[PATCH v2 0/4] Lenovo ThinkPad X1 Carbon Gen 14 IR camera: ST VD55G1 on Intel IPU7

[Ruslan Koreev]

The ThinkPad X1 Carbon Gen 14 (Panther Lake, Intel IPU7) has a second
MIPI camera for Windows Hello: an ST VD55G1 monochrome global-shutter
sensor, enumerated by ACPI as TBE20A1, with one CSI-2 lane. It is
powered through an INT3472 discrete device that provides a power enable
GPIO, a reset GPIO, a privacy LED and a 19.2 MHz clock. Only the analog
supply has a GPIO; vcore and vddio fall back to dummy regulators. The
RGB camera of the same laptop (Sony IMX471, TBE20A0) is already
supported.

Patch 1 maps the INT3472 power enable GPIO to the supply name the
vd55g1 driver expects, patch 2 adds the ipu-bridge entry, patch 3 lets
the vd55g1 driver defer its probe while the bridge has not attached the
CSI-2 endpoint yet, and patch 4 adds the ACPI match.

Tested on next-20260924 with the ipu6 driver handling the IPU7: the
sensor probes, ipu-bridge connects both cameras, libcamera streams Y8
804x704 at 58 fps, Y10 and Y10P stream with plain V4L2, and with the IR
illuminator on the frames are good enough for face authentication with
howdy.

About the privacy LED Benjamin mentioned on v1: the V4L2 core switches
it when streaming starts and stops, not when the sensor is powered, so
powering up at probe does not light it. vd55g1 does not hand the LED to
the core yet, as it registers with v4l2_async_register_subdev() rather
than v4l2_async_register_subdev_sensor(), so for now the LED also stays
off while streaming. I can send that change as a separate patch.

Peter Marshall's VD55G0 series (linux-media, September 2026) adds the
SMO55F0 HID to the same ipu-bridge and INT3472 tables, so whichever
series lands second needs a trivial rebase.

Changes in v2:
- Dropped the staging ipu7 patch: the ipu6 driver, which takes over
  IPU7, already has the monochrome formats (Sakari).
- Split the vd55g1 change in two and let vd55g1_check_csi_conf()
  return the endpoint parser's error code instead of checking the
  endpoint beforehand (Sakari).
- Trimmed the commit messages, moved the hardware description here and
  dropped the comment above the ACPI table (Sakari).
- Added Benjamin's Acked-by to patches 1 and 2.
- Rebased on media-committers next.

v1: https://lore.kernel.org/linux-media/20260924171820.1179823-1-koreev.r@xxxxxxxxx/

Ruslan Koreev (4):
  platform/x86: int3472: Map the VD55G1 power enable GPIO to "vana"
  media: ipu-bridge: Add the ST VD55G1 (TBE20A1)
  media: i2c: vd55g1: Return the endpoint parser's error code
  media: i2c: vd55g1: Add ACPI support

 drivers/media/i2c/vd55g1.c                    | 14 ++++++++------
 drivers/media/pci/intel/ipu-bridge.c          |  2 ++
 drivers/platform/x86/intel/int3472/discrete.c |  1 +
 3 files changed, 11 insertions(+), 6 deletions(-)


base-commit: 58348f64125e9a3e44d3abb275ca7f4e6c9641e5
-- 
2.55.0