[PATCH 1/4] of: add helpers to get alias from device node path + property name

[Ahmad Fatoum]

On 15.11.24 12:57, Ahmad Fatoum wrote:
> The existing of_find_device and of_find_path helpers require that
> barebox has already probed devices. For use in code where this
> assumption doesn't always hold true, let's add helpers that return
> the alias if it exists.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>

Please dismiss. Forgot to squash fixups :/

> ---
>  drivers/of/base.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++
>  include/of.h      | 32 ++++++++++++++++++++++++++
>  2 files changed, 89 insertions(+)
> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 960a9327aed2..0d04bd3ce25b 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -318,6 +318,63 @@ const char *of_alias_get(struct device_node *np)
>  }
>  EXPORT_SYMBOL_GPL(of_alias_get);
>  
> +static const char *of_get_partition_device_alias(struct device_node *np)
> +{
> +	const char *alias;
> +
> +	alias = of_alias_get(np);
> +	if (alias)
> +		return alias;
> +
> +	np = of_get_parent(np);
> +	if (np && of_device_is_compatible(np, "fixed-partitions"))
> +		np = of_get_parent(np);
> +
> +	return of_alias_get(np);
> +}
> +
> +const char *of_property_get_alias_from(struct device_node *root,
> +				       const char *np_name, const char *propname,
> +				       int index)
> +{
> +	struct device_node *node, *rnode;
> +	const char *path;
> +	int ret;
> +
> +	node = of_find_node_by_path_or_alias(root, np_name);
> +	if (!node)
> +		return NULL;
> +
> +	ret = of_property_read_string_index(root, propname, index, &path);
> +	if (ret < 0)
> +		return NULL;
> +
> +	rnode = of_find_node_by_path(path);
> +	if (!rnode)
> +		return NULL;
> +
> +	return of_get_partition_device_alias(rnode);
> +}
> +EXPORT_SYMBOL_GPL(of_property_get_alias_from);
> +
> +const char *of_parse_phandle_and_get_alias_from(struct device_node *root,
> +						const char *np_name, const char *phandle_name,
> +						int index)
> +{
> +	struct device_node *node, *rnode;
> +
> +	node = of_find_node_by_path_or_alias(root, np_name);
> +	if (!node)
> +		return NULL;
> +
> +	rnode = of_parse_phandle_from(node, root, phandle_name, index);
> +	if (!node)
> +		return NULL;
> +
> +	return of_get_partition_device_alias(rnode);
> +}
> +EXPORT_SYMBOL_GPL(of_parse_phandle_and_get_alias_from);
> +
>  /*
>   * of_find_node_by_alias - Find a node given an alias name
>   * @root:    the root node of the tree. If NULL, use internal tree
> diff --git a/include/of.h b/include/of.h
> index 3f5e5f9b04bb..e93b1bbf2f0a 100644
> --- a/include/of.h
> +++ b/include/of.h
> @@ -314,6 +314,14 @@ extern int of_alias_get_id_from(struct device_node *root, struct device_node *np
>  extern const char *of_alias_get(struct device_node *np);
>  extern int of_modalias_node(struct device_node *node, char *modalias, int len);
>  
> +extern const char *of_property_get_alias_from(struct device_node *root,
> +					      const char *np_name, const char *propname,
> +					      int index);
> +
> +extern const char *of_parse_phandle_and_get_alias_from(struct device_node *root,
> +						       const char *np_name, const char *phandle_name,
> +						       int index);
> +
>  extern struct device_node *of_get_root_node(void);
>  extern int of_set_root_node(struct device_node *node);
>  extern int barebox_register_of(struct device_node *root);
> @@ -944,6 +952,20 @@ static inline int of_modalias_node(struct device_node *node, char *modalias,
>  	return -ENOSYS;
>  }
>  
> +static inline const char *of_property_get_alias_from(struct device_node *root,
> +						     const char *np_name, const char *propname,
> +						     int index)
> +{
> +	return NULL;
> +}
> +
> +static inline const char *of_parse_phandle_and_get_alias_from(struct device_node *root,
> +							      const char *np_name, const char *phandle_name,
> +							      int index)
> +{
> +	return NULL;
> +}
> +
>  static inline int of_platform_populate(struct device_node *root,
>  				const struct of_device_id *matches,
>  				struct device *parent)
> @@ -1275,6 +1297,16 @@ static inline void of_delete_property_by_name(struct device_node *np, const char
>  	of_delete_property(of_find_property(np, name, NULL));
>  }
>  
> +static inline const char *of_property_get_alias(const char *np_name, const char *propname)
> +{
> +	return of_property_get_alias_from(NULL, np_name, propname, 0);
> +}
> +
> +static inline const char *of_parse_phandle_and_get_alias(const char *np_name, const char *phandle_name)
> +{
> +	return of_parse_phandle_and_get_alias_from(NULL, np_name, phandle_name, 0);
> +}
> +
>  extern const struct of_device_id of_default_bus_match_table[];
>  
>  int of_device_enable(struct device_node *node);


-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |