From: Mugunthan V N Date: Tue, 18 Oct 2016 11:20:17 +0000 (+0530) Subject: UPSTREAM: net: phy: dp83867: Add documentation for optional impedance control X-Git-Tag: release-20171130_firefly~4^2~501 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d0b81f9d48dccc0c2a97ee12f003bb8eca3fbe2c;p=firefly-linux-kernel-4.4.55.git UPSTREAM: 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 Signed-off-by: David S. Miller (cherry picked from commit d6081de7e011327af089475bb60593423963526a) Change-Id: I5e1f90caff7fee13369302a84d1dac370cb75f5e Signed-off-by: Jacob Chen --- diff --git a/Documentation/devicetree/bindings/net/ti,dp83867.txt b/Documentation/devicetree/bindings/net/ti,dp83867.txt index 58d935b58598..5c90c759b39a 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