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

Andrew Lunn
2023-04-19T20:58:10Z

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