[PATCH v3 0/2] media: i2c: Add imx283 camera sensor driver

[Umang Jain]

Add a v4l2 subdevice driver for the Sony IMX283 image sensor.
  
The IMX283 is a 20MP Diagonal 15.86 mm (Type 1) CMOS Image Sensor with
Square Pixel for Color Cameras.
    
The following features are supported:
- Manual exposure an gain control support
- vblank/hblank/link freq control support
- Test pattern support control
- Arbitrary horizontal and vertical cropping
- Supported resolution:
   - 5472x3648 @ 20fps (SRGGB12)
   - 5472x3648 @ 25fps (SRGGB10)
   - 2736x1824 @ 50fps (SRGGB12)

The driver is tested on mainline branch v6.8-rc2 on IMX8MP Debix-SOM-A.
Additional testing has been done on RPi5 with the downstream BSP.

Changes in v3:
- fix headers includes
- Improve #define(s) readability
- Drop __func__ from error logs
- Use HZ_PER_MHZ instead of MEGA
- mdsel* variables should be u8
- Use container_of_const() instead of container_of()
- Use clamp() used of clamp_t variant
- Use streams API imx283_{enable|disable}_streams (**NOTE**)
- Properly fix PM runtime handling
  (pm_ptr(), DEFINE_RUNTIME_DEV_PM_OPS,
   imx283_runtime_suspend, imx283_runtime_resume)
- Fix format modifiers, signed-ness at various places


**NOTE**
There is streams mask issue, as no routes are defined with 1 pad:
For testing, I have the following applied locally:
```
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 4c6198c48dd6..38545d779620 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2115,8 +2115,10 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
        if (pad >= sd->entity.num_pads)
                return -EINVAL;
 
-       if (!streams_mask)
-               return 0;
+       if (!streams_mask) {
+               dev_err(sd->dev, "no streams mask, returning ....\n");
+               //return 0;
+       }
 
        /* Fallback on .s_stream() if .enable_streams() isn't available. */
        if (!sd->ops->pad || !sd->ops->pad->enable_streams)
```

changes in v2 (summary):
- Use u32 wherever possible
- Use MEGA macro instead of self defined MHZ() macro
- Properly refine regs using CCI
- Drop tracking of current mode. Shifted to infer from active state directly.
  (Laurent's review)
- Cont. from above: Pass the struct imx283_mode to functions whereever required.
- Remove unused comments
- Remove custom mutex. Use control handler one instead.
- Drop imx283_reset_colorspace() and inline
- Set colorspace field properly (drop _DEFAULTS)
- Use __maybe_unused for imx283_power_on() and imx283_power_off()
- Store controls  v4l2_ctrl handles for those required, not all.
- Drop imx283_free_controls(). Use v4l2_ctrl_handler_free
- fix reset-gpios handling and add it to DT schema
- fix data-lanes property in DT schema
- fix IMX283 Kconfig
- Remove unused macros
- Alphabetical case consistency

Kieran Bingham (1):
  media: i2c: Add imx283 camera sensor driver

Umang Jain (1):
  media: dt-bindings: media: Add bindings for IMX283

 .../bindings/media/i2c/sony,imx283.yaml       |  107 ++
 MAINTAINERS                                   |    9 +
 drivers/media/i2c/Kconfig                     |   10 +
 drivers/media/i2c/Makefile                    |    1 +
 drivers/media/i2c/imx283.c                    | 1596 +++++++++++++++++
 5 files changed, 1723 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/sony,imx283.yaml
 create mode 100644 drivers/media/i2c/imx283.c

-- 
2.43.0