linux-kernel - Re: [PATCH] kbuild: determine the output format of DTC by the target suffix

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Date:   Fri, 1 May 2020 14:37:07 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: determine the output format of DTC by the target suffix

On Mon, Apr 27, 2020 at 11:13 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> cmd_dtc takes the additional parameter $(2) to select the target
> format, dtb or yaml. This makes things complicated when it is used
> with cmd_and_fixdep and if_changed_rule. I actually stumbled on this.
> See commit 3d4b2238684a ("kbuild: fix DT binding schema rule again to
> avoid needless rebuilds").
>
> Extract the suffix part of the target instead of passing the parameter.
> Fortunately, this works for both $(obj)/%.dtb and $(obj)/%.dt.yaml .
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>



Applied to linux-kbuild.


> ---
>
>  scripts/Makefile.lib | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 12f6a331a8f3..cd52a8c6428f 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -287,13 +287,13 @@ $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
>  quiet_cmd_dtc = DTC     $@
>  cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
>         $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
> -       $(DTC) -O $(2) -o $@ -b 0 \
> +       $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
>                 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
>                 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
>         cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
>
>  $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
> -       $(call if_changed_dep,dtc,dtb)
> +       $(call if_changed_dep,dtc)
>
>  DT_CHECKER ?= dt-validate
>  DT_BINDING_DIR := Documentation/devicetree/bindings
> @@ -304,7 +304,7 @@ quiet_cmd_dtb_check =       CHECK   $@
>        cmd_dtb_check =  $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@
>
>  define rule_dtc
> -       $(call cmd_and_fixdep,dtc,yaml)
> +       $(call cmd_and_fixdep,dtc)
>         $(call cmd,dtb_check)
>  endef
>
> --
> 2.25.1
>


-- 
Best Regards
Masahiro Yamada