On Fri, Aug 19, 2011 at 2:20 PM, Simon Horman [off-list ref] wrote:
...

Moreover, I think that there needs to be some agreement between Guennadi
and yourself with regards to what IRQ combinations are valid before I (or
anyone else) can implement something that is acceptable to you both. And
I think that in the mean time the current implementation is reasonable
given that it works with all current use-cases (and several non-existent
ones too).

The most common use cases for SDHI are:

Soldered-on SD/MMC hardware:
1) SDIO module (for wifi for instance)
Data IRQ + SDIO IRQ

2) eMMC chip
Data IRQ

External SD/MMC slot:
3) On hardware platforms with GPIO hotplug:
Data IRQ + SDIO IRQ

4) On hardware platforms without GPIO hotplug:
Hotplug IRQ + Data IRQ + SDIO IRQ

Legacy support:
5) Common ISR
All present IRQs

To keep things simple and flexible I would prefer if the platform
device could freely specify which interrupts to make use of. And still
have the legacy behavior.

Thanks,

/ magnus