* [PATCH] kbuild: remove unneeded -O option to dtc
@ 2021-03-10 11:08 Masahiro Yamada
2021-03-10 14:41 ` Viresh Kumar
2021-03-10 16:54 ` Rob Herring
0 siblings, 2 replies; 3+ messages in thread
From: Masahiro Yamada @ 2021-03-10 11:08 UTC (permalink / raw)
To: linux-kbuild
Cc: devicetree, Viresh Kumar, Masahiro Yamada, Michal Marek, linux-kernel
This piece of code converts the target suffix to the dtc -O option:
*.dtb -> -O dtb
*.dt.yaml -> -O yaml
Commit ce88c9c79455 ("kbuild: Add support to build overlays (%.dtbo)")
added the third case:
*.dtbo -> -O dtbo
This works thanks to commit 163f0469bf2e ("dtc: Allow overlays to have
.dtbo extension") in the upstream DTC, which has already been pulled in
the kernel.
However, I think it is a bit odd because "dtbo" is not a format name.
At least, it does not show up in the help message of dtc.
$ scripts/dtc/dtc --help
[ snip ]
-O, --out-format <arg>
Output formats are:
dts - device tree source text
dtb - device tree blob
yaml - device tree encoded as YAML
asm - assembler source
So, I am not a big fan of the second hunk of that change:
} else if (streq(outform, "dtbo")) {
dt_to_blob(outf, dti, outversion);
Anyway, we did not need to do this in Makefile in the first place.
guess_type_by_name() had already understood ".yaml" before commit
4f0e3a57d6eb ("kbuild: Add support for DT binding schema checks"),
and now does ".dtbo" as well.
Makefile does not need to duplicate the same logic. Let's leave it
to dtc.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---
scripts/Makefile.lib | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index eee59184de64..90a4e04cd8f5 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -327,7 +327,7 @@ $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
quiet_cmd_dtc = DTC $@
cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
- $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
+ $(DTC) -o $@ -b 0 \
$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
-d $(depfile).dtc.tmp $(dtc-tmp) ; \
cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
--
2.27.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] kbuild: remove unneeded -O option to dtc
2021-03-10 11:08 [PATCH] kbuild: remove unneeded -O option to dtc Masahiro Yamada
@ 2021-03-10 14:41 ` Viresh Kumar
2021-03-10 16:54 ` Rob Herring
1 sibling, 0 replies; 3+ messages in thread
From: Viresh Kumar @ 2021-03-10 14:41 UTC (permalink / raw)
To: Masahiro Yamada, robh+dt
Cc: linux-kbuild, devicetree, Michal Marek, linux-kernel
On 10-03-21, 20:08, Masahiro Yamada wrote:
> This piece of code converts the target suffix to the dtc -O option:
>
> *.dtb -> -O dtb
> *.dt.yaml -> -O yaml
>
> Commit ce88c9c79455 ("kbuild: Add support to build overlays (%.dtbo)")
> added the third case:
>
> *.dtbo -> -O dtbo
>
> This works thanks to commit 163f0469bf2e ("dtc: Allow overlays to have
> .dtbo extension") in the upstream DTC, which has already been pulled in
> the kernel.
>
> However, I think it is a bit odd because "dtbo" is not a format name.
> At least, it does not show up in the help message of dtc.
>
> $ scripts/dtc/dtc --help
> [ snip ]
> -O, --out-format <arg>
> Output formats are:
> dts - device tree source text
> dtb - device tree blob
> yaml - device tree encoded as YAML
> asm - assembler source
>
> So, I am not a big fan of the second hunk of that change:
>
> } else if (streq(outform, "dtbo")) {
> dt_to_blob(outf, dti, outversion);
Looking at the very first version of the patch I sent,
https://lore.kernel.org/lkml/7aa70809eff3f32d821761d2a763e4fb72ecc8fb.1609844956.git.viresh.kumar@linaro.org/
this change was the only thing that was required to make it work.
I think the reason was that "outform != NULL" as -O option was passed
by the kernel.
> Anyway, we did not need to do this in Makefile in the first place.
>
> guess_type_by_name() had already understood ".yaml" before commit
> 4f0e3a57d6eb ("kbuild: Add support for DT binding schema checks"),
> and now does ".dtbo" as well.
>
> Makefile does not need to duplicate the same logic. Let's leave it
> to dtc.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
>
> scripts/Makefile.lib | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index eee59184de64..90a4e04cd8f5 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -327,7 +327,7 @@ $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
>
> quiet_cmd_dtc = DTC $@
> cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
> - $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
> + $(DTC) -o $@ -b 0 \
> $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
> -d $(depfile).dtc.tmp $(dtc-tmp) ; \
> cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
LGTM.
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
--
viresh
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] kbuild: remove unneeded -O option to dtc
2021-03-10 11:08 [PATCH] kbuild: remove unneeded -O option to dtc Masahiro Yamada
2021-03-10 14:41 ` Viresh Kumar
@ 2021-03-10 16:54 ` Rob Herring
1 sibling, 0 replies; 3+ messages in thread
From: Rob Herring @ 2021-03-10 16:54 UTC (permalink / raw)
To: Masahiro Yamada
Cc: Linux Kbuild mailing list, devicetree, Viresh Kumar,
Michal Marek, linux-kernel
On Wed, Mar 10, 2021 at 4:09 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> This piece of code converts the target suffix to the dtc -O option:
>
> *.dtb -> -O dtb
> *.dt.yaml -> -O yaml
>
> Commit ce88c9c79455 ("kbuild: Add support to build overlays (%.dtbo)")
> added the third case:
>
> *.dtbo -> -O dtbo
>
> This works thanks to commit 163f0469bf2e ("dtc: Allow overlays to have
> .dtbo extension") in the upstream DTC, which has already been pulled in
> the kernel.
>
> However, I think it is a bit odd because "dtbo" is not a format name.
> At least, it does not show up in the help message of dtc.
>
> $ scripts/dtc/dtc --help
> [ snip ]
> -O, --out-format <arg>
> Output formats are:
> dts - device tree source text
> dtb - device tree blob
> yaml - device tree encoded as YAML
> asm - assembler source
>
> So, I am not a big fan of the second hunk of that change:
>
> } else if (streq(outform, "dtbo")) {
> dt_to_blob(outf, dti, outversion);
>
> Anyway, we did not need to do this in Makefile in the first place.
>
> guess_type_by_name() had already understood ".yaml" before commit
> 4f0e3a57d6eb ("kbuild: Add support for DT binding schema checks"),
> and now does ".dtbo" as well.
>
> Makefile does not need to duplicate the same logic. Let's leave it
> to dtc.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
>
> scripts/Makefile.lib | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index eee59184de64..90a4e04cd8f5 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -327,7 +327,7 @@ $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
>
> quiet_cmd_dtc = DTC $@
> cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
> - $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
> + $(DTC) -o $@ -b 0 \
> $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
> -d $(depfile).dtc.tmp $(dtc-tmp) ; \
> cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
I think you should also drop 'yaml' from:
$(call if_changed_rule,dtc,yaml)
Though that's somewhat separate, so either way:
Acked-by: Rob Herring <robh@kernel.org>
Rob
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-03-10 11:08 [PATCH] kbuild: remove unneeded -O option to dtc Masahiro Yamada
2021-03-10 14:41 ` Viresh Kumar
2021-03-10 16:54 ` Rob Herring
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