linux-kernel - Re: [PATCH v5 0/12] cpufreq: Add support for Exynos 5800, 5420, and 5422

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Message-ID: <20151203060527.GH4302@ubuntu>
Date:	Thu, 3 Dec 2015 11:35:27 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Ben Gamari <ben@...rt-cactus.org>,
	Sudeep Holla <Sudeep.Holla@....com>
Cc:	Thomas Abraham <thomas.ab@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Michael Turquette <mturquette@...libre.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Lukasz Majewski <l.majewski@...sung.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Kevin Hilman <khilman@...aro.org>,
	Javier Martinez Canillas <javier@...hile0.org>,
	Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>,
	Anand Moon <linux.amoon@...il.com>,
	linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, b.zolnierkie@...sung.com
Subject: Re: [PATCH v5 0/12] cpufreq: Add support for Exynos 5800, 5420, and
 5422

Hi Ben,

On 02-12-15, 22:19, Ben Gamari wrote:
> 
> This patch series adds cpufreq support for the Exynos 5800, 5420, and 5422
> SOCs. In particular, it adds support for operating-points-v2 bindings to the
> arm-big-little cpufreq driver and updates the above-mentioned SOCs' devicetrees
> to take advantage of this support. There are also a couple of patches improving
> the clarify of the arm-big-little implementation. It is built on a set posted
> by Bartlomiej Zolnierkiewicz in April 2015.
> 
> The most signficant change from the original series is porting to the
> operating-points-v2 devicetree bindings. The series has been tested by me on
> and Odroid XU4 and by Javier Martinez Canillas on a Peach Pit.

Thanks for working with opp-v2 bindings, really appreciate it.

But, before I start reviewing this series, I have few comments.
- We weren't able to use cpufreq-dt driver for big LITTLE platforms
  earlier, as it never had multi cluster support and we wanted
  clock-sharing information via DT.
- That is all fixed now.
- I want Samsung's big LITTLE platforms to use cpufreq-dt and drop
  arm_big_little driver completely.
- The only case for which it (arm_big_little) driver might be useful
  is the IKS solution. Which I don't believe you are going to use in
  future :)

My plan for the arm-big-little driver:
- Migrate all platforms to use cpufreq-dt instead for non-IKS
  solution
- Make arm-big-little driver arm-big-little-iks only driver.

@Sudeep: What would it take you to use cpufreq-dt for ARM's platforms
?

-- 
viresh
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