v4.19.13 snapshot.
diff --git a/arch/mips/kernel/prom.c b/arch/mips/kernel/prom.c
new file mode 100644
index 0000000..89950b7
--- /dev/null
+++ b/arch/mips/kernel/prom.c
@@ -0,0 +1,81 @@
+/*
+ * MIPS support for CONFIG_OF device tree support
+ *
+ * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/export.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/bootmem.h>
+#include <linux/debugfs.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+
+#include <asm/bootinfo.h>
+#include <asm/page.h>
+#include <asm/prom.h>
+
+static char mips_machine_name[64] = "Unknown";
+
+__init void mips_set_machine_name(const char *name)
+{
+ if (name == NULL)
+ return;
+
+ strlcpy(mips_machine_name, name, sizeof(mips_machine_name));
+ pr_info("MIPS: machine is %s\n", mips_get_machine_name());
+}
+
+char *mips_get_machine_name(void)
+{
+ return mips_machine_name;
+}
+
+#ifdef CONFIG_USE_OF
+void __init early_init_dt_add_memory_arch(u64 base, u64 size)
+{
+ return add_memory_region(base, size, BOOT_MEM_RAM);
+}
+
+int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
+ phys_addr_t size, bool nomap)
+{
+ add_memory_region(base, size, BOOT_MEM_RESERVED);
+ return 0;
+}
+
+void __init __dt_setup_arch(void *bph)
+{
+ if (!early_init_dt_scan(bph))
+ return;
+
+ mips_set_machine_name(of_flat_dt_get_machine_name());
+}
+
+int __init __dt_register_buses(const char *bus0, const char *bus1)
+{
+ static struct of_device_id of_ids[3];
+
+ if (!of_have_populated_dt())
+ panic("device tree not present");
+
+ strlcpy(of_ids[0].compatible, bus0, sizeof(of_ids[0].compatible));
+ if (bus1) {
+ strlcpy(of_ids[1].compatible, bus1,
+ sizeof(of_ids[1].compatible));
+ }
+
+ if (of_platform_populate(NULL, of_ids, NULL, NULL))
+ panic("failed to populate DT");
+
+ return 0;
+}
+
+#endif