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Commit 4cd7f7a3 authored by Jamie Iles's avatar Jamie Iles Committed by Grant Likely
Browse files

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: default avatarRob Herring <rob.herring@calxeda.com>
Signed-off-by: default avatarJamie Iles <jamie@jamieiles.com>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 85888069

drivers/of/base.c

+29 −0
Original line number Diff line number Diff line
@@ -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.

include/linux/of.h

+8 −0
Original line number Diff line number Diff line
@@ -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 */