Documentation: kbuild: Remove obsolete dtc_cpp section

Commit b40b25fff8205dd18124d8fc87b2c9c57f269b5f ("kbuild: always
run gcc -E on *.dts, remove cmd_dtc_cpp") improved the functionality of
cmd_dtc_cpp and merged it back into cmd_dtc.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>

1 files changed, 0 insertions, 23 deletions

diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 520b2c75bc56..eda00a1073a7 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -1163,29 +1163,6 @@ When kbuild executes, the following steps are followed (roughly):
                 clean-files += *.dtb
                 DTC_FLAGS ?= -p 1024
 
-    dtc_cpp
-        This is just like dtc as describe above, except that the C pre-
-        processor is invoked upon the .dtsp file before compiling the result
-        with dtc.
-
-        In order for build dependencies to work, all files compiled using
-        dtc_cpp must use the C pre-processor's #include functionality and not
-        dtc's /include/ functionality.
-
-        Using the C pre-processor allows use of #define to create named
-        constants. In turn, the #defines will typically appear in a header
-        file, which may be shared with regular C code. Since the dtc language
-        represents a data structure rather than code in C syntax, similar
-        restrictions are placed on a header file included by a device tree
-        file as for a header file included by an assembly language file.
-        In particular, the C pre-processor is passed -x assembler-with-cpp,
-        which sets macro __ASSEMBLY__. __DTS__ is also set. These allow header
-        files to restrict their content to that compatible with device tree
-        source.
-
-        A central rule exists to create $(obj)/%.dtb from $(src)/%.dtsp;
-        architecture Makefiles do no need to explicitly write out that rule.
-
 --- 6.8 Custom kbuild commands
 
         When kbuild is executing with KBUILD_VERBOSE=0, then only a shorthand