linux-kernel - [PATCH 1/5] dt-bindings: phy: dp83867: Describe how driver behaves w.r.t rgmii delay

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Message-ID: <20190510214550.18657-1-tpiepho@impinj.com>
Date:   Fri, 10 May 2019 21:46:10 +0000
From:   Trent Piepho <tpiepho@...inj.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Trent Piepho <tpiepho@...inj.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH 1/5] dt-bindings: phy: dp83867: Describe how driver behaves
 w.r.t rgmii delay

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@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Signed-off-by: Trent Piepho <tpiepho@...inj.com>
---
 Documentation/devicetree/bindings/net/ti,dp83867.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ti,dp83867.txt b/Documentation/devicetree/bindings/net/ti,dp83867.txt
index 9ef9338aaee1..e97f54aeac77 100644
--- a/Documentation/devicetree/bindings/net/ti,dp83867.txt
+++ b/Documentation/devicetree/bindings/net/ti,dp83867.txt
@@ -11,6 +11,12 @@ 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.
+
 Optional property:
 	- ti,min-output-impedance - MAC Interface Impedance control to set
 				    the programmable output impedance to
-- 
2.14.5