linux-kernel - Re: [PATCH net-next v2 1/2] net: dsa: mt7530-mdio: read PHY address of switch from device tree

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Date: Mon, 15 Apr 2024 08:30:55 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: arinc.unal@...nc9.com, Daniel Golle <daniel@...rotopia.org>,
 DENG Qingfang <dqfext@...il.com>, Sean Wang <sean.wang@...iatek.com>,
 Andrew Lunn <andrew@...n.ch>, 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>
Cc: Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
 mithat.guner@...ont.com, erkin.bozoglu@...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 v2 1/2] net: dsa: mt7530-mdio: read PHY address
 of switch from device tree

On 4/13/2024 11:07 PM, Arınç ÜNAL via B4 Relay wrote:
> From: Arınç ÜNAL <arinc.unal@...nc9.com>
> 
> Read the PHY address the switch listens on from the reg property of the
> switch node on the device tree. This change brings support for MT7530
> switches on boards with such bootstrapping configuration where the switch
> listens on a different PHY address than the hardcoded PHY address on the
> driver, 31.
> 
> As described on the "MT7621 Programming Guide v0.4" document, the MT7530
> switch and its PHYs can be configured to listen on the range of 7-12,
> 15-20, 23-28, and 31 and 0-4 PHY addresses.
> 
> There are operations where the switch PHY registers are used. For the PHY
> address of the control PHY, transform the MT753X_CTRL_PHY_ADDR constant
> into a macro and use it. The PHY address for the control PHY is 0 when the
> switch listens on 31. In any other case, it is one greater than the PHY
> address the switch listens on.
> 
> Reviewed-by: Daniel Golle <daniel@...rotopia.org>
> Tested-by: Daniel Golle <daniel@...rotopia.org>
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>

I would go a step further and name phy_addr switch_mdio_addr, or 
something along those lines to clearly denote this is not a per-port PHY 
address neither a proper PHY device, but we've already had a similar 
discussion before about spelling this out clearly as a "pseudo PHY"....
-- 
Florian