linux-kernel - Re: [PATCH net-next v2 1/2] dt-bindings: net: Add documentation for Half duplex support.

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Message-ID: <0c23d883-0a79-ee7c-332c-c6580f8691df@ti.com>
Date:   Tue, 12 Sep 2023 11:25:40 +0530
From:   MD Danish Anwar <danishanwar@...com>
To:     Rob Herring <robh@...nel.org>
CC:     Andrew Lunn <andrew@...n.ch>, Roger Quadros <rogerq@...com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Vignesh Raghavendra <vigneshr@...com>,
        Simon Horman <horms@...nel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <netdev@...r.kernel.org>, <srk@...com>, <r-gunasekaran@...com>,
        Roger Quadros <rogerq@...nel.org>
Subject: Re: [PATCH net-next v2 1/2] dt-bindings: net: Add documentation for
 Half duplex support.

On 11/09/23 22:16, Rob Herring wrote:
> On Mon, Sep 11, 2023 at 11:31:59AM +0530, MD Danish Anwar wrote:
>> In order to support half-duplex operation at 10M and 100M link speeds, the
>> PHY collision detection signal (COL) should be routed to ICSSG
>> GPIO pin (PRGx_PRU0/1_GPI10) so that firmware can detect collision signal
>> and apply the CSMA/CD algorithm applicable for half duplex operation. A DT
>> property, "ti,half-duplex-capable" is introduced for this purpose. If
>> board has PHY COL pin conencted to PRGx_PRU1_GPIO10, this DT property can
>> be added to eth node of ICSSG, MII port to support half duplex operation at
>> that port.
>>
>> Reviewed-by: Roger Quadros <rogerq@...nel.org>
>> Signed-off-by: MD Danish Anwar <danishanwar@...com>
>> ---
>>  Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml b/Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml
>> index 311c570165f9..bba17d4d5874 100644
>> --- a/Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml
>> +++ b/Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml
>> @@ -106,6 +106,13 @@ properties:
>>                phandle to system controller node and register offset
>>                to ICSSG control register for RGMII transmit delay
>>  
>> +          ti,half-duplex-capable:
>> +            type: boolean
>> +            description:
>> +              Enable half duplex operation on ICSSG MII port. This requires
> 
> Still have capable vs. enable confusion. Please reword the description.
> 

Sure Rob, I will change the description to below.

    description:
      Indicates that the PHY output pin (COL) is routed to ICSSG GPIO
      pin (PRGx_PRU0/1_GPIO10) as input and ICSSG MII port is capable
      of half duplex operations.

Please let me know if this looks OK or if any other change is required.

>> +              PHY output pin (COL) to be routed to ICSSG GPIO pin
>> +              (PRGx_PRU0/1_GPIO10) as input.
>> +
>>          required:
>>            - reg
>>      anyOf:
>> -- 
>> 2.34.1
>>

-- 
Thanks and Regards,
Danish