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

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@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Trent Piepho <tpiepho@impinj.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


             reply	other threads:[~2019-05-10 21:46 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-10 21:46 Trent Piepho [this message]
2019-05-10 21:46 ` [PATCH 2/5] dt-bindings: phy: dp83867: Add documentation for disabling clock output Trent Piepho
2019-05-10 21:46 ` [PATCH 3/5] net: phy: dp83867: Add ability to disable output clock Trent Piepho
2019-05-10 21:46 ` [PATCH 4/5] net: phy: dp83867: Disable tx/rx delay when not configured Trent Piepho
2019-05-10 21:46 ` [PATCH 5/5] net: phy: dp83867: Use unsigned variables to store unsigned properties Trent Piepho
2019-05-11 10:41   ` Heiner Kallweit
2019-05-11 12:32     ` Heiner Kallweit
2019-05-13 19:58       ` Trent Piepho
2019-05-13 20:12         ` Heiner Kallweit
2019-05-13 20:46           ` Andrew Lunn
2019-05-13 21:26             ` Trent Piepho
2019-05-13 21:43               ` Andrew Lunn
2019-05-14 15:37                 ` Trent Piepho

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