linux-kernel - Re: [PATCH 2/4] ARM: sunxi: mc-smp: Use DT enable-method for sun9i A80 SMP

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Date:   Fri, 9 Mar 2018 17:50:35 -0600
From:   Rob Herring <robh@...nel.org>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        Mylene Josserand <mylene.josserand@...tlin.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] ARM: sunxi: mc-smp: Use DT enable-method for sun9i
 A80 SMP

On Thu, Mar 08, 2018 at 11:00:10PM +0800, Chen-Yu Tsai wrote:
> Instead of having an early init function check the machine compatible
> and installing multi-cluster SMP support for the A80 if it matches,
> use a new cpu enable-method string. This makes the platform support
> future proof in case anyone manages to add PSCI support.
> 
> The original init code for the SMP support is changed into the
> .prepare_cpus callback in the smp_operations structure. Instead of
> panicing when resources are missing like on some platforms, our code
> merely guards against engaging SMP or CPU hotplug and returns an error.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  Documentation/devicetree/bindings/arm/cpus.txt |  1 +

Reviewed-by: Rob Herring <robh@...nel.org>

>  arch/arm/mach-sunxi/mc_smp.c                   | 21 ++++++++++++++++++++-
>  2 files changed, 21 insertions(+), 1 deletion(-)