linux-kernel - Re: [PATCH v3 26/26] dts: bindings: coresight: ETM system register access only units

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Date:   Tue, 10 Nov 2020 10:51:21 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, mike.leach@...aro.org,
        coresight@...ts.linaro.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v3 26/26] dts: bindings: coresight: ETM system register
 access only units

On 11/9/20 8:50 PM, Mathieu Poirier wrote:
> On Wed, Oct 28, 2020 at 10:09:45PM +0000, Suzuki K Poulose wrote:
>> Document the bindings for ETMs with system register accesses.
>>
>> Cc: devicetree@...r.kernel.org
>> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
>> Cc: Mike Leach <mike.leach@...aro.org>
>> Cc: Rob Herring <robh@...nel.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>> ---
>>   Documentation/devicetree/bindings/arm/coresight.txt | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
>> index d711676b4a51..bff96a550102 100644
>> --- a/Documentation/devicetree/bindings/arm/coresight.txt
>> +++ b/Documentation/devicetree/bindings/arm/coresight.txt
>> @@ -34,9 +34,12 @@ 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 with system register access only.
>> +			"arm,coresight-etm-sysreg";
> 
> Please make this "arm,coresight-etm4x-sysreg".  Up to now all reference of
> "etm" without a version related to ETMv3/PTM1.1.  If we start mixing things it
> will be come insanely confusing.

Agreed. will rename it.

Suzuki