Re: [PATCH v4 2/2] arm64: dts: rockchip: Add rk3576 evb2 board

Andrew Lunn
2026-01-22T02:39:45Z

On Thu, Jan 22, 2026 at 09:41:19AM +0800, Chaoyi Chen wrote:
> Hi Andrew,
>
> On 1/21/2026 9:15 PM, Andrew Lunn wrote:
> >> +&mdio0 {
> >> + rgmii_phy0: ethernet-phy@1 {
> >> + compatible = "ethernet-phy-ieee802.3-c22";
> >> + reg = <0x1>;
> >> + pinctrl-names = "default";
> >> + pinctrl-0 = <&rgmii_phy0_rst>;
> >> + reset-assert-us = <20000>;
> >> + reset-deassert-us = <100000>;
> >> + reset-gpios = <&gpio3 RK_PD3 GPIO_ACTIVE_LOW>;
> >> + tx-internal-delay-ps = <1900>;
> >
> > What PHY is this? Does it actually implement this property?
> >
> > It is also close to the 2000ps default. Have you put the board in an
> > environment chamber and run tests at -20C to +70C to see if it will
> > work with the default 2000ps?
> >
>
> It is MotorComm yt8xxx PHY. I chose 1950 here because I find that
> the MotorComm PHY binding only offer the options of 1950 or 2100.

Without the property it should default to something near to 2000. Most
MAC/PHY pairs should work without this property, if the board is
designed correctly. So i suggest you only have a tx-internal-delay-ps
if it is required.

Andrew