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From:   Duje =?utf-8?B?TWloYW5vdmnEhw==?= <duje.mihanovic@skole.hr>
To:     Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Tony Lindgren <tony@atomide.com>,
        Daniel Mack <daniel@zonque.org>,
        Haojian Zhuang <haojian.zhuang@gmail.com>,
        Robert Jarzmik <robert.jarzmik@free.fr>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>, Leo Yan <leoy@marvell.com>,
        Zhangfei Gao <zhangfei.gao@marvell.com>,
        Lubomir Rintel <lkundrak@v3.sk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Tony Luck <tony.luck@intel.com>,
        "Guilherme G . Piccoli" <gpiccoli@igalia.com>,
        Robin Murphy <robin.murphy@arm.com>
Cc:     linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-gpio@vger.kernel.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org,
        alsa-devel@alsa-project.org, linux-hardening@vger.kernel.org,
        phone-devel@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht,
        Karel Balej <balejk@matfyz.cz>
Subject: Re: [PATCH v7 08/10] arm64: Kconfig.platforms: Add config for Marvell PXA1908
 platform
Date:   Fri, 03 Nov 2023 18:02:31 +0100
Message-ID: <2919185.e9J7NaK4W3@radijator>
In-Reply-To: <ffb08cc2-705a-468e-b6d2-9ce591c08ab4@arm.com>
References: <20231102152033.5511-1-duje.mihanovic@skole.hr>
 <20231102152033.5511-3-duje.mihanovic@skole.hr>
 <ffb08cc2-705a-468e-b6d2-9ce591c08ab4@arm.com>
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Precedence: bulk

On Friday, November 3, 2023 4:34:54 PM CET Robin Murphy wrote:
> On 2023-11-02 3:20 pm, Duje Mihanović wrote:
> > +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.

The SoC can boot without SMMU and PDMA, but not GIC, pinctrl or the arch 
timer. I see that most other SoCs still select drivers and frameworks they 
presumably need for booting, with the exceptions of ARCH_BITMAIN, ARCH_LG1K 
and a couple others. Which of these two options should I go for?

Regards,
Duje