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

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Date:   Tue, 12 Jan 2021 12:34:31 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
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 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