auxiliary bus/drivers feature set versus platform/mfd

I'm looking at switching from platform drivers (via mfd subsystem) to 
auxiliary bus/device drivers.  There is a lot of functionality available for
platform devices and MFD subsystem.  I'm wondering if there are any
plans to enhance auxiliary devices to share some of these features?

Some examples include:

     platform_get_resource
     platform_get_irq{_optional}
     mfd_acpi_add_device
     PLATFORM_DEVID_NONE
     PLATFORM_DEVID_AUTO