linux-kernel - Re: [PATCH v6 1/8] Documentation: arm: define DT cpu capacity-dmips-mhz bindings

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Date:   Tue, 30 Aug 2016 17:11:58 +0100
From:   Juri Lelli <juri.lelli@....com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King - ARM Linux <linux@....linux.org.uk>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Mark Brown <broonie@...nel.org>,
        Pawel Moll <pawel.moll@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Kumar Gala <galak@...eaurora.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Olof Johansson <olof@...om.net>,
        Gregory CLEMENT <gregory.clement@...e-electrons.com>,
        Paul Walmsley <paul@...an.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: Re: [PATCH v6 1/8] Documentation: arm: define DT cpu
 capacity-dmips-mhz bindings

On 16/08/16 11:02, Vincent Guittot wrote:
> On 19 July 2016 at 14:40, Juri Lelli <juri.lelli@....com> wrote:
> > ARM systems may be configured to have cpus with different power/performance
> > characteristics within the same chip. In this case, additional information
> > has to be made available to the kernel (the scheduler in particular) for it
> > to be aware of such differences and take decisions accordingly.
> >
> > Therefore, this patch aims at standardizing cpu capacities device tree
> > bindings for ARM platforms. Bindings define cpu capacity-dmips-mhz
> > parameter, to allow operating systems to retrieve such information from
> > the device tree and initialize related kernel structures, paving the way
> > for common code in the kernel to deal with heterogeneity.
> >

[...]

> 
> FWIW, Acked-by Vincent Guittot <vincent.guittot@...aro.org>
> 

Thanks!

Best,

- Juri