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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>
This commit is contained in:
Trent Piepho 2019-05-22 18:43:19 +00:00 committed by David S. Miller
parent 74dd5aa1ed
commit 9c3f3410f5
1 changed files with 8 additions and 0 deletions
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8
Documentation/devicetree/bindings/net/ti,dp83867.txt
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@ -11,6 +11,14 @@ Required properties:
- ti,fifo-depth - Transmitt FIFO depth- see dt-bindings/net/ti-dp83867.h
for applicable values
Note: If the interface type is PHY_INTERFACE_MODE_RGMII the TX/RX clock delays
will be left at their default values, as set by the PHY's pin strapping.
The default strapping will use a delay of 2.00 ns. Thus
PHY_INTERFACE_MODE_RGMII, by default, does not behave as RGMII with no
internal delay, but as PHY_INTERFACE_MODE_RGMII_ID. The device tree
should use "rgmii-id" if internal delays are desired as this may be
changed in future to cause "rgmii" mode to disable delays.
Optional property:
- ti,min-output-impedance - MAC Interface Impedance control to set
the programmable output impedance to