linux-kernel - Re: [PATCH v2 0/2] Add macb support for SiFive FU540-C000

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Message-ID: <CAJ2_jOEdejgb-ryx3og5gzWP7wSw0tp1Enk-pjD2rZqJ4JcO3A@mail.gmail.com>
Date:   Mon, 17 Jun 2019 16:45:44 +0530
From:   Yash Shah <yash.shah@...ive.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>
Cc:     Andreas Schwab <schwab@...e.de>,
        David Miller <davem@...emloft.net>, devicetree@...r.kernel.org,
        netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Petr Štetiar <ynezz@...e.cz>,
        Sachin Ghadi <sachin.ghadi@...ive.com>,
        Sagar Kadam <sagar.kadam@...ive.com>
Subject: Re: [PATCH v2 0/2] Add macb support for SiFive FU540-C000

On Mon, Jun 17, 2019 at 3:58 PM Paul Walmsley <paul.walmsley@...ive.com> wrote:
>
> On Mon, 17 Jun 2019, Yash Shah wrote:
>
> > On Mon, Jun 17, 2019 at 3:28 PM Paul Walmsley <paul.walmsley@...ive.com> wrote:
> >
> > > On Mon, 17 Jun 2019, Andreas Schwab wrote:
> > >
> > > > On Jun 17 2019, Yash Shah <yash.shah@...ive.com> wrote:
> > > >
> > > > > - Add "MACB_SIFIVE_FU540" in Kconfig to support SiFive FU540 in macb
> > > > >   driver. This is needed because on FU540, the macb driver depends on
> > > > >   SiFive GPIO driver.
> > > >
> > > > This of course requires that the GPIO driver is upstreamed first.
> > >
> > > What's the impact of enabling CONFIG_MACB_SIFIVE_FU540 when the GPIO
> > > driver isn't present?  (After modifying the Kconfig "depends" line
> > > appropriately.)
> > >
> > > Looks to me that it shouldn't have an impact unless the DT string is
> > > present, and even then, the impact might simply be that the MACB driver
> > > may not work?
> >
> > Yes, there won't be an impact other than MACB driver not working.
>
> OK.  In that case, there doesn't seem much point to adding the Kconfig
> option.  Could you please post a new version without it?

Sure, will do that.

>
> > In any case, without GPIO driver, PHY won't get reset and the network
> > interface won't come up.
>
> Naturally, in the medium term, we want Linux to handle the reset.  But if
> there's no GPIO driver present, and the bootloader handles the PHY reset
> before the kernel starts, would the network driver work in that case?

Yes, if bootloader handles the PHY reset then the network driver will
work in that case.
I will post a new version without the GPIO driver dependency.

>
>
> - Paul