[PATCH v9 0/6] Enable cameras on Dell Latitude 5285 2-in-1

[Thierry Chatard <tchatard@gmail.com>]

This series enables the front (OV5670/INT3479) and rear (OV8858/INT3477)
cameras on the Dell Latitude 5285 2-in-1 under Linux.

Per Documentation/process/coding-assistants.rst: this work was developed
with help from an AI coding assistant (Claude Code, by Anthropic). I used
it to help reverse-engineer the ACPI/TPS68470 bring-up, iterate on the
board data, and draft these patches; I have reviewed and tested all of it
on the hardware and take responsibility for the result.

The series is interdependent (all six patches are needed for working
cameras) and touches three subsystems: mfd (patch 1), platform/x86 int3472
(patches 2-4) and media (patches 5-6). It is probably best merged as one
set - for example via platform-drivers-x86 with an immutable branch that
the media and MFD trees can pull. Lee, an Acked-by on patch 1 (mfd) would
help enable that; I'm happy to follow whichever merge approach the
maintainers prefer.

Changes since v8 (addressing Andy Shevchenko's review):
- Patch 1: correct the subject prefix to "mfd:"; carry Andy's Reviewed-by.
- Patch 2: fold the reverse-xmas-tree reorder in with the unsigned int
  conversion, so it is no longer left over in patch 3.
- Patch 3: introduce a local "struct device *dev" and use it to shorten the
  board-data lines; return -ENODATA rather than -ENODEV when the board data
  is missing.
- Regenerated as a single coherent series (one tree, git format-patch
  --cover-letter) with a proper diffstat, and sent as a new thread.
  Apologies for the malformed v8 posting.

Earlier changelogs are in the v7 and v8 postings:
  v8: https://lore.kernel.org/all/20260826112452.13539-1-tchatard@gmail.com/
  v7: https://lore.kernel.org/all/20260819140107.1329091-1-tchatard@gmail.com/

Tested on Ubuntu 25.10 (kernel 6.17.0-22-generic) and Ubuntu 26.04 (kernel
7.0.0-30-generic): both cameras working in Zoom, Chrome, and GNOME Camera
via PipeWire. Also independently tested on the closely-related Dell Latitude
5290 2-in-1 (same IPU3/TPS68470/OV5670/OV8858/DW9714 stack) by Vitalii
Tytskyi:
  https://github.com/vitovt/dell-5290-camera-kernel/tree/master/patches

Thierry Chatard (6):
  mfd: intel-lpss: add resource conflict quirk for Dell Latitude 5285
  platform/x86: int3472: tps68470: use unsigned int for GPIO lookup loop
    counters
  platform/x86: int3472: tps68470: fix clock consumer registration for
    Dell Latitude 5285
  platform/x86: int3472: tps68470: add board data for Dell Latitude 5285
  media: ipu-bridge: add sensor configuration for OV8858 (INT3477)
  media: ov8858: add ACPI device ID INT3477

 drivers/media/i2c/ov8858.c                    |   7 +
 drivers/media/pci/intel/ipu-bridge.c          |   2 +
 drivers/mfd/intel-lpss-acpi.c                 |  32 ++++
 drivers/platform/x86/intel/int3472/tps68470.c | 109 ++++++-----
 drivers/platform/x86/intel/int3472/tps68470.h |  10 ++
 .../x86/intel/int3472/tps68470_board_data.c   | 170 +++++++++++++++++-
 6 files changed, 281 insertions(+), 49 deletions(-)


base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f
-- 
2.53.0