netdev - Re: [PATCH net-next 11/14] net: stmmac: do not require snps,ps-speed for SGMII

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Message-ID: <5c5b0dd4-0c08-48f0-bbb8-21afcdfc102e@lunn.ch>
Date: Wed, 15 Oct 2025 23:00:09 +0200
From: Andrew Lunn <andrew@...n.ch>
To: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc: Heiner Kallweit <hkallweit1@...il.com>,
	Abhishek Chauhan <quic_abchauha@...cinc.com>,
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	Yu-Chun Lin <eleanor15x@...il.com>
Subject: Re: [PATCH net-next 11/14] net: stmmac: do not require snps,ps-speed
 for SGMII

On Wed, Oct 15, 2025 at 03:20:53PM +0100, Russell King (Oracle) wrote:
> SGMII mode does not require port-speed to be specified; this only
> switches SGMII to use the MAC configuration register speed settings
> and the actual value is irrelevant when the link comes up.
> 
> As it seems the intention was to support "reverse SGMII" with this
> setting, but the code didn't actually configure that due to a typo,
> the warning and bad DT binding documentation has led people to
> specify snps,ps-speed in their DT files inappropriately.
> 
> If mac_port_sel_speed is zero, then don't complain that the speed
> is invalid, as this means we're using "normal" SGMII.
> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew