linux-kernel - Re: [PATCH] arm64: qcom: dts: sm8750: add coresight nodes

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Message-ID: <350ddcc0-cbab-4b58-8b50-5004f27688db@oss.qualcomm.com>
Date: Tue, 18 Nov 2025 11:03:58 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Jie Gan <jie.gan@....qualcomm.com>,
        Bjorn Andersson
 <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Tingwei Zhang <tingwei.zhang@....qualcomm.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: qcom: dts: sm8750: add coresight nodes

On 11/17/25 10:31 AM, Jie Gan wrote:
> Add CoreSight DT nodes for AOSS, QDSS, Turing, and Modem blocks to enable
> the STM and TPDM sources to route trace data to the ETF for debugging.
> 
> Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/sm8750.dtsi | 981 +++++++++++++++++++++++++++++++++++
>  1 file changed, 981 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8750.dtsi b/arch/arm64/boot/dts/qcom/sm8750.dtsi
> index 3f0b57f428bb..56c2605f3e0d 100644
> --- a/arch/arm64/boot/dts/qcom/sm8750.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8750.dtsi
> @@ -3313,6 +3313,948 @@ tcsrcc: clock-controller@...4008 {
>  			#reset-cells = <1>;
>  		};
>  
> +		stm@...02000 {
> +			compatible = "arm,coresight-stm", "arm,primecell";
> +			reg = <0x0 0x10002000 0x0 0x1000>,
> +			      <0x0 0x37280000 0x0 0x180000>;

This region is a little bigger but it's not described clearly. Is there
a reason to use this slice of it and not the whole thing?

[...]

> +					funnel_in0_in0: endpoint {
> +						remote-endpoint =
> +						<&tn_ag_out>;

Please unwrap this line

[...]


> +		tn@...ab000 {
> +			compatible = "qcom,coresight-tnoc", "arm,primecell";

"tnoc@"?

[...]


> +	tpdm_llm {

Node names still can't include underscores ;)

Please also rename 'llm' and 'turing' to 'cdsp' unless there's a good
reason not to

I confirmed the coresight components addresses match their claimed function

Konrad