[PATCHv3] dt: add helper to read 64-bit integers

[Jamie Iles]

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 at secretlab.ca>
Reviewed-by: Rob Herring <rob.herring at calxeda.com>
Signed-off-by: Jamie Iles <jamie at jamieiles.com>
---

Just a resend but with Rob's Reviewed-by added since it was a while
since last posted.

 drivers/of/base.c  |   29 +++++++++++++++++++++++++++++
 include/linux/of.h |    8 ++++++++
 2 files changed, 37 insertions(+), 0 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 3ff22e3..9361cfe 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -632,6 +632,35 @@ 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.
diff --git a/include/linux/of.h b/include/linux/of.h
index 9180dc5..dc5995e 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -199,6 +199,8 @@ 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,
@@ -263,6 +265,12 @@ 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;
+}
+
 #endif /* CONFIG_OF */
 
 static inline int of_property_read_u32(const struct device_node *np,
-- 
1.7.4.1