kbuild: add -Wall to KBUILD_HOSTCXXFLAGS ...

[ Linux commit 735aab1 ]

Add -Wall to catch more warnings for C++ host programs.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: add -Werror={strict-prototypes, implicit-int} to KBUILD_CFLAGS ...

- Turn Wstrict-prototypes into an error
- Add -Werror=implicit-int
- Use the standard form -Werror=... for implicit-function-declaration

This commit imports the following Linux commits. They should work for
barebox too.

80970472179a Makefile: enable -Werror=implicit-int and -Werror=strict-prototypes by default
eeb5687a7139 kbuild: add -Werror=strict-prototypes flag unconditionally
61a0902a06d6 kbuild: add -Werror=implicit-int flag unconditionally
b89f25ea7892 kbuild: use -Werror=implicit-... instead of -Werror-implicit-...

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: sync scripts/Kbuild.include with Linux 5.7-rc2 ...

More random cherry-picks for scripts/Kbuild.include

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: sync if_changed and friends with Linux 5.7-rc2 ...

Resync cmd, if_change, if_changed_dep, and if_changed_rule.

Clean up the users of if_changed_rule.

I deleted the modversions rule. It is dead code because barebox
does not define CONFIG_MODVERSIONS. It does not work without
scripts/genksyms/ anyway.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: sync filechk rule with Linux 5.7-rc2 ...

The 'filechk' in the latest Linux works more simply, reliably.

- Do not show CHK every time
- Delete the *.tmp file when the filechk_$(1) fails
- Do not open the first prerequisite. This is unneeded in most cases.

I deleted pointeless dependency on Makefile.

Also delete the meaningless assignment to 'targets' because filechk
does not generate .cmd file.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: do not delete $@ explicitly on failure ...

The .DELETE_ON_ERROR special target is specified in scripts/Kbuild.include

You do not need to delete $@ explicitly when the command fails.
GNU Make automatically does it.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mips: remove unused board/debug_ll.h ...

There is no way to include <board/debug_ll.h>. These three files
are dead code.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mips: remove unused INCDIR and BOARD variables in Makefile ...

The variable INCDIR is not used by anyone.

The variable BOARD is not set by anyone, so $(BOARD) is always empty.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ppc: rename arch/ppc/ to arch/powerpc/ ...

In old days, Linux supported PowerPC with two arch directories,
arch/ppc/ and arch/ppc64/.

Linux commit 564ee7a5668e ("[PATCH] powerpc: Move arch/ppc*/kernel/vecemu.c
to arch/powerpc") started the migration to arch/powerpc/, and
commit 917f0af9e5a9 ("powerpc: Remove arch/ppc and include/asm-ppc")
finished it.

This commit aligns the directory name with the current Linux.

I did 'git mv arch/ppc/ arch/powerpc/', and fixed up some hard-coded
arch/ppc paths.

Barebox has stuck to arch/ppc/ for a long time. To keep the backward
compatibility, I added the following to the top Makefile.

  # Support ARCH=ppc for backward compatibility
  ifeq ($(ARCH),ppc)
         SRCARCH := powerpc
  endif

Both ARCH=ppc and ARCH=powerpc work in the same way.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

image: support 'powerpc' for mkimage architecture ...

Currently, the -A option of mkimage is determined based on $(SRCARCH).

I want to rename arch/ppc/ to arch/powerpc/.

Support 'powerpc' for the -A option of mkimage beforehand, otherwise
the barebox.uimage build would be broken.

common/image.c in U-Boot supports both 'powerpc' and 'ppc' for the
name of IH_ARCH_PPC. Let's do likewise in barebox.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ppc: add arch/ppc/Kbuild ...

Add arch/ppc/Kbuild to clean up arch/ppc/Makefile.

The variable, CPU is used only for determining if Kbuild should
descend to cpu-85xx/.

  obj-$(CONFIG_ARCH_MPC85XX) += cpu-85xx/

is preferred.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ppc: remove unneeded -D CONFIG_PPC ...

CONFIG_PPC is defined by arch/ppc/Kconfig.

There is no need to define it explicitly.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: set SRCARCH=arm when ARCH=arm64 ...

In Linux, ARCH can be passed from the command line or the environment.
In barebox, "ARCH=arm64 make" works, but "make ARCH=arm64" does not.

Instead of overriding ARCH, use SRCARCH properly.

This is what Linux does for biarch directories (x86, sh, sparc).

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: use $(SRCARCH) to point to the arch directory ...

A couple of arch directories in Linux are biarch, that is, a single
arch/*/ directory supports both 32-bit and 64-bit.

In old days of Linux, they started as separated directories.
arm/arm64 is the exceptional case, but the other architectures were
unified.

e.g.)

  arch/i386, arch/x86_64    ->  arch/x86
  arch/sh, arch/sh64        ->  arch/sh
  arch/sparc, arch/sparc64  ->  arch/sparc

Linux commit 6752ed90da03 ("Kbuild: allow arch/xxx to use a different
source path") introduced SRCARCH to point to the arch directory, still
allowing to pass in the former ARCH=i386 or ARCH=x86_64.

The top Makefile in Linux converts ARCH to SRCARCH as follows:

  # Additional ARCH settings for x86
  ifeq ($(ARCH),i386)
          SRCARCH := x86
  endif
  ifeq ($(ARCH),x86_64)
          SRCARCH := x86
  endif

So, if you follow the upstream Kbuild convention, using arch/$(SRCARCH)
is the correct way to point to the arch directory.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: make DEFCONFIG_LIST work ...

Most of the Kconfig commands (except defconfig and all*config) read
the .config file as a base set of CONFIG options.

When it does not exist, the files in DEFCONFIG_LIST are searched in
this order and loaded if found.

This is not working for barebox because ARCH_DEFCONFIG is not set by
anyone, nor arch/$(ARCH)/defconfig exists.

Fix this.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: swap the include order of arch Makefile and auto.conf.cmd ...

Include

  include/config/auto.conf
  arch/$(ARCH)/Makefile
  include/config/auto.conf.cmd

in this order, which is the same as the current Linux does.

auto.conf.cmd contains the environment variables that were referenced
from Kconfig files. If an environment variable defined in arch Makefile
is referenced from Kconfig files, Kbuild would end up with eternal
synconfig loop.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

modpost: sync mk_elfconfig.c with Linux 5.7-rc2 ...

Just get rid of the argument $(ARCH), then hardcode MODULE_SYMBOL_PREFIX.
This should have no impact because none of v850, h8300, blackfin is
supported by barebox.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: remove meaningless headers_check from help target ...

This is never shown because include/asm-$(ARCH)/Kbuild does not exist.

headers_check does not make any sense for barebox.

Linux also deprecated headers_check by commit 7ecaf069da52 ("kbuild:
move headers_check rule to usr/include/Makefile").

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kconfig: update to Linux 5.7-rc2 ...

The previous sync was Linux 5.5. This updates Kconfig to Linux 5.7-rc2.

Highlights:

 - add yes2modconfig and mod2yesconfig, which are useful for coping with
   syzbot configs in Linux

 - remove include/config/tristate.conf

 - show more precise help

 - fix various issues of 'make xconfig'

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: prefix compiler flag variables with KBUILD_ ...

In old days, Linux also used to use well-known variables such CFLAGS,
CPPFLAGS, etc.

They were prefixed with KBUILD_ presumably for preventing users from
overriding them accidentally.

Rename as follows:
  CFLAGS          ->  KBUILD_CFLAGS
  AFLAGS          ->  KBUILD_AFLAGS
  CPPFLAGS        ->  KBUILD_CPPFLAGS
  LDFLAGS         ->  KBUILD_LDFLAGS
  HOSTCFLAGS      ->  KBUILD_HOSTCFLAGS
  HOSTCXXFLAGS    ->  KBUILD_HOSTCXXFLAGS
  HOSTLDFLAGS     ->  KBUILD_HOSTLDFLAGS
  HOST_LOADLIBES  ->  KBUILD_HOSTLDLIBS

HOSTCFLAGS, HOSTCXXFLAGS, HOSTLDFLAGS, HOSTLDLIBS are re-used to allow
users to pass-in additional flags to the host compiler.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: support ccflags-y, asflags-y, cppflags-y, and ldflags-y ...

Some Makefiles use ccflags-y, but it is not actually supported.
Support ccflags-y, asflags-y, cppflags-y, and ldflags-y like Linux.

Remove the workaround in drivers/pci/Makefile.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mips: rename ldflags-y to mips-ldflags-y ...

The next commit will add ldflags-y to scripts/Makefile.lib like Linux,
but barebox includes scripts/Makefile.lib from the top Makefile.

arch/mips/Makefile uses ldflags-y for a different meaning.

To avoid unpleasant side-effect, this commit rename it.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

riscv: remove meaningless LDFLAGS addition ...

No one sets ldflags-y. This line is meaningless.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ppc: Test for compiler options ...

The -mno-spe and -mspe=no options are not available on all compilers.
Call cc-option to set them only when they exist.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

dtc: remove redundant YYLOC global declaration ...

Same as the upstream fix for building dtc with gcc 10.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Documentation: kvx: add first documentation ...

Add documentation on kvx architecture and kalray k200 board.

Signed-off-by: Clement Leger <cleger@kalray.eu>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: dts. i.MX7: add stopgap solution for barebox UART clock breakage ...

Commit 8b2104d740 ("driver: Call of_clk_set_defaults for each probed device")
made barebox act on the assigned-clock-parents property everywhere, not
only for clock provider nodes. This breaks at least the serial console on
the i.MX7 SabreSD board; only garbage is output if the patch is not
reverted. As stopgap measure, override these properties for all enabled
uart nodes in the barebox i.MX7 device tree. This reverts the behavior
to what it was like before the offending commit.

This is of course no real solution, as obviously Linux was fine dealing
with these properties before. But this hack should at least fix the
serial console for the boards that were broken in v2020.03.0.

When a proper fix follows, this patch can be reverted.

Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Juergen Borleis <jbe@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/zynq'

Merge branch 'for-next/zii'

Merge branch 'for-next/usb'