linux-kernel - Re: [PATCH v6 1/9] coresight: core: Refactoring ctcu_get_active

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Message-ID: <29a61f75-df0b-41da-9c8d-3e2ced0a9ce7@arm.com>
Date: Wed, 3 Dec 2025 16:18:17 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Jie Gan <jie.gan@....qualcomm.com>, Mike Leach <mike.leach@...aro.org>,
 James Clark <james.clark@...aro.org>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Tingwei Zhang <tingwei.zhang@....qualcomm.com>,
 Jinlong Mao <jinlong.mao@....qualcomm.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH v6 1/9] coresight: core: Refactoring ctcu_get_active_port
 and make it generic

On 08/09/2025 03:01, Jie Gan wrote:
> Remove ctcu_get_active_port from CTCU module and add it to the core
> framework.
> 
> The port number is crucial for the CTCU device to identify which ETR
> it serves. With the port number we can correctly get required parameters
> of the CTCU device in TMC module.
> 
> Reviewed-by: Mike Leach <mike.leach@...aro.org>
> Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
> ---
>   drivers/hwtracing/coresight/coresight-core.c      | 24 +++++++++++++++++++++++
>   drivers/hwtracing/coresight/coresight-ctcu-core.c | 19 +-----------------
>   drivers/hwtracing/coresight/coresight-priv.h      |  2 ++
>   3 files changed, 27 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
> index 1accd7cbd54b..042c4fa39e55 100644
> --- a/drivers/hwtracing/coresight/coresight-core.c
> +++ b/drivers/hwtracing/coresight/coresight-core.c
> @@ -580,6 +580,30 @@ struct coresight_device *coresight_get_sink(struct coresight_path *path)
>   }
>   EXPORT_SYMBOL_GPL(coresight_get_sink);
>   
> +/**
> + * coresight_get_in_port_dest: get the in-port number of the dest device
> + * that is connected to the src device.
> + *
> + * @src: csdev of the source device.
> + * @dest: csdev of the destination device.
> + *
> + * Return: port number upon success or -EINVAL for fail.
> + */
> +int coresight_get_in_port_dest(struct coresight_device *src,

Please could we make this more explicit :

	/*
	 * Find the input port number at @csdev where a @remote
	 * device is connected to.
	 */
	coresight_get_in_port(struct coresight_device *csdev,
			      struct coresight_device *remote)
	{

	}
Suzuki