v4.19.13 snapshot.
diff --git a/arch/mips/ath79/common.h b/arch/mips/ath79/common.h
new file mode 100644
index 0000000..870c6b2
--- /dev/null
+++ b/arch/mips/ath79/common.h
@@ -0,0 +1,29 @@
+/*
+ * Atheros AR71XX/AR724X/AR913X common definitions
+ *
+ * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ *
+ * Parts of this file are based on Atheros' 2.6.15 BSP
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#ifndef __ATH79_COMMON_H
+#define __ATH79_COMMON_H
+
+#include <linux/types.h>
+
+#define ATH79_MEM_SIZE_MIN (2 * 1024 * 1024)
+#define ATH79_MEM_SIZE_MAX (256 * 1024 * 1024)
+
+void ath79_clocks_init(void);
+unsigned long ath79_get_sys_clk_rate(const char *id);
+
+void ath79_ddr_ctrl_init(void);
+
+void ath79_gpio_init(void);
+
+#endif /* __ATH79_COMMON_H */