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Date:   Wed, 20 May 2020 12:20:31 -0500
From:   Dan Murphy <>
To:     Andrew Lunn <>
CC:     <>, <>,
        <>, <>,
        <>, <>
Subject: Re: [PATCH net-next v2 3/4] dt-bindings: net: Add RGMII internal
 delay for DP83869


On 5/20/20 11:43 AM, Andrew Lunn wrote:
>> I am interested in knowing where that is documented.  I want to RTM I
>> grepped for a few different words but came up empty
> Hi Dan
> It probably is not well documented, but one example would be
> Documentation/devicetree/bindings/net/ethernet-controller.yaml
> says:
>        # RX and TX delays are added by the MAC when required
>        - rgmii
>        # RGMII with internal RX and TX delays provided by the PHY,
>        # the MAC should not add the RX or TX delays in this case
>        - rgmii-id
>        # RGMII with internal RX delay provided by the PHY, the MAC
>        # should not add an RX delay in this case
>        - rgmii-rxid
>        # RGMII with internal TX delay provided by the PHY, the MAC
>        # should not add an TX delay in this case
>        Andrew

OKI I read that.  I also looked at a couple other drivers too.

I am wondering if rx-internal-delay and tx-internal-delay should become 
a common property like tx/rx fifo-depth

And properly document how to use it or at least the expectation on use.


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