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Subject: Re: [PATCH V3 2/2] scripts: dtc: Build fdtoverlay and fdtdump tools
To:     Viresh Kumar <viresh.kumar@linaro.org>
Cc:     Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
        Rob Herring <robh+dt@kernel.org>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Bill Mills <bill.mills@linaro.org>, anmar.oueja@linaro.org,
        Masahiro Yamada <masahiroy@kernel.org>
References: <CAK7LNAQT5nVHGAZDhj4dct0v8UMzQ+-mdfBXJsfedR-7mZTnyA@mail.gmail.com>
 <72c3a4f63dde3c172c11153e9a5b19fb6cdb4498.1610000585.git.viresh.kumar@linaro.org>
 <1d9369aa-b7aa-6d06-0d44-6ef21bc639e3@gmail.com>
 <20210112050818.s6ctvd6ihd2dt2d2@vireshk-i7>
From:   Frank Rowand <frowand.list@gmail.com>
Message-ID: <3f0c733a-641f-290f-41b8-62ca22e355b7@gmail.com>
Date:   Tue, 12 Jan 2021 12:34:31 -0600
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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.

> 
>> 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.

-Frank