linux-kernel - [PATCH 2/3] dt-bindings: net: fsl,gianfar-mdio: Update information about TBI

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Message-Id: <20250220-gianfar-yaml-v1-2-0ba97fd1ef92@posteo.net>
Date: Thu, 20 Feb 2025 18:29:22 +0100
From: J. Neuschäfer via B4 Relay <devnull+j.ne.posteo.net@...nel.org>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Claudiu Manoil <claudiu.manoil@....com>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 J. Neuschäfer <j.ne@...teo.net>
Subject: [PATCH 2/3] dt-bindings: net: fsl,gianfar-mdio: Update information
 about TBI

From: "J. Neuschäfer" <j.ne@...teo.net>

When this binding was originally written, all known TSEC Ethernet
controllers had a Ten-Bit Interface (TBI). However, some datasheets such
as for the MPC8315E suggest that this is not universally true:

  The eTSECs do not support TBI, GMII, and FIFO operating modes, so all
  references to these interfaces and features should be ignored for this
  device.

Signed-off-by: J. Neuschäfer <j.ne@...teo.net>
---
 Documentation/devicetree/bindings/net/fsl,gianfar-mdio.yaml | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/fsl,gianfar-mdio.yaml b/Documentation/devicetree/bindings/net/fsl,gianfar-mdio.yaml
index 2dade7f48c366b7f5c7408e1f7de1a6f5fc80787..0d2605512c4711a4dcb77620b94ea77a71b45fa8 100644
--- a/Documentation/devicetree/bindings/net/fsl,gianfar-mdio.yaml
+++ b/Documentation/devicetree/bindings/net/fsl,gianfar-mdio.yaml
@@ -11,13 +11,12 @@ description:
   connected. For each device that exists on this bus, a child node should be
   created.

-  As of this writing, every TSEC is associated with an internal Ten-Bit
-  Interface (TBI) PHY. This PHY is accessed through the local MDIO bus. These
-  buses are defined similarly to the mdio buses, except they are compatible
-  with "fsl,gianfar-tbi". The TBI PHYs underneath them are similar to normal
-  PHYs, but the reg property is considered instructive, rather than
-  descriptive. The reg property should be chosen so it doesn't interfere with
-  other PHYs on the bus.
+  Some TSECs are associated with an internal Ten-Bit Interface (TBI) PHY. This
+  PHY is accessed through the local MDIO bus. These buses are defined similarly
+  to the mdio buses, except they are compatible with "fsl,gianfar-tbi". The TBI
+  PHYs underneath them are similar to normal PHYs, but the reg property is
+  considered instructive, rather than descriptive. The reg property should be
+  chosen so it doesn't interfere with other PHYs on the bus.

 maintainers:
   - J. Neuschäfer <j.ne@...teo.net>

-- 
2.48.0.rc1.219.gb6b6757d772