netdev - Re: [PATCH] dt-bindings: net: renesas,ethertsn: Add bindings for Ethernet TSN

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Date: Tue, 21 Nov 2023 20:53:54 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	devicetree@...r.kernel.org, netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: net: renesas,ethertsn: Add bindings for
 Ethernet TSN

> > > +  renesas,rx-internal-delay:
> > > +    type: boolean
> > > +    description:
> > > +      Enable internal Rx clock delay, typically 1.8ns.
> > 
> > Why this is bool, not delay in ns?
> 
> The TSN is only capable of enabling or disable internal delays, not set 
> how long the delay is. The documentation states that the delay depends 
> on the electronic characteristics of the particular board, but states 
> that they typically are 1.8ns for Rx and 2.0ns for Tx.

Do you have a board that actually requires this?

In general, we try to have the PHY add the delay, not the MAC. So i
would start with hard coding the delay to 0ns, and only implement
these properties if you have a board where the PHY cannot add the
delay.

	Andrew