netdev - Re: [PATCH RFC net-next 0/9] net: stmmac: experimental PCS conversion

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Message-ID: <67535617-92fc-44d4-ba2b-060d0408a5e7@bootlin.com>
Date: Fri, 3 Oct 2025 15:24:32 +0200
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
 Abhishek Chauhan <quic_abchauha@...cinc.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
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 Matthew Gerlach <matthew.gerlach@...era.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
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 Vladimir Oltean <vladimir.oltean@....com>, Yu-Chun Lin <eleanor15x@...il.com>
Subject: Re: [PATCH RFC net-next 0/9] net: stmmac: experimental PCS conversion

Hi Russell,

> Thanks for the offer of testing.
> 
> Do you know how the stmmac core has been synthesized as far as the
> MII interface from it?
> 
> If not, if it's using gmac1000, possibly later cores as well, then
> DMA_HW_FEATURE (or FEATURE0) bits 30:28 should give that information.
> I'd guess GMII, so probably contains 0. The driver doesn't actually
> use these, or even look at them.

When synthesized with Lynx, this reads 0 indeed. On my device there are 
2 instances of socfpga, the other instance doesn't include Lynx and uses 
RGMII, so in that case bits 30:28 read 1.

I hope that helps :)

Maxime