netdev - Re: [PATCH 2/2] dt-bindings: net: dsa: qca8k: Add PORT0_PAD

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Date:   Fri, 17 Jul 2020 21:29:53 +0100
From:   Matthew Hagan <mnhagan88@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>, linux@...linux.org.uk,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        John Crispin <john@...ozen.org>,
        Jonathan McDowell <noodles@...th.li>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: net: dsa: qca8k: Add PORT0_PAD_CTRL
 properties



On 16/07/2020 23:09, Jakub Kicinski wrote:
> On Mon, 13 Jul 2020 21:50:26 +0100 Matthew Hagan wrote:
>> Add names and decriptions of additional PORT0_PAD_CTRL properties.
>>
>> Signed-off-by: Matthew Hagan <mnhagan88@...il.com>
>> ---
>>  Documentation/devicetree/bindings/net/dsa/qca8k.txt | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/net/dsa/qca8k.txt b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
>> index ccbc6d89325d..3d34c4f2e891 100644
>> --- a/Documentation/devicetree/bindings/net/dsa/qca8k.txt
>> +++ b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
>> @@ -13,6 +13,14 @@ Optional properties:
>>  
>>  - reset-gpios: GPIO to be used to reset the whole device
>>  
>> +Optional MAC configuration properties:
>> +
>> +- qca,exchange-mac0-mac6:	If present, internally swaps MAC0 and MAC6.
> 
> Perhaps we can say a little more here?
> 
>From John's patch:
"The switch allows us to swap the internal wirering of the two cpu ports.
For the HW offloading to work the ethernet MAC conencting to the LAN
ports must be wired to cpu port 0. There is HW in the wild that does not
fulfill this requirement. On these boards we need to swap the cpu ports."

This option is somewhat linked to instances where both MAC0 and MAC6 are
used as CPU ports. I may omit this for now since support for this hasn't
been added and MAC0 is hard-coded as the CPU port. The initial intention
here was to cover options commonly set by OpenWrt devices, based upon
their ar8327-initvals, to allow migration to qca8k.


>> +- qca,sgmii-rxclk-falling-edge:	If present, sets receive clock phase to
>> +				falling edge.
>> +- qca,sgmii-txclk-falling-edge:	If present, sets transmit clock phase to
>> +				falling edge.
> 
> These are not something that other vendors may implement and therefore
> something we may want to make generic? Andrew?
> 
>>  Subnodes:
>>  
>>  The integrated switch subnode should be specified according to the binding
> 
Matthew