This function was added in commit b31384fa5 "Driver core: Unified
device properties interface for platform firmware".
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/linux/of.h | 17 +++++++++++++++++
backport/compat/backport-3.18.c | 37 ++++++++++++++++++++++++++++++++++++
2 files changed, 54 insertions(+)
diff --git a/backport/backport-include/linux/of.h b/backport/backport-include/linux/of.h
index ef9c6aa..bc0d7fd 100644
--- a/backport/backport-include/linux/of.h
+++ b/backport/backport-include/linux/of.h
@@ -167,4 +167,21 @@ static inline struct device_node *of_find_compatible_node(
#endif
#endif
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
+#define of_property_read_u64_array LINUX_BACKPORT(of_property_read_u64_array)
+#ifdef CONFIG_OF
+extern int of_property_read_u64_array(const struct device_node *np,
+ const char *propname,
+ u64 *out_values,
+ size_t sz);
+#else
+static inline int of_property_read_u64_array(const struct device_node *np,
+ const char *propname,
+ u64 *out_values, size_t sz)
+{
+ return -ENOSYS;
+}
+#endif /* CONFIG_OF */
+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) */
+
#endif /* _COMPAT_LINUX_OF_H */
diff --git a/backport/compat/backport-3.18.c b/backport/compat/backport-3.18.c
index 9e1a026..bed5d96 100644
--- a/backport/compat/backport-3.18.c
+++ b/backport/compat/backport-3.18.c
@@ -15,6 +15,7 @@
#include <linux/skbuff.h>
#include <linux/errqueue.h>
#include <linux/wait.h>
+#include <linux/of.h>
/**
* eth_get_headlen - determine the the length of header for an ethernet frame
@@ -221,3 +222,39 @@ __sched int bit_wait_timeout(struct wait_bit_key *word)
}
EXPORT_SYMBOL_GPL(bit_wait_timeout);
#endif
+
+#ifdef CONFIG_OF
+/**
+ * of_property_read_u64_array - Find and read an array of 64 bit integers
+ * from a property.
+ *
+ * @np: device node from which the property value is to be read.
+ * @propname: name of the property to be searched.
+ * @out_values: pointer to return value, modified only if return value is 0.
+ * @sz: number of array elements to read
+ *
+ * Search for a property in a device node and read 64-bit value(s) 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_values is modified only if a valid u64 value can be decoded.
+ */
+int of_property_read_u64_array(const struct device_node *np,
+ const char *propname, u64 *out_values,
+ size_t sz)
+{
+ const __be32 *val = of_find_property_value_of_size(np, propname,
+ (sz * sizeof(*out_values)));
+
+ if (IS_ERR(val))
+ return PTR_ERR(val);
+
+ while (sz--) {
+ *out_values++ = of_read_number(val, 2);
+ val += 2;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_property_read_u64_array);
+#endif /* CONFIG_OF */
--
2.6.2
--
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