linux-kernel - Re: [PATCH v1 1/4] device property: Split fwnode_get_child_node

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Message-ID: <Z9FxrD8cVTfpqxon@kuha.fi.intel.com>
Date: Wed, 12 Mar 2025 13:36:12 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rob Herring (Arm)" <robh@...nel.org>,
	Markus Elfring <elfring@...rs.sourceforge.net>,
	Jakob Riepler <jakob+lkml@...anoidlabs.org>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-leds@...r.kernel.org, linux-usb@...r.kernel.org,
	Daniel Scally <djrscally@...il.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>, Lee Jones <lee@...nel.org>,
	Pavel Machek <pavel@...nel.org>,
	Matti Vaittinen <mazziesaccount@...il.com>,
	Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH v1 1/4] device property: Split
 fwnode_get_child_node_count()

On Mon, Mar 10, 2025 at 04:54:51PM +0200, Andy Shevchenko wrote:
> The new helper is introduced to allow counting the child firmware nodes
> of their parent without requiring a device to be passed. This also makes
> the fwnode and device property API more symmetrical with the rest.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/base/property.c  | 12 ++++++------
>  include/linux/property.h |  7 ++++++-
>  2 files changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index c1392743df9c..805f75b35115 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -928,22 +928,22 @@ bool fwnode_device_is_available(const struct fwnode_handle *fwnode)
>  EXPORT_SYMBOL_GPL(fwnode_device_is_available);
>  
>  /**
> - * device_get_child_node_count - return the number of child nodes for device
> - * @dev: Device to count the child nodes for
> + * fwnode_get_child_node_count - return the number of child nodes for a given firmware node
> + * @fwnode: Pointer to the parent firmware node
>   *
> - * Return: the number of child nodes for a given device.
> + * Return: the number of child nodes for a given firmware node.
>   */
> -unsigned int device_get_child_node_count(const struct device *dev)
> +unsigned int fwnode_get_child_node_count(const struct fwnode_handle *fwnode)
>  {
>  	struct fwnode_handle *child;
>  	unsigned int count = 0;
>  
> -	device_for_each_child_node(dev, child)
> +	fwnode_for_each_child_node(fwnode, child)
>  		count++;
>  
>  	return count;
>  }
> -EXPORT_SYMBOL_GPL(device_get_child_node_count);
> +EXPORT_SYMBOL_GPL(fwnode_get_child_node_count);
>  
>  bool device_dma_supported(const struct device *dev)
>  {
> diff --git a/include/linux/property.h b/include/linux/property.h
> index e214ecd241eb..bc5bfc98176b 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -208,7 +208,12 @@ DEFINE_FREE(fwnode_handle, struct fwnode_handle *, fwnode_handle_put(_T))
>  int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
>  int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name);
>  
> -unsigned int device_get_child_node_count(const struct device *dev);
> +unsigned int fwnode_get_child_node_count(const struct fwnode_handle *fwnode);
> +
> +static inline unsigned int device_get_child_node_count(const struct device *dev)
> +{
> +	return fwnode_get_child_node_count(dev_fwnode(dev));
> +}
>  
>  static inline int device_property_read_u8(const struct device *dev,
>  					  const char *propname, u8 *val)
> -- 
> 2.47.2

-- 
heikki