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SubjectRe: [PATCH net-next v2 3/4] dt-bindings: net: Add RGMII internal delay for DP83869
> 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

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