powerpc/pci: Hide pci_device_from_OF_node() for non-powermac code

Function pci_device_from_OF_node() is used only in powermac code. So
hide it from all other platforms.
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220706104308.5390-2-pali@kernel.org

arch/powerpc/include/asm/pci-bridge.h

@@ -170,8 +170,10 @@ static inline struct pci_controller *pci_bus_to_host(const struct pci_bus *bus)
 	return bus->sysdata;
 }
 
+#ifdef CONFIG_PPC_PMAC
 extern int pci_device_from_OF_node(struct device_node *node,
 				   u8 *bus, u8 *devfn);
+#endif
 #ifndef CONFIG_PPC64
 
 extern void pci_create_OF_bus_map(void);

arch/powerpc/kernel/pci_32.c

@@ -154,6 +154,7 @@ pcibios_make_OF_bus_map(void)
 }
 
 
+#ifdef CONFIG_PPC_PMAC
 /*
  * Returns the PCI device matching a given OF node
  */
@@ -193,6 +194,7 @@ int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
 	return -ENODEV;
 }
 EXPORT_SYMBOL(pci_device_from_OF_node);
+#endif
 
 /* We create the "pci-OF-bus-map" property now so it appears in the
  * /proc device tree

arch/powerpc/kernel/pci_64.c

@@ -286,6 +286,7 @@ int pcibus_to_node(struct pci_bus *bus)
 EXPORT_SYMBOL(pcibus_to_node);
 #endif
 
+#ifdef CONFIG_PPC_PMAC
 int pci_device_from_OF_node(struct device_node *np, u8 *bus, u8 *devfn)
 {
 	if (!PCI_DN(np))
@@ -294,3 +295,4 @@ int pci_device_from_OF_node(struct device_node *np, u8 *bus, u8 *devfn)
 	*devfn = PCI_DN(np)->devfn;
 	return 0;
 }
+#endif