ARM: convert arch_fixup_memory_node to a generic FDT fixup function

Some architecture needs extra device tree setup. Instead of adding
yet another hook, convert arch_fixup_memory_node to be a generic
FDT fixup function.

[maz: collapsed 3 patches into one, rewrote commit message]

Signed-off-by: Ma Haijun <mahaijuns@gmail.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

arch/arm/lib/bootm-fdt.c

@@ -20,7 +20,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-int arch_fixup_memory_node(void *blob)
+int arch_fixup_fdt(void *blob)
 {
 	bd_t *bd = gd->bd;
 	int bank;

arch/arm/lib/bootm.c

@@ -359,7 +359,7 @@ void boot_prep_vxworks(bootm_headers_t *images)
 	if (images->ft_addr) {
 		off = fdt_path_offset(images->ft_addr, "/memory");
 		if (off < 0) {
-			if (arch_fixup_memory_node(images->ft_addr))
+			if (arch_fixup_fdt(images->ft_addr))
 				puts("## WARNING: fixup memory failed!\n");
 		}
 	}

common/image-fdt.c

@@ -450,7 +450,7 @@ __weak int ft_verify_fdt(void *fdt)
 	return 1;
 }
 
-__weak int arch_fixup_memory_node(void *blob)
+__weak int arch_fixup_fdt(void *blob)
 {
 	return 0;
 }
@@ -467,7 +467,10 @@ int image_setup_libfdt(bootm_headers_t *images, void *blob,
 		puts(" - must RESET the board to recover.\n");
 		return -1;
 	}
-	arch_fixup_memory_node(blob);
+	if (arch_fixup_fdt(blob) < 0) {
+		puts("ERROR: arch specific fdt fixup failed");
+		return -1;
+	}
 	if (IMAGE_OF_BOARD_SETUP)
 		ft_board_setup(blob, gd->bd);
 	fdt_fixup_ethernet(blob);

include/common.h

@@ -318,14 +318,14 @@ int arch_early_init_r(void);
 void board_show_dram(ulong size);
 
 /**
- * arch_fixup_memory_node() - Write arch-specific memory information to fdt
+ * arch_fixup_fdt() - Write arch-specific information to fdt
  *
- * Defined in arch/$(ARCH)/lib/bootm.c
+ * Defined in arch/$(ARCH)/lib/bootm-fdt.c
  *
  * @blob:	FDT blob to write to
  * @return 0 if ok, or -ve FDT_ERR_... on failure
  */
-int arch_fixup_memory_node(void *blob);
+int arch_fixup_fdt(void *blob);
 
 /* common/flash.c */
 void flash_perror (int);