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media: Documentation: mc: Add media_device_{init,cleanup}

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Document that drivers must first initialise a media device before
registering it, and clean up once the media device is unregistered.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Sakari Ailus 2022-03-09 18:10:06 +01:00 committed by Mauro Carvalho Chehab
parent e74e476834
commit 1d1d8669e5
1 changed files with 10 additions and 3 deletions
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13
Documentation/driver-api/media/mc-core.rst
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@ -42,9 +42,16 @@ Allocation of the structure is handled by the media device driver, usually by
embedding the :c:type:`media_device` instance in a larger driver-specific
structure.
Drivers register media device instances by calling
:c:func:`__media_device_register()` via the macro ``media_device_register()``
and unregistered by calling :c:func:`media_device_unregister()`.
Drivers initialise media device instances by calling
:c:func:`media_device_init()`. After initialising a media device instance, it is
registered by calling :c:func:`__media_device_register()` via the macro
``media_device_register()`` and unregistered by calling
:c:func:`media_device_unregister()`. An initialised media device must be
eventually cleaned up by calling :c:func:`media_device_cleanup()`.
Note that it is not allowed to unregister a media device instance that was not
previously registered, or clean up a media device instance that was not
previously initialised.
Entities
^^^^^^^^