netdev - Re: [net-next] net: ethernet: rtsn: Add support for Renesas Ethernet-TSN

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Message-ID: <e6e3fbd2-7a6c-4ee4-aaca-4b8164b88cac@lunn.ch>
Date: Fri, 19 Apr 2024 14:56:22 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [net-next] net: ethernet: rtsn: Add support for Renesas
 Ethernet-TSN

> IIRC (from users of RAVB, which have similar delay bits), the issue
> is that some boards require a larger delay than the maximum delay
> supported by the Micrel KSZ9031 PHY (960 ps).  Hence these
> boards need to enable the MAC delay.

Which is fine, just comment in on.

Whoever, some MAC drivers which implement the delay get the phy-mode
passed to the PHY wrong. The board requires rgmii-id, since there is
no extra long clock lines. So i would expect the DT to have
rmgii-id. If the MAC then implements the delays, it then needs to mask
the PHY mode and pass rgmii to the PHY.

	Andrew