linux-kernel - Re: [PATCH] kbuild: take into account DT_SCHEMA

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Date:   Wed, 27 Jul 2022 11:36:06 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH] kbuild: take into account DT_SCHEMA_FILES changes while
 checking dtbs

On Wed, Jul 27, 2022 at 4:06 AM Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> It is useful to be able to recheck dtbs files against a limited set of
> DT schema files. This can be accomplished by using differnt
> DT_SCHEMA_FILES argument values while rerunning make dtbs_check. However
> for some reason if_changed_rule doesn't pick up the rule_dtc changes
> (and doesn't retrigger the build).
>
> Fix this by changing if_changed_rule to if_changed_dep and squashing DTC
> and dt-validate into a single new command. Then if_changed_dep triggers
> on DT_SCHEMA_FILES changes and reruns the build/check.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  scripts/Makefile.lib | 14 ++++++--------
>  1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index c88b98b5dc44..3df470289382 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -383,17 +383,15 @@ DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
>  DT_BINDING_DIR := Documentation/devicetree/bindings
>  DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
>
> -quiet_cmd_dtb_check =  CHECK   $@
> -      cmd_dtb_check =  $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true
> +quiet_cmd_dtb =        DTC/CHECK   $@

This is supposed to be 7 chars or less. DTCCHK or DTC_CHK perhaps. Or
always do just 'DTC'. I can fixup when applying.

I'll give it a few days for other comments.

> +      cmd_dtb =        $(cmd_dtc) ; $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true
> +else
> +quiet_cmd_dtb = $(quiet_cmd_dtc)
> +      cmd_dtb = $(cmd_dtc)
>  endif
>
> -define rule_dtc
> -       $(call cmd_and_fixdep,dtc)
> -       $(call cmd,dtb_check)
> -endef
> -
>  $(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
> -       $(call if_changed_rule,dtc)
> +       $(call if_changed_dep,dtb)
>
>  $(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
>         $(call if_changed_dep,dtc)
> --
> 2.35.1
>