of/flattree: Add Kconfig for EARLY_FLATTREE

The device tree code is now in two pieces: some which can be used generically
on any platform which selects CONFIG_OF_FLATTREE, and some early which is used
at boot time on only a few architectures.  This patch segregates the early
code so that only those architectures which care about it need compile it.
This also means that some of the requirements in the early code (such as
a cmd_line variable) that most architectures (e.g. X86) don't provide
can be ignored.

Signed-off-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
[grant.likely@secretlab.ca: remove extra blank line addition]
[grant.likely@secretlab.ca: fixed incorrect #ifdef CONFIG_EARLY_FLATTREE check]
[grant.likely@secretlab.ca: Made OF_EARLY_FLATTREE select instead of depend
                            on OF_FLATTREE]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 387d5ff..5f5018a 100644 (file)
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -14,7 +14,7 @@ config MICROBLAZE
        select HAVE_DMA_API_DEBUG
        select TRACING_SUPPORT
        select OF
-       select OF_FLATTREE
+       select OF_EARLY_FLATTREE
 
 config SWAP
        def_bool n

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 0a9b5b8..f489ec3 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2218,7 +2218,7 @@ config SECCOMP
 config USE_OF
        bool "Flattened Device Tree support"
        select OF
-       select OF_FLATTREE
+       select OF_EARLY_FLATTREE
        help
          Include support for flattened device tree machine descriptions.
 

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e625e9e..48fb479 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -116,7 +116,7 @@ config PPC
        bool
        default y
        select OF
-       select OF_FLATTREE
+       select OF_EARLY_FLATTREE
        select HAVE_FTRACE_MCOUNT_RECORD
        select HAVE_DYNAMIC_FTRACE
        select HAVE_FUNCTION_TRACER

diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index e4b93a0..3c6e100 100644 (file)
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -19,6 +19,10 @@ config OF_FLATTREE
        bool
        select DTC
 
+config OF_EARLY_FLATTREE
+       bool
+       select OF_FLATTREE
+
 config OF_PROMTREE
        bool
 

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index c1360e0..2ebacf1 100644 (file)
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -27,6 +27,8 @@ int __initdata dt_root_size_cells;
 
 struct boot_param_header *initial_boot_params;
 
+#ifdef CONFIG_OF_EARLY_FLATTREE
+
 char *find_flat_dt_string(u32 offset)
 {
        return ((char *)initial_boot_params) +
@@ -604,3 +606,5 @@ void __init unflatten_device_tree(void)
 
        pr_debug(" <- unflatten_device_tree()\n");
 }
+
+#endif /* CONFIG_OF_EARLY_FLATTREE */