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@aspeedtech.com>
---
 arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts | 20 ++++++++++++++++----
 1 file changed, 16 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 3f2ca9da0be2..a2a1c1dbb830 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts
@@ -123,42 +123,54 @@ ethphy3: ethernet-phy@0 {
 &mac0 {
 	status = "okay";
 
-	phy-mode = "rgmii-rxid";
+	phy-mode = "rgmii-id";
 	phy-handle = <&ethphy0>;
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_rgmii1_default>;
+
+	rx-internal-delay-ps = <0>;
+	tx-internal-delay-ps = <0>;
 };
 
 
 &mac1 {
 	status = "okay";
 
-	phy-mode = "rgmii-rxid";
+	phy-mode = "rgmii-id";
 	phy-handle = <&ethphy1>;
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_rgmii2_default>;
+
+	rx-internal-delay-ps = <0>;
+	tx-internal-delay-ps = <0>;
 };
 
 &mac2 {
 	status = "okay";
 
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-id";
 	phy-handle = <&ethphy2>;
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_rgmii3_default>;
+
+	rx-internal-delay-ps = <0>;
+	tx-internal-delay-ps = <0>;
 };
 
 &mac3 {
 	status = "okay";
 
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-id";
 	phy-handle = <&ethphy3>;
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_rgmii4_default>;
+
+	rx-internal-delay-ps = <0>;
+	tx-internal-delay-ps = <0>;
 };
 
 &emmc_controller {

-- 
2.34.1

On Mon, Mar 02, 2026 at 06:24:32PM +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@aspeedtech.com>
> ---
>  arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts | 20 ++++++++++++++++----
>  1 file changed, 16 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 3f2ca9da0be2..a2a1c1dbb830 100644
> --- a/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts
> +++ b/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts
> @@ -123,42 +123,54 @@ ethphy3: ethernet-phy@0 {
>  &mac0 {
>  	status = "okay";
>  
> -	phy-mode = "rgmii-rxid";
> +	phy-mode = "rgmii-id";
>  	phy-handle = <&ethphy0>;
>  
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_rgmii1_default>;
> +
> +	rx-internal-delay-ps = <0>;
> +	tx-internal-delay-ps = <0>;

In the binding, you said these default to 0. So you don't need them.

It is also odd that rgmii-rxid becomes rmgii-id, yet both delays are
0?

What was the bootloader doing? This is worth a comment in the commit
messages.

	Andrew