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[v2,0/5] media: Add MIPI CCI register access helper functions

Message ID 20230614192343.57280-1-hdegoede@redhat.com
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Series media: Add MIPI CCI register access helper functions | expand

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Hans de Goede June 14, 2023, 7:23 p.m. UTC 
Hi Laurent, Sakari, et al.,

Here is v2 of my MIPI CCI register access helper patches.

New in the CCI register access helpers in v2:
- Drop cci_reg_type enum
- Make having an encoded reg-width mandatory rather then using 0 to encode
  8 bit width making reg-addresses without an encoded width default to
  a width of 8
- Add support for 64 bit wide registers
- Introduce a new cci_reg_sequence struct with 64 bit reg values for 64 bit
  support and without the delay_us field
- Various kerneldoc updates
- Stop supporting delays in cci_multi_reg_write()
- Some includes cleanups
- Disable regmap locking

Other changes:
- Add a patch to convert the ov5693 driver (tested on Surface Go)
- Add a patch to convert the imx290 driver (untested)

Original (v1) cover-letter:

The CSI2 specification specifies a standard method to access camera sensor
registers called "Camera Control Interface (CCI)".

Currently a lot of Linux camera sensor drivers all have their own custom
helpers for this, often copy and pasted from other drivers.

This adds a set of generic helpers for this so that all sensor drivers can
switch to a single common implementation.

This is based on / the result of our previous discussion on this here:
Link: https://lore.kernel.org/linux-media/59aefa7f-7bf9-6736-6040-39551329cd0a@redhat.com/

Patches 2-4 are examples of how these helpers can be used and patch 5
removes the now no longer necessary ov_16bit_addr_reg_helpers.h which was
the previous attempt to add common CCI access helpers.

Regards,

Hans


Hans de Goede (5):
  media: Add MIPI CCI register access helper functions
  media: ov5693: Convert to new CCI register access helpers
  media: imx290: Convert to new CCI register access helpers
  media: atomisp: ov2680: Convert to new CCI register access helpers
  media: Remove ov_16bit_addr_reg_helpers.h

 Documentation/driver-api/media/v4l2-cci.rst   |   5 +
 Documentation/driver-api/media/v4l2-core.rst  |   1 +
 drivers/media/i2c/Kconfig                     |   2 +
 drivers/media/i2c/imx290.c                    | 350 +++++------
 drivers/media/i2c/ov5693.c                    | 574 +++++++-----------
 drivers/media/v4l2-core/Kconfig               |   5 +
 drivers/media/v4l2-core/Makefile              |   1 +
 drivers/media/v4l2-core/v4l2-cci.c            | 157 +++++
 drivers/staging/media/atomisp/i2c/Kconfig     |   1 +
 .../media/atomisp/i2c/atomisp-ov2680.c        | 237 +++-----
 drivers/staging/media/atomisp/i2c/ov2680.h    |  86 +--
 include/media/ov_16bit_addr_reg_helpers.h     |  92 ---
 include/media/v4l2-cci.h                      | 121 ++++
 13 files changed, 763 insertions(+), 869 deletions(-)
 create mode 100644 Documentation/driver-api/media/v4l2-cci.rst
 create mode 100644 drivers/media/v4l2-core/v4l2-cci.c
 delete mode 100644 include/media/ov_16bit_addr_reg_helpers.h
 create mode 100644 include/media/v4l2-cci.h