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

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Date:   Thu, 19 Oct 2023 01:12:22 +0000
From:   Linu Cherian <lcherian@...vell.com>
To:     Conor Dooley <conor@...nel.org>
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

Hi Conor,

> -----Original Message-----
> From: Conor Dooley <conor@...nel.org>
> Sent: Saturday, October 14, 2023 6:56 PM
> To: Linu Cherian <lcherian@...vell.com>
> Cc: Mike Leach <mike.leach@...aro.org>; suzuki.poulose@....com;
> james.clark@....com; leo.yan@...aro.org; linux-arm-
> kernel@...ts.infradead.org; coresight@...ts.linaro.org; linux-
> kernel@...r.kernel.org; robh+dt@...nel.org;
> krzysztof.kozlowski+dt@...aro.org; conor+dt@...nel.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.

Ack.