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SubjectRe: [PATCH V7 1/7] kbuild: centralize .dts->.dtb rule
On 11/27/2012 05:29 PM, Stephen Warren wrote:
> From: Stephen Warren <swarren@nvidia.com>
>
> All architectures that use cmd_dtc do so in almost the same way. Create
> a central build rule to avoid duplication. The one difference is that
> most current uses of dtc build $(obj)/%.dtb from $(src)/dts/%.dts rather
> than building the .dtb in the same directory as the .dts file. This
> difference will be eliminated arch-by-arch in future patches.
>
> MIPS is the exception here; it already uses the exact same rule as the
> new common rule, so the duplicate is removed in this patch to avoid any
> conflict. arch/mips changes courtesy of Ralf Baechle.
>
> Update Documentation/kbuild to remove the explicit call to cmd_dtc from
> the example, now that the rule exists in a centralized location.
>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: Olof Johansson <olof@lixom.net>
> Cc: Russell King <linux@arm.linux.org.uk>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Jonas Bonn <jonas@southpole.se>
> Cc: linux@lists.openrisc.net
> Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
> Cc: linux-c6x-dev@linux-c6x.org
> Cc: Mark Salter <msalter@redhat.com>
> Cc: Michal Simek <monstr@monstr.eu>
> Cc: microblaze-uclinux@itee.uq.edu.au
> Cc: Chris Zankel <chris@zankel.net>
> Cc: linux-xtensa@linux-xtensa.org
> Cc: Max Filippov <jcmvbkbc@gmail.com>
> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
> Signed-off-by: Stephen Warren <swarren@nvidia.com>
> ---
> This is based on next-20121126.
>

I'll apply the series but I need a stable base. Looks like xtensa has
the dependency. Or I can just drop xtensa.

Rob

> I've split out this dtc rule cleanup as a separate patch series.
> Hopefully it can be applied without too much controversy, then I'll move
> back to discussing running cpp over *.dts.
>
> v7:
> * Build *.dtb from *.dts not src/*.dts.
> * Removed all arch/ updates except MIPS.
> v6: Added arch/{arm64,microblaze,mips} updates.
> v5: Updated Documentation/kbuild.
> v4: No change.
> v3: No change.
> v2: New patch.
> ---
> Documentation/kbuild/makefiles.txt | 15 ++++++++-------
> arch/mips/cavium-octeon/Makefile | 3 ---
> arch/mips/lantiq/dts/Makefile | 3 ---
> arch/mips/netlogic/dts/Makefile | 3 ---
> scripts/Makefile.lib | 3 +++
> 5 files changed, 11 insertions(+), 16 deletions(-)
>
> diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
> index ec9ae67..14c3f4f 100644
> --- a/Documentation/kbuild/makefiles.txt
> +++ b/Documentation/kbuild/makefiles.txt
> @@ -1175,15 +1175,16 @@ When kbuild executes, the following steps are followed (roughly):
> in an init section in the image. Platform code *must* copy the
> blob to non-init memory prior to calling unflatten_device_tree().
>
> - Example:
> - #arch/x86/platform/ce4100/Makefile
> - clean-files := *dtb.S
> + To use this command, simply add *.dtb into obj-y or targets, or make
> + some other target depend on %.dtb
>
> - DTC_FLAGS := -p 1024
> - obj-y += foo.dtb.o
> + A central rule exists to create $(obj)/%.dtb from $(src)/%.dts;
> + architecture Makefiles do no need to explicitly write out that rule.
>
> - $(obj)/%.dtb: $(src)/%.dts
> - $(call cmd,dtc)
> + Example:
> + targets += $(dtb-y)
> + clean-files += *.dtb
> + DTC_FLAGS ?= -p 1024
>
> --- 6.8 Custom kbuild commands
>
> diff --git a/arch/mips/cavium-octeon/Makefile b/arch/mips/cavium-octeon/Makefile
> index bc96e29..6e927cf 100644
> --- a/arch/mips/cavium-octeon/Makefile
> +++ b/arch/mips/cavium-octeon/Makefile
> @@ -24,9 +24,6 @@ DTB_FILES = $(patsubst %.dts, %.dtb, $(DTS_FILES))
>
> obj-y += $(patsubst %.dts, %.dtb.o, $(DTS_FILES))
>
> -$(obj)/%.dtb: $(src)/%.dts FORCE
> - $(call if_changed_dep,dtc)
> -
> # Let's keep the .dtb files around in case we want to look at them.
> .SECONDARY: $(addprefix $(obj)/, $(DTB_FILES))
>
> diff --git a/arch/mips/lantiq/dts/Makefile b/arch/mips/lantiq/dts/Makefile
> index 674fca4..6fa72dd 100644
> --- a/arch/mips/lantiq/dts/Makefile
> +++ b/arch/mips/lantiq/dts/Makefile
> @@ -1,4 +1 @@
> obj-$(CONFIG_DT_EASY50712) := easy50712.dtb.o
> -
> -$(obj)/%.dtb: $(obj)/%.dts
> - $(call if_changed,dtc)
> diff --git a/arch/mips/netlogic/dts/Makefile b/arch/mips/netlogic/dts/Makefile
> index 67ae3fe2..d117d46 100644
> --- a/arch/mips/netlogic/dts/Makefile
> +++ b/arch/mips/netlogic/dts/Makefile
> @@ -1,4 +1 @@
> obj-$(CONFIG_DT_XLP_EVP) := xlp_evp.dtb.o
> -
> -$(obj)/%.dtb: $(obj)/%.dts
> - $(call if_changed,dtc)
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 0be6f11..bdf42fd 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -266,6 +266,9 @@ $(obj)/%.dtb.S: $(obj)/%.dtb
> quiet_cmd_dtc = DTC $@
> cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) -d $(depfile) $<
>
> +$(obj)/%.dtb: $(src)/%.dts FORCE
> + $(call if_changed_dep,dtc)
> +
> # Bzip2
> # ---------------------------------------------------------------------------
>
>


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