linux-kernel - Re: [PATCH 1/3] ARM: dts: NSP: Enable SFP on bcm958625hr

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Message-ID: <20180827210916.GP27483@lunn.ch>
Date:   Mon, 27 Aug 2018 23:09:16 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>,
        "maintainer:BROADCOM IPROC ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        rmk+kernel@...linux.org.uk
Subject: Re: [PATCH 1/3] ARM: dts: NSP: Enable SFP on bcm958625hr

On Mon, Aug 27, 2018 at 01:52:42PM -0700, Florian Fainelli wrote:
> On 08/27/2018 01:35 PM, Andrew Lunn wrote:
> >> @@ -210,6 +228,17 @@
> >>  			reg = <4>;
> >>  		};
> >>  
> >> +		port@5 {
> >> +			label = "sfp";
> >> +			phy-mode = "sgmii";
> >> +			reg = <5>;
> >> +			sfp = <&sfp>;
> >> +			fixed-link {
> >> +				speed = <1000>;
> >> +				full-duplex;
> >> +			};
> > 
> > Hi Florian
> > 
> > You might want to add a comment about why you are using fixed-link and
> > sgmii, which seems very odd. Is it even correct?
> 
> Probably not, this is kind of left over from before adding the sfp
> phandle, but if I do remove it, and I can see the DSA slave network
> device fail to initialize, likely because we destroy the PHYLINK instance.
> 
> AFAIR, when we talked about this with Russell, I did not see why we had
> to comment out the following:
> 
> diff --git a/net/dsa/slave.c b/net/dsa/slave.c
> index 962c4fd338ba..f3ae16dbf8d8 100644
> --- a/net/dsa/slave.c
> +++ b/net/dsa/slave.c
> @@ -1227,7 +1227,7 @@ static int dsa_slave_phy_setup(struct net_device
> *slave_dev)
>                         netdev_err(slave_dev,
>                                    "failed to connect to port %d: %d\n",
>                                    dp->index, ret);
> -                       phylink_destroy(dp->pl);
> +                       //phylink_destroy(dp->pl);
>                         return ret;
>                 }
>         }
> 
> maybe you know?

Hi Florian

I didn't need anything like this for the mv88e6xxx. I had patches
merged in -rc1 to make SFF work connected to the mv88e6390. The DT
change was not merged, but it is here:

https://patchwork.ozlabs.org/patch/955635/

+					port@9 {
+						reg = <9>;
+						label = "sff2";
+						phy-mode = "sgmii";
+						managed = "in-band-status";
+						sfp = <&sff2>;
+					};

	Andrew