linux-kernel - Re: [PATCH v3 3/3] thermal: qcom: tsens: rework debugfs file structure

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Date:   Sat, 22 Oct 2022 15:08:46 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Christian Marangi <ansuelsmth@...il.com>,
        Amit Kucheria <amitk@...nel.org>,
        Thara Gopinath <thara.gopinath@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] thermal: qcom: tsens: rework debugfs file
 structure

On 22/10/2022 14:56, Christian Marangi wrote:
> The current tsens debugfs structure is composed by:
> - a tsens dir in debugfs with a version file
> - a directory for each tsens istance with sensors file to dump all the
>    sensors value.

s/istance/instance/

The patch looks good to me, no need to resend, I'll fix the typos

> This works on the assumption that we have the same version for each
> istance but this assumption seems fragile and with more than one tsens
> istance results in the version file not tracking each of them.
> 
> A better approach is to just create a subdirectory for each tsens
> istance and put there version and sensors debugfs file.
> 
> Using this new implementation results in less code since debugfs entry
> are created only on successful tsens probe.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
>   drivers/thermal/qcom/tsens.c | 13 +++----------
>   1 file changed, 3 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
> index 467585c45d34..fc12d7c07de4 100644
> --- a/drivers/thermal/qcom/tsens.c
> +++ b/drivers/thermal/qcom/tsens.c
> @@ -704,21 +704,14 @@ DEFINE_SHOW_ATTRIBUTE(dbg_sensors);
>   static void tsens_debug_init(struct platform_device *pdev)
>   {
>   	struct tsens_priv *priv = platform_get_drvdata(pdev);
> -	struct dentry *root, *file;
>   
> -	root = debugfs_lookup("tsens", NULL);
> -	if (!root)
> +	priv->debug_root = debugfs_lookup("tsens", NULL);
> +	if (!priv->debug_root)
>   		priv->debug_root = debugfs_create_dir("tsens", NULL);
> -	else
> -		priv->debug_root = root;
> -
> -	file = debugfs_lookup("version", priv->debug_root);
> -	if (!file)
> -		debugfs_create_file("version", 0444, priv->debug_root,
> -				    pdev, &dbg_version_fops);
>   
>   	/* A directory for each instance of the TSENS IP */
>   	priv->debug = debugfs_create_dir(dev_name(&pdev->dev), priv->debug_root);
> +	debugfs_create_file("version", 0444, priv->debug, pdev, &dbg_version_fops);
>   	debugfs_create_file("sensors", 0444, priv->debug, pdev, &dbg_sensors_fops);
>   }
>   #else


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