Re: [PATCH RFC 04/10] base: power: Add generic OF-based power domainlook-up

[Tomasz Figa]

Hi Kevin,

On 14.01.2014 16:42, Kevin Hilman wrote:
> Tomasz Figa <tomasz.figa@xxxxxxxxx> writes:
>
> > This patch introduces generic code to perform power domain look-up using
> > device tree and automatically bind devices to their power domains.
> > Generic device tree binding is introduced to specify power domains of
> > devices in their device tree nodes.
> >
> > Backwards compatibility with legacy Samsung-specific power domain
> > bindings is provided, but for now the new code is not compiled when
> > CONFIG_ARCH_EXYNOS is selected to avoid collision with legacy code. This
> > will change as soon as Exynos power domain code gets converted to use
> > the generic framework in further patch.
> >
> > Signed-off-by: Tomasz Figa <tomasz.figa@xxxxxxxxx>
>
> I haven't read through this in detail yet, but wanted to make sure that
> the DT representation can handle nested power domains.  At least
> SH-mobile has a hierarchy of power domains and the genpd code can handle
> that, so wanted to make sure that the DT representation can handle it as
> well.

The representation of power domains themselves as implied by this patch 
is fully platform-specific. The only generic part is the 
#power-domain-cells property, which defines the number of cells needed 
to identify the power domain of given provider. You are free to have any 
platform-specific properties (or even generic ones, added on top of this 
patch) to let you specify the hierarchy in DT.

Best regards,
Tomasz
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/