linux-kernel - Re: [PATCH v7 08/10] arm64: Kconfig.platforms: Add config for Marvell PXA1908 platform

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Message-ID: <ffb08cc2-705a-468e-b6d2-9ce591c08ab4@arm.com>
Date:   Fri, 3 Nov 2023 15:34:54 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Duje Mihanović <duje.mihanovic@...le.hr>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Leo Yan <leoy@...vell.com>,
        Zhangfei Gao <zhangfei.gao@...vell.com>,
        Lubomir Rintel <lkundrak@...sk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Tony Luck <tony.luck@...el.com>,
        "Guilherme G . Piccoli" <gpiccoli@...lia.com>
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        alsa-devel@...a-project.org, linux-hardening@...r.kernel.org,
        phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        Karel Balej <balejk@...fyz.cz>
Subject: Re: [PATCH v7 08/10] arm64: Kconfig.platforms: Add config for Marvell
 PXA1908 platform

On 2023-11-02 3:20 pm, Duje Mihanović wrote:
> Add ARCH_MMP configuration option for Marvell PXA1908 SoC.
> 
> Signed-off-by: Duje Mihanović <duje.mihanovic@...le.hr>
> ---
>   arch/arm64/Kconfig.platforms | 11 +++++++++++
>   1 file changed, 11 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
> index 6069120199bb..b417cae42c84 100644
> --- a/arch/arm64/Kconfig.platforms
> +++ b/arch/arm64/Kconfig.platforms
> @@ -89,6 +89,17 @@ config ARCH_BERLIN
>   	help
>   	  This enables support for Marvell Berlin SoC Family
>   
> +config ARCH_MMP
> +	bool "Marvell MMP SoC Family"
> +	select ARM_GIC
> +	select ARM_ARCH_TIMER
> +	select ARM_SMMU

NAK, not only is selecting user-visible symbols generally frowned upon, 
and ignoring their dependencies even worse, but for a multiplatform 
kernel the user may well want this to be a module.

If having the SMMU driver built-in is somehow fundamentally required for 
this platform to boot, that would represent much bigger problems.

Thanks,
Robin.

> +	select MMP_PDMA
> +	select PINCTRL_SINGLE
> +	help
> +	  This enables support for Marvell MMP SoC family, currently
> +	  supporting PXA1908 aka IAP140.
> +
>   config ARCH_BITMAIN
>   	bool "Bitmain SoC Platforms"
>   	help