linux-kernel - RE: [PATCH 1/3] dt-bings: net: fsl,fec: update compatible item

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Message-ID: <DB9PR04MB8106947901F27BEDBC8A05A2886C9@DB9PR04MB8106.eurprd04.prod.outlook.com>
Date:   Fri, 19 Aug 2022 07:02:39 +0000
From:   Wei Fang <wei.fang@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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>,
        Peng Fan <peng.fan@....com>
Subject: RE: [PATCH 1/3] dt-bings: net: fsl,fec: update compatible item



> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: 2022年8月19日 14:32
> To: Peng Fan <peng.fan@....com>; Wei Fang <wei.fang@....com>; Shawn
> Guo <shawnguo@...nel.org>
> Cc: davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
> s.hauer@...gutronix.de; netdev@...r.kernel.org; devicetree@...r.kernel.org;
> linux-kernel@...r.kernel.org; kernel@...gutronix.de; festevam@...il.com;
> dl-linux-imx <linux-imx@....com>; Jacky Bai <ping.bai@....com>;
> sudeep.holla@....com; 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.
> 

So, the binding doc doesn't need to be fixed ?