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dt: add helper function to read u32 arrays

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Rework of_property_read_u32 to read an array of values. Then
of_property_read_u32 becomes an inline with array size of 1.

Also make struct device_node ptr const.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Rob Herring 2011-07-06 15:42:58 -05:00 committed by Grant Likely
parent b84e773119
commit 0e373639ad
2 changed files with 25 additions and 8 deletions
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19
drivers/of/base.c
View File

@ -596,32 +596,39 @@ struct device_node *of_find_node_by_phandle(phandle handle)
EXPORT_SYMBOL(of_find_node_by_phandle);
/**
* of_property_read_u32 - Find and read a 32 bit integer from a property
* of_property_read_u32_array - Find and read an array of 32 bit integers
* from a property.
*
* @np: device node from which the property value is to be read.
* @propname: name of the property to be searched.
* @out_value: pointer to return value, modified only if return value is 0.
*
* Search for a property in a device node and read a 32-bit value from
* Search for a property in a device node and read 32-bit value(s) from
* it. Returns 0 on success, -EINVAL if the property does not exist,
* -ENODATA if property does not have a value, and -EOVERFLOW if the
* property data isn't large enough.
*
* The out_value is modified only if a valid u32 value can be decoded.
*/
int of_property_read_u32(struct device_node *np, char *propname, u32 *out_value)
int of_property_read_u32_array(const struct device_node *np, char *propname,
u32 *out_values, size_t sz)
{
struct property *prop = of_find_property(np, propname, NULL);
const __be32 *val;
if (!prop)
return -EINVAL;
if (!prop->value)
return -ENODATA;
if (sizeof(*out_value) > prop->length)
if ((sz * sizeof(*out_values)) > prop->length)
return -EOVERFLOW;
*out_value = be32_to_cpup(prop->value);
val = prop->value;
while (sz--)
*out_values++ = be32_to_cpup(val++);
return 0;
}
EXPORT_SYMBOL_GPL(of_property_read_u32);
EXPORT_SYMBOL_GPL(of_property_read_u32_array);
/**
* of_property_read_string - Find and read a string from a property

14
include/linux/of.h
View File

@ -195,8 +195,18 @@ extern struct device_node *of_find_node_with_property(
extern struct property *of_find_property(const struct device_node *np,
const char *name,
int *lenp);
extern int of_property_read_u32(struct device_node *np, char *propname,
u32 *out_value);
extern int of_property_read_u32_array(const struct device_node *np,
char *propname,
u32 *out_values,
size_t sz);
static inline int of_property_read_u32(const struct device_node *np,
char *propname,
u32 *out_value)
{
return of_property_read_u32_array(np, propname, out_value, 1);
}
extern int of_property_read_string(struct device_node *np, char *propname,
const char **out_string);
extern int of_device_is_compatible(const struct device_node *device,