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| author | Hans Verkuil <hansverk@cisco.com> | 2018-06-29 13:31:20 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2018-07-25 14:05:06 +0200 |
| commit | 8601494e0ec0a7697230b2abca25d786b793341b (patch) | |
| tree | 389bd2c017615646593c021746f2a704b9ab096d /Documentation/media | |
| parent | media: media-ioc-enum-links.rst: improve pad index description (diff) | |
| download | linux-8601494e0ec0a7697230b2abca25d786b793341b.tar.xz linux-8601494e0ec0a7697230b2abca25d786b793341b.zip | |
media: media-ioc-enum-entities.rst/-g-topology.rst: clarify ID/name usage
Mention that IDs should not be hardcoded in applications and that the
entity name must be unique within the media topology.
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'Documentation/media')
| -rw-r--r-- | Documentation/media/uapi/mediactl/media-ioc-enum-entities.rst | 9 | ||||
| -rw-r--r-- | Documentation/media/uapi/mediactl/media-ioc-g-topology.rst | 19 |
2 files changed, 20 insertions, 8 deletions
diff --git a/Documentation/media/uapi/mediactl/media-ioc-enum-entities.rst b/Documentation/media/uapi/mediactl/media-ioc-enum-entities.rst index 961466ae821d..fc2e39c070c9 100644 --- a/Documentation/media/uapi/mediactl/media-ioc-enum-entities.rst +++ b/Documentation/media/uapi/mediactl/media-ioc-enum-entities.rst @@ -62,15 +62,18 @@ id's until they get an error. - ``id`` - - - - Entity id, set by the application. When the id is or'ed with + - Entity ID, set by the application. When the ID is or'ed with ``MEDIA_ENT_ID_FLAG_NEXT``, the driver clears the flag and returns - the first entity with a larger id. + the first entity with a larger ID. Do not expect that the ID will + always be the same for each instance of the device. In other words, + do not hardcode entity IDs in an application. * - char - ``name``\ [32] - - - - Entity name as an UTF-8 NULL-terminated string. + - Entity name as an UTF-8 NULL-terminated string. This name must be unique + within the media topology. * - __u32 - ``type`` diff --git a/Documentation/media/uapi/mediactl/media-ioc-g-topology.rst b/Documentation/media/uapi/mediactl/media-ioc-g-topology.rst index d6f41a8e307f..bac128c7eda9 100644 --- a/Documentation/media/uapi/mediactl/media-ioc-g-topology.rst +++ b/Documentation/media/uapi/mediactl/media-ioc-g-topology.rst @@ -131,11 +131,14 @@ desired arrays with the media graph elements. * - __u32 - ``id`` - - Unique ID for the entity. + - Unique ID for the entity. Do not expect that the ID will + always be the same for each instance of the device. In other words, + do not hardcode entity IDs in an application. * - char - ``name``\ [64] - - Entity name as an UTF-8 NULL-terminated string. + - Entity name as an UTF-8 NULL-terminated string. This name must be unique + within the media topology. * - __u32 - ``function`` @@ -166,7 +169,9 @@ desired arrays with the media graph elements. * - __u32 - ``id`` - - Unique ID for the interface. + - Unique ID for the interface. Do not expect that the ID will + always be the same for each instance of the device. In other words, + do not hardcode interface IDs in an application. * - __u32 - ``intf_type`` @@ -215,7 +220,9 @@ desired arrays with the media graph elements. * - __u32 - ``id`` - - Unique ID for the pad. + - Unique ID for the pad. Do not expect that the ID will + always be the same for each instance of the device. In other words, + do not hardcode pad IDs in an application. * - __u32 - ``entity_id`` @@ -249,7 +256,9 @@ desired arrays with the media graph elements. * - __u32 - ``id`` - - Unique ID for the link. + - Unique ID for the link. Do not expect that the ID will + always be the same for each instance of the device. In other words, + do not hardcode link IDs in an application. * - __u32 - ``source_id`` |