linux-kernel - Re: [PATCH v4 1/2] dt-bindings: arm: Add device-name in the coresight components

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Message-ID: <a82cd3f2-a8ba-4f19-820d-509dc45f74c1@arm.com>
Date: Fri, 18 Oct 2024 11:17:54 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
 Mao Jinlong <quic_jinlmao@...cinc.com>, Mike Leach <mike.leach@...aro.org>,
 James Clark <james.clark@....com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, Tingwei Zhang <quic_tingweiz@...cinc.com>,
 Yuanfang Zhang <quic_yuanfang@...cinc.com>,
 Tao Zhang <quic_taozha@...cinc.com>, songchai <quic_songchai@...cinc.com>,
 Jie Gan <quic_jiegan@...cinc.com>
Subject: Re: [PATCH v4 1/2] dt-bindings: arm: Add device-name in the coresight
 components

On 24/07/2024 20:13, Krzysztof Kozlowski wrote:
> On 03/07/2024 14:23, Mao Jinlong wrote:
>> Current name of coresight component's folder consists of prefix of
>> the device and the id in the device list. When run 'ls' command,
>> we can get the register address of the device. Take CTI for example,
>> if we want to set the config for modem CTI, but we can't know which
>> CTI is modem CTI from all current information.
>>
>> cti_sys0 -> ../../../devices/platform/soc@...38f0000.cti/cti_sys0
>> cti_sys1 -> ../../../devices/platform/soc@...3900000.cti/cti_sys1
>>
>> Add device-name in device tree which can provide a better description
>> of the coresight device. It can provide the info like the system or
>> HW it belongs to.
>>
>> Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>
>> ---
>>   .../devicetree/bindings/arm/arm,coresight-cti.yaml          | 6 ++++++
>>   .../devicetree/bindings/arm/arm,coresight-dummy-source.yaml | 6 ++++++
>>   .../devicetree/bindings/arm/arm,coresight-stm.yaml          | 6 ++++++
>>   .../devicetree/bindings/arm/qcom,coresight-tpdm.yaml        | 6 ++++++
>>   4 files changed, 24 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml
>> index 2d5545a2b49c..6a73eaa66a42 100644
>> --- a/Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml
>> +++ b/Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml
>> @@ -98,6 +98,12 @@ properties:
>>     power-domains:
>>       maxItems: 1
>>   
>> +  arm,cs-dev-name:
>> +    $ref: /schemas/types.yaml#/definitions/string
>> +    description:
>> +      Define the name which can describe what kind of HW or system the
>> +      coresight device belongs to.
> 
> Don't we use already label for such cases? Power domains, input, leds,
> panels, IIO, hwmon and more.

We do and if we can get hold of them, that would be ideal. but do we get 
them in the binary DT blob ?  At least I couldn't see them on my Juno
dtb.


Cheers
Suzuki


> 
> Best regards,
> Krzysztof
>