Re: [PATCH] ARM: dts: imx6dl: SolidRun: add phy node with 100Mb/s max-speed

[Fabio Estevam]

Adding Jon and Baruch

On Tue, Sep 10, 2019 at 12:55 PM tinywrkb <tinywrkb@xxxxxxxxx> wrote:
>
> Cubox-i Solo/DualLite carrier board has 100Mb/s magnetics while the
> Atheros AR8035 PHY on the MicroSoM v1.3 CPU module is a 1GbE PHY device.
>
> Since commit 5502b218e001 ("net: phy: use phy_resolve_aneg_linkmode in
> genphy_read_status") ethernet is broken on Cubox-i Solo/DualLite devices.
>
> This adds a phy node to the MicroSoM DTS and a 100Mb/s max-speed limit
> to the Cubox-i Solo/DualLite carrier DTS.
>
> Signed-off-by: tinywrkb <tinywrkb@xxxxxxxxx>
> ---
> This patch fixes ethernet on my Cubox-i2-300-D which is limited to 100Mb/s,
> afaik due to the carrier board  magnetics, and was since commit 5502b218e001
> ("net: phy: use phy_resolve_aneg_linkmode in genphy_read_status")
>
> The AR8035 PHY on the CPU module reports to the driver as 1GbE capable
> via MII_BSMR's BMSR_ESTATEN status bit, the auto-negotiation sets the
> speed at 1GbE while the carrier board can't support it.
> Same behavior with the generic phy_device and the at803x drivers.
>
> While the PHY is on the CPU module board I added the max-speed limit to
> the cubox-i carrier DTS as I suspect that if the Solo or DualLite v1.3
> MicroSoM will be connected to a 1GbE capable carrier board then it would
> work correctly with 1GbE.
>
> I can confirm that this commit doesn't break networking on the my
> Cubox-i4Pro Quad (i4P-300-D) with it's 1GbE capable carrier board, and
> was tested separately with the generic phy_device and at803x drivers.
>
>  arch/arm/boot/dts/imx6dl-cubox-i.dts  | 4 ++++
>  arch/arm/boot/dts/imx6qdl-sr-som.dtsi | 9 +++++++++
>  2 files changed, 13 insertions(+)
>
> diff --git a/arch/arm/boot/dts/imx6dl-cubox-i.dts b/arch/arm/boot/dts/imx6dl-cubox-i.dts
> index 2b1b3e193f53..cfc82513c78c 100644
> --- a/arch/arm/boot/dts/imx6dl-cubox-i.dts
> +++ b/arch/arm/boot/dts/imx6dl-cubox-i.dts
> @@ -49,3 +49,7 @@
>         model = "SolidRun Cubox-i Solo/DualLite";
>         compatible = "solidrun,cubox-i/dl", "fsl,imx6dl";
>  };
> +
> +&ethphy {
> +       max-speed = <100>;
> +};
> diff --git a/arch/arm/boot/dts/imx6qdl-sr-som.dtsi b/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
> index 6d7f6b9035bc..969bc96c3f99 100644
> --- a/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
> @@ -57,6 +57,15 @@
>         phy-reset-duration = <2>;
>         phy-reset-gpios = <&gpio4 15 GPIO_ACTIVE_LOW>;
>         status = "okay";
> +       phy-handle = <&ethphy>;
> +       mdio {
> +               #address-cells = <1>;
> +               #size-cells = <0>;
> +               ethphy: ethernet-phy@0 {
> +                       compatible = "ethernet-phy-ieee802.3-c22";
> +                       reg = <0>;
> +               };
> +       };
>  };
>
>  &iomuxc {
> --
> 2.23.0
>