linux-kernel - Re: [PATCH net-next v3 3/4] ARM: dts: aspeed: ast2600-evb: Configure RGMII delay for MAC

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Message-ID: <afdd366b-8bf0-40a4-ae02-dfc2ff79011f@lunn.ch>
Date: Tue, 4 Nov 2025 05:00:58 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Jacky Chou <jacky_chou@...eedtech.com>
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, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org, taoren@...a.com
Subject: Re: [PATCH net-next v3 3/4] ARM: dts: aspeed: ast2600-evb: Configure
 RGMII delay for MAC

On Mon, Nov 03, 2025 at 03:39:18PM +0800, Jacky Chou wrote:
> This change sets the rx-internal-delay-ps and tx-internal-delay-ps
> properties to control the RGMII signal delay.
> The phy-mode for MAC0–MAC3 is updated to "rgmii-id" to enable TX/RX
> internal delay on the PHY and disable the corresponding delay
> on the MAC.
> 
> Signed-off-by: Jacky Chou <jacky_chou@...eedtech.com>
> ---
>  arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts | 28 +++++++++++++++++++++----
>  1 file changed, 24 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts b/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts
> index de83c0eb1d6e..a65568e637bd 100644
> --- a/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts
> +++ b/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts
> @@ -121,44 +121,64 @@ ethphy3: ethernet-phy@0 {
>  };
>  
>  &mac0 {
> +	compatible = "aspeed,ast2600-mac01", "aspeed,ast2600-mac", "faraday,ftgmac100";

Is it really compatible to aspeed,ast2600-mac? If a driver binds to
that, not aspeed,ast2600-mac01, doesn't that imply the bootloader
delays are still in use, so phy-mode will be wrong?

I think you should only list aspeed,ast2600-mac01. If somebody uses
this DT blob on an old kernel, then you won't get an ethernet
interface, rather than a not working ethernet interface, which is
probably preferable.

	Andrew