linux-kernel - Re: [PATCH net-next 5/6] arm64: dts: marvell: mcbin: enable the fourth network interface

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Date:   Wed, 27 Dec 2017 22:24:01 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Antoine Tenart <antoine.tenart@...e-electrons.com>
Cc:     davem@...emloft.net, kishon@...com, andrew@...n.ch,
        jason@...edaemon.net, sebastian.hesselbarth@...il.com,
        gregory.clement@...e-electrons.com, mw@...ihalf.com,
        stefanc@...vell.com, ymarkman@...vell.com,
        thomas.petazzoni@...e-electrons.com,
        miquel.raynal@...e-electrons.com, nadavh@...vell.com,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 5/6] arm64: dts: marvell: mcbin: enable the
 fourth network interface

On Wed, Dec 27, 2017 at 11:14:45PM +0100, Antoine Tenart wrote:
> This patch enables the fourth network interface on the Marvell
> Macchiatobin. It is configured in the 2500Base-X PHY mode.
> 
> Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
> ---
>  arch/arm64/boot/dts/marvell/armada-8040-mcbin.dts | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dts b/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dts
> index b3350827ee55..c51efd511324 100644
> --- a/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dts
> +++ b/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dts
> @@ -279,6 +279,14 @@
>  	phys = <&cps_comphy0 1>;
>  };
>  
> +&cps_eth2 {
> +	/* CPS Lane 5 */
> +	status = "okay";
> +	phy-mode = "2500base-x";
> +	/* Generic PHY, providing serdes lanes */
> +	phys = <&cps_comphy5 2>;
> +};
> +

This is wrong.  This lane is connected to a SFP cage which can support
more than just 2500base-X.  Tying it in this way to 2500base-X means
that this port does not support conenctions at 1000base-X, despite
that's one of the most popular and more standardised speeds.

So, I feel I have to NAK this patch in its current form.

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