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

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Message-ID: <7036b8c5-b920-3de7-21d0-474e759e2624@arm.com>
Date:   Thu, 30 Jul 2020 17:38:37 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     mathieu.poirier@...aro.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mike.leach@...aro.org, coresight@...ts.linaro.org,
        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 07/29/2020 06:20 PM, Mathieu Poirier wrote:
> 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.

AFAIUC, "compatible" stands for something that is compatible with v4.4.
All v4.4+ versions that are compatible with v4.4 are covered here.
Having said that I am fine with "arm,coresight-etm-v4.4+" , if it
is fine by the DT conventions.

Cheers
Suzuki