Hello,

this series adds support for the Himax HM1246 image sensor.
The Himax HM1246-AWD is a 1/3.7-Inch CMOS image sensor SoC with an active
array size of 1296 x 976.
Currently, only the native RAW mode is supported. Other modes and the
internal image signal processing pipeline are not currently supported.
The data sheet is available on the manufacturer's website [1].
Tested on i.MX8MP hardware. A Toshiba TC358746 bridge was used to convert
the sensor's parallel video output into MIPI signals for the i.MX8MP.

Best regards
 ~Matthias
 
[1] https://www.himax.com.tw/wp-content/uploads/2024/03/HM1246-AWD_DS_v01.pdf

v4l2-compliance 1.28.1, 64 bits, 64-bit time_t

Compliance test for device /dev/v4l-subdev4:

Driver Info:
        Driver version   : 6.12.0
        Capabilities     : 0x00000000
        Client Capabilities: 0x0000000000000003
streams interval-uses-which
Required ioctls:
        test VIDIOC_SUDBEV_QUERYCAP: OK
        test invalid ioctls: OK

Allow for multiple opens:
        test second /dev/v4l-subdev4 open: OK
        test VIDIOC_SUBDEV_QUERYCAP: OK
        test for unlimited opens: OK

Debug ioctls:
        test VIDIOC_LOG_STATUS: OK (Not Supported)

Input ioctls:
        test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported)
        test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
        test VIDIOC_S_HW_FREQ_SEEK: OK (Not Supported)
        test VIDIOC_ENUMAUDIO: OK (Not Supported)
        test VIDIOC_G/S/ENUMINPUT: OK (Not Supported)
        test VIDIOC_G/S_AUDIO: OK (Not Supported)
        Inputs: 0 Audio Inputs: 0 Tuners: 0

Output ioctls:
        test VIDIOC_G/S_MODULATOR: OK (Not Supported)
        test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
        test VIDIOC_ENUMAUDOUT: OK (Not Supported)
        test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported)
        test VIDIOC_G/S_AUDOUT: OK (Not Supported)
        Outputs: 0 Audio Outputs: 0 Modulators: 0

Input/Output configuration ioctls:
        test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported)
        test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported)
        test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported)
        test VIDIOC_G/S_EDID: OK (Not Supported)

Control ioctls:
        test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK
        test VIDIOC_QUERYCTRL: OK
        test VIDIOC_G/S_CTRL: OK
        test VIDIOC_G/S/TRY_EXT_CTRLS: OK
        test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OK
        test VIDIOC_G/S_JPEGCOMP: OK (Not Supported)
        Standard Controls: 15 Private Controls: 0

Format ioctls:
        test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OK (Not Supported)
        test VIDIOC_G/S_PARM: OK (Not Supported)
        test VIDIOC_G_FBUF: OK (Not Supported)
        test VIDIOC_G_FMT: OK (Not Supported)
        test VIDIOC_TRY_FMT: OK (Not Supported)
        test VIDIOC_S_FMT: OK (Not Supported)
        test VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported)
        test Cropping: OK (Not Supported)
        test Composing: OK (Not Supported)
        test Scaling: OK (Not Supported)

Codec ioctls:
        test VIDIOC_(TRY_)ENCODER_CMD: OK (Not Supported)
        test VIDIOC_G_ENC_INDEX: OK (Not Supported)
        test VIDIOC_(TRY_)DECODER_CMD: OK (Not Supported)

Buffer ioctls:
        test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: OK (Not Supported)
        test CREATE_BUFS maximum buffers: OK
        test VIDIOC_REMOVE_BUFS: OK
        test VIDIOC_EXPBUF: OK (Not Supported)
        test Requests: OK (Not Supported)

Total for device /dev/v4l-subdev4: 45, Succeeded: 45, Failed: 0, Warnings: 0

Signed-off-by: Matthias Fend <matthias.fend@emfend.at>
---
Changes in v8:
- Adjusted copyright year (Sakari)
- Use local var for unreferenced v4l2 controls (Sakari)
- Return NULL instead of PTR_ERR if hm1246_find_mode_by_mbus_code() fails (Sakari)
- Removed unnecessary parentheses (Sakari)
- Dropped git reference in MAINTAINER entry (Sakari)
- Added default for bus-width in bindings (Sakari)
- Link to v7: https://lore.kernel.org/r/20260112-hm1246-v7-0-fee8587f2808@emfend.at (local)

Changes in v7:
- Expect the PLL to generate the exact link frequency specified in DT (Laurent, Sakari)
- Dropped {g,s}_register functions
- Link to v6: https://lore.kernel.org/r/20251202-hm1246-v6-0-3e96ed6b3ffa@emfend.at (local)

Changes in v6:
- Rework includes to follow include-what-you-use (Andy)
- Replace 'fsleep(6000)' with 'fsleep(6 * USEC_PER_MSEC)' (Andy)
- Simplify hm1246_get_selection() return (Andy)
- Use explicit indexes for test pattern array (Andy)
- Improve some line-wrappings (Andy)
- Avoid using __maybe_unused (Andy)
- Drop an unnecessary type cast (Andy)
- Use '0' instead of '0x0' (Andy)
- Reword comments about timings (Andy)
- Simplify error handling of hm1246_init_controls() (Sakari)
- Revert 'rework PLL calc to use goto' (Andy, Sakari)
- Link to v5: https://lore.kernel.org/r/20251104-hm1246-v5-0-97c8f25b5419@emfend.at (local)

Changes in v5:
- Converted to lower case hexadecimals
- Use consistent returns in switch of hm1246_get_selection()
- Adjust some variable types/attributes
- Removed redundant parentheses
- Rework PLL calc to use goto
- Simplified some function returns
- Use array definition for test patterns
- Source format adjustments
- Properly init minimum of pixel_rate control
- dropped hm1246_update_controls()
- require and check DT link frequencies
- Link to v4: https://lore.kernel.org/r/20251017-hm1246-v4-0-e3388ea2f08c@emfend.at (local)

Changes in v4:
- Split changes to MAINTAINERS into commits
- Fix comma after statement (use semicolon)
- Replace abs() with abs_diff() in PLL calculation
- Inverse needs_cmu_update logic
- Drop mode from hm1246_set_ctrl()
- Return if xclk frequency is out of range
- Fix reset_gpio dev_err_probe()
- Rebased on media-committers/next
- Link to v3: https://lore.kernel.org/r/20250912-hm1246-v3-0-3b89f47dfa43@emfend.at (local)

Changes in v3:
- Bindings: Remove bus-type and add default polarity values
- Select V4L2_CCI_I2C
- Convert additional macros to use HZ_PER_*
- Replace cur_mode with v4l2_find_nearest_size()
- Remove duplicates in the register init sequence
- Use container_of_const
- Check return of hm1246_update_controls()
- Correct multi-line comments
- Replace hm1246_cci_write_cmu()
- Consistently use hm1246->dev
- Use pm_runtime_put_autosuspend()
- Remove v4l2 event handling
- Convert to devm_v4l2_sensor_clk_get()
- Configure PM before registering subdev
- Link to v2: https://lore.kernel.org/r/20250526-hm1246-v2-0-6b882827a3a5@emfend.at (local)
- Depends-on: https://lore.kernel.org/all/20250707143253.167910-1-mehdi.djait@linux.intel.com/ (local)

Changes in v2:
- Use macros for 64-bit division
- Avoid compiler warnings about potentially uninitialized variables
- Fix two uses of dev_err_probe
- Link to v1: https://lore.kernel.org/r/20250403-hm1246-v1-0-30990d71bc42@emfend.at (local)

---
Matthias Fend (2):
      media: dt-bindings: i2c: add Himax HM1246 image sensor
      media: i2c: add Himax HM1246 image sensor driver

 .../bindings/media/i2c/himax,hm1246.yaml           |  120 ++
 MAINTAINERS                                        |    7 +
 drivers/media/i2c/Kconfig                          |   10 +
 drivers/media/i2c/Makefile                         |    1 +
 drivers/media/i2c/hm1246.c                         | 1298 ++++++++++++++++++++
 5 files changed, 1436 insertions(+)
---
base-commit: 3aa9296a23ec41a8424e9a2346eea59fb6cb7d8c
change-id: 20250403-hm1246-96b0cdab773c

Best regards,
-- 
Matthias Fend [off-list ref]