linux-kernel - [RFC PATCH net-next 1/2] dt-bindings: net: Add documentation for Half duplex support.

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Message-ID: <20230830113134.1226970-2-danishanwar@ti.com>
Date:   Wed, 30 Aug 2023 17:01:33 +0530
From:   MD Danish Anwar <danishanwar@...com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vignesh Raghavendra <vigneshr@...com>,
        Roger Quadros <rogerq@...nel.org>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Simon Horman <horms@...nel.org>,
        MD Danish Anwar <danishanwar@...com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <netdev@...r.kernel.org>, <srk@...com>, <r-gunasekaran@...com>
Subject: [RFC PATCH net-next 1/2] dt-bindings: net: Add documentation for Half duplex support.

In order to support half-duplex operation at 10M and 100M link speeds, the
PHY collision detection signal (COL) should be routed to ICSSG
GPIO pin (PRGx_PRU0/1_GPI10) so that firmware can detect collision signal
and apply the CSMA/CD algorithm applicable for half duplex operation. A DT
property, "ti,half-duplex-capable" is introduced for this purpose. If
board has PHY COL pin conencted to PRGx_PRU1_GPIO10, this DT property can
be added to eth node of ICSSG, MII port to support half duplex operation at
that port.

Signed-off-by: MD Danish Anwar <danishanwar@...com>
---
 Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml b/Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml
index 13371159515a..59da9aeaee7e 100644
--- a/Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml
+++ b/Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml
@@ -107,6 +107,13 @@ properties:
               phandle to system controller node and register offset
               to ICSSG control register for RGMII transmit delay
 
+          ti,half-duplex-capable:
+            type: boolean
+            description:
+              Enable half duplex operation on ICSSG MII port. This requires
+              PHY output pin (COL) to be routed to ICSSG GPIO pin
+              (PRGx_PRU0/1_GPIO10) as input.
+
         required:
           - reg
     anyOf:
-- 
2.34.1