Hello everyone, I've been recently working (with others) on sub-device streams support as well as on internal pads. The two can be used to make sub-device configuration more versatile. At the same time, the added interfaces are much more useful if we require specific semantics of those interfaces, so that the user space knows exactly what e.g. a given selection target signifies. However, as the same selection rectangle could be used for a different purpose on a non-raw sensor device, we need a way to tell how should the user space determine how to use a given interface. I'm proposing to solve this problem by introducing sub-device configuration models, and by the common raw sensor model, also present in this patchset, in particular. This has been (and will, for some time, continue to be) the reason why I have reviewed few sensor driver related patches lately. As we're introducing a new interface, it's beneficial to be able to use that interface right from the start, rather than trying to later on offer compatibility support, which is almost always a fair amount of work with less than desirable results in the driver. With this solved, I believe we can enable the use of the streams UAPI. Comments are welcome. RFC v3 is <20241129095142.87196-1-sakari.ailus@xxxxxxxxxxxxxxx> on LMML. RFC v2 (labelled as PATCH) is <20241122100633.8971-1-sakari.ailus@xxxxxxxxxxxxxxx> on LMML. RFC v1 is <20241011075535.588140-1-sakari.ailus@xxxxxxxxxxxxxxx> on LMML. We may end up postponing merging three last patches (those adding controls) until current control values are moved to sub-device (and video device) state. Discussion is needed on the topic. The compiled documentation can be found here <URL:https://www.retiisi.eu/~sailus/v4l2/tmp/common-raw/output/userspace-api/media/v4l/dev-subdev.html#media-subdev-config-model-common-raw-sensor>. since RFC v3: - Fix binning control name in documentation. - Note V4L2_CID_CONFIG_MODEL is read-only. - Clarify wording in config model documentation based on Jacopo's comments. - Clarify post-scaler digital crop behaviour. since RFC v2: - Remove the CROP_BOUNDS rectangle on the image data sink pad. It's redundant. - Remove scaling from the sink compose rectangle, leaving binning and sub-sampling. - Introduce scaling as well as post-scaler digital crop on source pad (image stream). This is a new patch, preceding control changes. - Use monospace font for selection targets. - Improvements in referring to previous configuration steps in text description. since RFC v1: - Rework the documentation according to the comments (spelling fixes, alignment mostly). - Include separate patches for binning and sub-sampling controls. - Allow binning, scaling and scaling to be configured using the compose rectangle. This will change to just scaling in the three last patches. Sakari Ailus (9): media: Documentation: Rework embedded data documentation media: Documentation: Add a hyphen to list-based media: Documentation: Reword split of sensor driver to two classes media: Documentation: Add subdev configuration models, raw sensor model media: Documentation: Add scaling and post-scaler crop for common raw media: uapi: Add V4L2_CID_CONFIG_MODEL control media: uapi: Add V4L2_CID_BINNING control for binning configuration media: uapi: Add controls for sub-sampling configuration media: Documentation: Add binning and sub-sampling controls .../media/drivers/camera-sensor.rst | 53 ++- .../media/v4l/common-raw-sensor.dia | 441 ++++++++++++++++++ .../media/v4l/common-raw-sensor.svg | 134 ++++++ .../userspace-api/media/v4l/dev-subdev.rst | 2 + .../media/v4l/ext-ctrls-camera.rst | 40 ++ .../media/v4l/ext-ctrls-image-process.rst | 4 + .../media/v4l/subdev-config-model.rst | 233 +++++++++ drivers/media/v4l2-core/v4l2-ctrls-defs.c | 9 + include/uapi/linux/v4l2-controls.h | 6 + 9 files changed, 908 insertions(+), 14 deletions(-) create mode 100644 Documentation/userspace-api/media/v4l/common-raw-sensor.dia create mode 100644 Documentation/userspace-api/media/v4l/common-raw-sensor.svg create mode 100644 Documentation/userspace-api/media/v4l/subdev-config-model.rst base-commit: 251513d49483c066e43c0bacd5650ffe44728584 -- 2.39.5
