[PATCH 00/23] RFC: exynos multiplatform support

Arnd Bergmann arnd at arndb.de
Wed Mar 6 22:02:46 EST 2013


On Wednesday 06 March 2013, Thierry Reding wrote:
> > Option 2 would probably come down to having a trivial MFD driver exposing
> > a regmap. You can probably reuse drivers/mfd/syscon.c for this and make
> > the node compatible with "syscon" to designate the clock registers as
> > a system-wide resource, making the other device nodes register-less.
> 
> I think option 2 is the standard method if one hardware block provides
> several logical devices. I find it to be a pretty nice solution to this
> problem. We also have precedent in the PWM subsystem. The TWL chips for
> instance use it to create a platform device which is later driven by a
> PWM driver.

One difference though is that the TWL chip is a heterogenous MFD that has
a lot of different sub-devices, where in case of Exynos the timer device
has a set of identical units, each of which can be used either as a PWM or
as a clocksource or other timer.

	Arnd



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