media: v4l2-subdev: add stubs for v4l2_subdev_get_try_*

In case of missing CONFIG_VIDEO_V4L2_SUBDEV_API those helpers aren't
available. So each driver have to add ifdefs around those helpers or
add the CONFIG_VIDEO_V4L2_SUBDEV_API as dependcy.

Make these helpers available in case of CONFIG_VIDEO_V4L2_SUBDEV_API
isn't set to avoid ifdefs. This approach is less error prone too.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
The patch was previously part of series [1]. Since I want to get
series [1] merged in 5.2 I split this possible stopper out of the
serie and prepared a own series for it. I applied Jacopos comments and
switched to Lubomir's approach [2]. During discussion on series [2]
Sakari pointed out Hans approach [3] which didn't got into the kernel
due to Mauro's concerns. So I think this would be the smalles common
dennominator.

[1] https://patchwork.kernel.org/cover/10786553/
[2] https://patchwork.kernel.org/patch/10703029/
[3] https://patchwork.linuxtv.org/patch/53370/

1 files changed, 28 insertions, 1 deletions

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 349e1c18cf48e..5ced5980d352f 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -971,7 +971,34 @@ static inline struct v4l2_rect
 		pad = 0;
 	return &cfg[pad].try_compose;
 }
-#endif
+
+#else /* !defined(CONFIG_VIDEO_V4L2_SUBDEV_API) */
+
+static inline struct v4l2_mbus_framefmt
+*v4l2_subdev_get_try_format(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_pad_config *cfg,
+			    unsigned int pad)
+{
+	return ERR_PTR(-ENOTTY);
+}
+
+static inline struct v4l2_rect
+*v4l2_subdev_get_try_crop(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+			  unsigned int pad)
+{
+	return ERR_PTR(-ENOTTY);
+}
+
+static inline struct v4l2_rect
+*v4l2_subdev_get_try_compose(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_pad_config *cfg,
+			     unsigned int pad)
+{
+	return ERR_PTR(-ENOTTY);
+}
+
+#endif /* defined(CONFIG_VIDEO_V4L2_SUBDEV_API) */
 
 extern const struct v4l2_file_operations v4l2_subdev_fops;