Re: [PATCH 18/18] ipu3: Add driver for dummy INT3472 ACPI device

[Dan Scally <djrscally@xxxxxxxxx>]

Hi Andy

On 01/12/2020 18:49, Andy Shevchenko wrote:

>  P.S. Dan, can you drop unrelated text when replying?

Ah - sure, sorry.
> Seems we can do this, by locating intel_int3472.c under PDx86 hood and dropping
> ACPI ID table from TPS68470 MFD driver. The PMIC can be instantiated via
> i2c_acpi_new_device() (IIRC the API name).
>
> And actually it makes more sense since it's not and MFD and should not be there.
>
> (Dan, patch wise the one creates intel_int3472.c followed by another one that
>  moves ACPI ID from PMIC and introduces its instantiation via I²C board info
>  structure)

I'm mostly following this, but why would we need an i2c_board_info or
i2c_acpi_new_device()? The INT3472 entries that refer to actual tps68470
devices do have an I2cSerialBusV2 enumerated in _CRS so in their case
there's an i2c device registered with the kernel already.


I think we need those things when we get round to handling the
VCM/EEPROM that's hidden within the sensor's ACPI entry, but I've not
done any work on that yet at all.