Unfortunately, there are two efforts underway that makes this confusing
and I think require a bit more than the short summary requested. A one
paragraph summary can't address the why and how. This email briefly
describes the why and the differences.
There are two main reasons for both these efforts:
- existing power management interfaces do not enable the power
management features on the latest SOC's used in embedded mobile
devices
- existing power management interfaces do not provide the API necessary
to build power managers (userspace and/or kernel space) that optimize
power consumption to level required by embedded mobile devices
PowerOP
Focus is on a platform independent interface for selecting and creating
operating points. We want to get the basic power management block in
place and build on it. Integrating with other existing power
management interfaces as it makes sense. The first natural integration
point is the cpufreq_driver layer in cpufreq and does not affect the
userspace interface.
OPpoint
Goal is to show how all existing interfaces can use the operating point
concept. It is more than an interface for selecting and creating
operating points. It integrates with cpufreq and sleep states defining
new userspace interfaces and using existing interfaces in different
ways. There are a lot of issues with the OPpoint operating point
interface that was discussed here:
http://lists.osdl.org/pipermail/linux-pm/2006-August/003541.html .
Many objections to the sleep state integration. Most of the negative
comments about cpufreq are about the OPpoint patches.
I have not seen or heard any justification for the OPpoint patches to
create a different operating point interface.
Matt
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