linux-kernel - Re: [PATCH v8 1/7] dt-bindings: arm: Add support for Qualcomm TGU trace

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Message-ID: <176540010050.3328122.16194666326592248573.robh@kernel.org>
Date: Wed, 10 Dec 2025 14:55:01 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Songwei Chai <songwei.chai@....qualcomm.com>
Cc: devicetree@...r.kernel.org, james.clark@....com, suzuki.poulose@....com,
	linux-arm-kernel@...ts.infradead.org, mike.leach@...aro.org,
	linux-kernel@...r.kernel.org, conor+dt@...nel.org,
	kernel@....qualcomm.com, alexander.shishkin@...ux.intel.com,
	krzk+dt@...nel.org, coresight@...ts.linaro.org,
	andersson@...nel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v8 1/7] dt-bindings: arm: Add support for Qualcomm TGU
 trace


On Wed, 03 Dec 2025 01:00:49 -0800, Songwei Chai wrote:
> The Trigger Generation Unit (TGU) is designed to detect patterns or
> sequences within a specific region of the System on Chip (SoC). Once
> configured and activated, it monitors sense inputs and can detect a
> pre-programmed state or sequence across clock cycles, subsequently
> producing a trigger.
> 
>    TGU configuration space
>         offset table
>  x-------------------------x
>  |                         |
>  |                         |
>  |                         |                           Step configuration
>  |                         |                             space layout
>  |   coresight management  |                           x-------------x
>  |        registers        |                     |---> |             |
>  |                         |                     |     |  reserve    |
>  |                         |                     |     |             |
>  |-------------------------|                     |     |-------------|
>  |                         |                     |     | priority[3] |
>  |         step[7]         |<--                  |     |-------------|
>  |-------------------------|   |                 |     | priority[2] |
>  |                         |   |                 |     |-------------|
>  |           ...           |   |Steps region     |     | priority[1] |
>  |                         |   |                 |     |-------------|
>  |-------------------------|   |                 |     | priority[0] |
>  |                         |<--                  |     |-------------|
>  |         step[0]         |-------------------->      |             |
>  |-------------------------|                           |  condition  |
>  |                         |                           |             |
>  |     control and status  |                           x-------------x
>  |           space         |                           |             |
>  x-------------------------x                           |Timer/Counter|
>                                                        |             |
> 						       x-------------x
> TGU Configuration in Hardware
> 
> The TGU provides a step region for user configuration, similar
> to a flow chart. Each step region consists of three register clusters:
> 
> 1.Priority Region: Sets the required signals with priority.
> 2.Condition Region: Defines specific requirements (e.g., signal A
> reaches three times) and the subsequent action once the requirement is
> met.
> 3.Timer/Counter (Optional): Provides timing or counting functionality.
> 
> Add a new tgu.yaml file to describe the bindings required to
> define the TGU in the device trees.
> 
> Signed-off-by: Songwei Chai <songwei.chai@....qualcomm.com>
> ---
>  .../devicetree/bindings/arm/qcom,tgu.yaml     | 92 +++++++++++++++++++
>  1 file changed, 92 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/qcom,tgu.yaml
> 

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>