linux-kernel - Re: [PATCH net] net: broadcom: Imply BROADCOM

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Message-ID: <CAMuHMdVKAjh1TyNOFdNP_zXy8RNU8kD-Saoqha+wjcrR0v5YvQ@mail.gmail.com>
Date:   Sun, 10 May 2020 12:02:18 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Stefan Wahren <wahrenst@....net>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tal Gilboa <talgi@...lanox.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Andy Gospodarek <gospo@...adcom.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: broadcom: Imply BROADCOM_PHY for BCMGENET

Hi Florian,

On Sat, May 9, 2020 at 7:12 PM Florian Fainelli <f.fainelli@...il.com> wrote:
> On 5/9/2020 12:38 AM, Geert Uytterhoeven wrote:
> > On Sat, May 9, 2020 at 12:32 AM Florian Fainelli <f.fainelli@...il.com> wrote:
> >> The GENET controller on the Raspberry Pi 4 (2711) is typically
> >> interfaced with an external Broadcom PHY via a RGMII electrical
> >> interface. To make sure that delays are properly configured at the PHY
> >> side, ensure that we get a chance to have the dedicated Broadcom PHY
> >> driver (CONFIG_BROADCOM_PHY) enabled for this to happen.
> >
> > I guess it can be interfaced to a different external PHY, too?
>
> Yes, although this has not happened yet to the best of my knowledge.
>
> >
> >> Fixes: 402482a6a78e ("net: bcmgenet: Clear ID_MODE_DIS in EXT_RGMII_OOB_CTRL when not needed")
> >> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> >> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> >
> >> --- a/drivers/net/ethernet/broadcom/Kconfig
> >> +++ b/drivers/net/ethernet/broadcom/Kconfig
> >> @@ -69,6 +69,7 @@ config BCMGENET
> >>          select BCM7XXX_PHY
> >>          select MDIO_BCM_UNIMAC
> >>          select DIMLIB
> >> +       imply BROADCOM_PHY if ARCH_BCM2835
> >
> > Which means support for the BROADCOM_PHY is always included
> > on ARCH_BCM2835, even if a different PHY is used?
>
> It is included by default on  and can be deselected if needed, which is
> exactly what we want here, a sane default, but without the inflexibility
> of "select".

I stand corrected: I can confirm the "imply" no longer selects the target
symbol, but merely changes the default.

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