linux-kernel - Re: [PATCH net-next v4 1/4] dt-bindings: net: Add tx and rx internal delays

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Date:   Fri, 29 May 2020 14:24:52 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Rob Herring <robh@...nel.org>
CC:     <andrew@...n.ch>, <f.fainelli@...il.com>, <hkallweit1@...il.com>,
        <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH net-next v4 1/4] dt-bindings: net: Add tx and rx internal
 delays

Rob

On 5/29/20 1:25 PM, Rob Herring wrote:
> On Wed, May 27, 2020 at 11:49:31AM -0500, Dan Murphy wrote:
>> tx-internal-delays and rx-internal-delays are a common setting for RGMII
>> capable devices.
>>
>> These properties are used when the phy-mode or phy-controller is set to
>> rgmii-id, rgmii-rxid or rgmii-txid.  These modes indicate to the
>> controller that the PHY will add the internal delay for the connection.
>>
>> Signed-off-by: Dan Murphy <dmurphy@...com>
>> ---
>>   .../bindings/net/ethernet-controller.yaml          | 14 ++++++++++++++
>>   1 file changed, 14 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/net/ethernet-controller.yaml b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
>> index ac471b60ed6a..70702a4ef5e8 100644
>> --- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml
>> +++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
>> @@ -143,6 +143,20 @@ properties:
>>         Specifies the PHY management type. If auto is set and fixed-link
>>         is not specified, it uses MDIO for management.
>>   
>> +  rx-internal-delay-ps:
>> +    $ref: /schemas/types.yaml#definitions/uint32
>> +    description: |
>> +      RGMII Receive PHY Clock Delay defined in pico seconds.  This is used for
>> +      PHY's that have configurable RX internal delays.  This property is only
>> +      used when the phy-mode or phy-connection-type is rgmii-id or rgmii-rxid.
> Isn't this a property of the phy (this is the controller schema)? Looks
> like we have similar properties already and they go in phy nodes. Would
> be good to have a standard property, but let's be clear where it goes.
>
> We need to add '-ps' as a standard unit suffix (in dt-schema) and then a
> type is not needed here.

This is a PHY specific property.

I will move them.

Dumb question but you can just point me to the manual about how and 
where to add the '-ps' to the dt-schema

Dan


> Rob