linux-kernel - Re: [PATCH v9 7/7] qcom-tgu: Add reset node to initialize

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Message-ID: <7cfbcc2e-b6ca-47cf-83fe-1c61df40885b@arm.com>
Date: Tue, 6 Jan 2026 10:16:33 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Songwei Chai <songwei.chai@....qualcomm.com>, andersson@...nel.org,
 alexander.shishkin@...ux.intel.com, mike.leach@...aro.org,
 james.clark@....com, krzk+dt@...nel.org, conor+dt@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-arm-msm@...r.kernel.org, coresight@...ts.linaro.org,
 devicetree@...r.kernel.org, gregkh@...uxfoundation.org
Subject: Re: [PATCH v9 7/7] qcom-tgu: Add reset node to initialize

On 19/12/2025 06:59, Songwei Chai wrote:
> Add reset node to initialize the value of
> priority/condition_decode/condition_select/timer/counter nodes.
> 
> Signed-off-by: Songwei Chai <songwei.chai@....qualcomm.com>
> ---
>   .../ABI/testing/sysfs-bus-amba-devices-tgu    |  7 ++
>   drivers/hwtracing/qcom/tgu.c                  | 74 +++++++++++++++++++
>   2 files changed, 81 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu b/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu
> index 010eade0a1c5..0733b3e07b45 100644
> --- a/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu
> +++ b/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu
> @@ -42,3 +42,10 @@ KernelVersion	6.19
>   Contact:	Jinlong Mao <jinlong.mao@....qualcomm.com>, Songwei Chai <songwei.chai@....qualcomm.com>
>   Description:
>   		(RW) Set/Get the counter value with specific step for TGU.
> +
> +What:		/sys/bus/amba/devices/<tgu-name>/reset_tgu
> +Date:		December 2025
> +KernelVersion	6.19
> +Contact:	Jinlong Mao <jinlong.mao@....qualcomm.com>, Songwei Chai <songwei.chai@....qualcomm.com>
> +Description:
> +		(Write) Write 1 to reset the dataset for TGU.
> diff --git a/drivers/hwtracing/qcom/tgu.c b/drivers/hwtracing/qcom/tgu.c
> index d4210869556e..5a8c6af9b719 100644
> --- a/drivers/hwtracing/qcom/tgu.c
> +++ b/drivers/hwtracing/qcom/tgu.c
> @@ -425,8 +425,82 @@ static ssize_t enable_tgu_store(struct device *dev,


> +
> +	dev_dbg(dev, "Coresight-TGU reset complete\n");

Qualcomm-TGU ?

Suzuki