From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Subject: Re: [PATCH v4 2/8] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC Date: Tue, 24 Feb 2015 10:50:47 +0100 Message-ID: <5937606.zM91rlE7sS@wuerfel> References: <1424755011-15999-1-git-send-email-cw00.choi@samsung.com> <19309272.tlWX2xvTnx@wuerfel> <54EC3DE7.7070306@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: <54EC3DE7.7070306@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org To: Chanwoo Choi Cc: kgene@kernel.org, mark.rutland@arm.com, marc.zyngier@arm.com, olof@lixom.net, catalin.marinas@arm.com, will.deacon@arm.com, inki.dae@samsung.com, chanho61.park@samsung.com, sw0312.kim@samsung.com, jh80.chung@samsung.com, ideal.song@samsung.com, a.kesavan@samsung.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org 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