--- zzzz-none-000/linux-4.1.52/include/linux/ioport.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/include/linux/ioport.h	2022-03-02 11:37:13.000000000 +0000
@@ -138,6 +138,8 @@
 extern struct resource ioport_resource;
 extern struct resource iomem_resource;
 
+extern struct resource gpio_resource;
+
 extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
 extern int request_resource(struct resource *root, struct resource *new);
 extern int release_resource(struct resource *new);