linux-kernel - Re: [PATCH V7 1/7] kbuild: centralize .dts->.dtb rule

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Message-ID: <50B8D86E.1080109@gmail.com>
Date:	Fri, 30 Nov 2012 10:01:50 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	Michal Marek <mmarek@...e.cz>,
	Grant Likely <grant.likely@...retlab.ca>,
	Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Stephen Warren <swarren@...dia.com>,
	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	Olof Johansson <olof@...om.net>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Jonas Bonn <jonas@...thpole.se>, linux@...ts.openrisc.net,
	Aurelien Jacquiot <a-jacquiot@...com>,
	linux-c6x-dev@...ux-c6x.org, Mark Salter <msalter@...hat.com>,
	Michal Simek <monstr@...str.eu>,
	microblaze-uclinux@...e.uq.edu.au, Chris Zankel <chris@...kel.net>,
	linux-xtensa@...ux-xtensa.org, Max Filippov <jcmvbkbc@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH V7 1/7] kbuild: centralize .dts->.dtb rule

On 11/27/2012 05:29 PM, Stephen Warren wrote:
> From: Stephen Warren <swarren@...dia.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@...db.de>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: Olof Johansson <olof@...om.net>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Jonas Bonn <jonas@...thpole.se>
> Cc: linux@...ts.openrisc.net
> Cc: Aurelien Jacquiot <a-jacquiot@...com>
> Cc: linux-c6x-dev@...ux-c6x.org
> Cc: Mark Salter <msalter@...hat.com>
> Cc: Michal Simek <monstr@...str.eu>
> Cc: microblaze-uclinux@...e.uq.edu.au
> Cc: Chris Zankel <chris@...kel.net>
> Cc: linux-xtensa@...ux-xtensa.org
> Cc: Max Filippov <jcmvbkbc@...il.com>
> Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
> Signed-off-by: Stephen Warren <swarren@...dia.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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