linux-kernel - Re: [PATCH net-next 08/30] net: dsa: mt7530: change p{5,6}_interface to p{5,6}

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Date:   Sun, 4 Jun 2023 14:07:07 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        erkin.bozoglu@...ont.com, mithat.guner@...ont.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next 08/30] net: dsa: mt7530: change p{5,6}_interface
 to p{5,6}_configured

On Sun, Jun 04, 2023 at 03:55:17PM +0300, Vladimir Oltean wrote:
> On Sun, Jun 04, 2023 at 01:18:04PM +0100, Russell King (Oracle) wrote:
> > I don't remember whether Vladimir's firmware validator will fail for
> > mt753x if CPU ports are not fully described, but that would be well
> > worth checking. If it does, then we can be confident that phylink
> > will always be used, and those bypassing calls should not be necessary.
> 
> It does, I've just retested this:
> 
> [    8.469152] mscc_felix 0000:00:00.5: OF node /soc/pcie@...000000/ethernet-switch@0,5/ports/port@4 of CPU port 4 lacks the required "phy-handle", "fixed-link" or "managed" properties
> [    8.494571] mscc_felix 0000:00:00.5: error -EINVAL: Failed to register DSA switch
> [    8.502151] mscc_felix: probe of 0000:00:00.5 failed with error -22

... which isn't listed in dsa_switches_apply_workarounds[], and
neither is mt753x. Thanks.

So, that should be sufficient to know that the CPU port will always
properly described, and thus bypassing phylink in mt753x for the CPU
port should not be necessary.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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