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

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Message-ID: <YRZvItRlSpF2Xf+S@lunn.ch>
Date:   Fri, 13 Aug 2021 15:09:54 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     hongbo.wang@....com
Cc:     hongjun.chen@....com, po.liu@....com, shawnguo@...nel.org,
        leoyang.li@....com, vladimir.oltean@....com, robh+dt@...nel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        f.fainelli@...il.com, vivien.didelot@...il.com,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] arm64: dts: fsl: ls1028a-rdb: Add dts file to choose
 swp5 as dsa master

On Fri, Aug 13, 2021 at 11:01:55AM +0800, hongbo.wang@....com wrote:
> From: hongbo wang <hongbo.wang@....com>
> 
> some use cases want to use swp4-eno2 link as ordinary data path,
> so we can enable swp5 as dsa master, the data from kernel can
> be transmitted to eno3, then send to swp5 via internal link, switch will
> forward it to swp0-3.
> 
> the data to kernel will come from swp0-3, and received by kernel
> via swp5-eno3 link.
 
> new file mode 100644
> index 000000000000..a88396c137a1
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb-dsa-swp5-eno3.dts
> @@ -0,0 +1,27 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Device Tree file for NXP LS1028A RDB with dsa master swp5-eno3.
> + *
> + * Copyright 2018-2021 NXP
> + *
> + * Hongbo Wang <hongbo.wang@....com>
> + *
> + */
> +
> +/dts-v1/;
> +#include "fsl-ls1028a-rdb.dts"

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