From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Mark Rutland <Mark.Rutland@arm.com>,
Catalin Marinas <Catalin.Marinas@arm.com>,
Tomasz Figa <t.figa@samsung.com>,
Lina Iyer <lina.iyer@linaro.org>,
Chander Kashyap <k.chander@samsung.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
"ashwin.chaugule@linaro.org" <ashwin.chaugule@linaro.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"grant.likely@linaro.org" <grant.likely@linaro.org>,
Charles Garcia-Tobin <Charles.Garcia-Tobin@arm.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Kevin Hilman <khilman@linaro.org>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
Sebastian Capella <sebcape@gmail.com>,
Mark Brown <broonie@kernel.org>, Antti Miettinen <ananaza@iki.fi>,
Paul Walmsley <paul@pwsan.com>,
Geoff Levand <geoff@infradead.org>,
Peter De Schrijver <pdeschrijver@nv>
Subject: Re: [PATCH v7 3/8] drivers: cpuidle: implement DT based idle states infrastructure
Date: Thu, 14 Aug 2014 17:02:12 +0100 [thread overview]
Message-ID: <20140814160212.GA5328@red-moon> (raw)
In-Reply-To: <alpine.LFD.2.11.1408141142530.29347@knanqh.ubzr>
On Thu, Aug 14, 2014 at 04:47:57PM +0100, Nicolas Pitre wrote:
> On Thu, 14 Aug 2014, Lorenzo Pieralisi wrote:
>
> > On Wed, Aug 13, 2014 at 06:29:49PM +0100, Nicolas Pitre wrote:
> > > So if you tell me a messed-up DT won't bear much consequences then I'm
> > > fine with that.
> >
> > Nico, on second thoughts, since Ashwin raised the point too and I think
> > that at these early stages it might turn out useful, I gave coding
> > the check a go. I tried to make the check self contained so that we can
> > yank it out if we do not want it in the final version or we will want
> > to remove it later.
> >
> > Here the refreshed patch is:
> >
> > -- >8 --
> > Subject: [PATCH] drivers: cpuidle: implement DT based idle states
> > infrastructure
> >
> > On most common ARM systems, the low-power states a CPU can be put into are
> > not discoverable in HW and require device tree bindings to describe
> > power down suspend operations and idle states parameters.
> >
> > In order to enable DT based idle states and configure idle drivers, this
> > patch implements the bulk infrastructure required to parse the device tree
> > idle states bindings and initialize the corresponding CPUidle driver states
> > data.
> >
> > The parsing API accepts a start index that defines the first idle state
> > that should be initialized by the parsing code in order to give new and
> > legacy driver flexibility over which states should be parsed using the
> > new DT mechanism.
> >
> > The idle states list is obtained from the first cpu in the driver
> > cpumask, which implicitly means the parsing code expects idle states
> > (and related list of phandles) to be the same for all CPUs in the
> > CPUidle driver mask. The kernel does not check this assumption, it must
> > be enforced by the bootloader to ensure correct system behaviour.
>
> Is this last sentence still true?
Nope, you are right. Fixed the commit log, a stale comment in the code
and dt nodes ref counting, if I get no additional comments I will post
this patch with v8, that should be final.
Thank you !!!
Lorenzo
WARNING: multiple messages have this Message-ID (diff)
From: lorenzo.pieralisi@arm.com (Lorenzo Pieralisi)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v7 3/8] drivers: cpuidle: implement DT based idle states infrastructure
Date: Thu, 14 Aug 2014 17:02:12 +0100 [thread overview]
Message-ID: <20140814160212.GA5328@red-moon> (raw)
In-Reply-To: <alpine.LFD.2.11.1408141142530.29347@knanqh.ubzr>
On Thu, Aug 14, 2014 at 04:47:57PM +0100, Nicolas Pitre wrote:
> On Thu, 14 Aug 2014, Lorenzo Pieralisi wrote:
>
> > On Wed, Aug 13, 2014 at 06:29:49PM +0100, Nicolas Pitre wrote:
> > > So if you tell me a messed-up DT won't bear much consequences then I'm
> > > fine with that.
> >
> > Nico, on second thoughts, since Ashwin raised the point too and I think
> > that at these early stages it might turn out useful, I gave coding
> > the check a go. I tried to make the check self contained so that we can
> > yank it out if we do not want it in the final version or we will want
> > to remove it later.
> >
> > Here the refreshed patch is:
> >
> > -- >8 --
> > Subject: [PATCH] drivers: cpuidle: implement DT based idle states
> > infrastructure
> >
> > On most common ARM systems, the low-power states a CPU can be put into are
> > not discoverable in HW and require device tree bindings to describe
> > power down suspend operations and idle states parameters.
> >
> > In order to enable DT based idle states and configure idle drivers, this
> > patch implements the bulk infrastructure required to parse the device tree
> > idle states bindings and initialize the corresponding CPUidle driver states
> > data.
> >
> > The parsing API accepts a start index that defines the first idle state
> > that should be initialized by the parsing code in order to give new and
> > legacy driver flexibility over which states should be parsed using the
> > new DT mechanism.
> >
> > The idle states list is obtained from the first cpu in the driver
> > cpumask, which implicitly means the parsing code expects idle states
> > (and related list of phandles) to be the same for all CPUs in the
> > CPUidle driver mask. The kernel does not check this assumption, it must
> > be enforced by the bootloader to ensure correct system behaviour.
>
> Is this last sentence still true?
Nope, you are right. Fixed the commit log, a stale comment in the code
and dt nodes ref counting, if I get no additional comments I will post
this patch with v8, that should be final.
Thank you !!!
Lorenzo
next prev parent reply other threads:[~2014-08-14 16:02 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-13 15:51 [PATCH v7 0/8] ARM generic idle states Lorenzo Pieralisi
2014-08-13 15:51 ` Lorenzo Pieralisi
2014-08-13 15:52 ` [PATCH v7 1/8] arm64: kernel: refactor the CPU suspend API for retention states Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-18 7:47 ` Hanjun Guo
2014-08-18 7:47 ` Hanjun Guo
2014-08-18 14:20 ` Catalin Marinas
2014-08-18 14:20 ` Catalin Marinas
2014-08-13 15:52 ` [PATCH v7 2/8] Documentation: arm: define DT idle states bindings Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
[not found] ` <1407945127-27554-3-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2014-08-13 19:25 ` Lina Iyer
2014-08-13 19:25 ` Lina Iyer
2014-08-13 22:11 ` Lorenzo Pieralisi
2014-08-13 22:11 ` Lorenzo Pieralisi
2014-08-15 17:20 ` Lina Iyer
2014-08-15 17:20 ` Lina Iyer
2014-08-15 17:51 ` Lorenzo Pieralisi
2014-08-15 17:51 ` Lorenzo Pieralisi
2014-08-18 14:20 ` Catalin Marinas
2014-08-18 14:20 ` Catalin Marinas
2014-08-13 15:52 ` [PATCH v7 3/8] drivers: cpuidle: implement DT based idle states infrastructure Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-13 16:31 ` Nicolas Pitre
2014-08-13 16:31 ` Nicolas Pitre
2014-08-13 17:04 ` Lorenzo Pieralisi
2014-08-13 17:04 ` Lorenzo Pieralisi
2014-08-13 17:29 ` Nicolas Pitre
2014-08-13 17:29 ` Nicolas Pitre
2014-08-14 11:29 ` Lorenzo Pieralisi
2014-08-14 11:29 ` Lorenzo Pieralisi
2014-08-14 15:47 ` Nicolas Pitre
2014-08-14 15:47 ` Nicolas Pitre
2014-08-14 16:02 ` Lorenzo Pieralisi [this message]
2014-08-14 16:02 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
2014-08-13 15:52 ` [PATCH v7 4/8] arm64: kernel: introduce cpu_init_idle CPU operation Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
[not found] ` <1407945127-27554-1-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2014-08-13 15:52 ` [PATCH v7 5/8] arm64: add PSCI CPU_SUSPEND based cpu_suspend support Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
2014-08-13 15:52 ` [PATCH v7 6/8] drivers: cpuidle: CPU idle ARM64 driver Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 22:30 ` Lorenzo Pieralisi
2014-08-18 22:30 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 22:25 ` Lorenzo Pieralisi
2014-08-18 22:25 ` Lorenzo Pieralisi
2014-08-13 15:52 ` [PATCH v7 7/8] drivers: cpuidle: initialize big.LITTLE driver through DT Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
2014-08-13 15:52 ` [PATCH v7 8/8] drivers: cpuidle: initialize Exynos " Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-15 21:12 ` Lina Iyer
2014-08-15 21:12 ` Lina Iyer
2014-08-15 21:40 ` Lorenzo Pieralisi
2014-08-15 21:40 ` Lorenzo Pieralisi
2014-08-15 21:45 ` Lina Iyer
2014-08-15 21:45 ` Lina Iyer
2014-08-15 21:52 ` Lorenzo Pieralisi
2014-08-15 21:52 ` Lorenzo Pieralisi
2014-08-18 14:22 ` Catalin Marinas
2014-08-18 14:22 ` Catalin Marinas
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