Re: [BUG] OV02C10 on Dell 16 Premium DA16250 (ARL): INT3472 handshake-derived "dvdd" regulator registered but never linked to sensor, sensor probe fails with -EREMOTEIO

[Marco Nenciarini]

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Samuele,

The _STA dump settles it, thanks for running it down. With DSC1/LTH1/CLP1 all
_STA=0 and only DSC0 (INT3472:0c) live, the OV02C10 has no live PMIC instance on
the DA16250, and the gate is a BIOS/NVS config (CL01/C1TP read but never
assigned, no _OSI branch), so acpi_osi spoofing can't reach it. avdd/dovdd/reset/
clock have no live provider to key to.

That closes the kernel angle: there is nothing for int3472 to fix here, and the
dvdd re-key, though correct, can't bring the sensor up. This is a Dell firmware
matter (the RGB-side PMIC topology left disabled in NVS), worth reporting to them
if you have a channel.

On the standalone dvdd second_sensor quirk: I'd hold off. The second_sensor
mechanism already exists; a dvdd_second_sensor field with no enabled board behind
it would be unused code, and the kernel doesn't carry a quirk that has no
consumer. If a board turns up that actually benefits, the field and its DMI entry
can land together in that series, with the consumer that justifies them. Until
then there is nothing to upstream.

Thanks again for the thorough work on this one.

Marco
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