linux-kernel - Re: [PATCH V5 4/5] kbuild: Add support to build overlays (%.dtbo)

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Date:   Thu, 21 Jan 2021 11:49:55 +1100
From:   David Gibson <david@...son.dropbear.id.au>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bill Mills <bill.mills@...aro.org>, anmar.oueja@...aro.org,
        linux-kbuild@...r.kernel.org
Subject: Re: [PATCH V5 4/5] kbuild: Add support to build overlays (%.dtbo)

On Wed, Jan 20, 2021 at 12:36:46PM +0530, Viresh Kumar wrote:
> Add support for building DT overlays (%.dtbo). The overlay's source file
> will have the usual extension, i.e. .dts, though the blob will have
> .dtbo extension to distinguish it from normal blobs.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  .gitignore               | 3 +--
>  Makefile                 | 4 ++--
>  scripts/Makefile.dtbinst | 3 +++
>  scripts/Makefile.lib     | 4 +++-
>  4 files changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/.gitignore b/.gitignore
> index d01cda8e1177..0458c36f3cb2 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -17,8 +17,7 @@
>  *.bz2
>  *.c.[012]*.*
>  *.dt.yaml
> -*.dtb
> -*.dtb.S
> +*.dtb*
>  *.dwo
>  *.elf
>  *.gcno
> diff --git a/Makefile b/Makefile
> index 9e73f82e0d86..b84f5e0b46ab 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1334,7 +1334,7 @@ endif
>  
>  ifneq ($(dtstree),)
>  
> -%.dtb: include/config/kernel.release scripts_dtc
> +%.dtb %.dtbo: include/config/kernel.release scripts_dtc
>  	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
>  
>  PHONY += dtbs dtbs_install dtbs_check
> @@ -1816,7 +1816,7 @@ clean: $(clean-dirs)
>  	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
>  		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
>  		-o -name '*.ko.*' \
> -		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
> +		-o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
>  		-o -name '*.dwo' -o -name '*.lst' \
>  		-o -name '*.su' -o -name '*.mod' \
>  		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
> diff --git a/scripts/Makefile.dtbinst b/scripts/Makefile.dtbinst
> index 50d580d77ae9..ba01f5ba2517 100644
> --- a/scripts/Makefile.dtbinst
> +++ b/scripts/Makefile.dtbinst
> @@ -29,6 +29,9 @@ quiet_cmd_dtb_install = INSTALL $@
>  $(dst)/%.dtb: $(obj)/%.dtb
>  	$(call cmd,dtb_install)
>  
> +$(dst)/%.dtbo: $(obj)/%.dtbo
> +	$(call cmd,dtb_install)
> +
>  PHONY += $(subdirs)
>  $(subdirs):
>  	$(Q)$(MAKE) $(dtbinst)=$@ dst=$(patsubst $(obj)/%,$(dst)/%,$@)
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 213677a5ed33..30bc0a8e0087 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -86,7 +86,9 @@ extra-$(CONFIG_OF_ALL_DTBS)	+= $(dtb-)
>  
>  ifneq ($(CHECK_DTBS),)
>  extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
> +extra-y += $(patsubst %.dtbo,%.dt.yaml, $(dtb-y))
>  extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
> +extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtbo,%.dt.yaml, $(dtb-))
>  endif
>  
>  # Add subdir path
> @@ -324,7 +326,7 @@ cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ;
>  		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
>  	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
>  
> -$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
> +$(obj)/%.dtb $(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
>  	$(call if_changed_dep,dtc)

If you're using overlays, you probably need the -@ flag, for both the
base file and the overlays, which AFAICT is not already the case.

>  
>  DT_CHECKER ?= dt-validate

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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