linux-kernel - [PATCH] media: v4l2-subdev: document controls need _FL_HAS

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Message-Id: <20181205165537.21502-1-luca@lucaceresoli.net>
Date:   Wed,  5 Dec 2018 17:55:37 +0100
From:   Luca Ceresoli <luca@...aceresoli.net>
To:     linux-media@...r.kernel.org
Cc:     Luca Ceresoli <luca@...aceresoli.net>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] media: v4l2-subdev: document controls need _FL_HAS_DEVNODE

Control events can be subscribed and received by the user. Therefore
drivers that support controls must expose the
V4L2_SUBDEV_FL_HAS_EVENTS flag.

[As discussed in https://lkml.org/lkml/2018/11/27/637]
Reported-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>
---
 include/media/v4l2-subdev.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 9102d6ca566e..47af609dc8f1 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -776,7 +776,11 @@ struct v4l2_subdev_internal_ops {
 #define V4L2_SUBDEV_FL_IS_SPI			(1U << 1)
 /* Set this flag if this subdev needs a device node. */
 #define V4L2_SUBDEV_FL_HAS_DEVNODE		(1U << 2)
-/* Set this flag if this subdev generates events. */
+/*
+ * Set this flag if this subdev generates events.
+ * Note controls can send events, thus drivers exposing controls
+ * should set this flag.
+ */
 #define V4L2_SUBDEV_FL_HAS_EVENTS		(1U << 3)
 
 struct regulator_bulk_data;
-- 
2.17.1