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net: phy: dp83867: Add documentation for optional impedance control 

Add documention of ti,min-output-impedance and ti,max-output-impedance
which can be used to correct MAC impedance mismatch using phy extended
registers.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mugunthan V N 2016-10-18 16:50:17 +05:30 committed by David S. Miller
parent 403f0727cb
commit d6081de7e0
1 changed files with 12 additions and 0 deletions
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Documentation/devicetree/bindings/net/ti,dp83867.txt
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@ -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