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

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Message-ID: <ded0ee71-dfa5-497e-a579-c212185f23ba@arinc9.com>
Date: Tue, 30 Apr 2024 07:58:08 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Daniel Golle <daniel@...rotopia.org>, Felix Fietkau <nbd@....name>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, DENG Qingfang <dqfext@...il.com>,
 Sean Wang <sean.wang@...iatek.com>, Andrew Lunn <andrew@...n.ch>,
 Florian Fainelli <f.fainelli@...il.com>, Vladimir Oltean
 <olteanv@...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>, devicetree@...r.kernel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net] net: dsa: mt7530: fix impossible MDIO address and
 issue warning

On 4/30/24 02:45, Daniel Golle wrote:
> The MDIO address of the MT7530 and MT7531 switch ICs can be configured
> using bootstrap pins. However, there are only 4 possible options for the
> switch itself: 7, 15, 23 and 31 (ie. only 3 and 4 can be configured, bit
> 0~2 are always 111). Practically all boards known as of today use the
> default setting which is to have the switch respond to address 31, while
> the built-in switch PHYs respond to address 0~4 in this case.

I'm not aware of the MT7531 switch having bootstrap pins to configure the
PHY address. Are you sure this is the case?

Arınç