linux-kernel - Re: [PATCH net-next v2 8/8] dt-bindings: net: sparx5: document RGMII MAC delays

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Message-ID: <20241115092237.gzpat4x6kjipb2x7@DEN-DL-M70577>
Date: Fri, 15 Nov 2024 09:22:37 +0000
From: Daniel Machon <daniel.machon@...rochip.com>
To: Andrew Lunn <andrew@...n.ch>
CC: <UNGLinuxDriver@...rochip.com>, Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, "Lars
 Povlsen" <lars.povlsen@...rochip.com>, Steen Hegelund
	<Steen.Hegelund@...rochip.com>, Horatiu Vultur
	<horatiu.vultur@...rochip.com>, Russell King <linux@...linux.org.uk>,
	<jacob.e.keller@...el.com>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <devicetree@...r.kernel.org>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH net-next v2 8/8] dt-bindings: net: sparx5: document RGMII
 MAC delays

Hi Andrew,

> > The lan969x switch device supports two RGMII port interfaces that can be
> > configured for MAC level rx and tx delays.
> >
> > Document two new properties {rx,tx}-internal-delay-ps. Make them
> > required properties, if the phy-mode is one of: rgmii, rgmii_id,
> > rgmii-rxid or rgmii-txid. Also specify accepted values.
> 
> This is unusual if you look at other uses of {rt}x-internal-delay-ps.
> It is generally an optional parameter, and states it defaults to 0 if
> missing, and is ignored by the driver if phy-mode is not an rgmii
> variant.

Is unusual bad? :-) I thought that requiring the properties would make
misconfigurations (mismatching phy-modes and MAC delays) more obvious,
as you were forced to specify exactly what combination you want in the
DT.  Maybe not. I can change it,  no problem.

/Daniel


> 
>         Andrew