Re: [PATCH v17 2/5] phy: core: Add phy_get_by_of_node()

[Manivannan Sadhasivam]

On Sun, Sep 06, 2026 at 03:17:06PM +0100, Bryan O'Donoghue wrote:
> Add new function phy_get_by_of_node() allowing lookup of a phy by
> device_node. Separates existing logic in _of_phy_get() into an internal
> helper method _of_phy_get_with_args() to allow for reuse in new method.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
> ---
>  drivers/phy/phy-core.c  | 95 +++++++++++++++++++++++++++++++++++++------------
>  include/linux/phy/phy.h |  6 ++++
>  2 files changed, 78 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index 89addd732bff3..490a7cde6d40a 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -606,22 +606,51 @@ int phy_validate(struct phy *phy, enum phy_mode mode, int submode,
>  }
>  EXPORT_SYMBOL_GPL(phy_validate);
>  
> +/**
> + * _of_phy_get_with_args() - lookup and obtain a reference to a phy by of_phandle_args
> + * @args: of_phandle_args to the phy
> + *
> + * Returns the phy from the provider's of_xlate, -ENODEV if disabled,

Nit: Kernel-doc expects ':' after 'Returns'.

> + * -EPROBE_DEFER if the provider is not yet registered.
> + */
> +static struct phy *_of_phy_get_with_args(struct of_phandle_args *args)
> +{
> +	struct phy *phy;
> +	struct phy_provider *phy_provider;
> +
> +	lockdep_assert_held(&phy_provider_mutex);
> +
> +	phy_provider = of_phy_provider_lookup(args->np);
> +	if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner))
> +		return ERR_PTR(-EPROBE_DEFER);
> +
> +	if (!of_device_is_available(args->np)) {
> +		dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
> +		phy = ERR_PTR(-ENODEV);
> +		goto out_put_module;
> +	}
> +
> +	phy = phy_provider->of_xlate(phy_provider->dev, args);
> +
> +out_put_module:
> +	module_put(phy_provider->owner);
> +
> +	return phy;
> +}
> +
>  /**
>   * _of_phy_get() - lookup and obtain a reference to a phy by phandle
>   * @np: device_node for which to get the phy
>   * @index: the index of the phy
>   *
> - * Returns the phy associated with the given phandle value,
> - * after getting a refcount to it or -ENODEV if there is no such phy or
> - * -EPROBE_DEFER if there is a phandle to the phy, but the device is
> - * not yet loaded. This function uses of_xlate call back function provided
> - * while registering the phy_provider to find the phy instance.
> + * Returns the phy associated with the given phandle value after getting
> + * a refcount to it; -ENODEV if there is no such phy or the phy is
> + * disabled; -EPROBE_DEFER if the phy provider is not yet available.
>   */
>  static struct phy *_of_phy_get(struct device_node *np, int index)
>  {
>  	int ret;
> -	struct phy_provider *phy_provider;
> -	struct phy *phy = NULL;
> +	struct phy *phy;
>  	struct of_phandle_args args;
>  
>  	lockdep_assert_held(&phy_provider_mutex);
> @@ -637,22 +666,7 @@ static struct phy *_of_phy_get(struct device_node *np, int index)
>  		goto out_put_node;
>  	}
>  
> -	phy_provider = of_phy_provider_lookup(args.np);
> -	if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
> -		phy = ERR_PTR(-EPROBE_DEFER);
> -		goto out_put_node;
> -	}
> -
> -	if (!of_device_is_available(args.np)) {
> -		dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
> -		phy = ERR_PTR(-ENODEV);
> -		goto out_put_module;
> -	}
> -
> -	phy = phy_provider->of_xlate(phy_provider->dev, &args);
> -
> -out_put_module:
> -	module_put(phy_provider->owner);
> +	phy = _of_phy_get_with_args(&args);
>  
>  out_put_node:
>  	of_node_put(args.np);
> @@ -1001,6 +1015,41 @@ struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
>  }
>  EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
>  
> +/**
> + * phy_get_by_of_node() - lookup and obtain a reference to a phy by device_node
> + * @np: node containing the phy
> + *
> + * Returns the phy associated with the device node or ERR_PTR.

Same comment.

> + */
> +struct phy *phy_get_by_of_node(struct device_node *np)
> +{
> +	struct of_phandle_args args = { .np = np, .args_count = 0 };
> +	struct phy *phy;
> +
> +	if (!np)
> +		return ERR_PTR(-EINVAL);

Is this check really needed? None of the other phy_get*() functions have this
check.

> +
> +	mutex_lock(&phy_provider_mutex);
> +
> +	phy = _of_phy_get_with_args(&args);
> +

Nit: Drop the newline.

- Mani

-- 
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