v4.19.13 snapshot.
diff --git a/arch/sparc/kernel/prom_common.c b/arch/sparc/kernel/prom_common.c
new file mode 100644
index 0000000..79cc0d1
--- /dev/null
+++ b/arch/sparc/kernel/prom_common.c
@@ -0,0 +1,162 @@
+/* prom_common.c: OF device tree support common code.
+ *
+ * Paul Mackerras August 1996.
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ *
+ * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
+ * {engebret|bergner}@us.ibm.com
+ *
+ * Adapted for sparc by David S. Miller davem@davemloft.net
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/errno.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_pdt.h>
+#include <asm/prom.h>
+#include <asm/oplib.h>
+
+#include "prom.h"
+
+struct device_node *of_console_device;
+EXPORT_SYMBOL(of_console_device);
+
+char *of_console_path;
+EXPORT_SYMBOL(of_console_path);
+
+char *of_console_options;
+EXPORT_SYMBOL(of_console_options);
+
+int of_getintprop_default(struct device_node *np, const char *name, int def)
+{
+ struct property *prop;
+ int len;
+
+ prop = of_find_property(np, name, &len);
+ if (!prop || len != 4)
+ return def;
+
+ return *(int *) prop->value;
+}
+EXPORT_SYMBOL(of_getintprop_default);
+
+DEFINE_MUTEX(of_set_property_mutex);
+EXPORT_SYMBOL(of_set_property_mutex);
+
+int of_set_property(struct device_node *dp, const char *name, void *val, int len)
+{
+ struct property **prevp;
+ unsigned long flags;
+ void *new_val;
+ int err;
+
+ new_val = kmemdup(val, len, GFP_KERNEL);
+ if (!new_val)
+ return -ENOMEM;
+
+ err = -ENODEV;
+
+ mutex_lock(&of_set_property_mutex);
+ raw_spin_lock_irqsave(&devtree_lock, flags);
+ prevp = &dp->properties;
+ while (*prevp) {
+ struct property *prop = *prevp;
+
+ if (!strcasecmp(prop->name, name)) {
+ void *old_val = prop->value;
+ int ret;
+
+ ret = prom_setprop(dp->phandle, name, val, len);
+
+ err = -EINVAL;
+ if (ret >= 0) {
+ prop->value = new_val;
+ prop->length = len;
+
+ if (OF_IS_DYNAMIC(prop))
+ kfree(old_val);
+
+ OF_MARK_DYNAMIC(prop);
+
+ err = 0;
+ }
+ break;
+ }
+ prevp = &(*prevp)->next;
+ }
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ mutex_unlock(&of_set_property_mutex);
+
+ /* XXX Upate procfs if necessary... */
+
+ return err;
+}
+EXPORT_SYMBOL(of_set_property);
+
+int of_find_in_proplist(const char *list, const char *match, int len)
+{
+ while (len > 0) {
+ int l;
+
+ if (!strcmp(list, match))
+ return 1;
+ l = strlen(list) + 1;
+ list += l;
+ len -= l;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(of_find_in_proplist);
+
+/*
+ * SPARC32 and SPARC64's prom_nextprop() do things differently
+ * here, despite sharing the same interface. SPARC32 doesn't fill in 'buf',
+ * returning NULL on an error. SPARC64 fills in 'buf', but sets it to an
+ * empty string upon error.
+ */
+static int __init handle_nextprop_quirks(char *buf, const char *name)
+{
+ if (!name || strlen(name) == 0)
+ return -1;
+
+#ifdef CONFIG_SPARC32
+ strcpy(buf, name);
+#endif
+ return 0;
+}
+
+static int __init prom_common_nextprop(phandle node, char *prev, char *buf)
+{
+ const char *name;
+
+ buf[0] = '\0';
+ name = prom_nextprop(node, prev, buf);
+ return handle_nextprop_quirks(buf, name);
+}
+
+unsigned int prom_early_allocated __initdata;
+
+static struct of_pdt_ops prom_sparc_ops __initdata = {
+ .nextprop = prom_common_nextprop,
+ .getproplen = prom_getproplen,
+ .getproperty = prom_getproperty,
+ .getchild = prom_getchild,
+ .getsibling = prom_getsibling,
+};
+
+void __init prom_build_devicetree(void)
+{
+ of_pdt_build_devicetree(prom_root_node, &prom_sparc_ops);
+ of_console_init();
+
+ pr_info("PROM: Built device tree with %u bytes of memory.\n",
+ prom_early_allocated);
+}