linux-kernel - Re: [PATCH 0/3] ARM: sunxi: Remove A31 and A23/A33 platform SMP code

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Message-ID: <2833034.e9J7NaK4W3@kista>
Date:   Sun, 12 Jun 2022 23:09:07 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     Chen-Yu Tsai <wens@...e.org>, Samuel Holland <samuel@...lland.org>
Cc:     Russell King <linux@...linux.org.uk>,
        Samuel Holland <samuel@...lland.org>,
        Bartosz Dudziak <bartosz.dudziak@...jp.pl>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Luca Weiss <luca@...tu.xyz>, Maxime Ripard <maxime@...no.tech>,
        Rob Herring <robh+dt@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Stephan Gerhold <stephan@...hold.net>,
        Thierry Reding <treding@...dia.com>,
        Vinod Koul <vkoul@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 0/3] ARM: sunxi: Remove A31 and A23/A33 platform SMP code

Dne torek, 31. maj 2022 ob 06:50:35 CEST je Samuel Holland napisal(a):
> This series is preparation for converting the PRCM MFD and legacy clock
> drivers to a CCU clock driver. The platform SMP code references the PRCM
> node to map its MMIO space, which will break when the PRCM node is
> removed/replaced.

Why can't we just leave old platform code? If older dtb file is used, it would 
still work. Actually, isn't trivial to support new CCU binding too, just by 
including new CCU compatible string? IIUC new CCU node will have same address 
as current PRCM node.

Best regards,
Jernej

> 
> Since PSCI has been available for 7+ years, instead of trying to deal
> with the migration, I think it's safe to just delete this code.
> 
> 
> Samuel Holland (3):
>   ARM: sunxi: Remove A31 and A23/A33 platform SMP code
>   ARM: dts: sunxi: Remove obsolete CPU enable methods
>   dt-bindings: arm: Remove obsolete CPU enable methods
> 
>  .../devicetree/bindings/arm/cpus.yaml         |   2 -
>  arch/arm/boot/dts/sun6i-a31.dtsi              |   1 -
>  arch/arm/boot/dts/sun8i-a23-a33.dtsi          |   1 -
>  arch/arm/mach-sunxi/Makefile                  |   1 -
>  arch/arm/mach-sunxi/platsmp.c                 | 194 ------------------
>  5 files changed, 199 deletions(-)
>  delete mode 100644 arch/arm/mach-sunxi/platsmp.c
> 
> -- 
> 2.35.1
> 
>