Hi Andy

[...]

JFYI: Mika on vacation.

Thanks for letting me know

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I had a look into the MFD framework. If my understanding is correct

the mfd

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framework create a platform device for each declared mfd_cell that is

passed

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to mfd_add_devices().

Right.

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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

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it seems that mfd_add_device() will create the platform device using

the

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resources that are statically declared in the respective mfd_cell.

It's one possibility.

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In my case I'd like to have a platform device using the resources

that are

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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.

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If my understanding is correct, if I declared an mfd_cell for my IPMI

child

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the mfd subsystem would create a platform device for such child and
therefore acpi_create_platform_device() would fail to create a new

platform

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device as adev->physical_node_count will be non zero.
However as things stand now mfd_cell devices can only use the

resources

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that are statically defined in the code (and therefore not the ones

in the

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ACPI nodes)...am I right?

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

Well I had a look around the Kernel I have seen no mfd cells using
Resources that are not statically defined:
i.e. cell->resources in mfd_add_device() always points to statically
defined resource structures.

Usually for ACPI devices first you need to parse the ACPI resources
from the table calling acpi_dev_get_resources(), then you iterate 
over the resource list and fill the resource array by calling
acpi_platform_fill_resurces() (as in acpi_create_platform_device())

With respect to my case are you suggesting dynamically allocate a
resource array and fill it using the same fashion as 
acpi_create_platform_device(), then point cell->resources to such
array before calling mfd_add_device() ?

Thanks
Gab

--
With Best Regards,
Andy Shevchenko