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[v2,1/4] net: phy: dp83867: Add documentation for optional impedance control

Message ID 20161004125607.10569-2-mugunthanvnm@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Mugunthan V N Oct. 4, 2016, 12:56 p.m. UTC 
Add documention of ti,impedance-control which can be used to
correct MAC impedance mismatch using phy extended registers.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
---
 Documentation/devicetree/bindings/net/ti,dp83867.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/Documentation/devicetree/bindings/net/ti,dp83867.txt b/Documentation/devicetree/bindings/net/ti,dp83867.txt
index 5d21141..85bf945 100644
--- a/Documentation/devicetree/bindings/net/ti,dp83867.txt
+++ b/Documentation/devicetree/bindings/net/ti,dp83867.txt
@@ -9,6 +9,18 @@  Required properties:
 	- ti,fifo-depth - Transmitt FIFO depth- see dt-bindings/net/ti-dp83867.h
 		for applicable values
 
+Optional property:
+	- ti,min-output-impedance - MAC Interface Impedance control to set
+				    the programmable output impedance to
+				    minimum value (35 ohms).
+	- ti,max-output-impedance - MAC Interface Impedance control to set
+				    the programmable output impedance to
+				    maximum value (70 ohms).
+
+Note: ti,min-output-impedance and ti,max-output-impedance are mutually
+      exclusive. When both properties are present ti,max-output-impedance
+      takes precedence.
+
 Default child nodes are standard Ethernet PHY device
 nodes as described in Documentation/devicetree/bindings/net/phy.txt