Re: [PATCH] arm64: dts: rockchip: change eth phy mode to rgmii-id for orangepi r1 plus lts

[Tianling Shen <cnsztl@xxxxxxxxx>]

Hi Dragan,

On 2025/1/19 17:54, Dragan Simic wrote:
> Hello Tianling,
>
> Thanks for the patch.  Please, see a comment below.
>
> On 2025-01-19 10:11, Tianling Shen wrote:
> > In general the delay should be added by the PHY instead of the MAC,
> > and this improves network stability on some boards which seem to
> > need different delay.
> >
> > Fixes: 387b3bbac5ea ("arm64: dts: rockchip: Add Xunlong OrangePi R1 
> > Plus LTS")
> > Cc: stable@xxxxxxxxxxxxxxx # 6.6+
> > Signed-off-by: Tianling Shen <cnsztl@xxxxxxxxx>
> > ---
> >  arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus-lts.dts | 3 +--
> >  arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dts     | 1 +
> >  arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dtsi    | 1 -
> >  3 files changed, 2 insertions(+), 3 deletions(-)
> >
> > diff --git
> > a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus-lts.dts
> > b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus-lts.dts
> > index 67c246ad8b8c..ec2ce894da1f 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus-lts.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus-lts.dts
> > @@ -17,8 +17,7 @@ / {
> >
> >  &gmac2io {
> >      phy-handle = <&yt8531c>;
> > -    tx_delay = <0x19>;
> > -    rx_delay = <0x05>;
> > +    phy-mode = "rgmii-id";
>
> Shouldn't the "tx_delay" and "rx_delay" DT parameters be converted
> into the "tx-internal-delay-ps" and "rx-internal-delay-ps" parameters,
> respectively, so the Motorcomm PHY driver can pick them up and
> actually configure the internal PHY delays?

The documentation[1] says "{t,r}x-internal-delay-ps" default to 1950 and 
that value already works fine on my board.

1. 
https://www.kernel.org/doc/Documentation/devicetree/bindings/net/motorcomm%2Cyt8xxx.yaml

Thanks,
Tianling.

> >      status = "okay";
> >
> >      mdio {
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dts
> > b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dts
> > index 324a8e951f7e..846b931e16d2 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dts
> > @@ -15,6 +15,7 @@ / {
> >
> >  &gmac2io {
> >      phy-handle = <&rtl8211e>;
> > +    phy-mode = "rgmii";
> >      tx_delay = <0x24>;
> >      rx_delay = <0x18>;
> >      status = "okay";
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dtsi
> > b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dtsi
> > index 4f193704e5dc..09508e324a28 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dtsi
> > +++ b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dtsi
> > @@ -109,7 +109,6 @@ &gmac2io {
> >      assigned-clocks = <&cru SCLK_MAC2IO>, <&cru SCLK_MAC2IO_EXT>;
> >      assigned-clock-parents = <&gmac_clk>, <&gmac_clk>;
> >      clock_in_out = "input";
> > -    phy-mode = "rgmii";
> >      phy-supply = <&vcc_io>;
> >      pinctrl-0 = <&rgmiim1_pins>;
> >      pinctrl-names = "default";