linux-kernel - Re: [PATCH v5 1/9] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC

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Date:	Thu, 5 Mar 2015 12:24:59 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	"kgene@...nel.org" <kgene@...nel.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"arnd@...db.de" <arnd@...db.de>, "olof@...om.net" <olof@...om.net>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	"inki.dae@...sung.com" <inki.dae@...sung.com>,
	"chanho61.park@...sung.com" <chanho61.park@...sung.com>,
	"sw0312.kim@...sung.com" <sw0312.kim@...sung.com>,
	"jh80.chung@...sung.com" <jh80.chung@...sung.com>,
	"ideal.song@...sung.com" <ideal.song@...sung.com>,
	"a.kesavan@...sung.com" <a.kesavan@...sung.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/9] arm64: dts: exynos: Add dts files for 64-bit
 Exynos5433 SoC

On Thu, Mar 05, 2015 at 05:38:23AM +0000, 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

[...]

> +       psci {
> +               compatible = "arm,psci";
> +               method = "smc";
> +               cpu_off = <0x84000002>;
> +               cpu_on = <0xC4000003>;
> +       };

Back at v2 you mentioned that CPU_OFF wasn't working [1].

Do both CPU_ON and CPU_OFF work for all CPUs, including the boot CPU?

I take it CPUs boot at EL2?

[...]

> +               timer {
> +                       compatible = "arm,armv8-timer";
> +                       interrupts = <1 13 0xff04>,
> +                                    <1 14 0xff04>,
> +                                    <1 11 0xff04>,
> +                                    <1 10 0xff04>;
> +               };

The timer node should be moved under the root node. It doesn't live on
the bus; it's a component of the CPU.

Thanks,
Mark.

[1] https://lkml.org/lkml/2014/12/2/413
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