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

From: Tomasz Figa
Date: Mon Jan 20 2014 - 11:24:41 EST

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

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,
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