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Date:   Sat, 9 May 2020 10:12:52 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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



On 5/9/2020 12:38 AM, Geert Uytterhoeven wrote:
> Hi Florian,
> 
> Thanks for your patch!
> 
> 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".

> 
>>          help
>>            This driver supports the built-in Ethernet MACs found in the
>>            Broadcom BCM7xxx Set Top Box family chipset.
> 
> Gr{oetje,eeting}s,
> 
>                          Geert
> 

-- 
Florian

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