linux-kernel - Re: [PATCH net-next 2/2] net: phy: broadcom: add 1000Base-X support for BCM54616S

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Date:   Thu, 1 Aug 2019 05:07:22 +0000
From:   Tao Ren <taoren@...com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     Vladimir Oltean <olteanv@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Arun Parameswaran <arun.parameswaran@...adcom.com>,
        Justin Chen <justinpopo6@...il.com>,
        netdev <netdev@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Andrew Jeffery <andrew@...id.au>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH net-next 2/2] net: phy: broadcom: add 1000Base-X support
 for BCM54616S

On 7/30/19 10:55 PM, Tao Ren wrote:
> On 7/30/19 7:34 PM, Andrew Lunn wrote:
>>> Hi Andrew,
>>>
>>> The BCM54616S PHY on my machine is connected to a BCM5396 switch chip over backplane (1000Base-KX).
>>
>> Ah, that is different. So the board is using it for RGMII to 1000Base-KX?
>>
>> phy-mode is about the MAC-PHY link. So in this case RGMII.
> 
> Yes. It's RGMII to 1000Base-KX.
> 
>> There is no DT way to configure the PHY-Switch link. However, it
>> sounds like you have the PHY strapped so it is doing 1000BaseX on the
>> PHY-Switch link. So do you actually need to configure this?
> 
> The PHY is strapped in RGMII-Fiber Mode (the term used in datasheet), but besides 1000BaseX, 100Base-FX is also supported in this mode.
> The datasheet doesn't say which link type (1000BaseX or 100Base-FX) is active after reset and I cannot find a way to auto-detect the link type, either.

I found bit 0 of 100-FX control register can be used to detect PHY-switch link type (means DT is not needed). Will run more testing and send out v2 patch soon. Thank you all for the input and help.


Cheers,

Tao