Hi Andy [...] > > JFYI: Mika on vacation. Thanks for letting me know > > > 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. 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
