From: Viresh Kumar <viresh.kumar@linaro.org>
To: Masahiro Yamada <masahiroy@kernel.org>, robh+dt@kernel.org
Cc: linux-kbuild@vger.kernel.org, devicetree@vger.kernel.org,
Michal Marek <michal.lkml@markovi.net>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] kbuild: remove unneeded -O option to dtc
Date: Wed, 10 Mar 2021 20:11:21 +0530 [thread overview]
Message-ID: <20210310144121.74mawocx2ydgabx2@vireshk-i7> (raw)
In-Reply-To: <20210310110824.782209-1-masahiroy@kernel.org>
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
next prev parent reply other threads:[~2021-03-10 14:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-10 11:08 [PATCH] kbuild: remove unneeded -O option to dtc Masahiro Yamada
2021-03-10 14:41 ` Viresh Kumar [this message]
2021-03-10 16:54 ` Rob Herring
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210310144121.74mawocx2ydgabx2@vireshk-i7 \
--to=viresh.kumar@linaro.org \
--cc=devicetree@vger.kernel.org \
--cc=linux-kbuild@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=masahiroy@kernel.org \
--cc=michal.lkml@markovi.net \
--cc=robh+dt@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).