Re: [PATCH v3 04/10] device property: Add fwnode_get_name for returning the name of a node

[Andy Shevchenko]

On Thu, Aug 29, 2019 at 01:10:37PM +0300, Sakari Ailus wrote:
> The fwnode framework did not have means to obtain the name of a node. Add
> that now, in form of the fwnode_get_name() function and a corresponding
> get_name fwnode op. OF and ACPI support is included.
> 

Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>

> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> Acked-by: Rob Herring <robh@xxxxxxxxxx> (for OF)
> ---
>  drivers/acpi/property.c  | 26 ++++++++++++++++++++++++++
>  drivers/base/property.c  | 11 +++++++++++
>  drivers/base/swnode.c    | 20 ++++++++++++++++++++
>  drivers/of/property.c    |  6 ++++++
>  include/linux/fwnode.h   |  2 ++
>  include/linux/property.h |  1 +
>  6 files changed, 66 insertions(+)
> 
> diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
> index ea3d700da3ca6..5a9397a390f41 100644
> --- a/drivers/acpi/property.c
> +++ b/drivers/acpi/property.c
> @@ -1311,6 +1311,31 @@ acpi_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
>  						  args_count, args);
>  }
>  
> +static const char *acpi_fwnode_get_name(const struct fwnode_handle *fwnode)
> +{
> +	const struct acpi_device *adev;
> +	struct fwnode_handle *parent;
> +
> +	/* Is this the root node? */
> +	parent = fwnode_get_parent(fwnode);
> +	if (!parent)
> +		return "\\";
> +
> +	fwnode_handle_put(parent);
> +
> +	if (is_acpi_data_node(fwnode)) {
> +		const struct acpi_data_node *dn = to_acpi_data_node(fwnode);
> +
> +		return dn->name;
> +	}
> +
> +	adev = to_acpi_device_node(fwnode);
> +	if (WARN_ON(!adev))
> +		return NULL;
> +
> +	return acpi_device_bid(adev);
> +}
> +
>  static struct fwnode_handle *
>  acpi_fwnode_get_parent(struct fwnode_handle *fwnode)
>  {
> @@ -1351,6 +1376,7 @@ acpi_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
>  		.get_parent = acpi_node_get_parent,			\
>  		.get_next_child_node = acpi_get_next_subnode,		\
>  		.get_named_child_node = acpi_fwnode_get_named_child_node, \
> +		.get_name = acpi_fwnode_get_name,			\
>  		.get_reference_args = acpi_fwnode_get_reference_args,	\
>  		.graph_get_next_endpoint =				\
>  			acpi_graph_get_next_endpoint,			\
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index 006d631e1824d..ea7369e5fdc35 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -556,6 +556,17 @@ int device_add_properties(struct device *dev,
>  }
>  EXPORT_SYMBOL_GPL(device_add_properties);
>  
> +/**
> + * fwnode_get_name - Return the name of a node
> + * @fwnode: The firmware node
> + *
> + * Returns a pointer to the node name.
> + */
> +const char *fwnode_get_name(const struct fwnode_handle *fwnode)
> +{
> +	return fwnode_call_ptr_op(fwnode, get_name);
> +}
> +
>  /**
>   * fwnode_get_parent - Return parent firwmare node
>   * @fwnode: Firmware whose parent is retrieved
> diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
> index 951e7efd47c23..a4a0f5b80bad3 100644
> --- a/drivers/base/swnode.c
> +++ b/drivers/base/swnode.c
> @@ -515,6 +515,25 @@ static int software_node_read_string_array(const struct fwnode_handle *fwnode,
>  						propname, val, nval);
>  }
>  
> +static const char *
> +software_node_get_name(const struct fwnode_handle *fwnode)
> +{
> +	const struct software_node *softnode = to_software_node(fwnode);
> +	const struct swnode *swnode = software_node_to_swnode(softnode);
> +	struct fwnode_handle *parent;
> +
> +	if (!swnode)
> +		return "(null)";
> +
> +	parent = fwnode_get_parent(&swnode->fwnode);
> +	if (!parent)
> +		return "";
> +
> +	fwnode_handle_put(parent);
> +
> +	return kobject_name(&swnode->kobj);
> +}
> +
>  static struct fwnode_handle *
>  software_node_get_parent(const struct fwnode_handle *fwnode)
>  {
> @@ -615,6 +634,7 @@ static const struct fwnode_operations software_node_ops = {
>  	.property_present = software_node_property_present,
>  	.property_read_int_array = software_node_read_int_array,
>  	.property_read_string_array = software_node_read_string_array,
> +	.get_name = software_node_get_name,
>  	.get_parent = software_node_get_parent,
>  	.get_next_child_node = software_node_get_next_child,
>  	.get_named_child_node = software_node_get_named_child_node,
> diff --git a/drivers/of/property.c b/drivers/of/property.c
> index d7fa75e31f224..5bed634551ea6 100644
> --- a/drivers/of/property.c
> +++ b/drivers/of/property.c
> @@ -872,6 +872,11 @@ of_fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
>  		of_property_count_strings(node, propname);
>  }
>  
> +static const char *of_fwnode_get_name(const struct fwnode_handle *fwnode)
> +{
> +	return kbasename(to_of_node(fwnode)->full_name);
> +}
> +
>  static struct fwnode_handle *
>  of_fwnode_get_parent(const struct fwnode_handle *fwnode)
>  {
> @@ -993,6 +998,7 @@ const struct fwnode_operations of_fwnode_ops = {
>  	.property_present = of_fwnode_property_present,
>  	.property_read_int_array = of_fwnode_property_read_int_array,
>  	.property_read_string_array = of_fwnode_property_read_string_array,
> +	.get_name = of_fwnode_get_name,
>  	.get_parent = of_fwnode_get_parent,
>  	.get_next_child_node = of_fwnode_get_next_child_node,
>  	.get_named_child_node = of_fwnode_get_named_child_node,
> diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
> index a11c8c56c78b4..c331e0ef31e80 100644
> --- a/include/linux/fwnode.h
> +++ b/include/linux/fwnode.h
> @@ -56,6 +56,7 @@ struct fwnode_reference_args {
>   *				 otherwise.
>   * @property_read_string_array: Read an array of string properties. Return zero
>   *				on success, a negative error code otherwise.
> + * @get_name: Return the name of an fwnode.
>   * @get_parent: Return the parent of an fwnode.
>   * @get_next_child_node: Return the next child node in an iteration.
>   * @get_named_child_node: Return a child node with a given name.
> @@ -82,6 +83,7 @@ struct fwnode_operations {
>  	(*property_read_string_array)(const struct fwnode_handle *fwnode_handle,
>  				      const char *propname, const char **val,
>  				      size_t nval);
> +	const char *(*get_name)(const struct fwnode_handle *fwnode);
>  	struct fwnode_handle *(*get_parent)(const struct fwnode_handle *fwnode);
>  	struct fwnode_handle *
>  	(*get_next_child_node)(const struct fwnode_handle *fwnode,
> diff --git a/include/linux/property.h b/include/linux/property.h
> index 5450e7ec219ac..ebc5e2016bb66 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -80,6 +80,7 @@ struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
>  					    const char *name,
>  					    unsigned int index);
>  
> +const char *fwnode_get_name(const struct fwnode_handle *fwnode);
>  struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
>  struct fwnode_handle *fwnode_get_next_parent(
>  	struct fwnode_handle *fwnode);
> -- 
> 2.20.1
> 

-- 
With Best Regards,
Andy Shevchenko