Status of arch/arm in linux-next

[Arnd Bergmann]

On Thursday 21 April 2011, Linus Walleij wrote:
> > The PRCMU is the Power Reset and Control Management Unit,
> > it is a register pages where you send commands to a firmware
> > running on its own CPU on the other side, partly using mailboxes.
> > The firmware handles things like voltage and power domains
> > (modeled as regulators), frequency changes (using CPUfreq),
> > idle states (CPUidle and sleep, idling), as well as resetting
> > particular memory blocks AND an I2C channel to the AB8500
> > chip (driven from drivers/ab8500-core.c indeed) and some
> > GPIO configuration.
> 
> Reading what I just wrote makes me think this beast may belong
> in drivers/mfd.
> 
> Samuel, would you say I can push this driver to MFD?
> 
> Most MFD things are, like I2C chips and stuff but this one sure
> match the title "multifunctional device", just that it's very singleton
> and very close to the SoC core.

One property of MFD devices is that they register a fixed set of
child devices (cells) that are each providing separate functionality
and have their own drivers. If that's not the case with prcmu,
I think it should not be an MFD driver.

	Arnd