linux-kernel - Re: [PATCH V11 3/5] kbuild: Allow .dtso format for overlay source files

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Date:   Fri, 12 Mar 2021 01:03:07 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Michal Simek <michal.simek@...inx.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Anmar Oueja <anmar.oueja@...aro.org>,
        Bill Mills <bill.mills@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V11 3/5] kbuild: Allow .dtso format for overlay source
 files

Hi Viresh,

On 3/11/21 10:47 PM, Viresh Kumar wrote:
> On 10-03-21, 20:24, Masahiro Yamada wrote:
>> Even without "-I dts",
>>
>>    inform = guess_input_format(arg, "dts");
>>
>> seems to fall back to "dts" anyway,
>> but I guess you wanted to make this explicit, correct?
> 
> 
>>> +# Required for of unit-test files as they can't be renamed to .dtso
>>
>> If you go with *.dtso, I think you will rename
>> all *.dts under the drivers/ directory.
>>
>> What is blocking you from making this consistent?
> 
> What about this patch instead ? This localizes the dts->dtbo hack to
> unitest's Makefile at least.

It is late here, so I am not going to take the time to actually try what
I am going to suggest.  I apologize in advance if I send you off on a
wild goose chase.

Would it work to create a .dtso file for each of the unittest overlay .dts
files, where the .dtso would simply #include the .dts file.  Then the corresponding
.dtbo files could be added to the obj-$(CONFIG_OF_OVERLAY) list.

I would like to avoid having the unitest-data/Makefile have different rules to
build objects because then the normal build rule is not being tested.

-Frank

> 
> diff --git a/drivers/of/unittest-data/Makefile b/drivers/of/unittest-data/Makefile
> index a5d2d9254b2c..9f3426ec3fab 100644
> --- a/drivers/of/unittest-data/Makefile
> +++ b/drivers/of/unittest-data/Makefile
> @@ -86,3 +86,7 @@ static_test_1-dtbs := static_base_1.dtb $(apply_static_overlay_1)
>  static_test_2-dtbs := static_base_2.dtb $(apply_static_overlay_2)
>  
>  dtb-$(CONFIG_OF_OVERLAY) += static_test_1.dtb static_test_2.dtb
> +
> +# Required for of unittest files as they can't be renamed to .dtso
> +$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
> +       $(call if_changed_dep,dtc)
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index bc045a54a34e..77a9be055e51 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -347,7 +347,7 @@ cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ;
>  $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
>         $(call if_changed_dep,dtc)
>  
> -$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
> +$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
>         $(call if_changed_dep,dtc)
>  
>  overlay-y := $(addprefix $(obj)/, $(overlay-y))
> @@ -375,6 +375,9 @@ endef
>  $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
>         $(call if_changed_rule,dtc,yaml)
>  
> +$(obj)/%.dt.yaml: $(src)/%.dtso $(DTC) $(DT_TMP_SCHEMA) FORCE
> +       $(call if_changed_rule,dtc,yaml)
> +
>  dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
>  
>  # Bzip2
>