Consolidate of_find_property

[karo-tx-linux.git] / arch / powerpc / kernel / prom_parse.c

diff --git a/arch/powerpc/kernel/prom_parse.c b/arch/powerpc/kernel/prom_parse.c
index aa40a5307294b2a8442a3f4de0990386065c6b3f..3786dcc8a7b62752cc51ddd3fae9dd085a2b3726 100644 (file)
--- a/arch/powerpc/kernel/prom_parse.c
+++ b/arch/powerpc/kernel/prom_parse.c
@@ -24,7 +24,7 @@
 /* Max address size we deal with */
 #define OF_MAX_ADDR_CELLS      4
 #define OF_CHECK_COUNTS(na, ns)        ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
-                       (ns) > 0)
+                       (ns) >= 0)
 
 static struct of_bus *of_match_bus(struct device_node *np);
 static int __of_address_to_resource(struct device_node *dev,
@@ -1042,3 +1042,28 @@ const void *of_get_mac_address(struct device_node *np)
 }
 EXPORT_SYMBOL(of_get_mac_address);
 
+int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
+{
+       int irq = irq_of_parse_and_map(dev, index);
+
+       /* Only dereference the resource if both the
+        * resource and the irq are valid. */
+       if (r && irq != NO_IRQ) {
+               r->start = r->end = irq;
+               r->flags = IORESOURCE_IRQ;
+       }
+
+       return irq;
+}
+EXPORT_SYMBOL_GPL(of_irq_to_resource);
+
+void __iomem *of_iomap(struct device_node *np, int index)
+{
+       struct resource res;
+
+       if (of_address_to_resource(np, index, &res))
+               return NULL;
+
+       return ioremap(res.start, 1 + res.end - res.start);
+}
+EXPORT_SYMBOL(of_iomap);