linux-kernel - Re: [PATCH V3 17/26] csky: Misc headers

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Message-ID: <CAK8P3a3HTySouXpwd3qbxzKodJgmTF+N_NxPzt5u7erNbkELig@mail.gmail.com>
Date:   Fri, 7 Sep 2018 10:01:03 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Guo Ren <ren_guo@...ky.com>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jason Cooper <jason@...edaemon.net>,
        c-sky_gcc_upstream@...ky.com, gnu-csky@...tor.com,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        wbx@...ibc-ng.org, Greentime Hu <green.hu@...il.com>
Subject: Re: [PATCH V3 17/26] csky: Misc headers

On Fri, Sep 7, 2018 at 7:17 AM Guo Ren <ren_guo@...ky.com> wrote:
>
> On Thu, Sep 06, 2018 at 04:16:30PM +0200, Arnd Bergmann wrote:
> > On Wed, Sep 5, 2018 at 2:08 PM Guo Ren <ren_guo@...ky.com> wrote:
> >
> > > diff --git a/arch/csky/boot/dts/qemu.dts b/arch/csky/boot/dts/qemu.dts
> > > new file mode 100644
> > > index 0000000..d36e4cd
> > > --- /dev/null
> > > +++ b/arch/csky/boot/dts/qemu.dts
> > > @@ -0,0 +1,77 @@
> > > +/dts-v1/;
> > > +/ {
> > > +       compatible = "csky,qemu";
> > > +       #address-cells = <1>;
> > > +       #size-cells = <1>;
> > > +       interrupt-parent = <&intc>;
> >
> > Ideally, qemu would supply a dtb file that matches the current configuration,
> > as we do for instance on the ARM 'virt' machine. This allows you
> > much more flexibility in running all kinds of options, as well as extending
> > qemu later with new features.
> So, I should remove qemu.dts in next version patch?

It's up to you really. If you won't have a version of qemu that can do this
by itself, it may make sense to keep it around for a while. You might
want to include the version of your current qemu port is based on
qemu-2.x but not upstream, you could include a qemu-2.x.dts file
here, and have the future 3.x port provide its own.

      Arnd