netdev - Re: [PATCH net-next] net: phy: mscc: Add support for PHY LEDs on VSC8541

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Message-ID: <CA+V-a8uk-9pUrpXF3GDjwuDJBxpASpW8g5pHNBkd44JhF8AEew@mail.gmail.com>
Date: Fri, 7 Nov 2025 18:55:05 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Horatiu Vultur <horatiu.vultur@...rochip.com>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	Vladimir Oltean <vladimir.oltean@....com>, Vadim Fedorenko <vadim.fedorenko@...ux.dev>, 
	Maxime Chevallier <maxime.chevallier@...tlin.com>, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
	Biju Das <biju.das.jz@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH net-next] net: phy: mscc: Add support for PHY LEDs on VSC8541

Hi Andrew,

On Fri, Nov 7, 2025 at 1:14 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> > > > @@ -2343,6 +2532,26 @@ static int vsc85xx_probe(struct phy_device *phydev)
> > > >       if (!vsc8531->stats)
> > > >               return -ENOMEM;
> > > >
> > > > +     phy_id = phydev->drv->phy_id & phydev->drv->phy_id_mask;
> > > > +     if (phy_id == PHY_ID_VSC8541) {
> > >
> > > The VSC8541 has its own probe function, vsc8514_probe(). Why is this
> > > needed?
> > >
> > vsc85xx_probe() is used for other PHYs along with VSC8541 hence this
> > check, vsc8514_probe() is for 8514 PHY.
>
> Ah, sorry. I was looking at 8514, not 8541. So yes, this is needed.
>
> However, i think all the current probe functions could do with some
> cleanup. There is a lot of repeated code. That could all be moved into
> a vsc85xx_probe_common(), and then a vsc8514_probe() added, which uses
> this common function to do most of the work, and then handles LEDs.
>
Certainly the probes can be simplified into a single function. I'll
create a patch for this.

> Also, is the LED handling you are adding here specific to the 8541? If
> you look at the datasheets for the other devices, are any the same?
>
Looking at the below datasheets the LED handlings seem to be the same.
Do you want me to add this for all the PHYs? Note I can only test this
on 8541 PHY only.

VSC8541: https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/VMDS-10496.pdf
VSC8502: https://ww1.microchip.com/downloads/en/DeviceDoc/VSC8502-03_Datasheet_60001742B.pdf
VSC8514: https://ww1.microchip.com/downloads/en/DeviceDoc/VMDS-10446.pdf
VSC8501: https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/VSC8501-03_Datasheet_60001741B.pdf
VSC8504: https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/60001810A.pdf
VSC8530: https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/VMDS-10516.pdf
VSC8584: https://ww1.microchip.com/downloads/en/DeviceDoc/VMDS-10455.pdf
VSC8582: https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/VMDS-10421.pdf
VSC8575: https://ww1.microchip.com/downloads/en/DeviceDoc/VMDS-10457.pdf
VSC8574: https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/60001807A.pdf
VSC8572: https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/60001808A.pdf
VSC8562: https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/VMDS-10475.pdf
VSC8552: https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/60001809A.pdf

Cheers,
Prabhakar