Hi Junhao,

I have tried rgmii-id with tx_delay/rx_delay 0x38/0x15, or 0x0/0x0,
or directly removed tx_delay/rx_delay, they all didn't transmit data.

I saw in dwmac-rk.c that when using rgmii-id, the tx_delay/rx_delay
properties in dt are ignored?

When using rgmii-id mode, tx_delay and rx_delay can be removed directly.
But you need to test whether the rx/tx-internal-delay-ps is appropriate.

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2.25.1