linux-kernel - Re: [net-next RFC PATCH v3 1/4] net: phy: pass PHY driver to .match_phy

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Message-ID: <67e55d92.050a0220.2fa7e9.5d6b@mx.google.com>
Date: Thu, 27 Mar 2025 15:15:44 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Marek Behún <kabel@...nel.org>,
	Eric Woudstra <ericwouds@...il.com>,
	Daniel Golle <daniel@...rotopia.org>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next RFC PATCH v3 1/4] net: phy: pass PHY driver to
 .match_phy_device OP

On Thu, Mar 27, 2025 at 11:07:16AM +0000, Russell King (Oracle) wrote:
> On Thu, Mar 27, 2025 at 12:35:01AM +0100, Christian Marangi wrote:
> > Pass PHY driver pointer to .match_phy_device OP in addition to phydev.
> > Having access to the PHY driver struct might be useful to check the
> > PHY ID of the driver is being matched for in case the PHY ID scanned in
> > the phydev is not consistent.
> > 
> > A scenario for this is a PHY that change PHY ID after a firmware is
> > loaded, in such case, the PHY ID stored in PHY device struct is not
> > valid anymore and PHY will manually scan the ID in the match_phy_device
> > function.
> > 
> > Having the PHY driver info is also useful for those PHY driver that
> > implement multiple simple .match_phy_device OP to match specific MMD PHY
> > ID. With this extra info if the parsing logic is the same, the matching
> > function can be generalized by using the phy_id in the PHY driver
> > instead of hardcoding.
> > 
> > Suggested-by: Russell King (Oracle) <linux@...linux.org.uk>
> 
> Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> 
> Please also update the email address in the suggested-by to match the
> one in my reviewed-by for the next resend.
> 
> Thanks!
>

kernel test robot made me aware that this cause error with
nxp-c45-tja11xx. I was on an old net-next branch and didn't notice the
""recent"" changes to macsec support. I'm updating this and keeping the
reviewed-by tag, hope it's OK.

Also adding the simplify commit as suggested that recive the
match_phy_device.

-- 
	Ansuel