linux-kernel - RE: [PATCH v3 net-next 1/3] net: enetc: set the external PHY address in IERB for port MDIO usage

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Message-ID:
 <GV2PR04MB1174077D4C8E65E3C6D78CD9F96D7A@GV2PR04MB11740.eurprd04.prod.outlook.com>
Date: Wed, 19 Nov 2025 15:20:06 +0000
From: Claudiu Manoil <claudiu.manoil@....com>
To: Wei Fang <wei.fang@....com>, Vladimir Oltean <vladimir.oltean@....com>,
	Clark Wang <xiaoning.wang@....com>, "andrew+netdev@...n.ch"
	<andrew+netdev@...n.ch>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>
CC: Aziz Sellami <aziz.sellami@....com>, "imx@...ts.linux.dev"
	<imx@...ts.linux.dev>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 net-next 1/3] net: enetc: set the external PHY address
 in IERB for port MDIO usage

> -----Original Message-----
> From: Wei Fang <wei.fang@....com>
> Sent: Wednesday, November 19, 2025 12:26 PM
[...]
> Subject: [PATCH v3 net-next 1/3] net: enetc: set the external PHY address in
> IERB for port MDIO usage
> 
> The ENETC supports managing its own external PHY through its port MDIO
> functionality. To use this function, the PHY address needs be set in the
> corresponding LaBCR register in the Integrated Endpoint Register Block
> (IERB), which is used for pre-boot initialization of NETC PCIe functions.
> The port MDIO can only work properly when the PHY address accessed by the
> port MDIO matches the corresponding LaBCR[MDIO_PHYAD_PRTAD] value.
> 
> Because the ENETC driver only registers the MDIO bus (port MDIO bus) when
> it detects an MDIO child node in its node, similarly, the netc-blk-ctrl
> driver only resolves the PHY address and sets it in the corresponding
> LaBCR when it detects an MDIO child node in the ENETC node.
> 
> Co-developed-by: Aziz Sellami <aziz.sellami@....com>
> Signed-off-by: Aziz Sellami <aziz.sellami@....com>
> Signed-off-by: Wei Fang <wei.fang@....com>
> ---

Reviewed-by: Claudiu Manoil <claudiu.manoil@....com>