[U-Boot] [PATCH v2] libfdt: replace ARCH_FIXUP_FDT with ARCH_FIXUP_FDT_MEMORY

[Masahiro Yamada <yamada.masahiro@socionext.com>]

Commit e2f88dfd2d96 ("libfdt: Introduce new ARCH_FIXUP_FDT option")
allows us to skip memory setup of DTB, but a problem for ARM is that
spin_table_update_dt() and psci_update_dt() are skipped as well if
CONFIG_ARCH_FIXUP_FDT is disabled.

This commit allows us to skip only fdt_fixup_memory_banks() instead
of the whole of arch_fixup_fdt().  It will be useful when we want to
use a memory node from a kernel DTB as is, but need some fixups for
Spin-Table/PSCI.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v2:
 - Add empty stub to ARC, PowerPC, Microblaze instead of
   a weak function common/image-fdt.c

 Kconfig                     | 5 ++---
 arch/arc/lib/bootm.c        | 5 +++++
 arch/arm/lib/bootm-fdt.c    | 2 --
 arch/arm/lib/bootm.c        | 2 --
 arch/microblaze/lib/bootm.c | 5 +++++
 arch/mips/lib/bootm.c       | 2 --
 arch/powerpc/lib/bootm.c    | 5 +++++
 common/fdt_support.c        | 2 ++
 common/image-fdt.c          | 2 --
 include/fdt_support.h       | 8 ++++++++
 10 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/Kconfig b/Kconfig
index 1263d0b..b7cb142 100644
--- a/Kconfig
+++ b/Kconfig
@@ -324,9 +324,8 @@ config SYS_CLK_FREQ
 	help
 	  TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 
-config ARCH_FIXUP_FDT
-	bool "Enable arch_fixup_fdt() call"
-	depends on ARM || MIPS
+config ARCH_FIXUP_FDT_MEMORY
+	bool "Enable arch_fixup_memory_banks() call"
 	default y
 	help
 	  Enable FDT memory map syncup before OS boot. This feature can be
diff --git a/arch/arc/lib/bootm.c b/arch/arc/lib/bootm.c
index 04d9d9c..5798149 100644
--- a/arch/arc/lib/bootm.c
+++ b/arch/arc/lib/bootm.c
@@ -37,6 +37,11 @@ void arch_lmb_reserve(struct lmb *lmb)
 	lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
 }
 
+int arch_fixup_fdt(void *blob)
+{
+	return 0;
+}
+
 static int cleanup_before_linux(void)
 {
 	disable_interrupts();
diff --git a/arch/arm/lib/bootm-fdt.c b/arch/arm/lib/bootm-fdt.c
index a517550..4481f9e 100644
--- a/arch/arm/lib/bootm-fdt.c
+++ b/arch/arm/lib/bootm-fdt.c
@@ -25,7 +25,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#ifdef CONFIG_ARCH_FIXUP_FDT
 int arch_fixup_fdt(void *blob)
 {
 	bd_t *bd = gd->bd;
@@ -61,4 +60,3 @@ int arch_fixup_fdt(void *blob)
 
 	return 0;
 }
-#endif
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index 53c3141..0e890ce 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -372,10 +372,8 @@ void boot_prep_vxworks(bootm_headers_t *images)
 	if (images->ft_addr) {
 		off = fdt_path_offset(images->ft_addr, "/memory");
 		if (off < 0) {
-#ifdef CONFIG_ARCH_FIXUP_FDT
 			if (arch_fixup_fdt(images->ft_addr))
 				puts("## WARNING: fixup memory failed!\n");
-#endif
 		}
 	}
 #endif
diff --git a/arch/microblaze/lib/bootm.c b/arch/microblaze/lib/bootm.c
index 3eb3440..2732203 100644
--- a/arch/microblaze/lib/bootm.c
+++ b/arch/microblaze/lib/bootm.c
@@ -17,6 +17,11 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+int arch_fixup_fdt(void *blob)
+{
+	return 0;
+}
+
 int do_bootm_linux(int flag, int argc, char * const argv[],
 		   bootm_headers_t *images)
 {
diff --git a/arch/mips/lib/bootm.c b/arch/mips/lib/bootm.c
index 0c6a4ab..aa0475a 100644
--- a/arch/mips/lib/bootm.c
+++ b/arch/mips/lib/bootm.c
@@ -253,7 +253,6 @@ static int boot_reloc_fdt(bootm_headers_t *images)
 #endif
 }
 
-#ifdef CONFIG_ARCH_FIXUP_FDT
 int arch_fixup_fdt(void *blob)
 {
 #if CONFIG_IS_ENABLED(MIPS_BOOT_FDT) && CONFIG_IS_ENABLED(OF_LIBFDT)
@@ -265,7 +264,6 @@ int arch_fixup_fdt(void *blob)
 	return 0;
 #endif
 }
-#endif
 
 static int boot_setup_fdt(bootm_headers_t *images)
 {
diff --git a/arch/powerpc/lib/bootm.c b/arch/powerpc/lib/bootm.c
index ef15e7a..17c5ed1 100644
--- a/arch/powerpc/lib/bootm.c
+++ b/arch/powerpc/lib/bootm.c
@@ -38,6 +38,11 @@ static void set_clocks_in_mhz (bd_t *kbd);
 #define CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE	(768*1024*1024)
 #endif
 
+int arch_fixup_fdt(void *blob)
+{
+	return 0;
+}
+
 static void boot_jump_linux(bootm_headers_t *images)
 {
 	void	(*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
diff --git a/common/fdt_support.c b/common/fdt_support.c
index 0609470..c9f7019 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -381,6 +381,7 @@ void do_fixup_by_compat_u32(void *fdt, const char *compat,
 	do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
 }
 
+#ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
 /*
  * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
  */
@@ -459,6 +460,7 @@ int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
 	}
 	return 0;
 }
+#endif
 
 int fdt_fixup_memory(void *blob, u64 start, u64 size)
 {
diff --git a/common/image-fdt.c b/common/image-fdt.c
index 5454227..e7540be 100644
--- a/common/image-fdt.c
+++ b/common/image-fdt.c
@@ -474,12 +474,10 @@ int image_setup_libfdt(bootm_headers_t *images, void *blob,
 		printf("ERROR: /chosen node create failed\n");
 		goto err;
 	}
-#ifdef CONFIG_ARCH_FIXUP_FDT
 	if (arch_fixup_fdt(blob) < 0) {
 		printf("ERROR: arch-specific fdt fixup failed\n");
 		goto err;
 	}
-#endif
 	if (IMAGE_OF_BOARD_SETUP) {
 		fdt_ret = ft_board_setup(blob, gd->bd);
 		if (fdt_ret) {
diff --git a/include/fdt_support.h b/include/fdt_support.h
index 506bc5a..955c121 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -93,7 +93,15 @@ int fdt_fixup_memory(void *blob, u64 start, u64 size);
  *			property will be left untouched.
  * @return 0 if ok, or -1 or -FDT_ERR_... on error
  */
+#ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks);
+#else
+static inline int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[],
+					 int banks)
+{
+	return 0;
+}
+#endif
 
 void fdt_fixup_ethernet(void *fdt);
 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
-- 
1.9.1