linux-kernel - Re: [PATCH] arm64: dts: imx8mn: Fix duplicate node name

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Date:   Tue, 8 Dec 2020 03:16:35 +0000
From:   "S.j. Wang" <shengjiu.wang@....com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: imx8mn: Fix duplicate node name

Hi

> 
> On Mon, Dec 07, 2020 at 02:21:40PM +0100, Krzysztof Kozlowski wrote:
> > 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@....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@...00000 {
> > >                     #size-cells = <1>;
> > >                     ranges;
> > >
> > > -                   spba: bus@...00000 {
> > > +                   spba: spba-bus@...00000 {
> >
> > The proper node name is "bus" so basically you introduce wrong name to
> > other problem.  Introducing wrong names at least requires a comment.
> 
> I just noticed that my message was barely understandable... so let me fix it:
> 
> The proper node name is "bus" so basically you introduce wrong name to
> _fix_ 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@...00000 {
> >               spba: bus@...00000 {
> >
> > You have to devices with the same unit address. How do you share the
> > address space?
> >
> > I think this should be rather fixed.
> 
> And again, hungry keyboard ate a letter, so:
> 
> You have _two_ devices with the same unit address. How do you share the
> address space?
> I think this should be rather fixed.
> 

spba is the first block of aips1 space, so it has same start address as
aips1.

Best regards
Wang shengjiu