linux-kernel - Re: [PATCH net v3] net: dsa: mt7530: fix impossible MDIO address and issue warning

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Message-ID: <20240704172154.opqyrv2mfgbxj7ce@skbuf>
Date: Thu, 4 Jul 2024 20:21:54 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: Arınç ÜNAL <arinc.unal@...nc9.com>
Cc: Daniel Golle <daniel@...rotopia.org>, DENG Qingfang <dqfext@...il.com>,
	Sean Wang <sean.wang@...iatek.com>, 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>,
	Landen Chao <Landen.Chao@...iatek.com>,
	Frank Wunderlich <linux@...web.de>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, regressions@...ts.linux.dev
Subject: Re: [PATCH net v3] net: dsa: mt7530: fix impossible MDIO address and
 issue warning

On Wed, Jul 03, 2024 at 10:03:09AM +0300, Arınç ÜNAL wrote:
> Works on standalone MT7530, MT7621's MCM MT7530, and MT7531. From MT7621's
> MCM MT7530:
> 
> [    1.357287] mt7530-mdio mdio-bus:1f: MT7530 adapts as multi-chip module

Why is the device corresponding to the first print located at address 1f,
then 0?

> [    1.364065] mt7530-mdio mdio-bus:00: [Firmware Warn]: impossible switch MDIO address in device tree, assuming 31
> [    1.374303] mt7530-mdio mdio-bus:00: probe with driver mt7530-mdio failed with error -14
> [...]
> [    1.448370] mt7530-mdio mdio-bus:1f: MT7530 adapts as multi-chip module
> [    1.477676] mt7530-mdio mdio-bus:1f: configuring for fixed/rgmii link mode
> [    1.485687] mt7530-mdio mdio-bus:1f: Link is Up - 1Gbps/Full - flow control rx/tx
> [    1.493480] mt7530-mdio mdio-bus:1f: configuring for fixed/trgmii link mode
> [    1.502680] mt7530-mdio mdio-bus:1f lan1 (uninitialized): PHY [mt7530-0:00] driver [MediaTek MT7530 PHY] (irq=17)
> [    1.513620] mt7530-mdio mdio-bus:1f: Link is Up - 1Gbps/Full - flow control rx/tx
> [    1.519671] mt7530-mdio mdio-bus:1f lan2 (uninitialized): PHY [mt7530-0:01] driver [MediaTek MT7530 PHY] (irq=18)
> [    1.533072] mt7530-mdio mdio-bus:1f lan3 (uninitialized): PHY [mt7530-0:02] driver [MediaTek MT7530 PHY] (irq=19)
> [    1.545042] mt7530-mdio mdio-bus:1f lan4 (uninitialized): PHY [mt7530-0:03] driver [MediaTek MT7530 PHY] (irq=20)
> [    1.557031] mt7530-mdio mdio-bus:1f wan (uninitialized): PHY [mt7530-0:04] driver [MediaTek MT7530 PHY] (irq=21)