linux-kernel - [RFC PATCH 1/3] media: v4l2-subdev.h: Add min and max enum

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Message-Id: <20200414200151.80089-2-daniel@qtec.com>
Date:   Tue, 14 Apr 2020 22:01:49 +0200
From:   Daniel Gomez <daniel@...c.com>
To:     mchehab@...nel.org, hverkuil-cisco@...all.nl,
        linux-media@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Daniel Gomez <daniel@...c.com>
Subject: [RFC PATCH 1/3] media: v4l2-subdev.h: Add min and max enum

Add min and max structures to the v4l2-subdev callback in order to allow
the subdev to return a range of valid frame intervals.

This would operate similar to the struct v4l2_subdev_frame_size_enum and
its max and min values for the width and the height. In this case, the
possibility to return a frame interval range is added to the v4l2-subdev level
whenever the v4l2 device operates in step-wise or continuous mode.

Signed-off-by: Daniel Gomez <daniel@...c.com>
---
 include/uapi/linux/v4l2-subdev.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/v4l2-subdev.h b/include/uapi/linux/v4l2-subdev.h
index 03970ce30741..ee15393c58cd 100644
--- a/include/uapi/linux/v4l2-subdev.h
+++ b/include/uapi/linux/v4l2-subdev.h
@@ -117,6 +117,8 @@ struct v4l2_subdev_frame_interval {
  * @code: format code (MEDIA_BUS_FMT_ definitions)
  * @width: frame width in pixels
  * @height: frame height in pixels
+ * @min_interval: min frame interval in seconds
+ * @max_interval: max frame interval in seconds
  * @interval: frame interval in seconds
  * @which: format type (from enum v4l2_subdev_format_whence)
  */
@@ -126,9 +128,11 @@ struct v4l2_subdev_frame_interval_enum {
 	__u32 code;
 	__u32 width;
 	__u32 height;
+	struct v4l2_fract min_interval;
+	struct v4l2_fract max_interval;
 	struct v4l2_fract interval;
 	__u32 which;
-	__u32 reserved[8];
+	__u32 reserved[4];
 };
 
 /**
-- 
2.25.1