linux-kernel - Re: [PATCH 1/2] arm64: change ARCH

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Date:   Tue, 10 Mar 2020 18:13:51 +0800
From:   Orson Zhai <orsonzhai@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Chunyan Zhang <zhang.lyra@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Jiri Slaby <jslaby@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Baolin Wang <baolin.wang7@...il.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH 1/2] arm64: change ARCH_SPRD Kconfig to tristate

On Tue, Mar 10, 2020 at 5:52 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Orson,
>
> On Tue, Mar 10, 2020 at 10:41 AM Orson Zhai <orsonzhai@...il.com> wrote:
> > On Mon, Mar 9, 2020 at 6:32 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > On Mon, Mar 9, 2020 at 9:32 AM Chunyan Zhang <zhang.lyra@...il.com> wrote:
> > > > On Mon, 9 Mar 2020 at 16:03, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > > > On Thu, Mar 5, 2020 at 11:33 AM Chunyan Zhang <zhang.lyra@...il.com> wrote:
> > > > > > From: Chunyan Zhang <chunyan.zhang@...soc.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@...soc.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.
> > >
> > > Cool. No hard dependencies on e.g. regulators that are turned off when
> > > unused?
> > >
> > > > But I hope serial can be builtin, then I can have a console to see
> > > > kernel output before loading modules.
> > >
> > > No dependency on the clock driver?
> > > Oh, I see you have a hack in the serial driver, to assume default
> > > values when the serial port's parent clock is not found.  That may
> > > limit use of the other serial ports, depending on the actual serial
> > > hardware.
> >
> > There is an function named "sprd_uart_is_console()" in the driver
> > code. So the hack could be only applied when the
> > port is identified as console. And other ports might return
> > PROBE_DEFER until the clock is ready.
> >
> > Could it work out of the limitation?
>
> Yes, that could work.  You also have only a single SPRD_DEFAULT_SOURCE_CLK,
> which makes it simple to handle.
> For other SoCs, there may be a variation of possible values, depending on
> SoC and/or board.

Ok, thanks.

-Orson

>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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