linux-kernel - Re: [RFC PATCH 14/14] dts: bindings: coresight: ETMv4.4 system register access only units

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Message-ID: <20200729172058.GA3060370@xps15>
Date:   Wed, 29 Jul 2020 11:20:58 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mike.leach@...aro.org, coresight@...ts.linaro.org,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [RFC PATCH 14/14] dts: bindings: coresight: ETMv4.4 system
 register access only units

On Wed, Jul 22, 2020 at 06:20:40PM +0100, Suzuki K Poulose wrote:
> Document the bindings for ETMv4.4 and later with only system register
> access.
> 
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: devicetree@...r.kernel.org
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Cc: Mike Leach <mike.leach@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  Documentation/devicetree/bindings/arm/coresight.txt | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
> index d711676b4a51..cfe47bdda728 100644
> --- a/Documentation/devicetree/bindings/arm/coresight.txt
> +++ b/Documentation/devicetree/bindings/arm/coresight.txt
> @@ -34,9 +34,13 @@ its hardware characteristcs.
>  					Program Flow Trace Macrocell:
>  			"arm,coresight-etm3x", "arm,primecell";
>  
> -		- Embedded Trace Macrocell (version 4.x):
> +		- Embedded Trace Macrocell (version 4.x), with memory mapped access.
>  			"arm,coresight-etm4x", "arm,primecell";
>  
> +		- Embedded Trace Macrocell (version 4.4 and later) with system
> +		  register access only.
> +			"arm,coresight-etm-v4.4";

I would rather call this "arm,coresight-etm-v4.4+" so that the binding's
semantic is still relevant when dealing with ETM v4.5 and onward. 

Thanks,
Mathieu

> +
>  		- Coresight programmable Replicator :
>  			"arm,coresight-dynamic-replicator", "arm,primecell";
>  
> -- 
> 2.24.1
>