[PATCH v3 00/23] V4L2 fwnode rework; support for default configuration

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Hello everyone,

I've long thought the V4L2 fwnode framework requires some work (it's buggy
and it does not adequately serve common needs). This set should address in
particular these matters:

- Most devices support a particular media bus type but the V4L2 fwnode
  framework was not able to use such information, but instead tried to
  guess the bus type with varying levels of success while drivers
  generally ignored the results. This patchset makes that possible ---
  setting a bus type enables parsing configuration for only that bus.
  Failing that check results in returning -ENXIO to be returned.

- Support specifying default configuration. If the endpoint has no
  configuration, the defaults set by the driver (as documented in DT
  bindings) will prevail. Any available configuration will still be read
  from the endpoint as one could expect. A common use case for this is
  e.g. the number of CSI-2 lanes. Few devices support lane mapping, and
  default 1:1 mapping is provided in absence of a valid default or
  configuration read OF.

- Debugging information is greatly improved.

- Recognition of the differences between CSI-2 D-PHY and C-PHY. All
  currently supported hardware (or at least drivers) is D-PHY only, so
  this change is still easy.

The smiapp driver is converted to use the new functionality. This patchset
does not address remaining issues such as supporting setting defaults for
e.g. bridge drivers with multiple ports, but with Steve Longerbeam's
patchset we're much closer to that goal. I've rebased this set on top of
Steve's. Albeit the two deal with the same files, there were only a few
trivial conflicts.

Note that I've only tested parsing endpoints for the CSI-2 bus (no
parallel IF hardware). Jacopo has tested an earlier version of the set
with a few changes to the parallel bus handling compared to this one.

Comments are welcome.

I've pushed the patches (including Steve's) here:

<URL:https://git.linuxtv.org/sailus/media_tree.git/log/?h=v4l2-fwnode-next>

since v1:

- Rebase it all on current media tree master --- there was a conflict in
  drivers/media/platform/qcom/camss/camss.c in Steve's patch "media:
  platform: Switch to v4l2_async_notifier_add_subdev"; I hope the
  resolution was fine.

- Default to Bt.656 bus in guessing the bus type if no properties
  suggesting otherwise are set. In v1 and error was returned, which would
  have been troublesome for the existing drivers.

- Set the bus_type field to zero (i.e. guess) for existing callers of
  v4l2_fwnode_endpoint_(alloc_)parse.

- Improved documentation for v4l2_fwnode_endpoint_parse and
  v4l2_fwnode_endpoint_alloc_parse.

since v2:

- Rename V4L2_MBUS_CSI2 to V4L2_MBUS_CSI2_DPHY also in
  drivers/gpu/ipu-v3/ipu-csi.c.

- Use 0 instead of V4L2_MBUS_UNKNOWN in
  v4l2_async_notifier_fwnode_parse_endpoint(). This is partially due to
  V4L2_MBUS_UNKNOWN being introduced after the change is done.

- Initialise bus_type to zero in quite a few V4L2 fwnode endpoints in
  drivers/staging/media/imx/imx-media-csi.c (thanks to Steve for the
  changes).

Sakari Ailus (23):
  v4l: fwnode: Add debug prints for V4L2 endpoint property parsing
  v4l: fwnode: Use fwnode_graph_for_each_endpoint
  v4l: fwnode: The CSI-2 clock is continuous if it's not non-continuous
  dt-bindings: media: Specify bus type for MIPI D-PHY, others,
    explicitly
  v4l: fwnode: Add definitions for CSI-2 D-PHY, parallel and Bt.656
    busses
  v4l: mediabus: Recognise CSI-2 D-PHY and C-PHY
  v4l: fwnode: Let the caller provide V4L2 fwnode endpoint
  v4l: fwnode: Detect bus type correctly
  v4l: fwnode: Make use of newly specified bus types
  v4l: fwnode: Read lane inversion information despite lane numbering
  v4l: fwnode: Only assign configuration if there is no error
  v4l: fwnode: Support driver-defined lane mapping defaults
  v4l: fwnode: Support default CSI-2 lane mapping for drivers
  v4l: fwnode: Parse the graph endpoint as last
  v4l: fwnode: Use default parallel flags
  v4l: fwnode: Initialise the V4L2 fwnode endpoints to zero
  v4l: fwnode: Only zero the struct if bus type is set to
    V4L2_MBUS_UNKNOWN
  v4l: fwnode: Use media bus type for bus parser selection
  v4l: fwnode: Print bus type
  v4l: fwnode: Use V4L2 fwnode endpoint media bus type if set
  v4l: fwnode: Support parsing of CSI-2 C-PHY endpoints
  v4l: fwnode: Update V4L2 fwnode endpoint parsing documentation
  smiapp: Query the V4L2 endpoint for a specific bus type

 .../devicetree/bindings/media/video-interfaces.txt |   4 +-
 drivers/gpu/ipu-v3/ipu-csi.c                       |   6 +-
 drivers/media/i2c/adv7180.c                        |   2 +-
 drivers/media/i2c/adv7604.c                        |   2 +-
 drivers/media/i2c/mt9v032.c                        |   2 +-
 drivers/media/i2c/ov2659.c                         |  14 +-
 drivers/media/i2c/ov5640.c                         |   4 +-
 drivers/media/i2c/ov5645.c                         |   2 +-
 drivers/media/i2c/ov5647.c                         |   2 +-
 drivers/media/i2c/ov7251.c                         |   4 +-
 drivers/media/i2c/ov7670.c                         |   2 +-
 drivers/media/i2c/s5c73m3/s5c73m3-core.c           |   4 +-
 drivers/media/i2c/s5k5baf.c                        |   6 +-
 drivers/media/i2c/s5k6aa.c                         |   2 +-
 drivers/media/i2c/smiapp/smiapp-core.c             |  34 +-
 drivers/media/i2c/soc_camera/ov5642.c              |   2 +-
 drivers/media/i2c/tc358743.c                       |  28 +-
 drivers/media/i2c/tda1997x.c                       |   2 +-
 drivers/media/i2c/tvp514x.c                        |   2 +-
 drivers/media/i2c/tvp5150.c                        |   2 +-
 drivers/media/i2c/tvp7002.c                        |   2 +-
 drivers/media/pci/intel/ipu3/ipu3-cio2.c           |   2 +-
 drivers/media/platform/am437x/am437x-vpfe.c        |   2 +-
 drivers/media/platform/atmel/atmel-isc.c           |   3 +-
 drivers/media/platform/atmel/atmel-isi.c           |   2 +-
 drivers/media/platform/cadence/cdns-csi2rx.c       |   4 +-
 drivers/media/platform/cadence/cdns-csi2tx.c       |   4 +-
 drivers/media/platform/davinci/vpif_capture.c      |   2 +-
 drivers/media/platform/exynos4-is/media-dev.c      |   2 +-
 drivers/media/platform/exynos4-is/mipi-csis.c      |   2 +-
 drivers/media/platform/marvell-ccic/mcam-core.c    |   4 +-
 drivers/media/platform/marvell-ccic/mmp-driver.c   |   2 +-
 drivers/media/platform/omap3isp/isp.c              |   2 +-
 drivers/media/platform/pxa_camera.c                |   4 +-
 drivers/media/platform/rcar-vin/rcar-csi2.c        |   4 +-
 drivers/media/platform/renesas-ceu.c               |   3 +-
 drivers/media/platform/soc_camera/soc_mediabus.c   |   2 +-
 drivers/media/platform/stm32/stm32-dcmi.c          |   4 +-
 drivers/media/platform/ti-vpe/cal.c                |   2 +-
 drivers/media/v4l2-core/v4l2-fwnode.c              | 508 ++++++++++++++++-----
 drivers/staging/media/imx/imx-media-csi.c          |  10 +-
 drivers/staging/media/imx/imx6-mipi-csi2.c         |   2 +-
 drivers/staging/media/imx074/imx074.c              |   2 +-
 include/media/v4l2-fwnode.h                        |  60 ++-
 include/media/v4l2-mediabus.h                      |   8 +-
 45 files changed, 542 insertions(+), 226 deletions(-)

-- 
2.11.0




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