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Date:   Wed, 20 May 2020 10:45:38 -0700
From:   Florian Fainelli <>
To:     Dan Murphy <>, Andrew Lunn <>
Subject: Re: [PATCH net-next v2 3/4] dt-bindings: net: Add RGMII internal
 delay for DP83869

On 5/20/2020 10:20 AM, Dan Murphy wrote:
> Andrew/Florian
> 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.

Yes they should, and they should have an unit associated with the name.

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