linux-kernel - Re: [PATCH 2/3] pmdomain: imx93-blk-ctrl: convert to devm

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Message-ID: <aS4ZpyhrJ1IpUCKv@lizhi-Precision-Tower-5810>
Date: Mon, 1 Dec 2025 17:41:43 -0500
From: Frank Li <Frank.li@....com>
To: Marco Felsch <m.felsch@...gutronix.de>
Cc: Ulf Hansson <ulf.hansson@...aro.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, linux-pm@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] pmdomain: imx93-blk-ctrl: convert to devm_* only

On Mon, Dec 01, 2025 at 06:12:06PM +0100, Marco Felsch wrote:
> Some APIs used by this driver don't have devm_ helpers yet. Instead of
> using the devm_add_action_or_reset() the current driver is based on hand
> crafted error goto paths and a .remove() callback.
>
> Convert the driver to devm_ APIs only by making use of
> devm_add_action_or_reset() and devm_pm_runtime_enable() to simplify the
> release and error path.

Nit: I think keep this paragaph should be enough.

>
> Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
> ---
>  drivers/pmdomain/imx/imx93-blk-ctrl.c | 64 +++++++++++++++--------------------
>  1 file changed, 27 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/pmdomain/imx/imx93-blk-ctrl.c b/drivers/pmdomain/imx/imx93-blk-ctrl.c
> index 2aa163aef8de4ee901b9cde76ce2aad246c8c08a..13b0de6dd689cf944e034f7666a4e97b0118e3bd 100644
> --- a/drivers/pmdomain/imx/imx93-blk-ctrl.c
> +++ b/drivers/pmdomain/imx/imx93-blk-ctrl.c
> @@ -188,6 +188,20 @@ static int imx93_blk_ctrl_power_off(struct generic_pm_domain *genpd)
>  	return 0;
>  }
>
...
>  static struct lock_class_key blk_ctrl_genpd_lock_class;
>
>  static int imx93_blk_ctrl_probe(struct platform_device *pdev)
> @@ -256,10 +270,8 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
>  			domain->clks[j].id = data->clk_names[j];
>
>  		ret = devm_clk_bulk_get(dev, data->num_clks, domain->clks);
> -		if (ret) {
> -			dev_err_probe(dev, ret, "failed to get clock\n");
> -			goto cleanup_pds;
> -		}
> +		if (ret)
> +			return dev_err_probe(dev, ret, "failed to get clock\n");
>
>  		domain->genpd.name = data->name;
>  		domain->genpd.power_on = imx93_blk_ctrl_power_on;
> @@ -267,11 +279,12 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
>  		domain->bc = bc;
>
>  		ret = pm_genpd_init(&domain->genpd, NULL, true);
> -		if (ret) {
> -			dev_err_probe(dev, ret, "failed to init power domain\n");
> -			goto cleanup_pds;
> -		}
> +		if (ret)
> +			return dev_err_probe(dev, ret, "failed to init power domain\n");
>
> +		ret = devm_add_action_or_reset(dev, imx93_release_pm_genpd, &domain->genpd);
> +		if (ret)
> +			return dev_err_probe(dev, ret, "failed to add pm_genpd release callback\n");
>  		/*
>  		 * We use runtime PM to trigger power on/off of the upstream GPC
>  		 * domain, as a strict hierarchical parent/child power domain
> @@ -288,39 +301,17 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
>  		bc->onecell_data.domains[i] = &domain->genpd;
>  	}
>
> -	pm_runtime_enable(dev);
> +	devm_pm_runtime_enable(dev);

Need check return value

>
>  	ret = of_genpd_add_provider_onecell(dev->of_node, &bc->onecell_data);
> -	if (ret) {
> -		dev_err_probe(dev, ret, "failed to add power domain provider\n");
> -		goto cleanup_pds;
> -	}
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to add power domain provider\n");
>
> -	dev_set_drvdata(dev, bc);

why remove dev_set_drvdata(dev, bc)

Frank
> +	ret = devm_add_action_or_reset(dev, imx93_release_genpd_provider, dev->of_node);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to add genpd_provider release callback\n");
>
>  	return 0;
> -
> -cleanup_pds:
> -	for (i--; i >= 0; i--)
> -		pm_genpd_remove(&bc->domains[i].genpd);
> -
> -	return ret;
> -}
> -
> -static void imx93_blk_ctrl_remove(struct platform_device *pdev)
> -{
> -	struct imx93_blk_ctrl *bc = dev_get_drvdata(&pdev->dev);
> -	int i;
> -
> -	of_genpd_del_provider(pdev->dev.of_node);
> -
> -	pm_runtime_disable(&pdev->dev);
> -
> -	for (i = 0; i < bc->onecell_data.num_domains; i++) {
> -		struct imx93_blk_ctrl_domain *domain = &bc->domains[i];
> -
> -		pm_genpd_remove(&domain->genpd);
> -	}
>  }
>
>  static const struct imx93_blk_ctrl_domain_data imx93_media_blk_ctl_domain_data[] = {
> @@ -455,7 +446,6 @@ MODULE_DEVICE_TABLE(of, imx93_blk_ctrl_of_match);
>
>  static struct platform_driver imx93_blk_ctrl_driver = {
>  	.probe = imx93_blk_ctrl_probe,
> -	.remove = imx93_blk_ctrl_remove,
>  	.driver = {
>  		.name = "imx93-blk-ctrl",
>  		.of_match_table = imx93_blk_ctrl_of_match,
>
> --
> 2.47.3
>