Re: [PATCH 1/5] PM / Runtime: Support for generic I/O power domains (v4)

[Guennadi Liakhovetski <g.liakhovetski@gmx.de>]

On Sat, 28 May 2011, Rafael J. Wysocki wrote:

> From: Rafael J. Wysocki <rjw@sisk.pl>
> 
> Introduce common headers, helper functions and callbacks allowing
> platforms to use simple generic power domains for runtime power
> management.
> 
> Introduce struct generic_power_domain to be used for representing
> power domains that each contain a number of devices and may be
> master domains or subdomains with respect to other power domains.
> Among other things, this structure includes callbacks to be
> provided by platforms for performing specific tasks related to
> power management (i.e. ->stop_device() may disable a device's
> clocks, while ->start_device() may enable them, ->power_off() is
> supposed to remove power from the entire power domain
> and ->power_on() is supposed to restore it).

I've got a generic question to this: do we have any examples of 
power-domain specific ->start_device() and ->stop_device() callbacks? A 
common case is, when these callbacks start and stop clocks, associated 
with the device, but this is not power-domain specific, right? Do we have 
any examples of different power domains in a system, having different 
these calbacks, but all devices in one power-domain, having the same ones?

Thanks
Guennadi
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Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/