linux-kernel - [PATCH] media: vidioc-queryctrl.rst: clarify combining READ_ONLY with WRITE

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Message-Id: <20190925150945.27706-1-helen.koike@collabora.com>
Date:   Wed, 25 Sep 2019 12:09:45 -0300
From:   Helen Koike <helen.koike@...labora.com>
To:     hverkuil-cisco@...all.nl, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Cc:     Helen Koike <helen.koike@...labora.com>
Subject: [PATCH] media: vidioc-queryctrl.rst: clarify combining READ_ONLY with WRITE_ONLY

Make it clear in the documentation that V4L2_CTRL_FLAG_READ_ONLY doesn't
conflict with V4L2_CTRL_FLAG_WRITE_ONLY. Also make it clear that
if both are combined then the control has read and write permissions.

Signed-off-by: Helen Koike <helen.koike@...labora.com>

---
Hi,

v4l2-compliance expects both flags for read and write permissions, so I
would like to make it clear in the docs.
Please let me know if this is not the case.

Thanks
Helen
---
 Documentation/media/uapi/v4l/vidioc-queryctrl.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/media/uapi/v4l/vidioc-queryctrl.rst b/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
index a3d56ffbf4cc..1d3aecdf679f 100644
--- a/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
+++ b/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
@@ -500,6 +500,11 @@ See also the examples in :ref:`control`.
       - 0x0004
       - This control is permanently readable only. Any attempt to change
 	the control will result in an ``EINVAL`` error code.
+
+	.. note::
+
+	   If combined with ``V4L2_CTRL_FLAG_WRITE_ONLY``, then both, read
+	   and write are allowed.
     * - ``V4L2_CTRL_FLAG_UPDATE``
       - 0x0008
       - A hint that changing this control may affect the value of other
@@ -523,6 +528,11 @@ See also the examples in :ref:`control`.
 	where writing a value will cause the device to carry out a given
 	action (e. g. motor control) but no meaningful value can be
 	returned.
+
+	.. note::
+
+	   If combined with ``V4L2_CTRL_FLAG_READ_ONLY``, then both, read
+	   and write are allowed.
     * - ``V4L2_CTRL_FLAG_VOLATILE``
       - 0x0080
       - This control is volatile, which means that the value of the
-- 
2.22.0