linux-kernel - Re: [EXT] Re: [PATCH 1/7] dt-bindings: arm: coresight-tmc: Add "memory-region" property

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Date:   Sat, 14 Oct 2023 14:25:50 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Linu Cherian <lcherian@...vell.com>
Cc:     Mike Leach <mike.leach@...aro.org>,
        "suzuki.poulose@....com" <suzuki.poulose@....com>,
        "james.clark@....com" <james.clark@....com>,
        "leo.yan@...aro.org" <leo.yan@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "coresight@...ts.linaro.org" <coresight@...ts.linaro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "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>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        George Cherian <gcherian@...vell.com>
Subject: Re: [EXT] Re: [PATCH 1/7] dt-bindings: arm: coresight-tmc: Add
 "memory-region" property

On Sat, Oct 14, 2023 at 11:36:37AM +0000, Linu Cherian wrote:
> > > +      - description: Reserved meta data memory. Used for ETR and ETF sinks.
> > > +
> > > +  memory-region-names:
> > > +    items:
> > > +      - const: trace-mem
> > > +      - const: metadata-mem
> > > +
> > 
> > Is there a constraint required here? If we are using the memory area for
> > trace in a panic situation, then we must have the meta data memory area
> > defined?
> > Perhaps a set of names such as "etr-trace-mem", "panic-trace-mem" ,
> > "panic-metadata-mem", were the first is for general ETR trace in non-panic
> > situation and then constrain the "panic-" areas to appear together.
> > The "etr-trace-mem", "panic-trace-mem" could easily point to the same
> > area.
> > 
> As noted above, we do not have other generic use case for these reserved regions now.
> Hence two regions/names, panic-trace-mem and panic-metadata-mem with constraints kept as
>  minItems: 2 and maxItems: 2 would suffice ?

Whatever you do, please delete the -mem suffix.

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