linux-kernel - Re: [PATCH] scripts/dtc: dt_to_config - report kernel config options for a devicetree

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Message-ID: <CAL_Jsq+v3r1dNY1+CK=_Atyyysq=JAFfk0q7i6YVhKS1zTZMVg@mail.gmail.com>
Date:	Sat, 30 Apr 2016 15:38:35 -0500
From:	Rob Herring <robh+dt@...nel.org>
To:	Gaurav Minocha <gaurav.minocha.os@...il.com>
Cc:	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Pavel Machek <pavel@....cz>,
	Alison Chaiken <alison_chaiken@...tor.com>
Subject: Re: [PATCH] scripts/dtc: dt_to_config - report kernel config options
 for a devicetree

On Fri, Apr 29, 2016 at 1:39 AM, Gaurav Minocha
<gaurav.minocha.os@...il.com> wrote:
> On Thu, Apr 28, 2016 at 3:32 PM, Rob Herring <robh+dt@...nel.org> wrote:
>> On Thu, Apr 28, 2016 at 4:46 PM, Frank Rowand <frowand.list@...il.com> wrote:
>>> From: Frank Rowand <frank.rowand@...sony.com>
>>>
>>> Determining which kernel config options need to be enabled for a
>>> given devicetree can be a painful process.  Create a new tool to
>>> find the drivers that may match a devicetree node compatible,
>>> find the kernel config options that enable the driver, and
>>> optionally report whether the kernel config option is enabled.
>>
>> I would find this more useful to output a config fragment with all the
>> options enabled. The hard part there is enabling the options a given
>> option is dependent on which I don't think kbuild takes care of.
>
> Do you mean to generate something like .config? If yes, then IMO it would
> not be a correct configuration file.

No, only a config fragment which is just some subset of config
options. Then you could have a generic defconfig plus the fragment for
a platform to get a working setup.

Rob