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dt: add helper functions to read u32 and string property values

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Add helper functions to retrieve unsigned integer and string property
values from properties of a device node. These helper functions can be
used to lookup a property in a device node, perform error checking and
read the property value.

[grant.likely@secretlab.ca: Proposal and initial implementation]
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
[grant.likely: some word smithing and be more defensive validating the string]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Thomas Abraham
2011-06-30 21:26:10 +05:30
committed by Grant Likely
parent 7423734e19
commit a3b853633d
2 changed files with 62 additions and 0 deletions
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4
include/linux/of.h
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@@ -195,6 +195,10 @@ 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_string(struct device_node *np, char *propname,
char **out_string);
extern int of_device_is_compatible(const struct device_node *device,
const char *);
extern int of_device_is_available(const struct device_node *device);