netdev - Re: [net-next,v5] net: ethernet: rtsn: Add support for Renesas Ethernet-TSN

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Date: Mon, 13 May 2024 15:38:18 +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 <netdev@...r.kernel.org>,
	Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [net-next,v5] net: ethernet: rtsn: Add support for Renesas
 Ethernet-TSN

> The PHY never applies the {rx,tx}-internal-delay-ps properties, as
> these are meant for the MAC (cfr. "internal").
> The PHY does apply the "*-skew-ps" properties.
> 
> If you mask any *ID part from the phy_interface_t, you lose the ability
> to let the PHY apply any additional delay.

You should still be able to apply the PHY skews.
{rx,tx}-internal-delay-ps and PHY skews should work independent of the
RGMII modes, since they are meant to be small fine tuning of the
delays, steps of a few 10s of ps.

	Andrew