On Mon, Jul 3, 2017 at 7:08 PM, Gabriele Paoloni
[off-list ref] wrote:

JFYI: Mika on vacation.

I had a look into the MFD framework. If my understanding is correct the mfd
framework create a platform device for each declared mfd_cell that is passed
to mfd_add_devices().

Right.

However there is something that I do not quite understand:
from
http://elixir.free-electrons.com/linux/latest/source/drivers/mfd/mfd-core.c#L207
it seems that mfd_add_device() will create the platform device using the
resources that are statically declared in the respective mfd_cell.

It's one possibility.

In my case I'd like to have a platform device using the resources that are
parsed from the ACPI table (i.e. as it is done now by
acpi_create_platform_device()).

So far so good. Nothing prevents you to do that.

If my understanding is correct, if I declared an mfd_cell for my IPMI child
the mfd subsystem would create a platform device for such child and
therefore acpi_create_platform_device() would fail to create a new platform
device as adev->physical_node_count will be non zero.
However as things stand now mfd_cell devices can only use the resources
that are statically defined in the code (and therefore not the ones in the
ACPI nodes)...am I right?

You may file resources first and then register MFD cells. See many
existing examples in the kernel.

-- 
With Best Regards,
Andy Shevchenko