linux-kernel - Re: [PATCH net-next v2 5/7] net: dsa: mt7530: Add the support of MT7531 switch

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Message-ID: <CAJsYDVJM3A_5Fpp8ube-gOi-Nn-itf0MW6ePL0wM16_k67+x6g@mail.gmail.com>
Date:   Thu, 20 Aug 2020 23:29:45 +0800
From:   Chuanhong Guo <gch981213@...il.com>
To:     René van Dorst <opensource@...rst.com>
Cc:     Landen Chao <landen.chao@...iatek.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        vivien.didelot@...oirfairelinux.com,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, netdev <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "David S. Miller" <davem@...emloft.net>,
        Sean Wang <Sean.Wang@...iatek.com>, frank-w@...lic-files.de,
        DENG Qingfang <dqfext@...il.com>
Subject: Re: [PATCH net-next v2 5/7] net: dsa: mt7530: Add the support of
 MT7531 switch

Hi!

On Thu, Aug 20, 2020 at 7:55 AM René van Dorst <opensource@...rst.com> wrote:
>
> With the current mainline code [1], the dsa code tries to detect how the MAC5
> is used. All the three modes are supported. MAC5 -> PHY0, MAC5 ->
> PHY4, MAC5 ->
> EXTERNAL PHY and MAC5 to external MAC.
>
> When MAC5 is a DSA port it skips settings the delay settings. See [2].
>
> Maybe you can use a similar concept.

Current detection relies on an incorrect assumption that mt753x switch
is always used with mtk_eth_soc. It's a really hacky solution to use
dt properties that don't belong to this switch at all and I think this
approach should not be followed further by future code.
The usage of mac5 should be explicitly defined as a dt property
under mt753x node.
-- 
Regards,
Chuanhong Guo