linux-kernel - Re: [PATCH 2/2] net: dsa: LAN9303: Add basic support for LAN9354

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Message-ID: <YxJnw40yGUFGYopB@lunn.ch>
Date:   Fri, 2 Sep 2022 22:29:55 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jerry.Ray@...rochip.com
Cc:     vivien.didelot@...il.com, f.fainelli@...il.com, olteanv@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] net: dsa: LAN9303: Add basic support for LAN9354

> >Please validate that what you find on the board actually is what the compatible says it should be. If you don't validate it, there will be some DT blobs that have the wrong value, but probe fine. But then you cannot actually make use of the compatible string in the driver to do something different between the 9303 and the 9354 because some boards have the wrong compatible....

Please configure your mail client to stop corrupting emails. My reply
definitely did not have lines this long.

> >
> >     Andrew
> >
> 

> At this time, the driver is meant to support both devices equally.  In the future, I will be adding content that only applies to the LAN9354.  That is when I'm planning to add .data to the .compatible entries.

Which makes it even more important to validate the compatible against
what is actually on the board. As i said, in its current state, people
are going to get it wrong, and your .data won't work, since it will be
for a different chip to which is actually on the board.

    Andrew