From: khilman@kernel•org (Kevin Hilman)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH RFC 3/3] PM / Domains: Introduce generic PM domain for cpu domain
Date: Wed, 10 Jun 2015 14:37:57 -0700 [thread overview]
Message-ID: <7hmw07meh6.fsf@deeprootsystems.com> (raw)
In-Reply-To: <1433456946-53296-4-git-send-email-lina.iyer@linaro.org> (Lina Iyer's message of "Thu, 4 Jun 2015 16:29:06 -0600")
Lina Iyer <lina.iyer@linaro•org> writes:
> Generally cpus are grouped under a power domain in a SoC. When all cpus
> in the domain are in their power off state, the cpu domain can also be
> powered off.
How does this relate to a cluster, and why aren't you using that terminolgy?
> Genpd provides the framework for defining cpus as devices
> that are part of a cpu domain.
>
> Introduce support for defining and adding a generic power domain for the
> cpus based on the DT specification of power domain providers and
> consumers. SoC's that have the cpu domain defined in their DT, can
> setup a genpd with a name and the power_on/power_off callbacks. Calling
> pm_cpu_domain_init() will register the genpd and attach the cpus for
> this domain with the genpd.
>
> CPU_PM notifications for are used to pm_runtime_get_sync() and
> pm_runtime_put_sync() for each cpu. When all cpus are powered off, the
> last cpu going down would call the genpd->power_off(). Correspondingly,
> the first cpu up would call the genpd->power_on() callback before
> resuming from idle.
Other patches also mention this genpd being useful to gate power to
non-CPU peripherals on the same power rail. How are those devices to be
added?
Without seeing the DTs and the init code that might call
pm_cpu_domain_init(), it's hard for me to see how this is intended to be
used. Could you also include a patch that shows how this is initialized
and the DT additions? Ideally, it should also show how a non-CPU device
would be included.
Kevin
next prev parent reply other threads:[~2015-06-10 21:37 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-04 22:29 [PATCH RFC 0/3] PM / Domains: Generic PM domains for cpus Lina Iyer
2015-06-04 22:29 ` [PATCH RFC 1/3] PM / Domains: Allocate memory outside domain locks Lina Iyer
2015-06-07 8:35 ` Krzysztof Kozlowski
2015-06-09 22:45 ` Lina Iyer
2015-06-10 17:33 ` Kevin Hilman
2015-06-04 22:29 ` [PATCH RFC 2/3] PM / Domains: Support atomic PM domains Lina Iyer
2015-06-07 9:21 ` Krzysztof Kozlowski
2015-06-10 16:13 ` Lina Iyer
2015-06-11 0:13 ` Krzysztof Kozlowski
2015-06-11 14:33 ` Lina Iyer
2015-06-10 18:04 ` Kevin Hilman
2015-06-10 20:35 ` Lina Iyer
2015-06-11 9:41 ` Ulf Hansson
2015-06-11 19:47 ` Lina Iyer
2015-06-11 21:13 ` Ulf Hansson
2015-06-04 22:29 ` [PATCH RFC 3/3] PM / Domains: Introduce generic PM domain for cpu domain Lina Iyer
2015-06-07 9:42 ` Krzysztof Kozlowski
2015-06-10 16:57 ` Lina Iyer
2015-06-11 0:27 ` Krzysztof Kozlowski
2015-06-11 14:42 ` Lina Iyer
2015-06-10 17:01 ` Kevin Hilman
2015-06-11 0:35 ` Krzysztof Kozlowski
2015-06-10 21:37 ` Kevin Hilman [this message]
2015-06-11 14:56 ` Lina Iyer
2015-06-15 18:43 ` Kevin Hilman
2015-06-15 19:14 ` Lina Iyer
2015-06-16 15:50 ` Kevin Hilman
2015-06-10 17:24 ` [PATCH RFC 0/3] PM / Domains: Generic PM domains for cpus Kevin Hilman
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