linux-kernel - Re: [PATCH RFC v3 2/2] pmdomain: core: add support for subdomains using power-domain-map

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Message-ID: <e463a278-7e6e-4287-9093-42d0a0d365d2@suswa.mountain>
Date: Wed, 18 Jun 2025 21:16:32 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Kevin Hilman <khilman@...libre.com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
	arm-scmi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v3 2/2] pmdomain: core: add support for subdomains
 using power-domain-map

On Wed, Jun 18, 2025 at 10:48:09AM -0700, Kevin Hilman wrote:
> diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c
> index 88819659df83..3ede4baa4bee 100644
> --- a/drivers/pmdomain/core.c
> +++ b/drivers/pmdomain/core.c
> @@ -3220,6 +3220,40 @@ int of_genpd_parse_idle_states(struct device_node *dn,
>  }
>  EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);
>  
> +int of_genpd_add_subdomain_map(struct device_node *np,
> +			       struct generic_pm_domain *domain,
> +			       int index)
> +{
> +	struct of_phandle_args parent_args;
> +	struct generic_pm_domain *parent_pd;
> +	struct device *dev = &domain->dev;
> +	int ret;
> +
> +	if (!domain)
> +		return -ENODEV;
> +
> +	/*
> +	 * Check for power-domain-map, which implies the primary
> +	 * power-doamin is a subdomain of the parent found in the map.
> +	 */
> +	ret = of_parse_phandle_with_args_map(np, NULL, "power-domain",
> +					     index, &parent_args);
> +	if (!ret && parent_args.np) {

Sorry for the pedanticry but could we flip this around?

	if (ret)
		return ret;

	if (!parent_args.np)
		return 0;

> +		parent_pd = genpd_get_from_provider(&parent_args);
> +		of_node_put(parent_args.np);
> +
> +		if (IS_ERR(parent_pd))
> +			return -EINVAL;

		return PTR_ERR(parent_pd);

> +
> +		ret = pm_genpd_add_subdomain(parent_pd, domain);
> +		if (!ret)

	if (ret)
		return ret;

	dev_dbg(dev, "adding PM domain %s as subdomain of %s\n",
		domain->name, parent_pd->name);

	return 0;

> +			dev_dbg(dev, "adding PM domain %s as subdomain of %s\n",
> +				domain->name, parent_pd->name);
> +	}
> +
> +	return ret;
> +}
> +