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@linux.intel.com> Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
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@ -776,7 +776,11 @@ struct v4l2_subdev_internal_ops {
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#define V4L2_SUBDEV_FL_IS_SPI (1U << 1)
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/* Set this flag if this subdev needs a device node. */
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#define V4L2_SUBDEV_FL_HAS_DEVNODE (1U << 2)
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/* Set this flag if this subdev generates events. */
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/*
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* Set this flag if this subdev generates events.
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* Note controls can send events, thus drivers exposing controls
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* should set this flag.
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*/
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#define V4L2_SUBDEV_FL_HAS_EVENTS (1U << 3)
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struct regulator_bulk_data;
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