[SPARC64]: Add of_getintprop_default().

This encodes a common idiomatic coding pattern used when
dealing with integer properties.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc64/kernel/prom.c

@@ -104,6 +104,18 @@ struct property *of_find_property(struct device_node *np, const char *name,
 	return pp;
 }
 
+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;
+}
+
 static unsigned int prom_early_allocated;
 
 static void * __init prom_early_alloc(unsigned long size)

include/asm-sparc64/prom.h

@@ -82,6 +82,9 @@ extern struct device_node *of_get_next_child(const struct device_node *node,
 extern struct property *of_find_property(struct device_node *np,
 					 const char *name,
 					 int *lenp);
+extern int of_getintprop_default(struct device_node *np,
+				 const char *name,
+				 int def);
 
 extern void prom_build_devicetree(void);