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

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Date:   Fri, 13 Aug 2021 14:07:46 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Hongbo Wang <hongbo.wang@....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.