Re: [PATCH 1/3] arm64: dts: rockchip: Change gmac phy-mode to rgmii-id for rk3576 evb1
From: Andrew Lunn <andrew@lunn.ch>
Date: 2026-01-21 12:56:17
Also in:
linux-arm-kernel, linux-rockchip, lkml
quoted hunk ↗ jump to hunk
@@ -721,6 +719,7 @@ rgmii_phy0: ethernet-phy@1 { reset-assert-us = <20000>; reset-deassert-us = <100000>; reset-gpios = <&gpio2 RK_PB5 GPIO_ACTIVE_LOW>; + tx-internal-delay-ps = <1950>;
The PHY should add 2000ps, as required by the RGMII standard. The
difference is so small there is no need for tx-internal-delay.
In most cases, 'rmgii-id' should be sufficient, unless the PCB is
badly designed.
Andrew