linux-kernel - [net-next PATCH 1/3] net: phy: dp83867: Add documentation for optional impedance control

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Message-ID: <20160720145614.13132-2-mugunthanvnm@ti.com>
Date:	Wed, 20 Jul 2016 20:26:12 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	<netdev@...r.kernel.org>
CC:	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@...linux.org.uk>,
	Florian Fainelli <f.fainelli@...il.com>,
	"David S . Miller" <davem@...emloft.net>,
	Sekhar Nori <nsekhar@...com>, <devicetree@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Mugunthan V N <mugunthanvnm@...com>
Subject: [net-next PATCH 1/3] net: phy: dp83867: Add documentation for optional impedance control

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@...com>
---
 Documentation/devicetree/bindings/net/ti,dp83867.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ti,dp83867.txt b/Documentation/devicetree/bindings/net/ti,dp83867.txt
index 5d21141..531ea3c5 100644
--- a/Documentation/devicetree/bindings/net/ti,dp83867.txt
+++ b/Documentation/devicetree/bindings/net/ti,dp83867.txt
@@ -9,6 +9,13 @@ Required properties:
 	- ti,fifo-depth - Transmitt FIFO depth- see dt-bindings/net/ti-dp83867.h
 		for applicable values
 
+Optional property:
+	- ti,impedance-control - MAC Interface Impedance control to vary the
+				 output impedance with an approximate range
+				 from 35-70 ohms in 32 steps. Value range can
+				 be 0x0 to 0x1f. Lowest impedance value is
+				 0x1f and highest impedance being 0x0.
+
 Default child nodes are standard Ethernet PHY device
 nodes as described in Documentation/devicetree/bindings/net/phy.txt
 
-- 
2.9.2.368.g08bb350