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Date:   Tue, 29 Nov 2022 07:49:25 +0100
From:   Andrew Jones <ajones@ventanamicro.com>
To:     Conor Dooley <conor@kernel.org>
Cc:     Heiko =?utf-8?Q?St=C3=BCbner?= <heiko@sntech.de>,
        Samuel Holland <samuel@sholland.org>, palmer@dabbelt.com,
        Chen-Yu Tsai <wens@csie.org>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        linux-sunxi@lists.linux.dev, linux-riscv@lists.infradead.org,
        devicetree@vger.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Jisheng Zhang <jszhang@kernel.org>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Andre Przywara <andre.przywara@arm.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Anup Patel <apatel@ventanamicro.com>,
        Atish Patra <atishp@rivosinc.com>,
        Christian Hewitt <christianshewitt@gmail.com>,
        Conor Dooley <conor.dooley@microchip.com>,
        Guo Ren <guoren@kernel.org>,
        Heinrich Schuchardt <heinrich.schuchardt@canonical.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Stanislav Jakubek <stano.jakubek@gmail.com>
Subject: Re: [PATCH v2 12/12] riscv: defconfig: Enable the Allwinner D1
 platform and drivers
Message-ID: <20221129064925.kjjqrzmi3fm67akt@kamzik>
References: <20221125234656.47306-1-samuel@sholland.org>
 <20221125234656.47306-13-samuel@sholland.org>
 <Y4JBa52o4Yemv/uj@spud>
 <11740765.nUPlyArG6x@diego>
 <6aad3b63-498e-b13a-af49-b5af0d4e721e@kernel.org>
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On Mon, Nov 28, 2022 at 09:17:38PM +0000, Conor Dooley wrote:
> On 28/11/2022 21:11, Heiko St?bner wrote:
> > Am Samstag, 26. November 2022, 17:40:11 CET schrieb Conor Dooley:
> >> On Fri, Nov 25, 2022 at 05:46:56PM -0600, Samuel Holland wrote:
> >>> Now that several D1-based boards are supported, enable the platform in
> >>> our defconfig. Build in the drivers which are necessary to boot, such as
> >>> the pinctrl, MMC, RTC (which provides critical clocks), SPI (for flash),
> >>> and watchdog (which may be left enabled by the bootloader).
> >>
> >> All of that looks good.
> >>
> >>> Other common
> >>> onboard peripherals are enabled as modules.
> >>
> >> This I am not sure about though. I'll leave that to Palmer since I'm
> >> pretty sure it was him that said it, but I thought the plan was only
> >> turning on stuff required to boot to a console & things that are
> >> generally useful rather than enabling modules for everyone's "random"
> >> drivers. Palmer?
> > 
> > Isn't the defconfig meant as a starting point to get working systems
> > with minimal config effort? At least that was always the way to go on arm
> > so far :-) .
> > 
> > So having boot-required drivers built-in with the rest enabled as modules
> > for supported boards will allow people to boot theirs without headaches.
> > 
> > Disabling unneeded drivers if you're starved for storage space in a special
> > project is always easier than hunting down all the drivers to enable for a
> > specific board. 
> 
> I wouldn't mind being able to turn on all the PolarFire SoC stuff and
> yeah, that would be the way that arm64 does it. But I do recall hearing
> that I should not turn stuff on this way, when I initially tried to
> turn stuff on via selects, got a nack and asked if I could do this instead.
> 
> But it may be that I misremember, which is why I appealed to the Higher
> Powers for clarification :)

FWIW, I don't worry too much about modules in defconfig because I always
immediately apply a 'LSMOD=$PWD/L localmodconfig' to it, where the L
file is an lsmod output which only includes modules I need.

Thanks,
drew

> 
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