zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/of/of_pci.c b/ap/os/linux/linux-3.4.x/drivers/of/of_pci.c
new file mode 100644
index 0000000..13e37e2
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/of/of_pci.c
@@ -0,0 +1,42 @@
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/of.h>
+#include <linux/of_pci.h>
+#include <asm/prom.h>
+
+static inline int __of_pci_pci_compare(struct device_node *node,
+ unsigned int devfn)
+{
+ unsigned int size;
+ const __be32 *reg = of_get_property(node, "reg", &size);
+
+ if (!reg || size < 5 * sizeof(__be32))
+ return 0;
+ return ((be32_to_cpup(®[0]) >> 8) & 0xff) == devfn;
+}
+
+struct device_node *of_pci_find_child_device(struct device_node *parent,
+ unsigned int devfn)
+{
+ struct device_node *node, *node2;
+
+ for_each_child_of_node(parent, node) {
+ if (__of_pci_pci_compare(node, devfn))
+ return node;
+ /*
+ * Some OFs create a parent node "multifunc-device" as
+ * a fake root for all functions of a multi-function
+ * device we go down them as well.
+ */
+ if (!strcmp(node->name, "multifunc-device")) {
+ for_each_child_of_node(node, node2) {
+ if (__of_pci_pci_compare(node2, devfn)) {
+ of_node_put(node);
+ return node2;
+ }
+ }
+ }
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(of_pci_find_child_device);