On Tue, Aug 12, 2014 at 06:52:02PM -0700, Stephen Boyd wrote:
On 08/12/14 12:43, Lina Iyer wrote:
This is version #2 of the patches for cpuidle driver and its dependencies.
Changes from version #1/RFC:
- Remove hotplug from the patch series. Will submit it seprately.
- Fix SPM drivers per the review comments
- Modify patch sequence to compile SPM drivers independent of msm-pm, so as to
allow wfi() calls to use SPM even without SoC interface driver.
8074 like any ARM SoC can do architectural clock gating, that helps save on
power, but not enough of leakage power. Leakage power of the SoC can be
further reduced by turning off power to the core. To aid this, every core (cpu
and L2) is accompanied by a Sub-system Power Manager (SPM), that can be
configured to indicate the low power mode, the core would be put into and the
SPM programs the peripheral h/w accordingly to enter low power and turn off the
power rail to the core.
General question before I go diving into the code, can this code use the
pending generic cpuidle state bindings[1]? Last I saw those bindings
looked pretty good.
My bindings look similiar to the cpuidle bindings for exynos in this
patch.
[1] http://lwn.net/Articles/606080/
Thanks for the link. I am working on a similar DT binding for an SoC
Idle driver.
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