From 4cd7f7a31178ff8a15ad2bc1258b9b2bf2cf51a4 Mon Sep 17 00:00:00 2001 From: Jamie Iles Date: Wed, 14 Sep 2011 20:49:59 +0100 Subject: 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 Reviewed-by: Rob Herring Signed-off-by: Jamie Iles Signed-off-by: Grant Likely --- drivers/of/base.c | 29 +++++++++++++++++++++++++++++ include/linux/of.h | 8 ++++++++ 2 files changed, 37 insertions(+) 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 @@ -656,6 +656,35 @@ 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. diff --git a/include/linux/of.h b/include/linux/of.h index 53107b09cbd..1cc9930ba06 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -200,6 +200,8 @@ extern int of_property_read_u32_array(const struct device_node *np, const char *propname, u32 *out_values, size_t sz); +extern int of_property_read_u64(const struct device_node *np, + const char *propname, u64 *out_value); extern int of_property_read_string(struct device_node *np, const char *propname, @@ -281,6 +283,12 @@ static inline const void *of_get_property(const struct device_node *node, return NULL; } +static inline int of_property_read_u64(const struct device_node *np, + const char *propname, u64 *out_value) +{ + return -ENOSYS; +} + #define of_match_ptr(_ptr) NULL #endif /* CONFIG_OF */ -- cgit v1.2.3