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dm: core: Add ofnode_read_string_count()

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This provides a way to find the number of strings in a string list. Add it
and also fix up the comment for ofnode_read_string_index().

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Tested-on: Beaver, Jetson-TK1
This commit is contained in:
Simon Glass 2017-06-12 06:21:28 -06:00
parent 7feccfdc45
commit 8c293d6ac9
3 changed files with 39 additions and 1 deletions
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10
drivers/core/ofnode.c
View file

@ -260,6 +260,16 @@ int ofnode_read_string_index(ofnode node, const char *property, int index,
}
}
int ofnode_read_string_count(ofnode node, const char *property)
{
if (ofnode_is_np(node)) {
return of_property_count_strings(ofnode_to_np(node), property);
} else {
return fdt_stringlist_count(gd->fdt_blob,
ofnode_to_offset(node), property);
}
}
static void ofnode_from_fdtdec_phandle_args(struct fdtdec_phandle_args *in,
struct ofnode_phandle_args *out)
{

18
include/dm/of_access.h
View file

@ -260,6 +260,24 @@ static inline int of_property_read_string_index(const struct device_node *np,
return rc < 0 ? rc : 0;
}
/**
* of_property_count_strings() - Find and return the number of strings from a
* multiple strings property.
* @np: device node from which the property value is to be read.
* @propname: name of the property to be searched.
*
* Search for a property in a device tree node and retrieve the number of null
* terminated string contain in it. Returns the number of strings on
* success, -EINVAL if the property does not exist, -ENODATA if property
* does not have a value, and -EILSEQ if the string is not null-terminated
* within the length of the property data.
*/
static inline int of_property_count_strings(const struct device_node *np,
const char *propname)
{
return of_property_read_string_helper(np, propname, NULL, 0, 0);
}
/**
* of_parse_phandle - Resolve a phandle property to a device_node pointer
* @np: Pointer to device node holding phandle property

12
include/dm/ofnode.h
View file

@ -359,7 +359,7 @@ int ofnode_stringlist_search(ofnode node, const char *propname,
const char *string);
/**
* fdt_stringlist_get() - obtain the string at a given index in a string list
* ofnode_read_string_index() - obtain an indexed string from a string list
*
* Note that this will successfully extract strings from properties with
* non-NUL-terminated values. For example on small-valued cell properties
@ -379,6 +379,16 @@ int ofnode_stringlist_search(ofnode node, const char *propname,
int ofnode_read_string_index(ofnode node, const char *propname, int index,
const char **outp);
/**
* ofnode_read_string_count() - find the number of strings in a string list
*
* @node: node to check
* @propname: name of the property containing the string list
* @return:
* number of strings in the list, or -ve error value if not found
*/
int ofnode_read_string_count(ofnode node, const char *property);
/**
* ofnode_parse_phandle_with_args() - Find a node pointed by phandle in a list
*