linux-kernel - [RFC PATCH net-next 5/6] microchip: lan865x: add driver support for Microchip's LAN865X MACPHY

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Message-Id: <20230915130118.927821-1-david.wretman@ferroamp.se>
Date:   Fri, 15 Sep 2023 15:01:19 +0200
From:   David Wretman <david.wretman@...roamp.se>
To:     parthiban.veerasooran@...rochip.com
Cc:     Nicolas.Ferre@...rochip.com, Thorsten.Kummermehr@...rochip.com,
        UNGLinuxDriver@...rochip.com, Woojung.Huh@...rochip.com,
        andrew@...n.ch, casper.casan@...il.com, conor+dt@...nel.org,
        corbet@....net, davem@...emloft.net, devicetree@...r.kernel.org,
        edumazet@...gle.com, horatiu.vultur@...rochip.com,
        horms@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        kuba@...nel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, rdunlap@...radead.org, robh+dt@...nel.org,
        steen.hegelund@...rochip.com,
        David Wretman <david.wretman@...roamp.se>
Subject: [RFC PATCH net-next 5/6] microchip: lan865x: add driver support for Microchip's LAN865X MACPHY

---
On Fri, Sep 08, 2023 at 07:59:18PM +0530, Parthiban Veerasooran wrote:
> The LAN8650/1 is designed to conform to the OPEN Alliance 10BASE‑T1x
> MAC‑PHY Serial Interface specification, Version 1.1. The IEEE Clause 4
> MAC integration provides the low pin count standard SPI interface to any
> microcontroller therefore providing Ethernet functionality without
> requiring MAC integration within the microcontroller. The LAN8650/1
> operates as an SPI client supporting SCLK clock rates up to a maximum of
> 25 MHz. This SPI interface supports the transfer of both data (Ethernet
> frames) and control (register access).
> 
> By default, the chunk data payload is 64 bytes in size. A smaller payload
> data size of 32 bytes is also supported and may be configured in the
> Chunk Payload Size (CPS) field of the Configuration 0 (OA_CONFIG0)
> register. Changing the chunk payload size requires the LAN8650/1 be reset
> and shall not be done during normal operation.
> 
> The Ethernet Media Access Controller (MAC) module implements a 10 Mbps
> half duplex Ethernet MAC, compatible with the IEEE 802.3 standard.
> 10BASE-T1S physical layer transceiver integrated into the LAN8650/1. The
> PHY and MAC are connected via an internal Media Independent Interface
> (MII).
> 
> Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>

Hi Parthiban,

Thanks for these patches.

One thing I am missing is settings for PLCA parameters. I feel that the
driver is a bit lacking as long as this is missing.

Adding support for the ethtool plca options would make this much more
complete.

Regards,
David