media: intel-ipu3: allow the media graph to be used even if a subdev fails

Hello,

This series allows the ipu3-cio2 driver to properly expose a subset of the media graph even if some drivers for the pending subdevices fail to probe.

Currently the driver exposes a non-functional graph since the pad links are created and the subdev dev nodes are registered in the v4l2 async .complete callback. Instead, these operations should be done in the .bound callback.

Patch #1 just adds a v4l2_device_register_subdev_node() function to allow registering a single device node for a subdev of a v4l2 device.

Patch #2 moves the logic of the ipu3-cio2 .complete callback to the .bound callback. The .complete callback is just removed since is empy after that.

Best regards,
Javier

Javier Martinez Canillas (2):
[media] v4l: allow to register dev nodes for individual v4l2 subdevs
media: intel-ipu3: create pad links and register subdev nodes at bound
time

 drivers/media/pci/intel/ipu3/ipu3-cio2.c | 66 ++++++-----------
 drivers/media/v4l2-core/v4l2-device.c    | 90 ++++++++++++++----------
 include/media/v4l2-device.h              | 10 +++
 3 files changed, 85 insertions(+), 81 deletions(-)

2.17.1