linux-kernel - [RFC PATCH net-next 0/2] Add Half Duplex support for ICSSG Driver

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Message-ID: <20230830113134.1226970-1-danishanwar@ti.com>
Date:   Wed, 30 Aug 2023 17:01:32 +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 0/2] Add Half Duplex support for ICSSG Driver

This series adds support for half duplex operation for ICSSG driver.

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 in the
first patch of the series. 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.

Second patch of the series configures driver to support half-duplex
operation if the DT property "ti,half-duplex-capable" is enabled.

This series depends on [1] which is posted as RFC.

[1] https://lore.kernel.org/all/20230830110847.1219515-1-danishanwar@ti.com/

Thanks and Regards,
Md Danish Anwar

MD Danish Anwar (2):
  dt-bindings: net: Add documentation for Half duplex support.
  net: ti: icssg-prueth: Add support for half duplex operation

 .../bindings/net/ti,icssg-prueth.yaml           |  7 +++++++
 drivers/net/ethernet/ti/icssg/icssg_config.c    | 14 ++++++++++++++
 drivers/net/ethernet/ti/icssg/icssg_prueth.c    | 17 +++++++++++++++--
 drivers/net/ethernet/ti/icssg/icssg_prueth.h    |  2 ++
 4 files changed, 38 insertions(+), 2 deletions(-)

-- 
2.34.1