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

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Date:   Mon, 27 Aug 2018 13:52:42 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
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 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?
-- 
Florian