linux-kernel - Re: [PATCH 1/2] dt-bindings: kbuild: Pass DT_SCHEMA

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Date:   Fri, 4 Mar 2022 13:48:37 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Maxime Ripard <maxime@...no.tech>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: kbuild: Pass DT_SCHEMA_FILES to
 dt-validate

On Thu, Mar 03, 2022 at 04:42:36PM -0600, Rob Herring wrote:
> In preparation for supporting validation of DTB files, the full
> processed schema will always be needed in order to extract type
> information from it. Therefore, the processed schema containing only
> what DT_SCHEMA_FILES specifies won't work. Instead, dt-validate has
> gained an option, -l or --limit, to specify which schema(s) to use for
> validation.
> 
> As the command line option is new, we the minimum dtschema version must be
> updated.
> 
> Cc: Masahiro Yamada <masahiroy@...nel.org>
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
>  Documentation/devicetree/bindings/Makefile | 28 +++-------------------
>  scripts/Makefile.lib                       |  3 +--
>  2 files changed, 4 insertions(+), 27 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/Makefile b/Documentation/devicetree/bindings/Makefile
> index 61ec18ecc931..246ba0ecab64 100644
> --- a/Documentation/devicetree/bindings/Makefile
> +++ b/Documentation/devicetree/bindings/Makefile
> @@ -6,7 +6,7 @@ DT_MK_SCHEMA ?= dt-mk-schema
>  DT_SCHEMA_LINT := $(shell which yamllint || \
>    echo "warning: yamllint not installed, skipping. To install, run 'pip install yamllint'" >&2)
>  
> -DT_SCHEMA_MIN_VERSION = 2021.2.1
> +DT_SCHEMA_MIN_VERSION = 2022.3
>  
>  PHONY += check_dtschema_version
>  check_dtschema_version:
> @@ -25,9 +25,6 @@ quiet_cmd_extract_ex = DTEX    $@
>  $(obj)/%.example.dts: $(src)/%.yaml check_dtschema_version FORCE
>  	$(call if_changed,extract_ex)
>  
> -# Use full schemas when checking %.example.dts
> -DT_TMP_SCHEMA := $(obj)/processed-schema-examples.json
> -
>  find_all_cmd = find $(srctree)/$(src) \( -name '*.yaml' ! \
>  		-name 'processed-schema*' ! \
>  		-name '*.example.dt.yaml' \)
> @@ -70,29 +67,10 @@ override DTC_FLAGS := \
>  # Disable undocumented compatible checks until warning free
>  override DT_CHECKER_FLAGS ?=
>  
> -$(obj)/processed-schema-examples.json: $(DT_DOCS) $(src)/.yamllint check_dtschema_version FORCE
> +$(obj)/processed-schema.json: $(DT_DOCS) $(src)/.yamllint check_dtschema_version FORCE
>  	$(call if_changed_rule,chkdt)
>  
> -ifeq ($(DT_SCHEMA_FILES),)
> -
> -# Unless DT_SCHEMA_FILES is specified, use the full schema for dtbs_check too.
> -# Just copy processed-schema-examples.json
> -
> -$(obj)/processed-schema.json: $(obj)/processed-schema-examples.json FORCE
> -	$(call if_changed,copy)
> -
> -else
> -
> -# If DT_SCHEMA_FILES is specified, use it for processed-schema.json
> -
> -$(obj)/processed-schema.json: DT_MK_SCHEMA_FLAGS := -u
> -$(obj)/processed-schema.json: $(CHK_DT_DOCS) check_dtschema_version FORCE
> -	$(call if_changed,mk_schema)
> -
> -endif
> -
> -always-$(CHECK_DT_BINDING) += processed-schema-examples.json
> -always-$(CHECK_DTBS)       += processed-schema.json
> +always-y += processed-schema.json
>  always-$(CHECK_DT_BINDING) += $(patsubst $(srctree)/$(src)/%.yaml,%.example.dts, $(CHK_DT_DOCS))
>  always-$(CHECK_DT_BINDING) += $(patsubst $(srctree)/$(src)/%.yaml,%.example.dt.yaml, $(CHK_DT_DOCS))
>  
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 79be57fdd32a..9f1e8442564e 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -361,9 +361,8 @@ $(multi-dtb-y): FORCE
>  $(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)
>  
>  DT_CHECKER ?= dt-validate
> -DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),,-m)
> +DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
>  DT_BINDING_DIR := Documentation/devicetree/bindings
> -# DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile
>  DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.json

This could now use := instead of ?=

Apart from the fact that 2022.3 hasn't been tagged yet as pointed out by
Geert, this looks fine to me (but I'm no expert in this area).

>  
>  quiet_cmd_dtb_check =	CHECK   $@

-- 
Regards,

Laurent Pinchart