linux-kernel - [PATCH net-next v3 1/4] dt-bindings: net: ftgmac100: Add delay properties for AST2600

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Message-ID:
 <SEYPR06MB5134B91F5796311498D87BE29DC4A@SEYPR06MB5134.apcprd06.prod.outlook.com>
Date: Tue, 4 Nov 2025 09:54:56 +0000
From: Jacky Chou <jacky_chou@...eedtech.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: 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>, Rob Herring
	<robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>, Po-Yu Chuang <ratbert@...aday-tech.com>, Joel Stanley
	<joel@....id.au>, Andrew Jeffery <andrew@...econstruct.com.au>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-aspeed@...ts.ozlabs.org"
	<linux-aspeed@...ts.ozlabs.org>, "taoren@...a.com" <taoren@...a.com>
Subject: [PATCH net-next v3 1/4] dt-bindings: net: ftgmac100: Add delay
 properties for AST2600

Hi Krzysztof

Thank you for your reply.

> > Create the new compatibles to identify AST2600 MAC0/1 and MAC3/4.
> > Add conditional schema constraints for Aspeed AST2600 MAC controllers:
> > - For "aspeed,ast2600-mac01", require rx/tx-internal-delay-ps properties
> >   with 45ps step.
> > - For "aspeed,ast2600-mac23", require rx/tx-internal-delay-ps properties
> >   with 250ps step.
> 
> That difference does not justify different compatibles. Basically you said they
> have same programming model, just different hardware characteristics, so
> same compatible.
> 

This change was originally based on feedback from a previous review discussion.
At that time, another reviewer suggested introducing separate compatibles for 
MAC0/1 and MAC2/3 on AST2600, since the delay characteristics differ and they 
might not be fully compatible.

Thanks,
Jacky