This patchset converts the imx-media driver and its dependent
subdevs to use subdev notifiers.
There are a couple shortcomings in v4l2-core that prevented
subdev notifiers from working correctly in imx-media:
1. v4l2_async_notifier_fwnode_parse_endpoint() treats a fwnode
endpoint that is not connected to a remote device as an error.
But in the case of the video-mux subdev, this is not an error,
it is OK if some of the mux inputs have no connection. Also,
Documentation/devicetree/bindings/media/video-interfaces.txt explicitly
states that the 'remote-endpoint' property is optional. So the first
patch is a small modification to ignore empty endpoints in
v4l2_async_notifier_fwnode_parse_endpoint() and allow
__v4l2_async_notifier_parse_fwnode_endpoints() to continue to
parse the remaining port endpoints of the device.
2. In the imx-media graph, multiple subdevs will encounter the same
upstream subdev (such as the imx6-mipi-csi2 receiver), and so
v4l2_async_notifier_parse_fwnode_endpoints() will add imx6-mipi-csi2
multiple times. This is treated as an error by
v4l2_async_notifier_register() later.
To get around this problem, add an v4l2_async_notifier_add_subdev()
which first verifies the provided asd does not already exist in the
given notifier asd list or in other registered notifiers. If the asd
exists, the function returns -EEXIST and it's up to the caller to
decide if that is an error (in imx-media case it is never an error).
Patches 2-5 deal with adding that support.
3. Patch 6 adds v4l2_async_register_fwnode_subdev(), which is a
convenience function for parsing a subdev's fwnode port endpoints
for connected remote subdevs, registering a subdev notifier, and
then registering the sub-device itself.
4. Patches 7-14 update the subdev drivers to register a subdev notifier
with endpoint parsing, and the changes to imx-media to support that.
5. Finally, the last 3 patches endeavor to completely remove support for
the notifier->subdevs[] array in platform drivers and v4l2 core. All
platform drivers are modified to make use of
v4l2_async_notifier_add_subdev() and its related convenience functions
to add asd's to the notifier @asd_list, and any allocation or reference
to the notifier->subdevs[] array removed. After that large patch,
notifier->subdevs[] array is stripped from v4l2-async and v4l2-subdev
docs are updated to reflect the new method of adding asd's to notifiers.
Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx>
Patches 07-14 (video-mux and the imx patches) are
Reviewed-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Patches 01-14 are
Tested-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
on i.MX6 with Toshiba TC358743 connected via MIPI CSI-2.
History:
v5:
- see point 5 above.
v4:
- small non-functional code cleanup in video-mux.c.
- strip TODO for comparing custom asd's for equivalence.
- add three more convenience functions: v4l2_async_notifier_add_fwnode_subdev,
v4l2_async_notifier_add_i2c_subdev, v4l2_async_notifier_add_devname_subdev.
- strip support in v4l2_async_register_fwnode_subdev for sub-devices
that register from port nodes.
v3:
- code optimization in asd_equal(), and remove unneeded braces,
suggested by Sakari Ailus.
- add a NULL asd pointer check to v4l2_async_notifier_asd_valid().
- fix an error-out path in v4l2_async_register_fwnode_subdev() that
forgot to put device.
v2:
- don't pass an empty endpoint to the parse_endpoint callback,
v4l2_async_notifier_fwnode_parse_endpoint() now just ignores them
and returns success.
- Fix a couple compile warnings and errors seen in i386 and sh archs.
Steve Longerbeam (17):
media: v4l2-fwnode: ignore endpoints that have no remote port parent
media: v4l2: async: Allow searching for asd of any type
media: v4l2: async: Add v4l2_async_notifier_add_subdev
media: v4l2: async: Add convenience functions to allocate and add
asd's
media: v4l2-fwnode: Switch to v4l2_async_notifier_add_subdev
media: v4l2-fwnode: Add a convenience function for registering subdevs
with notifiers
media: platform: video-mux: Register a subdev notifier
media: imx: csi: Register a subdev notifier
media: imx: mipi csi-2: Register a subdev notifier
media: staging/imx: of: Remove recursive graph walk
media: staging/imx: Loop through all registered subdevs for media
links
media: staging/imx: Rename root notifier
media: staging/imx: Switch to v4l2_async_notifier_add_*_subdev
media: staging/imx: TODO: Remove one assumption about OF graph parsing
media: platform: Switch to v4l2_async_notifier_add_subdev
media: v4l2: async: Remove notifier subdevs array
[media] v4l2-subdev.rst: Update doc regarding subdev descriptors
Documentation/media/kapi/v4l2-subdev.rst | 28 ++-
drivers/media/pci/intel/ipu3/ipu3-cio2.c | 10 +-
drivers/media/platform/am437x/am437x-vpfe.c | 80 ++++---
drivers/media/platform/atmel/atmel-isc.c | 13 +-
drivers/media/platform/atmel/atmel-isi.c | 15 +-
drivers/media/platform/cadence/cdns-csi2rx.c | 26 +-
drivers/media/platform/davinci/vpif_capture.c | 47 ++--
drivers/media/platform/davinci/vpif_display.c | 23 +-
drivers/media/platform/exynos4-is/media-dev.c | 30 ++-
drivers/media/platform/exynos4-is/media-dev.h | 1 -
drivers/media/platform/pxa_camera.c | 23 +-
drivers/media/platform/qcom/camss-8x16/camss.c | 74 +++---
drivers/media/platform/qcom/camss-8x16/camss.h | 2 +-
drivers/media/platform/rcar-vin/rcar-csi2.c | 20 +-
drivers/media/platform/rcar_drif.c | 18 +-
drivers/media/platform/renesas-ceu.c | 51 ++--
drivers/media/platform/soc_camera/soc_camera.c | 31 ++-
drivers/media/platform/stm32/stm32-dcmi.c | 22 +-
drivers/media/platform/ti-vpe/cal.c | 34 ++-
drivers/media/platform/video-mux.c | 36 ++-
drivers/media/platform/xilinx/xilinx-vipp.c | 154 ++++++------
drivers/media/platform/xilinx/xilinx-vipp.h | 4 -
drivers/media/v4l2-core/v4l2-async.c | 276 +++++++++++++++++-----
drivers/media/v4l2-core/v4l2-fwnode.c | 194 +++++++--------
drivers/staging/media/imx/TODO | 29 +--
drivers/staging/media/imx/imx-media-csi.c | 55 ++++-
drivers/staging/media/imx/imx-media-dev.c | 143 +++--------
drivers/staging/media/imx/imx-media-internal-sd.c | 5 +-
drivers/staging/media/imx/imx-media-of.c | 106 +--------
drivers/staging/media/imx/imx-media.h | 6 +-
drivers/staging/media/imx/imx6-mipi-csi2.c | 31 ++-
include/media/v4l2-async.h | 90 ++++++-
include/media/v4l2-fwnode.h | 58 ++++-
33 files changed, 966 insertions(+), 769 deletions(-)
--
2.7.4
