Merge tag 'media/v4.8-4' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

Pull media documentation updates from Mauro Carvalho Chehab:
 "This patch series does the conversion of all media documentation stuff
  to Restrutured Text markup format and add them to the
  Documentation/index.rst file.

  The media documentation was grouped into 4 books:

    - media uAPI
    - media kAPI
    - V4L driver-specific documentation
    - DVB driver-specific documentation

  It also contains several documentation improvements and one fixup
  patch for a core issue with cropcap.

  PS.  After this patch series, the media DocBook is deprecated and
  should be removed.  I'll add such patch on a future pull request"

* tag 'media/v4.8-4' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (322 commits)
  [media] cx23885-cardlist.rst: add a new card
  [media] doc-rst: add some needed escape codes
  [media] doc-rst: kapi: use :c:func: instead of :cpp:func
  doc-rst: kernel-doc: fix a change introduced by mistake
  [media] v4l2-ioctl.h add debug info for struct v4l2_ioctl_ops
  [media] dvb_ringbuffer.h: some documentation improvements
  [media] v4l2-ctrls.h: fully document the header file
  [media] doc-rst: Fix some typedef ugly warnings
  [media] doc-rst: reorganize the kAPI v4l2 chapters
  [media] rename v4l2-framework.rst to v4l2-intro.rst
  [media] move V4L2 clocks to a separate .rst file
  [media] v4l2-fh.rst: add cross references and markups
  [media] v4l2-fh.rst: add fh contents from v4l2-framework.rst
  [media] v4l2-fh.h: add documentation for it
  [media] v4l2-event.rst: add cross-references and markups
  [media] v4l2-event.h: document all functions
  [media] v4l2-event.rst: add text from v4l2-framework.rst
  [media] v4l2-framework.rst: remove videobuf quick chapter
  [media] v4l2-dev: add cross-references and improve markup
  [media] doc-rst: move v4l2-dev doc to a separate file
  ...

6 files changed, 85 insertions, 199 deletions

diff --git a/drivers/media/dvb-core/demux.h b/drivers/media/dvb-core/demux.h
index 7f1dffef4353..4b4c1da20f4b 100644
--- a/drivers/media/dvb-core/demux.h
+++ b/drivers/media/dvb-core/demux.h
@@ -1,6 +1,10 @@
 /*
  * demux.h
  *
+ * The Kernel Digital TV Demux kABI defines a driver-internal interface for
+ * registering low-level, hardware specific driver to a hardware independent
+ * demux layer.
+ *
  * Copyright (c) 2002 Convergence GmbH
  *
  * based on code:
@@ -32,49 +36,6 @@
 #include <linux/time.h>
 #include <linux/dvb/dmx.h>
 
-/**
- * DOC: Digital TV Demux
- *
- * The Kernel Digital TV Demux kABI defines a driver-internal interface for
- * registering low-level, hardware specific driver to a hardware independent
- * demux layer. It is only of interest for Digital TV device driver writers.
- * The header file for this kABI is named demux.h and located in
- * drivers/media/dvb-core.
- *
- * The demux kABI should be implemented for each demux in the system. It is
- * used to select the TS source of a demux and to manage the demux resources.
- * When the demux client allocates a resource via the demux kABI, it receives
- * a pointer to the kABI of that resource.
- *
- * Each demux receives its TS input from a DVB front-end or from memory, as
- * set via this demux kABI. In a system with more than one front-end, the kABI
- * can be used to select one of the DVB front-ends as a TS source for a demux,
- * unless this is fixed in the HW platform.
- *
- * The demux kABI only controls front-ends regarding to their connections with
- * demuxes; the kABI used to set the other front-end parameters, such as
- * tuning, are devined via the Digital TV Frontend kABI.
- *
- * The functions that implement the abstract interface demux should be defined
- * static or module private and registered to the Demux core for external
- * access. It is not necessary to implement every function in the struct
- * &dmx_demux. For example, a demux interface might support Section filtering,
- * but not PES filtering. The kABI client is expected to check the value of any
- * function pointer before calling the function: the value of NULL means
- * that the function is not available.
- *
- * Whenever the functions of the demux API modify shared data, the
- * possibilities of lost update and race condition problems should be
- * addressed, e.g. by protecting parts of code with mutexes.
- *
- * Note that functions called from a bottom half context must not sleep.
- * Even a simple memory allocation without using %GFP_ATOMIC can result in a
- * kernel thread being put to sleep if swapping is needed. For example, the
- * Linux Kernel calls the functions of a network device interface from a
- * bottom half context. Thus, if a demux kABI function is called from network
- * device code, the function must not sleep.
- */
-
 /*
  * Common definitions
  */
@@ -104,7 +65,7 @@
  */
 
 /**
- * enum ts_filter_type - filter type bitmap for dmx_ts_feed.set()
+ * enum ts_filter_type - filter type bitmap for dmx_ts_feed.set\(\)
  *
  * @TS_PACKET:          Send TS packets (188 bytes) to callback (default).
  * @TS_PAYLOAD_ONLY:    In case TS_PACKET is set, only send the TS payload
@@ -231,30 +192,6 @@ struct dmx_section_feed {
 };
 
 /**
- * DOC: Demux Callback
- *
- * This kernel-space API comprises the callback functions that deliver filtered
- * data to the demux client. Unlike the other DVB kABIs, these functions are
- * provided by the client and called from the demux code.
- *
- * The function pointers of this abstract interface are not packed into a
- * structure as in the other demux APIs, because the callback functions are
- * registered and used independent of each other. As an example, it is possible
- * for the API client to provide several callback functions for receiving TS
- * packets and no callbacks for PES packets or sections.
- *
- * The functions that implement the callback API need not be re-entrant: when
- * a demux driver calls one of these functions, the driver is not allowed to
- * call the function again before the original call returns. If a callback is
- * triggered by a hardware interrupt, it is recommended to use the Linux
- * bottom half mechanism or start a tasklet instead of making the callback
- * function call directly from a hardware interrupt.
- *
- * This mechanism is implemented by dmx_ts_cb() and dmx_section_cb()
- * callbacks.
- */
-
-/**
  * typedef dmx_ts_cb - DVB demux TS filter callback function prototype
  *
  * @buffer1:            Pointer to the start of the filtered TS packets.
@@ -402,7 +339,7 @@ struct dmx_frontend {
  * @DMX_SECTION_FILTERING:      set if section filtering is supported;
  * @DMX_MEMORY_BASED_FILTERING: set if write() available.
  *
- * Those flags are OR'ed in the &dmx_demux.&capabilities field
+ * Those flags are OR'ed in the &dmx_demux.capabilities field
  */
 enum dmx_demux_caps {
         DMX_TS_FILTERING = 1,
@@ -442,10 +379,10 @@ enum dmx_demux_caps {
  *      @open is called and decrement it when @close is called.
  *      The @demux function parameter contains a pointer to the demux API and
  *      instance data.
- *      It returns
- *              0 on success;
- *              -EUSERS, if maximum usage count was reached;
- *              -EINVAL, on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -EUSERS, if maximum usage count was reached;
+ *      -EINVAL, on bad parameter.
  *
  * @close: This function reserves the demux for use by the caller and, if
  *      necessary, initializes the demux. When the demux is no longer needed,
@@ -455,10 +392,10 @@ enum dmx_demux_caps {
  *      @open is called and decrement it when @close is called.
  *      The @demux function parameter contains a pointer to the demux API and
  *      instance data.
- *      It returns
- *              0 on success;
- *              -ENODEV, if demux was not in use (e. g. no users);
- *              -EINVAL, on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -ENODEV, if demux was not in use (e. g. no users);
+ *      -EINVAL, on bad parameter.
  *
  * @write: This function provides the demux driver with a memory buffer
  *      containing TS packets. Instead of receiving TS packets from the DVB
@@ -473,12 +410,12 @@ enum dmx_demux_caps {
  *      The @buf function parameter contains a pointer to the TS data in
  *      kernel-space memory.
  *      The @count function parameter contains the length of the TS data.
- *      It returns
- *              0 on success;
- *              -ERESTARTSYS, if mutex lock was interrupted;
- *              -EINTR, if a signal handling is pending;
- *              -ENODEV, if demux was removed;
- *              -EINVAL, on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -ERESTARTSYS, if mutex lock was interrupted;
+ *      -EINTR, if a signal handling is pending;
+ *      -ENODEV, if demux was removed;
+ *      -EINVAL, on bad parameter.
  *
  * @allocate_ts_feed: Allocates a new TS feed, which is used to filter the TS
  *      packets carrying a certain PID. The TS feed normally corresponds to a
@@ -489,11 +426,11 @@ enum dmx_demux_caps {
  *      instance data.
  *      The @callback function parameter contains a pointer to the callback
  *      function for passing received TS packet.
- *      It returns
- *              0 on success;
- *              -ERESTARTSYS, if mutex lock was interrupted;
- *              -EBUSY, if no more TS feeds is available;
- *              -EINVAL, on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -ERESTARTSYS, if mutex lock was interrupted;
+ *      -EBUSY, if no more TS feeds is available;
+ *      -EINVAL, on bad parameter.
  *
  * @release_ts_feed: Releases the resources allocated with @allocate_ts_feed.
  *      Any filtering in progress on the TS feed should be stopped before
@@ -502,9 +439,9 @@ enum dmx_demux_caps {
  *      instance data.
  *      The @feed function parameter contains a pointer to the TS feed API and
  *      instance data.
- *      It returns
- *              0 on success;
- *              -EINVAL on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -EINVAL on bad parameter.
  *
  * @allocate_section_feed: Allocates a new section feed, i.e. a demux resource
  *      for filtering and receiving sections. On platforms with hardware
@@ -520,10 +457,10 @@ enum dmx_demux_caps {
  *      instance data.
  *      The @callback function parameter contains a pointer to the callback
  *      function for passing received TS packet.
- *      It returns
- *              0 on success;
- *              -EBUSY, if no more TS feeds is available;
- *              -EINVAL, on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -EBUSY, if no more TS feeds is available;
+ *      -EINVAL, on bad parameter.
  *
  * @release_section_feed: Releases the resources allocated with
  *      @allocate_section_feed, including allocated filters. Any filtering in
@@ -533,9 +470,9 @@ enum dmx_demux_caps {
  *      instance data.
  *      The @feed function parameter contains a pointer to the TS feed API and
  *      instance data.
- *      It returns
- *              0 on success;
- *              -EINVAL, on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -EINVAL, on bad parameter.
  *
  * @add_frontend: Registers a connectivity between a demux and a front-end,
  *      i.e., indicates that the demux can be connected via a call to
@@ -549,9 +486,9 @@ enum dmx_demux_caps {
  *      instance data.
  *      The @frontend function parameter contains a pointer to the front-end
  *      instance data.
- *      It returns
- *              0 on success;
- *              -EINVAL, on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -EINVAL, on bad parameter.
  *
  * @remove_frontend: Indicates that the given front-end, registered by a call
  *      to @add_frontend, can no longer be connected as a TS source by this
@@ -565,10 +502,10 @@ enum dmx_demux_caps {
  *      instance data.
  *      The @frontend function parameter contains a pointer to the front-end
  *      instance data.
- *      It returns
- *              0 on success;
- *              -ENODEV, if the front-end was not found,
- *              -EINVAL, on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -ENODEV, if the front-end was not found,
+ *      -EINVAL, on bad parameter.
  *
  * @get_frontends: Provides the APIs of the front-ends that have been
  *      registered for this demux. Any of the front-ends obtained with this
@@ -592,17 +529,17 @@ enum dmx_demux_caps {
  *      instance data.
  *      The @frontend function parameter contains a pointer to the front-end
  *      instance data.
- *      It returns
- *              0 on success;
- *              -EINVAL, on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -EINVAL, on bad parameter.
  *
  * @disconnect_frontend: Disconnects the demux and a front-end previously
  *      connected by a @connect_frontend call.
  *      The @demux function parameter contains a pointer to the demux API and
  *      instance data.
- *      It returns
- *              0 on success;
- *              -EINVAL on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -EINVAL on bad parameter.
  *
  * @get_pes_pids: Get the PIDs for DMX_PES_AUDIO0, DMX_PES_VIDEO0,
  *      DMX_PES_TELETEXT0, DMX_PES_SUBTITLE0 and DMX_PES_PCR0.
@@ -610,9 +547,9 @@ enum dmx_demux_caps {
  *      instance data.
  *      The @pids function parameter contains an array with five u16 elements
  *      where the PIDs will be stored.
- *      It returns
- *              0 on success;
- *              -EINVAL on bad parameter.
+ *      It returns:
+ *      0 on success;
+ *      -EINVAL on bad parameter.
  */
 
 struct dmx_demux {
diff --git a/drivers/media/dvb-core/dvb_frontend.h b/drivers/media/dvb-core/dvb_frontend.h
index 9592573a0b41..fb6e84811504 100644
--- a/drivers/media/dvb-core/dvb_frontend.h
+++ b/drivers/media/dvb-core/dvb_frontend.h
@@ -1,6 +1,10 @@
 /*
  * dvb_frontend.h
  *
+ * The Digital TV Frontend kABI defines a driver-internal interface for
+ * registering low-level, hardware specific driver to a hardware independent
+ * frontend layer.
+ *
  * Copyright (C) 2001 convergence integrated media GmbH
  * Copyright (C) 2004 convergence GmbH
  *
@@ -42,29 +46,6 @@
 
 #include "dvbdev.h"
 
-/**
- * DOC: Digital TV Frontend
- *
- * The Digital TV Frontend kABI defines a driver-internal interface for
- * registering low-level, hardware specific driver to a hardware independent
- * frontend layer. It is only of interest for Digital TV device driver writers.
- * The header file for this API is named dvb_frontend.h and located in
- * drivers/media/dvb-core.
- *
- * Before using the Digital TV frontend core, the bridge driver should attach
- * the frontend demod, tuner and SEC devices and call dvb_register_frontend(),
- * in order to register the new frontend at the subsystem. At device
- * detach/removal, the bridge driver should call dvb_unregister_frontend() to
- * remove the frontend from the core and then dvb_frontend_detach() to free the
- * memory allocated by the frontend drivers.
- *
- * The drivers should also call dvb_frontend_suspend() as part of their
- * handler for the &device_driver.suspend(), and dvb_frontend_resume() as
- * part of their handler for &device_driver.resume().
- *
- * A few other optional functions are provided to handle some special cases.
- */
-
 /*
  * Maximum number of Delivery systems per frontend. It
  * should be smaller or equal to 32
@@ -406,7 +387,7 @@ struct dtv_frontend_properties;
  *                      FE_DISHNETWORK_SEND_LEGACY_CMD ioctl (only Satellite).
  *                      Drivers should not use this, except when the DVB
  *                      core emulation fails to provide proper support (e.g.
- *                      if set_voltage() takes more than 8ms to work), and
+ *                      if @set_voltage takes more than 8ms to work), and
  *                      when backward compatibility with this legacy API is
  *                      required.
  * @i2c_gate_ctrl:      controls the I2C gate. Newer drivers should use I2C
@@ -741,13 +722,13 @@ void dvb_frontend_detach(struct dvb_frontend *fe);
  * This function prepares a Digital TV frontend to suspend.
  *
  * In order to prepare the tuner to suspend, if
- * &dvb_frontend_ops.tuner_ops.suspend() is available, it calls it. Otherwise,
- * it will call &dvb_frontend_ops.tuner_ops.sleep(), if available.
+ * &dvb_frontend_ops.tuner_ops.suspend\(\) is available, it calls it. Otherwise,
+ * it will call &dvb_frontend_ops.tuner_ops.sleep\(\), if available.
  *
- * It will also call &dvb_frontend_ops.sleep() to put the demod to suspend.
+ * It will also call &dvb_frontend_ops.sleep\(\) to put the demod to suspend.
  *
- * The drivers should also call dvb_frontend_suspend() as part of their
- * handler for the &device_driver.suspend().
+ * The drivers should also call dvb_frontend_suspend\(\) as part of their
+ * handler for the &device_driver.suspend\(\).
  */
 int dvb_frontend_suspend(struct dvb_frontend *fe);
 
@@ -758,17 +739,17 @@ int dvb_frontend_suspend(struct dvb_frontend *fe);
  *
  * This function resumes the usual operation of the tuner after resume.
  *
- * In order to resume the frontend, it calls the demod &dvb_frontend_ops.init().
+ * In order to resume the frontend, it calls the demod &dvb_frontend_ops.init\(\).
  *
- * If &dvb_frontend_ops.tuner_ops.resume() is available, It, it calls it.
- * Otherwise,t will call &dvb_frontend_ops.tuner_ops.init(), if available.
+ * If &dvb_frontend_ops.tuner_ops.resume\(\) is available, It, it calls it.
+ * Otherwise,t will call &dvb_frontend_ops.tuner_ops.init\(\), if available.
  *
  * Once tuner and demods are resumed, it will enforce that the SEC voltage and
  * tone are restored to their previous values and wake up the frontend's
  * kthread in order to retune the frontend.
  *
  * The drivers should also call dvb_frontend_resume() as part of their
- * handler for the &device_driver.resume().
+ * handler for the &device_driver.resume\(\).
  */
 int dvb_frontend_resume(struct dvb_frontend *fe);
 
@@ -777,7 +758,7 @@ int dvb_frontend_resume(struct dvb_frontend *fe);
  *
  * @fe: pointer to the frontend struct
  *
- * Calls &dvb_frontend_ops.init() and &dvb_frontend_ops.tuner_ops.init(),
+ * Calls &dvb_frontend_ops.init\(\) and &dvb_frontend_ops.tuner_ops.init\(\),
  * and resets SEC tone and voltage (for Satellite systems).
  *
  * NOTE: Currently, this function is used only by one driver (budget-av).
@@ -799,14 +780,14 @@ void dvb_frontend_reinitialise(struct dvb_frontend *fe);
  * satellite subsystem.
  *
  * Its used internally by the DVB frontend core, in order to emulate
- * %FE_DISHNETWORK_SEND_LEGACY_CMD using the &dvb_frontend_ops.set_voltage()
+ * %FE_DISHNETWORK_SEND_LEGACY_CMD using the &dvb_frontend_ops.set_voltage\(\)
  * callback.
  *
  * NOTE: it should not be used at the drivers, as the emulation for the
  * legacy callback is provided by the Kernel. The only situation where this
  * should be at the drivers is when there are some bugs at the hardware that
  * would prevent the core emulation to work. On such cases, the driver would
- * be writing a &dvb_frontend_ops.dishnetwork_send_legacy_command() and
+ * be writing a &dvb_frontend_ops.dishnetwork_send_legacy_command\(\) and
  * calling this function directly.
  */
 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec);
diff --git a/drivers/media/dvb-core/dvb_math.h b/drivers/media/dvb-core/dvb_math.h
index 34dc1df03cab..2f0326674ca6 100644
--- a/drivers/media/dvb-core/dvb_math.h
+++ b/drivers/media/dvb-core/dvb_math.h
@@ -30,11 +30,15 @@
  * @value: The value (must be != 0)
  *
  * to use rational values you can use the following method:
+ *
  *   intlog2(value) = intlog2(value * 2^x) - x * 2^24
  *
  * Some usecase examples:
+ *
  *      intlog2(8) will give 3 << 24 = 3 * 2^24
+ *
  *      intlog2(9) will give 3 << 24 + ... = 3.16... * 2^24
+ *
  *      intlog2(1.5) = intlog2(3) - 2^24 = 0.584... * 2^24
  *
  *
@@ -48,10 +52,13 @@ extern unsigned int intlog2(u32 value);
  * @value: The value (must be != 0)
  *
  * to use rational values you can use the following method:
+ *
  *   intlog10(value) = intlog10(value * 10^x) - x * 2^24
  *
  * An usecase example:
+ *
  *      intlog10(1000) will give 3 << 24 = 3 * 2^24
+ *
  *   due to the implementation intlog10(1000) might be not exactly 3 * 2^24
  *
  * look at intlog2 for similar examples
diff --git a/drivers/media/dvb-core/dvb_ringbuffer.h b/drivers/media/dvb-core/dvb_ringbuffer.h
index 3ebc2d34b4a2..8af642399f1e 100644
--- a/drivers/media/dvb-core/dvb_ringbuffer.h
+++ b/drivers/media/dvb-core/dvb_ringbuffer.h
@@ -150,9 +150,6 @@ extern ssize_t dvb_ringbuffer_pkt_write(struct dvb_ringbuffer *rbuf, u8* buf,
 
 /**
  * dvb_ringbuffer_pkt_read_user - Read from a packet in the ringbuffer.
- * Note: unlike dvb_ringbuffer_read(), this does NOT update the read pointer
- * in the ringbuffer. You must use dvb_ringbuffer_pkt_dispose() to mark a
- * packet as no longer required.
  *
  * @rbuf: Ringbuffer concerned.
  * @idx: Packet index as returned by dvb_ringbuffer_pkt_next().
@@ -161,9 +158,17 @@ extern ssize_t dvb_ringbuffer_pkt_write(struct dvb_ringbuffer *rbuf, u8* buf,
  * @len: Size of destination buffer.
  *
  * returns Number of bytes read, or -EFAULT.
+ *
+ * .. note::
+ *
+ *    unlike dvb_ringbuffer_read(), this does **NOT** update the read pointer
+ *    in the ringbuffer. You must use dvb_ringbuffer_pkt_dispose() to mark a
+ *    packet as no longer required.
  */
-extern ssize_t dvb_ringbuffer_pkt_read_user(struct dvb_ringbuffer *rbuf, size_t idx,
-                                       int offset, u8 __user *buf, size_t len);
+extern ssize_t dvb_ringbuffer_pkt_read_user(struct dvb_ringbuffer *rbuf,
+                                            size_t idx,
+                                            int offset, u8 __user *buf,
+                                            size_t len);
 
 /**
  * dvb_ringbuffer_pkt_read - Read from a packet in the ringbuffer.
diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index 70b559d7ca80..e6da353b39bc 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -812,40 +812,6 @@ static int video_register_media_controller(struct video_device *vdev, int type)
         return 0;
 }
 
-/**
- *      __video_register_device - register video4linux devices
- *      @vdev: video device structure we want to register
- *      @type: type of device to register
- *      @nr:   which device node number (0 == /dev/video0, 1 == /dev/video1, ...
- *             -1 == first free)
- *      @warn_if_nr_in_use: warn if the desired device node number
- *             was already in use and another number was chosen instead.
- *      @owner: module that owns the video device node
- *
- *      The registration code assigns minor numbers and device node numbers
- *      based on the requested type and registers the new device node with
- *      the kernel.
- *
- *      This function assumes that struct video_device was zeroed when it
- *      was allocated and does not contain any stale date.
- *
- *      An error is returned if no free minor or device node number could be
- *      found, or if the registration of the device node failed.
- *
- *      Zero is returned on success.
- *
- *      Valid types are
- *
- *      %VFL_TYPE_GRABBER - A frame grabber
- *
- *      %VFL_TYPE_VBI - Vertical blank data (undecoded)
- *
- *      %VFL_TYPE_RADIO - A radio card
- *
- *      %VFL_TYPE_SUBDEV - A subdevice
- *
- *      %VFL_TYPE_SDR - Software Defined Radio
- */
 int __video_register_device(struct video_device *vdev, int type, int nr,
                 int warn_if_nr_in_use, struct module *owner)
 {
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 953eab08e420..34a1e7c8b306 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -621,16 +621,6 @@ void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 }
 EXPORT_SYMBOL(v4l2_subdev_init);
 
-/**
- * v4l2_subdev_notify_event() - Delivers event notification for subdevice
- * @sd: The subdev for which to deliver the event
- * @ev: The event to deliver
- *
- * Will deliver the specified event to all userspace event listeners which are
- * subscribed to the v42l subdev event queue as well as to the bridge driver
- * using the notify callback. The notification type for the notify callback
- * will be V4L2_DEVICE_NOTIFY_EVENT.
- */
 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
                               const struct v4l2_event *ev)
 {