[PATCH v9 12/20] soc-camera: make .clock_{start,stop} compulsory, .add / .remove optional

[Guennadi Liakhovetski <g.liakhovetski@xxxxxx>]

All existing soc-camera host drivers use .clock_start() and .clock_stop()
callbacks to activate and deactivate their camera interfaces, whereas
.add() and .remove() callbacks are usually dummy. Make the former two
compulsory and the latter two optional.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
---
 drivers/media/platform/soc_camera/soc_camera.c |   27 +++++++++++------------
 1 files changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
index 2f81af5..507f539 100644
--- a/drivers/media/platform/soc_camera/soc_camera.c
+++ b/drivers/media/platform/soc_camera/soc_camera.c
@@ -513,23 +513,22 @@ static int soc_camera_add_device(struct soc_camera_device *icd)
 	if (ici->icd)
 		return -EBUSY;
 
-	if (ici->ops->clock_start) {
-		ret = ici->ops->clock_start(ici);
+	ret = ici->ops->clock_start(ici);
+	if (ret < 0)
+		return ret;
+
+	if (ici->ops->add) {
+		ret = ici->ops->add(icd);
 		if (ret < 0)
-			return ret;
+			goto eadd;
 	}
 
-	ret = ici->ops->add(icd);
-	if (ret < 0)
-		goto eadd;
-
 	ici->icd = icd;
 
 	return 0;
 
 eadd:
-	if (ici->ops->clock_stop)
-		ici->ops->clock_stop(ici);
+	ici->ops->clock_stop(ici);
 	return ret;
 }
 
@@ -540,9 +539,9 @@ static void soc_camera_remove_device(struct soc_camera_device *icd)
 	if (WARN_ON(icd != ici->icd))
 		return;
 
-	ici->ops->remove(icd);
-	if (ici->ops->clock_stop)
-		ici->ops->clock_stop(ici);
+	if (ici->ops->remove)
+		ici->ops->remove(icd);
+	ici->ops->clock_stop(ici);
 	ici->icd = NULL;
 }
 
@@ -1413,8 +1412,8 @@ int soc_camera_host_register(struct soc_camera_host *ici)
 	    ((!ici->ops->init_videobuf ||
 	      !ici->ops->reqbufs) &&
 	     !ici->ops->init_videobuf2) ||
-	    !ici->ops->add ||
-	    !ici->ops->remove ||
+	    !ici->ops->clock_start ||
+	    !ici->ops->clock_stop ||
 	    !ici->ops->poll ||
 	    !ici->v4l2_dev.dev)
 		return -EINVAL;
-- 
1.7.2.5

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