netdev - Re: [PATCH net-next v3 2/8] i2c: designware: Add driver support for Wangxun 10Gb NIC

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Message-ID: <ec095b8a-00af-4fb7-be11-f643ea75e924@lunn.ch>
Date:   Wed, 19 Apr 2023 22:58:03 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jiawen Wu <jiawenwu@...stnetic.com>
Cc:     netdev@...r.kernel.org, linux@...linux.org.uk,
        linux-i2c@...r.kernel.org, linux-gpio@...r.kernel.org,
        olteanv@...il.com, mengyuanlou@...-swift.com,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Subject: Re: [PATCH net-next v3 2/8] i2c: designware: Add driver support for
 Wangxun 10Gb NIC

On Wed, Apr 19, 2023 at 04:27:33PM +0800, Jiawen Wu wrote:
> Wangxun 10Gb ethernet chip is connected to Designware I2C, to communicate
> with SFP.
> 
> Add platform data to pass IOMEM base address, board flag and other
> parameters, since resource address was mapped on ethernet driver.
> 
> The exists IP limitations are dealt as workarounds:
> - IP does not support interrupt mode, it works on polling mode.
> - I2C cannot read continuously, only one byte can at a time.

Are you really sure about that?

It is a major limitation for SFP devices. It means you cannot access
the diagnostics, since you need to perform an atomic 2 byte read.

Or maybe i'm understanding you wrong.

   Andrew