linux-kernel - Re: [PATCH 2/3] net: phy: bcm5481x: Implement MII-Lite mode

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Message-ID: <f8662437-58ea-4ae5-8fbc-eb06e22f5a1c@lunn.ch>
Date: Fri, 20 Jun 2025 17:19:59 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Kamil Horák (2N) <kamilh@...s.com>
Cc: florian.fainelli@...adcom.com, bcm-kernel-feedback-list@...adcom.com,
	hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	krzk+dt@...nel.org, conor+dt@...nel.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	robh@...nel.org
Subject: Re: [PATCH 2/3] net: phy: bcm5481x: Implement MII-Lite mode

On Fri, Jun 20, 2025 at 03:44:28PM +0200, Kamil Horák (2N) wrote:
> The Broadcom bcm54810 and bcm54811 PHYs are capable to operate in
> simplified MII mode, without TXER, RXER, CRS and COL signals as defined
> for the MII. While the PHY can be strapped for MII mode, the selection
> between MII and MII-Lite must be done by software.

Please could you say more about what mii-lite is. Rather than adding a
bool DT property, i'm asking myself should we add interface mode for
it?

Is it a mode of its own? MII normally means Fast Ethernet, 100Mbps. Is
that what MII-Lite supports? How does it differ from RMII? Should we
be calling this PHY_INTERFACE_MODE_LMII?

	Andrew