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

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Date:   Tue, 10 Sep 2019 17:46:50 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     tinywrkb <tinywrkb@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: imx6dl: SolidRun: add phy node with 100Mb/s
 max-speed

On Tue, Sep 10, 2019 at 06:55:07PM +0300, tinywrkb wrote:
> Cubox-i Solo/DualLite carrier board has 100Mb/s magnetics while the

That statement is false, sorry.  All boards support 1G.

> 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@...il.com>
> ---
> 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
> 
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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