TPS68470 missing board-data for Dell Latitude 7320 Detachable (IPU6, OV8856)

[surijanB]

System Information

• Model: Dell Latitude 7320 Detachable
• DMI system-product-name: Latitude 7320 Detachable
• DMI baseboard-product-name: 0TNW0H
• BIOS version: 1.45.0
• Manufacturer: Dell Inc.
• OS: Ubuntu 26.04 (resolute)
• Kernel: 7.0.0-22-generic
• Camera Sensor: OmniVision OV8856 (ACPI: OVTI8856:00)
• Power Controller: TPS68470 (ACPI: INT3472:07), REVID 0x21
• IPU: Intel IPU6 (Device 0x9a19), PCI 0000:00:05.0

Problem

Camera does not work. The IPU6 driver correctly detects the connected sensor:

[ 4.234092] intel-ipu6 0000:00:05.0: Found supported sensor OVTI8856:00
[ 4.234180] intel-ipu6 0000:00:05.0: Connected 1 cameras
[ 4.239303] intel-ipu6 0000:00:05.0: Sending BOOT_LOAD to CSE
[ 4.248666] intel-ipu6 0000:00:05.0: Sending AUTHENTICATE_RUN to CSE
[ 4.320510] intel-ipu6 0000:00:05.0: CSE authenticate_run done
[ 4.320521] intel-ipu6 0000:00:05.0: IPU6-v0[9a19] hardware version 1

However, the TPS68470 PMIC fails to find board-data for this model, so the sensor never receives power:

[ 4.700093] int3472-tps68470 i2c-INT3472:07: TPS68470 REVID: 0x21
[ 4.700260] int3472-tps68470 i2c-INT3472:07: error -ENODEV: No board-data found for this model

As a result:

• The OV8856 never appears on the I2C bus (ls /sys/bus/i2c/devices/ shows nothing for it)
• media-ctl -p shows the IPU6 CSI2 receivers with unconnected SINK,MUST_CONNECT pads — no sensor entity is present in the graph
• cam -l (libcamera-tools) reports "No sensor found for /dev/media0"

What I've already ruled out

• ov8856 kernel module is loaded successfully (lsmod confirms it, ipu_bridge and v4l2_async/v4l2_fwnode all load without error)
• intel-ipu6-dkms is installed and working at the IPU/CSE level
• This is not a Secure Boot / lockdown issue — I disabled Secure Boot and the failure is unchanged; it happens purely at PMIC board-data lookup
• Dynamic debug confirms the driver returns -ENODEV immediately on DMI board-data lookup, before reaching any GPIO/regulator mapping code — so there's nothing for me to introspect at runtime; the wiring info needs to be added as a static board_data entry, similar to the existing Dell Latitude 7212 Rugged Extreme Tablet entry.

Request

Could someone with access to a Dell Latitude 7320 Detachable reference design (or contacts at Dell) help identify and add the correct TPS68470 board-data entry (regulator rail mapping for avdd/dvdd/dovdd, and GPIO pin assignment for reset/powerdown/clock-enable) for this model? Happy to test any proposed patch on the actual hardware and report back with dmesg / media-ctl output.

I attempted to extract the DSDT myself for cross-referencing, but ran into a recurring iasl disassembly issue (Unterminated quoted string, Maximum error count (200) exceeded) that prevented producing a usable .dsl file. Happy to provide the raw dsdt.dat/ACPI table dump if that's useful to a maintainer who can work around the iasl issue, or any other diagnostics needed.

dsdt-latitude7320.dat.gz

Hardware reference (similar known-working entries for comparison)

This appears analogous to previously-reported cases:

• TPS68470 missing board-data for MSI Prestige 14 AI+ Evo (Lunar Lake, OV5675) #414 (MSI Prestige 14 AI+ Evo, OV5675, same "No board-data found" failure mode)
• Launchpad bug 2121826 (Dell Latitude 5290 2-in-1, same failure mode, resolved by reusing the Dell Latitude 7212 Rugged Extreme Tablet board-data entry)

[Ra72xx]

Subscribing, same problem...