backports: add of_property_count_u32_elems()

This is needed by drivers/regulator/gpio-regulator.c

This also adds of_property_count_elems_of_size()

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 35 insertions, 0 deletions

diff --git a/backport/backport-include/linux/of.h b/backport/backport-include/linux/of.h
index a4189bb6..10a3d11a 100644
--- a/backport/backport-include/linux/of.h
+++ b/backport/backport-include/linux/of.h
@@ -46,4 +46,39 @@ static inline int of_property_read_u8_array(const struct device_node *np,
 #endif /* CONFIG_OF */
 #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) */
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0)
+#define of_property_count_elems_of_size LINUX_BACKPORT(of_property_count_elems_of_size)
+#ifdef CONFIG_OF
+extern int of_property_count_elems_of_size(const struct device_node *np,
+				const char *propname, int elem_size);
+#else
+static inline int of_property_count_elems_of_size(const struct device_node *np,
+			const char *propname, int elem_size)
+{
+	return -ENOSYS;
+}
+#endif /* CONFIG_OF */
+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) */
+
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0)
+/**
+ * of_property_count_u32_elems - Count the number of u32 elements in a property
+ *
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ *
+ * Search for a property in a device node and count the number of u32 elements
+ * in it. Returns number of elements on sucess, -EINVAL if the property does
+ * not exist or its length does not match a multiple of u32 and -ENODATA if the
+ * property does not have a value.
+ */
+#define of_property_count_u32_elems LINUX_BACKPORT(of_property_count_u32_elems)
+static inline int of_property_count_u32_elems(const struct device_node *np,
+				const char *propname)
+{
+	return of_property_count_elems_of_size(np, propname, sizeof(u32));
+}
+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) */
+
 #endif	/* _COMPAT_LINUX_OF_H */