4L2_SUBDEV_FL_MULTIPLEXED		(1U << 4)
 
 struct regulator_bulk_data;
 
-- 
2.25.1