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dt-bindings: phy: dp83867: Describe how driver behaves w.r.t rgmii delay
Add a note to make it more clear how the driver behaves when "rgmii" vs "rgmii-id", "rgmii-idrx", or "rgmii-idtx" interface modes are selected. Cc: Rob Herring <robh+dt@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Trent Piepho <tpiepho@impinj.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -11,6 +11,14 @@ Required properties:
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- ti,fifo-depth - Transmitt FIFO depth- see dt-bindings/net/ti-dp83867.h
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for applicable values
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Note: If the interface type is PHY_INTERFACE_MODE_RGMII the TX/RX clock delays
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will be left at their default values, as set by the PHY's pin strapping.
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The default strapping will use a delay of 2.00 ns. Thus
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PHY_INTERFACE_MODE_RGMII, by default, does not behave as RGMII with no
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internal delay, but as PHY_INTERFACE_MODE_RGMII_ID. The device tree
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should use "rgmii-id" if internal delays are desired as this may be
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changed in future to cause "rgmii" mode to disable delays.
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Optional property:
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- ti,min-output-impedance - MAC Interface Impedance control to set
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the programmable output impedance to
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