Subject: Re: [RFC-PATCH] net: stmmac: Add KR port support.

From: Andrew Lunn <[email-masked]>
Date: Fri, 30 Jul 2021 05:01:44 +0200

On Thu, Jul 29, 2021 at 04:44:42PM -0700, Daniel Walker wrote:
> From: Balamurugan Selvarajan <[email-masked]>
> 
> For KR port the mii interface is a chip-to-chip
> interface without a mechanical connector. So PHY
> inits are not applicable. In this case MAC is
> configured to operate at forced speed(1000Mbps)
> and full duplex. Modified driver to accommodate
> PHY and NON-PHY mode.

I agree with Florian here. Look at all the in kernel examples of a SoC
MAC connected to an Ethernet switch. Some use rgmii, others 1000BaseX
or higher. But they all follow the same scheme, and don't need
invasive MAC driver changes.

    Andrew