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Date:   Mon, 7 Dec 2020 14:21:40 +0100
From:   Krzysztof Kozlowski <krzk@kernel.org>
To:     Shengjiu Wang <shengjiu.wang@nxp.com>
Cc:     robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de,
        kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm64: dts: imx8mn: Fix duplicate node name
Message-ID: <20201207132140.GA31982@kozik-lap>
References: <1607324004-12960-1-git-send-email-shengjiu.wang@nxp.com>
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On Mon, Dec 07, 2020 at 02:53:24PM +0800, Shengjiu Wang wrote:
> Error log:
> sysfs: cannot create duplicate filename '/bus/platform/devices/30000000.bus'
> 
> The spba bus name is duplicate with aips bus name.
> Refine spba bus name to fix this issue.
> 
> Fixes: 970406eaef3a ("arm64: dts: imx8mn: Enable Asynchronous Sample Rate Converter")
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> ---
>  arch/arm64/boot/dts/freescale/imx8mn.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> index fd669c0f3fe5..30762eb4f0a7 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> @@ -246,7 +246,7 @@ aips1: bus@30000000 {
>  			#size-cells = <1>;
>  			ranges;
>  
> -			spba: bus@30000000 {
> +			spba: spba-bus@30000000 {

The proper node name is "bus" so basically you introduce wrong name to
other problem.  Introducing wrong names at least requires a comment.

However the actual problem here is not in node names but in addresses:

	aips1: bus@30000000 {
		spba: bus@30000000 {

You have to devices with the same unit address. How do you share the
address space?

I think this should be rather fixed.

Best regards,
Krzysztof


>  				compatible = "fsl,spba-bus", "simple-bus";
>  				#address-cells = <1>;
>  				#size-cells = <1>;
> -- 
> 2.27.0
>