linux-kernel - Re: [PATCH v3 32/71] ARC: [DeviceTree] Basic support

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Date:	Mon, 28 Jan 2013 10:21:50 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
CC:	<linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<arnd@...db.de>, Grant Likely <grant.likely@...retlab.ca>,
	<devicetree-discuss@...ts.ozlabs.org>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v3 32/71] ARC: [DeviceTree] Basic support

Hi Vineet,

On 24/01/13 10:50, Vineet Gupta wrote:
> diff --git a/arch/arc/Makefile b/arch/arc/Makefile
> index 4d52a3b..90570f9 100644
> --- a/arch/arc/Makefile
> +++ b/arch/arc/Makefile
> @@ -83,6 +83,9 @@ head-y		:= arch/arc/kernel/head.o
>  # See arch/arc/Kbuild for content of core part of the kernel
>  core-y		+= arch/arc/
>  
> +# w/o this dtb won't embed into kernel binary
> +core-y		+= arch/arc/boot/dts/
> +
>  # w/o this ifneq, make ARCH=arc clean was crapping out
>  ifneq ($(platform-y),)
>  core-y		+= arch/arc/plat-$(PLATFORM)/
> @@ -101,6 +104,12 @@ bootpImage: vmlinux
>  uImage: vmlinux
>  	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
>  
> +%.dtb %.dtb.S %.dtb.o:
> +	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@

arm64 also depends on scripts here, presumably for a reason. I've copied
this in metag too.

> +
> +dtbs:
> +	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@

arm64 does this like below which I think is slightly nicer than how
metag did it:

dtbs: scripts
	$(Q)$(MAKE) $(build)=$(boot)/dts dtbs

> +
>  archclean:
>  	$(Q)$(MAKE) $(clean)=$(boot)
>  
> diff --git a/arch/arc/boot/dts/Makefile b/arch/arc/boot/dts/Makefile
> new file mode 100644
> index 0000000..4a972a3
> --- /dev/null
> +++ b/arch/arc/boot/dts/Makefile
> @@ -0,0 +1,14 @@
> +ifeq ($(CONFIG_OF),y)
> +
> +# Built-in dtb
> +builtindtb-y		:= skeleton
> +
> +ifneq ($(CONFIG_ARC_BUILTIN_DTB_NAME),"")
> +	builtindtb-y	:= $(CONFIG_ARC_BUILTIN_DTB_NAME)
> +endif
> +
> +obj-y	+= $(patsubst "%",%,$(builtindtb-y)).dtb.o
> +
> +clean-files := *.dtb

You don't seem to have a rule for dtbs, but still redirect it in the
main Makefile. I suppose dtbs may want adding to your archhelp if you
use it.

arm64 also adds dtbs and $(dtb-y) to targets (at least in linux-next). I
think this makes sure that they don't get rebuilt unless they've
actually changed. I've also copied this for metag.


> --- a/arch/arc/kernel/Makefile
> +++ b/arch/arc/kernel/Makefile
> @@ -8,6 +8,8 @@
>  obj-y	:= arcksyms.o setup.o irq.o time.o reset.o ptrace.o entry.o process.o
>  obj-y	+= signal.o traps.o sys.o troubleshoot.o stacktrace.o clk.o
>  
> +obj-$(CONFIG_OF)			+= devtree.o
> +

You always select CONFIG_OF, so this could be obj-y. I'm not sure this
particularly matters though.

Cheers
James

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