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author | Jamie Iles <jamie@jamieiles.com> | 2011-09-14 20:49:59 +0100 |
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committer | Grant Likely <grant.likely@secretlab.ca> | 2011-10-04 16:59:53 -0600 |
commit | 4cd7f7a31178ff8a15ad2bc1258b9b2bf2cf51a4 (patch) | |
tree | 8cd16ff6014483e3249333816e3d6bf4a2a4cae2 /drivers/of/base.c | |
parent | 85888069cf5d0f21312e3ee730458a5e3a553509 (diff) | |
download | linux-3.10-4cd7f7a31178ff8a15ad2bc1258b9b2bf2cf51a4.tar.gz linux-3.10-4cd7f7a31178ff8a15ad2bc1258b9b2bf2cf51a4.tar.bz2 linux-3.10-4cd7f7a31178ff8a15ad2bc1258b9b2bf2cf51a4.zip |
dt: add helper to read 64-bit integers
Add a helper similar to of_property_read_u32() that handles 64-bit
integers.
v2/v3: constify device node and property name parameters.
Cc: Grant Likely <grant.likely@secretlab.ca>
Reviewed-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/of/base.c')
-rw-r--r-- | drivers/of/base.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index 8abde58cbe8..b970562e011 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -657,6 +657,35 @@ int of_property_read_u32_array(const struct device_node *np, EXPORT_SYMBOL_GPL(of_property_read_u32_array); /** + * of_property_read_u64 - Find and read a 64 bit integer 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 64-bit value 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 u64 value can be decoded. + */ +int of_property_read_u64(const struct device_node *np, const char *propname, + u64 *out_value) +{ + struct property *prop = of_find_property(np, propname, NULL); + + if (!prop) + return -EINVAL; + if (!prop->value) + return -ENODATA; + if (sizeof(*out_value) > prop->length) + return -EOVERFLOW; + *out_value = of_read_number(prop->value, 2); + return 0; +} +EXPORT_SYMBOL_GPL(of_property_read_u64); + +/** * of_property_read_string - Find and read a string from a property * @np: device node from which the property value is to be read. * @propname: name of the property to be searched. |