linux-kernel - Re: [PATCH 1/2] arm64: dts: mediatek: mt7622: set PHY address of MT7531 switch to 0x1f

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Date: Mon, 18 Mar 2024 08:38:57 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Arınç ÜNAL <arinc.unal@...nc9.com>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Matthias Brugger
 <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: mithat.guner@...ont.com, erkin.bozoglu@...ont.com,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/2] arm64: dts: mediatek: mt7622: set PHY address of
 MT7531 switch to 0x1f

On 3/18/24 08:26, Arınç ÜNAL wrote:
> On 18.03.2024 16:02, Florian Fainelli wrote:
>>>> Can we call it a pseudo PHY to use a similar terminology as what is 
>>>> done through drivers/net/dsa/{bcm_sf2,b53}*?
>>>>
>>>> This is not a real PHY as in it has no actual transceiver/digital 
>>>> signal processing logic, this is a piece of logic that snoops for 
>>>> MDIO transactions at that specific address and lets you access the 
>>>> switch's internal register as if it was a MDIO device.
>>>
>>> I can get behind calling the switch a psuedo-PHY in the context of MDIO.
>>> However, as described on "22.2.4.5.5 PHYAD (PHY Address)" of "22.2.4.5
>>> Management frame structure" of the active standard IEEE Std 802.3™‐2022,
>>> the field is called "PHY Address". The patch log doesn't give an 
>>> identifier
>>> as to what a switch is in the context of MDIO. Only that it listens on a
>>> certain PHY address which the term complies with IEEE Std 802.3™‐2022.
>>>
>>> So I don't see an improvement to be made on the patch log. Feel free to
>>> elaborate further.
>>
>> I would just s/PHY/MDIO bus address/ since that is simply more 
>> generic, but if it is not written as-is in the spec, then I won't 
>> fight it much more than I already did.
> 
> I'm not sure what you're referring to by spec. Are you asking how specific
> the name of the PHYAD field is described on the standard?

Spec = IEEE Std 802.3-2022 standard, aka the document you are quoting.
-- 
Florian