TDA4AL-Q1: How do I modify the latency of RGMI

The above description is wrong, what we need to modify should be the delay of RGMII.

Hi,

On the SoC, you can only set the internal transmit delay inside the SoC for RGMII. And it is enabled by default. To disable it, you will need to change the phy-mode in the device tree. By default it is "rgmii-rxid", which means that the internal delay provide by phy is for rx only. If you use "rgmii-id" instead of it, it will expect the internal delay from phy.

Then you can manage the delays from phy register space. The way to do that will be dependent upon the phy being used. Please contact the phy manufacturer for this.

Regards,
Tanmay

Hi,

The Ethernet architecture of our current project does not use phy. It uses a mac to mac architecture.

MDIO has been replaced by I2c, and the rest is shown in the figure.

Hi,

What is the other side? Is it another device or is it ethernet switch?

Anyways, the rx-delay for RGMII will have to be compulsorily set on the ln partner side. There is no configuration to set RGMII rx delay on the SoC.

Regards,
Tanmay