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From:   Chunyan Zhang <zhang.lyra@gmail.com>
Date:   Mon, 9 Mar 2020 16:32:04 +0800
Message-ID: <CAAfSe-spu2oNmfEYt+WQvRQy1bCC0e1MFjbUyBAFzghd5XNBfw@mail.gmail.com>
Subject: Re: [PATCH 1/2] arm64: change ARCH_SPRD Kconfig to tristate
To:     Geert Uytterhoeven <geert@linux-m68k.org>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, Jiri Slaby <jslaby@suse.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Chunyan Zhang <chunyan.zhang@unisoc.com>,
        "open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
        Baolin Wang <baolin.wang7@gmail.com>,
        Orson Zhai <orsonzhai@gmail.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        kernel-team@android.com
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Hi Geert,

On Mon, 9 Mar 2020 at 16:03, Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Chunyan.
>
> On Thu, Mar 5, 2020 at 11:33 AM Chunyan Zhang <zhang.lyra@gmail.com> wrote:
> > From: Chunyan Zhang <chunyan.zhang@unisoc.com>
> >
> > The default value of Kconfig for almost all sprd drivers are the same with
> > ARCH_SPRD, making these drivers built as modules as default would be easier
> > if we can set ARCH_SPRD as 'm', so this patch change ARCH_SPRD to tristate.
> >
> > Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
>
> Can you actually boot a kernel on a Spreadtrum platform when all platform
> and driver support is modular?

Yes, even if all drivers are modular.
But I hope serial can be builtin, then I can have a console to see
kernel output before loading modules.
Also, this's what Google GKI [1] asked :)

Regards,
Chunyan

[1] https://arstechnica.com/gadgets/2019/11/google-outlines-plans-for-mainline-linux-kernel-support-in-android/

>
> > +++ b/arch/arm64/Kconfig.platforms
> > @@ -249,7 +249,7 @@ config ARCH_TEGRA
> >           This enables support for the NVIDIA Tegra SoC family.
> >
> >  config ARCH_SPRD
> > -       bool "Spreadtrum SoC platform"
> > +       tristate "Spreadtrum SoC platform"
> >         help
> >           Support for Spreadtrum ARM based SoCs
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds