backports: Add device_get_mac_address()

This was added in upstream commit 4c96b7dc0d39 ("Add a matching set of
device_ functions for determining mac/phy") and is used by ath10k now.
In the mainline kernel it uses device_property_read_u8_array(), but that
was only introduced in kernel 3.18, use of_property_read_u8_array() only
on all kernel versions where this backport is needed which was added
much earlier.

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

1 files changed, 15 insertions, 0 deletions

diff --git a/backport/backport-include/linux/property.h b/backport/backport-include/linux/property.h
new file mode 100644
index 00000000..a0d7bed1
--- /dev/null
+++ b/backport/backport-include/linux/property.h
@@ -0,0 +1,15 @@
+#ifndef __BACKPORT_LINUX_PROPERTY_H_
+#define __BACKPORT_LINUX_PROPERTY_H_
+#include <linux/version.h>
+#if LINUX_VERSION_IS_GEQ(3,18,17)
+#include_next <linux/property.h>
+#endif
+
+#if LINUX_VERSION_IS_LESS(4,3,0)
+
+#define device_get_mac_address LINUX_BACKPORT(device_get_mac_address)
+void *device_get_mac_address(struct device *dev, char *addr, int alen);
+
+#endif /* < 4.3 */
+
+#endif /* __BACKPORT_LINUX_PROPERTY_H_ */