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@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Signed-off-by: Trent Piepho <tpiepho@xxxxxxxxxx>
---
Notes:
Changes from v1:
Clarify behavior may change to enforce no delay in "rgmii" mode
Documentation/devicetree/bindings/net/ti,dp83867.txt | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/Documentation/devicetree/bindings/net/ti,dp83867.txt b/Documentation/devicetree/bindings/net/ti,dp83867.txt
index 9ef9338aaee1..99b8681bde49 100644
--- a/Documentation/devicetree/bindings/net/ti,dp83867.txt
+++ b/Documentation/devicetree/bindings/net/ti,dp83867.txt
@@ -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
--
2.14.5
