linux-kernel - Re: [PATCH net-next 1/3] dt-bindings: net: tja11xx: use reverse-mode to instead of rmii-refclk-in

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Message-ID: <dba3139c-8224-4515-9147-6ba97c36909d@lunn.ch>
Date: Fri, 16 Aug 2024 04:32:59 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Wei Fang <wei.fang@....com>
Cc: "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>,
	"robh@...nel.org" <robh@...nel.org>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	"f.fainelli@...il.com" <f.fainelli@...il.com>,
	"hkallweit1@...il.com" <hkallweit1@...il.com>,
	"linux@...linux.org.uk" <linux@...linux.org.uk>,
	"Andrei Botila (OSS)" <andrei.botila@....nxp.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/3] dt-bindings: net: tja11xx: use reverse-mode
 to instead of rmii-refclk-in

> According to the commit message c858d436be8b ("net: phy: introduce
> PHY_INTERFACE_MODE_REVRMII"), my understanding is that
> PHY_INTERFACE_MODE_REVRMII and PHY_INTERFACE_MODE_REVMII
> are used for MAC to MAC connections, which means the MAC behaves
> link an RMII/MII PHY. For the MAC to PHY connection, I think these two
> macros are not applicable.

In MAC to MAC connections, REVRMII means that end plays the role of a
PHY, even though it is a MAC.

What is actually happening when you use these properties/register
setting on the PHY?  It is playing the role of a MAC? In order to have
a working link, do you need to tell the MAC to play the role of the
PHY?

	Andrew