netdev - Re: MT7621 SoC Traffic Won't Flow on RGMII2 Bus/2nd GMAC

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Date:   Sun, 23 Jan 2022 11:33:04 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     DENG Qingfang <dqfext@...il.com>
Cc:     Luiz Angelo Daros de Luca <luizluca@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        John Crispin <john@...ozen.org>,
        Siddhant Gupta <siddhantgupta416@...il.com>,
        Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        Felix Fietkau <nbd@....name>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Russell King <linux@...linux.org.uk>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        René van Dorst <opensource@...rst.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        netdev <netdev@...r.kernel.org>, linux-mips@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, openwrt-devel@...ts.openwrt.org,
        erkin.bozoglu@...ont.com
Subject: Re: MT7621 SoC Traffic Won't Flow on RGMII2 Bus/2nd GMAC

Hey Deng,

On 23/01/2022 09:51, DENG Qingfang wrote:
> Hi,
> 
> Do you set the ethernet pinmux correctly?
> 
> &ethernet {
>      pinctrl-names = "default";
>      pinctrl-0 = <&rgmii1_pins &rgmii2_pins &mdio_pins>;
> };

This fixed it! We did have &rgmii2_pins on the gmac1 node (it was 
originally on external_phy) so we never thought to investigate the 
pinctrl configuration further! Turns out &rgmii2_pins needs to be 
defined on the ethernet node instead.

I'll send a patch to address this on mt7621.dtsi.

You saved us a bunch of time, thank you very much!

Cheers.
Arınç