linux-kernel - Re: [PATCH V3 2/2] scripts: dtc: Build fdtoverlay and fdtdump tools

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Message-ID: <20210113045540.s2hg2dxldsyelzkd@vireshk-i7>
Date:   Wed, 13 Jan 2021 10:25:40 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Bill Mills <bill.mills@...aro.org>, anmar.oueja@...aro.org,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [PATCH V3 2/2] scripts: dtc: Build fdtoverlay and fdtdump tools

On 12-01-21, 12:34, Frank Rowand wrote:
> On 1/11/21 11:08 PM, Viresh Kumar wrote:
> > On 11-01-21, 18:44, Frank Rowand wrote:
> >> On 1/7/21 12:25 AM, Viresh Kumar wrote:
> >>> We will start building overlays for platforms soon in the kernel and
> >>> would need these tools going forward. Lets start building them.
> >>>
> >>> The fdtoverlay program applies (or merges) one ore more overlay dtb
> >>> blobs to a base dtb blob. The kernel build system would later use
> >>> fdtoverlay to generate the overlaid blobs based on platform specific
> >>> configurations.
> >>>
> >>> The fdtdump program prints a readable version of a flat device-tree
> >>> file. This is a very useful tool to analyze the details of the overlay's
> >>> dtb and the final dtb produced by fdtoverlay after applying the
> >>> overlay's dtb to a base dtb.
> >>
> >> You can calso dump an FDT with:
> >>
> >>    dtc -O dts XXX.dtb
> >>
> >> Is this sufficient for the desired functionality, or is there something
> >> additional in fdtdump that is needed?
> > 
> 
> comment 1:
> 
> > Not for my usecase at least.

I answered this question here (and yes I could have been more clear):

"is there something additional in fdtdump that is needed?"

> 
> > 
> >> If nothing additional needed, and there is no other justification for adding
> >> another program, I would prefer to leave fdtdump out.
> > 
> 
> comment 2:
> 
> > Okay, then I will also remove the stale version of fdtdump which is
> > already there in kernel since a long time.
> > 
> 
> I'm confused.  I read comment 1 as saying that fdtdump does provide a feature
> that you need to analyze the dtb created by fdtoverlay.  But I read comment 2
> as implying that you are accepting that fdtdump will not be added to the
> Linux kernel source.

-- 
viresh