fdt: Allow libfdt to be used in SPL

Add an option to enable libfdt in SPL. This can be useful when decoding
FIT files in SPL.

We need to make sure this option is not enabled in SPL by this change.
Also this option needs to be enabled in host builds. Si add a new
IMAGE_USE_LIBFDT #define which can be used in files that are built on the
host but must also build for U-Boot and SPL.

Signed-off-by: Simon Glass <sjg@chromium.org>

common/Makefile

@@ -56,7 +56,7 @@ obj-$(CONFIG_ENV_IS_IN_UBI) += env_ubi.o
 obj-$(CONFIG_ENV_IS_NOWHERE) += env_nowhere.o
 
 obj-$(CONFIG_CMD_BEDBUG) += bedbug.o
-obj-$(CONFIG_OF_LIBFDT) += fdt_support.o
+obj-$(CONFIG_$(SPL_)OF_LIBFDT) += fdt_support.o
 
 obj-$(CONFIG_MII) += miiphyutil.o
 obj-$(CONFIG_CMD_MII) += miiphyutil.o
@@ -131,7 +131,7 @@ obj-y += malloc_simple.o
 endif
 obj-y += image.o
 obj-$(CONFIG_ANDROID_BOOT_IMAGE) += image-android.o
-obj-$(CONFIG_OF_LIBFDT) += image-fdt.o
+obj-$(CONFIG_$(SPL_)OF_LIBFDT) += image-fdt.o
 obj-$(CONFIG_$(SPL_)FIT) += image-fit.o
 obj-$(CONFIG_$(SPL_)FIT_SIGNATURE) += image-sig.o
 obj-$(CONFIG_IO_TRACE) += iotrace.o

common/bootm.c

@@ -234,7 +234,7 @@ int bootm_find_images(int flag, int argc, char * const argv[])
 		return 1;
 	}
 
-#if defined(CONFIG_OF_LIBFDT)
+#if IMAGE_ENABLE_OF_LIBFDT
 	/* find flattened device tree */
 	ret = boot_get_fdt(flag, argc, argv, IH_ARCH_DEFAULT, &images,
 			   &images.ft_addr, &images.ft_len);
@@ -644,7 +644,7 @@ int do_bootm_states(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 		}
 	}
 #endif
-#if defined(CONFIG_OF_LIBFDT) && defined(CONFIG_LMB)
+#if IMAGE_ENABLE_OF_LIBFDT && defined(CONFIG_LMB)
 	if (!ret && (states & BOOTM_STATE_FDT)) {
 		boot_fdt_add_mem_rsv_regions(&images->lmb, images->ft_addr);
 		ret = boot_relocate_fdt(&images->lmb, &images->ft_addr,

common/image.c

@@ -29,7 +29,7 @@
 #include <image.h>
 #include <mapmem.h>
 
-#if IMAGE_ENABLE_FIT || defined(CONFIG_OF_LIBFDT)
+#if IMAGE_ENABLE_FIT || IMAGE_ENABLE_OF_LIBFDT
 #include <libfdt.h>
 #include <fdt_support.h>
 #endif
@@ -762,7 +762,7 @@ int genimg_get_format(const void *img_addr)
 	if (image_check_magic(hdr))
 		return IMAGE_FORMAT_LEGACY;
 #endif
-#if IMAGE_ENABLE_FIT || defined(CONFIG_OF_LIBFDT)
+#if IMAGE_ENABLE_FIT || IMAGE_ENABLE_OF_LIBFDT
 	if (fdt_check_header(img_addr) == 0)
 		return IMAGE_FORMAT_FIT;
 #endif

include/common.h

@@ -596,12 +596,8 @@ void	upmconfig     (unsigned int, unsigned int *, unsigned int);
 ulong	get_tbclk     (void);
 void	reset_misc    (void);
 void	reset_cpu     (ulong addr);
-#if defined (CONFIG_OF_LIBFDT) && defined (CONFIG_OF_BOARD_SETUP)
 void ft_cpu_setup(void *blob, bd_t *bd);
-#ifdef CONFIG_PCI
 void ft_pci_setup(void *blob, bd_t *bd);
-#endif
-#endif
 
 void smp_set_core_boot_addr(unsigned long addr, int corenr);
 void smp_kick_all_cpus(void);
@@ -660,10 +656,8 @@ int get_serial_clock(void);
 #if defined(CONFIG_MPC85xx)
 typedef MPC85xx_SYS_INFO sys_info_t;
 void	get_sys_info  ( sys_info_t * );
-#  if defined(CONFIG_OF_LIBFDT)
-	void ft_fixup_cpu(void *, u64);
-	void ft_fixup_num_cores(void *);
-#  endif
+void ft_fixup_cpu(void *, u64);
+void ft_fixup_num_cores(void *);
 #endif
 #if defined(CONFIG_MPC86xx)
 typedef MPC86xx_SYS_INFO sys_info_t;

include/image.h

@@ -26,7 +26,8 @@ struct lmb;
 #include <sys/types.h>
 
 /* new uImage format support enabled on host */
-#define IMAGE_ENABLE_FIT		1
+#define IMAGE_ENABLE_FIT	1
+#define IMAGE_ENABLE_OF_LIBFDT	1
 #define CONFIG_FIT_VERBOSE	1 /* enable fit_format_{error,warning}() */
 
 #define IMAGE_ENABLE_IGNORE	0
@@ -42,7 +43,8 @@ struct lmb;
 #define IMAGE_ENABLE_IGNORE	1
 #define IMAGE_INDENT_STRING	"   "
 
-#define IMAGE_ENABLE_FIT		CONFIG_IS_ENABLED(FIT)
+#define IMAGE_ENABLE_FIT	CONFIG_IS_ENABLED(FIT)
+#define IMAGE_ENABLE_OF_LIBFDT	CONFIG_IS_ENABLED(OF_LIBFDT)
 
 #endif /* USE_HOSTCC */
 
@@ -103,12 +105,6 @@ struct lmb;
 # define IMAGE_ENABLE_RAMDISK_HIGH	0
 #endif
 
-#ifdef CONFIG_OF_LIBFDT
-# define IMAGE_ENABLE_OF_LIBFDT	1
-#else
-# define IMAGE_ENABLE_OF_LIBFDT	0
-#endif
-
 #ifdef CONFIG_SYS_BOOT_GET_CMDLINE
 # define IMAGE_BOOT_GET_CMDLINE		1
 #else

lib/Kconfig

@@ -138,6 +138,16 @@ config OF_LIBFDT
 	  particular compatible nodes. The library operates on a flattened
 	  version of the device tree.
 
+config SPL_OF_LIBFDT
+	bool "Enable the FDT library for SPL"
+	default y if SPL_OF_CONTROL
+	help
+	  This enables the FDT library (libfdt). It provides functions for
+	  accessing binary device tree images in memory, such as adding and
+	  removing notes and properties, scanning through the tree and finding
+	  particular compatible nodes. The library operates on a flattened
+	  version of the device tree.
+
 source lib/efi/Kconfig
 
 endmenu

lib/Makefile

@@ -14,8 +14,6 @@ obj-$(CONFIG_LZO) += lzo/
 obj-$(CONFIG_ZLIB) += zlib/
 obj-$(CONFIG_BZIP2) += bzip2/
 obj-$(CONFIG_TIZEN) += tizen/
-obj-$(CONFIG_OF_LIBFDT) += libfdt/
-obj-$(CONFIG_FIT) += libfdt/
 obj-$(CONFIG_FIT) += libfdt/
 obj-$(CONFIG_CMD_DHRYSTONE) += dhry/
 
@@ -50,9 +48,7 @@ obj-$(CONFIG_BITREVERSE) += bitrev.o
 obj-y += list_sort.o
 endif
 
-ifndef CONFIG_SPL_BUILD
-obj-$(CONFIG_OF_LIBFDT) += libfdt/
-endif
+obj-$(CONFIG_$(SPL_)OF_LIBFDT) += libfdt/
 ifdef CONFIG_SPL_OF_CONTROL
 obj-$(CONFIG_OF_LIBFDT) += libfdt/
 endif