linux-kernel - Re: [PATCH 3/4] arm64: dts: socfpga: agilex5: enable gmac2 on the Agilex5 dev kit

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Message-ID: <8b7f0946-4c95-465a-a462-48fa9887aade@lunn.ch>
Date: Tue, 15 Jul 2025 00:57:53 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Matthew Gerlach <matthew.gerlach@...era.com>
Cc: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, mcoquelin.stm32@...il.com,
	alexandre.torgue@...s.st.com, dinguyen@...nel.org,
	maxime.chevallier@...tlin.com, richardcochran@...il.com,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] arm64: dts: socfpga: agilex5: enable gmac2 on the
 Agilex5 dev kit

> Currently the
> driver, drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c, and its
> bindings, Documentation/devicetree/bindings/net/altr,socfpga-stmmac.yaml,
> allow all rgmii phy-modes.

There is nothing unusual about allowing all four RGMII modes. Somebody
might design a board with the 2ns delay via extra long clocks lines,
or some other form of delay lines. Such a board would need 'rgmii',
and they do exist, a board like this was added this cycle. There is
one rather odd board with a DT file which has extra long clock line
for TX, but not RX! That needs rgmii-rxid. The majority of boards
don't have any delays on the PCB, so need 'rgmii-id'.

	Andrew