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

Chanwoo Choi
2015-02-24T09:01:34Z

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.

Thanks,
Chanwoo Choi