netdev - Re: [PATCH 1/3] dt-bings: net: fsl,fec: update compatible item

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Date:   Fri, 19 Aug 2022 09:31:37 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Peng Fan <peng.fan@....com>, Wei Fang <wei.fang@....com>,
        Shawn Guo <shawnguo@...nel.org>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>, Jacky Bai <ping.bai@....com>,
        "sudeep.holla@....com" <sudeep.holla@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Aisheng Dong <aisheng.dong@....com>
Subject: Re: [PATCH 1/3] dt-bings: net: fsl,fec: update compatible item

On 19/08/2022 06:13, Peng Fan wrote:
>>>
>> Sorry, I did not explain clearly last time, I just mentioned that imx8ulp fec
>> was totally reused from imx6ul and was a little different from imx6q.
>> So what should I do next? Should I fix the binding doc ?
> 
> Just my understanding, saying i.MX6Q supports feature A,
> i.MX6UL support feature A + B, Then i.MX6UL is compatible with i.MX6Q.

Or if i.MX8ULP can bind with any previous compatible and still work
(with limited subset of features).

> 
> If upper is true from hardware level, then i.MX8ULP FEC node
> should contain 8ulp, 6ul, 6q.
> 
> But the list may expand too long if more and more devices are supported
> and hardware backward compatible

True. I guess three items is the limit and anything newer should restart
the sequence.

Best regards,
Krzysztof