linux-kernel - Re: [PATCH V7 2/7] ARM: dt: change .dtb build rules to build in dts directory

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Date:	Wed, 26 Dec 2012 22:27:42 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	Michal Marek <mmarek@...e.cz>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Sam Ravnborg <sam@...nborg.org>,
	<linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	<linux-arm-kernel@...ts.infradead.org>,
	Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH V7 2/7] ARM: dt: change .dtb build rules to build in dts
 directory

On Tue, Nov 27, 2012 at 04:29:11PM -0700, Stephen Warren wrote:
> From: Grant Likely <grant.likely@...retlab.ca>
> 
> The current rules have the .dtb files build in a different directory
> from the .dts files. The only reason for this is that it was what
> PowerPC has done historically. This patch changes ARM to use the generic
> dtb rule which builds .dtb files in the same directory as the source .dts.
> 
It's a pity that after merging the patch, all the enabled dts files
will be rebuilt anyway no matter whether they are actually changed
or not.

Shawn

> Cc: Russell King <linux@....linux.org.uk>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Olof Johansson <olof@...om.net>
> Cc: linux-arm-kernel@...ts.infradead.org
> Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
> [swarren: added rm command for old stale .dtb files]
> Signed-off-by: Stephen Warren <swarren@...dia.com>
> ---
> v7: New patch.
> ---
>  arch/arm/Makefile          |    4 ++--
>  arch/arm/boot/Makefile     |   12 ------------
>  arch/arm/boot/dts/Makefile |    8 ++++++++
>  3 files changed, 10 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index 1ec5f67..5f92252 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -291,10 +291,10 @@ zinstall uinstall install: vmlinux
>  	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@
>  
>  %.dtb: scripts
> -	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
> +	$(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) $(boot)/dts/$@
>  
>  dtbs: scripts
> -	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
> +	$(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) dtbs
>  
>  # We use MRPROPER_FILES and CLEAN_FILES now
>  archclean:
> diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile
> index 9137df5..abfce28 100644
> --- a/arch/arm/boot/Makefile
> +++ b/arch/arm/boot/Makefile
> @@ -15,8 +15,6 @@ ifneq ($(MACHINE),)
>  include $(srctree)/$(MACHINE)/Makefile.boot
>  endif
>  
> -include $(srctree)/arch/arm/boot/dts/Makefile
> -
>  # Note: the following conditions must always be true:
>  #   ZRELADDR == virt_to_phys(PAGE_OFFSET + TEXT_OFFSET)
>  #   PARAMS_PHYS must be within 4MB of ZRELADDR
> @@ -59,16 +57,6 @@ $(obj)/zImage:	$(obj)/compressed/vmlinux FORCE
>  
>  endif
>  
> -targets += $(dtb-y)
> -
> -# Rule to build device tree blobs
> -$(obj)/%.dtb: $(src)/dts/%.dts FORCE
> -	$(call if_changed_dep,dtc)
> -
> -$(obj)/dtbs: $(addprefix $(obj)/, $(dtb-y))
> -
> -clean-files := *.dtb
> -
>  ifneq ($(LOADADDR),)
>    UIMAGE_LOADADDR=$(LOADADDR)
>  else
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index a17d5ab..cb217f8 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -136,4 +136,12 @@ dtb-$(CONFIG_ARCH_VT8500) += vt8500-bv07.dtb \
>  	wm8650-mid.dtb
>  dtb-$(CONFIG_ARCH_ZYNQ) += zynq-zc702.dtb
>  
> +targets += dtbs
>  endif
> +
> +dtbs: $(addprefix $(obj)/, $(dtb-y))
> +	# *.dtb used to be generated in the directory above. Clean out the
> +	# old build results so people don't accidentally use them.
> +	rm -f $(obj)/../*.dtb
> +
> +clean-files := *.dtb
> -- 
> 1.7.10.4
> 
> --
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