[media] soc-camera: make .clock_{start,stop} compulsory, .add / .remove optional

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@gmx.de>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

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 3cc086036070..24393a14aaf6 100644
--- a/drivers/media/platform/soc_camera/soc_camera.c
+++ b/drivers/media/platform/soc_camera/soc_camera.c
@@ -512,23 +512,22 @@ 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;
 }
 
@@ -539,9 +538,9 @@ 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;
 }
 
@@ -1383,8 +1382,8 @@ 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;