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 19:17:48 +0300
From:   Baruch Siach <baruch@...s.co.il>
To:     tinywrkb <tinywrkb@...il.com>
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        Fabio Estevam <festevam@...il.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Russell King <linux@...linux.org.uk>,
        open list <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: dts: imx6dl: SolidRun: add phy node with 100Mb/s
 max-speed

Hi tinywrkb,

On Tue, Sep 10, 2019 at 06:55:07PM +0300, tinywrkb 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.

According to the hardware designer, Rabeeh Khoury, there is not such 
limitation in the Cubox-i carrier magnetics.

> Since commit 5502b218e001 ("net: phy: use phy_resolve_aneg_linkmode in
> genphy_read_status") ethernet is broken on Cubox-i Solo/DualLite devices.

Does revert of 5502b218e001 fixes your issue?

> 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>

You must use your real name in sign-off.

> ---
> 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>;
> +};

Where is the ethphy lable defined? Have you build tested this patch?

> 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 {

baruch

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