linux-kernel - Re: [PATCH v4 2/8] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC

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Message-ID: <5937606.zM91rlE7sS@wuerfel>
Date:	Tue, 24 Feb 2015 10:50:47 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	kgene@...nel.org, mark.rutland@....com, marc.zyngier@....com,
	olof@...om.net, catalin.marinas@....com, will.deacon@....com,
	inki.dae@...sung.com, chanho61.park@...sung.com,
	sw0312.kim@...sung.com, jh80.chung@...sung.com,
	ideal.song@...sung.com, a.kesavan@...sung.com,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/8] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC

On Tuesday 24 February 2015 18:01:27 Chanwoo Choi wrote:
> On 02/24/2015 05:33 PM, Arnd Bergmann wrote:
> > On Tuesday 24 February 2015 14:16:45 Chanwoo Choi wrote:
> >> This patch adds new Exynos5433 dtsi to support 64-bit Exynos5433 SoC based on
> >> Octal core CPUs (quad Cortex-A57 and quad Cortex-A53). And Exynos5433 supports
> >> PSCI (Power State Coordination Interface) v0.1.
> >>
> >> This patch includes following dt node to support Exynos5433 SoC:
> >> 1. Octa core for big.LITTLE architecture
> >> - Cortex-A53 LITTLE Quad-core
> >> - Cortex-A57 big Quad-core
> >> - Support PSCI v0.1
> > 
> > Should we try to come up with a way to better share parts of this with the
> > exynos5 dtsi files you already have in arm32? I suspect that there is a
> > significant overlap.
> 
> Currently, 32-bit Exynos5 SoC (which is included in arch/arm/boot/dts)
> didn't support the Cortex-A53/A57 and PSCI.
> 
> The 32-bit Exynos5 SoC support the Coretex-A7 or A15 and big.LITTLE Exynos5 SoC
> use the MCPM (Multi-Cluster PM) driver for secondary cpu on/off instead of PSCI.
> 

Yes, I understand that. What I meant is sharing the nodes that are identical
between e.g. all exynos54xx by using a common .dtsi file that can be included
by 5420, 5433 and 5440.

	Arnd
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