linux-kernel - Re: [PATCH v5 3/7] ARM: dts: Exynos542x/5800: add CPU OPP properties

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Date:	Fri, 11 Dec 2015 09:02:53 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Javier Martinez Canillas <javier@....samsung.com>
Cc:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Thomas Abraham <thomas.ab@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Mike Turquette <mturquette@...libre.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Ben Gamari <ben@...rt-cactus.org>,
	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>,
	Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>,
	Anand Moon <linux.amoon@...il.com>,
	linux-samsung-soc@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Doug Anderson <dianders@...omium.org>,
	Andreas Faerber <afaerber@...e.de>
Subject: Re: [PATCH v5 3/7] ARM: dts: Exynos542x/5800: add CPU OPP properties

On 11-12-15, 00:25, Javier Martinez Canillas wrote:
> The problem is that the big and LITTLE cores have different ordering per SoCs:
> 
> - Exynos5420 and Exynos5800: cpu0-3 (Cortex-A15) and cpu4-7 (Coretx-A7)
> - Exynos5422: cpu0-3 (Cortex-A7) and cpu4-7 (Cortex-A15)
> 
> So the OPP tables are set in this DTSI file, to prevent the OPP tables
> in the Exynos5422 to be inverted for the cluster 0 and 1.

Oh dude, that's really *ugly*. :)

Reusing files/definitions is fine to the point where things are
readable. But you have screwed it up so very badly.

Over that, why can't you keep cpu0-3 as A7 and 4-7 as a15 for all the
cases? The only worrying thing for you should be that CPU0 within the
kenrel should be controllable, right? i.e. you want a A15 to boot 5800
and A7 to boot 5422.

If yes, than you could have kept the CPUs in 5422 as:
0-3: A7
4-7: A15

and in 5420 as:
4-7: A15
0-3: A7

Wouldnt' that work ?

-- 
viresh
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