Hi!
> PowerOP is a system power parameter management API submitted for
> discussion. PowerOP writes and reads power "operating points",
> comprised of arbitrary integer-valued values, called power parameters,
> that correspond to registers, clocks, dividers, voltage regulators,
> etc. that may be modified to set a basic power/performance point for the
> system. The core basically passes an array of integer-valued power
> parameters (with very little additional structure imposed by the core)
> to a platform-specific backend that interprets those values and makes
> the requested adjustments. PowerOP is intended to leave all power
> policy decisions to higher layers. An optional sysfs representation of
> power parameters is also available, primarily for diagnostic use.
>
> PowerOP can be thought of as a layer below cpufreq that actually
> accesses the hardware to make cpu frequency, voltage, core bus, and
> perhaps other modifications to set a power point, leaving cpufreq to
> manage the interfaces based around the "cpu frequency" abstraction, the
> policies and governors that select the frequency, its notifiers, and so
> forth. An example hooking up support for one cpufreq platform to
> PowerOP is in patch 3/3.
>
> Depending on the ability of the hardware to make software-controlled
> power/performance adjustments, this may be useful to select custom
> voltages, bus speeds, etc. in desktop/server systems. Various embedded
> systems have several parameters that can be set. For example, an XScale
> PXA27x could be considered to have six basic power parameters (mainly
> cpu run mode and memory and bus dividers) that for the most part
> should
This scares me a bit. Is table enough to handle this? I'm afraid that
table will get very large on systems that allow you to do "almost
anything".
Pavel
--
if you have sharp zaurus hardware you don't need... you know my address
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
| |
 |