Hello, This patch series adds a driver for the onsemi AR0144 camera sensor. The AR0144 is a 1/4" 1MP 12-bit raw camera sensor, with monochrome and Bayer variants. It has both parallel and MIPI CSI-2 output capability. Its features include analog crop, binning/skipping and the usual set of controls applicable to raw sensors. It has a CCS-compatible clock tree, but doesn't use the CCS register layout. In addition to the standard features, the sensor supports automatic exposure and black level correction. Furthermore, it supports dynamic range compression to reduce the bit rate. This last feature is new to V4L2, and is why this series is marked as RFC. Patch 1/9 adds the DT binding, and patch 2/9 the driver. Support for the parallel interface comes in patch 3/9. I haven't bundled it with 2/9 as my test platform supports CSI-2 only, so I couldn't test the parallel interface, and I suspect it will not work out of the box. I'm fine leaving 3/9 out for now, it will be available in the list archives should anyone decide to test and complete support for the parallel output. Patches 4/9 to 7/9 then add support for internal pads, routing and embedded data. This is split from patch 3/9 as the necessary APIs are not merged in the kernel yet. The DT binding and the base driver could be upstreamed first and independently from embedded data support, depending on the timing of the dependencies. Patch 8/9 then starts the RFC part. It adds a new V4L2 control for companding. Companding is a combination of compressing (on the camera sensor side) and expanding the data to reduce the bandwidth transmitted on the bus. The AR0144 support compressing data using a custom curve similar to A-law when outputting 8- or 10-bit data. This improves the sensitivity in the middle of the dynamic range. The new control allows enabling compression. The control doesn't affect the bit depth of the output format, only the way the larger bit depth of the sensor is reduced. Finally, patch 9/9 implement the companding control in the ar0144 driver. The series is based on "[PATCH v9 00/46] Generic line based metadata support, internal pads" ([1]). I have pushed it to a branch ([2]) that includes the dependencies (along with other relevant - and less relevant - bits and pieces such as DT overlays for testing). [1] https://lore.kernel.org/all/20240416193319.778192-1-sakari.ailus@xxxxxxxxxxxxxxx/ [2] https://git.kernel.org/pub/scm/linux/kernel/git/pinchartl/linux.git/log/?h=nxp/v6.11/dev/rpi-cam/next Laurent Pinchart (9): media: dt-bindings: media: i2c: Add AR0144 camera sensor media: i2c: Add a driver for the onsemi AR0144 camera sensor media: i2c: ar0144: Add support for the parallel interface media: i2c: ar0144: Add internal image sink pad media: i2c: ar0144: Add image stream media: i2c: ar0144: Report internal routes to userspace media: i2c: ar0144: Add embedded data support media: v4l: ctrls: Add a control for companding media: i2c: ar0144: Add support for companding .../bindings/media/i2c/onnn,ar0144.yaml | 162 ++ .../media/v4l/ext-ctrls-image-process.rst | 16 + MAINTAINERS | 7 + drivers/media/i2c/Kconfig | 11 + drivers/media/i2c/Makefile | 1 + drivers/media/i2c/ar0144.c | 2111 +++++++++++++++++ drivers/media/v4l2-core/v4l2-ctrls-defs.c | 9 + include/uapi/linux/v4l2-controls.h | 5 + 8 files changed, 2322 insertions(+) create mode 100644 Documentation/devicetree/bindings/media/i2c/onnn,ar0144.yaml create mode 100644 drivers/media/i2c/ar0144.c base-commit: 39574b6b7bf1368c42975263988d86cc400526e2 -- Regards, Laurent Pinchart
