linux-kernel - Re: [EXT] Re: [PATCH v2 1/4] dt-bindings: perf: fsl-imx-ddr: Add i.MX95 compatible

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Message-ID: <20231210-scrap-backdrop-8bae1acc07fd@spud>
Date:   Sun, 10 Dec 2023 13:39:12 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Xu Yang <xu.yang_2@....com>
Cc:     Frank Li <frank.li@....com>, "will@...nel.org" <will@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
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        "jolsa@...nel.org" <jolsa@...nel.org>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "irogers@...gle.com" <irogers@...gle.com>,
        dl-linux-imx <linux-imx@....com>,
        "mike.leach@...aro.org" <mike.leach@...aro.org>,
        "leo.yan@...aro.org" <leo.yan@...aro.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
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        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>
Subject: Re: [EXT] Re: [PATCH v2 1/4] dt-bindings: perf: fsl-imx-ddr: Add
 i.MX95 compatible

On Sun, Dec 10, 2023 at 04:27:16AM +0000, Xu Yang wrote:
> Hi Conor,
> 
> > On Fri, Dec 08, 2023 at 04:53:59PM +0800, Xu Yang wrote:
> > > i.MX95 has a DDR pmu. This will add a compatible for it.
> > 
> > On v1 we had a discussion because the commit message wasn't clear about
> > whether or not the device was compatible with existing ones. For some
> > reason, the v2 patch _removes_ information from the commit message
> > rather than tries to explain.
> > This [1] message of yours, that I didn't get a chance to reply to before
> > you sent this new version, seems to say that there should be an
> > imx93-ddr-pmu fallback.
> 
> Thanks for your comments. 
> 
> Just read my previous comment in [1] and found I made a mistake.
> Now I'll try to clarify it here.
> 
> Imx95 and imx93 have different AXI filter configuration. I need a 
> compatible for imx95 since the driver cannot differentiate them. 
> 
> Then I need to consider below two options:
> 1. compatible = "fsl,imx95-ddr-pmu", "fsl,imx93-ddr-pmu"
> 2. compatible = "fsl,imx95-ddr-pmu"
> 
> Both of them work correctly on imx95. When I make changes in
> driver for imx95, imx93 is not affected.
> 
> For basic functions, imx95 is compatible with imx93. I select the 2rd
> form for simplicity. If the first form is optimal, I can change it in next
> version.

The first form is preferred, yes.

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