linux-kernel - Re: [PATCH v1 07/10] device property: Add fwnode_get_next_child

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Date:	Thu, 02 Jul 2015 01:40:31 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v1 07/10] device property: Add fwnode_get_next_child_node()

On Tuesday, June 30, 2015 04:55:05 PM Tomeu Vizoso wrote:
> So callers that have a handle to a firmware node but not any of the
> devices related to it can iterate over their descendants.
> 
> Also adds fwnode_for_each_child_node().
> 
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>

Looks OK to me.


> ---
> 
>  drivers/base/property.c  | 30 ++++++++++++++++++++++--------
>  include/linux/property.h |  7 +++++++
>  2 files changed, 29 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index 3280b04..92cdbb3 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -466,28 +466,42 @@ int fwnode_property_read_string(struct fwnode_handle *fwnode,
>  EXPORT_SYMBOL_GPL(fwnode_property_read_string);
>  
>  /**
> - * device_get_next_child_node - Return the next child node handle for a device
> - * @dev: Device to find the next child node for.
> - * @child: Handle to one of the device's child nodes or a null handle.
> + * fwnode_get_next_child_node - Return the next child node handle for a fwnode
> + * @fwnode: Firmware node to find the next child node for.
> + * @child: Handle to one of the firmware node's child nodes or a null handle.
>   */
> -struct fwnode_handle *device_get_next_child_node(struct device *dev,
> +struct fwnode_handle *fwnode_get_next_child_node(struct fwnode_handle *fwnode,
>  						 struct fwnode_handle *child)
>  {
> -	if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
> +	if (is_of_node(fwnode)) {
>  		struct device_node *node;
>  
> -		node = of_get_next_available_child(dev->of_node, to_of_node(child));
> +		node = of_get_next_available_child(to_of_node(fwnode),
> +						   to_of_node(child));
>  		if (node)
>  			return &node->fwnode;
> -	} else if (IS_ENABLED(CONFIG_ACPI)) {
> +	} else if (is_acpi_node(fwnode)) {
>  		struct acpi_device *node;
>  
> -		node = acpi_get_next_child(dev, to_acpi_node(child));
> +		node = acpi_dev_get_next_child(to_acpi_node(fwnode),
> +					       to_acpi_node(child));
>  		if (node)
>  			return acpi_fwnode_handle(node);
>  	}
>  	return NULL;
>  }
> +EXPORT_SYMBOL_GPL(fwnode_get_next_child_node);
> +
> +/**
> + * device_get_next_child_node - Return the next child node handle for a device
> + * @dev: Device to find the next child node for.
> + * @child: Handle to one of the device's child nodes or a null handle.
> + */
> +struct fwnode_handle *device_get_next_child_node(struct device *dev,
> +						 struct fwnode_handle *child)
> +{
> +	return fwnode_get_next_child_node(dev->fwnode, child);
> +}
>  EXPORT_SYMBOL_GPL(device_get_next_child_node);
>  
>  /**
> diff --git a/include/linux/property.h b/include/linux/property.h
> index 020a53c..cfd1eb2 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -63,6 +63,9 @@ int fwnode_property_read_string(struct fwnode_handle *fwnode,
>  struct fwnode_handle *device_get_next_child_node(struct device *dev,
>  						 struct fwnode_handle *child);
>  
> +struct fwnode_handle *fwnode_get_next_child_node(struct fwnode_handle *fwnode,
> +						 struct fwnode_handle *child);
> +
>  struct fwnode_handle *fwnode_get_parent(struct fwnode_handle *fwnode);
>  
>  const char *fwnode_get_name(struct fwnode_handle *fwnode);
> @@ -71,6 +74,10 @@ const char *fwnode_get_name(struct fwnode_handle *fwnode);
>  	for (child = device_get_next_child_node(dev, NULL); child; \
>  	     child = device_get_next_child_node(dev, child))
>  
> +#define fwnode_for_each_child_node(fwnode, child) \
> +	for (child = fwnode_get_next_child_node(fwnode, NULL); child; \
> +	     child = fwnode_get_next_child_node(fwnode, child))
> +
>  void fwnode_handle_put(struct fwnode_handle *fwnode);
>  
>  unsigned int device_get_child_node_count(struct device *dev);
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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