netdev - RE: [EXT] Re: [PATCH v1] arm64: dts: fsl: ls1028a-rdb: Add dts file to choose swp5 as dsa master

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Message-ID: <VI1PR04MB56777E60653203A471B9864EE1FD9@VI1PR04MB5677.eurprd04.prod.outlook.com>
Date:   Mon, 16 Aug 2021 06:03:52 +0000
From:   Hongbo Wang <hongbo.wang@....com>
To:     Vladimir Oltean <vladimir.oltean@....com>
CC:     Andrew Lunn <andrew@...n.ch>, Hongjun Chen <hongjun.chen@....com>,
        Po Liu <po.liu@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Leo Li <leoyang.li@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH v1] arm64: dts: fsl: ls1028a-rdb: Add dts file
 to choose swp5 as dsa master


> On Fri, Aug 13, 2021 at 01:56:53PM +0000, Hongbo Wang wrote:
> > > You will end up with two DT blobs with the same top level
> > > compatible. This is going to cause confusion. I suggest you add an
> > > additional top level compatible to make it clear this differs from
> > > the compatible = "fsl,ls1028a-rdb", "fsl,ls1028a" blob.
> > >
> > >    Andrew
> >
> > hi Andrew,
> >
> >   thanks for comments.
> >
> >   this "fsl-ls1028a-rdb-dsa-swp5-eno3.dts" is also for fsl-ls1028a-rdb
> > platform, the only difference with "fsl-ls1028a-rdb.dts" is that it
> > use swp5 as dsa master, not swp4, and it's based on
> > "fsl-ls1028a-rdb.dts", so I choose this manner, if "fsl-ls1028a-rdb.dts" has
> some modification for new version, this file don't need be changed.
> 
> I tend to agree with Hongbo. What confusion is it going to cause? It is
> fundamentally the same board, just an Ethernet port stopped having 'status =
> "disabled"' and another changed role, all inside of the SoC with no
> externally-visible change. If anything, I think that creating a new top-level
> compatible for each small change like this would create a bloat-fest of its own.
> 
> I was going to suggest as an alternative to define a device tree overlay file with
> the changes in the CPU port assignment, instead of defining a wholly new DTS
> for the LS1028A reference design board. But I am pretty sure that it is not
> possible to specify a /delete-property/ inside a device tree overlay file, so that
> won't actually work.

hi Vladimir,

  if don't specify "/delete-property/" in this dts file, the corresponding dtb will not work well,
so I add it to delete 'ethernet' property from mscc_felix_port4 explicitly.

thanks,
hongbo