linux-kernel - Re: [PATCH net-next 07/15] mfd: core: add ability for cells to probe on a custom parent OF node

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Message-ID: <20260109095801.GD1118061@google.com>
Date: Fri, 9 Jan 2026 09:58:01 +0000
From: Lee Jones <lee@...nel.org>
To: Andrew Lunn <andrew@...n.ch>
Cc: Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org,
	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>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 07/15] mfd: core: add ability for cells to probe
 on a custom parent OF node

On Wed, 17 Dec 2025, Andrew Lunn wrote:

> > > Name         Description                                         Start      End
> > > SWITCH       Ethernet Switch Subsystem                           0x000000   0x3ffffc
> > > 100BASE-T1   Internal MDIO bus for 100BASE-T1 PHY (port 5 - 10)  0x704000   0x704ffc
> > > SGMII1       SGMII Port 1                                        0x705000   0x705ffc
> > > SGMII2       SGMII Port 2                                        0x706000   0x706ffc
> > > SGMII3       SGMII Port 3                                        0x707000   0x707ffc
> > > SGMII4       SGMII Port 4                                        0x708000   0x708ffc
> > > 100BASE-TX   Internal MDIO bus for 100BASE-TX PHY                0x709000   0x709ffc
> > 
> > All in drivers/net.
> 
> I've not been following this conversation too much, but i would like
> to point out that what you find in drivers/net is not a uniform set of
> drivers, but a collection of different driver types.
> 
> SWITCH might belong on drivers/net/dsa
> 100BASE-T1 might belong on drivers/net/mdio
> SGMIIX might belong in drivers/net/pcs
> 100BASE-TX might belong in drivers/net/mdio
> 
> I also expect those T1 and TX PHYs have drivers in drivers/net/phy,
> but they are not memory mapped, so not on your list.
> 
> Each driver can probe independently, registering with different parts
> of the net core. And then the switch driver will link all the parts
> together using phandles.
> 
> Saying that all the sub drivers are in drivers/net seems an odd
> argument it is not an MFD.

Okay, I'm convinced.  Thanks for the additional context.

-- 
Lee Jones [李琼斯]