#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);