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

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Date:   Tue, 3 Oct 2023 04:33:04 +0000
From:   Linu Cherian <lcherian@...vell.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "suzuki.poulose@....com" <suzuki.poulose@....com>,
        "mike.leach@...aro.org" <mike.leach@...aro.org>,
        "james.clark@....com" <james.clark@....com>,
        "leo.yan@...aro.org" <leo.yan@...aro.org>
CC:     "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 Krzysztof,

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Saturday, September 30, 2023 8:59 PM
> To: Linu Cherian <lcherian@...vell.com>; suzuki.poulose@....com;
> mike.leach@...aro.org; james.clark@....com; leo.yan@...aro.org
> Cc: 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: [EXT] Re: [PATCH 1/7] dt-bindings: arm: coresight-tmc: Add
> "memory-region" property
> 
> External Email
> 
> ----------------------------------------------------------------------
> On 29/09/2023 15:37, Linu Cherian wrote:
> > memory-region 0: Reserved trace buffer memory
> >
> >   TMC ETR: When available, use this reserved memory region for
> >   trace data capture. Same region is used for trace data
> >   retention after a panic or watchdog reset.
> >
> >   TMC ETF: When available, use this reserved memory region for
> >   trace data retention synced from internal SRAM after a panic or
> >   watchdog reset.
> >
> > memory-region 1: Reserved meta data memory
> >
> >   TMC ETR, ETF: When available, use this memory for register
> >   snapshot retention synced from hardware registers after a panic
> >   or watchdog reset.
> >
> > Signed-off-by: Linu Cherian <lcherian@...vell.com>
> > ---
> 
> Where is the changelog? This is supposed to be v4 or something later.
> Please, keep proper versioning and changelog.

Sure, will add the changelog from next version onwards. 

Yeah, the last version was RFC v3 and the RFC tag has been dropped from this version onwards.
Hence started this version with V1.

> 
> >  .../bindings/arm/arm,coresight-tmc.yaml       | 19 +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-
> tmc.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-
> tmc.yaml
> > index cb8dceaca70e..45ca4d02d73e 100644
> > --- a/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml
> > +++ b/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml
> > @@ -101,6 +101,22 @@ properties:
> >            and ETF configurations.
> >          $ref: /schemas/graph.yaml#/properties/port
> >
> > +  memory-region:
> > +    items:
> > +      - description: Reserved trace buffer memory for ETR and ETF sinks.
> > +          For ETR, this reserved memory region is used for trace data capture.
> > +          Same region is used for trace data retention as well after a panic
> > +          or watchdog reset.
> > +          For ETF, this reserved memory region is used for retention of trace
> > +          data synced from internal SRAM after a panic or watchdog reset.
> > +
> > +      - description: Reserved meta data memory. Used for ETR and ETF sinks.
> > +
> > +  memory-region-names:
> > +    items:
> > +      - const: trace-mem
> > +      - const: metadata-mem
> 
> Drop the 'mem' suffixes.
> 

Ack. Will remove it in next version.